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

# Copyright (c) 2007 - 2018 Detlev Offenbach <detlev@die-offenbachs.de>
#

"""
Module implementing a dialog to generate code for a Qt4/Qt5 dialog.
"""

from __future__ import unicode_literals

import os
import xml.etree.ElementTree

from PyQt5.QtCore import QMetaObject, QByteArray, QRegExp, Qt, pyqtSlot, \
    QMetaMethod, QSortFilterProxyModel
from PyQt5.QtGui import QStandardItemModel, QBrush, QStandardItem
from PyQt5.QtWidgets import QWidget, QDialog, QDialogButtonBox, QAction
from PyQt5 import uic


from E5Gui.E5Application import e5App
from E5Gui import E5MessageBox

from .Ui_CreateDialogCodeDialog import Ui_CreateDialogCodeDialog
from .NewDialogClassDialog import NewDialogClassDialog

from eric6config import getConfig

from Globals import qVersionTuple


pyqtSignatureRole = Qt.UserRole + 1
pythonSignatureRole = Qt.UserRole + 2
rubySignatureRole = Qt.UserRole + 3
returnTypeRole = Qt.UserRole + 4
parameterTypesListRole = Qt.UserRole + 5
parameterNamesListRole = Qt.UserRole + 6


class CreateDialogCodeDialog(QDialog, Ui_CreateDialogCodeDialog):
    """
    Class implementing a dialog to generate code for a Qt4/Qt5 dialog.
    """
    DialogClasses = {
        "QDialog", "QWidget", "QMainWindow", "QWizard", "QWizardPage",
        "QDockWidget", "QFrame", "QGroupBox", "QScrollArea", "QMdiArea",
        "QTabWidget", "QToolBox", "QStackedWidget"
    }
    Separator = 25 * "="
    
    def __init__(self, formName, project, parent=None):
        """
        Constructor
        
        @param formName name of the file containing the form (string)
        @param project reference to the project object
        @param parent parent widget if the dialog (QWidget)
        """
        super(CreateDialogCodeDialog, self).__init__(parent)
        self.setupUi(self)
        
        self.okButton = self.buttonBox.button(QDialogButtonBox.Ok)
        
        self.slotsView.header().hide()
        
        self.project = project
        
        self.formFile = formName
        filename, ext = os.path.splitext(self.formFile)
        self.srcFile = '{0}{1}'.format(
            filename, self.project.getDefaultSourceExtension())
        
        self.slotsModel = QStandardItemModel()
        self.proxyModel = QSortFilterProxyModel()
        self.proxyModel.setDynamicSortFilter(True)
        self.proxyModel.setSourceModel(self.slotsModel)
        self.slotsView.setModel(self.proxyModel)
        
        # initialize some member variables
        self.__initError = False
        self.__module = None
        
        if os.path.exists(self.srcFile):
            vm = e5App().getObject("ViewManager")
            ed = vm.getOpenEditor(self.srcFile)
            if ed and not vm.checkDirty(ed):
                self.__initError = True
                return
            
            try:
                splitExt = os.path.splitext(self.srcFile)
                if len(splitExt) == 2:
                    exts = [splitExt[1]]
                else:
                    exts = None
                from Utilities import ModuleParser
                self.__module = ModuleParser.readModule(
                    self.srcFile, extensions=exts, caching=False)
            except ImportError:
                pass
        
        if self.__module is not None:
            self.filenameEdit.setText(self.srcFile)
            
            classesList = []
            vagueClassesList = []
            for cls in list(self.__module.classes.values()):
                if not set(cls.super).isdisjoint(
                        CreateDialogCodeDialog.DialogClasses):
                    classesList.append(cls.name)
                else:
                    vagueClassesList.append(cls.name)
            classesList.sort()
            self.classNameCombo.addItems(classesList)
            if vagueClassesList:
                if classesList:
                    self.classNameCombo.addItem(
                        CreateDialogCodeDialog.Separator)
                self.classNameCombo.addItems(sorted(vagueClassesList))
        
        if os.path.exists(self.srcFile) and \
           self.__module is not None and \
           self.classNameCombo.count() == 0:
            self.__initError = True
            E5MessageBox.critical(
                self,
                self.tr("Create Dialog Code"),
                self.tr(
                    """The file <b>{0}</b> exists but does not contain"""
                    """ any classes.""").format(self.srcFile))
        
        self.okButton.setEnabled(self.classNameCombo.count() > 0)
        
        self.__updateSlotsModel()
        
    def initError(self):
        """
        Public method to determine, if there was an initialzation error.
        
