#!/usr/bin/env node
/*
 * make-composition.cjs — compile plan.json → index.html (CINEMATIC MODE).
 *
 * DNA path (canonical): plan.dna names a dna/<name>.json → modes/cinematic/engine.html
 * is compiled with scene-resolved tokens (lib-dna.cjs): scene-sampled accent, light-
 * direction contact shadow, depth-match blur, hero three-act orchestration with
 * RMS-coupled amplitude. plan.template="cinematic-cream" maps to dna "cream".
 *
 * Legacy path: plan.template naming an archived template dir still compiles 1:1
 * (memory-wall / champion / portrait-header in modes/cinematic/_archive are NOT
 * auto-discovered — restore them to modes/cinematic/ to use).
 *
 *   node make-composition.cjs <project-dir>
 */
const path = require("path");
const fs = require("fs");
const cp = require("child_process");
const dnaLib = require("./lib-dna.cjs");

const SKILL_ROOT = path.resolve(__dirname, "..");
const TEMPLATES = path.join(SKILL_ROOT, "modes", "cinematic");

// Source clip duration (seconds) via ffprobe. The COMPOSITION/background length must
// follow the SOURCE, not the last caption — see the Bug-1 note in main().
function sourceDurationSec(project) {
  let cands = ["source.mp4"];
  try {
    cands = cands.concat(
      fs
        .readdirSync(project)
        .filter(
          (f) =>
            /\.(mp4|mov|webm|mkv|m4v)$/i.test(f) &&
            !/^(final|bg_plus_caps|fg_caps|rail|index)/.test(f),
        ),
    );
  } catch {}
  for (const c of cands) {
    const p = path.isAbsolute(c) ? c : path.join(project, c);
    if (!fs.existsSync(p)) continue;
    try {
      const out = cp
        .execFileSync(
          "ffprobe",
          [
            "-v",
            "error",
            "-show_entries",
            "format=duration",
            "-of",
            "default=nokey=1:noprint_wrappers=1",
            "--",
            p,
          ],
          { encoding: "utf8" },
        )
        .trim();
      const d = parseFloat(out);
      if (d > 0) return d;
    } catch {}
  }
  return null;
}

function hexLum(hex) {
  let h = String(hex).replace("#", "");
  if (h.length === 3) h = [...h].map((c) => c + c).join("");
  const r = parseInt(h.slice(0, 2), 16) / 255,
    g = parseInt(h.slice(2, 4), 16) / 255,
    b = parseInt(h.slice(4, 6), 16) / 255;
  if ([r, g, b].some(Number.isNaN)) return 0.9;
  return 0.299 * r + 0.587 * g + 0.114 * b;
}
const defaultTextShadow = (c) =>
  hexLum(c) < 0.45
    ? "0 2px 6px rgba(0, 0, 0, 0.28)"
    : "0 0 18px rgba(255, 220, 170, 0.55), 0 3px 8px rgba(0, 0, 0, 0.85)";
const defaultTextFilter = (c) =>
  hexLum(c) < 0.45 ? "contrast(1.08)" : "brightness(1.1) contrast(1.05)";

function findTemplate(name) {
  const p = path.join(TEMPLATES, name, "template.html");
  if (fs.existsSync(p)) return p;
  const avail = fs
    .readdirSync(TEMPLATES)
    .filter((d) => fs.existsSync(path.join(TEMPLATES, d, "template.html")))
    .sort();
  console.error(`[compile] unknown template: ${name}. Available: ${avail.join(", ")}`);
  process.exit(1);
}
function escBr(t) {
  const e = String(t)
    .replace(/&/g, "&amp;")
    .replace(/</g, "&lt;")
    .replace(/>/g, "&gt;")
    .replace(/"/g, "&quot;");
  return e
    .replace(/&lt;br&gt;/g, "<br>")
    .replace(/&lt;br\/&gt;/g, "<br>")
    .replace(/&lt;br \/&gt;/g, "<br>");
}
// hero words get per-letter inner spans (<span class="l">) so the engine can stagger
// letters; .w keeps wrapping the word so every gate (occlusion / overflow / layout)
// measures exactly what it measured before.
