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

# Copyright (c) 2007 - 2019 Detlev Offenbach <detlev@die-offenbachs.de>
#

"""
Module implementing the Tabnanny plugin.
"""


import os

from PyQt5.QtCore import QObject, pyqtSignal

from E5Gui.E5Application import e5App
from E5Gui.E5Action import E5Action
from Project.ProjectBrowserModel import ProjectBrowserFileItem
from Utilities import determinePythonVersion

import Preferences
import UI.Info

# Start-Of-Header
name = "Tabnanny Plugin"
author = "Detlev Offenbach <detlev@die-offenbachs.de>"
autoactivate = True
deactivateable = True
version = UI.Info.VersionOnly
className = "TabnannyPlugin"
packageName = "__core__"
shortDescription = "Show the Tabnanny dialog."
longDescription = (
    """This plugin implements the Tabnanny dialog."""
    """ Tabnanny is used to check Python source files for correct"""
    """ indentations."""
)
pyqtApi = 2
# End-Of-Header

error = ""


class TabnannyPlugin(QObject):
    """
    Class implementing the Tabnanny plugin.
    
    @signal indentChecked(str, bool, str, str) emitted when the indent
        check was done.
    @signal batchFinished() emitted when a style check batch is done
    @signal error(str, str) emitted in case of an error
    """
    indentChecked = pyqtSignal(str, bool, str, str)
    batchFinished = pyqtSignal()
    error = pyqtSignal(str, str)
    
    def __init__(self, ui):
        """
        Constructor
        
        @param ui reference to the user interface object (UI.UserInterface)
        """
        super(TabnannyPlugin, self).__init__(ui)
        self.__ui = ui
        self.__initialize()
        
        self.backgroundService = e5App().getObject("BackgroundService")
        
        path = os.path.join(
            os.path.dirname(__file__), 'CheckerPlugins', 'Tabnanny')
        self.backgroundService.serviceConnect(
            'indent', 'Python2', path, 'Tabnanny',
            lambda *args: self.indentChecked.emit(*args),
            onErrorCallback=self.serviceErrorPy2,
            onBatchDone=self.batchJobDone)
        self.backgroundService.serviceConnect(
            'indent', 'Python3', path, 'Tabnanny',
            lambda *args: self.indentChecked.emit(*args),
            onErrorCallback=self.serviceErrorPy3,
            onBatchDone=self.batchJobDone)
        
        self.queuedBatches = []
        self.batchesFinished = True
    
    def __serviceError(self, fn, msg):
        """
        Private slot handling service errors.
        
        @param fn file name (string)
        @param msg message text (string)
        """
        self.error.emit(fn, msg)
    
    def serviceErrorPy2(self, fx, lang, fn, msg):
        """
        Public slot handling service errors for Python 2.
        
        @param fx service name (string)
        @param lang language (string)
        @param fn file name (string)
        @param msg message text (string)
        """
        if fx in ['indent', 'batch_indent'] and lang == 'Python2':
            if fx == 'indent':
                self.__serviceError(fn, msg)
            else:
                self.__serviceError(self.tr("Python 2 batch check"), msg)
                self.batchJobDone(fx, lang)
    
    def serviceErrorPy3(self, fx, lang, fn, msg):
        """
        Public slot handling service errors for Python 2.
        
        @param fx service name (string)
        @param lang language (string)
        @param fn file name (string)
        @param msg message text (string)
        """
        if fx in ['indent', 'batch_indent'] and lang == 'Python3':
            if fx == 'indent':
                self.__serviceError(fn, msg)
            else:
                self.__serviceError(self.tr("Python 3 batch check"), msg)
                self.batchJobDone(fx, lang)
    
    def batchJobDone(self, fx, lang):
        """
        Public slot handling the completion of a batch job.
        
        @param fx service name (string)
        @param lang language (string)
        """
        if fx in ['indent', 'batch_indent']:
            if lang in self.queuedBatches:
                self.queuedBatches.remove(lang)
            # prevent sending the signal multiple times
            if len(self.queuedBatches) == 0 and not self.batchesFinished:
                self.batchFinished.emit()
                self.batchesFinished = True
    
    def __initialize(self):
        """
        Private slot to (re)initialize the plugin.
        """
        self.__projectAct = None
        self.__projectTabnannyDialog = None
        
        self.__projectBrowserAct = None
        self.__projectBrowserMenu = None
        self.__projectBrowserTabnannyDialog = None
        
        self.__editors = []
        self.__editorAct = None
        self.__editorTabnannyDialog = None

    def indentCheck(self, lang, filename, source):
        """
        Public method to prepare an indentation check on one Python source
        file.

