const Insurance = require("../models/insurance");
const { addBaseUrlToImages } = require("../utils/imageHelper");
const writeAuditLog = require("../audit/writeAuditLog");
const diffObject = require("../audit/diffObject");
const AUDIT_ACTIONS = require("../constants/auditAction");

// API để lấy insurance data (cho frontend)
exports.api = async (req, res) => {
  try {
    const language = req.query.lang || "en";

    // Sử dụng getDefault để đảm bảo luôn có data
    const insurance = await Insurance.getDefault(language);

    // Trả về data với cấu trúc mới
    const insuranceData = insurance.toObject();

    // Sử dụng helper để thêm base URL vào đường dẫn ảnh
    const baseUrl =
      process.env.BACKEND_URL ?? `${req.protocol}://${req.get("host")}`;
    const processedData = addBaseUrlToImages(insuranceData, baseUrl);

    // Trả về trực tiếp hero, page, content (không wrap trong object)
    res.json({
      hero: processedData.hero,
      page: processedData.page,
      content: processedData.content,
    });
  } catch (error) {
    console.error("API Error:", error);
    res.status(500).json({
      success: false,
      error: "Error loading insurance data",
      message: error.message,
    });
  }
};

// API để lấy toàn bộ insurance data (cho admin)
exports.getInsuranceData = async (req, res) => {
  try {
    const language = req.query.lang || "en";
    const insurance = await Insurance.findOne({
      name: "default",
      language: language,
    });

    if (!insurance) {
      return res.status(404).json({
        success: false,
        error: "Insurance data not found",
      });
    }

    const insuranceData = insurance.toObject();

    // Thêm base URL vào đường dẫn ảnh
    const baseUrl =
      process.env.BACKEND_URL ?? `${req.protocol}://${req.get("host")}`;
    const processedData = addBaseUrlToImages(insuranceData, baseUrl);

    res.json({
      success: true,
      data: processedData,
    });
  } catch (error) {
    console.error("Error getting insurance data:", error);
    res.status(500).json({
      success: false,
      error: "Error loading insurance data",
    });
  }
};

// API để lấy data theo ngôn ngữ
exports.getByLanguage = async (req, res) => {
  try {
    const language = req.params.lang || "en";

    const insurance = await Insurance.findOne({
      name: "default",
      language: language,
    });

    if (!insurance) {
      return res.status(404).json({
        success: false,
        error: "Insurance data not found",
      });
    }

    const insuranceData = insurance.toObject();

    // Thêm base URL vào đường dẫn ảnh
    const baseUrl =
      process.env.BACKEND_URL ?? `${req.protocol}://${req.get("host")}`;
    const processedData = addBaseUrlToImages(insuranceData, baseUrl);

    res.json({
      success: true,
      data: {
        hero: processedData.hero,
        page: processedData.page,
        content: processedData.content,
      },
    });
  } catch (error) {
    console.error("Error getting insurance by language:", error);
    res.status(500).json({
      success: false,
      error: "Error loading insurance data",
    });
  }
};

// Render admin view
exports.index = async (req, res) => {
  try {
    // Luôn đảm bảo có default data
    const insurance = await Insurance.getDefault("en");
    const data = insurance.toObject();

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

    res.render("admin/insurance/index", {
      title: "Insurance Management",
      layout: "layouts/main",
      data,
      frontendUrl,
      currentPath: req.path,
      user: req.session.user,
    });
  } catch (error) {
    console.error("Error in insurance index:", error);
    req.flash("error_msg", "An error occurred while loading the page");
    res.redirect("/admin/dashboard");
  }
};

// Seed data từ JSON file (cấu trúc mới)
exports.seed = async (req, res) => {
  try {
    const fs = require("fs").promises;
    const path = require("path");

    // Đọc file JSON
    const jsonPath = path.join(__dirname, "../data/insurance.json");
    const jsonData = JSON.parse(await fs.readFile(jsonPath, "utf8"));

    console.log("Seeding insurance from JSON...");

    // Migrate từ cấu trúc cũ sang mới
    const insurance = await Insurance.migrateFromJson(jsonData, "en");

    res.json({
      success: true,
      message: "Insurance data seeded successfully",
      data: {
        id: insurance._id,
        hero: insurance.hero,
        page: insurance.page,
        content: insurance.content,
      },
    });
  } catch (error) {
    console.error("Error seeding insurance:", error);
    res.status(500).json({
      success: false,
      error: error.message || "Error seeding insurance data",
    });
  }
};

// API preview cho admin (tạo HTML preview)
exports.preview = async (req, res) => {
  try {
    const { hero, page, content } = req.body;