function wordSpan(w, i, perLetter) {
  if (!perLetter) return `<span class="w" data-i="${i}">${escBr(w.text)}</span>`;
  const t = String(w.text);
  if (/<br\s*\/?>/i.test(t)) return `<span class="w" data-i="${i}">${escBr(t)}</span>`; // explicit <br> words stay whole
  const letters = [...t]
    .map((ch) => (ch === " " ? " " : `<span class="l">${escBr(ch)}</span>`))
    .join("");
  return `<span class="w" data-i="${i}">${letters}</span>`;
}
function renderCap(g, heroCfg) {
  const slot = g.slot ?? g.style ?? "";
  const layerAttr = g.layer ? ` data-layer="${g.layer}"` : "";
  const isHero = heroCfg && g.hero === true;
  const perLetter = isHero && heroCfg.perLetter;
  const cls = slot ? `cap cap-${slot}` : "cap";
  const spans = g.words.map((w, i) => wordSpan(w, i, perLetter)).join("\n            ");
  const capDiv = `<div id="${g.id}" class="${cls}"${layerAttr}>\n            ${spans}\n          </div>`;
  if (!isHero) return capDiv;
  // fx siblings render UNDER the hero (earlier sibling = beneath): glow first, then
  // echoes, then the hero itself. Plain .w spans; none are in plan.groups → gates skip.
  const plainSpans = g.words
    .map((w, i) => `<span class="w" data-i="${i}">${escBr(w.text)}</span>`)
    .join("\n            ");
  const parts = [];
  if (heroCfg.glow)
    parts.push(
      `<div id="${g.id}-glow" class="${cls} hero-glow" aria-hidden="true"${layerAttr}>\n            ${plainSpans}\n          </div>`,
    );
  (heroCfg.echoes || []).forEach((ec, k) => {
    parts.push(
      `<div id="${g.id}-echo-${k}" class="${cls} hero-echo" aria-hidden="true"${layerAttr}>\n            ${plainSpans}\n          </div>`,
    );
  });
  parts.push(capDiv);
  return parts.join("\n          ");
}
function buildGroupsHtml(groups, planes, heroCfg) {
  if (!planes) return groups.map((g) => renderCap(g, heroCfg)).join("\n        ");
  const order = Object.keys(planes);
  const grouped = {};
  order.forEach((p) => (grouped[p] = []));
  const free = [];
  for (const g of groups) {
    const pid = g.plane;
    if (pid && pid in grouped) grouped[pid].push(g);
    else free.push(g);
  }
  const parts = [];
  for (const pid of order)
    parts.push(
      `<div id="plane-${pid}" class="plane plane-${pid}">\n          ${grouped[pid].map((g) => renderCap(g, heroCfg)).join("\n          ")}\n        </div>`,
    );
  for (const g of free) parts.push(renderCap(g, heroCfg));
  return parts.join("\n        ");
}
function buildPlanesCss(planes) {
  if (!planes) return "";
  return Object.entries(planes)
    .map(([pid, p]) => {
      // Accept BOTH plane shapes: { body: { css: "..." } } and the bare-string
      // { body: "..." } (matches how groups write css). Reading only p.css silently
      // dropped the string form → empty CSS → planes collapsed to (0,0).
