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

# Copyright (c) 2007 - 2022 Detlev Offenbach <detlev@die-offenbachs.de>
#

"""
Module implementing the Plugin installation dialog.
"""

import os
import sys
import shutil
import zipfile
import compileall
import glob
import contextlib
import urllib.parse

from PyQt6.QtCore import pyqtSlot, Qt, QDir, QFileInfo
from PyQt6.QtWidgets import (
    QWidget, QDialogButtonBox, QAbstractButton, QApplication, QDialog,
    QVBoxLayout
)

from EricWidgets import EricFileDialog
from EricWidgets.EricMainWindow import EricMainWindow

from .Ui_PluginInstallDialog import Ui_PluginInstallDialog

import Utilities
import Preferences

from Utilities.uic import compileUiFiles


class PluginInstallWidget(QWidget, Ui_PluginInstallDialog):
    """
    Class implementing the Plugin installation dialog.
    """
    def __init__(self, pluginManager, pluginFileNames, parent=None):
        """
        Constructor
        
        @param pluginManager reference to the plugin manager object
        @param pluginFileNames list of plugin files suggested for
            installation (list of strings)
        @param parent parent of this dialog (QWidget)
        """
        super().__init__(parent)
        self.setupUi(self)
        
        if pluginManager is None:
            # started as external plugin installer
            from .PluginManager import PluginManager
            self.__pluginManager = PluginManager(doLoadPlugins=False)
            self.__external = True
        else:
            self.__pluginManager = pluginManager
            self.__external = False
        
        self.__backButton = self.buttonBox.addButton(
            self.tr("< Back"), QDialogButtonBox.ButtonRole.ActionRole)
        self.__nextButton = self.buttonBox.addButton(
            self.tr("Next >"), QDialogButtonBox.ButtonRole.ActionRole)
        self.__finishButton = self.buttonBox.addButton(
            self.tr("Install"), QDialogButtonBox.ButtonRole.ActionRole)
        
        self.__closeButton = self.buttonBox.button(
            QDialogButtonBox.StandardButton.Close)
        self.__cancelButton = self.buttonBox.button(
            QDialogButtonBox.StandardButton.Cancel)
        
        userDir = self.__pluginManager.getPluginDir("user")
        if userDir is not None:
            self.destinationCombo.addItem(
                self.tr("User plugins directory"),
                userDir)
        
        globalDir = self.__pluginManager.getPluginDir("global")
        if globalDir is not None and os.access(globalDir, os.W_OK):
            self.destinationCombo.addItem(
                self.tr("Global plugins directory"),
                globalDir)
        
        self.__installedDirs = []
        self.__installedFiles = []
        
        self.__restartNeeded = False
        
        downloadDir = QDir(Preferences.getPluginManager("DownloadPath"))
        for pluginFileName in pluginFileNames:
            fi = QFileInfo(pluginFileName)
            if fi.isRelative():
                pluginFileName = QFileInfo(
                    downloadDir, fi.fileName()).absoluteFilePath()
            self.archivesList.addItem(pluginFileName)
            self.archivesList.sortItems()
        
        self.__currentIndex = 0
        self.__selectPage()
    
    def restartNeeded(self):
        """
        Public method to check, if a restart of the IDE is required.
        
        @return flag indicating a restart is required (boolean)
        """
        return self.__restartNeeded
    
    def __createArchivesList(self):
        """
        Private method to create a list of plugin archive names.
        
        @return list of plugin archive names (list of strings)
        """
        archivesList = []
        for row in range(self.archivesList.count()):
            archivesList.append(self.archivesList.item(row).text())
        return archivesList

