import { describe, expect, it, vi, beforeEach } from "vitest";
import type { H3Event } from "h3";

// Mock the auth utility
const mocks = vi.hoisted(() => ({
  authHandler: vi.fn(),
  defineEventHandler: vi.fn((handler) => handler),
  toWebRequest: vi.fn((event: H3Event) => {
    // Create a mock Request object
    const url = event.node.req.url || "/";
    const method = event.node.req.method || "GET";
    return new Request(`http://localhost${url}`, {
      method,
      headers: event.node.req.headers as HeadersInit,
    });
  }),
}));

vi.mock("~~/shared/utils/auth", () => ({
  auth: {
    handler: mocks.authHandler,
  },
}));

// Mock H3 utilities
vi.mock("h3", async () => {
  const actual = await vi.importActual<typeof import("h3")>("h3");
  return {
    ...actual,
    defineEventHandler: mocks.defineEventHandler,
    toWebRequest: mocks.toWebRequest,
  };
});

describe("Auth API Handler", () => {
  let handler: any;

  beforeEach(async () => {
    vi.clearAllMocks();

    // Set up global functions for Nuxt auto-imports
    (globalThis as any).defineEventHandler = mocks.defineEventHandler;
    (globalThis as any).toWebRequest = mocks.toWebRequest;

    // Dynamically import the handler after mocks are set up
    const module = await import("../../../server/api/[...auth]");
    handler = module.default;
  });

  it("should be defined", () => {
    expect(handler).toBeDefined();
    expect(typeof handler).toBe("function");
  });

  it("should call auth.handler with converted web request", async () => {
    // Mock H3Event
    const mockEvent = {
      node: {
        req: {
          method: "POST",
          url: "/api/auth/sign-in",
          headers: {
            "content-type": "application/json",
          },
        },
        res: {},
      },
      context: {},
    } as unknown as H3Event;

    // Mock the response from auth.handler
    const mockResponse = new Response(JSON.stringify({ success: true }), {
      status: 200,
      headers: { "content-type": "application/json" },
    });
    mocks.authHandler.mockResolvedValue(mockResponse);

    // Call the handler
    const result = await handler(mockEvent);

    // Verify auth.handler was called
    expect(mocks.authHandler).toHaveBeenCalledTimes(1);

    // Verify the result
    expect(result).toBe(mockResponse);
  });

  it("should handle GET requests", async () => {
    const mockEvent = {
      node: {
        req: {
          method: "GET",
          url: "/api/auth/session",
          headers: {},
        },
        res: {},
      },
      context: {},
    } as unknown as H3Event;

    const mockResponse = new Response(JSON.stringify({ user: null }), {
      status: 200,
      headers: { "content-type": "application/json" },
    });
    mocks.authHandler.mockResolvedValue(mockResponse);

    const result = await handler(mockEvent);

    expect(mocks.authHandler).toHaveBeenCalledTimes(1);
    expect(result).toBe(mockResponse);
  });

  it("should handle POST requests for sign-in", async () => {
    const mockEvent = {
      node: {
        req: {
          method: "POST",
          url: "/api/auth/sign-in/email",
          headers: {
            "content-type": "application/json",
          },
        },
        res: {},
      },
      context: {},
    } as unknown as H3Event;

    const mockResponse = new Response(
      JSON.stringify({
        user: {
          id: "123",
          email: "test@example.com",
          name: "Test User",
        },
        session: { token: "abc123" },
      }),
      {
        status: 200,
        headers: { "content-type": "application/json" },
      }
    );
    mocks.authHandler.mockResolvedValue(mockResponse);

    const result = await handler(mockEvent);

    expect(mocks.authHandler).toHaveBeenCalledTimes(1);
    expect(result).toBe(mockResponse);
  });

  it("should handle POST requests for sign-up", async () => {
    const mockEvent = {
      node: {
        req: {
          method: "POST",
          url: "/api/auth/sign-up/email",
          headers: {
            "content-type": "application/json",
          },
        },
        res: {},
      },
      context: {},
    } as unknown as H3Event;

    const mockResponse = new Response(
      JSON.stringify({
        user: {
          id: "456",
          email: "newuser@example.com",
          name: "New User",
        },
        session: { token: "xyz789" },
      }),
      {
        status: 201,
        headers: { "content-type": "application/json" },
      }
    );
    mocks.authHandler.mockResolvedValue(mockResponse);

    const result = await handler(mockEvent);

    expect(mocks.authHandler).toHaveBeenCalledTimes(1);
    expect(result).toBe(mockResponse);
  });