      let css = (typeof p === "string" ? p : (p || {}).css || "").trim();
      if (!css) return null;
      if (!css.endsWith(";")) css += ";";
      return `      .plane-${pid} { ${css} }`;
    })
    .filter(Boolean)
    .join("\n");
}
function buildPerGroupCss(groups, tokens) {
  return groups
    .map((g) => {
      const parts = [];
      if (g.scale != null) parts.push(`--s: ${g.scale};`);
      let css = (g.css || "").trim();
      if (css) parts.push(css.endsWith(";") ? css : css + ";");
      const isHero = tokens && g.hero === true;
      if (isHero) {
        // DNA hero treatment (case / tracking / extra css) — authored css still wins (it comes first? no: later rules win; DNA goes first so the author can override)
        const dnaHero = [];
        if (tokens.heroCase && tokens.heroCase !== "none")
          dnaHero.push(`text-transform: ${tokens.heroCase};`);
        if (tokens.heroTracking && tokens.heroTracking !== "0")
          dnaHero.push(`letter-spacing: ${tokens.heroTracking};`);
        if (tokens.heroCss)
          dnaHero.push(tokens.heroCss.endsWith(";") ? tokens.heroCss : tokens.heroCss + ";");
        if (tokens.hero && tokens.hero.heroColor) dnaHero.push(`color: ${tokens.hero.heroColor};`);
        parts.unshift(...dnaHero);
      }
      const rules = [];
      if (parts.length) rules.push(`      #${g.id} { ${parts.join(" ")} }`);
      // fx duplicates mirror the hero's geometry exactly (same slot/absolute CSS) so a
      // flex/slot plane can't displace them; glow blur comes from .hero-glow (em-based),
      // echo colors from their own rules (they must NOT inherit a transparent text fill).
      if (isHero && tokens.hero) {
        // word-level hero treatment (e.g. chrome's gradient clip — background-clip:text
        // can't clip through composited children, so it must live ON the .w span)
        if (tokens.hero.wordCss) rules.push(`      #${g.id} .w { ${tokens.hero.wordCss} }`);
        if (tokens.hero.glow > 0 && parts.length)
          rules.push(`      #${g.id}-glow { ${parts.join(" ")} }`);
        (tokens.hero.echoes || []).forEach((ec, k) => {
          const extra =
            `color: ${ec.color}; -webkit-text-fill-color: ${ec.color}; background: none;` +
            (ec.blur ? ` filter: blur(${ec.blur}px);` : "");
          rules.push(`      #${g.id}-echo-${k} { ${parts.join(" ")} ${extra} }`);
        });
      }
      return rules.length ? rules.join("\n") : null;
    })
    .filter(Boolean)
    .join("\n");
}
function buildGroupsJson(groups) {
  return JSON.stringify(
    groups.map((g) => ({
      id: g.id,
      in: g.in,
      out: g.out,
      tone: g.tone ?? "soft",
      ...(g.hero === true ? { hero: true } : {}),
      ...(g.minor === true ? { minor: true } : {}),
      ...(g.plane ? { plane: g.plane } : {}),
      words: g.words.map((w) => ({ text: w.text, start: w.start, end: w.end })),
    })),
    null,
    10,
  );
}

function main() {
  const project = path.resolve(process.argv[2] || "");
  if (!process.argv[2]) {
    console.error("usage: make-composition.cjs <project-dir>");
    process.exit(1);
  }
  const planPath = path.join(project, "plan.json");
  if (!fs.existsSync(planPath)) {
    console.error(`[compile] missing ${planPath}`);
    process.exit(1);
  }
  const plan = JSON.parse(fs.readFileSync(planPath, "utf8"));
  if (plan.mode === "custom") {
    console.error("[compile] mode=custom — skip this script and hand-write index.html.");
    process.exit(1);
  }
  if (plan.mode === "standard") {
    console.error(
      "[compile] mode=standard — this plan.json is DERIVED by make-standard.cjs; compile Standard projects with make-standard.cjs (from standard.json), not this script.",
    );
    process.exit(1);
  }
  // ── DNA resolution: plan.dna (canonical) or a legacy template name ──────────
  const dnaName = plan.dna || dnaLib.LEGACY[plan.template] || null;
  let dna = null,
    tokens = null;
  if (dnaName) {
    try {
      dna = dnaLib.load(dnaName);
    } catch (e) {
      console.error(`[compile] ${e.message}`);
      process.exit(1);
    }
  }
  const heroGroups = (plan.groups || []).filter((x) => x.hero === true);
  if (dna) {
    tokens = dnaLib.resolveTokens(dna, project, { heroGroups });
    console.log(
      `[compile] DNA "${dna.name}" (${tokens.register}) — accent ${tokens.accent}` +
        `${tokens.blurPx ? ` · depth-match blur ${tokens.blurPx}px` : ""}` +
        `${tokens.heroes.length ? ` · hero amp ${tokens.heroes.map((h) => h.amp).join("/")} (RMS-coupled)` : ""}`,
    );
  }
  let src = dna
    ? fs.readFileSync(path.join(TEMPLATES, "engine.html"), "utf8")
    : fs.readFileSync(findTemplate(plan.template), "utf8");
  // Bug-1: the canvas/background length = SOURCE clip length, NOT the last-caption time.