    def __selectPage(self):
        """
        Private method to show the right wizard page.
        """
        self.wizard.setCurrentIndex(self.__currentIndex)
        if self.__currentIndex == 0:
            self.__backButton.setEnabled(False)
            self.__nextButton.setEnabled(self.archivesList.count() > 0)
            self.__finishButton.setEnabled(False)
            self.__closeButton.hide()
            self.__cancelButton.show()
        elif self.__currentIndex == 1:
            self.__backButton.setEnabled(True)
            self.__nextButton.setEnabled(self.destinationCombo.count() > 0)
            self.__finishButton.setEnabled(False)
            self.__closeButton.hide()
            self.__cancelButton.show()
        else:
            self.__backButton.setEnabled(True)
            self.__nextButton.setEnabled(False)
            self.__finishButton.setEnabled(True)
            self.__closeButton.hide()
            self.__cancelButton.show()
            
            msg = self.tr(
                "Plugin ZIP-Archives:\n{0}\n\nDestination:\n{1} ({2})"
            ).format(
                "\n".join(self.__createArchivesList()),
                self.destinationCombo.currentText(),
                self.destinationCombo.itemData(
                    self.destinationCombo.currentIndex()
                )
            )
            self.summaryEdit.setPlainText(msg)
    
    @pyqtSlot()
    def on_addArchivesButton_clicked(self):
        """
        Private slot to select plugin ZIP-archives via a file selection dialog.
        """
        dn = Preferences.getPluginManager("DownloadPath")
        archives = EricFileDialog.getOpenFileNames(
            self,
            self.tr("Select plugin ZIP-archives"),
            dn,
            self.tr("Plugin archive (*.zip)"))
        
        if archives:
            matchflags = Qt.MatchFlag.MatchFixedString
            if not Utilities.isWindowsPlatform():
                matchflags |= Qt.MatchFlag.MatchCaseSensitive
            for archive in archives:
                if len(self.archivesList.findItems(archive, matchflags)) == 0:
                    # entry not in list already
                    self.archivesList.addItem(archive)
            self.archivesList.sortItems()
        
        self.__nextButton.setEnabled(self.archivesList.count() > 0)
    
    @pyqtSlot()
    def on_archivesList_itemSelectionChanged(self):
        """
        Private slot called, when the selection of the archives list changes.
        """
        self.removeArchivesButton.setEnabled(
            len(self.archivesList.selectedItems()) > 0)
    
    @pyqtSlot()
    def on_removeArchivesButton_clicked(self):
        """
        Private slot to remove archives from the list.
        """
        for archiveItem in self.archivesList.selectedItems():
            itm = self.archivesList.takeItem(
                self.archivesList.row(archiveItem))
            del itm
        
        self.__nextButton.setEnabled(self.archivesList.count() > 0)
    
    @pyqtSlot(QAbstractButton)
    def on_buttonBox_clicked(self, button):
        """
        Private slot to handle the click of a button of the button box.
        
        @param button reference to the button pressed (QAbstractButton)
        """
        if button == self.__backButton:
            self.__currentIndex -= 1
            self.__selectPage()
        elif button == self.__nextButton:
            self.__currentIndex += 1
            self.__selectPage()
        elif button == self.__finishButton:
            self.__finishButton.setEnabled(False)
            self.__installPlugins()
            if not Preferences.getPluginManager("ActivateExternal"):
                Preferences.setPluginManager("ActivateExternal", True)
                self.__restartNeeded = True
            self.__closeButton.show()
            self.__cancelButton.hide()
    
    def __installPlugins(self):
        """
        Private method to install the selected plugin archives.
        
        @return flag indicating success (boolean)
        """
        res = True
        self.summaryEdit.clear()
        for archive in self.__createArchivesList():
            self.summaryEdit.append(
                self.tr("Installing {0} ...").format(archive))
            ok, msg, restart = self.__installPlugin(archive)
            res = res and ok
            if ok:
                self.summaryEdit.append(self.tr("  ok"))
            else:
                self.summaryEdit.append(msg)
            if restart:
                self.__restartNeeded = True
        self.summaryEdit.append("\n")
        if res:
            self.summaryEdit.append(self.tr(
                """The plugins were installed successfully."""))
        else:
            self.summaryEdit.append(self.tr(
                """Some plugins could not be installed."""))
        
        return res
    
    def __installPlugin(self, archiveFilename):
        """
        Private slot to install the selected plugin.
        
