/**
 * Fiat Payment Services — Unit Tests
 * Tests for Alipay, WeChat Pay, and PayPal service helper functions.
 * All external API calls are mocked; no real credentials required.
 */

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

// ─── Mock DB ──────────────────────────────────────────────────────────────────
vi.mock("./db", () => ({
  getDb: vi.fn().mockResolvedValue(null),
}));

vi.mock("./tokenDistributionService", () => ({
  creditXic: vi.fn().mockResolvedValue({ success: true, alreadyProcessed: false }),
  calcXicAmount: vi.fn().mockImplementation((usd: number) => Math.floor(usd / 0.02)),
}));

// ─── Alipay Tests ─────────────────────────────────────────────────────────────
describe("alipayService", () => {
  it("generateAlipayOrderId returns ALIPAY- prefixed string", async () => {
    const { generateAlipayOrderId } = await import("./services/alipayService");
    const id = generateAlipayOrderId();
    expect(id).toMatch(/^ALIPAY-\d+-[A-Z0-9]+$/);
  });

  it("generateAlipayOrderId is unique on each call", async () => {
    const { generateAlipayOrderId } = await import("./services/alipayService");
    const ids = new Set(Array.from({ length: 100 }, () => generateAlipayOrderId()));
    expect(ids.size).toBe(100);
  });

  it("createAlipayOrder returns error when DB unavailable", async () => {
    const { createAlipayOrder } = await import("./services/alipayService");
    const result = await createAlipayOrder({
      orderId: "ALIPAY-TEST-001",
      subject: "Test",
      totalAmount: "100.00",
      xicReceiveAddress: "0x1234567890abcdef1234567890abcdef12345678",
    });
    // DB is mocked to return null, so should fail gracefully
    expect(result.success).toBe(false);
    expect(result.error).toBeDefined();
  });
});

// ─── WeChat Pay Tests ─────────────────────────────────────────────────────────
describe("wechatPayService", () => {
  it("generateWechatOrderId returns WECHAT- prefixed string", async () => {
    const { generateWechatOrderId } = await import("./services/wechatPayService");
    const id = generateWechatOrderId();
    expect(id).toMatch(/^WECHAT-\d+-[A-Z0-9]+$/);
  });

  it("generateWechatOrderId is unique on each call", async () => {
    const { generateWechatOrderId } = await import("./services/wechatPayService");
    const ids = new Set(Array.from({ length: 100 }, () => generateWechatOrderId()));
    expect(ids.size).toBe(100);
  });

  it("createWechatOrder returns error when DB unavailable", async () => {
    const { createWechatOrder } = await import("./services/wechatPayService");
    const result = await createWechatOrder({
      orderId: "WECHAT-TEST-001",
      description: "Test",
      totalFen: 10000,
      xicReceiveAddress: "0x1234567890abcdef1234567890abcdef12345678",
      payType: "NATIVE",
    });
    expect(result.success).toBe(false);
    expect(result.error).toBeDefined();
  });
});

// ─── PayPal Tests ─────────────────────────────────────────────────────────────
describe("paypalService", () => {
  it("generatePaypalOrderId returns PAYPAL- prefixed string", async () => {
    const { generatePaypalOrderId } = await import("./services/paypalService");
    const id = generatePaypalOrderId();
    expect(id).toMatch(/^PAYPAL-\d+-[A-Z0-9]+$/);
  });

  it("generatePaypalOrderId is unique on each call", async () => {
    const { generatePaypalOrderId } = await import("./services/paypalService");
    const ids = new Set(Array.from({ length: 100 }, () => generatePaypalOrderId()));
    expect(ids.size).toBe(100);
  });

  it("createPaypalOrder returns error when DB unavailable", async () => {
    const { createPaypalOrder } = await import("./services/paypalService");
    const result = await createPaypalOrder({
      orderId: "PAYPAL-TEST-001",
      usdAmount: "100.00",
      xicReceiveAddress: "0x1234567890abcdef1234567890abcdef12345678",
    });
    expect(result.success).toBe(false);
    expect(result.error).toBeDefined();
  });
});

// ─── tokenDistributionService.calcXicAmount ───────────────────────────────────
describe("calcXicAmount (mocked)", () => {
  it("calculates XIC correctly at $0.02/XIC", async () => {
    const { calcXicAmount } = await import("./tokenDistributionService");
    expect(calcXicAmount(100)).toBe(5000);
    expect(calcXicAmount(1000)).toBe(50000);
    expect(calcXicAmount(0.02)).toBe(1);
  });
});

// ─── Order ID Format Validation ───────────────────────────────────────────────
describe("Order ID format", () => {
  it("all order IDs have correct prefix format", async () => {
    const { generateAlipayOrderId } = await import("./services/alipayService");
    const { generateWechatOrderId } = await import("./services/wechatPayService");
    const { generatePaypalOrderId } = await import("./services/paypalService");

    const alipay = generateAlipayOrderId();
    const wechat = generateWechatOrderId();
    const paypal = generatePaypalOrderId();

    expect(alipay.startsWith("ALIPAY-")).toBe(true);
    expect(wechat.startsWith("WECHAT-")).toBe(true);
    expect(paypal.startsWith("PAYPAL-")).toBe(true);

    // All should be under 64 chars (DB constraint)
    expect(alipay.length).toBeLessThanOrEqual(64);
    expect(wechat.length).toBeLessThanOrEqual(64);
    expect(paypal.length).toBeLessThanOrEqual(64);
  });
});