# -*- coding: utf-8 -*-

# Copyright (c) 2006 - 2020 Detlev Offenbach <detlev@die-offenbachs.de>
#

"""
Module implementing the Editor APIs configuration page.
"""


from PyQt5.QtCore import QDir, pyqtSlot, QFileInfo
from PyQt5.QtWidgets import QInputDialog

from E5Gui.E5Application import e5App
from E5Gui import E5MessageBox
from E5Gui.E5PathPicker import E5PathPickerModes

from .ConfigurationPageBase import ConfigurationPageBase
from .Ui_EditorAPIsPage import Ui_EditorAPIsPage

import Preferences
import Utilities


class EditorAPIsPage(ConfigurationPageBase, Ui_EditorAPIsPage):
    """
    Class implementing the Editor APIs configuration page.
    """
    def __init__(self):
        """
        Constructor
        """
        super(EditorAPIsPage, self).__init__()
        self.setupUi(self)
        self.setObjectName("EditorAPIsPage")
        
        self.apiFilePicker.setMode(E5PathPickerModes.OpenFileMode)
        self.apiFilePicker.setToolTip(self.tr(
            "Press to select an API file via a selection dialog"))
        self.apiFilePicker.setFilters(self.tr(
            "API File (*.api);;All Files (*)"))
        
        self.prepareApiButton.setText(self.tr("Compile APIs"))
        self.__currentAPI = None
        self.__inPreparation = False
        
        # set initial values
        self.pluginManager = e5App().getObject("PluginManager")
        self.apiAutoPrepareCheckBox.setChecked(
            Preferences.getEditor("AutoPrepareAPIs"))
        
        import QScintilla.Lexers
        self.apis = {}
        apiLanguages = sorted(
            [''] + list(QScintilla.Lexers.getSupportedApiLanguages()))
        for lang in apiLanguages:
            self.apiLanguageComboBox.addItem(
                QScintilla.Lexers.getLanguageIcon(lang, False),
                lang)
        self.__currentApiLanguage = ""
        self.on_apiLanguageComboBox_activated(self.__currentApiLanguage)
    
    def __apiKey(self, language, projectType):
        """
        Private method to generate a key for the apis dictionary.
        
        @param language programming language of the API
        @type str
        @param projectType project type of the API
        @type str
        @return key to be used
        @rtype str
        """
        if projectType:
            key = (language, projectType)
        else:
            key = (language, "")
        return key
    
    def save(self):
        """
        Public slot to save the Editor APIs configuration.
        """
        Preferences.setEditor(
            "AutoPrepareAPIs",
            self.apiAutoPrepareCheckBox.isChecked())
        
        language = self.apiLanguageComboBox.currentText()
        projectType = self.projectTypeComboBox.itemData(
            self.projectTypeComboBox.currentIndex())
        key = self.__apiKey(language, projectType)
        self.apis[key] = self.__editorGetApisFromApiList()
        
        for (language, projectType), apis in self.apis.items():
            Preferences.setEditorAPI(language, projectType, apis)
    
    @pyqtSlot(int)
    def on_projectTypeComboBox_activated(self, index):
        """
        Private slot to handle the selection of a project type.
        
        @param index index of the selected entry
        @type str
        """
        if self.__currentApiProjectTypeIndex == index:
            return
        
        self.__currentApiProjectTypeIndex = index
        self.__fillApisList()
        
    @pyqtSlot(str)
    def on_apiLanguageComboBox_activated(self, language):
        """
        Private slot to fill the api listbox of the api page.
        
        @param language selected API language
        @type str
        """
        if self.__currentApiLanguage == language:
            return
        
        self.__fillProjectTypeComboBox(language)
    
    def __fillProjectTypeComboBox(self, language):
        """
        Private slot to fill the selection of available project types for the
        given language.
        
