#!/usr/bin/env node

/**
 * Build System for Cross-Provider Design Skills
 *
 * Transforms source skills into provider-specific formats:
 * - Cursor: .cursor/skills/
 * - Claude Code: .claude/skills/
 * - Gemini: .gemini/skills/
 * - Codex: dist/codex/ only (OpenAI-metadata bundle; not synced to repo root)
 * - Agents: .agents/skills/ (Codex repo/user installs)
 * - GitHub: .github/skills/ (GitHub Copilot)
 *
 * Also assembles a universal ZIP containing all providers,
 * and builds Tailwind CSS for production deployment.
 */

import path from 'path';
import fs from 'fs';
import { fileURLToPath } from 'url';
import { readSourceFiles, readPatterns, stashPerProjectArtifacts, restorePerProjectArtifacts } from './lib/utils.js';
import { createTransformer, PROVIDERS } from './lib/transformers/index.js';
import { createAllZips } from './lib/zip.js';
import { ANTIPATTERNS } from '../cli/engine/registry/antipatterns.mjs';
// Sub-page generation is now handled by Astro content collections.

/**
 * Generate authoritative counts from source data and write to site/public/js/generated/counts.js.
 * Also validates that key HTML files reference the correct numbers.
 */
function generateCounts(rootDir, skills, buildDir) {
  // Count active commands. After the v3.0 consolidation, commands are sub-commands
  // of /impeccable. Count them from the command router table in SKILL.md.
  const impeccableSkill = skills.find(s => s.name === 'impeccable');
  let commandCount;
  if (impeccableSkill) {
    // Count lines in the command table that start with | `...` | — tolerant
    // of argument hints inside the backticks (e.g. `craft [feature]`) and of
    // multi-word commands (e.g. `pin <command>`).
    const routerMatches = impeccableSkill.body.match(/^\| `[^`]+` \|/gm);
    commandCount = routerMatches ? routerMatches.length : 0;
  } else {
    // Fallback: count user-invocable skills
    const activeCommands = skills.filter(s => {
      if (!s.userInvocable) return false;
      const content = fs.readFileSync(s.filePath, 'utf-8');
      return !content.includes('DEPRECATED');
    });
    commandCount = activeCommands.length;
  }

  // Count detection rules from the detector registry.
  const detectionCount = new Set(ANTIPATTERNS.map(rule => rule.id)).size;

  // Write generated counts module
  const genDir = path.join(rootDir, 'site/public/js/generated');
  fs.mkdirSync(genDir, { recursive: true });
  fs.writeFileSync(path.join(genDir, 'counts.js'),
    `// GENERATED by build.js — do not edit\n` +
    `export const COMMAND_COUNT = ${commandCount};\n` +
    `export const DETECTION_COUNT = ${detectionCount};\n`
  );

  // Validate counts in key files
  const filesToCheck = [
    'site/pages/index.astro',
    'README.md',
    'NOTICE.md',
    'AGENTS.md',
    '.claude-plugin/plugin.json',
    '.claude-plugin/marketplace.json',
  ];

  let errors = 0;
  for (const relPath of filesToCheck) {
    const absPath = path.join(rootDir, relPath);
    if (!fs.existsSync(absPath)) continue;
    const content = fs.readFileSync(absPath, 'utf-8');

    // Check for stale command counts (look for "N commands" or "N skills" patterns)
    // Strip changelog list content to avoid flagging historical counts
    const strippedContent = content.replace(/<ul class="changelog-items">[\s\S]*?<\/ul>/g, '');
    const countPattern = /\b(\d+)\s+(design\s+)?(commands|sub-commands|skills|steering commands)/gi;
    for (const match of strippedContent.matchAll(countPattern)) {
      const num = parseInt(match[1]);
      // Allow 1 (for "1 skill") and the correct count
      if (num !== commandCount && num !== 1) {
        console.error(`  ❌ ${relPath}: found "${match[0]}" but active command count is ${commandCount}`);
        errors++;
      }
    }

