import asyncio
import tempfile
import os
import logging
import glob
import json
import requests

from mutagen.easyid3 import EasyID3
from mutagen.id3 import ID3, APIC, error

logger = logging.getLogger(__name__)


async def get_video_info(url: str) -> dict:
    """Получает информацию о видео через yt-dlp"""
    try:
        process = await asyncio.create_subprocess_exec(
            'yt-dlp',
            '--dump-json',
            '--no-playlist',
            url,
            stdout=asyncio.subprocess.PIPE,
            stderr=asyncio.subprocess.PIPE
        )

        stdout, stderr = await process.communicate()
        if process.returncode == 0:
            return json.loads(stdout.decode())
    except Exception as e:
        logger.warning(f"Не удалось получить информацию о видео: {e}")
    return None


async def download_thumbnail(thumbnail_url: str) -> tuple[bytes, str]:
    """Скачивает обложку видео и возвращает данные и MIME тип"""
    try:
        response = requests.get(thumbnail_url, timeout=10)
        if response.status_code == 200:
            if 'jpeg' in thumbnail_url or 'jpg' in thumbnail_url:
                mime_type = 'image/jpeg'
            elif 'png' in thumbnail_url:
                mime_type = 'image/png'
            else:
                mime_type = response.headers.get('Content-Type', 'image/jpeg')
            return response.content, mime_type
    except Exception as e:
        logger.warning(f"Не удалось скачать обложку: {e}")
    return None, None


def apply_metadata(mp3_path: str, metadata: dict):
    """Прописывает ID3-теги и обложку в MP3"""
    try:
        try:
            audio = EasyID3(mp3_path)
        except error:
            audio = EasyID3()
            audio.save(mp3_path)

        audio['title'] = metadata.get('title', 'Unknown Title')
        audio['artist'] = metadata.get('performer', 'Unknown Artist')
        audio.save(mp3_path)

        if metadata.get('thumbnail_data'):
            audio = ID3(mp3_path)
            audio.add(
                APIC(
                    encoding=3,
                    mime=metadata.get('thumbnail_mime', 'image/jpeg'),
                    type=3,  # front cover
                    desc='Cover',
                    data=metadata['thumbnail_data']
                )
            )
            audio.save(mp3_path)
            logger.info("Обложка добавлена в MP3")
    except Exception as e:
        logger.warning(f"Не удалось прописать метаданные: {e}")


async def download_mp3_isolated(url: str) -> tuple[str, dict]:
    """Скачивает MP3, добавляет метаданные и возвращает путь к файлу и метаданные"""

    with tempfile.TemporaryDirectory() as temp_dir:
        output_template = os.path.join(temp_dir, "audio.%(ext)s")

        try:
            logger.info(f"Запускаю yt-dlp для: {url}")

            video_info = await get_video_info(url)
            title = "Unknown Title"
            uploader = "Unknown Artist"
            thumbnail_url = None
            duration = 0

            if video_info:
                title = video_info.get('title', 'Unknown Title')
                uploader = video_info.get('uploader', 'Unknown Artist')
                thumbnail_url = video_info.get('thumbnail')
                if not thumbnail_url and video_info.get('thumbnails'):
                    thumbnails = video_info.get('thumbnails', [])
                    if thumbnails:
                        thumbnail_url = thumbnails[-1].get('url')
                duration = video_info.get('duration', 0)
                logger.info(f"Получена информация о видео: {title}")

            process = await asyncio.create_subprocess_exec(
                'yt-dlp',
                '-x', '--audio-format', 'mp3',
                '--audio-quality', '320K',
                '--no-playlist',
                '-o', output_template,
                '--ignore-errors',
                url,
                stdout=asyncio.subprocess.PIPE,
                stderr=asyncio.subprocess.PIPE
            )

            stdout, stderr = await asyncio.wait_for(process.communicate(), timeout=300)

            mp3_files = glob.glob(os.path.join(temp_dir, "*.mp3"))
            if mp3_files:
                actual_file = mp3_files[0]
                if os.path.getsize(actual_file) > 1000:
                    with tempfile.NamedTemporaryFile(suffix='.mp3', delete=False) as final_file:
                        final_filename = final_file.name

                    with open(actual_file, 'rb') as src, open(final_filename, 'wb') as dst:
                        dst.write(src.read())

                    thumbnail_data, mime_type = None, None
                    if thumbnail_url:
                        thumbnail_data, mime_type = await download_thumbnail(thumbnail_url)
                        if thumbnail_data:
                            logger.info(f"Обложка скачана: {thumbnail_url}")

                    metadata = {
                        'title': title,
                        'performer': uploader,
                        'duration': duration,
                        'thumbnail_data': thumbnail_data,
                        'thumbnail_mime': mime_type
                    }

                    # Прописываем теги в MP3
                    apply_metadata(final_filename, metadata)

                    logger.info(f"Успешно скачан и обновлён тегами: {final_filename}")
                    return final_filename, metadata

            error_msg = stderr.decode() or stdout.decode() or "Файл не создан"
            raise Exception(f"Ошибка загрузки: {error_msg}")

        except asyncio.TimeoutError:
            raise Exception("Таймаут загрузки (5 минут)")
        except Exception as e:
            raise e