#!/usr/bin/env python3
import configparser
import os
import shutil
import subprocess
import sys
import time
from datetime import datetime
from pathlib import Path
from typing import List

import requests

channel_list: List[str] = []
downloading = {}

# Default Config Settings
streamlink_location: str = "streamlink"
download_location: str = f"{Path.home()}/Downloads/Streams"
skip_ads: bool = False


def load_config() -> None:
    print("Reading config file...")
    config = configparser.ConfigParser()
    config.read("config.ini")
    if (
        config.has_option("settings", "streamlink_location")
        and not config["settings"]["streamlink_location"].strip()
    ):
        streamlink_location = config["settings"]["streamlink_location"]
        print(f"Streamlink location: {streamlink_location}")
    if (
        config.has_option("settings", "download_location")
        and not config["settings"]["download_location"].strip()
    ):
        download_location = config["settings"]["download_location"]
        print(f"Download location: {download_location}")
    if config.has_option("settings", "skip_ads") and not config["settings"]["skip_ads"]:
        skip_ads = bool(config["settings"]["skip_ads"])
        print(f"Skip ads: {skip_ads}")

    print("Config file loaded")


def write_log(channel: str) -> None:
    """Writes the latest stdout of a process to log.txt"""
    with open("log.txt", "a") as log:
        line = downloading[channel].stdout.readline()
        if line:
            log.write(line.decode())


def download_stream(channel: str) -> None:
    """Downloads a given channel name in its own subprocess"""
    # TODO: Just clean this up at somepoint
    addtional_parms: str = ""
    if skip_ads:
        addtional_parms = "--twitch-proxy-playlist=https://lb-eu.cdn-perfprod.com,https://lb-eu2.cdn-perfprod.com,https://lb-na.cdn-perfprod.com,https://lb-as.cdn-perfprod.com,https://as.luminous.dev --twitch-disable-ads"
    file_name: str = f"{channel}_{datetime.now().strftime('%Y-%m-%d_%H-%M-%S')}.ts"
    cmd: str = (
        f"{streamlink_location} --loglevel none --retry-max 10 {addtional_parms} -o {download_location}/{channel}/{file_name} twitch.tv/{channel} best"
    )
    downloading[channel] = subprocess.Popen(
        [cmd],
        shell=True,
        start_new_session=True,
        stdout=subprocess.PIPE,
        stderr=subprocess.STDOUT,
    )
    write_log(channel)


def check_system() -> None:
    """Makes sure everything is place for the script to run"""

    # Checks for config file
    if not os.path.exists("config.ini"):
        sys.exit("ERROR: config.ini is not found! See README.md for more info.")

    # Checks if streamlink is in the systems path
    if not shutil.which("streamlink"):
        sys.exit("ERROR: streamlink is not found in the systems path!")

    # TODO: Combine the channel_list into the config
    # Checks if the channel_list exists and if not makes one
    if not os.path.exists("channel_list.txt"):
        print("ERROR:'channel_list.txt' does not exist, creating now!")
        with open("channel_list.txt", "w"):
            pass  # Creates empty file
        sys.exit("Please populate the channel_list.txt with one channel per line!")

    # Make sure the download location exists
    if not os.path.exists(download_location):
        print(
            f"Download destination does not exist.\n Creating now at {download_location}"
        )
        os.makedirs(download_location)


def stop_downloads() -> None:
    """Goes through every process and stops it if running"""
    print("\nCleaning up...")
    for name, proc in downloading.items():
        proc.terminate()
        print(f"Stopping download of {name}")


def main() -> None:
    """Main entry point of the app"""
    # Grab all the channels from channel_list.txt and put them in a list
    with open("channel_list.txt", "r") as file:
        # channel_list = file.readlines()
        channel_list = [
            line for line in file if line.strip()
        ]  # Removes all white spaces per line

    # Run untill progam is killed
    while True:
        # Exits the program if there is no channels to grab
        if not channel_list:
            sys.exit("Please populate the channel_list.txt with one channel per line!")
        print("\n------------------------------------")
        for channel in channel_list:
            channel = channel.strip()
            # TODO: Have steamlink itself check if the channel is live
            contents = requests.get("https://www.twitch.tv/" + channel).content.decode(
                "utf-8"
            )
            if "isLiveBroadcast" in contents:
                print(f"\033[1m{channel}\033[0m is \033[32mlive\033[0m!")
                if channel not in downloading:
                    download_stream(channel)
                else:
                    print(f"{channel} is already downloading")
                    write_log(channel)
            else:
                print("\033[1m" + channel + "\033[0m is \033[31mnot live\033[0m.")
                if channel in downloading:
                    del downloading[channel]
                    print(f"{channel} is no longer downloading")
            time.sleep(1)  # Wait one second before going to next channel
        print(
            "\n\033[3mLast checked: " + datetime.now().strftime("%H:%M:%S") + "\033[0m"
        )
        print("------------------------------------")
        time.sleep(60)  # Wait 60 Seconds before trying again


if __name__ == "__main__":
    """This is executed when run from the command line"""
    try:
        check_system()
        load_config()
        main()
    finally:
        stop_downloads()