#!/usr/bin/env node
/**
 * @managemate/tokens — build pipeline
 *
 * Source de vérité unique : src/tokens.json (format W3C DTCG).
 * Génère :
 *  - dist/tokens.css       : CSS custom properties --mmg-color-*
 *  - dist/tokens.js / .d.ts: objet JS/TS pour consommation programmatique
 *  - dist/tokens.cjs       : CommonJS
 *  - dist/figma-tokens.json: format Tokens Studio pour sync Figma
 */
import StyleDictionary from "style-dictionary";
import { mkdir, writeFile, readFile } from "node:fs/promises";
import { join, dirname } from "node:path";
import { fileURLToPath } from "node:url";
import { existsSync } from "node:fs";

const __dirname = dirname(fileURLToPath(import.meta.url));
const ROOT = __dirname;
const DIST = join(ROOT, "dist");
const SOURCE = join(ROOT, "src", "tokens.json");

if (!existsSync(DIST)) await mkdir(DIST, { recursive: true });

// — Style Dictionary config ————————————————————————————————————
const sd = new StyleDictionary({
  source: [SOURCE],
  log: { warnings: "warn", verbosity: "default" },
  platforms: {
    css: {
      transformGroup: "css",
      buildPath: "dist/",
      files: [
        {
          destination: "tokens.css",
          format: "css/variables",
          options: {
            outputReferences: false,
            selector: ":root",
          },
        },
      ],
      prefix: "mmg",
    },
    js: {
      transformGroup: "js",
      buildPath: "dist/",
      files: [
        {
          destination: "tokens.js",
          format: "javascript/esm",
        },
        {
          destination: "tokens.cjs",
          format: "javascript/module",
        },
        {
          destination: "tokens.d.ts",
          format: "typescript/es6-declarations",
        },
      ],
      prefix: "mmg",
    },
  },
});

await sd.cleanAllPlatforms();
await sd.buildAllPlatforms();

// — Figma Tokens Studio export ————————————————————————————————————
// Plugin Tokens Studio attend un format proche de DTCG mais avec une
// structure aplatie : { "color/neutral/50": { "value": "...", "type": "color" } }
const dtcg = JSON.parse(await readFile(SOURCE, "utf8"));

function flatten(obj, prefix = "") {
  const out = {};
  for (const [k, v] of Object.entries(obj)) {
    if (k.startsWith("$")) continue;
    const path = prefix ? `${prefix}/${k}` : k;
    if (v && typeof v === "object" && "$value" in v) {
      out[path] = { value: v.$value, type: v.$type };
    } else if (v && typeof v === "object") {
      Object.assign(out, flatten(v, path));
    }
  }
  return out;
}

const figmaTokens = {
  global: flatten(dtcg),
  $themes: [],
  $metadata: {
    tokenSetOrder: ["global"],
    generatedAt: new Date().toISOString(),
    generatedBy: "@managemate/tokens build.mjs",
  },
};

await writeFile(join(DIST, "figma-tokens.json"), JSON.stringify(figmaTokens, null, 2));

// — Tailwind v3 export (theme.extend JSON) ————————————————————————
function buildTailwindV3() {
  const colors = {};
  for (const [name, ramp] of Object.entries(dtcg.color ?? {})) {
    if (!ramp || typeof ramp !== "object") continue;
    const shades = {};
    for (const [shade, val] of Object.entries(ramp)) {
      if (val && typeof val === "object" && "$value" in val) {
        shades[shade] = val.$value;
      }
    }
    if (Object.keys(shades).length > 0) colors[name] = shades;
  }
  const spacing = {};
  for (const [k, v] of Object.entries(dtcg.spacing ?? {})) {
    if (v && typeof v === "object" && "$value" in v) {
      spacing[`mmg-${k}`] = v.$value;
    }
  }
  const radius = {};
  for (const [k, v] of Object.entries(dtcg.radius ?? {})) {
    if (v && typeof v === "object" && "$value" in v) {
      radius[`mmg-${k}`] = v.$value;
    }
  }
  const fontSize = {};
  for (const [k, v] of Object.entries(dtcg.fontSize ?? {})) {
    if (v && typeof v === "object" && "$value" in v) {
      fontSize[`mmg-${k}`] = v.$value;
    }
  }
  return {
    theme: {
      extend: {
        colors: { mmg: colors },
        spacing,
        borderRadius: radius,
        fontSize,
      },
    },
  };
}

await writeFile(
  join(DIST, "tailwind.config.json"),
  JSON.stringify(buildTailwindV3(), null, 2),
);

// — Tailwind v4 export (@theme CSS block) ————————————————————————
function buildTailwindV4() {
  const lines = ["/* DSMMG tokens — Tailwind v4 @theme block. */", "@theme {"];
  // Colors
  for (const [name, ramp] of Object.entries(dtcg.color ?? {})) {
    if (!ramp || typeof ramp !== "object") continue;
    for (const [shade, val] of Object.entries(ramp)) {
      if (val && typeof val === "object" && "$value" in val) {
        lines.push(`  --color-mmg-${name}-${shade}: ${val.$value};`);
      }
    }
  }
  // Spacing
  for (const [k, v] of Object.entries(dtcg.spacing ?? {})) {
    if (v && typeof v === "object" && "$value" in v) {
      lines.push(`  --spacing-mmg-${k}: ${v.$value};`);
    }
  }
  // Radius
  for (const [k, v] of Object.entries(dtcg.radius ?? {})) {
    if (v && typeof v === "object" && "$value" in v) {
      lines.push(`  --radius-mmg-${k}: ${v.$value};`);
    }
  }
  // Font sizes
  for (const [k, v] of Object.entries(dtcg.fontSize ?? {})) {
    if (v && typeof v === "object" && "$value" in v) {
      lines.push(`  --text-mmg-${k}: ${v.$value};`);
    }
  }
  // Durations
  for (const [k, v] of Object.entries(dtcg.duration ?? {})) {
    if (v && typeof v === "object" && "$value" in v) {
      lines.push(`  --animate-duration-mmg-${k}: ${v.$value};`);
    }
  }
  lines.push("}");
  return lines.join("\n") + "\n";
}

await writeFile(join(DIST, "tailwind.css"), buildTailwindV4());

console.log(`✓ Tokens built → ${DIST}`);
console.log(`  - tokens.css            (CSS custom properties)`);
console.log(`  - tokens.{js,cjs,d.ts}  (ESM / CJS / TypeScript)`);
console.log(`  - figma-tokens.json     (Tokens Studio for Figma sync)`);
console.log(`  - tailwind.config.json  (Tailwind v3 theme.extend)`);
console.log(`  - tailwind.css          (Tailwind v4 @theme block)`);