# -*- coding: utf-8 -*-
"""
A window with a textfield where the user can edit.

Useful for editing the contents of an article.
"""
#
# (C) Pywikibot team, 2003-2020
#
# Distributed under the terms of the MIT license.
#
import tkinter
from tkinter.scrolledtext import ScrolledText
from tkinter import simpledialog as tkSimpleDialog
from typing import Optional

import pywikibot

from pywikibot import __url__
from pywikibot.backports import Tuple
from pywikibot.tools import PYTHON_VERSION


# T164163: Fix idlelib import in Python 3.6
if PYTHON_VERSION >= (3, 6):
    from idlelib import (
        search as SearchDialog,
        replace as ReplaceDialog,
    )
    from idlelib.config import idleConf
    from idlelib.configdialog import ConfigDialog
    from idlelib.multicall import MultiCallCreator
else:
    from idlelib import SearchDialog, ReplaceDialog
    from idlelib.configDialog import ConfigDialog
    from idlelib.configHandler import idleConf
    from idlelib.MultiCall import MultiCallCreator


class TextEditor(ScrolledText):

    """A text widget with some editing enhancements.

    A lot of code here is copied or adapted from the idlelib/EditorWindow.py
    file in the standard Python distribution.

    """

    def __init__(self, master=None, **kwargs):
        """
        Initializer.

        Get default settings from user's IDLE configuration.
        """
        textcf = self._initialize_config(idleConf.CurrentTheme())

        if idleConf.GetOption('main', 'EditorWindow', 'font-bold',
                              type='bool'):
            font_weight = 'bold'
        else:
            font_weight = 'normal'
        textcf['font'] = (
            idleConf.GetOption('main', 'EditorWindow', 'font'),
            idleConf.GetOption('main', 'EditorWindow', 'font-size'),
            font_weight)

        # override defaults with any user-specified settings
        textcf.update(kwargs)
        super().__init__(master, **textcf)

    def _initialize_config(self, Theme):
        """Fix idleConf.GetHighlight method for different Python releases."""
        config = {
            'padx': 5,
            'wrap': 'word',
            'undo': 'True',
            'width': idleConf.GetOption('main', 'EditorWindow', 'width'),
            'height': idleConf.GetOption('main', 'EditorWindow', 'height'),
        }
        if PYTHON_VERSION >= (3, 7, 4):  # T241216
            config['foreground'] = idleConf.GetHighlight(
                Theme, 'normal')['foreground']
            config['background'] = idleConf.GetHighlight(
                Theme, 'normal')['background']
            config['highlightcolor'] = idleConf.GetHighlight(
                Theme, 'hilite')['foreground']
            config['highlightbackground'] = idleConf.GetHighlight(
                Theme, 'hilite')['background']
            config['insertbackground'] = idleConf.GetHighlight(
                Theme, 'cursor')['foreground']
        else:
            config['foreground'] = idleConf.GetHighlight(
                Theme, 'normal', fgBg='fg')
            config['background'] = idleConf.GetHighlight(
                Theme, 'normal', fgBg='bg')
            config['highlightcolor'] = idleConf.GetHighlight(
                Theme, 'hilite', fgBg='fg')
            config['highlightbackground'] = idleConf.GetHighlight(
                Theme, 'hilite', fgBg='bg')
            config['insertbackground'] = idleConf.GetHighlight(
                Theme, 'cursor', fgBg='fg')
        return config