        @return flag indicating an initialzation error (boolean)
        """
        return self.__initError
        
    def __objectName(self):
        """
        Private method to get the object name of the dialog.
        
        @return object name (string)
        """
        try:
            dlg = uic.loadUi(
                self.formFile, package=self.project.getProjectPath())
            return dlg.objectName()
        except (AttributeError, ImportError,
                xml.etree.ElementTree.ParseError) as err:
            E5MessageBox.critical(
                self,
                self.tr("uic error"),
                self.tr(
                    """<p>There was an error loading the form <b>{0}</b>"""
                    """.</p><p>{1}</p>""").format(self.formFile, str(err)))
            return ""
        
    def __className(self):
        """
        Private method to get the class name of the dialog.
        
        @return class name (sting)
        """
        try:
            dlg = uic.loadUi(
                self.formFile, package=self.project.getProjectPath())
            return dlg.metaObject().className()
        except (AttributeError, ImportError,
                xml.etree.ElementTree.ParseError) as err:
            E5MessageBox.critical(
                self,
                self.tr("uic error"),
                self.tr(
                    """<p>There was an error loading the form <b>{0}</b>"""
                    """.</p><p>{1}</p>""").format(self.formFile, str(err)))
            return ""
        
    def __signatures(self):
        """
        Private slot to get the signatures.
        
        @return list of signatures (list of strings)
        """
        if self.__module is None:
            return []
            
        signatures = []
        clsName = self.classNameCombo.currentText()
        if clsName:
            cls = self.__module.classes[clsName]
            for meth in list(cls.methods.values()):
                if meth.name.startswith("on_"):
                    if meth.pyqtSignature is not None:
                        sig = ", ".join(
                            [bytes(QMetaObject.normalizedType(t)).decode()
                             for t in meth.pyqtSignature.split(",")])
                        signatures.append("{0}({1})".format(meth.name, sig))
                    else:
                        signatures.append(meth.name)
        return signatures
        
    def __mapType(self, type_):
        """
        Private method to map a type as reported by Qt's meta object to the
        correct Python type.
        
        @param type_ type as reported by Qt (QByteArray)
        @return mapped Python type (string)
        """
        mapped = bytes(type_).decode()
        
        if self.project.getProjectLanguage() != "Python2" or \
           self.project.getProjectType == "PySide":
            # 1. check for const
            mapped = mapped.replace("const ", "")
            
            # 2. check for *
            mapped = mapped.replace("*", "")
            
            # 3. replace QString and QStringList
            mapped = mapped.replace("QStringList", "list")\
                           .replace("QString", "str")
            
            # 4. replace double by float
            mapped = mapped.replace("double", "float")
        
        return mapped
        
    def __updateSlotsModel(self):
        """
        Private slot to update the slots tree display.
        """
        self.filterEdit.clear()
        
        try:
            dlg = uic.loadUi(
                self.formFile, package=self.project.getProjectPath())
            objects = dlg.findChildren(QWidget) + dlg.findChildren(QAction)
            
            signatureList = self.__signatures()
            
            self.slotsModel.clear()
            self.slotsModel.setHorizontalHeaderLabels([""])
            for obj in objects:
                name = obj.objectName()
                if not name or name.startswith("qt_"):
                    # ignore un-named or internal objects
                    continue
                
                metaObject = obj.metaObject()
                className = metaObject.className()
                itm = QStandardItem("{0} ({1})".format(name, className))
                self.slotsModel.appendRow(itm)
                for index in range(metaObject.methodCount()):
                    metaMethod = metaObject.method(index)
                    if metaMethod.methodType() == QMetaMethod.Signal:
                        if qVersionTuple() >= (5, 0, 0):
                            itm2 = QStandardItem("on_{0}_{1}".format(
                                name,
                                bytes(metaMethod.methodSignature()).decode()))
                        else:
                            itm2 = QStandardItem("on_{0}_{1}".format(
                                name, metaMethod.signature()))
                        itm.appendRow(itm2)
                        if self.__module is not None:
                            if qVersionTuple() >= (5, 0, 0):
                                method = "on_{0}_{1}".format(
                                    name,
                                    bytes(metaMethod.methodSignature())
                                    .decode().split("(")[0])
                            else:
                                method = "on_{0}_{1}".format(
                                    name, metaMethod.signature().split("(")[0])
                            method2 = "{0}({1})".format(
                                method, ", ".join(
                                    [self.__mapType(t)
                                     for t in metaMethod.parameterTypes()]))
                            
