require("dotenv").config();
const fs = require("fs").promises;
const path = require("path");
const connectDB = require("../config/database");
const AboutUs = require("../models/aboutUs");

/**
 * Normalize the provided aboutUs.json into the AboutUs model shape.
 */
function transformAboutUs(source) {
  const hero = {
    banner: source?.hero?.banner || "",
    title: source?.hero?.title || "",
    breadcrumb: source?.hero?.breadcrumb || "",
  };

  // Introduce section
  const introduce = {
    header: source?.introduce?.header || {},
    services: Array.isArray(source?.introduce?.services)
      ? source.introduce.services
      : [],
  };

  // Stats
  const stats = Array.isArray(source?.stats) ? source.stats : [];

  // Features: header + items
  const features = {
    header: source?.features?.header || {},
    items: Array.isArray(source?.features?.items) ? source.features.items : [],
  };

  // Activities
  const activities = source?.activities || {};

  // Newsletter
  const newsletter = source?.newsletter || {};

  // Events: header + items
  const events = {
    header: source?.events?.header || {},
    items: Array.isArray(source?.events?.items) ? source.events.items : [],
  };

  return {
    hero,
    introduce,
    stats,
    features,
    activities,
    newsletter,
    events,
    updatedAt: new Date(),
  };
}

/**
 * Migration: aboutus
 */
async function migrate() {
  try {
    await connectDB();

    const filePath = path.join(__dirname, "..", "data", "aboutUs.json");
    const raw = await fs.readFile(filePath, "utf8");
    const source = JSON.parse(raw);

    const doc = transformAboutUs(source);

    await AboutUs.create(doc);

    const mongoose = require('mongoose');
    await mongoose.disconnect();
    process.exit(0);
  } catch (error) {
    console.error('Migration error:', error);
    process.exit(1);
  }
}

// Chạy migration nếu được gọi trực tiếp
if (require.main === module) {
  migrate();
}

module.exports = { migrate };