const { pool } = require('../db');
const { normalizeStockPayload } = require('../mappers/stockMapper');
const { enqueueStockCampaignItem } = require('./campaignService');

const CAMPAIGN_DELTA_THRESHOLD = 100;

const listStock = async () => {
    const result = await pool.query('SELECT * FROM stock');
    return result.rows;
};

const upsertStockItems = async (payload) => {
    const client = await pool.connect();

    try {
        await client.query('BEGIN');

        const insertQuery = `
            INSERT INTO stock (produto_id, nome, saldo, delta_estoque)
            VALUES ($1, $2, $3, $4)
            ON CONFLICT (produto_id) DO UPDATE SET
                nome = EXCLUDED.nome,
                saldo = EXCLUDED.saldo,
                delta_estoque = EXCLUDED.delta_estoque,
                updated_at = CURRENT_TIMESTAMP
        `;

        for (const rawItem of payload) {
            const item = normalizeStockPayload(rawItem);
            if (!item.produtoId) continue;

            await client.query(insertQuery, [
                item.produtoId,
                item.nome,
                item.saldo,
                item.deltaEstoque
            ]);

            if (item.deltaEstoque >= CAMPAIGN_DELTA_THRESHOLD) {
                await enqueueStockCampaignItem(client, item);
            }
        }

        await client.query('COMMIT');
    } catch (error) {
        await client.query('ROLLBACK');
        throw error;
    } finally {
        client.release();
    }
};

module.exports = {
    listStock,
    upsertStockItems
};