import { describe, it, expect, vi, beforeEach } from "vitest";
import request from "supertest";

import { isProKey, isValidKey, getKeyInfo } from "../services/keys.js";
import { getUsageForKey } from "../middleware/usage.js";
import { app } from "../index.js";

describe("GET /v1/usage/me", () => {
  beforeEach(() => {
    vi.clearAllMocks();
  });

  it("returns 401 without auth", async () => {
    const res = await request(app).get("/v1/usage/me");
    expect(res.status).toBe(401);
  });

  it("returns usage for authenticated Pro key", async () => {
    vi.mocked(isProKey).mockReturnValue(true);
    vi.mocked(isValidKey).mockReturnValue(true);
    vi.mocked(getKeyInfo).mockReturnValue({
      key: "test-key", tier: "pro", email: "test@docfast.dev", createdAt: new Date().toISOString(),
    } as any);
    vi.mocked(getUsageForKey).mockReturnValue({ count: 142, monthKey: "2026-03" });

    const res = await request(app)
      .get("/v1/usage/me")
      .set("X-API-Key", "test-key");

    expect(res.status).toBe(200);
    expect(res.body).toEqual({
      used: 142,
      limit: 5000,
      plan: "pro",
      month: "2026-03",
    });
  });

  it("returns count 0 for authenticated key with no usage this month", async () => {
    vi.mocked(isProKey).mockReturnValue(true);
    vi.mocked(isValidKey).mockReturnValue(true);
    vi.mocked(getKeyInfo).mockReturnValue({
      key: "test-key", tier: "pro", email: "test@docfast.dev", createdAt: new Date().toISOString(),
    } as any);
    vi.mocked(getUsageForKey).mockReturnValue({ count: 0, monthKey: "2026-03" });

    const res = await request(app)
      .get("/v1/usage/me")
      .set("X-API-Key", "test-key");

    expect(res.status).toBe(200);
    expect(res.body.used).toBe(0);
    expect(res.body.limit).toBe(5000);
    expect(res.body.plan).toBe("pro");
  });

  it("returns correct month string", async () => {
    vi.mocked(isValidKey).mockReturnValue(true);
    vi.mocked(isProKey).mockReturnValue(true);
    vi.mocked(getKeyInfo).mockReturnValue({
      key: "test-key", tier: "pro", email: "test@docfast.dev", createdAt: new Date().toISOString(),
    } as any);
    vi.mocked(getUsageForKey).mockReturnValue({ count: 5, monthKey: "2026-03" });

    const res = await request(app)
      .get("/v1/usage/me")
      .set("X-API-Key", "test-key");

    expect(res.body.month).toBe("2026-03");
  });

  it("returns demo plan for non-pro keys", async () => {
    vi.mocked(isProKey).mockReturnValue(false);
    vi.mocked(isValidKey).mockReturnValue(true);
    vi.mocked(getKeyInfo).mockReturnValue({
      key: "test-key", tier: "free", email: "test@docfast.dev", createdAt: new Date().toISOString(),
    } as any);
    vi.mocked(getUsageForKey).mockReturnValue({ count: 50, monthKey: "2026-03" });

    const res = await request(app)
      .get("/v1/usage/me")
      .set("X-API-Key", "test-key");

    expect(res.status).toBe(200);
    expect(res.body.plan).toBe("demo");
    expect(res.body.limit).toBe(100);
    expect(res.body.used).toBe(50);
  });
});