                            if method2 in signatureList or \
                                    method in signatureList:
                                itm2.setFlags(Qt.ItemFlags(Qt.ItemIsEnabled))
                                itm2.setCheckState(Qt.Checked)
                                itm2.setForeground(QBrush(Qt.blue))
                                continue
                        
                        returnType = self.__mapType(
                            metaMethod.typeName().encode())
                        if returnType == 'void':
                            returnType = ""
                        parameterTypesList = [
                            self.__mapType(t)
                            for t in metaMethod.parameterTypes()]
                        pyqtSignature = ", ".join(parameterTypesList)
                        
                        parameterNames = metaMethod.parameterNames()
                        if parameterNames:
                            for index in range(len(parameterNames)):
                                if not parameterNames[index]:
                                    parameterNames[index] = \
                                        QByteArray("p{0:d}".format(index)
                                                   .encode("utf-8"))
                        parameterNamesList = [bytes(n).decode()
                                              for n in parameterNames]
                        methNamesSig = ", ".join(parameterNamesList)
                        
                        if methNamesSig:
                            if qVersionTuple() >= (5, 0, 0):
                                pythonSignature = \
                                    "on_{0}_{1}(self, {2})".format(
                                        name,
                                        bytes(metaMethod.methodSignature())
                                        .decode().split("(")[0],
                                        methNamesSig)
                            else:
                                pythonSignature = \
                                    "on_{0}_{1}(self, {2})".format(
                                        name,
                                        metaMethod.signature().split("(")[0],
                                        methNamesSig)
                        else:
                            if qVersionTuple() >= (5, 0, 0):
                                pythonSignature = "on_{0}_{1}(self)".format(
                                    name,
                                    bytes(metaMethod.methodSignature())
                                    .decode().split("(")[0])
                            else:
                                pythonSignature = "on_{0}_{1}(self)".format(
                                    name,
                                    metaMethod.signature().split("(")[0])
                        itm2.setData(pyqtSignature, pyqtSignatureRole)
                        itm2.setData(pythonSignature, pythonSignatureRole)
                        itm2.setData(returnType, returnTypeRole)
                        itm2.setData(parameterTypesList,
                                     parameterTypesListRole)
                        itm2.setData(parameterNamesList,
                                     parameterNamesListRole)
                        
                        itm2.setFlags(Qt.ItemFlags(
                            Qt.ItemIsUserCheckable |
                            Qt.ItemIsEnabled |
                            Qt.ItemIsSelectable)
                        )
                        itm2.setCheckState(Qt.Unchecked)
            
            self.slotsView.sortByColumn(0, Qt.AscendingOrder)
        except (AttributeError, ImportError,
                xml.etree.ElementTree.ParseError) as err:
            E5MessageBox.critical(
                self,
                self.tr("uic error"),
                self.tr(
                    """<p>There was an error loading the form <b>{0}</b>"""
                    """.</p><p>{1}</p>""").format(self.formFile, str(err)))
        
    def __generateCode(self):
        """
        Private slot to generate the code as requested by the user.
        """
        # first decide on extension
        if self.filenameEdit.text().endswith(".py") or \
           self.filenameEdit.text().endswith(".pyw"):
            self.__generatePythonCode()
        elif self.filenameEdit.text().endswith(".rb"):
            pass
        # second decide on project language
        elif self.project.getProjectLanguage() in ["Python2", "Python3"]:
            self.__generatePythonCode()
        elif self.project.getProjectLanguage() == "Ruby":
            pass
        else:
            # assume Python (our global default)
            self.__generatePythonCode()
        
    def __generatePythonCode(self):
        """
        Private slot to generate Python code as requested by the user.
        """
        # init some variables
        sourceImpl = []
        appendAtIndex = -1
        indentStr = "    "
        slotsCode = []
        
