const request = require("supertest");
const multer = require("multer");
const cloudinary = require("cloudinary").v2;
const app = require("../server");
const User = require("../models/User");
const Post = require("../models/Post");
const Report = require("../models/Report");
const { generateTestId } = require('./utils/idGenerator');

// Mock Cloudinary
jest.mock("cloudinary", () => ({
  v2: {
    config: jest.fn(),
    uploader: {
      upload: jest.fn(),
      destroy: jest.fn(),
    },
  },
}));

describe("File Upload System", () => {
  let testUser;
  let authToken;

  beforeAll(async () => {
    // Configure test Cloudinary settings
    cloudinary.config({
      cloud_name: "test_cloud",
      api_key: "test_key",
      api_secret: "test_secret",
    });

    // Create test user
    testUser = await User.create({
      name: "Test User",
      email: "test@example.com",
      password: "password123",
    });

    // Generate auth token
    const jwt = require("jsonwebtoken");
    authToken = jwt.sign(
      { user: { id: testUser._id } },
      process.env.JWT_SECRET || "test_secret"
    );
  });



  beforeEach(() => {
    // Reset Cloudinary mocks
    cloudinary.uploader.upload.mockReset();
    cloudinary.uploader.destroy.mockReset();
  });

  describe("Profile Picture Upload", () => {
    test("should upload profile picture successfully", async () => {
      const mockCloudinaryResponse = {
        secure_url: "https://cloudinary.com/test/profile.jpg",
        public_id: "profile_test123",
        width: 500,
        height: 500,
        format: "jpg",
      };

      cloudinary.uploader.upload.mockResolvedValue(mockCloudinaryResponse);

      const response = await request(app)
        .put("/api/users/profile-picture")
        .set("x-auth-token", authToken)
        .attach("profilePicture", Buffer.from("fake image data"), "profile.jpg")
        .expect(200);

      expect(response.body.profilePicture).toBe(mockCloudinaryResponse.secure_url);
      expect(response.body.cloudinaryPublicId).toBe(mockCloudinaryResponse.public_id);

      // Verify Cloudinary upload was called with correct options
      expect(cloudinary.uploader.upload).toHaveBeenCalledWith(
        expect.any(Buffer),
        expect.objectContaining({
          folder: "profile-pictures",
          transformation: [
            { width: 500, height: 500, crop: "fill" },
            { quality: "auto" },
          ],
        })
      );

      // Verify user was updated
      const updatedUser = await User.findById(testUser._id);
      expect(updatedUser.profilePicture).toBe(mockCloudinaryResponse.secure_url);
    });

    test("should reject invalid file types for profile picture", async () => {
      const response = await request(app)
        .put("/api/users/profile-picture")
        .set("x-auth-token", authToken)
        .attach("profilePicture", Buffer.from("fake file data"), "document.pdf")
        .expect(400);

      expect(response.body.msg).toContain("Only image files are allowed");
    });

    test("should reject oversized files for profile picture", async () => {
      // Create a large buffer (6MB)
      const largeBuffer = Buffer.alloc(6 * 1024 * 1024, "a");

      const response = await request(app)
        .put("/api/users/profile-picture")
        .set("x-auth-token", authToken)
        .attach("profilePicture", largeBuffer, "large.jpg")
        .expect(400);

      expect(response.body.msg).toContain("File size too large");
    });

    test("should handle Cloudinary upload errors", async () => {
      cloudinary.uploader.upload.mockRejectedValue(new Error("Cloudinary error"));

      const response = await request(app)
        .put("/api/users/profile-picture")
        .set("x-auth-token", authToken)
        .attach("profilePicture", Buffer.from("fake image data"), "profile.jpg")
        .expect(500);

      expect(response.body.msg).toContain("Error uploading profile picture");
    });

    test("should require authentication for profile picture upload", async () => {
      const response = await request(app)
        .put("/api/users/profile-picture")
        .attach("profilePicture", Buffer.from("fake image data"), "profile.jpg")
        .expect(401);
    });
  });

