// safelist-loader.js
const fs = require('fs');
const path = require('path');
const yaml = require('js-yaml');

/**
 * Generate a Tailwind CSS safelist array from a YAML file.
 * @param {string} yamlFilePath - Path to the YAML file, relative to the working directory.
 * @returns {string[]} Array of unique class names.
 */
function generateSafelist(yamlFilePath) {
  // Resolve the YAML file path
  const absolutePath = path.resolve(process.cwd(), yamlFilePath);
  const content = fs.readFileSync(absolutePath, 'utf8');
  const doc = yaml.load(content);

  const classes = new Set();

  function walk(obj) {
    if (Array.isArray(obj)) {
      obj.forEach(walk);
    } else if (obj && typeof obj === 'object') {
      // Expand gridColumnClassAutoConfiguration placeholders
      if (obj.gridColumnClassAutoConfiguration) {
        const { gridSize, viewPorts } = obj.gridColumnClassAutoConfiguration;
        const placeholder = /\{\@[\w]+\}/g;
        if (typeof gridSize === 'number' && viewPorts) {
          Object.values(viewPorts).forEach(vp => {
            if (typeof vp.classPattern === 'string') {
              for (let i = 1; i <= gridSize; i++) {
                classes.add(vp.classPattern.replace(placeholder, i));
              }
            }
          });
        }
      }

      // Collect any *ClassAttribute strings
      Object.entries(obj).forEach(([key, val]) => {
        if (/Class(Attribute)?$/.test(key) && typeof val === 'string') {
          val.split(/\s+/).forEach(c => {
            if (c) classes.add(c);
          });
        } else {
          walk(val);
        }
      });
    }
  }

  walk(doc);
  return Array.from(classes);
}

module.exports = generateSafelist;

// Usage in tailwind.config.js:
// const safelistLoader = require('./safelist-loader');
// module.exports = {
//   // ... other config ...
//   safelist: generateSafelist('packages/base/Configuration/Ext/Form/Yaml/Setup.yaml'),
// };