        @param language selected API language
        @type str
        """
        self.projectTypeComboBox.clear()
        
        apiProjectTypes = sorted(
            [("", "")] +
            [(trans, ptype) for ptype, trans in
                e5App().getObject("Project").getProjectTypes(language).items()
             ]
        )
        for projectTypeStr, projectType in apiProjectTypes:
            self.projectTypeComboBox.addItem(projectTypeStr, projectType)
    
        self.__currentApiProjectTypeIndex = -1
        self.__currentApiProjectType = ""
        
        self.on_projectTypeComboBox_activated(0)
    
    def __fillApisList(self):
        """
        Private slot to fill the list of API files.
        """
        self.apis[
            self.__apiKey(self.__currentApiLanguage,
                          self.__currentApiProjectType)
        ] = self.__editorGetApisFromApiList()
        
        self.__currentApiLanguage = self.apiLanguageComboBox.currentText()
        self.__currentApiProjectType = self.projectTypeComboBox.itemData(
            self.projectTypeComboBox.currentIndex())
        self.apiList.clear()
        
        if not self.__currentApiLanguage:
            self.apiGroup.setEnabled(False)
            return
            
        self.apiGroup.setEnabled(True)
        self.deleteApiFileButton.setEnabled(False)
        self.addApiFileButton.setEnabled(False)
        self.apiFilePicker.clear()
        
        key = self.__apiKey(self.__currentApiLanguage,
                            self.__currentApiProjectType)
        if key not in self.apis:
            # populate on demand
            self.apis[key] = Preferences.getEditorAPI(
                self.__currentApiLanguage,
                projectType=self.__currentApiProjectType)[:]
        for api in self.apis[key]:
            if api:
                self.apiList.addItem(api)
        self.prepareApiButton.setEnabled(self.apiList.count() > 0)
        
        from QScintilla.APIsManager import APIsManager
        self.__currentAPI = APIsManager().getAPIs(
            self.__currentApiLanguage,
            projectType=self.__currentApiProjectType)
        if self.__currentAPI is not None:
            self.__currentAPI.apiPreparationFinished.connect(
                self.__apiPreparationFinished)
            self.__currentAPI.apiPreparationCancelled.connect(
                self.__apiPreparationCancelled)
            self.__currentAPI.apiPreparationStarted.connect(
                self.__apiPreparationStarted)
            self.addInstalledApiFileButton.setEnabled(
                len(self.__currentAPI.installedAPIFiles()) > 0)
        else:
            self.addInstalledApiFileButton.setEnabled(False)
        
        self.addPluginApiFileButton.setEnabled(
            len(self.pluginManager.getPluginApiFiles(
                self.__currentApiLanguage)) > 0)
        
    def __editorGetApisFromApiList(self):
        """
        Private slot to retrieve the api filenames from the list.
        
        @return list of api filenames (list of strings)
        """
        apis = []
        for row in range(self.apiList.count()):
            apis.append(self.apiList.item(row).text())
        return apis
        
    @pyqtSlot()
    def on_addApiFileButton_clicked(self):
        """
        Private slot to add the api file displayed to the listbox.
        """
        file = self.apiFilePicker.text()
        if file:
            self.apiList.addItem(Utilities.toNativeSeparators(file))
            self.apiFilePicker.clear()
        self.prepareApiButton.setEnabled(self.apiList.count() > 0)
        
    @pyqtSlot()
    def on_deleteApiFileButton_clicked(self):
        """
        Private slot to delete the currently selected file of the listbox.
        """
        crow = self.apiList.currentRow()
        if crow >= 0:
            itm = self.apiList.takeItem(crow)       # __IGNORE_WARNING__
            del itm
        self.prepareApiButton.setEnabled(self.apiList.count() > 0)
        
    @pyqtSlot()
    def on_addInstalledApiFileButton_clicked(self):
        """
        Private slot to add an API file from the list of installed API files
        for the selected lexer language.
        """
        installedAPIFiles = self.__currentAPI.installedAPIFiles()
        if installedAPIFiles:
            installedAPIFilesPath = QFileInfo(installedAPIFiles[0]).path()
            installedAPIFilesShort = []
            for installedAPIFile in installedAPIFiles:
                installedAPIFilesShort.append(
                    QFileInfo(installedAPIFile).fileName())
            file, ok = QInputDialog.getItem(
                self,
                self.tr("Add from installed APIs"),
                self.tr("Select from the list of installed API files"),
                installedAPIFilesShort,
                0, False)
            if ok:
                self.apiList.addItem(Utilities.toNativeSeparators(
                    QFileInfo(QDir(installedAPIFilesPath), file)
                    .absoluteFilePath()))
        else:
            E5MessageBox.warning(
                self,
                self.tr("Add from installed APIs"),
                self.tr("""There are no APIs installed yet."""
                        """ Selection is not available."""))
            self.addInstalledApiFileButton.setEnabled(False)
        self.prepareApiButton.setEnabled(self.apiList.count() > 0)
        