  // If plan.duration < source, the bg video ends before the matte → the tail shows only
  // the foreground subject on black. Caption groups keep their own in/out (they may end
  // earlier); only the composition duration follows the source.
  const srcDur = sourceDurationSec(project);
  const renderDur = srcDur && srcDur > 0 ? srcDur : plan.duration;
  if (srcDur && Math.abs(srcDur - (plan.duration || 0)) > 0.2)
    console.log(
      `[compile] canvas duration → source length ${renderDur.toFixed(2)}s (plan.duration=${plan.duration}); captions keep their own times.`,
    );
  const plane = plan.plane || {},
    header = plan.header || {},
    crown = plan.crown || {};
  // LOCKED DNA — the plan can NOT override colour / blend / shadow / filter. Picking a
  // DNA commits to its visual identity; only layout + per-group typography stay
  // agent-authored. If a scene's luminance fights the look, pick a DIFFERENT DNA
  // (bright scene → "ink") — never recolour this one. (plan.cap_color / blend_mode /
  // text_shadow / text_filter are intentionally ignored.)
  const capColor = tokens ? tokens.capColor : "#fff5df";
  const g = (o, k, d) => (o && o[k] != null ? o[k] : d);
  const heroCfg =
    tokens && tokens.heroes && tokens.heroes.length
      ? {
          perLetter: tokens.heroes[0].perLetter,
          glow: tokens.heroes[0].glow,
          echoes: tokens.heroes[0].echoes || [],
        }
      : null;
  const subs = {
    DURATION: `${renderDur}`,
    FPS: `${plan.fps ?? 24}`,
    WIDTH: `${plan.width}`,
    HEIGHT: `${plan.height}`,
    FONT_SCALE: `${plan.font_scale ?? 1.0}`,
    PLANE_TOP: `${g(plane, "top", 0)}`,
    PLANE_LEFT: `${g(plane, "left", "")}`,
    PLANE_RIGHT: `${g(plane, "right", "")}`,
    PLANE_WIDTH: `${g(plane, "width", 0)}`,
    PLANE_HEIGHT: `${g(plane, "height", 0)}`,
    ROTATE_Y: `${g(plane, "rotateY", 0)}`,
    ROTATE_X: `${g(plane, "rotateX", 0)}`,
    HEADER_TOP: `${g(header, "top", 0)}`,
    HEADER_HEIGHT: `${g(header, "height", 0)}`,
    CROWN_TOP: `${g(crown, "top", plan.crown_top ?? g(plan.crown_position || {}, "top", 440))}`,
    CROWN_LEFT: `${g(crown, "left", 0)}`,
    CROWN_RIGHT: `${g(crown, "right", 0)}`,
    CROWN_ALIGN: `${g(crown, "align", "center")}`,
    CROWN_SCALE: `${g(crown, "scale", 1.0)}`,
    BLEND_MODE: tokens ? tokens.blend : "screen",
    CAP_COLOR: capColor,
    TEXT_SHADOW: tokens ? tokens.textShadow : defaultTextShadow(capColor),
    TEXT_FILTER: tokens ? tokens.filterBg : defaultTextFilter(capColor),
    // engine-only placeholders (legacy templates simply don't contain them)
    FONT_FAMILY: tokens ? tokens.fontFamily : "Inter",
    ACCENT: tokens ? tokens.accent : "#e3c06a",
    TEXT_FILTER_BG: tokens ? tokens.filterBg : defaultTextFilter(capColor),
