#!/usr/bin/env node
// DSMMG token migration codemod
// Renomme les références --mmg-* legacy vers la nomenclature --mmg-color-*.
// Sûr et idempotent : applique les mappings dans l'ordre du plus spécifique
// au plus générique (longest-match-first).
import { readFile, writeFile, readdir, stat } from "node:fs/promises";
import { join, extname } from "node:path";
import { fileURLToPath } from "node:url";
import { dirname } from "node:path";

const __dirname = dirname(fileURLToPath(import.meta.url));
const ROOT = join(__dirname, "..");

// IMPORTANT : ordre du plus long au plus court pour éviter les collisions
// (ex: --mmg-text-1 doit matcher AVANT --mmg-text-).
const MAPPINGS = [
  // — Texte (couleur) — longest first ——————————
  ["--mmg-text-inverse", "--mmg-color-text-inverse"],
  ["--mmg-text-1", "--mmg-color-text-primary"],
  ["--mmg-text-2", "--mmg-color-text-secondary"],
  ["--mmg-text-3", "--mmg-color-text-tertiary"],
  ["--mmg-text-4", "--mmg-color-text-quaternary"],

  // — Texte (font-size) — distincts ——————————
  ["--mmg-text-xs", "--mmg-font-size-xs"],
  ["--mmg-text-sm", "--mmg-font-size-sm"],
  ["--mmg-text-base", "--mmg-font-size-base"],
  ["--mmg-text-lg", "--mmg-font-size-lg"],
  ["--mmg-text-xl", "--mmg-font-size-xl"],
  ["--mmg-text-2xl", "--mmg-font-size-2xl"],
  ["--mmg-text-3xl", "--mmg-font-size-3xl"],
  ["--mmg-text-4xl", "--mmg-font-size-4xl"],
  ["--mmg-text-5xl", "--mmg-font-size-5xl"],

  // — Background ——————————
  ["--mmg-bg-page", "--mmg-color-bg-page"],
  ["--mmg-bg-surface", "--mmg-color-bg-surface"],
  ["--mmg-bg-raised", "--mmg-color-bg-raised"],
  ["--mmg-bg-muted", "--mmg-color-bg-muted"],
  ["--mmg-bg-subtle", "--mmg-color-bg-subtle"],
  ["--mmg-bg-overlay", "--mmg-color-bg-overlay"],

  // — Border ——————————
  ["--mmg-border-soft", "--mmg-color-border-soft"],
  ["--mmg-border-strong", "--mmg-color-border-strong"],
  ["--mmg-border", "--mmg-color-border"],

  // — Brand → Accent ——————————
  ["--mmg-brand-hover", "--mmg-color-accent-hover"],
  ["--mmg-brand-active", "--mmg-color-accent-active"],
  ["--mmg-brand-soft", "--mmg-color-accent-soft"],
  ["--mmg-brand-border", "--mmg-color-accent-border"],
  ["--mmg-brand-strong", "--mmg-color-accent-strong"],
  ["--mmg-brand-on", "--mmg-color-accent-on"],
  ["--mmg-brand", "--mmg-color-accent"],

  // — Semantic colors ——————————
  ["--mmg-success-soft", "--mmg-color-success-soft"],
  ["--mmg-success-border", "--mmg-color-success-border"],
  ["--mmg-success-strong", "--mmg-color-success-strong"],
  ["--mmg-success-on", "--mmg-color-success-on"],
  ["--mmg-success", "--mmg-color-success"],
  ["--mmg-warning-soft", "--mmg-color-warning-soft"],
  ["--mmg-warning-border", "--mmg-color-warning-border"],
  ["--mmg-warning-strong", "--mmg-color-warning-strong"],
  ["--mmg-warning-on", "--mmg-color-warning-on"],
  ["--mmg-warning", "--mmg-color-warning"],
  ["--mmg-danger-soft", "--mmg-color-danger-soft"],
  ["--mmg-danger-border", "--mmg-color-danger-border"],
  ["--mmg-danger-strong", "--mmg-color-danger-strong"],
  ["--mmg-danger-on", "--mmg-color-danger-on"],
  ["--mmg-danger", "--mmg-color-danger"],
  ["--mmg-info-soft", "--mmg-color-info-soft"],
  ["--mmg-info-border", "--mmg-color-info-border"],
  ["--mmg-info-strong", "--mmg-color-info-strong"],
  ["--mmg-info-on", "--mmg-color-info-on"],
  ["--mmg-info", "--mmg-color-info"],

