#!/usr/bin/env node
import events from "node:events";
import fs from "node:fs/promises";
import os from "node:os";
import path from "node:path";
import process from "node:process";
import readline from "node:readline";
import util from "node:util";
import { Readability } from "@mozilla/readability";
import chalk from "chalk";
import { execa } from "execa";
import { Window } from "happy-dom";
import wrapAnsi from "wrap-ansi";

class InputError extends Error {
  override name = "InputError";
}

async function main() {
  const start = Date.now();

  const { values: args, positionals } = util.parseArgs({
    args: process.argv.slice(2),
    options: {
      wait: { type: "boolean" },
      w: { type: "boolean" },
      url: { type: "boolean" },
      u: { type: "boolean" },
      edit: { type: "boolean" },
      e: { type: "boolean" },
    },
    strict: true,
    allowPositionals: true,
  });

  const wait = args.wait ?? args.w;
  const url = args.url ?? args.u;
  const edit = args.edit ?? args.e;

  let input = positionals.join(" ").trim();

  if (!input) {
    process.stdin.setEncoding("utf8");
    process.stdin.on("data", (data) => {
      input += data;
    });
    await events.once(process.stdin, "end");
  }

  if (!input) {
    throw new InputError(
      "No input was given. Use positional arguments or stdin.",
    );
  }

  if (url) {
    const result = await fetch(input);
    const window = new Window({ url: input });
    const doc = window.document;
    doc.write(await result.text());
    await window.happyDOM.waitUntilComplete();
    const readable = new Readability(doc).parse();
    if (!readable?.textContent) {
      throw new InputError(
        "Unable to read webpage. This usually means it's blocking scrapers.",
      );
    }
    input = readable.textContent.trim();
  }

  const home = os.homedir();
  const cwd = path.join(home, ".ttsc");

  if (edit) {
    const file = path.join(cwd, "input.txt");
    await fs.writeFile(file, input, "utf8");
    const editor = process.env.EDITOR || "nano";
    await execa({
      cwd,
      stdin: "inherit",
      stdout: "inherit",
      stderr: "inherit",
    })`${editor} ${file}`;
    input = await fs.readFile(file, "utf8");
  }

  console.log(chalk.blue("Welcome to TTSC!"));
  console.log(
    chalk.yellow(
      "Beginning TTS processing... (This will take extra time the first time)",
    ),
  );

  const wavs = fs.glob(path.join(cwd, "*.wav"));
  for await (const wav of wavs) await fs.rm(wav);

  const koko = execa({
    cwd,
    input,
    stdout: "pipe",
    stderr: "inherit",
  })`uv run -- python -u main.py`;

  if (!wait) {
    koko.catch(() => {});
    koko.then(() => {
      const stop = Date.now();
      const duration = ((stop - start) / 1000).toFixed(2);
      console.log(chalk.green(`\nProcessing finished: ${duration}s`));
    });
  }

  let first = true;
  const files = [];
  const rl = readline.createInterface({ input: koko.stdout });

  for await (const line of rl) {
    const trimmed = line.trim();
    if (!trimmed) continue;

    let info: { file: number; text: string };
    try {
      info = JSON.parse(trimmed);
    } catch {
      console.log(trimmed);
      continue;
    }

    if (first) {
      first = false;
      const stop = Date.now();
      const duration = ((stop - start) / 1000).toFixed(2);
      console.log(chalk.green(`\nTime-to-audio: ${duration}s`));
    }

    const file = path.join(cwd, `${info.file}.wav`);

    if (wait) {
      files.push(file);
      process.stdout.write(".");
    } else {
      const [columns] = process.stdout.getWindowSize();
      const text = wrapAnsi(info.text, columns);
      console.log(`\n${chalk.blue(file)}\n${text}\n`);
      await execa({
        cwd,
        stdin: "ignore",
        stdout: "inherit",
        stderr: "inherit",
      })`mpv ${file}`;
    }
  }

  await koko;
  if (!wait) return;

  const stop = Date.now();
  const duration = ((stop - start) / 1000).toFixed(2);
  console.log(chalk.green(`\nProcessing finished: ${duration}s`));

  console.log(chalk.yellow(`Combining audio with sox...\n`));
  try {
    await execa({ cwd, shell: true })`sox ${files} output.wav`;
  } catch (err) {
    if (err instanceof Object && "code" in err && err.code === "ENOENT") {
      console.error("Sox not found. Unable to combine outputs.");
      console.log(chalk.yellow(`Audio available in ${cwd}`));
      return;
    } else {
      throw err;
    }
  }

  const [columns] = process.stdout.getWindowSize();
  console.log(wrapAnsi(input, columns));

  console.log(
    chalk.green(`Playing audio from ${path.join(cwd, "output.wav")}`),
  );
  await execa({
    cwd,
    stdin: "ignore",
    stdout: "inherit",
    stderr: "inherit",
  })`mpv --pause output.wav`;
}

main().catch((err) => {
  console.error(err);
  process.exit(1);
});