/**
 * Batch payout dispatch tests (Phase 0.3).
 *
 * transfer_split sends ONE on-chain tx to many destinations, so every payout row in a
 * batch shares that tx_hash. These tests guard:
 *  - the whole batch is marked completed with the shared tx_hash in one transaction
 *    (no row stranded mid-batch by a unique-index collision), and
 *  - an ambiguous batch failure is marked 'needs_review' (NOT 'failed'), so the retry
 *    service won't re-send and double-pay.
 */

const GameModeManager = require('../src/game/gameModeManager');

const createMockDb = () => {
    const mockClient = { query: jest.fn().mockResolvedValue({ rows: [] }) };
    return {
        query: jest.fn().mockResolvedValue({ rows: [] }),
        withTransaction: jest.fn().mockImplementation(async (cb) => cb(mockClient)),
        _mockClient: mockClient
    };
};

const createMockPaymentConfig = () => ({
    getConfig: () => ({
        paymentsEnabled: true,
        currency: { symbol: 'WOW', decimals: 11 },
        modes: {
            direct: { enabled: true, price: 100000000000n },
            credits: { enabled: true, creditsPerGame: 1, packages: [{ id: 'small', credits: 10, price: '500000000000', bonus: 0 }] }
        },
        payouts: {
            rules: {
                direct: { enabled: true, multipliers: { escape: 2, escapeWithTreasure: 3 } },
                credits: { enabled: false, multipliers: { escape: 1.5, escapeWithTreasure: 2 }, baseValue: 50000000000n }
            }
        },
        preferences: { preferCreditsFirst: true },
        earlyEntry: { enabled: false }
    }),
    getLegacyGameMode: () => 'PAID_SINGLE',
    eventBus: { on: () => {} }
});

function buildGmm(walletService) {
    const db = createMockDb();
    const debugManager = { CONSOLE_LOGGING: false, getCurrentBlockHeight: () => 1 };
    const gmm = new GameModeManager(db, walletService, debugManager, createMockPaymentConfig());
    return { gmm, db };
}

const TWO_PENDING = [
    { id: 10, user_id: 1, game_id: 'g1', payout_address: 'addrA', amount: '200000000000', multiplier: 2, reason: 'escape' },
    { id: 11, user_id: 2, game_id: 'g2', payout_address: 'addrB', amount: '300000000000', multiplier: 3, reason: 'escape' }
];

describe('Batch payout dispatch', () => {
    test('marks the whole batch completed with the shared tx_hash in one transaction', async () => {
        const walletService = {
            processPayout: jest.fn(),
            processBatchPayout: jest.fn().mockResolvedValue({ tx_hash_list: ['txSHARED'], totalFee: 200 })
        };
        const { gmm, db } = buildGmm(walletService);

        // First withTransaction = gather: SELECT returns 2 pending rows, then UPDATE ... processing.
        db._mockClient.query
            .mockResolvedValueOnce({ rows: TWO_PENDING }) // SELECT ... FOR UPDATE SKIP LOCKED
            .mockResolvedValue({ rows: [] });             // everything else

        await gmm._processPendingPayouts();

        // The batch RPC was called once with both destinations.
        expect(walletService.processBatchPayout).toHaveBeenCalledTimes(1);
        expect(walletService.processBatchPayout.mock.calls[0][0]).toHaveLength(2);

        // The completion UPDATE set the shared tx_hash on the whole batch via id = ANY(...).
        const calls = db._mockClient.query.mock.calls.map(c => c[0]);
        const batchUpdate = calls.find(sql => /UPDATE payouts SET tx_hash/i.test(sql) && /id = ANY/i.test(sql));
        expect(batchUpdate).toBeDefined();
        expect(batchUpdate).toMatch(/status = 'completed'/);

        const batchUpdateCall = db._mockClient.query.mock.calls.find(c => /UPDATE payouts SET tx_hash/i.test(c[0]) && /id = ANY/i.test(c[0]));
        expect(batchUpdateCall[1][0]).toBe('txSHARED');     // tx_hash param
        expect(batchUpdateCall[1][3]).toEqual([10, 11]);    // ids array

        // Per-user stats incremented for each winner inside the same transaction (BIGINT, no float).
        const statUpdates = calls.filter(sql => /UPDATE users SET total_amount_won/i.test(sql));
        expect(statUpdates.length).toBe(2);
    });

    test('an ambiguous batch failure is marked needs_review, not failed', async () => {
        const walletService = {
            processPayout: jest.fn(),
            processBatchPayout: jest.fn().mockRejectedValue(new Error('RPC timeout'))
        };
        const { gmm, db } = buildGmm(walletService);

        db._mockClient.query
            .mockResolvedValueOnce({ rows: TWO_PENDING })
            .mockResolvedValue({ rows: [] });

        await gmm._processPendingPayouts();

        // Failure handling uses db.query (outside a transaction) to mark the batch needs_review.
        const failCall = db.query.mock.calls.find(c => /needs_review/i.test(c[0]));
        expect(failCall).toBeDefined();
        expect(failCall[0]).toMatch(/id = ANY/i);
        // Must NOT mark them 'failed' (which the retry service would auto-resend).
        const failedCall = db.query.mock.calls.find(c => /status = 'failed'/i.test(c[0]));
        expect(failedCall).toBeUndefined();
    });
});