#!/usr/local/bin/python3
# coding: utf-8

# ytdlbot - downloader.py
# 8/14/21 16:53
#

__author__ = "Benny <benny.think@gmail.com>"

import logging
import os
import pathlib
import random
import re
import subprocess
import time
import traceback
from io import StringIO
from unittest.mock import MagicMock

import fakeredis
import ffmpeg
import ffpb
import filetype
import requests
import yt_dlp as ytdl
from pyrogram import types
from tqdm import tqdm

from config import AUDIO_FORMAT, ENABLE_ARIA2, ENABLE_FFMPEG, TG_MAX_SIZE, IPv6
from limit import Payment
from utils import adjust_formats, apply_log_formatter, current_time, sizeof_fmt

r = fakeredis.FakeStrictRedis()
apply_log_formatter()


def edit_text(bot_msg: types.Message, text: str):
    key = f"{bot_msg.chat.id}-{bot_msg.id}"
    # if the key exists, we shouldn't send edit message
    if not r.exists(key):
        time.sleep(random.random())
        r.set(key, "ok", ex=3)
        bot_msg.edit_text(text)


def tqdm_progress(desc, total, finished, speed="", eta=""):
    def more(title, initial):
        if initial:
            return f"{title} {initial}"
        else:
            return ""

    f = StringIO()
    tqdm(
        total=total,
        initial=finished,
        file=f,
        ascii=False,
        unit_scale=True,
        ncols=30,
        bar_format="{l_bar}{bar} |{n_fmt}/{total_fmt} ",
    )
    raw_output = f.getvalue()
    tqdm_output = raw_output.split("|")
    progress = f"`[{tqdm_output[1]}]`"
    detail = tqdm_output[2].replace("[A", "")
    text = f"""
{desc}

{progress}
{detail}
{more("Speed:", speed)}
{more("ETA:", eta)}
    """
    f.close()
    return text


def remove_bash_color(text):
    return re.sub(r"\u001b|\[0;94m|\u001b\[0m|\[0;32m|\[0m|\[0;33m", "", text)


def download_hook(d: dict, bot_msg):
    # since we're using celery, server location may be located in different region.
    # Therefore, we can't trigger the hook very often.
    # the key is user_id + download_link
    original_url = d["info_dict"]["original_url"]
    key = f"{bot_msg.chat.id}-{original_url}"

    if d["status"] == "downloading":
        downloaded = d.get("downloaded_bytes", 0)
        total = d.get("total_bytes") or d.get("total_bytes_estimate", 0)
        if total > TG_MAX_SIZE:
            raise Exception(f"Your download file size {sizeof_fmt(total)} is too large for Telegram.")

        # percent = remove_bash_color(d.get("_percent_str", "N/A"))
        speed = remove_bash_color(d.get("_speed_str", "N/A"))
        eta = remove_bash_color(d.get("_eta_str", d.get("eta")))
        text = tqdm_progress("Downloading...", total, downloaded, speed, eta)
        edit_text(bot_msg, text)
        r.set(key, "ok", ex=5)


def upload_hook(current, total, bot_msg):
    text = tqdm_progress("Uploading...", total, current)
    edit_text(bot_msg, text)


def convert_to_mp4(video_paths: list, bot_msg):
    default_type = ["video/x-flv", "video/webm"]
    # all_converted = []
    for path in video_paths:
        # if we can't guess file type, we assume it's video/mp4
        mime = getattr(filetype.guess(path), "mime", "video/mp4")
        if mime in default_type:
            if not can_convert_mp4(path, bot_msg.chat.id):
                logging.warning("Conversion abort for %s", bot_msg.chat.id)
                bot_msg._client.send_message(bot_msg.chat.id, "Can't convert your video. ffmpeg has been disabled.")
                break
            edit_text(bot_msg, f"{current_time()}: Converting {path.name} to mp4. Please wait.")
            new_file_path = path.with_suffix(".mp4")
            logging.info("Detected %s, converting to mp4...", mime)
            run_ffmpeg_progressbar(["ffmpeg", "-y", "-i", path, new_file_path], bot_msg)
            index = video_paths.index(path)
            video_paths[index] = new_file_path


class ProgressBar(tqdm):
    b = None

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.bot_msg = self.b

    def update(self, n=1):
        super().update(n)
        t = tqdm_progress("Converting...", self.total, self.n)
        edit_text(self.bot_msg, t)


def run_ffmpeg_progressbar(cmd_list: list, bm):
    cmd_list = cmd_list.copy()[1:]
    ProgressBar.b = bm
    ffpb.main(cmd_list, tqdm=ProgressBar)


def can_convert_mp4(video_path, uid):
    if not ENABLE_FFMPEG:
        return False
    return True


