const assert = require('node:assert/strict');
const test = require('node:test');

const withCampaignService = async (queryHandler, callback) => {
    const dbPath = require.resolve('../db');
    const servicePath = require.resolve('../services/campaignService');
    const originalDbCache = require.cache[dbPath];
    const originalServiceCache = require.cache[servicePath];
    const queries = [];

    delete require.cache[servicePath];
    require.cache[dbPath] = {
        id: dbPath,
        filename: dbPath,
        loaded: true,
        exports: {
            pool: {
                query: async (sql, params = []) => {
                    queries.push({ sql, params });
                    return queryHandler(sql, params);
                }
            }
        }
    };

    try {
        const service = require('../services/campaignService');
        return await callback(service, queries);
    } finally {
        delete require.cache[servicePath];
        if (originalServiceCache) {
            require.cache[servicePath] = originalServiceCache;
        }
        if (originalDbCache) {
            require.cache[dbPath] = originalDbCache;
        } else {
            delete require.cache[dbPath];
        }
    }
};

test('getTopClientsForCampaign returns top clients for an explicit date range', async () => {
    await withCampaignService(async () => ({
        rows: [
            {
                nome: 'Cliente A',
                fone: '5516999999901',
                total_gasto: '1234.50',
                total_comprado: '18',
                total_pedidos: 4,
                ultima_compra: '2026-07-27',
                telefones: ['5516999999901', '5516999999902']
            }
        ]
    }), async ({ getTopClientsForCampaign }, queries) => {
        const result = await getTopClientsForCampaign({
            start: '2026-06-28',
            end: '2026-07-27',
            limit: '1000'
        });

        assert.equal(result.start, '2026-06-28');
        assert.equal(result.end, '2026-07-27');
        assert.equal(result.limit, 1000);
        assert.equal(result.count, 1);
        assert.deepEqual(result.customers[0], {
            nome: 'Cliente A',
            fone: '5516999999901',
            total_gasto: 1234.5,
            total_comprado: 18,
            total_pedidos: 4,
            ultima_compra: '2026-07-27',
            telefones: ['5516999999901', '5516999999902']
        });

        assert.equal(queries.length, 1);
        assert.deepEqual(queries[0].params, ['2026-06-28', '2026-07-27', 1000]);
        assert.match(queries[0].sql, /GROUP BY whatsapp_phone/);
        assert.doesNotMatch(queries[0].sql, /GROUP BY COALESCE\(canonical_customer_name, whatsapp_phone\)/);
        assert.match(queries[0].sql, /ARRAY_AGG\(DISTINCT whatsapp_phone\)/);
        assert.match(queries[0].sql, /ORDER BY total_gasto DESC/);
    });
});

test('getTopClientsForCampaign derives an inclusive 30 day range from the end date', async () => {
    await withCampaignService(async () => ({ rows: [] }), async ({ getTopClientsForCampaign }, queries) => {
        const result = await getTopClientsForCampaign({
            days: '30',
            end: '2026-07-27'
        });

        assert.equal(result.start, '2026-06-28');
        assert.equal(result.end, '2026-07-27');
        assert.equal(result.limit, 1000);
        assert.deepEqual(queries[0].params, ['2026-06-28', '2026-07-27', 1000]);
    });
});

test('getTopClientsForCampaign normalizes phones and groups one row per WhatsApp number', async () => {
    await withCampaignService(async () => ({ rows: [] }), async ({ getTopClientsForCampaign }, queries) => {
        await getTopClientsForCampaign({
            days: '30',
            end: '2026-07-27'
        });

        assert.match(queries[0].sql, /regexp_replace\(COALESCE\(cliente_fone, ''\), '\\D', '', 'g'\)/);
        assert.match(queries[0].sql, /WHEN length\(/);
        assert.match(queries[0].sql, /'55' \|\|/);
        assert.match(queries[0].sql, /GROUP BY whatsapp_phone/);
    });
});