    TEXT_FILTER_FG: tokens ? tokens.filterFg : defaultTextFilter(capColor),
    DNA_CSS: tokens && tokens.dnaCss ? tokens.dnaCss : "",
    MOTION_JSON: JSON.stringify(
      tokens
        ? tokens.motion
        : {
            soft: { y: 8, dur: 0.45, ease: "power2.out" },
            present: { y: 6, scale: 1.04, dur: 0.22, ease: "power3.out" },
          },
    ),
    HEROES_JSON: tokens && tokens.heroes ? JSON.stringify(tokens.heroes) : "[]",
    HERO_JSON: tokens && tokens.hero ? JSON.stringify(tokens.hero) : "null",
    GROUPS_HTML: buildGroupsHtml(plan.groups, plan.planes, heroCfg),
    PLANES_CSS: buildPlanesCss(plan.planes),
    CUSTOM_CSS: buildPerGroupCss(plan.groups, tokens),
    GROUPS_JSON: buildGroupsJson(plan.groups),
  };
  const cg = plan.crown_group;
  if (cg) {
    const layerAttr = cg.layer ? ` data-layer="${cg.layer}"` : "";
    const spans = cg.words
      .map((w, i) => `<span class="w" data-i="${i}">${escBr(w.text)}</span>`)
      .join("\n          ");
    subs.CROWN_HTML = `<div id="${cg.id}" class="cap cap-crown"${layerAttr}>\n          ${spans}\n        </div>`;
    subs.CROWN_JSON = JSON.stringify(
      {
        id: cg.id,
        in: cg.in,
        out: cg.out,
        tone: cg.tone ?? "present",
        words: cg.words.map((w) => ({ text: w.text, start: w.start, end: w.end })),
      },
      null,
      10,
    );
  } else {
    subs.CROWN_HTML = "";
    subs.CROWN_JSON = "null";
  }

  for (const [k, v] of Object.entries(subs)) src = src.split(`{{${k}}}`).join(v);
  fs.writeFileSync(path.join(project, "index.html"), src);
  console.log(
    `[compile] ${dna ? `dna=${dna.name} (engine)` : `template=${plan.template}`} → ${path.join(project, "index.html")}`,
  );

  // per-group FG → index_fg.html (same strategy as the Python version)
  const fgGroups = plan.groups.filter((x) => x.layer === "fg");
  if (fgGroups.length || (plan.crown_group || {}).layer === "fg") {
    const fgCss = `
    <style>
      html.fg-only body { background: #000 !important; }
      html.fg-only #fg-cover { position: absolute; inset: 0; background: #000; z-index: 1; pointer-events: none; }
      /* visibility (not display:none): GSAP's transform parser needs a laid-out box at
         construction time — display:none here crashed timeline build in headless preview */
      html.fg-only .cap:not([data-layer="fg"]) { visibility: hidden !important; }
    </style>
`;
    let fg = src.replace("<html ", '<html class="fg-only" ');
    fg = fg.replace("</head>", fgCss + "  </head>");
    fg = fg.replace('<div id="stage"', '<div id="fg-cover"></div>\n      <div id="stage"');
    fs.writeFileSync(path.join(project, "index_fg.html"), fg);
    console.log(
      `[compile] ${fgGroups.length} fg group(s) → ${path.join(project, "index_fg.html")}`,
    );
  }
}
main();
