import { TransactionNotStartedError } from "../../error/TransactionNotStartedError";
import { TableColumn } from "../../schema-builder/table/TableColumn";
import { Table } from "../../schema-builder/table/Table";
import { TableIndex } from "../../schema-builder/table/TableIndex";
import { TableForeignKey } from "../../schema-builder/table/TableForeignKey";
import { View } from "../../schema-builder/view/View";
import { Query } from "../Query";
import { TableUnique } from "../../schema-builder/table/TableUnique";
import { BaseQueryRunner } from "../../query-runner/BaseQueryRunner";
import { OrmUtils } from "../../util/OrmUtils";
import { TableCheck } from "../../schema-builder/table/TableCheck";
import { TransactionAlreadyStartedError, TypeORMError } from "../../error";
import { MetadataTableType } from "../types/MetadataTableType";
import { InstanceChecker } from "../../util/InstanceChecker";
/**
 * Runs queries on a single sqlite database connection.
 */
export class AbstractSqliteQueryRunner extends BaseQueryRunner {
    // -------------------------------------------------------------------------
    // Constructor
    // -------------------------------------------------------------------------
    constructor() {
        super();
        this.transactionPromise = null;
    }
    // -------------------------------------------------------------------------
    // Public Methods
    // -------------------------------------------------------------------------
    /**
     * Creates/uses database connection from the connection pool to perform further operations.
     * Returns obtained database connection.
     */
    connect() {
        return Promise.resolve(this.driver.databaseConnection);
    }
    /**
     * Releases used database connection.
     * We just clear loaded tables and sql in memory, because sqlite do not support multiple connections thus query runners.
     */
    release() {
        this.loadedTables = [];
        this.clearSqlMemory();
        return Promise.resolve();
    }
    /**
     * Starts transaction.
     */
    async startTransaction(isolationLevel) {
        if (this.driver.transactionSupport === "none")
            throw new TypeORMError(`Transactions aren't supported by ${this.connection.driver.options.type}.`);
        if (this.isTransactionActive &&
            this.driver.transactionSupport === "simple")
            throw new TransactionAlreadyStartedError();
        if (isolationLevel &&
            isolationLevel !== "READ UNCOMMITTED" &&
            isolationLevel !== "SERIALIZABLE")
            throw new TypeORMError(`SQLite only supports SERIALIZABLE and READ UNCOMMITTED isolation`);
        this.isTransactionActive = true;
        try {
            await this.broadcaster.broadcast("BeforeTransactionStart");
        }
        catch (err) {
            this.isTransactionActive = false;
            throw err;
        }
        if (this.transactionDepth === 0) {
            if (isolationLevel) {
                if (isolationLevel === "READ UNCOMMITTED") {
                    await this.query("PRAGMA read_uncommitted = true");
                }
                else {
                    await this.query("PRAGMA read_uncommitted = false");
                }
            }
            await this.query("BEGIN TRANSACTION");
        }
        else {
            await this.query(`SAVEPOINT typeorm_${this.transactionDepth}`);
        }
        this.transactionDepth += 1;
        await this.broadcaster.broadcast("AfterTransactionStart");
    }
    /**
     * Commits transaction.
     * Error will be thrown if transaction was not started.
     */
    async commitTransaction() {
        if (!this.isTransactionActive)
            throw new TransactionNotStartedError();
        await this.broadcaster.broadcast("BeforeTransactionCommit");
        if (this.transactionDepth > 1) {
            await this.query(`RELEASE SAVEPOINT typeorm_${this.transactionDepth - 1}`);
        }
        else {
            await this.query("COMMIT");
            this.isTransactionActive = false;
        }
        this.transactionDepth -= 1;
        await this.broadcaster.broadcast("AfterTransactionCommit");
    }
    /**
     * Rollbacks transaction.
     * Error will be thrown if transaction was not started.
     */
    async rollbackTransaction() {
        if (!this.isTransactionActive)
            throw new TransactionNotStartedError();
        await this.broadcaster.broadcast("BeforeTransactionRollback");
        if (this.transactionDepth > 1) {
            await this.query(`ROLLBACK TO SAVEPOINT typeorm_${this.transactionDepth - 1}`);
        }
        else {
            await this.query("ROLLBACK");
            this.isTransactionActive = false;
        }
        this.transactionDepth -= 1;
        await this.broadcaster.broadcast("AfterTransactionRollback");
    }
    /**
     * Returns raw data stream.
     */
    stream(query, parameters, onEnd, onError) {
        throw new TypeORMError(`Stream is not supported by sqlite driver.`);
    }
    /**
     * Returns all available database names including system databases.
     */
    async getDatabases() {
        return Promise.resolve([]);
    }
    /**
     * Returns all available schema names including system schemas.
     * If database parameter specified, returns schemas of that database.
     */
    async getSchemas(database) {
        return Promise.resolve([]);
    }
    /**
     * Checks if database with the given name exist.
     */
    async hasDatabase(database) {
        return Promise.resolve(false);
    }
    /**
     * Loads currently using database
     */
    async getCurrentDatabase() {
        return Promise.resolve(undefined);
    }
    /**
     * Checks if schema with the given name exist.
     */
    async hasSchema(schema) {
        throw new TypeORMError(`This driver does not support table schemas`);
    }
    /**
     * Loads currently using database schema
     */
    async getCurrentSchema() {
        return Promise.resolve(undefined);
    }
    /**
     * Checks if table with the given name exist in the database.
     */
    async hasTable(tableOrName) {
        const tableName = InstanceChecker.isTable(tableOrName)
            ? tableOrName.name
            : tableOrName;
        const sql = `SELECT * FROM "sqlite_master" WHERE "type" = 'table' AND "name" = '${tableName}'`;
        const result = await this.query(sql);
        return result.length ? true : false;
    }
    /**
     * Checks if column with the given name exist in the given table.
     */
    async hasColumn(tableOrName, columnName) {
        const tableName = InstanceChecker.isTable(tableOrName)
            ? tableOrName.name
            : tableOrName;
        const sql = `PRAGMA table_xinfo(${this.escapePath(tableName)})`;
        const columns = await this.query(sql);
        return !!columns.find((column) => column["name"] === columnName);
    }
    /**
     * Creates a new database.
     */
    async createDatabase(database, ifNotExist) {
        return Promise.resolve();
    }
    /**
     * Drops database.
     */
    async dropDatabase(database, ifExist) {
        return Promise.resolve();
    }
    /**
     * Creates a new table schema.
     */
    async createSchema(schemaPath, ifNotExist) {
        return Promise.resolve();
    }
    /**
     * Drops table schema.
     */
    async dropSchema(schemaPath, ifExist) {
        return Promise.resolve();
    }
    /**
     * Creates a new table.