        @param lang language of the file or None to determine by internal
            algorithm (str or None)
        @param filename source filename (string)
        @param source string containing the code to check (string)
        """
        if lang is None:
            lang = 'Python{0}'.format(determinePythonVersion(filename, source))
        if lang not in ['Python2', 'Python3']:
            return
        
        self.backgroundService.enqueueRequest(
            'indent', lang, filename, [source])

    def indentBatchCheck(self, argumentsList):
        """
        Public method to prepare an indentation check on multiple Python
        source files.
        
        @param argumentsList list of arguments tuples with each tuple
            containing filename and source (string, string)
        """
        data = {
            "Python2": [],
            "Python3": [],
        }
        for filename, source in argumentsList:
            lang = 'Python{0}'.format(determinePythonVersion(filename, source))
            if lang not in ['Python2', 'Python3']:
                continue
            else:
                data[lang].append((filename, source))
        
        self.queuedBatches = []
        for lang in ['Python2', 'Python3']:
            if data[lang]:
                self.queuedBatches.append(lang)
                self.backgroundService.enqueueRequest('batch_indent', lang, "",
                                                      data[lang])
                self.batchesFinished = False
    
    def cancelIndentBatchCheck(self):
        """
        Public method to cancel all batch jobs.
        """
        for lang in ['Python2', 'Python3']:
            self.backgroundService.requestCancel('batch_style', lang)
    
    def activate(self):
        """
        Public method to activate this plugin.
        
        @return tuple of None and activation status (boolean)
        """
        menu = e5App().getObject("Project").getMenu("Checks")
        if menu:
            self.__projectAct = E5Action(
                self.tr('Check Indentations'),
                self.tr('&Indentations...'), 0, 0,
                self, 'project_check_indentations')
            self.__projectAct.setStatusTip(
                self.tr('Check indentations using tabnanny.'))
            self.__projectAct.setWhatsThis(self.tr(
                """<b>Check Indentations...</b>"""
                """<p>This checks Python files"""
                """ for bad indentations using tabnanny.</p>"""
            ))
            self.__projectAct.triggered.connect(self.__projectTabnanny)
            e5App().getObject("Project").addE5Actions([self.__projectAct])
            menu.addAction(self.__projectAct)
        
        self.__editorAct = E5Action(
            self.tr('Check Indentations'),
            self.tr('&Indentations...'), 0, 0,
            self, "")
        self.__editorAct.setWhatsThis(self.tr(
            """<b>Check Indentations...</b>"""
            """<p>This checks Python files"""
            """ for bad indentations using tabnanny.</p>"""
        ))
        self.__editorAct.triggered.connect(self.__editorTabnanny)
        
        e5App().getObject("Project").showMenu.connect(self.__projectShowMenu)
        e5App().getObject("ProjectBrowser").getProjectBrowser(
            "sources").showMenu.connect(self.__projectBrowserShowMenu)
        e5App().getObject("ViewManager").editorOpenedEd.connect(
            self.__editorOpened)
        e5App().getObject("ViewManager").editorClosedEd.connect(
            self.__editorClosed)
        
        for editor in e5App().getObject("ViewManager").getOpenEditors():
            self.__editorOpened(editor)
        
        return None, True

    def deactivate(self):
        """
        Public method to deactivate this plugin.
        """
        e5App().getObject("Project").showMenu.disconnect(
            self.__projectShowMenu)
        e5App().getObject("ProjectBrowser").getProjectBrowser(
            "sources").showMenu.disconnect(self.__projectBrowserShowMenu)
        e5App().getObject("ViewManager").editorOpenedEd.disconnect(
            self.__editorOpened)
        e5App().getObject("ViewManager").editorClosedEd.disconnect(
            self.__editorClosed)
        
        menu = e5App().getObject("Project").getMenu("Checks")
        if menu:
            menu.removeAction(self.__projectAct)
        
        if self.__projectBrowserMenu:
            if self.__projectBrowserAct:
                self.__projectBrowserMenu.removeAction(
                    self.__projectBrowserAct)
        
        for editor in self.__editors:
            editor.showMenu.disconnect(self.__editorShowMenu)
            menu = editor.getMenu("Checks")
            if menu is not None:
                menu.removeAction(self.__editorAct)
        
        self.__initialize()
    
    def __projectShowMenu(self, menuName, menu):
        """
        Private slot called, when the the project menu or a submenu is
        about to be shown.
        
