from pathlib import Path
import subprocess
from re import compile, findall, sub
from time import sleep
from typing import Literal
from urllib.parse import quote_plus

import uuid
import threading

from flask import Flask, render_template, request, jsonify, send_file
from httpx import Client

from yt_dlp import YoutubeDL


def extract_youtube_id(url: str) -> list[str] | str | None:
    youtube_regex = r'(https?://)?(www\.)?(youtube|youtu|youtube-nocookie)\.(com|be)/(watch\?v=|embed/|v/|.+\?v=|shorts/)?([^&=%\?]{11})'
    youtube_url_format = compile(youtube_regex)
    urls = findall(youtube_url_format, url)
    if len(urls) > 0:
        return urls[0][-1]
    else:
        return None


def download_yt_audio_ytdlp(youtube_id: str) -> Path:
    ydl_opts = {
        'format': 'bestaudio/best',
        'outtmpl': '%(title)s.%(ext)s',
    }
    with YoutubeDL(ydl_opts) as ydl:
        info_dict = ydl.extract_info(f'https://www.youtube.com/watch?v={youtube_id}', download=True)
        file_name = Path(ydl.prepare_filename(info_dict))
        print('yt_dlp ok')
        return file_name


def download_yt_audio_api(youtube_id: str) -> Path:
    encoded_youtube_url = quote_plus(f'https://www.youtube.com/watch?v={youtube_id}')
    api_response_url = f'https://ab.cococococ.com/ajax/download.php?copyright=0&format=webm&url={encoded_youtube_url}&api=dfcb6d76f2f6a9894gjkege8a4ab232222'

    with Client(verify=False, timeout=90, follow_redirects=True) as client:
        response = client.get(api_response_url)
        response.raise_for_status()
        data = response.json()
        file_name = sub(r'[^A-Za-zА-Яа-я_]', '', data['info']['title'].replace(' ', '_'))
        video_id = data.get('id')
        if not video_id:
            raise ValueError("ошибка на стороне апи!")

        progress_url = f'https://p.oceansaver.in/ajax/progress.php?id={video_id}'
        while True:
            response = client.get(progress_url)
            response.raise_for_status()
            data = response.json()
            download_url = data.get('download_url')
            if download_url:
                break
            sleep(1)

        response = client.get(download_url)
        response.raise_for_status()
        path = Path('./')
        file_name = path / f'{file_name}.webm'
        with open(file_name, 'wb') as f:
            f.write(response.content)
        print('===========================================')
        print(' API API APIAPI API API API API API API')
        print('===========================================')
        return file_name


def download_yt_audio(youtube_id: str) -> Path | None:
    try:
        return download_yt_audio_ytdlp(youtube_id)
    except Exception as e:
        print(e)
        return download_yt_audio_api(youtube_id)


def audio_to_wav(input_file: Path) -> Path | None:
    # if not input_file or not input_file.is_file():
    #     return None
    wav_file = f'{input_file.stem}.wav'
    ffmpeg_command = ["./ffmpeg", "-i", input_file, "-ac", "1", wav_file]
    subprocess.run(ffmpeg_command, check=True)
    input_file.unlink(missing_ok=True)
    return Path(wav_file)


def wav_to_opus(wav_file: Path, del_input: bool = True) -> Path:
    # if not wav_file or not wav_file.is_file():
    #     raise ValueError('входной файл для кодирования не был получен!')
    opus_file = f'{wav_file.stem}.opus'
    opusenc_command = [
        "./opusenc",
        "--bitrate", "18",
        "--vbr",
        "--speech",
        "--comp", "10",
        "--framesize", "60",
        "--downmix-mono",
        wav_file, opus_file
    ]
    subprocess.run(opusenc_command, check=True)
    if del_input:
        wav_file.unlink(missing_ok=True)
    return Path(opus_file)


def wav_to_usac(wav_file: Path, del_input: bool = True) -> Path:
    # if not wav_file or not wav_file.is_file():
    #     raise ValueError('входной файл для кодирования не был получен!')
    exhale_file = f'{wav_file.stem}.m4a'
    exhale_command = ["./exhale", "0", wav_file, exhale_file]
    subprocess.run(exhale_command, check=True)
    if del_input:
        wav_file.unlink(missing_ok=True)
    return Path(exhale_file)


def download_and_encode(youtube_url: str, codec: Literal['opus', 'usac', 'both'] = 'both') -> list[Path]:
    temp_wav = audio_to_wav(download_yt_audio(extract_youtube_id(youtube_url)))
    if codec == 'opus':
        return [wav_to_opus(temp_wav)]
    elif codec == 'usac':
        return [wav_to_usac(temp_wav)]
    else:
        return [wav_to_opus(temp_wav, del_input=False), wav_to_usac(temp_wav)]


app = Flask(__name__)


tasks = {}

@app.route('/')
def index():
    return render_template('index.html')

@app.route('/download', methods=['POST'])
def download():
    youtube_url = request.form['youtube_url']
    codec = request.form['codec']
    task_id = str(uuid.uuid4())

    def process_task():
        tasks[task_id] = {'status': 'скачивание с ютуба...'}
        audio_file = download_yt_audio(extract_youtube_id(youtube_url))
        tasks[task_id]['status'] = 'предварительная конвертация...'
        wav_file = audio_to_wav(audio_file)
        tasks[task_id]['status'] = 'сжатие...'
        encoded_files = download_and_encode(youtube_url, codec)
        tasks[task_id]['status'] = 'готово'
        tasks[task_id]['files'] = [str(f) for f in encoded_files]

    threading.Thread(target=process_task).start()
    return jsonify({'task_id': task_id})

@app.route('/download_status/<task_id>')
def download_status(task_id):
    task = tasks.get(task_id)
    if task:
        return jsonify(task)
    else:
        return jsonify({'error': 'Task not found'}), 404


@app.route('/play/<path:filename>')
def play(filename):
    return send_file(filename, as_attachment=True)


if __name__ == '__main__':
    app.run(host='0.0.0.0', port=7860)