import { describe, it, expect, beforeEach, vi } from "vitest";
import * as db from "./db";
import { nanoid } from "nanoid";

// Mock database functions
vi.mock("./db", () => ({
  getDb: vi.fn(),
  getUserById: vi.fn(),
  updateWalletBalance: vi.fn(),
  createWalletTransaction: vi.fn(),
  createVtuTransaction: vi.fn(),
  getVtuTransactionByReference: vi.fn(),
  updateVtuTransaction: vi.fn(),
  createGiftCardTransaction: vi.fn(),
  createSupportTicket: vi.fn(),
  createFraudRule: vi.fn(),
  getFraudRules: vi.fn(),
  createFraudAlert: vi.fn(),
  createAuditLog: vi.fn(),
}));

describe("VTU Service", () => {
  it("should create a VTU transaction with valid input", async () => {
    const mockTransaction = {
      id: 1,
      userId: 1,
      providerId: 1,
      type: "airtime" as const,
      phoneNumber: "08012345678",
      amount: "500",
      status: "pending" as const,
      reference: "VTU-123456",
      createdAt: new Date(),
      updatedAt: new Date(),
    };

    vi.mocked(db.createVtuTransaction).mockResolvedValue({ insertId: 1 } as any);

    const result = await db.createVtuTransaction({
      userId: 1,
      providerId: 1,
      type: "airtime",
      phoneNumber: "08012345678",
      amount: "500",
      status: "pending",
      reference: "VTU-123456",
    });

    expect(result).toBeDefined();
    expect(db.createVtuTransaction).toHaveBeenCalledWith(
      expect.objectContaining({
        phoneNumber: "08012345678",
        amount: "500",
      })
    );
  });

  it("should retrieve VTU transaction by reference", async () => {
    const mockTransaction = {
      id: 1,
      userId: 1,
      providerId: 1,
      type: "airtime" as const,
      phoneNumber: "08012345678",
      amount: "500",
      status: "success" as const,
      reference: "VTU-123456",
      providerReference: "PROV-789",
      receipt: "Receipt data",
      errorMessage: null,
      createdAt: new Date(),
      updatedAt: new Date(),
    };

    vi.mocked(db.getVtuTransactionByReference).mockResolvedValue(mockTransaction);

    const result = await db.getVtuTransactionByReference("VTU-123456");

    expect(result).toEqual(mockTransaction);
    expect(db.getVtuTransactionByReference).toHaveBeenCalledWith("VTU-123456");
  });

  it("should update VTU transaction status", async () => {
    vi.mocked(db.updateVtuTransaction).mockResolvedValue(true);

    const result = await db.updateVtuTransaction(1, { status: "success" });

    expect(result).toBe(true);
    expect(db.updateVtuTransaction).toHaveBeenCalledWith(1, { status: "success" });
  });
});

describe("Gift Card Service", () => {
  it("should create a gift card transaction", async () => {
    vi.mocked(db.createGiftCardTransaction).mockResolvedValue({ insertId: 1 } as any);

    const result = await db.createGiftCardTransaction({
      userId: 1,
      denominationId: 1,
      quantity: 2,
      totalAmount: "5000",
      status: "pending",
      reference: "GC-123456",
    });

    expect(result).toBeDefined();
    expect(db.createGiftCardTransaction).toHaveBeenCalledWith(
      expect.objectContaining({
        quantity: 2,
        totalAmount: "5000",
      })
    );
  });
});

describe("Wallet Management", () => {
  it("should update wallet balance", async () => {
    vi.mocked(db.updateWalletBalance).mockResolvedValue(true);

    const result = await db.updateWalletBalance(1, "10000.00");

    expect(result).toBe(true);
    expect(db.updateWalletBalance).toHaveBeenCalledWith(1, "10000.00");
  });

  it("should create wallet transaction record", async () => {
    vi.mocked(db.createWalletTransaction).mockResolvedValue({ insertId: 1 } as any);

    const result = await db.createWalletTransaction({
      userId: 1,
      type: "deposit",
      amount: "5000",
      balanceBefore: "5000",
      balanceAfter: "10000",
      status: "success",
      reference: "WAL-123456",
      description: "Wallet funding",
    });