     */
    async createTable(table, ifNotExist = false, createForeignKeys = true, createIndices = true) {
        const upQueries = [];
        const downQueries = [];
        if (ifNotExist) {
            const isTableExist = await this.hasTable(table);
            if (isTableExist)
                return Promise.resolve();
        }
        upQueries.push(this.createTableSql(table, createForeignKeys));
        downQueries.push(this.dropTableSql(table));
        if (createIndices) {
            table.indices.forEach((index) => {
                // new index may be passed without name. In this case we generate index name manually.
                if (!index.name)
                    index.name = this.connection.namingStrategy.indexName(table, index.columnNames, index.where);
                upQueries.push(this.createIndexSql(table, index));
                downQueries.push(this.dropIndexSql(index));
            });
        }
        // if table have column with generated type, we must add the expression to the metadata table
        const generatedColumns = table.columns.filter((column) => column.generatedType && column.asExpression);
        for (const column of generatedColumns) {
            const insertQuery = this.insertTypeormMetadataSql({
                table: table.name,
                type: MetadataTableType.GENERATED_COLUMN,
                name: column.name,
                value: column.asExpression,
            });
            const deleteQuery = this.deleteTypeormMetadataSql({
                table: table.name,
                type: MetadataTableType.GENERATED_COLUMN,
                name: column.name,
            });
            upQueries.push(insertQuery);
            downQueries.push(deleteQuery);
        }
        await this.executeQueries(upQueries, downQueries);
    }
    /**
     * Drops the table.
     */
    async dropTable(tableOrName, ifExist, dropForeignKeys = true, dropIndices = true) {
        if (ifExist) {
            const isTableExist = await this.hasTable(tableOrName);
            if (!isTableExist)
                return Promise.resolve();
        }
        // if dropTable called with dropForeignKeys = true, we must create foreign keys in down query.
        const createForeignKeys = dropForeignKeys;
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        const upQueries = [];
        const downQueries = [];
        if (dropIndices) {
            table.indices.forEach((index) => {
                upQueries.push(this.dropIndexSql(index));
                downQueries.push(this.createIndexSql(table, index));
            });
        }
        upQueries.push(this.dropTableSql(table, ifExist));
        downQueries.push(this.createTableSql(table, createForeignKeys));
        // if table had columns with generated type, we must remove the expression from the metadata table
        const generatedColumns = table.columns.filter((column) => column.generatedType && column.asExpression);
        for (const column of generatedColumns) {
            const deleteQuery = this.deleteTypeormMetadataSql({
                table: table.name,
                type: MetadataTableType.GENERATED_COLUMN,
                name: column.name,
            });
            const insertQuery = this.insertTypeormMetadataSql({
                table: table.name,
                type: MetadataTableType.GENERATED_COLUMN,
                name: column.name,
                value: column.asExpression,
            });
            upQueries.push(deleteQuery);
            downQueries.push(insertQuery);
        }
        await this.executeQueries(upQueries, downQueries);
    }
    /**
     * Creates a new view.
     */
    async createView(view, syncWithMetadata = false) {
        const upQueries = [];
        const downQueries = [];
        upQueries.push(this.createViewSql(view));
        if (syncWithMetadata)
            upQueries.push(this.insertViewDefinitionSql(view));
        downQueries.push(this.dropViewSql(view));
        if (syncWithMetadata)
            downQueries.push(this.deleteViewDefinitionSql(view));
        await this.executeQueries(upQueries, downQueries);
    }
    /**
     * Drops the view.
     */
    async dropView(target) {
        const viewName = InstanceChecker.isView(target) ? target.name : target;
        const view = await this.getCachedView(viewName);
        const upQueries = [];
        const downQueries = [];
        upQueries.push(this.deleteViewDefinitionSql(view));
        upQueries.push(this.dropViewSql(view));
        downQueries.push(this.insertViewDefinitionSql(view));
        downQueries.push(this.createViewSql(view));
        await this.executeQueries(upQueries, downQueries);
    }
    /**
     * Renames the given table.
     */
    async renameTable(oldTableOrName, newTableName) {
        const oldTable = InstanceChecker.isTable(oldTableOrName)
            ? oldTableOrName
            : await this.getCachedTable(oldTableOrName);
        const newTable = oldTable.clone();
        newTable.name = newTableName;
        // rename table
        const up = new Query(`ALTER TABLE ${this.escapePath(oldTable.name)} RENAME TO ${this.escapePath(newTableName)}`);
        const down = new Query(`ALTER TABLE ${this.escapePath(newTableName)} RENAME TO ${this.escapePath(oldTable.name)}`);
        await this.executeQueries(up, down);
        // rename unique constraints
        newTable.uniques.forEach((unique) => {
            const oldUniqueName = this.connection.namingStrategy.uniqueConstraintName(oldTable, unique.columnNames);
            // Skip renaming if Unique has user defined constraint name
            if (unique.name !== oldUniqueName)
                return;
            unique.name = this.connection.namingStrategy.uniqueConstraintName(newTable, unique.columnNames);
        });
        // rename foreign key constraints
        newTable.foreignKeys.forEach((foreignKey) => {
            const oldForeignKeyName = this.connection.namingStrategy.foreignKeyName(oldTable, foreignKey.columnNames, this.getTablePath(foreignKey), foreignKey.referencedColumnNames);
            // Skip renaming if foreign key has user defined constraint name
            if (foreignKey.name !== oldForeignKeyName)
                return;
            foreignKey.name = this.connection.namingStrategy.foreignKeyName(newTable, foreignKey.columnNames, this.getTablePath(foreignKey), foreignKey.referencedColumnNames);
        });
        // rename indices
        newTable.indices.forEach((index) => {
            const oldIndexName = this.connection.namingStrategy.indexName(oldTable, index.columnNames, index.where);
            // Skip renaming if Index has user defined constraint name
            if (index.name !== oldIndexName)
                return;
            index.name = this.connection.namingStrategy.indexName(newTable, index.columnNames, index.where);
        });
        // rename old table;
        oldTable.name = newTable.name;
        // recreate table with new constraint names
        await this.recreateTable(newTable, oldTable);
    }
    /**
     * Creates a new column from the column in the table.
     */
    async addColumn(tableOrName, column) {
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        return this.addColumns(table, [column]);
    }
    /**
     * Creates a new columns from the column in the table.
     */
    async addColumns(tableOrName, columns) {
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        const changedTable = table.clone();
        columns.forEach((column) => changedTable.addColumn(column));
        await this.recreateTable(changedTable, table);
    }
    /**
     * Renames column in the given table.
     */
    async renameColumn(tableOrName, oldTableColumnOrName, newTableColumnOrName) {
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        const oldColumn = InstanceChecker.isTableColumn(oldTableColumnOrName)
            ? oldTableColumnOrName
            : table.columns.find((c) => c.name === oldTableColumnOrName);
        if (!oldColumn)
            throw new TypeORMError(`Column "${oldTableColumnOrName}" was not found in the "${table.name}" table.`);
        let newColumn = undefined;
        if (InstanceChecker.isTableColumn(newTableColumnOrName)) {
            newColumn = newTableColumnOrName;
        }
        else {
            newColumn = oldColumn.clone();
            newColumn.name = newTableColumnOrName;
        }
        return this.changeColumn(table, oldColumn, newColumn);
    }
    /**
     * Changes a column in the table.
     */
    async changeColumn(tableOrName, oldTableColumnOrName, newColumn) {
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        const oldColumn = InstanceChecker.isTableColumn(oldTableColumnOrName)
            ? oldTableColumnOrName
            : table.columns.find((c) => c.name === oldTableColumnOrName);
        if (!oldColumn)
            throw new TypeORMError(`Column "${oldTableColumnOrName}" was not found in the "${table.name}" table.`);
        await this.changeColumns(table, [{ oldColumn, newColumn }]);
    }
    /**
     * Changes a column in the table.