    def add_bindings(self):
        """Assign key and events bindings to methods."""
        # due to IDLE dependencies, this can't be called from __init__
        # add key and event bindings
        self.bind('<<cut>>', self.cut)
        self.bind('<<copy>>', self.copy)
        self.bind('<<paste>>', self.paste)
        self.bind('<<select-all>>', self.select_all)
        self.bind('<<remove-selection>>', self.remove_selection)
        self.bind('<<find>>', self.find_event)
        self.bind('<<find-again>>', self.find_again_event)
        self.bind('<<find-selection>>', self.find_selection_event)
        self.bind('<<replace>>', self.replace_event)
        self.bind('<<goto-line>>', self.goto_line_event)
        self.bind('<<del-word-left>>', self.del_word_left)
        self.bind('<<del-word-right>>', self.del_word_right)
        keydefs = {'<<copy>>': ['<Control-Key-c>', '<Control-Key-C>'],
                   '<<cut>>': ['<Control-Key-x>', '<Control-Key-X>'],
                   '<<del-word-left>>': ['<Control-Key-BackSpace>'],
                   '<<del-word-right>>': ['<Control-Key-Delete>'],
                   '<<end-of-file>>': ['<Control-Key-d>', '<Control-Key-D>'],
                   '<<find-again>>': ['<Control-Key-g>', '<Key-F3>'],
                   '<<find-selection>>': ['<Control-Key-F3>'],
                   '<<find>>': ['<Control-Key-f>', '<Control-Key-F>'],
                   '<<goto-line>>': ['<Alt-Key-g>', '<Meta-Key-g>'],
                   '<<paste>>': ['<Control-Key-v>', '<Control-Key-V>'],
                   '<<redo>>': ['<Control-Shift-Key-Z>'],
                   '<<remove-selection>>': ['<Key-Escape>'],
                   '<<replace>>': ['<Control-Key-h>', '<Control-Key-H>'],
                   '<<select-all>>': ['<Control-Key-a>'],
                   '<<undo>>': ['<Control-Key-z>', '<Control-Key-Z>'],
                   }

        for event, keylist in keydefs.items():
            if keylist:
                self.event_add(event, *keylist)

    def cut(self, event):
        """Perform cut operation."""
        if self.tag_ranges('sel'):
            self.event_generate('<<Cut>>')
        return 'break'

    def copy(self, event):
        """Perform copy operation."""
        if self.tag_ranges('sel'):
            self.event_generate('<<Copy>>')
        return 'break'

    def paste(self, event):
        """Perform paste operation."""
        self.event_generate('<<Paste>>')
        return 'break'

    def select_all(self, event=None):
        """Perform select all operation."""
        self.tag_add('sel', '1.0', 'end-1c')
        self.mark_set('insert', '1.0')
        self.see('insert')
        return 'break'

    def remove_selection(self, event=None):
        """Perform remove operation."""
        self.tag_remove('sel', '1.0', 'end')
        self.see('insert')

    def del_word_left(self, event):
        """Perform delete word (left) operation."""
        self.event_generate('<Meta-Delete>')
        return 'break'

    def del_word_right(self, event=None):
        """Perform delete word (right) operation."""
        self.event_generate('<Meta-d>')
        return 'break'

    def find_event(self, event=None):
        """Perform find operation."""
        if not self.tag_ranges('sel'):
            found = self.tag_ranges('found')
            if found:
                self.tag_add('sel', found[0], found[1])
            else:
                self.tag_add('sel', '1.0', '1.0+1c')
        SearchDialog.find(self)
        return 'break'

    def find_again_event(self, event=None):
        """Perform find again operation."""
        SearchDialog.find_again(self)
        return 'break'

    def find_selection_event(self, event=None):
        """Perform find selection operation."""
        SearchDialog.find_selection(self)
        return 'break'

    def replace_event(self, event=None):
        """Perform replace operation."""
        ReplaceDialog.replace(self)
        return 'break'

    def find_all(self, s):
        """
        Highlight all occurrences of string s, and select the first one.

        If the string has already been highlighted, jump to the next occurrence
        after the current selection. (You cannot go backwards using the
        button, but you can manually place the cursor anywhere in the
        document to start searching from that point.)

