import datetime
import os

import flask_restful.inputs

from db import Video, Comment, Association
from twitch import Twitch


class Sync(object):
    @staticmethod
    def _get(d, *keys, default=None):
        try:
            result = None
            for key in keys:
                if result:
                    if isinstance(result, list):
                        result = result[key]
                    else:
                        result = result.get(key, default)
                else:
                    result = d.get(key, default)
            return result
        except (KeyError, IndexError):
            return default

    @staticmethod
    def _to_datetime(val):
        if not val:
            return None
        result = flask_restful.inputs.datetime_from_iso8601(val)
        return result.astimezone(tz=datetime.timezone.utc).replace(tzinfo=None)

    @classmethod
    def perform(cls, app, db):
        app.logger.info('Starting synchronization')
        with app.app_context():
            twitch = Twitch(os.getenv('TWITCH_CLIENT_ID'))
            updated = []
            for vid in twitch.fetch_videos(os.getenv('TWITCH_CHANNEL_ID')):
                id = cls._get(vid, '_id', default='').lstrip('v')
                if not id:
                    continue
                if cls._get(vid, 'status') == 'recording':
                    continue
                q = db.session.query(Video).filter(Video.id == id)
                video = q.first()
                if not video:
                    video = Video(id=id)
                created_at = cls._get(vid, 'created_at')
                updated_at = cls._to_datetime(cls._get(vid, 'updated_at', default=created_at))
                created_at = cls._to_datetime(created_at)
                if video.updated_at and video.updated_at >= updated_at:
                    continue
                updated.append(id)
                video.broadcast_type = cls._get(vid, 'broadcast_type')
                video.title = cls._get(vid, 'title')
                video.description = cls._get(vid, 'description')
                video.game = cls._get(vid, 'game')
                video.length = cls._get(vid, 'length')
                video.thumbnail_small = cls._get(vid, 'thumbnails', 'small', 0, 'url')
                video.thumbnail_medium = cls._get(vid, 'thumbnails', 'medium', 0, 'url')
                video.thumbnail_large = cls._get(vid, 'thumbnails', 'large', 0, 'url')
                video.created_at = created_at
                video.updated_at = updated_at
                video.recorded_at = cls._to_datetime(cls._get(vid, 'recorded_at'))
                video.published_at = cls._to_datetime(cls._get(vid, 'published_at'))
                db.session.add(video)
            db.session.commit()
            app.logger.info('Updated videos: %s', ', '.join(updated) if updated else 'NONE')
            for com in twitch.fetch_comments(updated):
                q = db.session.query(Video).filter(Video.id == cls._get(com, 'content_id'))
                video = q.first()
                if not video:
                    continue
                id = cls._get(com, '_id')
                q = db.session.query(Comment).filter(Comment.id == id)
                comment = q.first()
                if not comment:
                    comment = Comment(id=id)
                comment.commenter_id = cls._get(com, 'commenter', '_id')
                comment.commenter_name = cls._get(com, 'commenter', 'name')
                comment.commenter_display_name = cls._get(com, 'commenter', 'display_name')
                comment.commenter_logo = cls._get(com, 'commenter', 'logo')
                comment.source = cls._get(com, 'source')
                comment.message_body = cls._get(com, 'message', 'body')
                comment.message_user_color = cls._get(com, 'message', 'user_color')
                badges = cls._get(com, 'message', 'user_badges')
                if badges:
                    badges = ','.join(['{_id}:{version}'.format(**b) for b in badges])
                comment.message_user_badges = badges
                comment.created_at = cls._to_datetime(cls._get(com, 'created_at'))
                comment.updated_at = cls._to_datetime(cls._get(com, 'updated_at'))
                q = db.session.query(Association).filter(
                        Association.video_id == video.id,
                        Association.comment_id == comment.id)
                assoc = q.first()
                if not assoc:
                    assoc = Association()
                assoc.comment = comment
                assoc.offset = cls._get(com, 'content_offset_seconds')
                video.associations.append(assoc)
                db.session.add(video)
            db.session.commit()
        app.logger.info('Synchronization completed')