    expect(result).toBeDefined();
    expect(db.createWalletTransaction).toHaveBeenCalled();
  });
});

describe("Support Ticket Service", () => {
  it("should create a support ticket", async () => {
    vi.mocked(db.createSupportTicket).mockResolvedValue({ insertId: 1 } as any);

    const result = await db.createSupportTicket({
      userId: 1,
      ticketNumber: "TKT-123456",
      subject: "Issue with VTU",
      category: "vtu",
      description: "Unable to purchase airtime",
      priority: "high",
      status: "open",
    });

    expect(result).toBeDefined();
    expect(db.createSupportTicket).toHaveBeenCalledWith(
      expect.objectContaining({
        subject: "Issue with VTU",
        category: "vtu",
      })
    );
  });
});

describe("Fraud Detection", () => {
  it("should create a fraud rule", async () => {
    vi.mocked(db.createFraudRule).mockResolvedValue({ insertId: 1 } as any);

    const result = await db.createFraudRule({
      name: "High Amount Transaction",
      description: "Flag transactions above 100,000",
      ruleType: "amount_threshold",
      condition: "amount > 100000",
      action: "alert",
      severity: "high",
      createdBy: 1,
    });

    expect(result).toBeDefined();
    expect(db.createFraudRule).toHaveBeenCalledWith(
      expect.objectContaining({
        ruleType: "amount_threshold",
        action: "alert",
      })
    );
  });

  it("should create a fraud alert", async () => {
    vi.mocked(db.createFraudAlert).mockResolvedValue({ insertId: 1 } as any);

    const result = await db.createFraudAlert({
      userId: 1,
      transactionId: 1,
      ruleId: 1,
      ruleName: "High Amount Transaction",
      severity: "high",
      transactionAmount: "150000",
      userDetails: JSON.stringify({ name: "John Doe", email: "john@example.com" }),
      status: "new",
    });

    expect(result).toBeDefined();
    expect(db.createFraudAlert).toHaveBeenCalledWith(
      expect.objectContaining({
        ruleName: "High Amount Transaction",
        severity: "high",
      })
    );
  });

  it("should create audit log for admin actions", async () => {
    vi.mocked(db.createAuditLog).mockResolvedValue({ insertId: 1 } as any);

    const result = await db.createAuditLog({
      adminId: 1,
      action: "CREATE_FRAUD_RULE",
      resourceType: "fraud_rule",
      details: "Created new fraud rule",
    });

    expect(result).toBeDefined();
    expect(db.createAuditLog).toHaveBeenCalledWith(
      expect.objectContaining({
        action: "CREATE_FRAUD_RULE",
      })
    );
  });
});

describe("RBAC Authorization", () => {
  it("should verify admin role requirement", () => {
    const adminUser = { id: 1, role: "admin" as const };
    const regularUser = { id: 2, role: "user" as const };

    expect(adminUser.role === "admin").toBe(true);
    expect(regularUser.role === "admin").toBe(false);
  });

  it("should prevent non-admin access to admin procedures", () => {
    const user = { id: 1, role: "user" as const };
    const isAdmin = user.role === "admin";

    expect(isAdmin).toBe(false);
  });
});

describe("Transaction Reference Generation", () => {
  it("should generate unique transaction references", () => {
    const ref1 = `VTU-${Date.now()}-${nanoid(8)}`;
    const ref2 = `VTU-${Date.now()}-${nanoid(8)}`;

    expect(ref1).toMatch(/^VTU-\d+-[a-zA-Z0-9]{8}$/);
    expect(ref2).toMatch(/^VTU-\d+-[a-zA-Z0-9]{8}$/);
    expect(ref1).not.toBe(ref2);
  });

  it("should generate unique ticket numbers", () => {
    const ticket1 = `TKT-${Date.now()}-${nanoid(6)}`;
    const ticket2 = `TKT-${Date.now()}-${nanoid(6)}`;

    expect(ticket1).toMatch(/^TKT-\d+-[a-zA-Z0-9]{6}$/);
    expect(ticket2).toMatch(/^TKT-\d+-[a-zA-Z0-9]{6}$/);
  });
});