        """
        if hasattr(self, '_highlight') and self._highlight == s:
            try:
                if self.get(tkinter.SEL_FIRST, tkinter.SEL_LAST) == s:
                    return self.find_selection_event(None)
                # user must have changed the selection
                found = self.tag_nextrange('found', tkinter.SEL_LAST)
            except tkinter.TclError:
                # user must have unset the selection
                found = self.tag_nextrange('found', tkinter.INSERT)
            if not found:
                # at last occurrence, scroll back to the top
                found = self.tag_nextrange('found', 1.0)
            if found:
                self.do_highlight(found[0], found[1])
        else:
            # find all occurrences of string s;
            # adapted from O'Reilly's Python in a Nutshell
            # remove previous uses of tag 'found', if any
            self.tag_remove('found', '1.0', tkinter.END)
            if s:
                self._highlight = s
                # start from the beginning (and when we come to the end, stop)
                idx = '1.0'
                while True:
                    # find next occurrence, exit loop if no more
                    idx = self.search(s, idx, nocase=1, stopindex=tkinter.END)
                    if not idx:
                        break
                    # index right after the end of the occurrence
                    lastidx = '%s+%dc' % (idx, len(s))
                    # tag the whole occurrence (start included, stop excluded)
                    self.tag_add('found', idx, lastidx)
                    # prepare to search for next occurrence
                    idx = lastidx
                # use a red foreground for all the tagged occurrences
                self.tag_config('found', foreground='red')
                found = self.tag_nextrange('found', 1.0)
                if found:
                    self.do_highlight(found[0], found[1])
        return None

    def do_highlight(self, start, end):
        """Select and show the text from index start to index end."""
        self.see(start)
        self.tag_remove(tkinter.SEL, '1.0', tkinter.END)
        self.tag_add(tkinter.SEL, start, end)
        self.focus_set()

    def goto_line_event(self, event):
        """Perform goto line operation."""
        lineno = tkSimpleDialog.askinteger('Goto', 'Go to line number:',
                                           parent=self)
        if lineno is None:
            return 'break'
        if lineno <= 0:
            self.bell()
            return 'break'
        self.mark_set('insert', '%d.0' % lineno)
        self.see('insert')
        return None


class EditBoxWindow(tkinter.Frame):

    """Edit box window."""

    def __init__(self, parent=None, **kwargs):
        """Initializer."""
        if parent is None:
            # create a new window
            parent = tkinter.Tk()
        self.parent = parent
        super().__init__(parent)
        self.editbox = MultiCallCreator(TextEditor)(self, **kwargs)
        self.editbox.pack(side=tkinter.TOP)
        self.editbox.add_bindings()
        self.bind('<<open-config-dialog>>', self.config_dialog)

        bottom = tkinter.Frame(parent)
        # lower left subframe with a textfield and a Search button
        bottom_left_frame = tkinter.Frame(bottom)
        self.textfield = tkinter.Entry(bottom_left_frame)
        self.textfield.pack(side=tkinter.LEFT, fill=tkinter.X, expand=1)

        buttonSearch = tkinter.Button(bottom_left_frame, text='Find next',
                                      command=self.find)
        buttonSearch.pack(side=tkinter.RIGHT)
        bottom_left_frame.pack(side=tkinter.LEFT, expand=1)

        # lower right subframe which will contain OK and Cancel buttons
        bottom_right_frame = tkinter.Frame(bottom)

        buttonOK = tkinter.Button(bottom_right_frame, text='OK',
                                  command=self.pressedOK)
        buttonCancel = tkinter.Button(bottom_right_frame, text='Cancel',
                                      command=parent.destroy)
        buttonOK.pack(side=tkinter.LEFT, fill=tkinter.X)
        buttonCancel.pack(side=tkinter.RIGHT, fill=tkinter.X)
        bottom_right_frame.pack(side=tkinter.RIGHT, expand=1)

        bottom.pack(side=tkinter.TOP)

        # create a toplevel menu
        menubar = tkinter.Menu(self.parent)

        findmenu = tkinter.Menu(menubar)
        findmenu.add_command(label='Find',
                             command=self.editbox.find_event,
                             accelerator='Ctrl+F',
                             underline=0)
        findmenu.add_command(label='Find again',
                             command=self.editbox.find_again_event,
                             accelerator='Ctrl+G',
                             underline=6)
        findmenu.add_command(label='Find all',
                             command=self.find_all,
                             underline=5)
        findmenu.add_command(label='Find selection',
                             command=self.editbox.find_selection_event,
                             accelerator='Ctrl+F3',
                             underline=5)
        findmenu.add_command(label='Replace',
                             command=self.editbox.replace_event,
                             accelerator='Ctrl+H',
                             underline=0)
        menubar.add_cascade(label='Find', menu=findmenu, underline=0)

