from youtube import util
import ast
import re
import os
import collections

import flask
from flask import request

SETTINGS_INFO = collections.OrderedDict([
    ('route_tor', {
        'type': int,
        'default': 0,
        'label': 'Route Tor',
        'comment': '''0 - Off
1 - On, except video
2 - On, including video (see warnings)''',
        'options': [
            (0, 'Off'),
            (1, 'On, except video'),
            (2, 'On, including video (see warnings)'),
        ],
        'category': 'network',
    }),

    ('tor_port', {
        'type': int,
        'default': 9150,
        'comment': '',
        'category': 'network',
    }),

    ('tor_control_port', {
        'type': int,
        'default': 9151,
        'comment': '',
        'category': 'network',
    }),

    ('port_number', {
        'type': int,
        'default': 8080,
        'comment': '',
        'category': 'network',
    }),

    ('allow_foreign_addresses', {
        'type': bool,
        'default': False,
        'comment': '''This will allow others to connect to your YouTube Local instance as a website.
For security reasons, enabling this is not recommended.''',
        'hidden': True,
        'category': 'network',
    }),

    ('allow_foreign_post_requests', {
        'type': bool,
        'default': False,
        'comment': '''Enables requests from foreign addresses to make post requests.
For security reasons, enabling this is not recommended.''',
        'hidden': True,
        'category': 'network',
    }),

    ('subtitles_mode', {
        'type': int,
        'default': 0,
        'comment': '''0 - off by default
1 - only manually created subtitles on by default
2 - enable even if automatically generated is all that's available''',
        'label': 'Default subtitles mode',
        'options': [
            (0, 'Off'),
            (1, 'Manually created only'),
            (2, 'Automatic if manual unavailable'),
        ],
        'category': 'playback',
    }),

    ('subtitles_language', {
        'type': str,
        'default': 'en',
        'comment': '''ISO 639 language code: https://en.wikipedia.org/wiki/List_of_ISO_639-1_codes''',
        'category': 'playback',
    }),

    ('related_videos_mode', {
        'type': int,
        'default': 1,
        'comment': '''0 - Related videos disabled
1 - Related videos always shown
2 - Related videos hidden; shown by clicking a button''',
        'options': [
            (0, 'Disabled'),
            (1, 'Always shown'),
            (2, 'Shown by clicking button'),
        ],
        'category': 'interface',
    }),

    ('comments_mode', {
        'type': int,
        'default': 1,
        'comment': '''0 - Video comments disabled
1 - Video comments always shown
2 - Video comments hidden; shown by clicking a button''',
        'options': [
            (0, 'Disabled'),
            (1, 'Always shown'),
            (2, 'Shown by clicking button'),
        ],
        'category': 'interface',
    }),

    ('enable_comment_avatars', {
        'type': bool,
        'default': True,
        'comment': '',
        'category': 'interface',
    }),

    ('default_comment_sorting', {
        'type': int,
        'default': 0,
        'comment': '''0 to sort by top
1 to sort by newest''',
        'options': [
            (0, 'Top'),
            (1, 'Newest'),
        ],
    }),

    ('theater_mode', {
        'type': bool,
        'default': True,
        'comment': '',
        'category': 'interface',
    }),

    ('default_resolution', {
        'type': int,
        'default': 720,
        'comment': '',
        'options': [
            (360, '360p'),
            (720, '720p'),
        ],
        'category': 'playback',
    }),

    ('use_video_player', {
        'type': int,
        'default': 1,
        'comment': '',
        'options': [
            (0, 'Native'),
            (1, 'Native with hotkeys'),
            (2, 'Plyr'),
        ],
        'category': 'interface',
    }),

    ('proxy_images', {
        'label': 'Route images',
        'type': bool,
        'default': True,
        'comment': '',
        'category': 'network',
    }),

    ('use_comments_js', {
        'label': 'Enable comments.js',
        'type': bool,
        'default': True,
        'comment': '',
        'category': 'interface',
    }),

    ('use_sponsorblock_js', {
        'label': 'Enable SponsorBlock',
        'type': bool,
        'default': False,
        'comment': '',
        'category': 'playback',
    }),