        @param archiveFilename name of the plugin archive
            file (string)
        @return flag indicating success (boolean), error message
            upon failure (string) and flag indicating a restart
            of the IDE is required (boolean)
        """
        installedPluginName = ""
        
        archive = archiveFilename
        destination = self.destinationCombo.itemData(
            self.destinationCombo.currentIndex())
        
        # check if archive is a local url
        url = urllib.parse.urlparse(archive)
        if url[0].lower() == 'file':
            archive = url[2]

        # check, if the archive exists
        if not os.path.exists(archive):
            return (
                False,
                self.tr(
                    """<p>The archive file <b>{0}</b> does not exist. """
                    """Aborting...</p>""").format(archive),
                False
            )
        
        # check, if the archive is a valid zip file
        if not zipfile.is_zipfile(archive):
            return (
                False,
                self.tr(
                    """<p>The file <b>{0}</b> is not a valid plugin """
                    """ZIP-archive. Aborting...</p>""").format(archive),
                False
            )
        
        # check, if the destination is writeable
        if not os.access(destination, os.W_OK):
            return (
                False,
                self.tr(
                    """<p>The destination directory <b>{0}</b> is not """
                    """writeable. Aborting...</p>""").format(destination),
                False
            )
        
        zipFile = zipfile.ZipFile(archive, "r")
        
        # check, if the archive contains a valid plugin
        pluginFound = False
        pluginFileName = ""
        for name in zipFile.namelist():
            if self.__pluginManager.isValidPluginName(name):
                installedPluginName = name[:-3]
                pluginFound = True
                pluginFileName = name
                break
        
        if not pluginFound:
            return (
                False,
                self.tr(
                    """<p>The file <b>{0}</b> is not a valid plugin """
                    """ZIP-archive. Aborting...</p>""").format(archive),
                False
            )
        
        # parse the plugin module's plugin header
        pluginSource = Utilities.decode(zipFile.read(pluginFileName))[0]
        packageName = ""
        internalPackages = []
        needsRestart = False
        pyqtApi = 0
        doCompile = True
        for line in pluginSource.splitlines():
            if line.startswith("packageName"):
                tokens = line.split("=")
                if (
                    tokens[0].strip() == "packageName" and
                    tokens[1].strip()[1:-1] != "__core__"
                ):
                    if tokens[1].strip()[0] in ['"', "'"]:
                        packageName = tokens[1].strip()[1:-1]
                    else:
                        if tokens[1].strip() == "None":
                            packageName = "None"
            elif line.startswith("internalPackages"):
                tokens = line.split("=")
                token = tokens[1].strip()[1:-1]
                # it is a comma separated string
                internalPackages = [p.strip() for p in token.split(",")]
            elif line.startswith("needsRestart"):
                tokens = line.split("=")
                needsRestart = tokens[1].strip() == "True"
            elif line.startswith("pyqtApi"):
                tokens = line.split("=")
                with contextlib.suppress(ValueError):
                    pyqtApi = int(tokens[1].strip())
            elif line.startswith("doNotCompile"):
                tokens = line.split("=")
                if tokens[1].strip() == "True":
                    doCompile = False
            elif line.startswith("# End-Of-Header"):
                break
        
        if not packageName:
            return (
                False,
                self.tr(
                    """<p>The plugin module <b>{0}</b> does not contain """
                    """a 'packageName' attribute. Aborting...</p>"""
                ).format(pluginFileName),
                False
            )
        
        if pyqtApi < 2:
            return (
                False,
                self.tr(
                    """<p>The plugin module <b>{0}</b> does not conform"""
                    """ with the PyQt v2 API. Aborting...</p>"""
                ).format(pluginFileName),
                False
            )
        
