const fs = require('fs');
const path = require('path');
const { parseTemplateSchema } = require('./templateSchema');

const BACKEND_ROOT = path.join(__dirname, '..', '..');

function isLocalMicrositeV2TemplatesEnabled() {
  const v = String(process.env.MICROSITE_V2_READ_FROM_LOCAL || '').trim().toLowerCase();
  return v === '1' || v === 'true' || v === 'yes';
}

function getTemplatesRoot() {
  const custom = String(process.env.MICROSITE_V2_TEMPLATES_DIR || '').trim();
  if (custom) return path.resolve(custom);
  return path.join(BACKEND_ROOT, 'microsite-v2-templates');
}

function resolveTemplateDir(slug) {
  const normalized = String(slug || '').trim().toLowerCase();
  if (!normalized) return null;
  const dir = path.join(getTemplatesRoot(), normalized);
  if (!fs.existsSync(dir)) return null;
  return dir;
}

function readLocalTemplateSchema(slug) {
  const dir = resolveTemplateDir(slug);
  if (!dir) return null;
  const jsonPath = path.join(dir, 'template.json');
  if (!fs.existsSync(jsonPath)) return null;
  return parseTemplateSchema(fs.readFileSync(jsonPath));
}

function readLocalTemplateHtml(slug) {
  const dir = resolveTemplateDir(slug);
  if (!dir) return null;
  const htmlPath = path.join(dir, 'template.html');
  if (!fs.existsSync(htmlPath)) return null;
  return fs.readFileSync(htmlPath, 'utf8');
}

module.exports = {
  isLocalMicrositeV2TemplatesEnabled,
  getTemplatesRoot,
  readLocalTemplateSchema,
  readLocalTemplateHtml,
};