    // Parse JSON strings
    const parseJson = (data) => {
      if (!data) return null;
      if (typeof data === "string") {
        try {
          return JSON.parse(data);
        } catch (e) {
          console.error("JSON parse error:", e);
          return null;
        }
      }
      return data;
    };

    const heroData = parseJson(hero) || {};
    const pageData = parseJson(page) || {};
    const contentData = parseJson(content) || {};

    // Thêm base URL vào đường dẫn ảnh cho preview
    const baseUrl =
      process.env.BACKEND_URL ?? `${req.protocol}://${req.get("host")}`;
    const processedHeroData = addBaseUrlToImages(heroData, baseUrl);

    // Render preview HTML
    const html = `
      <!DOCTYPE html>
      <html lang="en">
      <head>
        <meta charset="UTF-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <title>${pageData.title || "Insurance Preview"}</title>
        <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.1.3/dist/css/bootstrap.min.css" rel="stylesheet">
        <style>
          body { font-family: Arial, sans-serif; }
          .hero-section {
            background: linear-gradient(rgba(0,0,0,0.7), rgba(0,0,0,0.7)), 
                       url('${processedHeroData.backgroundImage || ""}');
            background-size: cover;
            background-position: center;
            color: white;
            padding: 100px 20px;
            text-align: center;
          }
          .page-header {
            padding: 40px 20px;
            background: #f8f9fa;
          }
          .content-section {
            padding: 40px 20px;
          }
          .content-item {
            margin-bottom: 20px;
          }
        </style>
      </head>
      <body>
        <!-- Hero Section -->
        <div class="hero-section">
          <h1>${heroData.title || "Insurance"}</h1>
          <p>${heroData.subtitle || ""}</p>
        </div>
        
        <!-- Page Header -->
        <div class="page-header">
          <div class="container">
            <h2>${pageData.title || "Insurance Information"}</h2>
            ${pageData.divider !== false ? "<hr>" : ""}
          </div>
        </div>
        
        <!-- Content Section -->
        <div class="content-section">
          <div class="container">
            ${renderContentItems(contentData.content || [])}
          </div>
        </div>
      </body>
      </html>
    `;

    res.send(html);
  } catch (error) {
    console.error("Error generating preview:", error);
    res.status(500).send("Error generating preview");
  }
};

// Helper function để render content items
function renderContentItems(contentItems) {
  if (!Array.isArray(contentItems) || contentItems.length === 0) {
    return "<p>No content available.</p>";
  }

  return contentItems
    .map((item) => {
      switch (item.type) {
        case "header":
          return `<h${item.level || 2} class="content-item">${item.text}</h${item.level || 2}>`;

        case "paragraph":
          return `<p class="content-item">${item.text}</p>`;

        case "section":
          return `
          <div class="content-item">
            <h3>${item.title}</h3>
            <p>${item.content}</p>
          </div>
        `;

        case "list":
          const listItems = (item.items || [])
            .map((li) => `<li>${li}</li>`)
            .join("");
          return `<ul class="content-item">${listItems}</ul>`;

        case "note":
          return `<div class="alert alert-info content-item">${item.text}</div>`;

        case "embed":
          if (item.source === "youtube") {
            return `
            <div class="content-item">
              <iframe width="${item.width || 560}" height="${item.height || 315}" 
                src="${item.url || item.embed}" 
                frameborder="0" allowfullscreen></iframe>
              ${item.caption ? `<p class="text-muted mt-2">${item.caption}</p>` : ""}
            </div>
          `;
          }
          return "";

        default:
          return "";
      }
    })
    .join("");
}

// API để tạo insurance mới (cho các ngôn ngữ khác)
exports.create = async (req, res) => {
  try {
    const { hero, page, content, language } = req.body;

    if (!language) {
      return res.status(400).json({
        success: false,
        error: "Language is required",
      });
    }

    // Kiểm tra đã tồn tại chưa
    const existing = await Insurance.findOne({
      name: "default",
      language: language,
    });
    if (existing) {
      return res.status(400).json({
        success: false,
        error: "Insurance already exists for this language",
      });
    }

    // Parse JSON nếu cần
    const parseJson = (data) => {
      if (!data) return null;
      if (typeof data === "string") {
        try {
          return JSON.parse(data);
        } catch (e) {
          console.error("JSON parse error:", e);
          return null;
        }
      }
      return data;
    };

    const insurance = new Insurance({
      name: "default",
      language: language,
      hero: parseJson(hero) || {},
      page: parseJson(page) || {},
      content: parseJson(content) || {},
      version: "2.0.0",
      isActive: true,
      migratedFromOldStructure: false,
    });

    await insurance.save();

    res.json({
      success: true,
      message: "Insurance created successfully for language: " + language,
      data: insurance,
    });
  } catch (error) {
    console.error("Error creating insurance:", error);
    res.status(500).json({
      success: false,
      error: error.message || "Error creating insurance",
    });
  }
};