def ytdl_download(url: str, tempdir: str, bm, **kwargs) -> list:
    payment = Payment()
    chat_id = bm.chat.id
    hijack = kwargs.get("hijack")
    output = pathlib.Path(tempdir, "%(title).70s.%(ext)s").as_posix()
    ydl_opts = {
        "progress_hooks": [lambda d: download_hook(d, bm)],
        "outtmpl": output,
        "restrictfilenames": False,
        "quiet": True,
    }
    if ENABLE_ARIA2:
        ydl_opts["external_downloader"] = "aria2c"
        ydl_opts["external_downloader_args"] = [
            "--min-split-size=1M",
            "--max-connection-per-server=16",
            "--max-concurrent-downloads=16",
            "--split=16",
        ]
    if url.startswith("https://drive.google.com"):
        # Always use the `source` format for Google Drive URLs.
        formats = ["source"]
    else:
        # Use the default formats for other URLs.
        formats = [
            # webm , vp9 and av01 are not streamable on telegram, so we'll extract only mp4
            "bestvideo[ext=mp4][vcodec!*=av01][vcodec!*=vp09]+bestaudio[ext=m4a]/bestvideo+bestaudio",
            "bestvideo[vcodec^=avc]+bestaudio[acodec^=mp4a]/best[vcodec^=avc]/best",
            None,
        ]
    adjust_formats(chat_id, url, formats, hijack)
    if download_instagram(url, tempdir):
        return list(pathlib.Path(tempdir).glob("*"))

    address = ["::", "0.0.0.0"] if IPv6 else [None]
    error = None
    video_paths = None
    for format_ in formats:
        ydl_opts["format"] = format_
        for addr in address:
            # IPv6 goes first in each format
            ydl_opts["source_address"] = addr
            try:
                logging.info("Downloading for %s with format %s", url, format_)
                with ytdl.YoutubeDL(ydl_opts) as ydl:
                    ydl.download([url])
                video_paths = list(pathlib.Path(tempdir).glob("*"))
                break
            except Exception:
                error = traceback.format_exc()
                logging.error("Download failed for %s - %s, try another way", format_, url)
        if error is None:
            break

    if not video_paths:
        raise Exception(error)

    # convert format if necessary
    settings = payment.get_user_settings(chat_id)
    if settings[2] == "video" or isinstance(settings[2], MagicMock):
        # only convert if send type is video
        convert_to_mp4(video_paths, bm)
    if settings[2] == "audio" or hijack == "bestaudio[ext=m4a]":
        convert_audio_format(video_paths, bm)
    # split_large_video(video_paths)
    return video_paths


def convert_audio_format(video_paths: list, bm):
    # 1. file is audio, default format
    # 2. file is video, default format
    # 3. non default format

    for path in video_paths:
        streams = ffmpeg.probe(path)["streams"]
        if AUDIO_FORMAT is None and len(streams) == 1 and streams[0]["codec_type"] == "audio":
            logging.info("%s is audio, default format, no need to convert", path)
        elif AUDIO_FORMAT is None and len(streams) >= 2:
            logging.info("%s is video, default format, need to extract audio", path)
            audio_stream = {"codec_name": "m4a"}
            for stream in streams:
                if stream["codec_type"] == "audio":
                    audio_stream = stream
                    break
            ext = audio_stream["codec_name"]
            new_path = path.with_suffix(f".{ext}")
            run_ffmpeg_progressbar(["ffmpeg", "-y", "-i", path, "-vn", "-acodec", "copy", new_path], bm)
            path.unlink()
            index = video_paths.index(path)
            video_paths[index] = new_path
        else:
            logging.info("Not default format, converting %s to %s", path, AUDIO_FORMAT)
            new_path = path.with_suffix(f".{AUDIO_FORMAT}")
            run_ffmpeg_progressbar(["ffmpeg", "-y", "-i", path, new_path], bm)
            path.unlink()
            index = video_paths.index(path)
            video_paths[index] = new_path


def split_large_video(video_paths: list):
    original_video = None
    split = False
    for original_video in video_paths:
        size = os.stat(original_video).st_size
        if size > TG_MAX_SIZE:
            split = True
            logging.warning("file is too large %s, splitting...", size)
            subprocess.check_output(f"sh split-video.sh {original_video} {TG_MAX_SIZE * 0.95} ".split())
            os.remove(original_video)

    if split and original_video:
        return [i for i in pathlib.Path(original_video).parent.glob("*")]


def download_instagram(url: str, tempdir: str):
    if not url.startswith("https://www.instagram.com"):
        return False

    resp = requests.get(f"http://192.168.6.1:15000/?url={url}").json()
    if url_results := resp.get("data"):
        for link in url_results:
            content = requests.get(link, stream=True).content
            ext = filetype.guess_extension(content)
            save_path = pathlib.Path(tempdir, f"{id(link)}.{ext}")
            with open(save_path, "wb") as f:
                f.write(content)

        return True