const Home = require("../models/home");
const { addBaseUrlToImages } = require("../utils/imageHelper");

// Helpers
const getHomeDoc = async () => Home.findOne().sort({ updatedAt: -1 });
const getHomeData = async () => (await getHomeDoc())?.toObject() || {};

const getDefaultHomeData = () => ({
  hero: {
    badge: "",
    title: "",
    description: "",
    searchPlaceholder: "",
    buttonLabel: "",
    image: "",
    imageAlt: "",
    floatingBadge: {
      icon: "",
      value: "",
      label: "",
    },
  },
  quickLinks: [],
  valueProp: {
    badge: "",
    title: "",
    description: "",
    features: [],
    stats: [],
  },
  programs: {
    heading: "",
    description: "",
    items: [],
  },
  requestInfo: {
    heading: "",
    description: "",
    phone: "",
    email: "",
    programs: [],
  },
});

// Admin: render management view with data from MongoDB
exports.index = async (req, res) => {
  try {
    let data = await getHomeData();
    const defaults = getDefaultHomeData();

    // Merge defaults for any missing sections
    const sections = Object.keys(defaults);
    sections.forEach((s) => {
      data[s] = data[s] || defaults[s];
    });

    const frontendUrl = process.env.FRONTEND_URL || "";

    return res.render("admin/home/index", {
      layout: "layouts/main",
      title: "Home Management",
      data,
      frontendUrl,
      currentPath: req.path,
      user: req.session.user,
    });
  } catch (err) {
    console.error("Home index error:", err);
    req.flash("error_msg", "Error loading home data");
    return req.session.save(() => res.redirect("/admin/dashboard"));
  }
};

// Admin: parse req.body sections and save to MongoDB
exports.update = async (req, res) => {
  try {
    const sections = [
      "hero",
      "quickLinks",
      "valueProp",
      "programs",
      "requestInfo",
    ];

    let doc = await getHomeDoc();

    if (!doc) {
      doc = new Home({});
    }

    let hasChanges = false;

    for (const section of sections) {
      if (req.body[section]) {
        try {
          const payload = JSON.parse(req.body[section]);
          doc[section] = payload;
          doc.markModified(section);
          hasChanges = true;
        } catch (e) {
          console.error(`Invalid JSON for ${section}:`, e.message);
        }
      }
    }

    if (!hasChanges) {
      req.flash("info_msg", "No changes were made");
      return req.session.save(() => res.redirect("/admin/home"));
    }

    await doc.save();

    req.flash("success_msg", "Home page configuration has been updated!");
    return req.session.save(() => res.redirect("/admin/home"));
  } catch (err) {
    console.error("Home update error:", err);
    req.flash("error_msg", `Update error: ${err.message}`);
    return req.session.save(() => res.redirect("/admin/home"));
  }
};

// Public API: return JSON data for frontend
exports.api = async (req, res) => {
  try {
    let data = await getHomeData();
    if (!data || Object.keys(data).length === 0) {
      data = getDefaultHomeData();
    }
    const baseUrl = process.env.BACKEND_URL || `${req.protocol}://${req.get("host")}`;
    return res.json(addBaseUrlToImages(data, baseUrl));
  } catch (err) {
    console.error("Home API error:", err);
    return res.status(500).json({ error: "Error loading home data" });
  }
};