#!/usr/bin/env node
'use strict';

/**
 * Mock ProPresenter looks API, for developing the ProPresenter Look module
 * without the real thing.
 *
 *   node tools/pp-looks-mock.js [port]        (default 1601)
 *     --every <seconds>   how often the live look changes (default 8)
 *     --password <pw>     demand ?password=<pw> like a locked ProPresenter
 *     --no-list           answer 404 for /v1/looks (an older ProPresenter)
 *
 * Point the module at host 127.0.0.1 and this port. Every few changes the
 * live look is "modified by hand", so it matches no saved look.
 */

const http = require('http');
const crypto = require('crypto');

const args = process.argv.slice(2);
const flag = (name) => {
  const i = args.indexOf(name);
  return i >= 0 ? args[i + 1] : undefined;
};
const port = Number(args.find((a) => /^\d+$/.test(a))) || 1601;
const every = Number(flag('--every')) || 8;
const password = flag('--password') || '';
const noList = args.includes('--no-list');

const screen = (on) => ({ video_input: false, media: on, slide: on, announcements: on, props: on, messages: on, presentation: null, mask: null });
const saved = ['Normal', 'Lyrics Only', 'Sermon', 'Countdown', 'Video Only'].map((name, index) => ({
  id: { uuid: crypto.randomUUID(), name, index },
  screens: [screen(true), screen(index !== 4)],
}));

let live = 0;
let modified = false;
let changes = 0;
const liveUuid = crypto.randomUUID();

setInterval(() => {
  changes += 1;
  modified = changes % 4 === 0;
  if (!modified) live = (live + 1) % saved.length;
  console.log(`live look → ${saved[live].id.name}${modified ? ' (modified)' : ''}`);
}, every * 1000);

function currentLook() {
  return {
    id: { uuid: liveUuid, name: saved[live].id.name, index: modified ? saved.length : live },
    screens: saved[live].screens,
  };
}

http.createServer((req, res) => {
  const url = new URL(req.url, 'http://x');
  const send = (code, body) => {
    res.writeHead(code, { 'Content-Type': 'application/json' });
    res.end(body === undefined ? '' : JSON.stringify(body));
  };
  if (password && url.searchParams.get('password') !== password) return send(401, { error: 'password' });
  if (url.pathname === '/version') return send(200, { name: 'Mock', platform: 'mac', os_version: '15', host_description: 'ProPresenter 21.0 (mock)' });
  if (url.pathname === '/v1/looks') return noList ? send(404) : send(200, saved);
  if (url.pathname === '/v1/look/current') return send(200, currentLook());
  send(404);
}).listen(port, () => {
  console.log(`mock ProPresenter looks on http://127.0.0.1:${port} — live look changes every ${every}s`);
  console.log(`live look → ${saved[live].id.name}`);
});