     * Changed column looses all its keys in the db.
     */
    async changeColumns(tableOrName, changedColumns) {
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        const changedTable = table.clone();
        changedColumns.forEach((changedColumnSet) => {
            if (changedColumnSet.newColumn.name !==
                changedColumnSet.oldColumn.name) {
                changedTable
                    .findColumnUniques(changedColumnSet.oldColumn)
                    .forEach((unique) => {
                    const uniqueName = this.connection.namingStrategy.uniqueConstraintName(table, unique.columnNames);
                    unique.columnNames.splice(unique.columnNames.indexOf(changedColumnSet.oldColumn.name), 1);
                    unique.columnNames.push(changedColumnSet.newColumn.name);
                    // rename Unique only if it has default constraint name
                    if (unique.name === uniqueName) {
                        unique.name =
                            this.connection.namingStrategy.uniqueConstraintName(changedTable, unique.columnNames);
                    }
                });
                changedTable
                    .findColumnForeignKeys(changedColumnSet.oldColumn)
                    .forEach((foreignKey) => {
                    const foreignKeyName = this.connection.namingStrategy.foreignKeyName(table, foreignKey.columnNames, this.getTablePath(foreignKey), foreignKey.referencedColumnNames);
                    foreignKey.columnNames.splice(foreignKey.columnNames.indexOf(changedColumnSet.oldColumn.name), 1);
                    foreignKey.columnNames.push(changedColumnSet.newColumn.name);
                    // rename FK only if it has default constraint name
                    if (foreignKey.name === foreignKeyName) {
                        foreignKey.name =
                            this.connection.namingStrategy.foreignKeyName(changedTable, foreignKey.columnNames, this.getTablePath(foreignKey), foreignKey.referencedColumnNames);
                    }
                });
                changedTable
                    .findColumnIndices(changedColumnSet.oldColumn)
                    .forEach((index) => {
                    const indexName = this.connection.namingStrategy.indexName(table, index.columnNames, index.where);
                    index.columnNames.splice(index.columnNames.indexOf(changedColumnSet.oldColumn.name), 1);
                    index.columnNames.push(changedColumnSet.newColumn.name);
                    // rename Index only if it has default constraint name
                    if (index.name === indexName) {
                        index.name =
                            this.connection.namingStrategy.indexName(changedTable, index.columnNames, index.where);
                    }
                });
            }
            const originalColumn = changedTable.columns.find((column) => column.name === changedColumnSet.oldColumn.name);
            if (originalColumn)
                changedTable.columns[changedTable.columns.indexOf(originalColumn)] = changedColumnSet.newColumn;
        });
        await this.recreateTable(changedTable, table);
    }
    /**
     * Drops column in the table.
     */
    async dropColumn(tableOrName, columnOrName) {
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        const column = InstanceChecker.isTableColumn(columnOrName)
            ? columnOrName
            : table.findColumnByName(columnOrName);
        if (!column)
            throw new TypeORMError(`Column "${columnOrName}" was not found in table "${table.name}"`);
        await this.dropColumns(table, [column]);
    }
    /**
     * Drops the columns in the table.
     */
    async dropColumns(tableOrName, columns) {
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        // clone original table and remove column and its constraints from cloned table
        const changedTable = table.clone();
        columns.forEach((column) => {
            const columnInstance = InstanceChecker.isTableColumn(column)
                ? column
                : table.findColumnByName(column);
            if (!columnInstance)
                throw new Error(`Column "${column}" was not found in table "${table.name}"`);
            changedTable.removeColumn(columnInstance);
            changedTable
                .findColumnUniques(columnInstance)
                .forEach((unique) => changedTable.removeUniqueConstraint(unique));
            changedTable
                .findColumnIndices(columnInstance)
                .forEach((index) => changedTable.removeIndex(index));
            changedTable
                .findColumnForeignKeys(columnInstance)
                .forEach((fk) => changedTable.removeForeignKey(fk));
        });
        await this.recreateTable(changedTable, table);
    }
    /**
     * Creates a new primary key.
     */
    async createPrimaryKey(tableOrName, columnNames) {
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        // clone original table and mark columns as primary
        const changedTable = table.clone();
        changedTable.columns.forEach((column) => {
            if (columnNames.find((columnName) => columnName === column.name))
                column.isPrimary = true;
        });
        await this.recreateTable(changedTable, table);
        // mark columns as primary in original table
        table.columns.forEach((column) => {
            if (columnNames.find((columnName) => columnName === column.name))
                column.isPrimary = true;
        });
    }
    /**
     * Updates composite primary keys.
     */
    async updatePrimaryKeys(tableOrName, columns) {
        await Promise.resolve();
    }
    /**
     * Drops a primary key.
     */
    async dropPrimaryKey(tableOrName) {
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        // clone original table and mark primary columns as non-primary
        const changedTable = table.clone();
        changedTable.primaryColumns.forEach((column) => {
            column.isPrimary = false;
        });
        await this.recreateTable(changedTable, table);
        // mark primary columns as non-primary in original table
        table.primaryColumns.forEach((column) => {
            column.isPrimary = false;
        });
    }
    /**
     * Creates a new unique constraint.
     */
    async createUniqueConstraint(tableOrName, uniqueConstraint) {
        await this.createUniqueConstraints(tableOrName, [uniqueConstraint]);
    }
    /**
     * Creates a new unique constraints.
     */
    async createUniqueConstraints(tableOrName, uniqueConstraints) {
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        // clone original table and add unique constraints in to cloned table
        const changedTable = table.clone();
        uniqueConstraints.forEach((uniqueConstraint) => changedTable.addUniqueConstraint(uniqueConstraint));
        await this.recreateTable(changedTable, table);
    }
    /**
     * Drops an unique constraint.
     */
    async dropUniqueConstraint(tableOrName, uniqueOrName) {
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        const uniqueConstraint = InstanceChecker.isTableUnique(uniqueOrName)
            ? uniqueOrName
            : table.uniques.find((u) => u.name === uniqueOrName);
        if (!uniqueConstraint)
            throw new TypeORMError(`Supplied unique constraint was not found in table ${table.name}`);
        await this.dropUniqueConstraints(table, [uniqueConstraint]);
    }
    /**
     * Creates an unique constraints.
     */
    async dropUniqueConstraints(tableOrName, uniqueConstraints) {
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        // clone original table and remove unique constraints from cloned table
        const changedTable = table.clone();
        uniqueConstraints.forEach((uniqueConstraint) => changedTable.removeUniqueConstraint(uniqueConstraint));
        await this.recreateTable(changedTable, table);
    }
    /**
     * Creates new check constraint.
     */
    async createCheckConstraint(tableOrName, checkConstraint) {
        await this.createCheckConstraints(tableOrName, [checkConstraint]);
    }
    /**
     * Creates new check constraints.
     */
    async createCheckConstraints(tableOrName, checkConstraints) {
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        // clone original table and add check constraints in to cloned table
        const changedTable = table.clone();
        checkConstraints.forEach((checkConstraint) => changedTable.addCheckConstraint(checkConstraint));
        await this.recreateTable(changedTable, table);
    }
    /**
     * Drops check constraint.