  describe("Post Image Upload", () => {
    test("should upload post image successfully", async () => {
      const mockCloudinaryResponse = {
        secure_url: "https://cloudinary.com/test/post.jpg",
        public_id: "post_test123",
        width: 800,
        height: 600,
        format: "jpg",
      };

      cloudinary.uploader.upload.mockResolvedValue(mockCloudinaryResponse);

      const postData = {
        content: "Test post with image",
      };

      const response = await request(app)
        .post("/api/posts")
        .set("x-auth-token", authToken)
        .field("content", postData.content)
        .attach("image", Buffer.from("fake image data"), "post.jpg")
        .expect(200);

      expect(response.body.imageUrl).toBe(mockCloudinaryResponse.secure_url);
      expect(response.body.cloudinaryPublicId).toBe(mockCloudinaryResponse.public_id);
      expect(response.body.content).toBe(postData.content);

      // Verify Cloudinary upload was called with correct options
      expect(cloudinary.uploader.upload).toHaveBeenCalledWith(
        expect.any(Buffer),
        expect.objectContaining({
          folder: "post-images",
          transformation: [
            { width: 1200, height: 800, crop: "limit" },
            { quality: "auto" },
          ],
        })
      );

      // Verify post was created with image
      const post = await Post.findById(response.body._id);
      expect(post.imageUrl).toBe(mockCloudinaryResponse.secure_url);
      expect(post.cloudinaryPublicId).toBe(mockCloudinaryResponse.public_id);
    });

    test("should create post without image", async () => {
      const postData = {
        content: "Test post without image",
      };

      const response = await request(app)
        .post("/api/posts")
        .set("x-auth-token", authToken)
        .send(postData)
        .expect(200);

      expect(response.body.content).toBe(postData.content);
      expect(response.body.imageUrl).toBeUndefined();
      expect(response.body.cloudinaryPublicId).toBeUndefined();
    });

    test("should reject invalid file types for post image", async () => {
      const response = await request(app)
        .post("/api/posts")
        .set("x-auth-token", authToken)
        .field("content", "Test post")
        .attach("image", Buffer.from("fake file data"), "document.pdf")
        .expect(400);

      expect(response.body.msg).toContain("Only image files are allowed");
    });

    test("should handle post image upload errors gracefully", async () => {
      cloudinary.uploader.upload.mockRejectedValue(new Error("Upload failed"));

      const response = await request(app)
        .post("/api/posts")
        .set("x-auth-token", authToken)
        .field("content", "Test post")
        .attach("image", Buffer.from("fake image data"), "post.jpg")
        .expect(500);

      expect(response.body.msg).toContain("Error creating post");
    });
  });

  describe("Report Image Upload", () => {
    let testStreet;

    beforeEach(async () => {
      testStreet = generateTestId();
    });

    test("should upload report image successfully", async () => {
      const mockCloudinaryResponse = {
        secure_url: "https://cloudinary.com/test/report.jpg",
        public_id: "report_test123",
        width: 800,
        height: 600,
        format: "jpg",
      };

      cloudinary.uploader.upload.mockResolvedValue(mockCloudinaryResponse);

      const reportData = {
        street: { streetId: testStreet.toString() },
        issue: "Pothole on the street",
      };

      const response = await request(app)
        .post("/api/reports")
        .set("x-auth-token", authToken)
        .field("street[streetId]", reportData.street.streetId)
        .field("issue", reportData.issue)
        .attach("image", Buffer.from("fake image data"), "report.jpg")
        .expect(200);

      expect(response.body.imageUrl).toBe(mockCloudinaryResponse.secure_url);
      expect(response.body.cloudinaryPublicId).toBe(mockCloudinaryResponse.public_id);
      expect(response.body.issue).toBe(reportData.issue);

      // Verify Cloudinary upload was called with correct options
      expect(cloudinary.uploader.upload).toHaveBeenCalledWith(
        expect.any(Buffer),
        expect.objectContaining({
          folder: "report-images",
          transformation: [
            { width: 1200, height: 800, crop: "limit" },
            { quality: "auto" },
          ],
        })
      );

