const { addBaseUrlToImages } = require("../utils/imageHelper");
const AboutUs = require("../models/aboutUs");
const jsonHelper = require("../utils/jsonHelper");

/**
 * GET /api/about
 * Lấy dữ liệu About Us (Public API cho website và CMS load dữ liệu)
 */
exports.getAbout = async (req, res) => {
    try {
        // Force no-cache headers
        res.setHeader('Cache-Control', 'no-cache, no-store, must-revalidate');
        res.setHeader('Pragma', 'no-cache');
        res.setHeader('Expires', '0');

        const data = await AboutUs.getSingle();
        const rawData = data.toObject();

        const baseUrl = process.env.BACKEND_URL || `${req.protocol}://${req.get('host')}`;
        const processedData = addBaseUrlToImages(rawData, baseUrl);
        
        res.json(processedData);
    } catch (error) {
        console.error("Error getting about data:", error);
        res.status(500).json({
            success: false,
            error: "Failed to get about data"
        });
    }
};

/**
 * PUT /api/about
 * Cập nhật dữ liệu About Us (Dùng cho AJAX từ CMS)
 */
exports.updateAbout = async (req, res) => {
    try {
        let updateData = req.body;

        // Nếu dữ liệu gửi qua trường aboutJson (dạng string JSON)
        if (updateData.aboutJson && typeof updateData.aboutJson === "string") {
            try {
                updateData = JSON.parse(updateData.aboutJson);
            } catch (e) {
                return res.status(400).json({
                    success: false,
                    message: "Invalid JSON in aboutJson"
                });
            }
        }

        const doc = await AboutUs.getSingle();
        // Use .set() for better handling of nested objects/arrays in Mongoose
        doc.set(updateData);
        await doc.save();

        // Fetch fresh data for syncing and returning
        const finalData = await AboutUs.findOne()
            .select('-_id -__v -createdAt -updatedAt')
            .lean();

        // Update about.json file to keep it in sync
        jsonHelper.writeJsonFile("about", finalData);

        res.json({
            success: true,
            message: "About Us updated successfully",
            data: finalData
        });
    } catch (error) {
        console.error("Error updating about data:", error);
        res.status(500).json({
            success: false,
            error: "Failed to update about data: " + error.message
        });
    }
};

/**
 * Render admin page (Dùng cho Admin UI)
 */
exports.index = async (req, res) => {
    try {
        const data = await AboutUs.getSingle();
        const rawData = data.toObject();

        const activeTab = req.query.activeTab || "hero";
        res.render("admin/aboutUs/index", {
            layout: "layouts/main",
            title: "About Us Management",
            data: rawData,
            activeTab,
            user: req.session.user,
            currentPath: req.path,
            frontendUrl: process.env.FRONTEND_URL || 'http://localhost:3000'
        });
    } catch (err) {
        console.error("Error in about index:", err);
        req.flash("error_msg", "Error loading About Us page");
        res.redirect("/admin/dashboard");
    }
};

/**
 * Update method cho form-based submission (Admin UI - Post fallback)
 */
exports.update = async (req, res) => {
    try {
        let updateData = req.body;
        if (updateData.aboutJson && typeof updateData.aboutJson === "string") {
            try {
                updateData = JSON.parse(updateData.aboutJson);
            } catch (e) {
                req.flash("error_msg", "Invalid JSON data");
                return res.redirect("/admin/about-us");
            }
        }

        const doc = await AboutUs.getSingle();
        doc.set(updateData);
        await doc.save();

        const finalData = await AboutUs.findOne()
            .select('-_id -__v -createdAt -updatedAt')
            .lean();
        jsonHelper.writeJsonFile("about", finalData);

        req.flash("success_msg", "About Us updated successfully");
        const activeTab = req.query.activeTab || "hero";
        res.redirect(`/admin/about-us?activeTab=${activeTab}`);
    } catch (err) {
        console.error("Update error:", err);
        req.flash("error_msg", "Error updating About Us: " + err.message);
        res.redirect("/admin/about-us");
    }
};

// Aliases for compatibility
exports.api = exports.getAbout;
exports.page = exports.getAbout;
exports.updateAboutUs = exports.updateAbout;