    ('theme', {
        'type': int,
        'default': 0,
        'comment': '',
        'options': [
            (0, 'Light'),
            (1, 'Gray'),
            (2, 'Dark'),
        ],
        'category': 'interface',
    }),

    ('font', {
        'type': int,
        'default': 1,
        'comment': '',
        'options': [
            (0, 'Browser default'),
            (1, 'Arial'),
            (2, 'Liberation Serif'),
            (3, 'Verdana'),
            (4, 'Tahoma'),
        ],
        'category': 'interface',
    }),

    ('embed_page_mode', {
        'type': bool,
        'label': 'Enable embed page',
        'default': True,
        'comment': '',
        'category': 'interface',
    }),

    ('autocheck_subscriptions', {
        'type': bool,
        'default': 0,
        'comment': '',
    }),

    ('gather_googlevideo_domains', {
        'type': bool,
        'default': False,
        'comment': '''Developer use to debug 403s''',
        'hidden': True,
    }),

    ('debugging_save_responses', {
        'type': bool,
        'default': False,
        'comment': '''Save all responses from youtube for debugging''',
        'hidden': True,
    }),

    ('settings_version', {
        'type': int,
        'default': 3,
        'comment': '''Do not change, remove, or comment out this value, or else your settings may be lost or corrupted''',
        'hidden': True,
    }),
])

program_directory = os.path.dirname(os.path.realpath(__file__))
acceptable_targets = SETTINGS_INFO.keys() | {'enable_comments', 'enable_related_videos'}


def comment_string(comment):
    result = ''
    for line in comment.splitlines():
        result += '# ' + line + '\n'
    return result


def save_settings(settings_dict):
    with open(settings_file_path, 'w', encoding='utf-8') as file:
        for setting_name, setting_info in SETTINGS_INFO.items():
            file.write(comment_string(setting_info['comment']) + setting_name + ' = ' + repr(settings_dict[setting_name]) + '\n\n')


def add_missing_settings(settings_dict):
    result = default_settings()
    result.update(settings_dict)
    return result


def default_settings():
    return {key: setting_info['default'] for key, setting_info in SETTINGS_INFO.items()}


def upgrade_to_2(settings_dict):
    '''Upgrade to settings version 2'''
    new_settings = settings_dict.copy()
    if 'enable_comments' in settings_dict:
        new_settings['comments_mode'] = int(settings_dict['enable_comments'])
        del new_settings['enable_comments']
    if 'enable_related_videos' in settings_dict:
        new_settings['related_videos_mode'] = int(settings_dict['enable_related_videos'])
        del new_settings['enable_related_videos']
    new_settings['settings_version'] = 2
    return new_settings


def upgrade_to_3(settings_dict):
    new_settings = settings_dict.copy()
    if 'route_tor' in settings_dict:
        new_settings['route_tor'] = int(settings_dict['route_tor'])
    new_settings['settings_version'] = 3
    return new_settings


upgrade_functions = {
    1: upgrade_to_2,
    2: upgrade_to_3,
}


def log_ignored_line(line_number, message):
    print("WARNING: Ignoring settings.txt line " + str(node.lineno) + " (" + message + ")")


if os.path.isfile("settings.txt"):
    print("Running in portable mode")
    settings_dir = os.path.normpath('./')
    data_dir = os.path.normpath('./data')
else:
    print("Running in non-portable mode")
    settings_dir = os.path.expanduser(os.path.normpath("~/.youtube-local"))
    data_dir = os.path.expanduser(os.path.normpath("~/.youtube-local/data"))
    if not os.path.exists(settings_dir):
        os.makedirs(settings_dir)

settings_file_path = os.path.join(settings_dir, 'settings.txt')

try:
    with open(settings_file_path, 'r', encoding='utf-8') as file:
        settings_text = file.read()
except FileNotFoundError:
    current_settings_dict = default_settings()
    save_settings(current_settings_dict)
else:
    if re.fullmatch(r'\s*', settings_text):     # blank file
        current_settings_dict = default_settings()
        save_settings(current_settings_dict)
    else:
        # parse settings in a safe way, without exec
        current_settings_dict = {}
        attributes = {
            ast.Constant: 'value',
            ast.NameConstant: 'value',
            ast.Num: 'n',
            ast.Str: 's',
        }
        module_node = ast.parse(settings_text)
        for node in module_node.body:
            if type(node) != ast.Assign:
                log_ignored_line(node.lineno, "only assignments are allowed")
                continue