  // — Artwork ——————————
  ["--mmg-art-major", "--mmg-color-art-major"],
  ["--mmg-art-minor", "--mmg-color-art-minor"],
  ["--mmg-art-light", "--mmg-color-art-light"],
  ["--mmg-art-dark", "--mmg-color-art-dark"],
  ["--mmg-art-accent", "--mmg-color-art-accent"],

  // — État système ——————————
  ["--mmg-state-disabled-bg", "--mmg-color-state-disabled-bg"],
  ["--mmg-state-disabled-text", "--mmg-color-state-disabled-text"],
  ["--mmg-state-disabled-border", "--mmg-color-state-disabled-border"],
  ["--mmg-state-selection-bg", "--mmg-color-state-selection-bg"],
  ["--mmg-state-selection-text", "--mmg-color-state-selection-text"],

  // — Line height ——————————
  ["--mmg-leading-tight", "--mmg-line-height-tight"],
  ["--mmg-leading-snug", "--mmg-line-height-snug"],
  ["--mmg-leading-normal", "--mmg-line-height-normal"],

  // — Font weight ——————————
  ["--mmg-weight-regular", "--mmg-font-weight-regular"],
  ["--mmg-weight-medium", "--mmg-font-weight-medium"],
  ["--mmg-weight-semi", "--mmg-font-weight-semi"],
  ["--mmg-weight-bold", "--mmg-font-weight-bold"],
  ["--mmg-weight-extra", "--mmg-font-weight-extra"],

  // — Shadow accent ——————————
  ["--mmg-shadow-brand-hover", "--mmg-shadow-accent-hover"],
  ["--mmg-shadow-brand-soft", "--mmg-shadow-accent-soft"],
  ["--mmg-shadow-brand", "--mmg-shadow-accent"],
];

// Cibles : tous les .css et .tsx hors node_modules / dist / tokens (déjà OK)
const TARGET_DIRS = [
  "packages/css/src/components",
  "packages/css/src", // pour base.css uniquement, on filtre tokens via skip
  "packages/react/src",
  "demo/src",
];
const SKIP_FILES = new Set([
  // Les nouveaux tokens sont déjà à la nouvelle nomenclature.
  "tokens.css",
  "primitives.css",
  "semantic.css",
  "accent.css",
  "system.css",
]);
const EXTS = new Set([".css", ".tsx", ".ts"]);

async function* walk(dir) {
  const entries = await readdir(dir, { withFileTypes: true });
  for (const e of entries) {
    if (e.name === "node_modules" || e.name === "dist") continue;
    const full = join(dir, e.name);
    if (e.isDirectory()) yield* walk(full);
    else yield full;
  }
}

function migrate(content) {
  let out = content;
  let count = 0;
  for (const [from, to] of MAPPINGS) {
    // Word-boundary safe : --mmg-brand ne doit PAS matcher dans --mmg-brand-soft.
    // Comme MAPPINGS est trié longest-first, lorsque --mmg-brand est traité,
    // les longs ont déjà été remplacés. Mais on ajoute un lookahead négatif
    // pour les caractères pouvant prolonger un identifiant CSS (-, lettre, chiffre).
    const re = new RegExp(escape(from) + "(?![\\w-])", "g");
    const matches = out.match(re);
    if (matches) {
      count += matches.length;
      out = out.replace(re, to);
    }
  }
  return { out, count };
}

function escape(s) {
  return s.replace(/[.*+?^${}()|[\]\\]/g, "\\$&");
}

async function main() {
  let totalReplacements = 0;
  let touched = 0;
  for (const rel of TARGET_DIRS) {
    const dir = join(ROOT, rel);
    try {
      await stat(dir);
    } catch {
      continue;
    }
    for await (const file of walk(dir)) {
      const ext = extname(file);
      if (!EXTS.has(ext)) continue;
      const base = file.split(/[\\/]/).pop();
      if (SKIP_FILES.has(base)) continue;
      const content = await readFile(file, "utf8");
      const { out, count } = migrate(content);
      if (count > 0) {
        await writeFile(file, out, "utf8");
        touched += 1;
        totalReplacements += count;
        console.log(`  ${count.toString().padStart(4)} ${file.replace(ROOT, "")}`);
      }
    }
  }
  console.log(`\n✓ ${totalReplacements} replacements across ${touched} files`);
}

main().catch((err) => {
  console.error(err);
  process.exit(1);
});