        editmenu = tkinter.Menu(menubar)
        editmenu.add_command(label='Cut',
                             command=self.editbox.cut,
                             accelerator='Ctrl+X',
                             underline=2)
        editmenu.add_command(label='Copy',
                             command=self.editbox.copy,
                             accelerator='Ctrl+C',
                             underline=0)
        editmenu.add_command(label='Paste',
                             command=self.editbox.paste,
                             accelerator='Ctrl+V',
                             underline=0)
        editmenu.add_separator()
        editmenu.add_command(label='Select all',
                             command=self.editbox.select_all,
                             accelerator='Ctrl+A',
                             underline=7)
        editmenu.add_command(label='Clear selection',
                             command=self.editbox.remove_selection,
                             accelerator='Esc')
        menubar.add_cascade(label='Edit', menu=editmenu, underline=0)

        optmenu = tkinter.Menu(menubar)
        optmenu.add_command(label='Settings...',
                            command=self.config_dialog,
                            underline=0)
        menubar.add_cascade(label='Options', menu=optmenu, underline=0)

        # display the menu
        self.parent.config(menu=menubar)
        self.pack()

    def edit(self, text: str, jumpIndex: Optional[int] = None,
             highlight: Optional[str] = None):
        """
        Provide user with editor to modify text.

        @param text: the text to be edited
        @param jumpIndex: position at which to put the caret
        @param highlight: each occurrence of this substring will be highlighted
        @return: the modified text, or None if the user didn't save the text
            file in his text editor
        @rtype: str or None
        """
        self.text = None
        # put given text into our textarea
        self.editbox.insert(tkinter.END, text)
        # wait for user to push a button which will destroy (close) the window
        # enable word wrap
        self.editbox.tag_add('all', '1.0', tkinter.END)
        self.editbox.tag_config('all', wrap=tkinter.WORD)
        # start search if required
        if highlight:
            self.find_all(highlight)
        if jumpIndex:
            # lines are indexed starting at 1
            line = text[:jumpIndex].count('\n') + 1
            column = jumpIndex - (text[:jumpIndex].rfind('\n') + 1)
            # don't know how to place the caret, but scrolling to the right
            # line should already be helpful.
            self.editbox.see('%d.%d' % (line, column))
        # wait for user to push a button which will destroy (close) the window
        self.parent.mainloop()
        return self.text

    def find_all(self, target):
        """Perform find all operation."""
        self.textfield.insert(tkinter.END, target)
        self.editbox.find_all(target)

    def find(self):
        """Perform find operation."""
        # get text to search for
        s = self.textfield.get()
        if s:
            self.editbox.find_all(s)

    def config_dialog(self, event=None):
        """Show config dialog."""
        ConfigDialog(self, 'Settings')

    def pressedOK(self):
        """
        Perform OK operation.

        Called when user pushes the OK button.
        Saves the buffer into a variable, and closes the window.
        """
        self.text = self.editbox.get('1.0', tkinter.END)
        self.parent.destroy()

    def debug(self, event=None):
        """Call quit() and return 'break'."""
        self.quit()
        return 'break'


# the following class isn't used anywhere in the framework: ####
class ListBoxWindow:

    """List box window."""

    # called when user pushes the OK button.
    # closes the window.
    def pressedOK(self):
        """
        Perform OK operation.

        Closes listbox.
        """
        self.parent.destroy()

    def __init__(self, parent=None):
        """Initializer."""
        if parent is None:
            # create a new window
            parent = tkinter.Tk()
        self.parent = parent

        # selectable: only one item
        self.listbox = tkinter.Listbox(parent, selectmode=tkinter.SINGLE)
        # put list into main frame, using all available space
        self.listbox.pack(anchor=tkinter.CENTER, fill=tkinter.BOTH)