     */
    async dropCheckConstraint(tableOrName, checkOrName) {
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        const checkConstraint = InstanceChecker.isTableCheck(checkOrName)
            ? checkOrName
            : table.checks.find((c) => c.name === checkOrName);
        if (!checkConstraint)
            throw new TypeORMError(`Supplied check constraint was not found in table ${table.name}`);
        await this.dropCheckConstraints(table, [checkConstraint]);
    }
    /**
     * Drops check constraints.
     */
    async dropCheckConstraints(tableOrName, checkConstraints) {
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        // clone original table and remove check constraints from cloned table
        const changedTable = table.clone();
        checkConstraints.forEach((checkConstraint) => changedTable.removeCheckConstraint(checkConstraint));
        await this.recreateTable(changedTable, table);
    }
    /**
     * Creates a new exclusion constraint.
     */
    async createExclusionConstraint(tableOrName, exclusionConstraint) {
        throw new TypeORMError(`Sqlite does not support exclusion constraints.`);
    }
    /**
     * Creates a new exclusion constraints.
     */
    async createExclusionConstraints(tableOrName, exclusionConstraints) {
        throw new TypeORMError(`Sqlite does not support exclusion constraints.`);
    }
    /**
     * Drops exclusion constraint.
     */
    async dropExclusionConstraint(tableOrName, exclusionOrName) {
        throw new TypeORMError(`Sqlite does not support exclusion constraints.`);
    }
    /**
     * Drops exclusion constraints.
     */
    async dropExclusionConstraints(tableOrName, exclusionConstraints) {
        throw new TypeORMError(`Sqlite does not support exclusion constraints.`);
    }
    /**
     * Creates a new foreign key.
     */
    async createForeignKey(tableOrName, foreignKey) {
        await this.createForeignKeys(tableOrName, [foreignKey]);
    }
    /**
     * Creates a new foreign keys.
     */
    async createForeignKeys(tableOrName, foreignKeys) {
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        // clone original table and add foreign keys in to cloned table
        const changedTable = table.clone();
        foreignKeys.forEach((foreignKey) => changedTable.addForeignKey(foreignKey));
        await this.recreateTable(changedTable, table);
    }
    /**
     * Drops a foreign key from the table.
     */
    async dropForeignKey(tableOrName, foreignKeyOrName) {
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        const foreignKey = InstanceChecker.isTableForeignKey(foreignKeyOrName)
            ? foreignKeyOrName
            : table.foreignKeys.find((fk) => fk.name === foreignKeyOrName);
        if (!foreignKey)
            throw new TypeORMError(`Supplied foreign key was not found in table ${table.name}`);
        await this.dropForeignKeys(tableOrName, [foreignKey]);
    }
    /**
     * Drops a foreign keys from the table.
     */
    async dropForeignKeys(tableOrName, foreignKeys) {
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        // clone original table and remove foreign keys from cloned table
        const changedTable = table.clone();
        foreignKeys.forEach((foreignKey) => changedTable.removeForeignKey(foreignKey));
        await this.recreateTable(changedTable, table);
    }
    /**
     * Creates a new index.
     */
    async createIndex(tableOrName, index) {
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        // new index may be passed without name. In this case we generate index name manually.
        if (!index.name)
            index.name = this.generateIndexName(table, index);
        const up = this.createIndexSql(table, index);
        const down = this.dropIndexSql(index);
        await this.executeQueries(up, down);
        table.addIndex(index);
    }
    /**
     * Creates a new indices
     */
    async createIndices(tableOrName, indices) {
        const promises = indices.map((index) => this.createIndex(tableOrName, index));
        await Promise.all(promises);
    }
    /**
     * Drops an index from the table.
     */
    async dropIndex(tableOrName, indexOrName) {
        const table = InstanceChecker.isTable(tableOrName)
            ? tableOrName
            : await this.getCachedTable(tableOrName);
        const index = InstanceChecker.isTableIndex(indexOrName)
            ? indexOrName
            : table.indices.find((i) => i.name === indexOrName);
        if (!index)
            throw new TypeORMError(`Supplied index ${indexOrName} was not found in table ${table.name}`);
        // old index may be passed without name. In this case we generate index name manually.
        if (!index.name)
            index.name = this.generateIndexName(table, index);
        const up = this.dropIndexSql(index);
        const down = this.createIndexSql(table, index);
        await this.executeQueries(up, down);
        table.removeIndex(index);
    }
    /**
     * Drops an indices from the table.
     */
    async dropIndices(tableOrName, indices) {
        const promises = indices.map((index) => this.dropIndex(tableOrName, index));
        await Promise.all(promises);
    }
    /**
     * Clears all table contents.
     * Note: this operation uses SQL's TRUNCATE query which cannot be reverted in transactions.
     */
    async clearTable(tableName) {
        await this.query(`DELETE FROM ${this.escapePath(tableName)}`);
    }
    /**
     * Removes all tables from the currently connected database.
     */
    async clearDatabase(database) {
        let dbPath = undefined;
        if (database &&
            this.driver.getAttachedDatabaseHandleByRelativePath(database)) {
            dbPath =
                this.driver.getAttachedDatabaseHandleByRelativePath(database);
        }
        await this.query(`PRAGMA foreign_keys = OFF`);
        const isAnotherTransactionActive = this.isTransactionActive;
        if (!isAnotherTransactionActive)
            await this.startTransaction();
        try {
            const selectViewDropsQuery = dbPath
                ? `SELECT 'DROP VIEW "${dbPath}"."' || name || '";' as query FROM "${dbPath}"."sqlite_master" WHERE "type" = 'view'`
                : `SELECT 'DROP VIEW "' || name || '";' as query FROM "sqlite_master" WHERE "type" = 'view'`;
            const dropViewQueries = await this.query(selectViewDropsQuery);
            await Promise.all(dropViewQueries.map((q) => this.query(q["query"])));
            const selectTableDropsQuery = dbPath
                ? `SELECT 'DROP TABLE "${dbPath}"."' || name || '";' as query FROM "${dbPath}"."sqlite_master" WHERE "type" = 'table' AND "name" != 'sqlite_sequence'`
                : `SELECT 'DROP TABLE "' || name || '";' as query FROM "sqlite_master" WHERE "type" = 'table' AND "name" != 'sqlite_sequence'`;
            const dropTableQueries = await this.query(selectTableDropsQuery);
            await Promise.all(dropTableQueries.map((q) => this.query(q["query"])));
            if (!isAnotherTransactionActive)
                await this.commitTransaction();
        }
        catch (error) {
            try {
                // we throw original error even if rollback thrown an error
                if (!isAnotherTransactionActive)
                    await this.rollbackTransaction();
            }
            catch (rollbackError) { }
            throw error;
        }
        finally {
            await this.query(`PRAGMA foreign_keys = ON`);
        }
    }
    // -------------------------------------------------------------------------
    // Protected Methods
    // -------------------------------------------------------------------------
    async loadViews(viewNames) {
        const hasTable = await this.hasTable(this.getTypeormMetadataTableName());
        if (!hasTable) {
            return [];
        }
        if (!viewNames) {
            viewNames = [];
        }
        const viewNamesString = viewNames
            .map((name) => "'" + name + "'")
            .join(", ");
        let query = `SELECT "t".* FROM "${this.getTypeormMetadataTableName()}" "t" INNER JOIN "sqlite_master" s ON "s"."name" = "t"."name" AND "s"."type" = 'view' WHERE "t"."type" = '${MetadataTableType.VIEW}'`;
        if (viewNamesString.length > 0)
            query += ` AND "t"."name" IN (${viewNamesString})`;
        const dbViews = await this.query(query);
        return dbViews.map((dbView) => {
            const view = new View();
            view.name = dbView["name"];
            view.expression = dbView["value"];
            return view;
        });
    }
    async loadTableRecords(tablePath, tableOrIndex) {
        let database = undefined;
        const [schema, tableName] = this.splitTablePath(tablePath);
        if (schema &&
            this.driver.getAttachedDatabasePathRelativeByHandle(schema)) {
            database =
                this.driver.getAttachedDatabasePathRelativeByHandle(schema);
        }
        return this.query(`SELECT ${database ? `'${database}'` : null} as database, ${schema ? `'${schema}'` : null} as schema, * FROM ${schema ? `"${schema}".` : ""}${this.escapePath(`sqlite_master`)} WHERE "type" = '${tableOrIndex}' AND "${tableOrIndex === "table" ? "name" : "tbl_name"}" IN ('${tableName}')`);
    }
    async loadPragmaRecords(tablePath, pragma) {
        const [, tableName] = this.splitTablePath(tablePath);
        return this.query(`PRAGMA ${pragma}("${tableName}")`);
    }
    /**
     * Loads all tables (with given names) from the database and creates a Table from them.
