// Builds the webOS app into dist/: the bundled script, the page, the icons
// and config.js with the arr-tui config baked in.
//
//   node build.mjs                 config from $ARR_TUI_CONFIG or ~/.config/arr-tui/config.json
//   node build.mjs --config FILE   another config file
//   node build.mjs --demo          the fake services of dev/screenshots (server.py)
//   node build.mjs --dev           not minified
//
// The baked-in config holds API keys: never publish a package built with it.

import * as esbuild from "esbuild";
import { copyFileSync, existsSync, mkdirSync, readdirSync, readFileSync, rmSync, writeFileSync } from "node:fs";
import { homedir } from "node:os";
import { dirname, join } from "node:path";
import { fileURLToPath } from "node:url";
import { deflateSync } from "node:zlib";

const here = dirname(fileURLToPath(import.meta.url));
const dist = join(here, "dist");
const args = process.argv.slice(2);
const flag = (name) => args.includes(name);
const option = (name) => {
  const i = args.indexOf(name);
  return i >= 0 ? args[i + 1] : undefined;
};

// The oldest browser engine targeted: webOS 5 (2020 TVs) has Chromium 68.
const target = "chrome68";

function configPath() {
  if (option("--config")) return option("--config");
  if (process.env.ARR_TUI_CONFIG) return process.env.ARR_TUI_CONFIG;
  const base = process.env.XDG_CONFIG_HOME || join(homedir(), ".config");
  return join(base, "arr-tui", "config.json");
}

function demoConfig() {
  const key = "0123456789abcdef0123456789abcdef";
  return {
    radarr: { url: "http://127.0.0.1:19891", apikey: key, default_quality_profile: "Ultra-HD", default_root_folder: "/movies" },
    sonarr: { url: "http://127.0.0.1:19892", apikey: key, default_quality_profile: "HD-1080p", default_root_folder: "/tv" },
    sabnzbd: { url: "http://127.0.0.1:19893", apikey: key },
    trakt: { client_id: key },
    ui: { theme: "dark" },
  };
}

// pick keeps the settings the TV app uses, nothing else from the file.
function pick(c) {
  const svc = (s = {}) => ({ url: s.url ?? "", apikey: s.apikey ?? "" });
  const arr = (s = {}) => ({ ...svc(s), default_quality_profile: s.default_quality_profile, default_root_folder: s.default_root_folder });
  const ui = c.ui ?? {};
  return {
    radarr: arr(c.radarr),
    sonarr: arr(c.sonarr),
    sabnzbd: svc(c.sabnzbd),
    trakt: { client_id: c.trakt?.client_id },
    ui: { theme: ui.theme, refresh_seconds: ui.refresh_seconds, covers: ui.covers, notify_downloads: ui.notify_downloads },
  };
}

function loadConfig() {
  if (flag("--demo")) return { config: demoConfig(), from: "the demo services", extra: 'window.ARR_TUI_TRAKT_URL = "http://127.0.0.1:19894";\n' };
  const path = configPath();
  if (!existsSync(path)) {
    console.warn(`no config at ${path}: the app starts with Settings`);
    return { config: pick({}), from: "nothing", extra: "" };
  }
  return { config: pick(JSON.parse(readFileSync(path, "utf8"))), from: path, extra: "" };
}

// --- Icons: drawn here, so no image tools are needed ---

function png(size, draw) {
  const px = Buffer.alloc(size * size * 4);
  for (let y = 0; y < size; y++) for (let x = 0; x < size; x++) px.set(draw(x + 0.5, y + 0.5, size), (y * size + x) * 4);
  const raw = Buffer.alloc((size * 4 + 1) * size);
  for (let y = 0; y < size; y++) px.copy(raw, y * (size * 4 + 1) + 1, y * size * 4, (y + 1) * size * 4);
  const chunk = (type, data) => {
    const len = Buffer.alloc(4);
    len.writeUInt32BE(data.length);
    const td = Buffer.concat([Buffer.from(type), data]);
    const crc = Buffer.alloc(4);
    crc.writeUInt32BE(crc32(td) >>> 0);
    return Buffer.concat([len, td, crc]);
  };
  const ihdr = Buffer.alloc(13);
  ihdr.writeUInt32BE(size, 0);
  ihdr.writeUInt32BE(size, 4);
  ihdr[8] = 8; // bit depth
  ihdr[9] = 6; // RGBA
  return Buffer.concat([Buffer.from([137, 80, 78, 71, 13, 10, 26, 10]), chunk("IHDR", ihdr), chunk("IDAT", deflateSync(raw)), chunk("IEND", Buffer.alloc(0))]);
}

function crc32(buf) {
  let c = ~0;
  for (const b of buf) {
    c ^= b;
    for (let k = 0; k < 8; k++) c = c & 1 ? (c >>> 1) ^ 0xedb88320 : c >>> 1;
  }
  return ~c;
}

// The icon: a dark rounded square with three yellow list bars of different
// lengths and a blue dot (a title downloading), as in the Library.
function icon(x, y, s) {
  const u = (v) => v * s;
  const r = u(0.18);
  const inside = (() => {
    const cx = Math.min(Math.max(x, r), s - r);
    const cy = Math.min(Math.max(y, r), s - r);
    return (x - cx) ** 2 + (y - cy) ** 2 <= r * r;
  })();
  if (!inside) return [0, 0, 0, 0];
  const bars = [[0.26, 0.42, 0.74], [0.45, 0.42, 0.62], [0.64, 0.42, 0.70]];
  for (const [top, left, right] of bars) {
    if (y >= u(top) && y <= u(top + 0.1) && x >= u(left) && x <= u(right)) return [0xf2, 0xb6, 0x32, 255];
  }
  const dots = [[0.31, [0x7f, 0xcc, 0x6e]], [0.50, [0x5f, 0xad, 0xf2]], [0.69, [0x7f, 0xcc, 0x6e]]];
  for (const [cy, rgb] of dots) {
    if ((x - u(0.3)) ** 2 + (y - u(cy)) ** 2 <= u(0.055) ** 2) return [...rgb, 255];
  }
  return [0x1d, 0x20, 0x27, 255];
}

// --- Build ---

rmSync(dist, { recursive: true, force: true });
mkdirSync(dist, { recursive: true });
for (const f of readdirSync(join(here, "static"))) copyFileSync(join(here, "static", f), join(dist, f));
writeFileSync(join(dist, "icon.png"), png(80, icon));
writeFileSync(join(dist, "largeIcon.png"), png(130, icon));

const { config, from, extra } = loadConfig();
writeFileSync(join(dist, "config.js"), `// Built from ${from === "nothing" || from === "the demo services" ? from : "the arr-tui config"}. Holds API keys: keep this package private.\nwindow.ARR_TUI_CONFIG = ${JSON.stringify(config, null, 2)};\n${extra}`, { mode: 0o600 });

await esbuild.build({
  entryPoints: [join(here, "src", "main.ts")],
  bundle: true,
  outfile: join(dist, "app.js"),
  format: "iife",
  target,
  minify: !flag("--dev"),
  sourcemap: flag("--dev") ? "inline" : false,
  legalComments: "none",
  logLevel: "warning",
});

const services = ["radarr", "sonarr", "sabnzbd"].filter((s) => config[s].url).join(", ") || "none";
console.log(`dist/ built (config from ${from}; services: ${services}${config.trakt.client_id ? ", Trakt" : ""})`);