    // Check for stale detection counts. Use the changelog-stripped content
    // so historical counts in changelog entries (e.g. "28 rules" from an
    // older release) don't flag against the current detector total.
    const detectPattern = /\b(\d+)\s+(deterministic\s+)?(checks|patterns|rules|detections)/gi;
    for (const match of strippedContent.matchAll(detectPattern)) {
      const num = parseInt(match[1]);
      if (num !== detectionCount && num > 10) { // ignore small numbers like "3 patterns"
        console.error(`  ❌ ${relPath}: found "${match[0]}" but detection count is ${detectionCount}`);
        errors++;
      }
    }
  }

  if (errors > 0) {
    console.error(`\n❌ ${errors} stale count reference(s) found. Update them to match source of truth.`);
  }

  console.log(`✓ Generated counts: ${commandCount} commands, ${detectionCount} detection rules`);
  return errors;
}

function validateSkillFrontmatter(skills) {
  let errors = 0;

  for (const skill of skills) {
    if (skill.description && skill.description.length > 1024) {
      console.error(`❌ ${skill.filePath}: invalid description: exceeds maximum length of 1024 characters (${skill.description.length})`);
      errors++;
    }
  }

  return errors;
}

/**
 * Scan user-facing copy for AI-prose anti-patterns:
 *   - em dashes (— or &mdash;)
 *   - double-hyphen substitutes (` -- `)
 *   - denylisted phrases that read as AI tells in marketing copy
 *
 * The denylist is the editorial brief in STYLE.md, enforced. Each rule has a
 * rationale that prints with the failure so the next author understands why.
 *
 * Scope: every surface a reader sees. Not skill/, where
 * LLM-facing reference instructions can use technical phrasings the marketing
 * copy can't.
 *
 * Returns the number of occurrences found. Build fails if > 0.
 */
function validateProse(rootDir) {
  const targets = [
    'site/components',
    'site/content',
    'site/layouts',
    'site/pages',
    'README.md',
    'README.npm.md',
  ];
  const extensions = new Set(['.html', '.md', '.js', '.mjs', '.css', '.astro']);
  const emDashPatterns = [/—/g, /&mdash;/gi, /&#8212;/gi, /&#x2014;/gi];
  // Phrase rules: { re, rationale }. Add to STYLE.md when adding here.
  const phraseRules = [
    { re: /\bload-bearing\b/i, rationale: 'AI tell. Stolen-engineer diction; almost always vague. Name what the thing actually does.' },
    { re: /\bhighest-leverage\b/i, rationale: 'AI tell. Vague claim of impact. Say what specifically pays off.' },
    { re: /\bbiggest unlock\b/i, rationale: 'AI tell. Marketing-speak. Describe the actual change.' },
    { re: /\breflex defaults?\b/i, rationale: 'Internal jargon leaking into user-facing copy. Say "instincts" or "first guesses".' },
    { re: /\bcollapses? into monoculture\b/i, rationale: 'Internal eval-speak. Describe what actually went wrong.' },
    { re: /\bdata-driven\b/i, rationale: 'Empty marketing adjective. Cite the data instead.' },
    { re: /\bseamless(?:ly)?\b/i, rationale: 'Hollow positive. Say what specifically works without friction.' },
    { re: /\brobust(?:ness)?\b/i, rationale: 'Hollow positive. Cite the failure mode it handles.' },
    { re: /\bdelves?\b|\bdelved\b|\bdelving\b/i, rationale: 'Top AI tell. Use "explore", "look at", or just delete.' },
    { re: /\belevate(?:s|d)?\b/i, rationale: 'Marketing verb. Use the specific verb (improve, raise, sharpen).' },
    { re: /\bempower(?:s|ed|ing)?\b/i, rationale: 'Marketing verb. Use "let you" or "make possible".' },
    { re: /\bunderscore(?:s|d)?\b/i, rationale: 'AI tell. Use "show" or "make clear".' },
    { re: /\bpivotal\b/i, rationale: 'Hollow positive. Use "central", "key", or describe the role.' },
    { re: /\bin today's\b/i, rationale: 'Throat-clearing opener. Cut the clause; start at the point.' },
    { re: /\bgone are the days\b/i, rationale: 'Throat-clearing. Make the point directly.' },
    { re: /\bwhether you're\b/i, rationale: 'Audience-pandering. Pick one reader; write to them.' },
    { re: /\blet's dive in\b/i, rationale: 'Throat-clearing. Just start.' },
    { re: /\bin summary\b|\bin conclusion\b/i, rationale: 'Summarizing closer. End on the strongest sentence; trust the reader.' },
    { re: /\bmoreover\b|\bfurthermore\b/i, rationale: 'Transition crutch on a metronome. Drop, or use "also".' },
    { re: /\btapestry\b/i, rationale: 'AI scenery noun. Cut.' },
  ];
  let errors = 0;