        # check, if it is a plugin, that collides with others
        if (
            not os.path.exists(os.path.join(destination, pluginFileName)) and
            packageName != "None" and
            os.path.exists(os.path.join(destination, packageName))
        ):
            return (
                False,
                self.tr("""<p>The plugin package <b>{0}</b> exists. """
                        """Aborting...</p>""").format(
                    os.path.join(destination, packageName)),
                False
            )
        
        if (
            os.path.exists(os.path.join(destination, pluginFileName)) and
            packageName != "None" and
            not os.path.exists(os.path.join(destination, packageName))
        ):
            return (
                False,
                self.tr("""<p>The plugin module <b>{0}</b> exists. """
                        """Aborting...</p>""").format(
                    os.path.join(destination, pluginFileName)),
                False
            )
        
        activatePlugin = False
        if not self.__external:
            activatePlugin = (
                not self.__pluginManager.isPluginLoaded(
                    installedPluginName) or
                (self.__pluginManager.isPluginLoaded(installedPluginName) and
                 self.__pluginManager.isPluginActive(installedPluginName))
            )
            # try to unload a plugin with the same name
            self.__pluginManager.unloadPlugin(installedPluginName)
        
        # uninstall existing plug-in first to get clean conditions
        if (
            packageName != "None" and
            not os.path.exists(
                os.path.join(destination, packageName, "__init__.py"))
        ):
            # package directory contains just data, don't delete it
            self.__uninstallPackage(destination, pluginFileName, "")
        else:
            self.__uninstallPackage(destination, pluginFileName, packageName)
        
        # clean sys.modules
        reload_ = self.__pluginManager.removePluginFromSysModules(
            installedPluginName, packageName, internalPackages)
        
        # now do the installation
        self.__installedDirs = []
        self.__installedFiles = []
        try:
            if packageName != "None":
                namelist = sorted(zipFile.namelist())
                tot = len(namelist)
                self.progress.setMaximum(tot)
                QApplication.processEvents()
                for prog, name in enumerate(namelist):
                    self.progress.setValue(prog)
                    QApplication.processEvents()
                    if (
                        name == pluginFileName or
                        name.startswith("{0}/".format(packageName)) or
                        name.startswith("{0}\\".format(packageName))
                    ):
                        outname = name.replace("/", os.sep)
                        outname = os.path.join(destination, outname)
                        if outname.endswith("/") or outname.endswith("\\"):
                            # it is a directory entry
                            outname = outname[:-1]
                            if not os.path.exists(outname):
                                self.__makedirs(outname)
                        else:
                            # it is a file
                            d = os.path.dirname(outname)
                            if not os.path.exists(d):
                                self.__makedirs(d)
                            with open(outname, "wb") as f:
                                f.write(zipFile.read(name))
                            self.__installedFiles.append(outname)
                self.progress.setValue(tot)
                # now compile user interface files
                compileUiFiles(os.path.join(destination, packageName), True)
            else:
                outname = os.path.join(destination, pluginFileName)
                with open(outname, "w", encoding="utf-8") as f:
                    f.write(pluginSource)
                self.__installedFiles.append(outname)
        except OSError as why:
            self.__rollback()
            return (
                False,
                self.tr("Error installing plugin. Reason: {0}")
                .format(str(why)),
                False
            )
        except Exception:
            sys.stderr.write("Unspecific exception installing plugin.\n")
            self.__rollback()
            return (
                False,
                self.tr("Unspecific exception installing plugin."),
                False
            )
        
        # now compile the plugins
        if doCompile:
            dirName = os.path.join(destination, packageName)
            files = os.path.join(destination, pluginFileName)
            os.path.join_unicode = False
            compileall.compile_dir(dirName, quiet=True)
            compileall.compile_file(files, quiet=True)
            os.path.join_unicode = True
        
            # now load and activate the plugin
        self.__pluginManager.loadPlugin(
            installedPluginName, destination, reload_=reload_, install=True)
        if activatePlugin and not self.__external:
            self.__pluginManager.activatePlugin(installedPluginName)
        
        return True, "", needsRestart
    
    def __rollback(self):
        """
        Private method to rollback a failed installation.
        """
        for fname in self.__installedFiles:
            if os.path.exists(fname):
                os.remove(fname)
        for dname in self.__installedDirs:
            if os.path.exists(dname):
                shutil.rmtree(dname)
    
    def __makedirs(self, name, mode=0o777):
        """
        Private method to create a directory and all intermediate ones.
        
