#!/usr/bin/env node
/**
 * Generate a ready-to-import OBS scene collection for this bundle.
 *
 * The output mirrors the proven nested-scene architecture:
 *   - a program scene (placeholder + ticker) and a break scene
 *     (break slide + ticker) shared by all six driven scenes,
 *   - six driven scenes, each stacking AdOverlay (bottom, full-size,
 *     identical everywhere) under the nested program/break scene,
 *   - Move + Stinger transitions, which obs-websocket cannot create.
 *
 * All geometry comes from src/shared/obs-geometry.mjs — the same module the
 * graphics render from — so OBS transforms can never drift from the pixels.
 *
 * Usage:
 *   node scripts/generate-obs-scenes.mjs [options]
 *
 * Options:
 *   --config <path>       bundle cfg JSON to read scene/transition/source
 *                         names from (e.g. ../../cfg/<bundle>.json)
 *   --out <path>          output file (default obs/generated/<name>.json)
 *   --name <name>         scene collection name (default "VenueGfx")
 *   --nodecg-url <url>    NodeCG base URL (default http://localhost:9090)
 *   --bundle <name>       bundle name for graphics URLs (default: package.json)
 *   --stinger <path>      absolute path to the stinger video (default: a
 *                         placeholder you MUST replace in OBS)
 *   --move-duration <ms>  Move transition duration (default 700)
 *   --transition-point <ms>  stinger transition point (default 1200)
 *   --ticker-offset-y <px>   ticker Y offset in the nested scenes (default 0)
 *
 * Import in OBS: Scene Collection → Import, pick the file, then switch to it.
 * Afterwards: replace the "Program Placeholder" source inside the program
 * scene with your real capture, and point the Stinger transition at a real
 * video file if you passed no --stinger.
 */

import { randomUUID } from "node:crypto";
import { mkdirSync, readFileSync, writeFileSync } from "node:fs";
import { dirname, join, resolve } from "node:path";
import { fileURLToPath } from "node:url";

import {
  CANVAS,
  DEFAULT_MOVE_DURATION_MS,
  DEFAULT_SCENE_NAMES,
  DEFAULT_SOURCE_NAMES,
  DEFAULT_STINGER_POINT_MS,
  DEFAULT_TRANSITION_NAMES,
  MOVE_TRANSITION_KIND,
  MOVE_TRANSITION_SETTINGS,
  STINGER_TRANSITION_KIND,
  TICKER_OFFSET_Y,
  expectedSceneModel,
  graphicUrls,
  stingerSettings,
} from "../src/shared/obs-geometry.mjs";

const bundleRoot = resolve(dirname(fileURLToPath(import.meta.url)), "..");

// Matches the OBS version the reference fixture was saved by (32.x); OBS
// uses it to decide which config migrations to run on load.
const PREV_VER = 536936450;
const STINGER_PLACEHOLDER = "/CHANGE/ME/stinger.webm";

// ── CLI ──────────────────────────────────────────────────────────────────

function parseArgs(argv) {
  const args = {};
  for (let i = 0; i < argv.length; i++) {
    const a = argv[i];
    if (!a.startsWith("--")) continue;
    const key = a.slice(2);
    const value =
      i + 1 < argv.length && !argv[i + 1].startsWith("--") ? argv[++i] : true;
    args[key] = value;
  }
  return args;
}

const args = parseArgs(process.argv.slice(2));

if (args.help || args.h) {
  console.log(
    readFileSync(fileURLToPath(import.meta.url), "utf8")
      .split("*/")[0]
      .split("\n")
      .filter((l) => l.startsWith(" *"))
      .map((l) => l.slice(3))
      .join("\n"),
  );
  process.exit(0);
}

const cfg = args.config
  ? JSON.parse(readFileSync(resolve(args.config), "utf8"))
  : {};

const pjson = JSON.parse(readFileSync(join(bundleRoot, "package.json"), "utf8"));

const bundleName = args.bundle ?? pjson.name;
const collectionName = args.name ?? "VenueGfx";
const nodecgUrl = args["nodecg-url"] ?? "http://localhost:9090";
const stingerPath = args.stinger ?? STINGER_PLACEHOLDER;
const moveDuration = Number(args["move-duration"] ?? DEFAULT_MOVE_DURATION_MS);
const transitionPoint = Number(
  args["transition-point"] ?? DEFAULT_STINGER_POINT_MS,
);
const tickerOffsetY = Number(args["ticker-offset-y"] ?? TICKER_OFFSET_Y);

const scenes = { ...DEFAULT_SCENE_NAMES, ...(cfg.obs?.scenes ?? {}) };
const transitions = { ...DEFAULT_TRANSITION_NAMES, ...(cfg.obs?.transitions ?? {}) };
const sources = { ...DEFAULT_SOURCE_NAMES, ...(cfg.obs?.sources ?? {}) };

const urls = graphicUrls(nodecgUrl, bundleName);
const model = expectedSceneModel({ scenes, sources, tickerOffsetY });