// Cập nhật dữ liệu insurance (CẬP NHẬT CẤU TRÚC MỚI)
exports.update = async (req, res) => {
  try {
    const { hero, page, content } = req.body;

    // Parse JSON strings
    const parseJson = (data) => {
      if (!data) return null;
      if (typeof data === "string") {
        try {
          return JSON.parse(data);
        } catch (e) {
          console.error("JSON parse error:", e);
          return null;
        }
      }
      return data;
    };

    // Parse all data với cấu trúc mới
    const heroData = parseJson(hero) || {};
    const pageData = parseJson(page) || {};
    const contentData = parseJson(content) || {};

    // Normalize embed blocks (convert YouTube watch URLs to /embed/ URLs)
    function extractYouTubeId(url) {
      const regex =
        /(?:youtube\.com\/(?:[^\/]+\/.+\/|(?:v|e(?:mbed)?)\/|.*[?&]v=)|youtu\.be\/)([^"&?\/\s]{11})/;
      const match = url.match(regex);
      return match ? match[1] : null;
    }

    if (contentData && Array.isArray(contentData.content)) {
      contentData.content.forEach((item) => {
        if (item.type === "embed" && item.source === "youtube") {
          if (item.url && item.url.includes("watch?v=")) {
            const videoId = extractYouTubeId(item.url);
            if (videoId) {
              item.url = `https://www.youtube.com/embed/${videoId}`;
              item.videoId = videoId;
            }
          }
          if (item.embed && item.embed.includes("watch?v=")) {
            const videoId = extractYouTubeId(item.embed);
            if (videoId) {
              item.embed = `https://www.youtube.com/embed/${videoId}`;
              item.videoId = videoId;
            }
          }
        }
      });
    }

    // Tìm hoặc tạo insurance
    let insurance = await Insurance.findOne({
      name: "default",
      language: "en",
    });

    // ✅ Capture BEFORE state
    const beforeData = insurance
      ? JSON.parse(
          JSON.stringify(insurance.toObject ? insurance.toObject() : insurance),
        )
      : {};

    if (!insurance) {
      insurance = new Insurance({
        name: "default",
        language: "en",
        hero: heroData,
        page: pageData,
        content: contentData,
        version: "2.0.0",
        isActive: true,
      });
    } else {
      insurance.hero = heroData;
      insurance.page = pageData;
      insurance.content = contentData;
      insurance.version = "2.0.0";
    }

    await insurance.save();

    // ✅ Capture AFTER state
    const afterData = JSON.parse(
      JSON.stringify(insurance.toObject ? insurance.toObject() : insurance),
    );

    // ✅ AUDIT LOGGING - Insurance Updated
    const changes = diffObject(beforeData, afterData);
    if (changes.length > 0) {
      await writeAuditLog({
        model: "Insurance",
        documentId: insurance._id,
        action: AUDIT_ACTIONS.UPDATE_INSURANCE,
        before: beforeData,
        after: afterData,
        changes,
        req,
      });
    }

    req.flash("success_msg", "Insurance updated successfully");
    res.redirect("/admin/insurance");
  } catch (err) {
    console.error("Error updating insurance:", err);
    req.flash("error_msg", err.message || "Error updating insurance");
    res.redirect("/admin/insurance");
  }
};

// API để xóa insurance (theo ngôn ngữ)
exports.delete = async (req, res) => {
  try {
    const language = req.params.lang;

    if (!language) {
      return res.status(400).json({
        success: false,
        error: "Language parameter is required",
      });
    }

    // Không cho phép xóa tiếng Anh mặc định
    if (language === "en") {
      return res.status(400).json({
        success: false,
        error: "Cannot delete default English insurance data",
      });
    }

    const result = await Insurance.deleteOne({
      name: "default",
      language: language,
    });

    if (result.deletedCount === 0) {
      return res.status(404).json({
        success: false,
        error: "Insurance not found for this language",
      });
    }

    res.json({
      success: true,
      message: "Insurance deleted successfully for language: " + language,
    });
  } catch (error) {
    console.error("Error deleting insurance:", error);
    res.status(500).json({
      success: false,
      error: error.message || "Error deleting insurance",
    });
  }
};