#!/usr/bin/env node
/**
 * Syncs skills from @salesforce/webapp-template-* and @salesforce/webapps-features-experimental
 * into skills/<finalSkillName>/ (flat: one folder per skill).
 * Each skill's SKILL.md frontmatter "name:" is set to the final skill name.
 * Discovers packages by scanning devDependencies; for each, copies from
 * skills/, .a4drules/skills/, and .agents/skills/ (if present). Run from repo root after npm install.
 */

const fs = require('fs');
const path = require('path');
const { copyRecursive } = require('./lib/copy-recursive');
const {
  packageNameToSlug,
  cleanPackageSlug,
  finalSkillName,
  matchingDeps,
} = require('./lib/package-utils');

const SKILL_ROOTS = ['skills', '.a4drules/skills', '.agents/skills'];
const VERSIONS_FILE = '.template-versions.json';

/** Update SKILL.md frontmatter name: to match the final skill folder name. */
function updateSkillName(skillDir, name) {
  const skillMd = path.join(skillDir, 'SKILL.md');
  if (!fs.existsSync(skillMd)) return;
  let content = fs.readFileSync(skillMd, 'utf8');
  content = content.replace(/^name:\s*.*$/m, 'name: ' + name);
  fs.writeFileSync(skillMd, content, 'utf8');
}

const repoRoot = process.cwd();
const pkg = JSON.parse(fs.readFileSync(path.join(repoRoot, 'package.json'), 'utf8'));
const packageNames = matchingDeps(pkg);

const skillsDir = path.join(repoRoot, 'skills');
if (!fs.existsSync(skillsDir)) fs.mkdirSync(skillsDir, { recursive: true });

// Remove all salesforce-webapp-* skill dirs (they are exclusively generated by
// this script) so renamed or removed skills don't linger between runs.
for (const entry of fs.readdirSync(skillsDir)) {
  if (!entry.startsWith('salesforce-webapp-')) continue;
  const entryPath = path.join(skillsDir, entry);
  if (fs.statSync(entryPath).isDirectory()) {
    fs.rmSync(entryPath, { recursive: true });
  }
}

const versions = {};

for (const packageName of packageNames) {
  const pkgRoot = path.join(repoRoot, 'node_modules', packageName.replace('/', path.sep));
  if (!fs.existsSync(pkgRoot)) {
    console.warn(`Skip ${packageName}: not found in node_modules. Run "npm install" first.`);
    continue;
  }

  const innerPkg = JSON.parse(
    fs.readFileSync(path.join(pkgRoot, 'package.json'), 'utf8')
  );
  versions[packageName] = innerPkg.version || 'unknown';

  const packageSlug = packageNameToSlug(packageName);
  const cleanedSlug = cleanPackageSlug(packageSlug);

  for (const root of SKILL_ROOTS) {
    const srcRoot = path.join(pkgRoot, root);
    if (!fs.existsSync(srcRoot) || !fs.statSync(srcRoot).isDirectory()) continue;

    for (const innerName of fs.readdirSync(srcRoot)) {
      const srcSkillDir = path.join(srcRoot, innerName);
      if (!fs.statSync(srcSkillDir).isDirectory()) continue;

      const name = finalSkillName(cleanedSlug, innerName);
      const destDir = path.join(skillsDir, name);

      if (fs.existsSync(destDir)) fs.rmSync(destDir, { recursive: true });
      fs.mkdirSync(destDir, { recursive: true });
      for (const entry of fs.readdirSync(srcSkillDir)) {
        copyRecursive(path.join(srcSkillDir, entry), path.join(destDir, entry));
      }
      updateSkillName(destDir, name);
      console.log(`Synced ${packageName}/${innerName} -> skills/${name}/`);
    }
  }
}

fs.writeFileSync(
  path.join(skillsDir, VERSIONS_FILE),
  JSON.stringify(versions, null, 2) + '\n',
  'utf8'
);
console.log(`Wrote ${VERSIONS_FILE} with ${Object.keys(versions).length} package version(s).`);