  const checkLine = (line, rel, lineNum) => {
    for (const re of emDashPatterns) {
      if (re.test(line)) {
        console.error(`  ❌ ${rel}:${lineNum}: em dash → ${line.trim().slice(0, 120)}`);
        console.error(`        Use commas, colons, semicolons, periods, or parentheses.`);
        errors++;
        re.lastIndex = 0;
        break;
      }
      re.lastIndex = 0;
    }
    if (/ -- /.test(line)) {
      console.error(`  ❌ ${rel}:${lineNum}: \` -- \` em-dash substitute → ${line.trim().slice(0, 120)}`);
      console.error(`        Worse than the em dash. Pick real punctuation.`);
      errors++;
    }
    for (const rule of phraseRules) {
      if (rule.re.test(line)) {
        const matched = line.match(rule.re)?.[0] ?? '';
        console.error(`  ❌ ${rel}:${lineNum}: "${matched}" → ${line.trim().slice(0, 120)}`);
        console.error(`        ${rule.rationale}`);
        errors++;
      }
    }
  };

  const scan = (absPath, rel) => {
    const stat = fs.statSync(absPath);
    if (stat.isDirectory()) {
      for (const entry of fs.readdirSync(absPath)) {
        scan(path.join(absPath, entry), path.join(rel, entry));
      }
      return;
    }
    if (!extensions.has(path.extname(absPath))) return;
    const src = fs.readFileSync(absPath, 'utf-8');
    const lines = src.split('\n');
    lines.forEach((line, i) => checkLine(line, rel, i + 1));
  };

  for (const target of targets) {
    const full = path.join(rootDir, target);
    if (fs.existsSync(full)) scan(full, target);
  }

  if (errors === 0) {
    console.log(`✓ Prose validator: no AI tells in user-facing copy`);
  } else {
    console.error(`\n❌ ${errors} prose issue(s) in user-facing copy. See STYLE.md for the rules.`);
  }
  return errors;
}

/**
 * Narrow prose check for the impeccable skill source.
 *
 * The full validateProse rules don't fit LLM-facing reference instructions:
 * the hardening repetition and triadic checklists those files use exist on
 * purpose, and the structural-prose rules in STYLE.md require human judgment.
 * This validator only enforces the mechanical wins: em dashes (which are
 * pure punctuation laziness regardless of audience) and the small handful
 * of denylisted phrases that have no technical reading. Em-dash creep is the
 * only thing likely to come back at scale once humans stop watching.
 *
 * Returns the number of occurrences found. Build fails if > 0.
 */
function validateSkillProse(rootDir) {
  const target = 'skill';
  const extensions = new Set(['.md']);
  const emDashPatterns = [/—/g, /&mdash;/gi, /&#8212;/gi, /&#x2014;/gi];
  // Tighter than validateProse: only the rules that have no technical reading.
  // Skipping `data-driven` here would be a mistake (it slipped through twice
  // in live.md before this pass); but `seamless`, `robust`, etc. have
  // legitimate technical uses elsewhere we may want to allow.
  const phraseRules = [
    { re: /\bload-bearing\b/i, rationale: 'AI tell. Name what the thing actually does.' },
    { re: /\bhighest-leverage\b/i, rationale: 'AI tell. Say what specifically pays off.' },
    { re: /\bbiggest unlock\b/i, rationale: 'Marketing-speak. Describe the actual change.' },
    { re: /\breflex defaults?\b/i, rationale: 'Internal jargon. Say "instincts" or "first guesses".' },
    { re: /\bcollapses? into monoculture\b/i, rationale: 'Eval-speak. Describe what actually went wrong.' },
    { re: /\bdata-driven\b/i, rationale: 'Empty marketing adjective. Cite the data instead.' },
    { re: /\bdelves?\b|\bdelved\b|\bdelving\b/i, rationale: 'Top AI tell. Use "explore" or "look at".' },
    { re: /\btapestry\b/i, rationale: 'AI scenery noun. Cut.' },
    { re: /\bin today's\b/i, rationale: 'Throat-clearing opener. Start at the point.' },
    { re: /\bgone are the days\b/i, rationale: 'Throat-clearing. Make the point directly.' },
    { re: /\blet's dive in\b/i, rationale: 'Throat-clearing. Just start.' },
    { re: /\bin summary\b|\bin conclusion\b/i, rationale: 'Summarizing closer. End on the strongest sentence.' },
  ];
  let errors = 0;

