// controllers/visaController.js

const addBaseUrlToImages = (data, baseUrl) => {
  if (!data) return data;

  // Nếu là mảng, duyệt từng phần tử
  if (Array.isArray(data)) {
    return data.map((item) => addBaseUrlToImages(item, baseUrl));
  }

  // Nếu là object, duyệt từng key
  if (typeof data === "object") {
    const newObj = {};
    for (const [key, value] of Object.entries(data)) {
      // Kiểm tra nếu key là các trường chứa ảnh và value là string
      const imageKeys = ["icon", "mainImage", "bannerImage", "image"];

      if (
        imageKeys.includes(key) &&
        typeof value === "string" &&
        !value.startsWith("http")
      ) {
        newObj[key] = `${baseUrl}/${value}`
          .replace(/\/+/g, "/")
          .replace(":/", "://");
      }
      // Xử lý riêng cho mảng gallery (mảng các chuỗi)
      else if (key === "gallery" && Array.isArray(value)) {
        newObj[key] = value.map((img) =>
          img.startsWith("http")
            ? img
            : `${baseUrl}/${img}`.replace(/\/+/g, "/").replace(":/", "://"),
        );
      }
      // Nếu là object hoặc mảng con khác, đệ quy tiếp
      else if (typeof value === "object" && value !== null) {
        newObj[key] = addBaseUrlToImages(value, baseUrl);
      } else {
        newObj[key] = value;
      }
    }
    return newObj;
  }
  return data;
};
const Visa = require("../models/visa");

// -------------------- Helper Functions --------------------

// Get visa data from MongoDB
const getVisaData = async () => {
  const visa = await Visa.findOne().sort({ updatedAt: -1 }).lean();
  return visa || {};
};

// Get default visa data structure (updated to match new JSON)
const getDefaultVisaData = () => ({
  hero: {
    title: "Visa Service",
    summaryList: [],
  },
});

// Helper function: Generate next country ID
const getNextCountryId = (countries) => {
  if (!Array.isArray(countries) || countries.length === 0) return 1;
  return Math.max(...countries.map((c) => c.id || 0)) + 1;
};

// -------------------- Admin Exports --------------------

// Display visa management page
exports.index = async (req, res) => {
  try {
    // Fetch Visa data
    let data = await getVisaData();

    // If no data exists, use default
    if (!data || Object.keys(data).length === 0) {
      data = getDefaultVisaData();
    } else {
      // Merge with defaults to ensure all fields exist
      const defaultData = getDefaultVisaData();

      // Ensure hero section exists with defaults
      data.hero = data.hero || defaultData.hero;
      data.hero.title = data.hero.title || "Visa Service";
      data.hero.summaryList = data.hero.summaryList || [];
    }

    const frontendUrl = process.env.FRONTEND_URL || "http://localhost:3000";

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

// Get single country for edit
exports.getCountry = async (req, res) => {
  try {
    const { slug } = req.params;
    const visaData = await getVisaData();

    if (!visaData.hero || !visaData.hero.summaryList) {
      return res.status(404).json({ error: "Visa data not found" });
    }

    const country = visaData.hero.summaryList.find((c) => c.slug === slug);

    if (!country) {
      return res.status(404).json({ error: `Country "${slug}" not found` });
    }

    res.json(country);
  } catch (err) {
    console.error("Get country error:", err);
    res.status(500).json({ error: "Error loading country" });
  }
};

// Update visa data (hero title only)
exports.update = async (req, res) => {
  try {
    // Get current data
    const currentData = await getVisaData();

    // Create updated data object
    const updatedData = {
      ...(currentData.toObject ? currentData.toObject() : currentData),
    };

    // Ensure hero structure exists
    updatedData.hero = updatedData.hero || {
      title: "Visa Service",
      summaryList: [],
    };

    // Update hero title
    if (req.body.heroTitle) {
      updatedData.hero.title = req.body.heroTitle;
    }

    // Check if there are changes
    const hasChanges =
      JSON.stringify(updatedData) !== JSON.stringify(currentData);

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

    // Update or create document
    try {
      if (currentData._id) {
        await Visa.findByIdAndUpdate(currentData._id, updatedData, {
          new: true,
        });
      } else {
        await Visa.create(updatedData);
      }

      req.flash("success_msg", "Visa data updated successfully");
      return req.session.save(() => res.redirect("/admin/visa"));
    } catch (dbError) {
      console.error("Database error:", dbError);
      req.flash("error_msg", `Database error: ${dbError.message || "Unknown"}`);
      return req.session.save(() => res.redirect("/admin/visa"));
    }
  } catch (err) {
    console.error("Update error:", err);
    req.flash("error_msg", `Update error: ${err.message || "Unknown"}`);
    return req.session.save(() => res.redirect("/admin/visa"));
  }
};

// Add new country
exports.addCountry = async (req, res) => {
  try {
    let visaData = await getVisaData();

