import flask; from flask import request
import itertools
import os
import subprocess
import time

from voussoirkit import flasktools
from voussoirkit import pathclass
from voussoirkit import stringtools

import ycdl

from .. import common

site = common.site

def _get_or_insert_video(video_id):
    try:
        video = common.ycdldb.get_video(video_id)
    except ycdl.exceptions.NoSuchVideo:
        with common.ycdldb.transaction:
            video = common.ycdldb.insert_video(video_id)['video']
    return video

@site.route('/all_channels.json')
def get_all_channel_names():
    all_channels = {channel.id: channel.name for channel in common.ycdldb.get_channels()}
    response = {'channels': all_channels}
    return flasktools.json_response(response)

@site.route('/channels')
def get_channels():
    channels = common.ycdldb.get_channels()
    return common.render_template(request, 'channels.html', channels=channels)

def _render_videos_listing(videos, channel, state, orderby):
    search_terms = request.args.get('q', '').lower().strip().replace('+', ' ').split()
    if search_terms:
        lowered = ((video, video.title.lower()) for video in videos)
        videos = (
            video for (video, title) in lowered
            if all(term in title for term in search_terms)
        )

    limit = request.args.get('limit', None)
    if limit is not None:
        try:
            limit = int(limit)
            videos = itertools.islice(videos, limit)
        except ValueError:
            pass

    if not isinstance(videos, list):
        videos = list(videos)

    all_states = common.ycdldb.get_all_states()

    return common.render_template(
        request,
        'channel.html',
        all_states=all_states,
        channel=channel,
        state=state,
        orderby=orderby,
        videos=videos,
    )

@site.route('/channel/<channel_id>')
@site.route('/channel/<channel_id>/<state>')
def get_channel(channel_id, state=None):
    try:
        channel = common.ycdldb.get_channel(channel_id)
    except ycdl.exceptions.NoSuchChannel:
        try:
            with common.ycdldb.transaction:
                channel = common.ycdldb.add_channel(channel_id)
        except ycdl.ytapi.ChannelNotFound:
            flask.abort(404)

    orderby = request.args.get('orderby', None)

    videos = common.ycdldb.get_videos(
        channel_id=channel.id,
        orderby=orderby,
        state=state,
    )
    return _render_videos_listing(videos, channel=channel, state=state, orderby=orderby)

@site.route('/videos')
@site.route('/videos/<state>')
def get_videos(state=None):
    orderby = request.args.get('orderby', None)

    videos = common.ycdldb.get_videos(
        orderby=orderby,
        state=state,
    )
    return _render_videos_listing(videos, channel=None, state=state, orderby=orderby)

@site.route('/watch')
def get_watch():
    video_id = request.args.get('v', '')
    if not video_id:
        return flask.redirect('/')

    try:
        video = _get_or_insert_video(video_id)
    except ycdl.ytapi.VideoNotFound:
        flask.abort(404)

    videos = [video]
    return _render_videos_listing(videos, channel=None, state=None, orderby=None)

@flasktools.required_fields(['channel_id'], forbid_whitespace=True)
@site.route('/add_channel', methods=['POST'])
def post_add_channel():
    channel_id = request.form['channel_id']
    if not (len(channel_id) == 24 and channel_id.startswith('UC')):
        # It seems they have given us a username instead.
        try:
            channel_id = common.ycdldb.youtube.get_user_id(username=channel_id)
        except ycdl.ytapi.ChannelNotFound:
            return flasktools.json_response({}, status=404)

    with common.ycdldb.transaction:
        channel = common.ycdldb.add_channel(channel_id, get_videos=True)
    return flasktools.json_response(channel.jsonify())

@site.route('/channel/<channel_id>/delete', methods=['POST'])
def post_delete_channel(channel_id):
    try:
        channel = common.ycdldb.get_channel(channel_id)
    except ycdl.exceptions.NoSuchChannel as exc:
        return flasktools.json_response(exc.jsonify(), status=404)

    with common.ycdldb.transaction:
        channel.delete()
    response = {'id': channel.id, 'deleted': channel.deleted}
    return flasktools.json_response(response)

@site.route('/channel/<channel_id>/refresh', methods=['POST'])
def post_refresh_channel(channel_id):
    force = request.form.get('force', False)
    force = stringtools.truthystring(force, False)
    try:
        channel = common.ycdldb.get_channel(channel_id)
    except ycdl.exceptions.NoSuchChannel as exc:
        return flasktools.json_response(exc.jsonify(), status=404)

    with common.ycdldb.transaction:
        channel.refresh(force=force)
    return flasktools.json_response(channel.jsonify())