  const checkLine = (line, rel, lineNum) => {
    for (const re of emDashPatterns) {
      if (re.test(line)) {
        console.error(`  ❌ ${rel}:${lineNum}: em dash → ${line.trim().slice(0, 120)}`);
        console.error(`        Use commas, colons, semicolons, periods, or parentheses.`);
        errors++;
        re.lastIndex = 0;
        break;
      }
      re.lastIndex = 0;
    }
    if (/ -- /.test(line)) {
      console.error(`  ❌ ${rel}:${lineNum}: \` -- \` em-dash substitute → ${line.trim().slice(0, 120)}`);
      console.error(`        Worse than the em dash. Pick real punctuation.`);
      errors++;
    }
    for (const rule of phraseRules) {
      if (rule.re.test(line)) {
        const matched = line.match(rule.re)?.[0] ?? '';
        console.error(`  ❌ ${rel}:${lineNum}: "${matched}" → ${line.trim().slice(0, 120)}`);
        console.error(`        ${rule.rationale}`);
        errors++;
      }
    }
  };

  const scan = (absPath, rel) => {
    const stat = fs.statSync(absPath);
    if (stat.isDirectory()) {
      for (const entry of fs.readdirSync(absPath)) {
        scan(path.join(absPath, entry), path.join(rel, entry));
      }
      return;
    }
    if (!extensions.has(path.extname(absPath))) return;
    const src = fs.readFileSync(absPath, 'utf-8');
    const lines = src.split('\n');
    lines.forEach((line, i) => checkLine(line, rel, i + 1));
  };

  const full = path.join(rootDir, target);
  if (fs.existsSync(full)) scan(full, target);

  if (errors === 0) {
    console.log(`✓ Skill prose validator: skill/ is clean`);
  } else {
    console.error(`\n❌ ${errors} prose issue(s) in skill/. See STYLE.md.`);
  }
  return errors;
}

/**
 * Validate that every hand-authored HTML page carries the shared site header.
 * The partial is stamped with `<!-- site-header v1 -->` so drift is loud.
 *
 * Returns the number of validation errors. Build fails if > 0.
 */
function validateSiteHeader(_rootDir) {
  // With Astro, the shared header is a component (site/components/Header.astro).
  // There's nothing to validate per-page — the component is imported by Base.astro
  // and rendered identically everywhere. This function is kept as a no-op so the
  // call site doesn't need to change.
  console.log('✓ Site header is a shared Astro component (no per-page validation needed)');
  return 0;
}

/**
 * Copy directory recursively
 */
function copyDirSync(src, dest) {
  fs.mkdirSync(dest, { recursive: true });
  const entries = fs.readdirSync(src, { withFileTypes: true });
  for (const entry of entries) {
    const srcPath = path.join(src, entry.name);
    const destPath = path.join(dest, entry.name);
    if (entry.isDirectory()) {
      copyDirSync(srcPath, destPath);
    } else {
      fs.copyFileSync(srcPath, destPath);
    }
  }
}

const __filename = fileURLToPath(import.meta.url);
const __dirname = path.dirname(__filename);
const ROOT_DIR = path.resolve(__dirname, '..');
const DIST_DIR = path.join(ROOT_DIR, 'dist');

// buildStaticSite (Bun HTML bundler) removed — now handled by Astro.