        if self.__module is None:
            # new file
            try:
                if self.project.getProjectLanguage() == "Python2":
                    if self.project.getProjectType() == "PySide":
                        tmplName = os.path.join(
                            getConfig('ericCodeTemplatesDir'),
                            "impl_pyside.py2.tmpl")
                    elif self.project.getProjectType() == "PyQt5":
                        tmplName = os.path.join(
                            getConfig('ericCodeTemplatesDir'),
                            "impl_pyqt5.py2.tmpl")
                    else:
                        tmplName = os.path.join(
                            getConfig('ericCodeTemplatesDir'),
                            "impl_pyqt.py2.tmpl")
                else:
                    if self.project.getProjectType() == "PySide":
                        tmplName = os.path.join(
                            getConfig('ericCodeTemplatesDir'),
                            "impl_pyside.py.tmpl")
                    elif self.project.getProjectType() in [
                            "PyQt5", "E6Plugin"]:
                        tmplName = os.path.join(
                            getConfig('ericCodeTemplatesDir'),
                            "impl_pyqt5.py.tmpl")
                    else:
                        tmplName = os.path.join(
                            getConfig('ericCodeTemplatesDir'),
                            "impl_pyqt.py.tmpl")
                tmplFile = open(tmplName, 'r', encoding="utf-8")
                template = tmplFile.read()
                tmplFile.close()
            except IOError as why:
                E5MessageBox.critical(
                    self,
                    self.tr("Code Generation"),
                    self.tr(
                        """<p>Could not open the code template file"""
                        """ "{0}".</p><p>Reason: {1}</p>""")
                    .format(tmplName, str(why)))
                return
            
            objName = self.__objectName()
            if objName:
                template = template\
                    .replace(
                        "$FORMFILE$",
                        os.path.splitext(os.path.basename(self.formFile))[0])\
                    .replace("$FORMCLASS$", objName)\
                    .replace("$CLASSNAME$", self.classNameCombo.currentText())\
                    .replace("$SUPERCLASS$", self.__className())
                
                sourceImpl = template.splitlines(True)
                appendAtIndex = -1
                
                # determine indent string
                for line in sourceImpl:
                    if line.lstrip().startswith("def __init__"):
                        indentStr = line.replace(line.lstrip(), "")
                        break
        else:
            # extend existing file
            try:
                srcFile = open(self.srcFile, 'r', encoding="utf-8")
                sourceImpl = srcFile.readlines()
                srcFile.close()
                if not sourceImpl[-1].endswith("\n"):
                    sourceImpl[-1] = "{0}{1}".format(sourceImpl[-1], "\n")
            except IOError as why:
                E5MessageBox.critical(
                    self,
                    self.tr("Code Generation"),
                    self.tr(
                        """<p>Could not open the source file "{0}".</p>"""
                        """<p>Reason: {1}</p>""")
                    .format(self.srcFile, str(why)))
                return
            
            cls = self.__module.classes[self.classNameCombo.currentText()]
            if cls.endlineno == len(sourceImpl) or cls.endlineno == -1:
                appendAtIndex = -1
                # delete empty lines at end
                while not sourceImpl[-1].strip():
                    del sourceImpl[-1]
            else:
                appendAtIndex = cls.endlineno - 1
                while not sourceImpl[appendAtIndex].strip():
                    appendAtIndex -= 1
                appendAtIndex += 1
            
            # determine indent string
            for line in sourceImpl[cls.lineno:cls.endlineno + 1]:
                if line.lstrip().startswith("def __init__"):
                    indentStr = line.replace(line.lstrip(), "")
                    break
        
