const Pricing = require("../models/pricing");
const writeAuditLog = require("../audit/writeAuditLog");
const diffObject = require("../audit/diffObject");
const AUDIT_ACTIONS = require("../constants/auditAction");

// ==================== CMS ADMIN FUNCTIONS ====================

// Render admin page for pricing management
exports.index = async (req, res) => {
  try {
    let pricing = await Pricing.findOne({ name: "default" });

    // If no data in DB, try to load from JSON file
    if (!pricing) {
      const fs = require("fs");
      const path = require("path");
      const jsonPath = path.join(__dirname, "../data/pricing.json");

      if (fs.existsSync(jsonPath)) {
        const jsonData = JSON.parse(fs.readFileSync(jsonPath, "utf8"));
        pricing = await Pricing.migrateFromJson(jsonData);
      } else {
        // Create default pricing
        pricing = await Pricing.create({
          name: "default",
          hero: {
            title: "Pricing Plan",
            backgroundImage: "/assets/img/inner-page/breadcrumb.jpg",
            shapeImage: "/assets/img/inner-page/shape.png",
            breadcrumb: [
              { text: "Home", link: "/" },
              { text: "Pricing Plan", link: "" },
            ],
          },
          pricingSection: {
            subtitle: "pricing plan",
            heading: "Flexible Plans to Suit Every Traveler",
            description:
              "Choose the plan that fits your visa needs and enjoy expert guidance every step of the way.",
          },
          plans: {
            monthly: [],
            yearly: [],
          },
          testimonials: {
            subtitle: "What Our Clients Say",
            heading: "Immigration Success Stories",
            buttonText: "View All Review",
            buttonLink: "/contact",
            buttonIcon: "fa-solid fa-arrow-right",
            image: "",
            items: [],
          },
        });
      }
    }

    res.render("admin/pricing/index", {
      layout: "layouts/main",
      title: "Pricing Management",
      data: pricing,
      user: req.session.user,
      frontendUrl: process.env.FRONTEND_URL || "http://localhost:3000",
    });
  } catch (err) {
    console.error("Error loading pricing admin page:", err);
    req.flash("error", "Error loading pricing data");
    res.redirect("/admin/dashboard");
  }
};

// Update pricing data
exports.update = async (req, res) => {
  try {
    const { hero, pricingSection, plans, testimonials } = req.body;

    // Parse JSON strings if needed
    const heroData = typeof hero === "string" ? JSON.parse(hero) : hero;
    const pricingSectionData =
      typeof pricingSection === "string"
        ? JSON.parse(pricingSection)
        : pricingSection;
    const plansData = typeof plans === "string" ? JSON.parse(plans) : plans;
    const testimonialsData =
      typeof testimonials === "string"
        ? JSON.parse(testimonials)
        : testimonials;

    let pricing = await Pricing.findOne({ name: "default" });

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

    if (pricing) {
      pricing.hero = heroData;
      pricing.pricingSection = pricingSectionData;
      pricing.plans = plansData;
      pricing.testimonials = testimonialsData;
      await pricing.save();
    } else {
      pricing = await Pricing.create({
        name: "default",
        hero: heroData,
        pricingSection: pricingSectionData,
        plans: plansData,
        testimonials: testimonialsData,
      });
    }

    // ✅ Capture AFTER state
    const afterData = JSON.parse(JSON.stringify(pricing.toObject()));

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

    req.flash("success", "Pricing data updated successfully");
    res.redirect("/admin/pricing");
  } catch (err) {
    console.error("Error updating pricing:", err);
    req.flash("error", "Error updating pricing data");
    res.redirect("/admin/pricing");
  }
};

// API to get pricing data (admin)
exports.getPricingData = async (req, res) => {
  try {
    let pricing = await Pricing.findOne({ name: "default" });

    if (!pricing) {
      const fs = require("fs");
      const path = require("path");
      const jsonPath = path.join(__dirname, "../data/pricing.json");

      if (fs.existsSync(jsonPath)) {
        const jsonData = JSON.parse(fs.readFileSync(jsonPath, "utf8"));
        pricing = await Pricing.migrateFromJson(jsonData);
      }
    }

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

// Public API to get pricing page data (for frontend)
exports.api = async (req, res) => {
  try {
    let pricing = await Pricing.findOne({ name: "default" });

    if (!pricing) {
      const fs = require("fs");
      const path = require("path");
      const jsonPath = path.join(__dirname, "../data/pricing.json");

      if (fs.existsSync(jsonPath)) {
        const jsonData = JSON.parse(fs.readFileSync(jsonPath, "utf8"));
        pricing = await Pricing.migrateFromJson(jsonData);
      }
    }

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

    const backendUrl = process.env.BACKEND_URL || "http://localhost:3001";

    const getFullUrl = (path) => {
      if (!path || path.startsWith("http")) return path;
      return `${backendUrl}${path.startsWith("/") ? "" : "/"}${path}`;
    };

    // Convert to plain object to modify properties safely
    const pricingData = pricing.toObject ? pricing.toObject() : pricing;

    if (pricingData.hero) {
      pricingData.hero.backgroundImage = getFullUrl(
        pricingData.hero.backgroundImage,
      );
      pricingData.hero.shapeImage = getFullUrl(pricingData.hero.shapeImage);
    }

    if (pricingData.testimonials) {
      pricingData.testimonials.image = getFullUrl(
        pricingData.testimonials.image,
      );
    }

    res.json({
      success: true,
      data: {
        hero: pricingData.hero,
        pricingSection: pricingData.pricingSection,
        plans: pricingData.plans,
        testimonials: pricingData.testimonials,
      },
    });
  } catch (err) {
    console.error("Error getting pricing API data:", err);
    res.status(500).json({
      success: false,
      error: "Error loading pricing data",
    });
  }
};