@site.route('/refresh_all_channels', methods=['POST'])
def post_refresh_all_channels():
    force = request.form.get('force', False)
    force = stringtools.truthystring(force, False)
    with common.ycdldb.transaction:
        common.ycdldb.refresh_all_channels(force=force, skip_failures=True)
    common.last_refresh = time.time()
    return flasktools.json_response({})

@flasktools.required_fields(['state'], forbid_whitespace=True)
@site.route('/channel/<channel_id>/set_automark', methods=['POST'])
def post_set_automark(channel_id):
    state = request.form['state']
    channel = common.ycdldb.get_channel(channel_id)

    try:
        with common.ycdldb.transaction:
            channel.set_automark(state)
    except ycdl.exceptions.InvalidVideoState as exc:
        return flasktools.json_response(exc.jsonify(), status=400)

    response = {'id': channel.id, 'automark': channel.automark}
    return flasktools.json_response(response)

@flasktools.required_fields(['autorefresh'], forbid_whitespace=True)
@site.route('/channel/<channel_id>/set_autorefresh', methods=['POST'])
def post_set_autorefresh(channel_id):
    autorefresh = request.form['autorefresh']
    channel = common.ycdldb.get_channel(channel_id)

    try:
        autorefresh = stringtools.truthystring(autorefresh)
        with common.ycdldb.transaction:
            channel.set_autorefresh(autorefresh)
    except (ValueError, TypeError):
        flask.abort(400)

    response = {'id': channel.id, 'autorefresh': channel.autorefresh}
    return flasktools.json_response(response)

@flasktools.required_fields(['download_directory'], forbid_whitespace=False)
@site.route('/channel/<channel_id>/set_download_directory', methods=['POST'])
def post_set_download_directory(channel_id):
    download_directory = request.form['download_directory']
    channel = common.ycdldb.get_channel(channel_id)

    try:
        with common.ycdldb.transaction:
            channel.set_download_directory(download_directory)
    except pathclass.NotDirectory:
        exc = {
            'error_type': 'NOT_DIRECTORY',
            'error_message': f'"{download_directory}" is not a directory.',
        }
        return flasktools.json_response(exc, status=400)

    abspath = channel.download_directory.absolute_path if channel.download_directory else None
    response = {'id': channel.id, 'download_directory': abspath}
    return flasktools.json_response(response)

@flasktools.required_fields(['ignore_shorts'], forbid_whitespace=True)
@site.route('/channel/<channel_id>/set_ignore_shorts', methods=['POST'])
def post_set_ignore_shorts(channel_id):
    ignore_shorts = request.form['ignore_shorts']
    channel = common.ycdldb.get_channel(channel_id)

    try:
        ignore_shorts = stringtools.truthystring(ignore_shorts)
        with common.ycdldb.transaction:
            channel.set_ignore_shorts(ignore_shorts)
    except (ValueError, TypeError):
        flask.abort(400)

    response = {'id': channel.id, 'ignore_shorts': channel.ignore_shorts}
    return flasktools.json_response(response)

@flasktools.required_fields(['name'], forbid_whitespace=False)
@site.route('/channel/<channel_id>/set_name', methods=['POST'])
def post_set_name(channel_id):
    name = request.form['name']
    channel = common.ycdldb.get_channel(channel_id)

    with common.ycdldb.transaction:
        channel.set_name(name)

    response = {'id': channel.id, 'name': channel.name}
    return flasktools.json_response(response)

@flasktools.required_fields(['extension'], forbid_whitespace=False)
@site.route('/channel/<channel_id>/set_queuefile_extension', methods=['POST'])
def post_set_queuefile_extension(channel_id):
    extension = request.form['extension']
    channel = common.ycdldb.get_channel(channel_id)

    with common.ycdldb.transaction:
        channel.set_queuefile_extension(extension)

    response = {'id': channel.id, 'queuefile_extension': channel.queuefile_extension}
    return flasktools.json_response(response)

@site.route('/channel/<channel_id>/show_download_directory', methods=['POST'])
def post_show_download_directory(channel_id):
    if not request.is_localhost:
        flask.abort(403)

    channel = common.ycdldb.get_channel(channel_id)
    if channel.download_directory:
        abspath = channel.download_directory.absolute_path
    else:
        abspath = common.ycdldb.config['download_directory']

    if not os.path.exists(abspath):
        return flask.abort(400)

    if os.name == 'nt':
        command = f'explorer.exe "{abspath}"'
        subprocess.Popen(command, shell=True)
        return flasktools.json_response({})
    else:
        command = ['xdg-open', abspath]
        subprocess.Popen(command, shell=True)
        return flasktools.json_response({})

    flask.abort(501)