import { parse } from "https://deno.land/std@0.139.0/flags/mod.ts";
import {
  bold,
  italic,
  underline,
} from "https://deno.land/std@0.139.0/fmt/colors.ts";
import { readableStreamFromReader } from "https://deno.land/std@0.139.0/streams/mod.ts";
import Kia from "https://deno.land/x/kia@0.4.1/mod.ts";
import srt2webvtt from "https://git.froth.zone/sam/srt-to-vtt/raw/branch/master/mod.ts";

async function main(): Promise<void> {
  // CLI stuff
  const args = parse(Deno.args, {
    alias: {
      h: "help",
      u: "upload",
    },
    boolean: ["help", "upload"],
  });
  if (args.help) {
    console.log(`
  ${bold("cytube-json-generator")}: Generate a JSON file for Cytube

    ${underline("Usage")}:

      generator ${italic("[options]")} ${underline("video")} ${
      underline(
        "subtitles",
      )
    }

        - ${underline("video")}: The path to the video file. ${
      bold(
        "THIS FILE MUST BE AN MP4!",
      )
    }
          - Example: ${italic("./video.mp4")}

        - ${underline("subtitles")}: The path to the subtitles file. ${
      bold(
        "THESE MUST BE IN SRT FORMAT!",
      )
    }
          - Example: ${italic("./subtitles.srt")}

    ${underline("Options")}:
    
      --help, -h  Show this help text
    `);
    Deno.exit(0);
  }
  if (args._.length < 2) {
    console.log(` ${bold("Error")}: video and subtitles must be specified!`);
    Deno.exit(1);
  } else if (args._.length > 2) {
    console.log(` ${bold("Error")}: too many arguments!`);
    Deno.exit(1);
  }
  // End CLI stuff

  // Get video file length
  const videoFile: string = args._[0] as string;

  //preserve file name for JSON file and strip file extension and final .
  const videoName = videoFile.split("/").pop()!.slice(
    0,
    videoFile.length - 4,
  ) as string;
  const stats = await ffprobe(videoFile).catch(() => {
    Deno.exit(1);
  });
  const videoLength = stats.duration;
  let videoHeight = stats.height as number; // Cytube wants this to be specific numbers, nmp
  //cytube freaks out if the height isn't a specific expected number so do some cleanup below
  if (videoHeight <= 480) {
    videoHeight = 480;
  }
  if (videoHeight <= 720 && videoHeight > 480) {
    videoHeight = 720;
  }
  if (videoHeight <= 1080 && videoHeight > 720) {
    videoHeight = 1080;
  }

  // Convert subtitles to webvtt
  const subtitlesFile: string = args._[1] as string;
  const subtitles = await Deno.readTextFile(subtitlesFile).catch(() => {
    console.log(` ${bold("Error")}: subtitles file not found!`);
    Deno.exit(1);
  });
  const webvtt = srt2webvtt(subtitles);
  // Write webvtt to file because idk I'm lazy and don't want to convert it to a stream
  await Deno.writeTextFile(`./${videoName}.vtt`, webvtt);

  // Upload the video
  const videoUrl = await upload(videoFile);

  // Upload the subtitles
  const subtitlesUrl = await upload(`./${videoName}.vtt`);
  const subtitleName = `${videoName}.vtt`;
  // Generate the JSON
  const json = {
    title: videoName,
    duration: videoLength,
    sources: [
      {
        url: videoUrl,
        contentType: "video/mp4",
        quality: videoHeight,
      },
    ],
    textTracks: [
      {
        url: subtitlesUrl,
        contentType: "text/vtt",
        name: subtitleName,
        default: true,
      },
    ],
  };
  // Also write it to a file because lazy
  await Deno.writeTextFile("./result.json", JSON.stringify(json));
  const result = await upload("./result.json");

  console.log(`JSON file uploaded to: ${result}`);
  Deno.exit();
}

/**
 * Runs ffprobe on the video file and returns the length in seconds
 * @param {string} videoFile The path to the video file.
 * @returns {Promise<Record<string, unknown>>} A JSON object containing the length of the video and its height.
 * @throws {Error} If ffprobe fails.
 */
async function ffprobe(videoFile: string): Promise<Record<string, unknown>> {
  const proc = Deno.run({
    cmd: [
      "ffprobe",
      "-v",
      "error",
      "-select_streams",
      "v:0",
      "-show_entries",
      "stream=duration,height",
      "-of",
      "json",
      `${videoFile}`,
    ],
    stdout: "piped",
  });
  const { code } = await proc.status();
  const rawOutput = await proc.output();
  const output = new TextDecoder().decode(rawOutput).trim();
  // Make the output into readable JSON
  let json: Record<string, unknown>;
  try {
    json = JSON.parse(output).streams[0];
  } catch (e) {
    console.log(e);
    Deno.exit(1);
  }
  // Make the duration actually a number
  json.duration = Number(json.duration);
  if (code !== 0) {
    throw new Error();
  }
  return json;
}

/**
 * Uploads the specified file to "f.ruina.exposed"
 * @param location Location of the file
 * @returns the URL of the uploaded file directly
 */
async function upload(location: string): Promise<string> {
  const kia: Kia = new Kia(`Uploading ${location}, this will take time...`);
  kia.start();
  const file = await Deno.open(location, { read: true });
  const stream = readableStreamFromReader(file);

  const res = await fetch(`https://f.ruina.exposed/upload/`, {
    method: "PUT",
    headers: {
      Accept: "application/json",
      "Linx-Expiry": "259200", // 3 days
      "Linx-Randomize": "no",
    },
    body: stream,
  }).catch(() => {
    kia.fail(`Error uploading ${location}: fetch failed`);
    Deno.exit(1);
  });
  const jsondata = await res.json().catch(() => {
    kia.fail(`Error uploading ${location}: JSON response malformed`);
    Deno.exit(1);
  });
  kia.succeed(`Successfully uploaded ${location} to ${jsondata.url}.\n`);
  return jsondata.direct_url;
}

// Run the main function
if (import.meta.main) {
  await main();
  Deno.exit(0);
}