"""Dropout.tv downloader."""

import os
import yt_dlp
import json
import requests
import re
import logging
from typing import Optional, List
import config
from download.base import my_hook, ArchiveOnlyYDL, grab

logger = logging.getLogger("syllabus")


class dropout:
    """Dropout.tv content downloader."""

    @staticmethod
    def archive(show: str, season: int) -> None:
        """Add a season to archive without downloading."""
        try:
            with open(config.DROPOUT_JSON, 'r') as json_file:
                url_mapping = json.load(json_file, object_pairs_hook=dict)
        except (IOError, json.JSONDecodeError) as e:
            logger.error(f"Failed to read dropout JSON: {e}")
            raise

        url = next((item['URL'] for item in url_mapping if item['SHOW'] == show), None)
        if url is None:
            raise ValueError(f"Show '{show}' not found in the JSON data.")

        playlist_url = f'{url}/season:{season}'

        dl_opts = {
            'quiet': True,
            'cookiefile': str(config.DROPOUT_COOKIES),
            'download_archive': str(config.DROPOUT_ARCHIVE),
            'skip_download': True,
        }

        try:
            with ArchiveOnlyYDL(dl_opts) as ydl:
                ydl.download([playlist_url])
            logger.info(f"Archived show {show}, season {season}")
        except Exception as e:
            logger.error(f"Error archiving show {show}, season {season}: {e}")
            raise

    @staticmethod
    def custom(url: str, directory: str, prefix: Optional[str] = None) -> None:
        """Download content from a custom URL with optional prefix."""
        try:
            filename_template = f"{prefix}%(title)s.%(ext)s" if prefix else "%(title)s.%(ext)s"

            dl_opts = {
                'progress_hooks': [my_hook],
                'download_archive': str(config.DROPOUT_ARCHIVE),
                'format': config.DEFAULT_FORMAT,
                'audio_quality': '256K',
                'paths': {
                    'temp': str(config.TEMP_DIR),
                    'home': directory,
                },
                'cookiefile': str(config.DROPOUT_COOKIES),
                'writesubtitles': True,
                'subtitleslangs': ['en'],
                'outtmpl': filename_template,
            }

            with yt_dlp.YoutubeDL(dl_opts) as ydl:
                ydl.download([url] if isinstance(url, str) else url)
            logger.info(f"Custom download completed for {url}")
        except Exception as e:
            logger.error(f"Error in custom download: {e}")
            raise

    @staticmethod
    def show(show: str, season: int, specials: bool = False, episode_start: Optional[int] = None) -> None:
        """Download a season of a show from dropout.tv."""
        try:
            season_str = f"{int(season):02}" if not specials else "00"
            season_type = 'Specials' if specials else f'Season {season}'
            directory = str(config.TV_DIR / show / season_type)
            os.makedirs(directory, exist_ok=True)

            with open(config.DROPOUT_JSON, 'r') as json_file:
                url_mapping = json.load(json_file, object_pairs_hook=dict)
        except (IOError, json.JSONDecodeError) as e:
            logger.error(f"Failed to read dropout JSON: {e}")
            raise

        url = next((item['URL'] for item in url_mapping if item['SHOW'] == show), None)
        if url is None:
            raise ValueError(f"Show '{show}' not found in the JSON data.")

        playlist_url = f'{url}/season:{season}'

        # Match filter logic
        filter_pattern = (
            "title "
            f"{'~=' if specials else '!~='} "
            r"'(?i).*behind.?the.?scenes.*"
            r"|.*trailer.*"
            r"|.*recap.*"
            r"|.*last.looks.*'"
        )
        match_filter = yt_dlp.utils.match_filter_func(filter_pattern)

        ydl_opts = {
            'quiet': True,
            'skip_download': True,
            'cookiefile': str(config.DROPOUT_COOKIES),
        }

        try:
            with yt_dlp.YoutubeDL(ydl_opts) as ydl:
                playlist_info = ydl.extract_info(playlist_url, download=False)
        except Exception as e:
            logger.error(f"Failed to extract playlist info: {e}")
            raise

        entries = playlist_info.get('entries', [])
        filtered_entries = [entry for entry in entries if match_filter(entry) is None]

        episode_start_num = int(episode_start) if episode_start else 1

        for i, entry in enumerate(filtered_entries, start=episode_start_num):
            episode_number = f"{i:02}"
            filename_template = f"{show} - S{season_str}E{episode_number} - %(title)s.%(ext)s"

            dl_opts = {
                'progress_hooks': [my_hook],
                'download_archive': str(config.DROPOUT_ARCHIVE),
                'format': config.DEFAULT_FORMAT,
                'audio_quality': '256K',
                'paths': {
                    'temp': str(config.TEMP_DIR),
                    'home': directory
                },
                'cookiefile': str(config.DROPOUT_COOKIES),
                'writesubtitles': True,
                'subtitleslangs': ['en'],
                'outtmpl': filename_template,
            }

            try:
                with yt_dlp.YoutubeDL(dl_opts) as ydl:
                    ydl.download([entry['webpage_url']])
            except Exception as e:
                logger.error(f"Error downloading episode {episode_number}: {e}")
                continue

    @staticmethod
    def series(force_download: bool = False) -> None:
        """Update the series list from dropout.tv."""
        from bs4 import BeautifulSoup
        
        try:
            response = requests.get(f'{config.DROPOUT_BASE_URL}/series', timeout=10)
            response.raise_for_status()
            html = response.text

            soup = BeautifulSoup(html, 'html.parser')
            elements = soup.find_all('a', class_='browse-item-link')

            shows = []
            for element in elements:
                show_data = {}
                show_data['href'] = element.get('href', '')

                img = element.find('img')
                if img:
                    show_data['src'] = img.get('src', '')
                    show_data['alt'] = img.get('alt', '')

                shows.append(show_data)

            # Load existing shows to merge
            existing_shows = {}
            try:
                with open(config.DROPOUT_JSON, 'r') as f:
                    existing_data = json.load(f, object_pairs_hook=dict)
                    for show in existing_data:
                        existing_shows[show['SHOW']] = show
            except (FileNotFoundError, json.JSONDecodeError):
                existing_data = []

            # Merge with new scraped shows
            json_data = []
            scraped_titles = set()
            
            for show in shows:
                show_title = show.get('alt', 'No title')
                scraped_titles.add(show_title)
                
                info_data = {}
                info_data['SHOW'] = show_title
                info_data['URL'] = show.get('href', 'No link')
                info_data['LINK'] = re.sub(r".*dropout.tv/", "", show.get('href', ''))
                poster_path = grab.poster(show.get('src', ''), show.get('alt', ''), force_download)
                if poster_path:
                    info_data['POSTER'] = poster_path
                
                json_data.append(info_data)

            # Add back any manually added shows that weren't scraped
            for show_title, show_data in existing_shows.items():
                if show_title not in scraped_titles:
                    json_data.append(show_data)

            os.makedirs(config.DATA_DIR, exist_ok=True)
            with open(config.DROPOUT_JSON, 'w') as json_file:
                json.dump(json_data, json_file, indent=4, separators=(',', ': '))
            logger.info(f"Updated series list with {len(json_data)} shows (merged with existing)")
        except requests.RequestException as e:
            logger.error(f"Failed to fetch series list: {e}")
            raise
        except (IOError, json.JSONDecodeError) as e:
            logger.error(f"Failed to save series JSON: {e}")
            raise
        except Exception as e:
            logger.error(f"Unexpected error updating series: {e}")
            raise