     */
    async loadTables(tableNames) {
        // if no tables given then no need to proceed
        if (tableNames && tableNames.length === 0) {
            return [];
        }
        let dbTables = [];
        let dbIndicesDef;
        if (!tableNames) {
            const tablesSql = `SELECT * FROM "sqlite_master" WHERE "type" = 'table'`;
            dbTables.push(...(await this.query(tablesSql)));
            const tableNamesString = dbTables
                .map(({ name }) => `'${name}'`)
                .join(", ");
            dbIndicesDef = await this.query(`SELECT * FROM "sqlite_master" WHERE "type" = 'index' AND "tbl_name" IN (${tableNamesString})`);
        }
        else {
            const tableNamesWithoutDot = tableNames
                .filter((tableName) => {
                return tableName.split(".").length === 1;
            })
                .map((tableName) => `'${tableName}'`);
            const tableNamesWithDot = tableNames.filter((tableName) => {
                return tableName.split(".").length > 1;
            });
            const queryPromises = (type) => {
                const promises = [
                    ...tableNamesWithDot.map((tableName) => this.loadTableRecords(tableName, type)),
                ];
                if (tableNamesWithoutDot.length) {
                    promises.push(this.query(`SELECT * FROM "sqlite_master" WHERE "type" = '${type}' AND "${type === "table" ? "name" : "tbl_name"}" IN (${tableNamesWithoutDot})`));
                }
                return promises;
            };
            dbTables = (await Promise.all(queryPromises("table")))
                .reduce((acc, res) => [...acc, ...res], [])
                .filter(Boolean);
            dbIndicesDef = (await Promise.all(queryPromises("index")))
                .reduce((acc, res) => [...acc, ...res], [])
                .filter(Boolean);
        }
        // if tables were not found in the db, no need to proceed
        if (dbTables.length === 0) {
            return [];
        }
        // create table schemas for loaded tables
        return Promise.all(dbTables.map(async (dbTable) => {
            const tablePath = dbTable["database"] &&
                this.driver.getAttachedDatabaseHandleByRelativePath(dbTable["database"])
                ? `${this.driver.getAttachedDatabaseHandleByRelativePath(dbTable["database"])}.${dbTable["name"]}`
                : dbTable["name"];
            const sql = dbTable["sql"];
            const withoutRowid = sql.includes("WITHOUT ROWID");
            const table = new Table({ name: tablePath, withoutRowid });
            // load columns and indices
            const [dbColumns, dbIndices, dbForeignKeys] = await Promise.all([
                this.loadPragmaRecords(tablePath, `table_xinfo`),
                this.loadPragmaRecords(tablePath, `index_list`),
                this.loadPragmaRecords(tablePath, `foreign_key_list`),
            ]);
            // find column name with auto increment
            let autoIncrementColumnName = undefined;
            const tableSql = dbTable["sql"];
            let autoIncrementIndex = tableSql
                .toUpperCase()
                .indexOf("AUTOINCREMENT");
            if (autoIncrementIndex !== -1) {
                autoIncrementColumnName = tableSql.substr(0, autoIncrementIndex);
                const comma = autoIncrementColumnName.lastIndexOf(",");
                const bracket = autoIncrementColumnName.lastIndexOf("(");
                if (comma !== -1) {
                    autoIncrementColumnName =
                        autoIncrementColumnName.substr(comma);
                    autoIncrementColumnName =
                        autoIncrementColumnName.substr(0, autoIncrementColumnName.lastIndexOf('"'));
                    autoIncrementColumnName =
                        autoIncrementColumnName.substr(autoIncrementColumnName.indexOf('"') + 1);
                }
                else if (bracket !== -1) {
                    autoIncrementColumnName =
                        autoIncrementColumnName.substr(bracket);
                    autoIncrementColumnName =
                        autoIncrementColumnName.substr(0, autoIncrementColumnName.lastIndexOf('"'));
                    autoIncrementColumnName =
                        autoIncrementColumnName.substr(autoIncrementColumnName.indexOf('"') + 1);
                }
            }
            // create columns from the loaded columns
            table.columns = await Promise.all(dbColumns.map(async (dbColumn) => {
                const tableColumn = new TableColumn();
                tableColumn.name = dbColumn["name"];
                tableColumn.type = dbColumn["type"].toLowerCase();
                tableColumn.default =
                    dbColumn["dflt_value"] !== null &&
                        dbColumn["dflt_value"] !== undefined
                        ? dbColumn["dflt_value"]
                        : undefined;
                tableColumn.isNullable = dbColumn["notnull"] === 0;
                // primary keys are numbered starting with 1, columns that aren't primary keys are marked with 0
                tableColumn.isPrimary = dbColumn["pk"] > 0;
                tableColumn.comment = ""; // SQLite does not support column comments
                tableColumn.isGenerated =
                    autoIncrementColumnName === dbColumn["name"];
                if (tableColumn.isGenerated) {
                    tableColumn.generationStrategy = "increment";
                }
                if (dbColumn["hidden"] === 2 ||
                    dbColumn["hidden"] === 3) {
                    tableColumn.generatedType =
                        dbColumn["hidden"] === 2 ? "VIRTUAL" : "STORED";
                    const asExpressionQuery = await this.selectTypeormMetadataSql({
                        table: table.name,
                        type: MetadataTableType.GENERATED_COLUMN,
                        name: tableColumn.name,
                    });
                    const results = await this.query(asExpressionQuery.query, asExpressionQuery.parameters);
                    if (results[0] && results[0].value) {
                        tableColumn.asExpression = results[0].value;
                    }
                    else {
                        tableColumn.asExpression = "";
                    }
                }
                if (tableColumn.type === "varchar") {
                    // Check if this is an enum
                    const enumMatch = sql.match(new RegExp('"(' +
                        tableColumn.name +
                        ")\" varchar CHECK\\s*\\(\\s*\"\\1\"\\s+IN\\s*\\(('[^']+'(?:\\s*,\\s*'[^']+')+)\\s*\\)\\s*\\)"));
                    if (enumMatch) {
                        // This is an enum
                        tableColumn.enum = enumMatch[2]
                            .substr(1, enumMatch[2].length - 2)
                            .split("','");
                    }
                }
                // parse datatype and attempt to retrieve length, precision and scale
                let pos = tableColumn.type.indexOf("(");
                if (pos !== -1) {
                    const fullType = tableColumn.type;
                    let dataType = fullType.substr(0, pos);
                    if (!!this.driver.withLengthColumnTypes.find((col) => col === dataType)) {
