import titleCase from "https://deno.land/x/case@2.1.1/titleCase.ts";

const [dir, postDir] = Deno.args;

const contents = [];

for await (const file of Deno.readDir(dir)) {
  if (file.name[0] === ".") continue;
  contents.push(file);
}

const filenames = contents
  .map((dir) => dir.name)
  .sort()
  .reverse();

const entriesAsync = filenames.map(formatEntry);
const entries = await Promise.all(entriesAsync);

const plsText = `[playlist]
${entries.join("\n")}
NumberOfEntries=${entries.length}
Version=2
`;

console.log(plsText);

async function formatEntry(fileName, index) {
  const num = index + 1;
  const [nameOrDate, memoName] = fileName.split("_");
  const title = memoName
    ? titleCase(memoName.split(".")[0]) + ` (${nameOrDate})`
    : titleCase(nameOrDate.split(".")[0]);

  return "" +
    `File${num}=https://static.bpev.me/blog/${postDir}/version/${fileName}\n` +
    `Title${num}=${title}\n` +
    `Length${num}=${await getDurationSeconds(fileName)}\n`;
}

async function getDurationSeconds(fileName) {
  const p = Deno.run({
    cmd: [ "/Users/ben/apps/ffmpeg", "-i", fileName ],
    stderr: "piped",
  });
  await p.status();
  const output = new TextDecoder().decode(await p.stderrOutput());
  const time = output.match(/Duration: ([^.]*)/)[1];
  const [hours, minutes, seconds] = time.split(":");
  return (parseInt(hours) * 3600) + (parseInt(minutes) * 60) + parseInt(seconds);
}