/**
 * Assemble universal directory from all provider outputs
 */
function assembleUniversal(distDir) {
  const universalDir = path.join(distDir, 'universal');

  // Clean and recreate
  if (fs.existsSync(universalDir)) {
    fs.rmSync(universalDir, { recursive: true, force: true });
  }

  const providerConfigs = Object.values(PROVIDERS);

  for (const { provider, configDir } of providerConfigs) {
    const src = path.join(distDir, provider, configDir);
    const dest = path.join(universalDir, configDir);
    if (fs.existsSync(src)) {
      copyDirSync(src, dest);
    }
  }

  // Add a visible README so macOS users don't see an empty folder
  // (all provider dirs are dotfiles, hidden by default in Finder)
  fs.writeFileSync(path.join(universalDir, 'README.txt'),
`Impeccable. Design fluency for AI harnesses.
https://impeccable.style

This folder contains skills for all supported tools:

  .cursor/    -> Cursor
  .claude/    -> Claude Code
  .gemini/    -> Gemini CLI
  .codex/     -> Codex custom agents (Codex skills use .agents/)
  .agents/    -> Codex CLI
  .github/    -> GitHub Copilot
  .kiro/      -> Kiro
  .opencode/  -> OpenCode
  .pi/        -> Pi
  .trae-cn/   -> Trae China
  .trae/      -> Trae International

To install, copy the relevant folder(s) into your project root.
For Codex, repo and user skill installs come from .agents/skills.
These are hidden folders (dotfiles). Press Cmd+Shift+. in Finder to see them.
`);

  console.log(`✓ Assembled universal directory (${providerConfigs.length} providers)`);
}

/**
 * Generate static API data for Cloudflare Pages deployment.
 * Pre-builds all API responses as JSON files so they can be served
 * as static assets via _redirects rewrites (no function invocations needed).
 */
function generateApiData(buildDir, skills, patterns) {
  const apiDir = path.join(buildDir, '_data', 'api');
  fs.mkdirSync(apiDir, { recursive: true });

  // skills.json
  const skillsData = skills.map(s => ({
    id: path.basename(path.dirname(s.filePath)),
    name: s.name,
    description: s.description,
    userInvocable: s.userInvocable,
  }));
  fs.writeFileSync(path.join(apiDir, 'skills.json'), JSON.stringify(skillsData));

  // commands.json - after v3.0 consolidation, commands are sub-commands of
  // /impeccable. Load them from command-metadata.json and include the root
  // impeccable skill itself so UI surfaces like the cheatsheet can list them.
  // Each entry also picks up a short `tagline` from its editorial file
  // (site/content/skills/<id>.md) when one exists. Taglines are used by UI
  // surfaces that need a human-friendly one-liner, while `description` stays
  // optimized for auto-trigger keyword matching in the AI harness.
  const readTagline = (id) => {
    const editorialPath = path.join(ROOT_DIR, 'site/content/skills', `${id}.md`);
    if (!fs.existsSync(editorialPath)) return null;
    const raw = fs.readFileSync(editorialPath, 'utf-8');
    const match = raw.match(/^---\n([\s\S]*?)\n---/);
    if (!match) return null;
    const taglineMatch = match[1].match(/tagline:\s*"([^"]+)"/);
    return taglineMatch ? taglineMatch[1] : null;
  };

  const metadataPath = path.join(ROOT_DIR, 'skill/scripts/command-metadata.json');
  if (!fs.existsSync(metadataPath)) {
    throw new Error(`command-metadata.json is missing at ${metadataPath}. This file is required to generate the commands API.`);
  }
  const impeccable = skills.find(s => s.name === 'impeccable');
  if (!impeccable) {
    throw new Error('impeccable skill not found at skill/SKILL.md. The build system expects exactly one skill at that path.');
  }

  const metadata = JSON.parse(fs.readFileSync(metadataPath, 'utf-8'));
  const commandsData = [
    {
      id: 'impeccable',
      name: 'impeccable',
      description: impeccable.description,
      tagline: readTagline('impeccable'),
      userInvocable: true,
    },
    ...Object.entries(metadata).map(([id, meta]) => ({
      id,
      name: id,
      description: meta.description,
      tagline: readTagline(id),
      userInvocable: true,
    })),
  ];
  fs.writeFileSync(path.join(apiDir, 'commands.json'), JSON.stringify(commandsData));

  // patterns.json
  fs.writeFileSync(path.join(apiDir, 'patterns.json'), JSON.stringify(patterns));