        # do the coding stuff
        if self.project.getProjectLanguage() == "Python2":
            if self.project.getProjectType() == "PySide":
                pyqtSignatureFormat = '@Slot({0})'
            elif self.project.getProjectType() == "PyQt5":
                pyqtSignatureFormat = '@pyqtSlot({0})'
            else:
                pyqtSignatureFormat = '@pyqtSignature("{0}")'
        else:
            if self.project.getProjectType() == "PySide":
                pyqtSignatureFormat = '@Slot({0})'
            else:
                pyqtSignatureFormat = '@pyqtSlot({0})'
        for row in range(self.slotsModel.rowCount()):
            topItem = self.slotsModel.item(row)
            for childRow in range(topItem.rowCount()):
                child = topItem.child(childRow)
                if child.checkState() and \
                   child.flags() & Qt.ItemFlags(Qt.ItemIsUserCheckable):
                    slotsCode.append('{0}\n'.format(indentStr))
                    slotsCode.append('{0}{1}\n'.format(
                        indentStr,
                        pyqtSignatureFormat.format(
                            child.data(pyqtSignatureRole))))
                    slotsCode.append('{0}def {1}:\n'.format(
                        indentStr, child.data(pythonSignatureRole)))
                    indentStr2 = indentStr * 2
                    slotsCode.append('{0}"""\n'.format(indentStr2))
                    slotsCode.append(
                        '{0}Slot documentation goes here.\n'.format(
                            indentStr2))
                    if child.data(returnTypeRole) or \
                            child.data(parameterTypesListRole):
                        slotsCode.append('{0}\n'.format(indentStr2))
                        if child.data(parameterTypesListRole):
                            for name, type_ in zip(
                                child.data(parameterNamesListRole),
                                    child.data(parameterTypesListRole)):
                                slotsCode.append(
                                    '{0}@param {1} DESCRIPTION\n'.format(
                                        indentStr2, name))
                                slotsCode.append('{0}@type {1}\n'.format(
                                    indentStr2, type_))
                        if child.data(returnTypeRole):
                            slotsCode.append(
                                '{0}@returns DESCRIPTION\n'.format(
                                    indentStr2))
                            slotsCode.append('{0}@rtype {1}\n'.format(
                                indentStr2, child.data(returnTypeRole)))
                    slotsCode.append('{0}"""\n'.format(indentStr2))
                    slotsCode.append('{0}# {1}: not implemented yet\n'.format(
                        indentStr2, "TODO"))
                    slotsCode.append('{0}raise NotImplementedError\n'.format(
                        indentStr2))
        
        if appendAtIndex == -1:
            sourceImpl.extend(slotsCode)
        else:
            sourceImpl[appendAtIndex:appendAtIndex] = slotsCode
        
        # write the new code
        try:
            if self.project.useSystemEol():
                newline = None
            else:
                newline = self.project.getEolString()
            srcFile = open(self.filenameEdit.text(), 'w', encoding="utf-8",
                           newline=newline)
            srcFile.write("".join(sourceImpl))
            srcFile.close()
        except IOError as why:
            E5MessageBox.critical(
                self,
                self.tr("Code Generation"),
                self.tr("""<p>Could not write the source file "{0}".</p>"""
                        """<p>Reason: {1}</p>""")
                .format(self.filenameEdit.text(), str(why)))
            return
        
        self.project.appendFile(self.filenameEdit.text())
        
    @pyqtSlot(int)
    def on_classNameCombo_activated(self, index):
        """
        Private slot to handle the activated signal of the classname combo.
        
        @param index index of the activated item (integer)
        """
        if (self.classNameCombo.currentText() ==
                CreateDialogCodeDialog.Separator):
            self.okButton.setEnabled(False)
            self.filterEdit.clear()
            self.slotsModel.clear()
            self.slotsModel.setHorizontalHeaderLabels([""])
        else:
            self.okButton.setEnabled(True)
            self.__updateSlotsModel()
        
    def on_filterEdit_textChanged(self, text):
        """
        Private slot called, when thext of the filter edit has changed.
        
        @param text changed text (string)
        """
        re = QRegExp(text, Qt.CaseInsensitive, QRegExp.RegExp2)
        self.proxyModel.setFilterRegExp(re)
        
    @pyqtSlot()
    def on_newButton_clicked(self):
        """
        Private slot called to enter the data for a new dialog class.
        """
        path, file = os.path.split(self.srcFile)
        objName = self.__objectName()
        if objName:
            dlg = NewDialogClassDialog(objName, file, path, self)
            if dlg.exec_() == QDialog.Accepted:
                className, fileName = dlg.getData()
                
                self.classNameCombo.clear()
                self.classNameCombo.addItem(className)
                self.srcFile = fileName
                self.filenameEdit.setText(self.srcFile)
                self.__module = None
            
            self.okButton.setEnabled(self.classNameCombo.count() > 0)
        
    def on_buttonBox_clicked(self, button):
        """
        Private slot to handle the buttonBox clicked signal.
        
        @param button reference to the button that was clicked
            (QAbstractButton)
        """
        if button == self.okButton:
            self.__generateCode()
            self.accept()
