import { describe, it, expect, vi, beforeEach } from "vitest";
import { NextRequest } from "next/server";
import { POST, GET } from "@/app/api/webhooks/saleor/route";
import { orderNotificationService } from "@/lib/services/OrderNotificationService";
import { analyticsService } from "@/lib/services/AnalyticsService";
import { mockOrderPayload, mockOrderWithTracking, mockOrderCancelled } from "../../../fixtures/orders";

// Mock the services
vi.mock("@/lib/services/OrderNotificationService", () => ({
  orderNotificationService: {
    sendOrderConfirmation: vi.fn().mockResolvedValue(undefined),
    sendOrderConfirmationToAdmin: vi.fn().mockResolvedValue(undefined),
    sendOrderShipped: vi.fn().mockResolvedValue(undefined),
    sendOrderShippedToAdmin: vi.fn().mockResolvedValue(undefined),
    sendOrderCancelled: vi.fn().mockResolvedValue(undefined),
    sendOrderCancelledToAdmin: vi.fn().mockResolvedValue(undefined),
    sendOrderPaid: vi.fn().mockResolvedValue(undefined),
    sendOrderPaidToAdmin: vi.fn().mockResolvedValue(undefined),
  },
}));

vi.mock("@/lib/services/AnalyticsService", () => ({
  analyticsService: {
    trackOrderReceived: vi.fn().mockResolvedValue(undefined),
    trackRevenue: vi.fn().mockResolvedValue(undefined),
    track: vi.fn().mockResolvedValue(undefined),
  },
}));

describe("Saleor Webhook Handler", () => {
  beforeEach(() => {
    vi.clearAllMocks();
  });

  describe("GET /api/webhooks/saleor", () => {
    it("should return health check response", async () => {
      const response = await GET();
      const data = await response.json();

      expect(response.status).toBe(200);
      expect(data.status).toBe("ok");
      expect(data.supportedEvents).toContain("ORDER_CONFIRMED");
      expect(data.supportedEvents).toContain("ORDER_CREATED");
    });
  });

  describe("POST /api/webhooks/saleor - ORDER_CONFIRMED", () => {
    it("should process ORDER_CONFIRMED and send customer + admin emails", async () => {
      const request = new NextRequest("http://localhost:3000/api/webhooks/saleor", {
        method: "POST",
        headers: {
          "saleor-event": "ORDER_CONFIRMED",
          "saleor-domain": "api.manoonoils.com",
        },
        body: JSON.stringify([mockOrderPayload]),
      });

      const response = await POST(request);
      const data = await response.json();

      expect(response.status).toBe(200);
      expect(data.success).toBe(true);

      // Should send customer email
      expect(orderNotificationService.sendOrderConfirmation).toHaveBeenCalledTimes(1);

      // Should send admin email
      expect(orderNotificationService.sendOrderConfirmationToAdmin).toHaveBeenCalledTimes(1);

      // Should track analytics
      expect(analyticsService.trackOrderReceived).toHaveBeenCalledTimes(1);
      expect(analyticsService.trackRevenue).toHaveBeenCalledTimes(1);

      // Verify revenue tracking has correct data
      expect(analyticsService.trackRevenue).toHaveBeenCalledWith({
        amount: 10000,
        currency: "RSD",
        orderId: mockOrderPayload.id,
        orderNumber: String(mockOrderPayload.number),
      });
    });

    it("should NOT track analytics for ORDER_CREATED (prevents duplication)", async () => {
      const request = new NextRequest("http://localhost:3000/api/webhooks/saleor", {
        method: "POST",
        headers: {
          "saleor-event": "ORDER_CREATED",
          "saleor-domain": "api.manoonoils.com",
        },
        body: JSON.stringify([mockOrderPayload]),
      });

      const response = await POST(request);
      expect(response.status).toBe(200);

      // Should NOT send customer email
      expect(orderNotificationService.sendOrderConfirmation).not.toHaveBeenCalled();

      // Should NOT track analytics
      expect(analyticsService.trackOrderReceived).not.toHaveBeenCalled();
      expect(analyticsService.trackRevenue).not.toHaveBeenCalled();