  // command-source/{id}.json (one per skill)
  const cmdSourceDir = path.join(apiDir, 'command-source');
  fs.mkdirSync(cmdSourceDir, { recursive: true });
  for (const skill of skills) {
    const id = path.basename(path.dirname(skill.filePath));
    const content = fs.readFileSync(skill.filePath, 'utf-8');
    fs.writeFileSync(
      path.join(cmdSourceDir, `${id}.json`),
      JSON.stringify({ content })
    );
  }

  const skillWord = skillsData.length === 1 ? 'skill' : 'skills';
  console.log(`✓ Generated static API data (${skillsData.length} ${skillWord}, ${commandsData.length} commands)`);
}

/**
 * Copy dist files to build output for Cloudflare Pages Functions access.
 * Download functions use env.ASSETS.fetch() to read these files.
 */
function copyDistToBuild(distDir, buildDir) {
  const destDir = path.join(buildDir, '_data', 'dist');
  copyDirSync(distDir, destDir);
  console.log('✓ Copied dist files to build output');
}

/**
 * Generate Cloudflare Pages config files (_headers, _redirects)
 */
function generateCFConfig(buildDir) {
  // _headers: security + cache headers
  const headers = `/*
  X-Content-Type-Options: nosniff
  X-Frame-Options: SAMEORIGIN

# HTML pages: browser always revalidates, CDN caches 1h
/*.html
  Cache-Control: public, max-age=0, s-maxage=3600, stale-while-revalidate=600

# Hashed JS/CSS bundles: immutable (filename changes on content change)
/assets/*.js
  Cache-Control: public, max-age=31536000, immutable

/assets/*.css
  Cache-Control: public, max-age=31536000, immutable

# Static images and logos: 1 week + 1 day stale
/assets/*.png
  Cache-Control: public, max-age=604800, stale-while-revalidate=86400

/assets/*.svg
  Cache-Control: public, max-age=604800, stale-while-revalidate=86400

/assets/*.webp
  Cache-Control: public, max-age=604800, stale-while-revalidate=86400

/antipattern-images/*
  Cache-Control: public, max-age=604800, stale-while-revalidate=86400

# Root static assets (favicon, og-image, etc.)
/favicon.svg
  Cache-Control: public, max-age=604800, stale-while-revalidate=86400

/og-image.jpg
  Cache-Control: public, max-age=604800, stale-while-revalidate=86400

/apple-touch-icon.png
  Cache-Control: public, max-age=604800, stale-while-revalidate=86400

# ZIP downloads: 1h cache
/dist/*.zip
  Cache-Control: public, max-age=3600, stale-while-revalidate=600

# API routes: CDN caches 24h
/api/*
  Cache-Control: public, s-maxage=86400, stale-while-revalidate=3600

/_data/api/*
  Cache-Control: public, s-maxage=86400, stale-while-revalidate=3600
`;
  fs.writeFileSync(path.join(buildDir, '_headers'), headers);

  // _redirects: rewrite JSON API routes to static files (200 = rewrite, not redirect).
  // Plus permanent redirects for legacy URLs.
  const redirects = `/api/skills /_data/api/skills.json 200
/api/commands /_data/api/commands.json 200
/api/patterns /_data/api/patterns.json 200
/api/command-source/:id /_data/api/command-source/:id.json 200
/gallery /slop#try-it-live 301
/cheatsheet /docs 301
/skills /docs 301
/skills/:id /docs/:id 301
/anti-patterns /slop#catalog 301
/visual-mode /slop#see-it 301
/neon-mirai /neo-mirai/ 301
/neon-mirai/ /neo-mirai/ 301
/cases/neon-mirai /cases/neo-mirai 301
/cases/neon-mirai/ /cases/neo-mirai 301
`;
  fs.writeFileSync(path.join(buildDir, '_redirects'), redirects);

  // _routes.json: tell Cloudflare Pages which paths invoke Functions
  // Without this, the SPA fallback serves index.html for function routes
  const routes = {
    version: 1,
    include: ['/api/download/*'],
    exclude: [],
  };
  fs.writeFileSync(path.join(buildDir, '_routes.json'), JSON.stringify(routes, null, 2));

  console.log('✓ Generated Cloudflare Pages config (_headers, _redirects, _routes.json)');
}

/**
 * Main build process
 */
async function build() {
  console.log('🔨 Building cross-provider design skills...\n');

  // Sub-page generation, HTML bundling, and static-asset copying are now
  // handled by Astro (bun run build:site). This script focuses on skills,
  // API data, and Cloudflare config.