        @param menuName name of the menu to be shown (string)
        @param menu reference to the menu (QMenu)
        """
        if menuName == "Checks" and self.__projectAct is not None:
            self.__projectAct.setEnabled(
                e5App().getObject("Project").getProjectLanguage() in
                ["Python3", "Python2", "Python", "MicroPython"])
    
    def __projectBrowserShowMenu(self, menuName, menu):
        """
        Private slot called, when the the project browser context menu or a
        submenu is about to be shown.
        
        @param menuName name of the menu to be shown (string)
        @param menu reference to the menu (QMenu)
        """
        if (
            menuName == "Checks" and
            e5App().getObject("Project").getProjectLanguage() in
                ["Python3", "Python2", "Python", "MicroPython"]
        ):
            self.__projectBrowserMenu = menu
            if self.__projectBrowserAct is None:
                self.__projectBrowserAct = E5Action(
                    self.tr('Check Indentations'),
                    self.tr('&Indentations...'), 0, 0,
                    self, "")
                self.__projectBrowserAct.setWhatsThis(self.tr(
                    """<b>Check Indentations...</b>"""
                    """<p>This checks Python files"""
                    """ for bad indentations using tabnanny.</p>"""
                ))
                self.__projectBrowserAct.triggered.connect(
                    self.__projectBrowserTabnanny)
            if self.__projectBrowserAct not in menu.actions():
                menu.addAction(self.__projectBrowserAct)
    
    def __projectTabnanny(self):
        """
        Private slot used to check the project files for bad indentations.
        """
        project = e5App().getObject("Project")
        project.saveAllScripts()
        ppath = project.getProjectPath()
        files = [os.path.join(ppath, file)
                 for file in project.pdata["SOURCES"]
                 if file.endswith(
                     tuple(Preferences.getPython("Python3Extensions")) +
                     tuple(Preferences.getPython("PythonExtensions")))]
        
        from CheckerPlugins.Tabnanny.TabnannyDialog import TabnannyDialog
        self.__projectTabnannyDialog = TabnannyDialog(self)
        self.__projectTabnannyDialog.show()
        self.__projectTabnannyDialog.prepare(files, project)
    
    def __projectBrowserTabnanny(self):
        """
        Private method to handle the tabnanny context menu action of the
        project sources browser.
        """
        browser = e5App().getObject("ProjectBrowser").getProjectBrowser(
            "sources")
        if browser.getSelectedItemsCount([ProjectBrowserFileItem]) > 1:
            fn = []
            for itm in browser.getSelectedItems([ProjectBrowserFileItem]):
                fn.append(itm.fileName())
        else:
            itm = browser.model().item(browser.currentIndex())
            try:
                fn = itm.fileName()
            except AttributeError:
                fn = itm.dirName()
        
        from CheckerPlugins.Tabnanny.TabnannyDialog import TabnannyDialog
        self.__projectBrowserTabnannyDialog = TabnannyDialog(self)
        self.__projectBrowserTabnannyDialog.show()
        self.__projectBrowserTabnannyDialog.start(fn)
    
    def __editorOpened(self, editor):
        """
        Private slot called, when a new editor was opened.
        
        @param editor reference to the new editor (QScintilla.Editor)
        """
        menu = editor.getMenu("Checks")
        if menu is not None:
            menu.addAction(self.__editorAct)
            editor.showMenu.connect(self.__editorShowMenu)
            self.__editors.append(editor)
    
    def __editorClosed(self, editor):
        """
        Private slot called, when an editor was closed.
        
        @param editor reference to the editor (QScintilla.Editor)
        """
        try:
            self.__editors.remove(editor)
        except ValueError:
            pass
    
    def __editorShowMenu(self, menuName, menu, editor):
        """
        Private slot called, when the the editor context menu or a submenu is
        about to be shown.
        
        @param menuName name of the menu to be shown (string)
        @param menu reference to the menu (QMenu)
        @param editor reference to the editor
        """
        if menuName == "Checks":
            if self.__editorAct not in menu.actions():
                menu.addAction(self.__editorAct)
            self.__editorAct.setEnabled(editor.isPyFile())
    
    def __editorTabnanny(self):
        """
        Private slot to handle the tabnanny context menu action of the editors.
        """
        editor = e5App().getObject("ViewManager").activeWindow()
        if editor is not None:
            if editor.checkDirty() and editor.getFileName() is not None:
                from CheckerPlugins.Tabnanny.TabnannyDialog import (
                    TabnannyDialog
                )
                self.__editorTabnannyDialog = TabnannyDialog(self)
                self.__editorTabnannyDialog.show()
                self.__editorTabnannyDialog.start(editor.getFileName())