      // Verify report was created with image
      const report = await Report.findById(response.body._id);
      expect(report.imageUrl).toBe(mockCloudinaryResponse.secure_url);
      expect(report.cloudinaryPublicId).toBe(mockCloudinaryResponse.public_id);
    });

    test("should create report without image", async () => {
      const reportData = {
        street: { streetId: testStreet.toString() },
        issue: "Street light not working",
      };

      const response = await request(app)
        .post("/api/reports")
        .set("x-auth-token", authToken)
        .send(reportData)
        .expect(200);

      expect(response.body.issue).toBe(reportData.issue);
      expect(response.body.imageUrl).toBeUndefined();
      expect(response.body.cloudinaryPublicId).toBeUndefined();
    });

    test("should reject oversized report images", async () => {
      const largeBuffer = Buffer.alloc(8 * 1024 * 1024, "a"); // 8MB

      const response = await request(app)
        .post("/api/reports")
        .set("x-auth-token", authToken)
        .field("street[streetId]", testStreet.toString())
        .field("issue", "Test issue")
        .attach("image", largeBuffer, "large.jpg")
        .expect(400);

      expect(response.body.msg).toContain("File size too large");
    });
  });

  describe("Image Deletion and Cleanup", () => {
    test("should delete old profile picture when uploading new one", async () => {
      // Set initial profile picture
      await User.findByIdAndUpdate(testUser._id, {
        profilePicture: "https://cloudinary.com/test/old_profile.jpg",
        cloudinaryPublicId: "old_profile123",
      });

      const mockCloudinaryResponse = {
        secure_url: "https://cloudinary.com/test/new_profile.jpg",
        public_id: "new_profile456",
      };

      cloudinary.uploader.upload.mockResolvedValue(mockCloudinaryResponse);
      cloudinary.uploader.destroy.mockResolvedValue({ result: "ok" });

      await request(app)
        .put("/api/users/profile-picture")
        .set("x-auth-token", authToken)
        .attach("profilePicture", Buffer.from("fake image data"), "new_profile.jpg")
        .expect(200);

      // Verify old image was deleted
      expect(cloudinary.uploader.destroy).toHaveBeenCalledWith("old_profile123");
    });

    test("should handle image deletion errors gracefully", async () => {
      // Set initial profile picture
      await User.findByIdAndUpdate(testUser._id, {
        profilePicture: "https://cloudinary.com/test/old_profile.jpg",
        cloudinaryPublicId: "old_profile123",
      });

      const mockCloudinaryResponse = {
        secure_url: "https://cloudinary.com/test/new_profile.jpg",
        public_id: "new_profile456",
      };

      cloudinary.uploader.upload.mockResolvedValue(mockCloudinaryResponse);
      cloudinary.uploader.destroy.mockRejectedValue(new Error("Delete failed"));

      const response = await request(app)
        .put("/api/users/profile-picture")
        .set("x-auth-token", authToken)
        .attach("profilePicture", Buffer.from("fake image data"), "new_profile.jpg")
        .expect(200);

      // Should still succeed even if deletion fails
      expect(response.body.profilePicture).toBe(mockCloudinaryResponse.secure_url);
    });
  });

  describe("File Validation and Security", () => {
    test("should validate image file signatures", async () => {
      // Create a buffer with PDF signature but .jpg extension
      const pdfBuffer = Buffer.from("%PDF-1.4", "binary");

      const response = await request(app)
        .put("/api/users/profile-picture")
        .set("x-auth-token", authToken)
        .attach("profilePicture", pdfBuffer, "fake.jpg")
        .expect(400);

      expect(response.body.msg).toContain("Invalid image file");
    });

    test("should sanitize filenames", async () => {
      const mockCloudinaryResponse = {
        secure_url: "https://cloudinary.com/test/profile.jpg",
        public_id: "profile_sanitized123",
      };

      cloudinary.uploader.upload.mockResolvedValue(mockCloudinaryResponse);

      await request(app)
        .put("/api/users/profile-picture")
        .set("x-auth-token", authToken)
        .attach("profilePicture", Buffer.from("fake image data"), "../../../etc/passwd.jpg")
        .expect(200);