        This is an extended version of the Python one in order to
        record the created directories.
        
        @param name name of the directory to create (string)
        @param mode permission to set for the new directory (integer)
        """
        head, tail = os.path.split(name)
        if not tail:
            head, tail = os.path.split(head)
        if head and tail and not os.path.exists(head):
            self.__makedirs(head, mode)
            if tail == os.curdir:
                # xxx/newdir/. exists if xxx/newdir exists
                return
        os.mkdir(name, mode)
        self.__installedDirs.append(name)
    
    def __uninstallPackage(self, destination, pluginFileName, packageName):
        """
        Private method to uninstall an already installed plugin to prepare
        the update.
        
        @param destination name of the plugin directory (string)
        @param pluginFileName name of the plugin file (string)
        @param packageName name of the plugin package (string)
        """
        packageDir = (
            None
            if packageName in ("", "None") else
            os.path.join(destination, packageName)
        )
        pluginFile = os.path.join(destination, pluginFileName)
        
        with contextlib.suppress(OSError, os.error):
            if packageDir and os.path.exists(packageDir):
                shutil.rmtree(packageDir)
            
            fnameo = "{0}o".format(pluginFile)
            if os.path.exists(fnameo):
                os.remove(fnameo)
            
            fnamec = "{0}c".format(pluginFile)
            if os.path.exists(fnamec):
                os.remove(fnamec)
            
            pluginDirCache = os.path.join(
                os.path.dirname(pluginFile), "__pycache__")
            if os.path.exists(pluginDirCache):
                pluginFileName = os.path.splitext(
                    os.path.basename(pluginFile))[0]
                for fnameo in glob.glob(
                    os.path.join(pluginDirCache,
                                 "{0}*.pyo".format(pluginFileName))):
                    os.remove(fnameo)
                for fnamec in glob.glob(
                    os.path.join(pluginDirCache,
                                 "{0}*.pyc".format(pluginFileName))):
                    os.remove(fnamec)
            
            os.remove(pluginFile)


class PluginInstallDialog(QDialog):
    """
    Class for the dialog variant.
    """
    def __init__(self, pluginManager, pluginFileNames, parent=None):
        """
        Constructor
        
        @param pluginManager reference to the plugin manager object
        @param pluginFileNames list of plugin files suggested for
            installation (list of strings)
        @param parent reference to the parent widget (QWidget)
        """
        super().__init__(parent)
        self.setSizeGripEnabled(True)
        
        self.__layout = QVBoxLayout(self)
        self.__layout.setContentsMargins(0, 0, 0, 0)
        self.setLayout(self.__layout)
        
        self.cw = PluginInstallWidget(pluginManager, pluginFileNames, self)
        size = self.cw.size()
        self.__layout.addWidget(self.cw)
        self.resize(size)
        self.setWindowTitle(self.cw.windowTitle())
        
        self.cw.buttonBox.accepted.connect(self.accept)
        self.cw.buttonBox.rejected.connect(self.reject)
    
    def restartNeeded(self):
        """
        Public method to check, if a restart of the IDE is required.
        
        @return flag indicating a restart is required (boolean)
        """
        return self.cw.restartNeeded()


class PluginInstallWindow(EricMainWindow):
    """
    Main window class for the standalone dialog.
    """
    def __init__(self, pluginFileNames, parent=None):
        """
        Constructor
        
        @param pluginFileNames list of plugin files suggested for
            installation (list of strings)
        @param parent reference to the parent widget (QWidget)
        """
        super().__init__(parent)
        self.cw = PluginInstallWidget(None, pluginFileNames, self)
        size = self.cw.size()
        self.setCentralWidget(self.cw)
        self.resize(size)
        self.setWindowTitle(self.cw.windowTitle())
        
        self.setStyle(Preferences.getUI("Style"),
                      Preferences.getUI("StyleSheet"))
        
        self.cw.buttonBox.accepted.connect(self.close)
        self.cw.buttonBox.rejected.connect(self.close)