    // Initialize hero structure if not exist
    if (!visaData.hero || !visaData.hero.summaryList) {
      visaData = getDefaultVisaData();
    }

    // Validate required fields
    if (!req.body.name || !req.body.slug) {
      return res.status(400).json({ error: "Name and slug are required" });
    }

    // Check if slug already exists
    const slugExists = visaData.hero.summaryList.some(
      (c) => c.slug === req.body.slug,
    );
    if (slugExists) {
      return res
        .status(400)
        .json({ error: `Slug "${req.body.slug}" already exists` });
    }

    // Parse services array
    let services = [];
    if (req.body.services) {
      if (typeof req.body.services === "string") {
        try {
          services = JSON.parse(req.body.services);
        } catch (e) {
          services = [req.body.services];
        }
      } else if (Array.isArray(req.body.services)) {
        services = req.body.services;
      }
    }

    // Parse detailedView if provided (optional)
    let detailedView = null;
    if (req.body.detailedView) {
      try {
        detailedView =
          typeof req.body.detailedView === "string"
            ? JSON.parse(req.body.detailedView)
            : req.body.detailedView;
      } catch (e) {
        console.warn("Could not parse detailedView, creating without it");
      }
    }

    // Create new country object
    const newCountry = {
      id: req.body.id || getNextCountryId(visaData.hero.summaryList),
      name: req.body.name,
      slug: req.body.slug,
      icon: req.body.icon || "",
      services: services,
      ...(detailedView && { detailedView }),
    };

    // Add new country to summaryList
    visaData.hero.summaryList.push(newCountry);

    // Update database
    const updatedData = {
      ...(visaData.toObject ? visaData.toObject() : visaData),
    };

    let savedData;
    if (visaData._id) {
      savedData = await Visa.findByIdAndUpdate(visaData._id, updatedData, {
        new: true,
      });
    } else {
      savedData = await Visa.create(updatedData);
    }

    console.log(`✅ Country "${newCountry.name}" added successfully`);
    res.json({
      success: true,
      message: `Country "${newCountry.name}" added successfully`,
      country: newCountry,
    });
  } catch (err) {
    console.error("Add country error:", err);
    res.status(500).json({ error: err.message });
  }
};

// Update single country
exports.updateCountry = async (req, res) => {
  try {
    const { slug } = req.params;
    let visaData = await getVisaData();

    if (!visaData.hero || !visaData.hero.summaryList) {
      return res.status(400).json({ error: "Invalid visa data structure" });
    }

    const countryIndex = visaData.hero.summaryList.findIndex(
      (c) => c.slug === slug,
    );

    if (countryIndex === -1) {
      return res.status(404).json({ error: `Country "${slug}" not found` });
    }

    const currentCountry = visaData.hero.summaryList[countryIndex];

    // Parse services array
    let services = currentCountry.services || [];
    if (req.body.services) {
      if (typeof req.body.services === "string") {
        try {
          services = JSON.parse(req.body.services);
        } catch (e) {
          services = [req.body.services];
        }
      } else if (Array.isArray(req.body.services)) {
        services = req.body.services;
      }
    }

    // Parse detailedView if provided (optional)
    let detailedView = currentCountry.detailedView;
    if (req.body.detailedView) {
      try {
        detailedView =
          typeof req.body.detailedView === "string"
            ? JSON.parse(req.body.detailedView)
            : req.body.detailedView;
      } catch (e) {
        console.warn("Could not parse detailedView");
      }
    }

    // Update country data
    const updatedCountry = {
      ...currentCountry,
      name: req.body.name || currentCountry.name,
      slug: req.body.slug || currentCountry.slug, // Allow slug update
      icon: req.body.icon || currentCountry.icon,
      services: services,
      ...(detailedView && { detailedView }),
    };

    visaData.hero.summaryList[countryIndex] = updatedCountry;

    // Update database
    const updatedData = {
      ...(visaData.toObject ? visaData.toObject() : visaData),
    };

    if (visaData._id) {
      await Visa.findByIdAndUpdate(visaData._id, updatedData, { new: true });
    } else {
      await Visa.create(updatedData);
    }

    console.log(`✅ Country "${updatedCountry.name}" updated successfully`);
    res.json({
      success: true,
      message: `Country "${updatedCountry.name}" updated successfully`,
      country: updatedCountry,
    });
  } catch (err) {
    console.error("Update country error:", err);
    res.status(500).json({ error: err.message });
  }
};

// Delete country
exports.deleteCountry = async (req, res) => {
  try {
    const { slug } = req.params;
    let visaData = await getVisaData();

    if (!visaData.hero || !visaData.hero.summaryList) {
      return res.status(400).json({ error: "Invalid visa data structure" });
    }

    const countryIndex = visaData.hero.summaryList.findIndex(
      (c) => c.slug === slug,
    );

    if (countryIndex === -1) {
      return res.status(404).json({ error: `Country "${slug}" not found` });
    }

    const deletedCountry = visaData.hero.summaryList[countryIndex];
    visaData.hero.summaryList.splice(countryIndex, 1);

