#!/usr/bin/env node
/**
 * Token validation script — checks for hardcoded colors in source files
 * and reports token coverage per product.
 *
 * Usage: node scripts/validate-tokens.js [product-path]
 */

const { readFileSync, readdirSync, statSync } = require('fs');
const { join, resolve } = require('path');

const HARD_COLOR_REGEX = /#[0-9A-Fa-f]{3,8}\b|rgb\([^)]+\)|rgba\([^)]+\)|hsl\([^)]+\)/g;
const EXCLUDED_DIRS = ['node_modules', 'dist', 'build', '.git', 'generated', '__mocks__'];
const INCLUDED_EXTENSIONS = ['.ts', '.tsx', '.js', '.jsx', '.swift', '.kt'];

function findFiles(dir, files = []) {
  try {
    const items = readdirSync(dir);
    for (const item of items) {
      const fullPath = join(dir, item);
      if (EXCLUDED_DIRS.some(ex => fullPath.includes(ex))) continue;

      const stat = statSync(fullPath);
      if (stat.isDirectory()) {
        findFiles(fullPath, files);
      } else if (INCLUDED_EXTENSIONS.some(ext => item.endsWith(ext))) {
        files.push(fullPath);
      }
    }
  } catch {
    // Directory might not exist or be accessible
  }
  return files;
}

function analyzeFile(filePath) {
  const content = readFileSync(filePath, 'utf-8');
  const lines = content.split('\n');
  const issues = [];

  lines.forEach((line, index) => {
    // Skip comments
    if (line.trim().startsWith('//') || line.trim().startsWith('*') || line.trim().startsWith('/*'))
      return;

    const matches = line.match(HARD_COLOR_REGEX);
    if (matches) {
      // Filter out legitimate uses (like transparency values)
      const suspicious = matches.filter(m => {
        if (m.startsWith('#') && (m.length === 9 || m.length === 5)) return false; // Skip alpha hex
        if (m.includes('0.0') || m.includes('1.0')) return false; // Skip clear/opaque
        // Skip CSS-variable token usage (already tokenized)
        if ((m.startsWith('hsl(') || m.startsWith('rgb(') || m.startsWith('rgba(')) && m.includes('var(--'))
          return false;
        return true;
      });

      if (suspicious.length > 0) {
        issues.push({
          line: index + 1,
          colors: suspicious,
          content: line.trim().slice(0, 80),
        });
      }
    }
  });

  return issues;
}

function main() {
  const targetPath = process.argv[2] || '.';
  const absolutePath = resolve(targetPath);

  console.log(`🔍 Scanning ${absolutePath} for hardcoded colors...\n`);

  const files = findFiles(absolutePath);
  let totalIssues = 0;
  let filesWithIssues = 0;

  for (const file of files) {
    const issues = analyzeFile(file);
    if (issues.length > 0) {
      filesWithIssues++;
      totalIssues += issues.length;
      const relativePath = file.replace(absolutePath, '').slice(1);
      console.log(`\n📄 ${relativePath}`);
      issues.forEach(issue => {
        console.log(`   Line ${issue.line}: ${issue.colors.join(', ')}`);
        console.log(`   ${issue.content}`);
      });
    }
  }

  console.log(`\n${'='.repeat(60)}`);
  console.log(`📊 Summary:`);
  console.log(`   Files scanned: ${files.length}`);
  console.log(`   Files with hardcoded colors: ${filesWithIssues}`);
  console.log(`   Total hardcoded colors found: ${totalIssues}`);

  if (totalIssues > 0) {
    console.log(`\n⚠️  Consider replacing hardcoded colors with design tokens:`);
    console.log(`   Web:    var(--ml-<token>) from @bytelyst/design-tokens`);
    console.log(`   iOS:    MindLystColors.dark<Token> / MindLystColors.light<Token>`);
    console.log(`   KMP:    MindLystTokens.Dark.<TOKEN> / MindLystTokens.Light.<TOKEN>`);
    process.exit(1);
  } else {
    console.log(`\n✅ No hardcoded colors found! All colors use design tokens.`);
    process.exit(0);
  }
}

main();