        # lower subframe which will contain one button
        self.bottom_frame = tkinter.Frame(parent)
        self.bottom_frame.pack(side=tkinter.BOTTOM)

        buttonOK = tkinter.Button(self.bottom_frame, text='OK',
                                  command=self.pressedOK)
        buttonOK.pack(side=tkinter.LEFT, fill=tkinter.X)
        # idea: set title to cur_disambiguation

    def list(self, list):
        """Put list of alternatives into listbox."""
        self.list = list
        # find required area
        laenge = len(list)
        maxbreite = 0
        for i in range(laenge):
            # cycle through all listitems to find maxlength
            if len(list[i]) + len(str(i)) > maxbreite:
                maxbreite = len(list[i]) + len(str(i))
            # show list as formerly in DOS-window
            self.listbox.insert(tkinter.END, str(i) + ' - ' + list[i])
        # set optimized height & width
        self.listbox.config(height=laenge, width=maxbreite + 2)
        # wait for user to push a button which will destroy (close) the window
        return self.list


class Tkdialog:

    """The dialog window for image info."""

    def __init__(self, photo_description, photo, filename):
        """Initializer."""
        self.root = tkinter.Tk()
        # "%dx%d%+d%+d" % (width, height, xoffset, yoffset)
        self.root.geometry('%ix%i+10-10' % (pywikibot.config.tkhorsize,
                                            pywikibot.config.tkvertsize))

        self.root.title(filename)
        self.photo_description = photo_description
        self.filename = filename
        self.photo = photo
        self.skip = False
        self.exit = False

        # --Init of the widgets
        # The image
        self.image = self.get_image(self.photo, 800, 600)
        self.image_panel = tkinter.Label(self.root, image=self.image)

        self.image_panel.image = self.image

        # The filename
        self.filename_label = tkinter.Label(self.root,
                                            text='Suggested filename')
        self.filename_field = tkinter.Entry(self.root, width=100)
        self.filename_field.insert(tkinter.END, filename)

        # The description
        self.description_label = tkinter.Label(self.root,
                                               text='Suggested description')
        self.description_scrollbar = tkinter.Scrollbar(self.root,
                                                       orient=tkinter.VERTICAL)
        self.description_field = tkinter.Text(self.root)
        self.description_field.insert(tkinter.END, photo_description)
        self.description_field.config(
            state=tkinter.NORMAL, height=12, width=100, padx=0, pady=0,
            wrap=tkinter.WORD, yscrollcommand=self.description_scrollbar.set)
        self.description_scrollbar.config(command=self.description_field.yview)

        # The buttons
        self.ok_button = tkinter.Button(self.root, text='OK',
                                        command=self.ok_file)
        self.skip_button = tkinter.Button(self.root, text='Skip',
                                          command=self.skip_file)

        # --Start grid

        # The image
        self.image_panel.grid(row=0, column=0, rowspan=11, columnspan=4)

        # The buttons
        self.ok_button.grid(row=11, column=1, rowspan=2)
        self.skip_button.grid(row=11, column=2, rowspan=2)

        # The filename
        self.filename_label.grid(row=13, column=0)
        self.filename_field.grid(row=13, column=1, columnspan=3)

        # The description
        self.description_label.grid(row=14, column=0)
        self.description_field.grid(row=14, column=1, columnspan=3)
        self.description_scrollbar.grid(row=14, column=5)

    def get_image(self, photo, width, height):
        """Take the BytesIO object and build an imageTK thumbnail."""
        try:
            from PIL import Image, ImageTk
        except ImportError:
            pywikibot.warning('This script requires ImageTk from the'
                              'Python Imaging Library (PIL).\n'
                              'See: {0}/flickrripper.py'.format(__url__))
            raise

        image = Image.open(photo)
        image.thumbnail((width, height))
        imageTk = ImageTk.PhotoImage(image)
        return imageTk

    def ok_file(self):
        """The user pressed the OK button."""
        self.filename = self.filename_field.get()
        self.photo_description = self.description_field.get(0.0, tkinter.END)
        self.root.destroy()

    def skip_file(self):
        """The user pressed the Skip button."""
        self.skip = True
        self.root.destroy()

    def show_dialog(self) -> Tuple[str, str, bool]:
        """Activate the dialog.

        @return: new description, name, and if the image is skipped
        """
        self.root.mainloop()
        return self.photo_description, self.filename, self.skip
