/**
 * @fileoverview Rule to flag wrapping non-iife in parens
 * @author Gyandeep Singh
 * @copyright 2015 Gyandeep Singh. All rights reserved.
 */

"use strict";

//------------------------------------------------------------------------------
// Helpers
//------------------------------------------------------------------------------

/**
 * Checks whether or not a given node is an `Identifier` node which was named a given name.
 * @param {ASTNode} node - A node to check.
 * @param {string} name - An expected name of the node.
 * @returns {boolean} `true` if the node is an `Identifier` node which was named as expected.
 */
function isIdentifier(node, name) {
    return node.type === "Identifier" && node.name === name;
}

/**
 * Checks whether or not a given node is an argument of a specified method call.
 * @param {ASTNode} node - A node to check.
 * @param {number} index - An expected index of the node in arguments.
 * @param {string} object - An expected name of the object of the method.
 * @param {string} property - An expected name of the method.
 * @returns {boolean} `true` if the node is an argument of the specified method call.
 */
function isArgumentOfMethodCall(node, index, object, property) {
    var parent = node.parent;
    return (
        parent.type === "CallExpression" &&
        parent.callee.type === "MemberExpression" &&
        parent.callee.computed === false &&
        isIdentifier(parent.callee.object, object) &&
        isIdentifier(parent.callee.property, property) &&
        parent.arguments[index] === node
    );
}

/**
 * Checks whether or not a given node is a property descriptor.
 * @param {ASTNode} node - A node to check.
 * @returns {boolean} `true` if the node is a property descriptor.
 */
function isPropertyDescriptor(node) {
    // Object.defineProperty(obj, "foo", {set: ...})
    if (isArgumentOfMethodCall(node, 2, "Object", "defineProperty") ||
        isArgumentOfMethodCall(node, 2, "Reflect", "defineProperty")
    ) {
        return true;
    }

    // Object.defineProperties(obj, {foo: {set: ...}})
    // Object.create(proto, {foo: {set: ...}})
    node = node.parent.parent;
    return node.type === "ObjectExpression" && (
        isArgumentOfMethodCall(node, 1, "Object", "create") ||
        isArgumentOfMethodCall(node, 1, "Object", "defineProperties")
    );
}

//------------------------------------------------------------------------------
// Rule Definition
//------------------------------------------------------------------------------

module.exports = function(context) {
    var config = context.options[0] || {};
    var checkGetWithoutSet = config.getWithoutSet === true;
    var checkSetWithoutGet = config.setWithoutGet !== false;

    /**
     * Checks a object expression to see if it has setter and getter both present or none.
     * @param {ASTNode} node The node to check.
     * @returns {void}
     * @private
     */
    function checkLonelySetGet(node) {
        var isSetPresent = false;
        var isGetPresent = false;
        var isDescriptor = isPropertyDescriptor(node);

        for (var i = 0, end = node.properties.length; i < end; i++) {
            var property = node.properties[i];

            var propToCheck = "";
            if (property.kind === "init") {
                if (isDescriptor && !property.computed) {
                    propToCheck = property.key.name;
                }
            } else {
                propToCheck = property.kind;
            }

            switch (propToCheck) {
                case "set":
                    isSetPresent = true;
                    break;

                case "get":
                    isGetPresent = true;
                    break;

                default:
                    // Do nothing
            }

            if (isSetPresent && isGetPresent) {
                break;
            }
        }

        if (checkSetWithoutGet && isSetPresent && !isGetPresent) {
            context.report(node, "Getter is not present");
        } else if (checkGetWithoutSet && isGetPresent && !isSetPresent) {
            context.report(node, "Setter is not present");
        }
    }

    return {
        "ObjectExpression": function(node) {
            if (checkSetWithoutGet || checkGetWithoutSet) {
                checkLonelySetGet(node);
            }
        }
    };

};

module.exports.schema = [
    {
        "type": "object",
        "properties": {
            "getWithoutSet": {
                "type": "boolean"
            },
            "setWithoutGet": {
                "type": "boolean"
            }
        },
        "additionalProperties": false
    }
];