                        let len = parseInt(fullType.substring(pos + 1, fullType.length - 1));
                        if (len) {
                            tableColumn.length = len.toString();
                            tableColumn.type = dataType; // remove the length part from the datatype
                        }
                    }
                    if (!!this.driver.withPrecisionColumnTypes.find((col) => col === dataType)) {
                        const re = new RegExp(`^${dataType}\\((\\d+),?\\s?(\\d+)?\\)`);
                        const matches = fullType.match(re);
                        if (matches && matches[1]) {
                            tableColumn.precision = +matches[1];
                        }
                        if (!!this.driver.withScaleColumnTypes.find((col) => col === dataType)) {
                            if (matches && matches[2]) {
                                tableColumn.scale = +matches[2];
                            }
                        }
                        tableColumn.type = dataType; // remove the precision/scale part from the datatype
                    }
                }
                return tableColumn;
            }));
            // find foreign key constraints from CREATE TABLE sql
            let fkResult;
            const fkMappings = [];
            const fkRegex = /CONSTRAINT "([^"]*)" FOREIGN KEY ?\((.*?)\) REFERENCES "([^"]*)"/g;
            while ((fkResult = fkRegex.exec(sql)) !== null) {
                fkMappings.push({
                    name: fkResult[1],
                    columns: fkResult[2]
                        .substr(1, fkResult[2].length - 2)
                        .split(`", "`),
                    referencedTableName: fkResult[3],
                });
            }
            // build foreign keys
            const tableForeignKeyConstraints = OrmUtils.uniq(dbForeignKeys, (dbForeignKey) => dbForeignKey["id"]);
            table.foreignKeys = tableForeignKeyConstraints.map((foreignKey) => {
                const ownForeignKeys = dbForeignKeys.filter((dbForeignKey) => dbForeignKey["id"] === foreignKey["id"] &&
                    dbForeignKey["table"] === foreignKey["table"]);
                const columnNames = ownForeignKeys.map((dbForeignKey) => dbForeignKey["from"]);
                const referencedColumnNames = ownForeignKeys.map((dbForeignKey) => dbForeignKey["to"]);
                // find related foreign key mapping
                const fkMapping = fkMappings.find((it) => it.referencedTableName ===
                    foreignKey["table"] &&
                    it.columns.every((column) => columnNames.indexOf(column) !== -1));
                return new TableForeignKey({
                    name: fkMapping.name,
                    columnNames: columnNames,
                    referencedTableName: foreignKey["table"],
                    referencedColumnNames: referencedColumnNames,
                    onDelete: foreignKey["on_delete"],
                    onUpdate: foreignKey["on_update"],
                });
            });
            // find unique constraints from CREATE TABLE sql
            let uniqueRegexResult;
            const uniqueMappings = [];
            const uniqueRegex = /CONSTRAINT "([^"]*)" UNIQUE ?\((.*?)\)/g;
            while ((uniqueRegexResult = uniqueRegex.exec(sql)) !== null) {
                uniqueMappings.push({
                    name: uniqueRegexResult[1],
                    columns: uniqueRegexResult[2]
                        .substr(1, uniqueRegexResult[2].length - 2)
                        .split(`", "`),
                });
            }
            // build unique constraints
            const tableUniquePromises = dbIndices
                .filter((dbIndex) => dbIndex["origin"] === "u")
                .map((dbIndex) => dbIndex["name"])
                .filter((value, index, self) => self.indexOf(value) === index)
                .map(async (dbIndexName) => {
                const dbIndex = dbIndices.find((dbIndex) => dbIndex["name"] === dbIndexName);
                const indexInfos = await this.query(`PRAGMA index_info("${dbIndex["name"]}")`);
                const indexColumns = indexInfos
                    .sort((indexInfo1, indexInfo2) => parseInt(indexInfo1["seqno"]) -
                    parseInt(indexInfo2["seqno"]))
                    .map((indexInfo) => indexInfo["name"]);
                if (indexColumns.length === 1) {
                    const column = table.columns.find((column) => {
                        return !!indexColumns.find((indexColumn) => indexColumn === column.name);
                    });
                    if (column)
                        column.isUnique = true;
                }
                // find existent mapping by a column names
                const foundMapping = uniqueMappings.find((mapping) => {
                    return mapping.columns.every((column) => indexColumns.indexOf(column) !== -1);
                });
                return new TableUnique({
                    name: foundMapping
                        ? foundMapping.name
                        : this.connection.namingStrategy.uniqueConstraintName(table, indexColumns),
                    columnNames: indexColumns,
                });
            });
            table.uniques = (await Promise.all(tableUniquePromises));
            // build checks
            let result;
            const regexp = /CONSTRAINT "([^"]*)" CHECK ?(\(.*?\))([,]|[)]$)/g;
            while ((result = regexp.exec(sql)) !== null) {
                table.checks.push(new TableCheck({
                    name: result[1],
                    expression: result[2],
                }));
            }
            // build indices
            const indicesPromises = dbIndices
                .filter((dbIndex) => dbIndex["origin"] === "c")
                .map((dbIndex) => dbIndex["name"])
                .filter((value, index, self) => self.indexOf(value) === index) // unqiue
                .map(async (dbIndexName) => {
                const indexDef = dbIndicesDef.find((dbIndexDef) => dbIndexDef["name"] === dbIndexName);
                const condition = /WHERE (.*)/.exec(indexDef["sql"]);
                const dbIndex = dbIndices.find((dbIndex) => dbIndex["name"] === dbIndexName);
                const indexInfos = await this.query(`PRAGMA index_info("${dbIndex["name"]}")`);
                const indexColumns = indexInfos
                    .sort((indexInfo1, indexInfo2) => parseInt(indexInfo1["seqno"]) -
                    parseInt(indexInfo2["seqno"]))
                    .map((indexInfo) => indexInfo["name"]);
                const dbIndexPath = `${dbTable["database"] ? `${dbTable["database"]}.` : ""}${dbIndex["name"]}`;
                const isUnique = dbIndex["unique"] === "1" ||
                    dbIndex["unique"] === 1;
                return new TableIndex({
                    table: table,
                    name: dbIndexPath,
                    columnNames: indexColumns,
                    isUnique: isUnique,
                    where: condition ? condition[1] : undefined,
                });
            });
            const indices = await Promise.all(indicesPromises);
            table.indices = indices.filter((index) => !!index);
            return table;
        }));
    }
    /**
     * Builds create table sql.