      // Should still send admin notification
      expect(orderNotificationService.sendOrderConfirmationToAdmin).toHaveBeenCalledTimes(1);
    });
  });

  describe("POST /api/webhooks/saleor - ORDER_FULFILLED", () => {
    it("should send shipping emails with tracking info", async () => {
      const request = new NextRequest("http://localhost:3000/api/webhooks/saleor", {
        method: "POST",
        headers: {
          "saleor-event": "ORDER_FULFILLED",
          "saleor-domain": "api.manoonoils.com",
        },
        body: JSON.stringify([mockOrderWithTracking]),
      });

      const response = await POST(request);
      expect(response.status).toBe(200);

      expect(orderNotificationService.sendOrderShipped).toHaveBeenCalledWith(
        expect.any(Object),
        "TRK123456789",
        "https://tracking.example.com/TRK123456789"
      );

      expect(orderNotificationService.sendOrderShippedToAdmin).toHaveBeenCalledWith(
        expect.any(Object),
        "TRK123456789",
        "https://tracking.example.com/TRK123456789"
      );
    });
  });

  describe("POST /api/webhooks/saleor - ORDER_CANCELLED", () => {
    it("should send cancellation emails with reason", async () => {
      const request = new NextRequest("http://localhost:3000/api/webhooks/saleor", {
        method: "POST",
        headers: {
          "saleor-event": "ORDER_CANCELLED",
          "saleor-domain": "api.manoonoils.com",
        },
        body: JSON.stringify([mockOrderCancelled]),
      });

      const response = await POST(request);
      expect(response.status).toBe(200);

      expect(orderNotificationService.sendOrderCancelled).toHaveBeenCalledWith(
        expect.any(Object),
        "Customer requested cancellation"
      );

      expect(orderNotificationService.sendOrderCancelledToAdmin).toHaveBeenCalledWith(
        expect.any(Object),
        "Customer requested cancellation"
      );
    });
  });

  describe("POST /api/webhooks/saleor - ORDER_FULLY_PAID", () => {
    it("should send payment confirmation emails", async () => {
      const request = new NextRequest("http://localhost:3000/api/webhooks/saleor", {
        method: "POST",
        headers: {
          "saleor-event": "ORDER_FULLY_PAID",
          "saleor-domain": "api.manoonoils.com",
        },
        body: JSON.stringify([mockOrderPayload]),
      });

      const response = await POST(request);
      expect(response.status).toBe(200);

      expect(orderNotificationService.sendOrderPaid).toHaveBeenCalledTimes(1);
      expect(orderNotificationService.sendOrderPaidToAdmin).toHaveBeenCalledTimes(1);
    });
  });

  describe("Error Handling", () => {
    it("should return 400 for missing order in payload", async () => {
      const request = new NextRequest("http://localhost:3000/api/webhooks/saleor", {
        method: "POST",
        headers: {
          "saleor-event": "ORDER_CONFIRMED",
          "saleor-domain": "api.manoonoils.com",
        },
        body: JSON.stringify([]), // Empty array
      });

      const response = await POST(request);
      const data = await response.json();

      expect(response.status).toBe(400);
      expect(data.error).toBe("No order in payload");
    });

    it("should return 400 for missing saleor-event header", async () => {
      const request = new NextRequest("http://localhost:3000/api/webhooks/saleor", {
        method: "POST",
        headers: {
          "saleor-domain": "api.manoonoils.com",
        },
        body: JSON.stringify([mockOrderPayload]),
      });

      const response = await POST(request);
      const data = await response.json();

      expect(response.status).toBe(400);
      expect(data.error).toBe("Missing saleor-event header");
    });

    it("should return 200 for unsupported events (graceful skip)", async () => {
      const request = new NextRequest("http://localhost:3000/api/webhooks/saleor", {
        method: "POST",
        headers: {
          "saleor-event": "UNSUPPORTED_EVENT",
          "saleor-domain": "api.manoonoils.com",
        },
        body: JSON.stringify([mockOrderPayload]),
      });

      const response = await POST(request);
      const data = await response.json();

      expect(response.status).toBe(200);
      expect(data.message).toBe("Event not supported");
    });

    it("should handle server errors gracefully", async () => {
      // Simulate service throwing error
      vi.mocked(orderNotificationService.sendOrderConfirmationToAdmin).mockRejectedValueOnce(
        new Error("Email service down")
      );

      const request = new NextRequest("http://localhost:3000/api/webhooks/saleor", {
        method: "POST",
        headers: {
          "saleor-event": "ORDER_CREATED",
          "saleor-domain": "api.manoonoils.com",
        },
        body: JSON.stringify([mockOrderPayload]),
      });

      const response = await POST(request);
      expect(response.status).toBe(500);
    });
  });

  describe("Currency Handling", () => {
    it("should preserve RSD currency from Saleor payload", async () => {
      const rsdOrder = {
        ...mockOrderPayload,
        total_gross_amount: "5479",
        channel: { currency_code: "RSD" },
      };

      const request = new NextRequest("http://localhost:3000/api/webhooks/saleor", {
        method: "POST",
        headers: {
          "saleor-event": "ORDER_CONFIRMED",
          "saleor-domain": "api.manoonoils.com",
        },
        body: JSON.stringify([rsdOrder]),
      });

      await POST(request);

      // Verify the order passed to analytics has correct currency
      expect(analyticsService.trackRevenue).toHaveBeenCalledWith(
        expect.objectContaining({
          amount: 5479,
          currency: "RSD",
        })
      );
    });
  });
});