  // Copy browser detector to site/public/js/ so the antipattern examples can
  // reference it (Astro serves site/public/ as-is).
  const detectorSrc = path.join(ROOT_DIR, 'cli', 'engine', 'detect-antipatterns-browser.js');
  if (fs.existsSync(detectorSrc)) {
    const jsDir = path.join(ROOT_DIR, 'site', 'public', 'js');
    fs.mkdirSync(jsDir, { recursive: true });
    fs.copyFileSync(detectorSrc, path.join(jsDir, 'detect-antipatterns-browser.js'));
  }

  const buildDir = path.join(ROOT_DIR, 'build');

  // Read source files (unified skills architecture)
  const { skills } = readSourceFiles(ROOT_DIR);
  const patterns = readPatterns(ROOT_DIR);
  const userInvocableCount = skills.filter(s => s.userInvocable).length;
  console.log(`📖 Read ${skills.length} skills (${userInvocableCount} user-invocable) and ${patterns.patterns.length + patterns.antipatterns.length} pattern categories\n`);

  const frontmatterErrors = validateSkillFrontmatter(skills);
  if (frontmatterErrors > 0) {
    process.exit(1);
  }

  // Read skills version from plugin.json
  const pluginJson = JSON.parse(fs.readFileSync(path.join(ROOT_DIR, '.claude-plugin/plugin.json'), 'utf-8'));
  const skillsVersion = pluginJson.version;

  // Transform for each provider
  for (const config of Object.values(PROVIDERS)) {
    const transform = createTransformer(config);
    transform(skills, DIST_DIR, { skillsVersion });
  }

  // Assemble universal directory
  assembleUniversal(DIST_DIR);

  // Create ZIP bundles (individual + universal)
  await createAllZips(DIST_DIR);

  // Generate static API data and Cloudflare Pages config
  // Write API data and CF config to site/public/ so Astro copies them to build/.
  // Astro wipes build/ before writing, so anything written directly to build/
  // during build:skills would be destroyed when build:site runs.
  const publicDir = path.join(ROOT_DIR, 'site', 'public');
  generateApiData(publicDir, skills, patterns);
  generateCFConfig(publicDir);

  // Copy all provider outputs to project root for local testing.
  // `.codex/` is intentionally excluded: Codex no longer consumes that layout; keep
  // generated bundles under dist/ only.
  const syncConfigs = Object.values(PROVIDERS).filter(({ configDir }) => configDir !== '.codex');

  for (const { provider, configDir } of syncConfigs) {
    const skillsSrc = path.join(DIST_DIR, provider, configDir, 'skills');
    const skillsDest = path.join(ROOT_DIR, configDir, 'skills');

    if (fs.existsSync(skillsSrc)) {
      // Preserve legacy per-project script artifacts (e.g. live-mode config.json)
      // across the rm + recopy. The build intentionally doesn't ship them,
      // so without this the sync destroys local state on every rebuild.
      const stashed = stashPerProjectArtifacts(skillsDest);
      if (fs.existsSync(skillsDest)) fs.rmSync(skillsDest, { recursive: true });
      copyDirSync(skillsSrc, skillsDest);
      restorePerProjectArtifacts(skillsDest, stashed);
    }
  }

  for (const { provider, configDir, agentFormat } of Object.values(PROVIDERS)) {
    if (!agentFormat) continue;

    const agentsSrc = path.join(DIST_DIR, provider, configDir, 'agents');
    const agentsDest = path.join(ROOT_DIR, configDir, 'agents');

    if (fs.existsSync(agentsDest)) fs.rmSync(agentsDest, { recursive: true, force: true });
    if (fs.existsSync(agentsSrc)) {
      copyDirSync(agentsSrc, agentsDest);
    }
  }

  // Remove deprecated skill stubs from local harness dirs. They exist
  // in dist/ so the cleanup script can redirect users, but they should
  // not clutter the repo's own skill directories.
  const deprecatedLocalSkills = [
    'frontend-design', 'teach-impeccable',
    'arrange', 'normalize', 'onboard', 'extract',
    // v3.0 consolidation: standalone skills -> /impeccable sub-commands
    'adapt', 'animate', 'audit', 'bolder', 'clarify', 'colorize',
    'critique', 'delight', 'distill', 'harden', 'layout', 'optimize',
    'overdrive', 'polish', 'quieter', 'shape', 'typeset',
  ];
  for (const { configDir } of syncConfigs) {
    for (const name of deprecatedLocalSkills) {
      const p = path.join(ROOT_DIR, configDir, 'skills', name);
      if (fs.existsSync(p)) fs.rmSync(p, { recursive: true, force: true });
    }
  }

  console.log(`📋 Synced skills to: ${syncConfigs.map(p => p.configDir).join(', ')}`);

