#!/usr/bin/env python3
# -*- coding: utf-8 -*-

# Fenrir TTY screen reader
# By Chrys, Storm Dragon, and contributers.

from fenrirscreenreader.core import debug
from fenrirscreenreader.core.i18n import _


class HelpManager():
    def __init__(self):
        self.helpDict = {}
        self.tutorialListIndex = None

    def initialize(self, environment):
        self.env = environment

    def shutdown(self):
        pass

    def toggle_tutorial_mode(self):
        self.set_tutorial_mode(not self.env['general']['tutorialMode'])

    def set_tutorial_mode(self, newTutorialMode):
        if self.env['runtime']['VmenuManager'].get_active():
            return
        self.env['general']['tutorialMode'] = newTutorialMode
        if newTutorialMode:
            self.create_help_dict()
            self.env['bindings'][str([1, ['KEY_ESC']])
                                 ] = 'TOGGLE_TUTORIAL_MODE'
            self.env['bindings'][str([1, ['KEY_UP']])] = 'PREV_HELP'
            self.env['bindings'][str([1, ['KEY_DOWN']])] = 'NEXT_HELP'
            self.env['bindings'][str([1, ['KEY_SPACE']])] = 'CURR_HELP'
        else:
            try:
                self.env['bindings'] = self.env['runtime']['SettingsManager'].get_binding_backup(
                )
            except Exception as e:
                self.env['runtime']['DebugManager'].write_debug_out(
                    'HelpManager set_tutorial_mode: Error restoring binding backup: ' + str(e),
                    debug.DebugLevel.ERROR)

    def is_tutorial_mode(self):
        return self.env['general']['tutorialMode']

    def get_formatted_shortcut_for_command(self, command):
        shortcut = []
        raw_shortcut = []
        try:
            raw_shortcut = list(self.env['bindings'].keys())[
                list(self.env['bindings'].values()).index(command)]
            raw_shortcut = self.env['rawBindings'][raw_shortcut]
            # prefer numbers for multitap
            if raw_shortcut[0] in range(2, 9):
                formatted_key = str(raw_shortcut[0]) + ' times '
                shortcut.append(formatted_key)
            # prefer metha keys
            for k in [
                'KEY_FENRIR',
                'KEY_SCRIPT',
                'KEY_CTRL',
                'KEY_SHIFT',
                'KEY_ALT',
                    'KEY_META']:
                if k in raw_shortcut[1]:
                    formatted_key = k
                    formatted_key = formatted_key.lower()
                    formatted_key = formatted_key.replace('key_kp', ' keypad ')
                    formatted_key = formatted_key.replace('key_', ' ')
                    shortcut.append(formatted_key)
                    raw_shortcut[1].remove(k)
            # handle other keys
            for k in raw_shortcut[1]:
                formatted_key = k
                formatted_key = formatted_key.lower()
                formatted_key = formatted_key.replace('key_kp', ' keypad ')
                formatted_key = formatted_key.replace('key_', ' ')
                shortcut.append(formatted_key)
        except Exception as e:
            return ''
        shortcut = str(shortcut)
        shortcut = shortcut.replace('[', '')
        shortcut = shortcut.replace(']', '')
        shortcut = shortcut.replace("'", '')
        return shortcut

    def get_command_help_text(self, command, section='commands'):
        command_name = command.lower()
        command_name = command_name.split('__-__')[0]
        command_name = command_name.replace('_', ' ')
        command_name = command_name.replace('_', ' ')
        if command == 'TOGGLE_TUTORIAL_MODE':
            command_description = _('toggles the tutorial mode')
        else:
            command_description = self.env['runtime']['CommandManager'].get_command_description(
                command, section='commands')
        if command_description == '':
            command_description = 'no Description available'
        command_shortcut = self.get_formatted_shortcut_for_command(command)
        if command_shortcut == '':
            command_shortcut = 'unbound'
        helptext = command_name + ', Shortcut ' + \
            command_shortcut + ', Description ' + command_description
        return helptext

    def create_help_dict(self, section='commands'):
        self.helpDict = {}
        for command in sorted(self.env['commands'][section].keys()):
            self.helpDict[len(self.helpDict)] = self.get_command_help_text(
                command, section)
        if len(self.helpDict) > 0:
            self.tutorialListIndex = 0
        else:
            self.tutorialListIndex = None

    def get_help_for_current_index(self):
        if self.tutorialListIndex is None:
            return ''
        return self.helpDict[self.tutorialListIndex]

    def next_index(self):
        if self.tutorialListIndex is None:
            return
        self.tutorialListIndex += 1
        if self.tutorialListIndex >= len(self.helpDict):
            self.tutorialListIndex = 0

    def prev_index(self):
        if self.tutorialListIndex is None:
            return
        self.tutorialListIndex -= 1
        if self.tutorialListIndex < 0:
            self.tutorialListIndex = len(self.helpDict) - 1