      // Verify Cloudinary was called and didn't use malicious filename
      expect(cloudinary.uploader.upload).toHaveBeenCalled();
      expect(cloudinary.uploader.upload).not.toHaveBeenCalledWith(
        expect.anything(),
        expect.objectContaining({
          public_id: expect.stringContaining("../"),
        })
      );
    });

    test("should apply appropriate transformations for different use cases", async () => {
      const mockProfileResponse = {
        secure_url: "https://cloudinary.com/test/profile.jpg",
        public_id: "profile123",
      };

      const mockPostResponse = {
        secure_url: "https://cloudinary.com/test/post.jpg",
        public_id: "post123",
      };

      cloudinary.uploader.upload
        .mockResolvedValueOnce(mockProfileResponse)
        .mockResolvedValueOnce(mockPostResponse);

      // Test profile picture upload
      await request(app)
        .put("/api/users/profile-picture")
        .set("x-auth-token", authToken)
        .attach("profilePicture", Buffer.from("fake image data"), "profile.jpg");

      // Verify profile picture transformations
      expect(cloudinary.uploader.upload).toHaveBeenCalledWith(
        expect.any(Buffer),
        expect.objectContaining({
          transformation: [
            { width: 500, height: 500, crop: "fill" },
            { quality: "auto" },
          ],
        })
      );

      // Test post image upload
      await request(app)
        .post("/api/posts")
        .set("x-auth-token", authToken)
        .field("content", "Test post")
        .attach("image", Buffer.from("fake image data"), "post.jpg");

      // Verify post image transformations
      expect(cloudinary.uploader.upload).toHaveBeenCalledWith(
        expect.any(Buffer),
        expect.objectContaining({
          transformation: [
            { width: 1200, height: 800, crop: "limit" },
            { quality: "auto" },
          ],
        })
      );
    });
  });

  describe("Performance and Concurrent Uploads", () => {
    test("should handle concurrent image uploads", async () => {
      const mockCloudinaryResponse = {
        secure_url: "https://cloudinary.com/test/concurrent.jpg",
        public_id: "concurrent123",
      };

      cloudinary.uploader.upload.mockResolvedValue(mockCloudinaryResponse);

      const startTime = Date.now();

      // Create 10 concurrent upload requests
      const uploads = [];
      for (let i = 0; i < 10; i++) {
        uploads.push(
          request(app)
            .put("/api/users/profile-picture")
            .set("x-auth-token", authToken)
            .attach("profilePicture", Buffer.from(`fake image data ${i}`), `profile${i}.jpg`)
        );
      }

      const responses = await Promise.all(uploads);
      const endTime = Date.now();

      // All uploads should succeed
      responses.forEach((response) => {
        expect(response.status).toBe(200);
        expect(response.body.profilePicture).toBe(mockCloudinaryResponse.secure_url);
      });

      // Should complete within reasonable time (less than 10 seconds)
      expect(endTime - startTime).toBeLessThan(10000);

      // Verify Cloudinary was called 10 times
      expect(cloudinary.uploader.upload).toHaveBeenCalledTimes(10);
    });

    test("should handle upload timeout gracefully", async () => {
      // Mock a slow upload that times out
      cloudinary.uploader.upload.mockImplementation(() => 
        new Promise((resolve, reject) => {
          setTimeout(() => reject(new Error("Upload timeout")), 100);
        })
      );

      const response = await request(app)
        .put("/api/users/profile-picture")
        .set("x-auth-token", authToken)
        .attach("profilePicture", Buffer.from("fake image data"), "profile.jpg")
        .expect(500);

      expect(response.body.msg).toContain("Error uploading profile picture");
    });
  });
});