     */
    createTableSql(table, createForeignKeys, temporaryTable) {
        const primaryColumns = table.columns.filter((column) => column.isPrimary);
        const hasAutoIncrement = primaryColumns.find((column) => column.isGenerated && column.generationStrategy === "increment");
        const skipPrimary = primaryColumns.length > 1;
        if (skipPrimary && hasAutoIncrement)
            throw new TypeORMError(`Sqlite does not support AUTOINCREMENT on composite primary key`);
        const columnDefinitions = table.columns
            .map((column) => this.buildCreateColumnSql(column, skipPrimary))
            .join(", ");
        const [database] = this.splitTablePath(table.name);
        let sql = `CREATE TABLE ${this.escapePath(table.name)} (${columnDefinitions}`;
        let [databaseNew, tableName] = this.splitTablePath(table.name);
        const newTableName = temporaryTable
            ? `${databaseNew ? `${databaseNew}.` : ""}${tableName.replace(/^temporary_/, "")}`
            : table.name;
        // need for `addColumn()` method, because it recreates table.
        table.columns
            .filter((column) => column.isUnique)
            .forEach((column) => {
            const isUniqueExist = table.uniques.some((unique) => unique.columnNames.length === 1 &&
                unique.columnNames[0] === column.name);
            if (!isUniqueExist)
                table.uniques.push(new TableUnique({
                    name: this.connection.namingStrategy.uniqueConstraintName(table, [column.name]),
                    columnNames: [column.name],
                }));
        });
        if (table.uniques.length > 0) {
            const uniquesSql = table.uniques
                .map((unique) => {
                const uniqueName = unique.name
                    ? unique.name
                    : this.connection.namingStrategy.uniqueConstraintName(newTableName, unique.columnNames);
                const columnNames = unique.columnNames
                    .map((columnName) => `"${columnName}"`)
                    .join(", ");
                return `CONSTRAINT "${uniqueName}" UNIQUE (${columnNames})`;
            })
                .join(", ");
            sql += `, ${uniquesSql}`;
        }
        if (table.checks.length > 0) {
            const checksSql = table.checks
                .map((check) => {
                const checkName = check.name
                    ? check.name
                    : this.connection.namingStrategy.checkConstraintName(newTableName, check.expression);
                return `CONSTRAINT "${checkName}" CHECK (${check.expression})`;
            })
                .join(", ");
            sql += `, ${checksSql}`;
        }
        if (table.foreignKeys.length > 0 && createForeignKeys) {
            const foreignKeysSql = table.foreignKeys
                .filter((fk) => {
                const [referencedDatabase] = this.splitTablePath(fk.referencedTableName);
                if (referencedDatabase !== database) {
                    return false;
                }
                return true;
            })
                .map((fk) => {
                const [, referencedTable] = this.splitTablePath(fk.referencedTableName);
                const columnNames = fk.columnNames
                    .map((columnName) => `"${columnName}"`)
                    .join(", ");
                if (!fk.name)
                    fk.name = this.connection.namingStrategy.foreignKeyName(newTableName, fk.columnNames, this.getTablePath(fk), fk.referencedColumnNames);
                const referencedColumnNames = fk.referencedColumnNames
                    .map((columnName) => `"${columnName}"`)
                    .join(", ");
                let constraint = `CONSTRAINT "${fk.name}" FOREIGN KEY (${columnNames}) REFERENCES "${referencedTable}" (${referencedColumnNames})`;
                if (fk.onDelete)
                    constraint += ` ON DELETE ${fk.onDelete}`;
                if (fk.onUpdate)
                    constraint += ` ON UPDATE ${fk.onUpdate}`;
                if (fk.deferrable)
                    constraint += ` DEFERRABLE ${fk.deferrable}`;
                return constraint;
            })
                .join(", ");
            sql += `, ${foreignKeysSql}`;
        }
        if (primaryColumns.length > 1) {
            const columnNames = primaryColumns
                .map((column) => `"${column.name}"`)
                .join(", ");
            sql += `, PRIMARY KEY (${columnNames})`;
        }
        sql += `)`;
        if (table.withoutRowid) {
            sql += " WITHOUT ROWID";
        }
        return new Query(sql);
    }
    /**
     * Builds drop table sql.
     */
    dropTableSql(tableOrName, ifExist) {
        const tableName = InstanceChecker.isTable(tableOrName)
            ? tableOrName.name
            : tableOrName;
        const query = ifExist
            ? `DROP TABLE IF EXISTS ${this.escapePath(tableName)}`
            : `DROP TABLE ${this.escapePath(tableName)}`;
        return new Query(query);
    }
    createViewSql(view) {
        if (typeof view.expression === "string") {
            return new Query(`CREATE VIEW "${view.name}" AS ${view.expression}`);
        }
        else {
            return new Query(`CREATE VIEW "${view.name}" AS ${view
                .expression(this.connection)
                .getQuery()}`);
        }
    }
    insertViewDefinitionSql(view) {
        const expression = typeof view.expression === "string"
            ? view.expression.trim()
            : view.expression(this.connection).getQuery();
        return this.insertTypeormMetadataSql({
            type: MetadataTableType.VIEW,
            name: view.name,
            value: expression,
        });
    }
    /**
     * Builds drop view sql.
     */
    dropViewSql(viewOrPath) {
        const viewName = InstanceChecker.isView(viewOrPath)
            ? viewOrPath.name
            : viewOrPath;
        return new Query(`DROP VIEW "${viewName}"`);
    }
    /**
     * Builds remove view sql.
     */
    deleteViewDefinitionSql(viewOrPath) {
        const viewName = InstanceChecker.isView(viewOrPath)
            ? viewOrPath.name
            : viewOrPath;
        return this.deleteTypeormMetadataSql({
            type: MetadataTableType.VIEW,
            name: viewName,
        });
    }
    /**
     * Builds create index sql.
     */
    createIndexSql(table, index) {
        const columns = index.columnNames
            .map((columnName) => `"${columnName}"`)
            .join(", ");
        const [database, tableName] = this.splitTablePath(table.name);
        return new Query(`CREATE ${index.isUnique ? "UNIQUE " : ""}INDEX ${database ? `"${database}".` : ""}${this.escapePath(index.name)} ON "${tableName}" (${columns}) ${index.where ? "WHERE " + index.where : ""}`);
    }
    /**
     * Builds drop index sql.
     */
    dropIndexSql(indexOrName) {
        let indexName = InstanceChecker.isTableIndex(indexOrName)
            ? indexOrName.name
            : indexOrName;
        return new Query(`DROP INDEX ${this.escapePath(indexName)}`);
    }
    /**
     * Builds a query for create column.