  it("should handle POST requests for sign-out", async () => {
    const mockEvent = {
      node: {
        req: {
          method: "POST",
          url: "/api/auth/sign-out",
          headers: {
            "content-type": "application/json",
          },
        },
        res: {},
      },
      context: {},
    } as unknown as H3Event;

    const mockResponse = new Response(JSON.stringify({ success: true }), {
      status: 200,
      headers: { "content-type": "application/json" },
    });
    mocks.authHandler.mockResolvedValue(mockResponse);

    const result = await handler(mockEvent);

    expect(mocks.authHandler).toHaveBeenCalledTimes(1);
    expect(result).toBe(mockResponse);
  });

  it("should handle error responses from auth.handler", async () => {
    const mockEvent = {
      node: {
        req: {
          method: "POST",
          url: "/api/auth/sign-in/email",
          headers: {
            "content-type": "application/json",
          },
        },
        res: {},
      },
      context: {},
    } as unknown as H3Event;

    const mockErrorResponse = new Response(
      JSON.stringify({
        error: "Invalid credentials",
      }),
      {
        status: 401,
        headers: { "content-type": "application/json" },
      }
    );
    mocks.authHandler.mockResolvedValue(mockErrorResponse);

    const result = await handler(mockEvent);

    expect(mocks.authHandler).toHaveBeenCalledTimes(1);
    expect(result).toBe(mockErrorResponse);
  });

  it("should handle different HTTP methods", async () => {
    const methods = ["GET", "POST", "PUT", "DELETE", "PATCH"];

    for (const method of methods) {
      vi.clearAllMocks();

      const mockEvent = {
        node: {
          req: {
            method,
            url: "/api/auth/test",
            headers: {},
          },
          res: {},
        },
        context: {},
      } as unknown as H3Event;

      const mockResponse = new Response(JSON.stringify({ method }), {
        status: 200,
        headers: { "content-type": "application/json" },
      });
      mocks.authHandler.mockResolvedValue(mockResponse);

      const result = await handler(mockEvent);

      expect(mocks.authHandler).toHaveBeenCalledTimes(1);
      expect(result).toBe(mockResponse);
    }
  });

  it("should convert H3Event to Web Request correctly", async () => {
    const mockEvent = {
      node: {
        req: {
          method: "POST",
          url: "/api/auth/test",
          headers: {
            "content-type": "application/json",
            authorization: "Bearer token123",
          },
        },
        res: {},
      },
      context: {},
    } as unknown as H3Event;

    const mockResponse = new Response(JSON.stringify({ success: true }), {
      status: 200,
      headers: { "content-type": "application/json" },
    });
    mocks.authHandler.mockResolvedValue(mockResponse);

    await handler(mockEvent);

    // Verify that auth.handler was called with a Request object
    expect(mocks.authHandler).toHaveBeenCalledTimes(1);
    const callArg = mocks.authHandler.mock.calls[0][0];

    // The argument should be a Request object (from toWebRequest conversion)
    expect(callArg).toBeDefined();
  });

  it("should handle requests with query parameters", async () => {
    const mockEvent = {
      node: {
        req: {
          method: "GET",
          url: "/api/auth/session?redirect=/dashboard",
          headers: {},
        },
        res: {},
      },
      context: {},
    } as unknown as H3Event;

    const mockResponse = new Response(JSON.stringify({ user: null }), {
      status: 200,
      headers: { "content-type": "application/json" },
    });
    mocks.authHandler.mockResolvedValue(mockResponse);

    const result = await handler(mockEvent);

    expect(mocks.authHandler).toHaveBeenCalledTimes(1);
    expect(result).toBe(mockResponse);
  });

  it("should handle requests with different content types", async () => {
    const contentTypes = ["application/json", "application/x-www-form-urlencoded", "multipart/form-data"];

    for (const contentType of contentTypes) {
      vi.clearAllMocks();

      const mockEvent = {
        node: {
          req: {
            method: "POST",
            url: "/api/auth/sign-in",
            headers: {
              "content-type": contentType,
            },
          },
          res: {},
        },
        context: {},
      } as unknown as H3Event;

      const mockResponse = new Response(JSON.stringify({ success: true }), {
        status: 200,
        headers: { "content-type": "application/json" },
      });
      mocks.authHandler.mockResolvedValue(mockResponse);

      const result = await handler(mockEvent);

      expect(mocks.authHandler).toHaveBeenCalledTimes(1);
      expect(result).toBe(mockResponse);
    }
  });
});