// ABOUTME: Unit tests for Next.js middleware page protection.
// ABOUTME: Tests that protected routes redirect to login when unauthenticated.
import type { NextRequest } from "next/server";
import { beforeEach, describe, expect, it, vi } from "vitest";

import { config, middleware } from "./middleware";

describe("middleware", () => {
  beforeEach(() => {
    vi.clearAllMocks();
  });

  function createMockRequest(url: string, cookieValue?: string): NextRequest {
    const request = {
      nextUrl: new URL(url, "http://localhost:3000"),
      url: `http://localhost:3000${url}`,
      cookies: {
        get: vi
          .fn()
          .mockReturnValue(
            cookieValue ? { name: "pb_auth", value: cookieValue } : undefined,
          ),
      },
    } as unknown as NextRequest;
    return request;
  }

  describe("protected routes", () => {
    it("redirects to /login when pb_auth cookie is missing", async () => {
      const request = createMockRequest("/");
      const response = await middleware(request);

      expect(response.status).toBe(307);
      expect(response.headers.get("location")).toBe(
        "http://localhost:3000/login",
      );
    });

    it("redirects to /login when pb_auth cookie is empty", async () => {
      const request = createMockRequest("/", "");
      const response = await middleware(request);

      expect(response.status).toBe(307);
      expect(response.headers.get("location")).toBe(
        "http://localhost:3000/login",
      );
    });

    it("allows access when pb_auth cookie is present", async () => {
      const request = createMockRequest("/", "valid-token");
      const response = await middleware(request);

      expect(response.status).toBe(200);
    });

    it("redirects /settings to /login when unauthenticated", async () => {
      const request = createMockRequest("/settings");
      const response = await middleware(request);

      expect(response.status).toBe(307);
      expect(response.headers.get("location")).toBe(
        "http://localhost:3000/login",
      );
    });

    it("redirects /calendar to /login when unauthenticated", async () => {
      const request = createMockRequest("/calendar");
      const response = await middleware(request);

      expect(response.status).toBe(307);
      expect(response.headers.get("location")).toBe(
        "http://localhost:3000/login",
      );
    });
  });

  describe("public routes", () => {
    it("allows /login without authentication", async () => {
      const request = createMockRequest("/login");
      const response = await middleware(request);

      expect(response.status).toBe(200);
    });

    it("allows /login even with authentication cookie", async () => {
      const request = createMockRequest("/login", "valid-token");
      const response = await middleware(request);

      // Could redirect authenticated users away from login, but for now just allow
      expect(response.status).toBe(200);
    });
  });

  describe("API routes", () => {
    it("skips middleware for /api routes (handled by route-level auth)", async () => {
      const request = createMockRequest("/api/user");
      const response = await middleware(request);

      // API routes are not processed by this middleware
      expect(response.status).toBe(200);
    });

    it("skips middleware for /api/calendar ICS endpoint", async () => {
      const request = createMockRequest("/api/calendar/user123/token.ics");
      const response = await middleware(request);

      expect(response.status).toBe(200);
    });
  });

  describe("static assets", () => {
    it("skips middleware for _next static assets", async () => {
      const request = createMockRequest("/_next/static/chunk.js");
      const response = await middleware(request);

      expect(response.status).toBe(200);
    });

    it("skips middleware for favicon", async () => {
      const request = createMockRequest("/favicon.ico");
      const response = await middleware(request);

      expect(response.status).toBe(200);
    });
  });
});

describe("middleware config", () => {
  it("exports a matcher configuration", () => {
    expect(config).toBeDefined();
    expect(config.matcher).toBeDefined();
    expect(Array.isArray(config.matcher)).toBe(true);
  });
});