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

// Override the global setup.ts mock for keys — we need the REAL implementation
vi.unmock("../services/keys.js");

// Keep db mocked (setup.ts already does this, but be explicit about our mock)
vi.mock("../services/db.js", () => ({
  default: { query: vi.fn(), connect: vi.fn(), on: vi.fn(), end: vi.fn() },
  pool: { query: vi.fn(), connect: vi.fn(), on: vi.fn(), end: vi.fn() },
  queryWithRetry: vi.fn().mockResolvedValue({ rows: [], rowCount: 0 }),
  connectWithRetry: vi.fn().mockResolvedValue(undefined),
  initDatabase: vi.fn().mockResolvedValue(undefined),
  cleanupStaleData: vi.fn(),
  isTransientError: vi.fn(),
}));

vi.mock("../services/logger.js", () => ({
  default: { info: vi.fn(), error: vi.fn(), warn: vi.fn(), debug: vi.fn() },
}));

import { queryWithRetry } from "../services/db.js";
import { 
  createFreeKey, 
  updateKeyEmail, 
  updateEmailByCustomer, 
  loadKeys,
  getAllKeys
} from "../services/keys.js";

const mockQuery = vi.mocked(queryWithRetry);

describe("keys.ts cache-hit coverage", () => {
  beforeEach(() => {
    vi.clearAllMocks();
    // Reset cache by loading empty state
    mockQuery.mockResolvedValue({ rows: [], rowCount: 0 } as any);
  });

  it("createFreeKey returns existing key when email has a free key in cache", async () => {
    // Pre-populate cache with a free key
    mockQuery.mockResolvedValueOnce({
      rows: [
        {
          key: "df_free_existing123",
          tier: "free",
          email: "existing@example.com",
          created_at: "2026-01-01T00:00:00.000Z",
          stripe_customer_id: null,
        },
      ],
      rowCount: 1,
    } as any);
    
    // Load the cache with our test data
    await loadKeys();
    
    // Clear mock calls from loadKeys
    mockQuery.mockClear();
    
    // Now call createFreeKey with the same email - should hit cache and return existing
    const result = await createFreeKey("existing@example.com");
    
    expect(result.key).toBe("df_free_existing123");
    expect(result.tier).toBe("free");
    expect(result.email).toBe("existing@example.com");
    
    // Should NOT have called the database INSERT (cache hit path)
    const insertCalls = mockQuery.mock.calls.filter((call) =>
      (call[0] as string).includes("INSERT")
    );
    expect(insertCalls).toHaveLength(0);
  });

  it("updateKeyEmail updates cache and DB when key is found in cache", async () => {
    // Pre-populate cache with a key
    mockQuery.mockResolvedValueOnce({
      rows: [
        {
          key: "df_pro_test123",
          tier: "pro",
          email: "old@example.com",
          created_at: "2026-01-01T00:00:00.000Z",
          stripe_customer_id: "cus_test123",
        },
      ],
      rowCount: 1,
    } as any);
    
    // Load the cache
    await loadKeys();
    
    // Clear mock calls
    mockQuery.mockClear();
    
    // Mock the UPDATE query
    mockQuery.mockResolvedValueOnce({ rows: [], rowCount: 1 } as any);
    
    // Call updateKeyEmail - should hit cache
    const result = await updateKeyEmail("df_pro_test123", "new@example.com");
    
    expect(result).toBe(true);
    
    // Should have called the UPDATE query
    expect(mockQuery).toHaveBeenCalledWith(
      "UPDATE api_keys SET email = $1 WHERE key = $2",
      ["new@example.com", "df_pro_test123"]
    );
    
    // Verify cache was updated
    const keys = getAllKeys();
    const updatedKey = keys.find(k => k.key === "df_pro_test123");
    expect(updatedKey?.email).toBe("new@example.com");
  });

  it("updateEmailByCustomer updates cache and DB when stripeCustomerId is found in cache", async () => {
    // Pre-populate cache with a key that has stripeCustomerId
    mockQuery.mockResolvedValueOnce({
      rows: [
        {
          key: "df_pro_customer123",
          tier: "pro",
          email: "customer@example.com",
          created_at: "2026-01-01T00:00:00.000Z",
          stripe_customer_id: "cus_customer123",
        },
      ],
      rowCount: 1,
    } as any);
    
    // Load the cache
    await loadKeys();
    
    // Clear mock calls
    mockQuery.mockClear();
    
    // Mock the UPDATE query
    mockQuery.mockResolvedValueOnce({ rows: [], rowCount: 1 } as any);
    
    // Call updateEmailByCustomer - should hit cache
    const result = await updateEmailByCustomer("cus_customer123", "newemail@example.com");
    
    expect(result).toBe(true);
    
    // Should have called the UPDATE query
    expect(mockQuery).toHaveBeenCalledWith(
      "UPDATE api_keys SET email = $1 WHERE stripe_customer_id = $2",
      ["newemail@example.com", "cus_customer123"]
    );
    
    // Verify cache was updated
    const keys = getAllKeys();
    const updatedKey = keys.find(k => k.stripeCustomerId === "cus_customer123");
    expect(updatedKey?.email).toBe("newemail@example.com");
  });
});