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

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

"""
Module implementing the Icons configuration page.
"""

import os

from PyQt5.QtCore import pyqtSlot
from PyQt5.QtWidgets import QListWidgetItem

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

from .ConfigurationPageBase import ConfigurationPageBase
from .Ui_IconsPage import Ui_IconsPage

import Preferences

from eric6config import getConfig


class IconsPage(ConfigurationPageBase, Ui_IconsPage):
    """
    Class implementing the Icons configuration page.
    """
    def __init__(self):
        """
        Constructor
        """
        super(IconsPage, self).__init__()
        self.setupUi(self)
        self.setObjectName("IconsPage")
        
        self.iconDirectoryPicker.setMode(E5PathPickerModes.DirectoryMode)
        
        # set initial values
        defaultIconsPath = Preferences.getIcons("DefaultIconsPath")
        if defaultIconsPath == "automatic":
            self.defaultAutomaticButton.setChecked(True)
        elif defaultIconsPath == "breeze-light":
            self.defaultBreezeLightButton.setChecked(True)
        elif defaultIconsPath == "breeze-dark":
            self.defaultBreezeDarkButton.setChecked(True)
        else:
            self.defaultOxygenButton.setChecked(True)
        
        dirList = Preferences.getIcons("Path")[:]
        for directory in dirList:
            if directory:
                QListWidgetItem(directory, self.iconDirectoryList)
        
    def save(self):
        """
        Public slot to save the Icons configuration.
        """
        Preferences.setIcons("DefaultIconsPath",
                             self.__getSelectedDefaultIconsPath())
        
        dirList = []
        for i in range(self.iconDirectoryList.count()):
            dirList.append(self.iconDirectoryList.item(i).text())
        Preferences.setIcons("Path", dirList)
    
    def __getSelectedDefaultIconsPath(self):
        """
        Private method to determine the selected default icons path.
        
        @return selected default icons path
        @rtype str
        """
        if self.defaultAutomaticButton.isChecked():
            return "automatic"
        elif self.defaultBreezeLightButton.isChecked():
            return "breeze-light"
        elif self.defaultBreezeDarkButton.isChecked():
            return "breeze-dark"
        else:
            return "oxygen"
    
    def on_iconDirectoryList_currentRowChanged(self, row):
        """
        Private slot to handle the currentRowChanged signal of the icons
        directory list.
        
        @param row the current row (integer)
        """
        if row == -1:
            self.deleteIconDirectoryButton.setEnabled(False)
            self.upButton.setEnabled(False)
            self.downButton.setEnabled(False)
            self.showIconsButton.setEnabled(
                self.iconDirectoryPicker.text() != "")
        else:
            maxIndex = self.iconDirectoryList.count() - 1
            self.upButton.setEnabled(row != 0)
            self.downButton.setEnabled(row != maxIndex)
            self.deleteIconDirectoryButton.setEnabled(True)
            self.showIconsButton.setEnabled(True)
        
    def on_iconDirectoryPicker_textChanged(self, txt):
        """
        Private slot to handle the textChanged signal of the directory picker.
        
        @param txt the text of the directory picker (string)
        """
        self.addIconDirectoryButton.setEnabled(txt != "")
        self.showIconsButton.setEnabled(
            txt != "" or
            self.iconDirectoryList.currentRow() != -1)
        
    @pyqtSlot()
    def on_upButton_clicked(self):
        """
        Private slot called to move the selected item up in the list.
        """
        row = self.iconDirectoryList.currentRow()
        if row == 0:
            # we're already at the top
            return
        
        itm = self.iconDirectoryList.takeItem(row)
        self.iconDirectoryList.insertItem(row - 1, itm)
        self.iconDirectoryList.setCurrentItem(itm)
        if row == 1:
            self.upButton.setEnabled(False)
        else:
            self.upButton.setEnabled(True)
        self.downButton.setEnabled(True)
        
    @pyqtSlot()
    def on_downButton_clicked(self):
        """
        Private slot called to move the selected item down in the list.
        """
        rows = self.iconDirectoryList.count()
        row = self.iconDirectoryList.currentRow()
        if row == rows - 1:
            # we're already at the end
            return
        
        itm = self.iconDirectoryList.takeItem(row)
        self.iconDirectoryList.insertItem(row + 1, itm)
        self.iconDirectoryList.setCurrentItem(itm)
        self.upButton.setEnabled(True)
        if row == rows - 2:
            self.downButton.setEnabled(False)
        else:
            self.downButton.setEnabled(True)
        
    @pyqtSlot()
    def on_addIconDirectoryButton_clicked(self):
        """
        Private slot to add the icon directory displayed to the listbox.
        """
        directory = self.iconDirectoryPicker.text()
        if directory:
            QListWidgetItem(directory, self.iconDirectoryList)
            self.iconDirectoryPicker.clear()
        row = self.iconDirectoryList.currentRow()
        self.on_iconDirectoryList_currentRowChanged(row)
        
    @pyqtSlot()
    def on_deleteIconDirectoryButton_clicked(self):
        """
        Private slot to delete the currently selected directory of the listbox.
        """
        row = self.iconDirectoryList.currentRow()
        itm = self.iconDirectoryList.takeItem(row)
        del itm
        row = self.iconDirectoryList.currentRow()
        self.on_iconDirectoryList_currentRowChanged(row)
        
    @pyqtSlot()
    def on_showIconsButton_clicked(self):
        """
        Private slot to display a preview of an icons directory.
        """
        directory = self.iconDirectoryPicker.text()
        if directory:
            directories = [directory]
        else:
            directories = []
            for row in range(self.iconDirectoryList.count()):
                directories.append(self.iconDirectoryList.item(row).text())
        if directories:
            from .IconsPreviewDialog import IconsPreviewDialog
            dlg = IconsPreviewDialog(directories, self)
            dlg.exec_()
    
    @pyqtSlot()
    def on_showDefaultIconsButton_clicked(self):
        """
        Private slot to display a preview of the selected default icons.
        """
        defaultIconsPath = self.__getSelectedDefaultIconsPath()
        if defaultIconsPath == "automatic":
            if e5App().usesDarkPalette():
                defaultIconsPath = "breeze-dark"
            else:
                defaultIconsPath = "breeze-light"
        
        from .IconsPreviewDialog import IconsPreviewDialog
        dlg = IconsPreviewDialog([
            os.path.join(getConfig('ericIconDir'), defaultIconsPath),
            os.path.join(getConfig('ericIconDir'), defaultIconsPath,
                         "languages"),
        ], self)
        dlg.exec_()


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 = IconsPage()
    return page