    @pyqtSlot()
    def on_addPluginApiFileButton_clicked(self):
        """
        Private slot to add an API file from the list of API files installed
        by plugins for the selected lexer language.
        """
        pluginAPIFiles = self.pluginManager.getPluginApiFiles(
            self.__currentApiLanguage)
        pluginAPIFilesDict = {}
        for apiFile in pluginAPIFiles:
            pluginAPIFilesDict[QFileInfo(apiFile).fileName()] = apiFile
        file, ok = QInputDialog.getItem(
            self,
            self.tr("Add from Plugin APIs"),
            self.tr(
                "Select from the list of API files installed by plugins"),
            sorted(pluginAPIFilesDict.keys()),
            0, False)
        if ok:
            self.apiList.addItem(Utilities.toNativeSeparators(
                pluginAPIFilesDict[file]))
        self.prepareApiButton.setEnabled(self.apiList.count() > 0)
        
    @pyqtSlot()
    def on_prepareApiButton_clicked(self):
        """
        Private slot to prepare the API file for the currently selected
            language.
        """
        if self.__inPreparation:
            self.__currentAPI and self.__currentAPI.cancelPreparation()
        else:
            if self.__currentAPI is not None:
                self.__currentAPI.prepareAPIs(
                    ondemand=True,
                    rawList=self.__editorGetApisFromApiList())
        
    def __apiPreparationFinished(self):
        """
        Private method called after the API preparation has finished.
        """
        self.prepareApiProgressBar.reset()
        self.prepareApiProgressBar.setRange(0, 100)
        self.prepareApiProgressBar.setValue(0)
        self.prepareApiButton.setText(self.tr("Compile APIs"))
        self.__inPreparation = False
    
    def __apiPreparationCancelled(self):
        """
        Private slot called after the API preparation has been cancelled.
        """
        self.__apiPreparationFinished()
    
    def __apiPreparationStarted(self):
        """
        Private method called after the API preparation has started.
        """
        self.prepareApiProgressBar.setRange(0, 0)
        self.prepareApiProgressBar.setValue(0)
        self.prepareApiButton.setText(self.tr("Cancel compilation"))
        self.__inPreparation = True
        
    def saveState(self):
        """
        Public method to save the current state of the widget.
        
        @return tuple containing the index of the selected lexer language
            and the index of the selected project type
        @rtype tuple of int and int
        """
        return (
            self.apiLanguageComboBox.currentIndex(),
            self.projectTypeComboBox.currentIndex()
        )
        
    def setState(self, state):
        """
        Public method to set the state of the widget.
        
        @param state state data generated by saveState
        """
        self.apiLanguageComboBox.setCurrentIndex(state[0])
        self.on_apiLanguageComboBox_activated(
            self.apiLanguageComboBox.currentText())
        
        self.projectTypeComboBox.setCurrentIndex(state[1])
        self.on_projectTypeComboBox_activated(state[1])
    
    @pyqtSlot()
    def on_apiList_itemSelectionChanged(self):
        """
        Private slot to react on changes of API selections.
        """
        self.deleteApiFileButton.setEnabled(
            len(self.apiList.selectedItems()) > 0)
    
    @pyqtSlot(str)
    def on_apiFilePicker_textChanged(self, txt):
        """
        Private slot to handle the entering of an API file name.
        
        @param txt text of the line edit (string)
        """
        enable = txt != ""
        
        if enable:
            # check for already added file
            for row in range(self.apiList.count()):
                if txt == self.apiList.item(row).text():
                    enable = False
                    break
        
        self.addApiFileButton.setEnabled(enable)
    

def create(dlg):
    """
    Module function to create the configuration page.
    
    @param dlg reference to the configuration dialog
    @return reference to the instantiated page (ConfigurationPageBase)
    """
    page = EditorAPIsPage()
    return page