    // Update database
    const updatedData = {
      ...(visaData.toObject ? visaData.toObject() : visaData),
    };

    if (visaData._id) {
      await Visa.findByIdAndUpdate(visaData._id, updatedData, { new: true });
    } else {
      await Visa.create(updatedData);
    }

    console.log(`✅ Country "${deletedCountry.name}" deleted successfully`);
    res.json({
      success: true,
      message: `Country "${deletedCountry.name}" deleted successfully`,
    });
  } catch (err) {
    console.error("Delete country error:", err);
    res.status(500).json({ error: err.message });
  }
};

// -------------------- Public API Exports --------------------

// API to get all visa data for frontend
exports.api = async (req, res) => {
  try {
    const visaData = await getVisaData();
    if (!visaData) {
      return res.status(404).json({
        success: false,
        error: "Visa data not found",
        data: null,
      });
    }
    const heroData = visaData?.hero;

    // 2. Lấy riêng phần hero (Dùng biến mới, không gán đè vào const)
    const baseUrl =
      process.env.BACKEND_URL || `${req.protocol}://${req.get("host")}`;
    const processedData = addBaseUrlToImages(heroData, baseUrl);

    return res.json({
      success: true,
      hero: processedData,
    });
  } catch (err) {
    console.error("Visa API error:", err);
    res.status(500).json({
      success: false,
      error: "Error loading visa data",
    });
  }
};

// API to get all countries (summaryList only)
exports.apiCountries = async (req, res) => {
  try {
    const visaData = await getVisaData();

    if (!visaData || !visaData.hero || !visaData.hero.summaryList) {
      return res.status(404).json({
        success: false,
        error: "Countries data not found",
        data: null,
      });
    }

    const baseUrl =
      process.env.BACKEND_URL || `${req.protocol}://${req.get("host")}`;

    // 1. Lọc bỏ 'viewDetail' khỏi từng quốc gia trong danh sách
    const filteredCountries = visaData.hero.summaryList.map((item) => {
      // Dùng destructuring để tách viewDetail ra và gom phần còn lại vào countryInfo
      const { detailedView, ...countryInfo } = item;
      return countryInfo;
    });

    // 2. Gắn baseUrl vào ảnh cho danh sách đã lọc
    const processedData = addBaseUrlToImages(filteredCountries, baseUrl);

    return res.json({
      success: true,
      data: processedData, // Lúc này data chỉ chứa thông tin quốc gia, không có viewDetail
    });
  } catch (err) {
    console.error("Countries API error:", err);
    res.status(500).json({
      success: false,
      error: "Error loading countries data",
    });
  }
};

// API to get single country by slug
exports.apiCountry = async (req, res) => {
  try {
    const { slug } = req.params;
    const visaData = await getVisaData();

    if (!visaData || !visaData.hero || !visaData.hero.summaryList) {
      return res.status(404).json({
        success: false,
        error: "Visa data not found",
        data: null,
      });
    }

    // 1. Tìm quốc gia khớp với slug
    const country = visaData.hero.summaryList.find((c) => c.slug === slug);

    // 2. Kiểm tra nếu không thấy quốc gia hoặc quốc gia đó không có viewDetail
    if (!country || !country.viewDetail) {
      return res.status(404).json({
        success: false,
        error: `Detailed information for country "${slug}" not found`,
        data: null,
      });
    }

    const baseUrl =
      process.env.BACKEND_URL || `${req.protocol}://${req.get("host")}`;

    // 3. Chỉ lấy phần chi tiết (detailed view)
    // Lưu ý: Chúng ta copy ra object mới để tránh tham chiếu dữ liệu gốc
    const detailedData = JSON.parse(JSON.stringify(country.viewDetail));

    // 4. Gắn baseUrl vào các ảnh nằm trong phần chi tiết này
    const processedData = addBaseUrlToImages(detailedData, baseUrl);

    return res.json({
      success: true,
      data: processedData, // Trả về nội dung của detailedView
    });
  } catch (err) {
    console.error("Visa country API error:", err);
    res.status(500).json({
      success: false,
      error: "Error loading country detailed data",
    });
  }
};

// API to get hero data (title + summaryList)
exports.apiHero = async (req, res) => {
  try {
    const visaData = await getVisaData();

    // 1. Kiểm tra dữ liệu gốc

    if (!visaData || !visaData.hero) {
      return res.status(404).json({
        success: false,
        error: "Hero data not found",
        data: null,
      });
    }
    const { summaryList, ...heroData } = JSON.parse(
      JSON.stringify(visaData.hero),
    );

    const baseUrl =
      process.env.BACKEND_URL || `${req.protocol}://${req.get("host")}`;
    const processedData = addBaseUrlToImages(heroData, baseUrl);

    return res.json({
      success: true,
      data: processedData,
    });
  } catch (err) {
    console.error("Visa hero API error:", err);
    res.status(500).json({
      success: false,
      error: "Error loading hero data",
    });
  }
};