  // Build the Claude Code plugin subtree at ./plugin/.
  // The Claude Code marketplace is configured with `source: "./plugin"`, so
  // the plugin cache only copies this slim directory (~0.3 MB) instead of
  // the entire monorepo (~291 MB on the previous "./" source). The harness
  // dirs above stay where they are because `npx skills add pbakaus/impeccable`
  // reads them directly from the GitHub repo at install time.
  const pluginRoot = path.join(ROOT_DIR, 'plugin');
  const pluginManifestDir = path.join(pluginRoot, '.claude-plugin');
  const pluginSkillsDir = path.join(pluginRoot, 'skills');
  const pluginAgentsDir = path.join(pluginRoot, 'agents');
  if (fs.existsSync(pluginManifestDir)) fs.rmSync(pluginManifestDir, { recursive: true });
  if (fs.existsSync(pluginSkillsDir)) fs.rmSync(pluginSkillsDir, { recursive: true });
  if (fs.existsSync(pluginAgentsDir)) fs.rmSync(pluginAgentsDir, { recursive: true });

  const rootManifest = JSON.parse(fs.readFileSync(path.join(ROOT_DIR, '.claude-plugin/plugin.json'), 'utf-8'));
  const claudeAgentsSrc = path.join(DIST_DIR, 'claude-code', '.claude', 'agents');
  const pluginAgentEntries = fs.existsSync(claudeAgentsSrc)
    ? fs.readdirSync(claudeAgentsSrc)
        .filter(file => file.endsWith('.md'))
        .sort()
        .map(file => `./agents/${file}`)
    : [];
  // Trailing slash on the skills path matches the documented schema in
  // code.claude.com/docs/en/plugins-reference. Issue #86 has 3 reporters
  // converging on "add trailing slash to fix slash commands not registering";
  // the docs schema example consistently uses `"./custom/skills/"` form.
  const pluginManifest = { ...rootManifest, skills: './skills/' };
  if (pluginAgentEntries.length) {
    pluginManifest.agents = pluginAgentEntries;
  } else {
    delete pluginManifest.agents;
  }
  fs.mkdirSync(pluginManifestDir, { recursive: true });
  fs.writeFileSync(
    path.join(pluginManifestDir, 'plugin.json'),
    JSON.stringify(pluginManifest, null, 2) + '\n',
  );

  const claudeSkillsSrc = path.join(DIST_DIR, 'claude-code', '.claude', 'skills', 'impeccable');
  if (fs.existsSync(claudeSkillsSrc)) {
    fs.mkdirSync(pluginSkillsDir, { recursive: true });
    copyDirSync(claudeSkillsSrc, path.join(pluginSkillsDir, 'impeccable'));
  }

  if (fs.existsSync(claudeAgentsSrc)) {
    copyDirSync(claudeAgentsSrc, pluginAgentsDir);
  }

  console.log('📦 Built Claude Code plugin subtree at ./plugin/');

  // Generate authoritative counts and validate references
  const countErrors = generateCounts(ROOT_DIR, skills, buildDir);

  // Verify every hand-authored HTML page carries the shared site header
  const headerErrors = validateSiteHeader(ROOT_DIR);

  // Scan user-facing copy for AI tells (em dashes, marketing fluff, denylisted phrases)
  const proseErrors = validateProse(ROOT_DIR);

  // Narrow scan of LLM-facing skill instructions: em dashes + a tighter denylist
  // that has no technical reading. Hardening repetition is intentionally allowed.
  const skillProseErrors = validateSkillProse(ROOT_DIR);

  if (countErrors > 0 || headerErrors > 0 || proseErrors > 0 || skillProseErrors > 0) {
    process.exit(1);
  }

  console.log('\n✨ Build complete!');
}

// Run the build
build();