from kivy.app import App
from kivy.extras.highlight import KivyLexer
from kivy.uix.spinner import Spinner, SpinnerOption
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.codeinput import CodeInput
from kivy.uix.behaviors import EmacsBehavior
from kivy.uix.popup import Popup
from kivy.properties import ListProperty
from kivy.core.window import Window
from kivy.core.text import LabelBase
from pygments import lexers
import codecs
import os

example_text = '''
---------------------Python----------------------------------
import kivy
kivy.require('1.0.6') # replace with your current kivy version !
from kivy.app import App
from kivy.uix.button import Button

class MyApp(App):
    def build(self):
        return Button(text='Hello World')

if __name__ == '__main__':
    MyApp().run()
----------------------Java-----------------------------------

public static byte toUnsignedByte(int intVal) {
    byte byteVal;
    return (byte)(intVal & 0xFF);
}
---------------------kv lang---------------------------------
#:kivy 1.0

<YourWidget>:
    canvas:
        Color:
            rgb: .5, .5, .5
        Rectangle:
            pos: self.pos
            size: self.size
---------------------HTML------------------------------------
<!-- Place this tag where you want the +1 button to render. -->
<div class="g-plusone" data-annotation="inline" data-width="300"></div>

<!-- Place this tag after the last +1 button tag. -->
<script type="text/javascript">
  (function() {
    var po = document.createElement('script');
    po.type = 'text/javascript';
    po.async = true;
    po.src = 'https://apis.google.com/js/plusone.js';
    var s = document.getElementsByTagName('script')[0];
    s.parentNode.insertBefore(po, s);
  })();
</script>
----------------------Emacs key bindings---------------------
This CodeInput inherits from EmacsBehavior, so you can use Emacs key bindings
if you want! To try out Emacs key bindings, set the "Key bindings" option to
"Emacs". Experiment with the shortcuts below on some of the text in this window
(just be careful not to delete the cheat sheet before you have made note of the
commands!)

Shortcut           Description
--------           -----------
Control + a        Move cursor to the beginning of the line
Control + e        Move cursor to the end of the line
Control + f        Move cursor one character to the right
Control + b        Move cursor one character to the left
Alt + f            Move cursor to the end of the word to the right
Alt + b            Move cursor to the start of the word to the left
Alt + Backspace    Delete text left of the cursor to the beginning of word
Alt + d            Delete text right of the cursor to the end of the word
Alt + w            Copy selection
Control + w        Cut selection
Control + y        Paste selection
'''


class Fnt_SpinnerOption(SpinnerOption):
    pass


class LoadDialog(Popup):

    def load(self, path, selection):
        self.choosen_file = [None, ]
        self.choosen_file = selection
        Window.title = selection[0][selection[0].rfind(os.sep) + 1:]
        self.dismiss()

    def cancel(self):
        self.dismiss()


class SaveDialog(Popup):

    def save(self, path, selection):
        _file = codecs.open(selection, 'w', encoding='utf8')
        _file.write(self.text)
        Window.title = selection[selection.rfind(os.sep) + 1:]
        _file.close()
        self.dismiss()

    def cancel(self):
        self.dismiss()


class CodeInputWithBindings(EmacsBehavior, CodeInput):
    '''CodeInput with keybindings.
    To add more bindings, add the behavior before CodeInput in the class
    definition.
    '''
    pass


class CodeInputTest(App):

    files = ListProperty([None, ])

    def build(self):
        b = BoxLayout(orientation='vertical')
        languages = Spinner(
            text='language',
            values=sorted(['KvLexer', ] + list(lexers.LEXERS.keys())))

        languages.bind(text=self.change_lang)

        menu = BoxLayout(
            size_hint_y=None,
            height='30pt')
        fnt_size = Spinner(
            text='12',
            values=list(map(str, list(range(5, 40)))))
        fnt_size.bind(text=self._update_size)

        fonts = [
            file for file in LabelBase._font_dirs_files
            if file.endswith('.ttf')]

        fnt_name = Spinner(
            text='RobotoMono',
            option_cls=Fnt_SpinnerOption,
            values=fonts)
        fnt_name.bind(text=self._update_font)
        mnu_file = Spinner(
            text='File',
            values=('Open', 'SaveAs', 'Save', 'Close'))
        mnu_file.bind(text=self._file_menu_selected)
        key_bindings = Spinner(
            text='Key bindings',
            values=('Default key bindings', 'Emacs key bindings'))
        key_bindings.bind(text=self._bindings_selected)

        menu.add_widget(mnu_file)
        menu.add_widget(fnt_size)
        menu.add_widget(fnt_name)
        menu.add_widget(languages)
        menu.add_widget(key_bindings)
        b.add_widget(menu)

        self.codeinput = CodeInputWithBindings(
            lexer=KivyLexer(),
            font_size=12,
            text=example_text,
            key_bindings='default',
        )

        b.add_widget(self.codeinput)

        return b

    def _update_size(self, instance, size):
        self.codeinput.font_size = float(size)

    def _update_font(self, instance, fnt_name):
        instance.font_name = self.codeinput.font_name = fnt_name

    def _file_menu_selected(self, instance, value):
        if value == 'File':
            return
        instance.text = 'File'
        if value == 'Open':
            if not hasattr(self, 'load_dialog'):
                self.load_dialog = LoadDialog()
            self.load_dialog.open()
            self.load_dialog.bind(choosen_file=self.setter('files'))
        elif value == 'SaveAs':
            if not hasattr(self, 'saveas_dialog'):
                self.saveas_dialog = SaveDialog()
            self.saveas_dialog.text = self.codeinput.text
            self.saveas_dialog.open()
        elif value == 'Save':
            if self.files[0]:
                _file = codecs.open(self.files[0], 'w', encoding='utf8')
                _file.write(self.codeinput.text)
                _file.close()
        elif value == 'Close':
            if self.files[0]:
                self.codeinput.text = ''
                Window.title = 'untitled'

    def _bindings_selected(self, instance, value):
        value = value.split(' ')[0]
        self.codeinput.key_bindings = value.lower()

    def on_files(self, instance, values):
        if not values[0]:
            return
        _file = codecs.open(values[0], 'r', encoding='utf8')
        self.codeinput.text = _file.read()
        _file.close()

    def change_lang(self, instance, z):
        if z == 'KvLexer':
            lx = KivyLexer()
        else:
            lx = lexers.get_lexer_by_name(lexers.LEXERS[z][2][0])
        self.codeinput.lexer = lx


if __name__ == '__main__':
    CodeInputTest().run()