            if len(node.targets) > 1:
                log_ignored_line(node.lineno, "only simple single-variable assignments allowed")
                continue

            target = node.targets[0]
            if type(target) != ast.Name:
                log_ignored_line(node.lineno, "only simple single-variable assignments allowed")
                continue

            if target.id not in acceptable_targets:
                log_ignored_line(node.lineno,  target.id + " is not a valid setting")
                continue

            if type(node.value) not in attributes:
                log_ignored_line(node.lineno, "only literals allowed for values")
                continue

            current_settings_dict[target.id] = node.value.__getattribute__(attributes[type(node.value)])

        # upgrades
        latest_version = SETTINGS_INFO['settings_version']['default']
        while current_settings_dict.get('settings_version', 1) < latest_version:
            current_version = current_settings_dict.get('settings_version', 1)
            print('Upgrading settings.txt to version', current_version+1)
            upgrade_func = upgrade_functions[current_version]
            # Must add missing settings here rather than below because
            # save_settings needs all settings to be present
            current_settings_dict = add_missing_settings(
                upgrade_func(current_settings_dict))
            save_settings(current_settings_dict)

        # some settings not in the file, add those missing settings to the file
        if not current_settings_dict.keys() >= SETTINGS_INFO.keys():
            print('Adding missing settings to settings.txt')
            current_settings_dict = add_missing_settings(current_settings_dict)
            save_settings(current_settings_dict)

globals().update(current_settings_dict)


if route_tor:
    print("Tor routing is ON")
else:
    print("Tor routing is OFF - your YouTube activity is NOT anonymous")


hooks = {}


def add_setting_changed_hook(setting, func):
    '''Called right before new settings take effect'''
    if setting in hooks:
        hooks[setting].append(func)
    else:
        hooks[setting] = [func]


def set_img_prefix(old_value=None, value=None):
    global img_prefix
    if value is None:
        value = proxy_images
    if value:
        img_prefix = '/'
    else:
        img_prefix = ''


set_img_prefix()

add_setting_changed_hook('proxy_images', set_img_prefix)


categories = ['network', 'interface', 'playback', 'other']


def settings_page():
    if request.method == 'GET':
        settings_by_category = {categ: [] for categ in categories}
        for setting_name, setting_info in SETTINGS_INFO.items():
            categ = setting_info.get('category', 'other')
            settings_by_category[categ].append(
                (setting_name, setting_info, current_settings_dict[setting_name])
            )
        return flask.render_template(
            'settings.html',
            categories=categories,
            settings_by_category=settings_by_category,
        )
    elif request.method == 'POST':
        for key, value in request.values.items():
            if key in SETTINGS_INFO:
                if SETTINGS_INFO[key]['type'] is bool and value == 'on':
                    current_settings_dict[key] = True
                else:
                    current_settings_dict[key] = SETTINGS_INFO[key]['type'](value)
            else:
                flask.abort(400)

        # need this bullshit because browsers don't send anything when an input is unchecked
        expected_inputs = {setting_name for setting_name, setting_info in SETTINGS_INFO.items() if not SETTINGS_INFO[setting_name].get('hidden', False)}
        missing_inputs = expected_inputs - set(request.values.keys())
        for setting_name in missing_inputs:
            assert SETTINGS_INFO[setting_name]['type'] is bool, missing_inputs
            current_settings_dict[setting_name] = False

        # call setting hooks
        for setting_name, value in current_settings_dict.items():
            old_value = globals()[setting_name]
            if value != old_value and setting_name in hooks:
                for func in hooks[setting_name]:
                    func(old_value, value)

        globals().update(current_settings_dict)
        save_settings(current_settings_dict)
        return flask.redirect(util.URL_ORIGIN + '/settings', 303)
    else:
        flask.abort(400)