// ── Source builders (shapes match what OBS 32 itself saves) ─────────────

const uuids = new Map();
const uuidFor = (name) => {
  if (!uuids.has(name)) uuids.set(name, randomUUID());
  return uuids.get(name);
};

const SOURCE_COMMON = {
  prev_ver: PREV_VER,
  sync: 0,
  flags: 0,
  volume: 1.0,
  balance: 0.5,
  enabled: true,
  muted: false,
  "push-to-mute": false,
  "push-to-mute-delay": 0,
  "push-to-talk": false,
  "push-to-talk-delay": 0,
  hotkeys: {},
  deinterlace_mode: 0,
  deinterlace_field_order: 0,
  monitoring_type: 0,
  private_settings: {},
};

function browserSource(name, url) {
  return {
    ...SOURCE_COMMON,
    name,
    uuid: uuidFor(name),
    id: "browser_source",
    versioned_id: "browser_source",
    settings: { url, width: CANVAS.w, height: CANVAS.h },
    mixers: 255,
  };
}

function colorSource(name) {
  return {
    ...SOURCE_COMMON,
    name,
    uuid: uuidFor(name),
    id: "color_source",
    versioned_id: "color_source_v3",
    // opaque dark gray so an untouched placeholder is visible but calm
    settings: { color: 4280492319, width: CANVAS.w, height: CANVAS.h },
    mixers: 0,
  };
}

/** Scene-item transform boilerplate, canonical top-left alignment. */
function sceneItem(expectedItem, id) {
  const { pos, scale } = expectedItem;
  const halfH = CANVAS.h / 2;
  return {
    name: expectedItem.source,
    source_uuid: uuidFor(expectedItem.source),
    visible: true,
    locked: false,
    rot: 0.0,
    scale_ref: { x: CANVAS.w, y: CANVAS.h },
    align: 5, // top-left
    bounds_type: 0,
    bounds_align: 0,
    bounds_crop: false,
    crop_left: 0,
    crop_top: 0,
    crop_right: 0,
    crop_bottom: 0,
    id,
    group_item_backup: false,
    pos: { x: pos.x, y: pos.y },
    pos_rel: { x: (pos.x - CANVAS.w / 2) / halfH, y: (pos.y - halfH) / halfH },
    scale: { x: scale, y: scale },
    scale_rel: { x: scale, y: scale },
    bounds: { x: 0.0, y: 0.0 },
    bounds_rel: { x: 0.0, y: 0.0 },
    scale_filter: "disable",
    blend_method: "default",
    blend_type: "normal",
    show_transition: { duration: 300 },
    hide_transition: { duration: 300 },
    private_settings: {},
  };
}

function scene(name, expectedItems) {
  return {
    ...SOURCE_COMMON,
    name,
    uuid: uuidFor(name),
    id: "scene",
    versioned_id: "scene",
    settings: {
      id_counter: expectedItems.length,
      custom_size: false,
      items: expectedItems.map((item, i) => sceneItem(item, i + 1)),
    },
    mixers: 0,
    canvas_uuid: "6c69626f-6273-4c00-9d88-c5136d61696e", // fixed "libobs main" canvas
  };
}

// ── Assemble the collection ──────────────────────────────────────────────

const allSources = [
  browserSource(sources.ticker, urls.ticker),
  browserSource(sources.adOverlay, urls.ad),
  browserSource(sources.breakSlide, urls.break),
  colorSource(sources.programPlaceholder),
  ...Object.entries(model.nested).map(([name, items]) => scene(name, items)),
  ...Object.entries(model.driven).map(([name, items]) => scene(name, items)),
];

const collection = {
  canvases: [],
  current_program_scene: scenes.main,
  current_scene: scenes.main,
  current_transition: transitions.default,
  groups: [],
  modules: {},
  name: collectionName,
  preview_locked: false,
  quick_transitions: [
    { name: "Cut", duration: 300, hotkeys: [], id: 1, fade_to_black: false },
    { name: "Fade", duration: 300, hotkeys: [], id: 2, fade_to_black: false },
    { name: "Fade", duration: 300, hotkeys: [], id: 3, fade_to_black: true },
  ],
  resolution: { x: CANVAS.w, y: CANVAS.h },
  saved_projectors: [],
  scaling_enabled: false,
  scaling_level: 0,
  scaling_off_x: 0.0,
  scaling_off_y: 0.0,
  scene_order: [
    ...Object.keys(model.driven).map((name) => ({ name })),
    ...Object.keys(model.nested).map((name) => ({ name })),
  ],
  sources: allSources,
  transition_duration: moveDuration,
  transitions: [
    {
      name: transitions.default,
      id: MOVE_TRANSITION_KIND,
      settings: { ...MOVE_TRANSITION_SETTINGS },
    },
    {
      name: transitions.break,
      id: STINGER_TRANSITION_KIND,
      settings: stingerSettings(stingerPath, transitionPoint),
    },
  ],
  version: 2,
  "virtual-camera": { type2: 3 },
};

// ── Write ────────────────────────────────────────────────────────────────

const outPath = resolve(
  args.out ?? join(bundleRoot, "obs", "generated", `${collectionName}.json`),
);
mkdirSync(dirname(outPath), { recursive: true });
writeFileSync(outPath, JSON.stringify(collection, null, 2) + "\n");

console.log(`Scene collection written to ${outPath}`);
console.log(`
Next steps in OBS:
  1. Scene Collection → Import → pick the file above, then switch to it.
  2. Open the "${sources.programScene}" scene and replace the
     "${sources.programPlaceholder}" color source with your real capture
     (camera, window capture, …). Keep it 1920×1080 at (0,0).`);
if (stingerPath === STINGER_PLACEHOLDER) {
  console.log(`  3. ⚠ The "${transitions.break}" transition points at the placeholder
     ${STINGER_PLACEHOLDER} — set a real video in the transition dock
     (or re-run with --stinger /absolute/path/to/stinger.webm).`);
}
console.log(`
Profile checklist (Settings → Video / Output — not part of the collection):
  - Base and Output resolution ${CANVAS.w}×${CANVAS.h}
  - 60 FPS (the ticker scrolls; 30 looks choppy)
  - encoder/output to taste — the graphics don't care
Requires OBS ≥ 31 and exeldro's Move plugin (for the "${transitions.default}" transition).`);