     */
    buildCreateColumnSql(column, skipPrimary) {
        let c = '"' + column.name + '"';
        if (InstanceChecker.isColumnMetadata(column)) {
            c += " " + this.driver.normalizeType(column);
        }
        else {
            c += " " + this.connection.driver.createFullType(column);
        }
        if (column.enum)
            c +=
                ' CHECK( "' +
                    column.name +
                    '" IN (' +
                    column.enum.map((val) => "'" + val + "'").join(",") +
                    ") )";
        if (column.isPrimary && !skipPrimary)
            c += " PRIMARY KEY";
        if (column.isGenerated === true &&
            column.generationStrategy === "increment")
            // don't use skipPrimary here since updates can update already exist primary without auto inc.
            c += " AUTOINCREMENT";
        if (column.collation)
            c += " COLLATE " + column.collation;
        if (column.isNullable !== true)
            c += " NOT NULL";
        if (column.asExpression) {
            c += ` AS (${column.asExpression}) ${column.generatedType ? column.generatedType : "VIRTUAL"}`;
        }
        else {
            if (column.default !== undefined && column.default !== null)
                c += " DEFAULT (" + column.default + ")";
        }
        return c;
    }
    async recreateTable(newTable, oldTable, migrateData = true) {
        const upQueries = [];
        const downQueries = [];
        // drop old table indices
        oldTable.indices.forEach((index) => {
            upQueries.push(this.dropIndexSql(index));
            downQueries.push(this.createIndexSql(oldTable, index));
        });
        // change table name into 'temporary_table'
        let [databaseNew, tableNameNew] = this.splitTablePath(newTable.name);
        let [, tableNameOld] = this.splitTablePath(oldTable.name);
        newTable.name = tableNameNew = `${databaseNew ? `${databaseNew}.` : ""}temporary_${tableNameNew}`;
        // create new table
        upQueries.push(this.createTableSql(newTable, true, true));
        downQueries.push(this.dropTableSql(newTable));
        // migrate all data from the old table into new table
        if (migrateData) {
            let newColumnNames = newTable.columns
                .filter((column) => !column.generatedType)
                .map((column) => `"${column.name}"`);
            let oldColumnNames = oldTable.columns
                .filter((column) => !column.generatedType)
                .map((column) => `"${column.name}"`);
            if (oldColumnNames.length < newColumnNames.length) {
                newColumnNames = newTable.columns
                    .filter((column) => {
                    const oldColumn = oldTable.columns.find((c) => c.name === column.name);
                    if (oldColumn && oldColumn.generatedType)
                        return false;
                    return !column.generatedType && oldColumn;
                })
                    .map((column) => `"${column.name}"`);
            }
            else if (oldColumnNames.length > newColumnNames.length) {
                oldColumnNames = oldTable.columns
                    .filter((column) => {
                    return (!column.generatedType &&
                        newTable.columns.find((c) => c.name === column.name));
                })
                    .map((column) => `"${column.name}"`);
            }
            upQueries.push(new Query(`INSERT INTO ${this.escapePath(newTable.name)}(${newColumnNames.join(", ")}) SELECT ${oldColumnNames.join(", ")} FROM ${this.escapePath(oldTable.name)}`));
            downQueries.push(new Query(`INSERT INTO ${this.escapePath(oldTable.name)}(${oldColumnNames.join(", ")}) SELECT ${newColumnNames.join(", ")} FROM ${this.escapePath(newTable.name)}`));
        }
        // drop old table
        upQueries.push(this.dropTableSql(oldTable));
        downQueries.push(this.createTableSql(oldTable, true));
        // rename old table
        upQueries.push(new Query(`ALTER TABLE ${this.escapePath(newTable.name)} RENAME TO ${this.escapePath(tableNameOld)}`));
        downQueries.push(new Query(`ALTER TABLE ${this.escapePath(oldTable.name)} RENAME TO ${this.escapePath(tableNameNew)}`));
        newTable.name = oldTable.name;
        // recreate table indices
        newTable.indices.forEach((index) => {
            // new index may be passed without name. In this case we generate index name manually.
            if (!index.name)
                index.name = this.connection.namingStrategy.indexName(newTable, index.columnNames, index.where);
            upQueries.push(this.createIndexSql(newTable, index));
            downQueries.push(this.dropIndexSql(index));
        });
        // update generated columns in "typeorm_metadata" table
        // Step 1: clear data for removed generated columns
        oldTable.columns
            .filter((column) => {
            const newTableColumn = newTable.columns.find((c) => c.name === column.name);
            // we should delete record from "typeorm_metadata" if generated column was removed
            // or it was changed to non-generated
            return (column.generatedType &&
                column.asExpression &&
                (!newTableColumn ||
                    (!newTableColumn.generatedType &&
                        !newTableColumn.asExpression)));
        })
            .forEach((column) => {
            const deleteQuery = this.deleteTypeormMetadataSql({
                table: oldTable.name,
                type: MetadataTableType.GENERATED_COLUMN,
                name: column.name,
            });
            const insertQuery = this.insertTypeormMetadataSql({
                table: oldTable.name,
                type: MetadataTableType.GENERATED_COLUMN,
                name: column.name,
                value: column.asExpression,
            });
            upQueries.push(deleteQuery);
            downQueries.push(insertQuery);
        });
        // Step 2: add data for new generated columns
        newTable.columns
            .filter((column) => column.generatedType &&
            column.asExpression &&
            !oldTable.columns.some((c) => c.name === column.name))
            .forEach((column) => {
            const insertQuery = this.insertTypeormMetadataSql({
                table: newTable.name,
                type: MetadataTableType.GENERATED_COLUMN,
                name: column.name,
                value: column.asExpression,
            });
            const deleteQuery = this.deleteTypeormMetadataSql({
                table: newTable.name,
                type: MetadataTableType.GENERATED_COLUMN,
                name: column.name,
            });
            upQueries.push(insertQuery);
            downQueries.push(deleteQuery);
        });
        // Step 3: update changed expressions
        newTable.columns
            .filter((column) => column.generatedType && column.asExpression)
            .forEach((column) => {
            const oldColumn = oldTable.columns.find((c) => c.name === column.name &&
                c.generatedType &&
                column.generatedType &&
                c.asExpression !== column.asExpression);
            if (!oldColumn)
                return;
            // update expression
            const deleteQuery = this.deleteTypeormMetadataSql({
                table: oldTable.name,
                type: MetadataTableType.GENERATED_COLUMN,
                name: oldColumn.name,
            });
            const insertQuery = this.insertTypeormMetadataSql({
                table: newTable.name,
                type: MetadataTableType.GENERATED_COLUMN,
                name: column.name,
                value: column.asExpression,
            });
            upQueries.push(deleteQuery);
            upQueries.push(insertQuery);
            // revert update
            const revertInsertQuery = this.insertTypeormMetadataSql({
                table: newTable.name,
                type: MetadataTableType.GENERATED_COLUMN,
                name: oldColumn.name,
                value: oldColumn.asExpression,
            });
            const revertDeleteQuery = this.deleteTypeormMetadataSql({
                table: oldTable.name,
                type: MetadataTableType.GENERATED_COLUMN,
                name: column.name,
            });
            downQueries.push(revertInsertQuery);
            downQueries.push(revertDeleteQuery);
        });
        await this.executeQueries(upQueries, downQueries);
        this.replaceCachedTable(oldTable, newTable);
    }
    /**
     * tablePath e.g. "myDB.myTable", "myTable"
     */
    splitTablePath(tablePath) {
        return (tablePath.indexOf(".") !== -1
            ? tablePath.split(".")
            : [undefined, tablePath]);
    }
    /**
     * Escapes given table or view path. Tolerates leading/trailing dots
     */
    escapePath(target, disableEscape) {
        const tableName = InstanceChecker.isTable(target) || InstanceChecker.isView(target)
            ? target.name
            : target;
        return tableName
            .replace(/^\.+|\.+$/g, "")
            .split(".")
            .map((i) => (disableEscape ? i : `"${i}"`))
            .join(".");
    }
}

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