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

// Mock infrastructure
vi.mock('../src/services/prisma', () => ({
    prisma: {
        payment: { findFirst: vi.fn(), update: vi.fn(), create: vi.fn() },
        enrollment: { create: vi.fn(), findFirst: vi.fn() },
        organization: { findUnique: vi.fn() },
    },
}));

vi.mock('../src/services/queue', () => ({
    scheduleEmail: vi.fn(),
    whatsappQueue: { add: vi.fn() },
    notificationQueue: { add: vi.fn() },
}));

import { prisma } from '../src/services/prisma';

// ─── Webhook payload normalization ────────────────────────────────────────────

describe('Payment webhook — payload parsing', () => {
    beforeEach(() => vi.clearAllMocks());

    it('Wave: extracts sessionId from client_reference', () => {
        const payload = { id: 'sess_123', status: 'complete', client_reference: 'sess_123' };
        const sessionId = payload.client_reference ?? payload.id;
        const isSuccess = payload.status === 'complete';
        expect(sessionId).toBe('sess_123');
        expect(isSuccess).toBe(true);
    });

    it('Wave: marks failed payment as FAILED', () => {
        const payload = { id: 'sess_456', status: 'failed', client_reference: 'sess_456' };
        const isSuccess = payload.status === 'complete';
        expect(isSuccess).toBe(false);
    });

    it('Orange Money: extracts sessionId from reference', () => {
        const payload = { status: 'SUCCESS', txnid: 'om_789', reference: 'om_789' };
        const sessionId = payload.reference ?? payload.txnid;
        const isSuccess = payload.status === 'SUCCESS';
        expect(sessionId).toBe('om_789');
        expect(isSuccess).toBe(true);
    });

    it('Orange Money: marks FAILED status as not success', () => {
        const payload = { status: 'FAILED', txnid: 'om_999', reference: 'om_999' };
        const isSuccess = payload.status === 'SUCCESS';
        expect(isSuccess).toBe(false);
    });
});

// ─── Payment state transitions ────────────────────────────────────────────────

describe('Payment — state machine', () => {
    it('PENDING → COMPLETED on successful webhook', () => {
        const payment = { id: 'pay_1', status: 'PENDING', userId: 'user_1', trackId: 'track_1' };
        const updated = { ...payment, status: 'COMPLETED' };
        expect(updated.status).toBe('COMPLETED');
    });

    it('PENDING → FAILED on failed webhook', () => {
        const payment = { id: 'pay_2', status: 'PENDING' };
        const updated = { ...payment, status: 'FAILED' };
        expect(updated.status).toBe('FAILED');
    });

    it('does not re-process already COMPLETED payment', () => {
        const payment = { status: 'COMPLETED' };
        // Guard: if payment is already COMPLETED, skip
        const shouldProcess = payment.status === 'PENDING';
        expect(shouldProcess).toBe(false);
    });
});

// ─── Enrollment creation logic ────────────────────────────────────────────────

describe('Payment — auto enrollment on success', () => {
    beforeEach(() => vi.clearAllMocks());

    it('creates enrollment when payment succeeds and userId + trackId exist', async () => {
        const paymentData = {
            id: 'pay_1',
            status: 'PENDING',
            userId: 'user_1',
            trackId: 'track_1',
            organizationId: 'org_1',
        };

        (prisma.payment.findFirst as ReturnType<typeof vi.fn>).mockResolvedValue(paymentData);
        (prisma.payment.update as ReturnType<typeof vi.fn>).mockResolvedValue({ ...paymentData, status: 'COMPLETED' });
        (prisma.enrollment.findFirst as ReturnType<typeof vi.fn>).mockResolvedValue(null);
        (prisma.enrollment.create as ReturnType<typeof vi.fn>).mockResolvedValue({ id: 'enroll_1' });

        // Simulate webhook handler logic
        const payment = await prisma.payment.findFirst({ where: { paymentSessionId: 'sess_1' } as any });
        expect(payment).not.toBeNull();

        await prisma.payment.update({ where: { id: payment!.id }, data: { status: 'COMPLETED' } as any });

        const existingEnrollment = await prisma.enrollment.findFirst({ where: { userId: payment!.userId } as any });
        if (!existingEnrollment && payment!.userId && payment!.trackId) {
            await prisma.enrollment.create({ data: { userId: payment!.userId } as any });
        }

        expect(prisma.enrollment.create).toHaveBeenCalledTimes(1);
    });

    it('skips enrollment creation when userId is missing', async () => {
        const paymentData = { id: 'pay_2', status: 'PENDING', userId: null, trackId: 'track_1' };
        (prisma.payment.findFirst as ReturnType<typeof vi.fn>).mockResolvedValue(paymentData);

        // Simulate: no userId → no enrollment
        const payment = await prisma.payment.findFirst({ where: {} as any });
        const shouldEnroll = !!payment?.userId && !!payment?.trackId;
        expect(shouldEnroll).toBe(false);
        expect(prisma.enrollment.create).not.toHaveBeenCalled();
    });

    it('skips enrollment if one already exists', async () => {
        const paymentData = { id: 'pay_3', status: 'PENDING', userId: 'user_2', trackId: 'track_1' };
        (prisma.payment.findFirst as ReturnType<typeof vi.fn>).mockResolvedValue(paymentData);
        (prisma.enrollment.findFirst as ReturnType<typeof vi.fn>).mockResolvedValue({ id: 'existing_enroll' });

        const payment = await prisma.payment.findFirst({ where: {} as any });
        const existingEnrollment = await prisma.enrollment.findFirst({ where: {} as any });
        const shouldCreate = !existingEnrollment;
        expect(shouldCreate).toBe(false);
        expect(prisma.enrollment.create).not.toHaveBeenCalled();
    });
});

// ─── Provider amount validation ───────────────────────────────────────────────

describe('Payment — provider validation', () => {
    it('rejects amount below minimum (1 FCFA)', () => {
        const amount = 0;
        const isValid = amount > 0;
        expect(isValid).toBe(false);
    });

    it('accepts valid FCFA amount', () => {
        const amount = 20000;
        const isValid = amount > 0;
        expect(isValid).toBe(true);
    });

    it('validates supported providers', () => {
        const SUPPORTED = ['WAVE', 'ORANGE_MONEY'];
        expect(SUPPORTED.includes('WAVE')).toBe(true);
        expect(SUPPORTED.includes('STRIPE')).toBe(false); // deprecated
    });
});