import asyncio
import pathlib
from http import HTTPStatus

from sanic import response, Blueprint
from sanic.request import Request
from sanic_ext import validate
from sanic_ext.extensions.openapi import openapi

from wrolpi.api_utils import json_response
from wrolpi.common import logger, wrol_mode_check, get_media_directory, get_relative_to_media_directory
from wrolpi.events import Events
from wrolpi.schema import JSONErrorResponse
from wrolpi.vars import PYTEST
from . import lib
from .. import schema
from ..errors import UnknownChannel
from ..lib import save_channels_config
from ..models import Channel

channel_bp = Blueprint('Channel', url_prefix='/api/videos/channels')

logger = logger.getChild(__name__)


@channel_bp.get('/')
@openapi.description('Get a list of all Channels')
@openapi.response(HTTPStatus.OK, schema.ChannelsResponse)
async def get_channels(request: Request):
    channels = await lib.get_minimal_channels(request.ctx.session)
    return json_response({'channels': channels})


@channel_bp.get('/<channel_id:int>')
@openapi.description('Get a Channel')
@openapi.response(HTTPStatus.OK, schema.ChannelResponse)
def channel_get(request: Request, channel_id: int = None):
    session = request.ctx.session
    channel = lib.get_channel(session, channel_id=channel_id, return_dict=True)
    channel.pop('info_json')
    return json_response({'channel': channel})


@channel_bp.post('/')
@openapi.definition(
    description='Insert a Channel',
    body=schema.ChannelPostRequest,
)
@openapi.response(HTTPStatus.OK, schema.ChannelPostResponse)
@openapi.response(HTTPStatus.BAD_REQUEST, JSONErrorResponse)
@validate(schema.ChannelPostRequest)
@wrol_mode_check
def channel_post(request: Request, body: schema.ChannelPostRequest):
    body.directory = get_media_directory() / body.directory

    # A write block: creating a Channel reads (the URL/name/directory conflict check) before it
    # INSERTs, and a deferred transaction fails that lock upgrade *instantly* with "database is
    # locked" if anything else wrote in between -- which is what a user creating a Channel while
    # background workers saved configs hit.  The block also commits before the refresh below is
    # fired, so the refresh does not wait on a lock this request still holds.
    with request.ctx.db.write() as session:
        channel = lib.create_channel(session, data=body, return_dict=False)
        channel_id, channel_name = channel.id, channel.name

    # Refresh the videos asynchronously
    Channel.refresh_files(channel_id)

    Events.send_created(f'Created Channel: {channel_name}')

    return response.json({'success': 'Channel created successfully'}, HTTPStatus.CREATED,
                         {'Location': f'/api/videos/channels/{channel_id}'})


@channel_bp.put('/<channel_id:int>')
@openapi.definition(
    description='Update a Channel',
    body=schema.ChannelPutRequest,
)
@openapi.response(HTTPStatus.NO_CONTENT)
@openapi.response(HTTPStatus.BAD_REQUEST, JSONErrorResponse)
@validate(schema.ChannelPutRequest)
@wrol_mode_check
async def channel_update(request: Request, channel_id: int, body: schema.ChannelPutRequest):
    session = request.ctx.session
    body.directory = pathlib.Path(body.directory) if body.directory else None
    channel = await lib.update_channel(session, data=body, channel_id=channel_id)
    save_channels_config.activate_switch()
    return response.raw('', HTTPStatus.NO_CONTENT,
                        headers={'Location': f'/api/videos/channels/{channel.id}'})


@channel_bp.delete('/<channel_id:int>')
@openapi.description('Delete a Channel')
@openapi.response(HTTPStatus.NOT_FOUND, JSONErrorResponse)
@wrol_mode_check
def channel_delete(request: Request, channel_id: int):
    session = request.ctx.session
    channel = lib.delete_channel(session, channel_id=channel_id)
    Events.send_deleted(f'Deleted Channel: {channel["name"]}')
    return response.raw('', HTTPStatus.NO_CONTENT)


@channel_bp.post('/refresh/<channel_id:int>')
@openapi.description('Refresh all files in the Channel directory')
@openapi.response(HTTPStatus.NOT_FOUND, JSONErrorResponse)
@wrol_mode_check
def channel_refresh(request: Request, channel_id: int):
    session = request.ctx.session
    channel: Channel = lib.get_channel(session, channel_id=channel_id, return_dict=False)
    if not channel:
        raise UnknownChannel()

    channel.refresh_files(channel.id)
    directory = get_relative_to_media_directory(channel.directory)
    Events.send_directory_refresh(f'Refreshing: {directory}')
    return response.empty()


@channel_bp.post('/<channel_id:int>/tag')
@openapi.definition(
    description='Tag/untag a Channel with a single tag',
    body=schema.ChannelTagRequest,
)
@openapi.response(HTTPStatus.NO_CONTENT)
@openapi.response(HTTPStatus.BAD_REQUEST, JSONErrorResponse)
@validate(schema.ChannelTagRequest)
@wrol_mode_check
async def channel_tag(request: Request, channel_id: int, body: schema.ChannelTagRequest):
    session = request.ctx.session
    directory = None
    if body.directory:
        directory = pathlib.Path(body.directory)
        directory = get_media_directory() / directory

    await lib.tag_channel(session, body.tag_name, directory, channel_id)

    return response.raw('', HTTPStatus.NO_CONTENT)


@channel_bp.post('/search')
@openapi.definition(
    description='Search Channels',
    body=schema.ChannelSearchRequest,
)
@validate(schema.ChannelSearchRequest)
async def channel_search(request: Request, body: schema.ChannelSearchRequest):
    session = request.ctx.session
    channels = await lib.search_channels(session, body.tag_names)
    ret = dict(
        channels=channels,
    )
    return json_response(ret)