const { Pool } = require('pg');
const { DATABASE_URL } = require('./config');

const pool = new Pool({
    connectionString: DATABASE_URL
});

const initDB = async () => {
    try {
        await pool.query(`SET TIME ZONE 'America/Sao_Paulo';`);

        await pool.query(`
            CREATE TABLE IF NOT EXISTS orders (
                id SERIAL PRIMARY KEY,
                cliente_nome VARCHAR(255),
                data_pedido VARCHAR(50),
                data_pedido_date DATE,
                valor_pedido NUMERIC(10, 2),
                produto_id VARCHAR(100),
                produto_descricao TEXT,
                quantidade INTEGER,
                valor_unitario NUMERIC(10, 5),
                created_at TIMESTAMPTZ DEFAULT CURRENT_TIMESTAMP
            );
        `);

        await pool.query(`ALTER TABLE orders ADD COLUMN IF NOT EXISTS pedido_id VARCHAR(100);`).catch(() => {});
        await pool.query(`ALTER TABLE orders ADD COLUMN IF NOT EXISTS cliente_fone VARCHAR(50);`).catch(() => {});
        await pool.query(`ALTER TABLE orders ADD COLUMN IF NOT EXISTS data_pedido_date DATE;`).catch(() => {});

        await pool.query(`
            ALTER TABLE orders
            ALTER COLUMN created_at TYPE TIMESTAMPTZ USING created_at AT TIME ZONE 'America/Sao_Paulo',
            ALTER COLUMN created_at SET DEFAULT CURRENT_TIMESTAMP;
        `).catch(() => {});

        await pool.query(`
            UPDATE orders
            SET data_pedido_date = CASE
                WHEN data_pedido ~ '^\\d{4}[-/]\\d{1,2}[-/]\\d{1,2}' THEN to_date(replace(left(data_pedido, 10), '/', '-'), 'YYYY-MM-DD')
                WHEN data_pedido ~ '^\\d{1,2}[-/]\\d{1,2}[-/]\\d{4}' THEN to_date(replace(left(data_pedido, 10), '/', '-'), 'DD-MM-YYYY')
                ELSE NULL
            END
            WHERE data_pedido_date IS NULL
              AND data_pedido IS NOT NULL
              AND data_pedido != '';
        `).catch(err => {
            console.error('Notice: Could not backfill normalized order dates:', err.message);
        });

        await pool.query(`CREATE UNIQUE INDEX IF NOT EXISTS unique_order_product ON orders (pedido_id, produto_id);`).catch(err => {
            console.error('Notice: Could not create unique index (might already exist or there are duplicates):', err.message);
        });

        await pool.query(`
            CREATE TABLE IF NOT EXISTS stock (
                produto_id VARCHAR(100) PRIMARY KEY,
                nome TEXT,
                saldo INTEGER DEFAULT 0,
                delta_estoque INTEGER DEFAULT 0,
                updated_at TIMESTAMPTZ DEFAULT CURRENT_TIMESTAMP
            );
        `);

        await pool.query(`
            ALTER TABLE stock
            ALTER COLUMN updated_at TYPE TIMESTAMPTZ USING updated_at AT TIME ZONE 'America/Sao_Paulo',
            ALTER COLUMN updated_at SET DEFAULT CURRENT_TIMESTAMP;
        `).catch(() => {});

        await pool.query(`
            CREATE TABLE IF NOT EXISTS stock_campaign_queue (
                id SERIAL PRIMARY KEY,
                base_product_name TEXT NOT NULL,
                produto_id VARCHAR(100) NOT NULL,
                nome TEXT NOT NULL,
                saldo INTEGER DEFAULT 0,
                delta_estoque INTEGER DEFAULT 0,
                status VARCHAR(20) DEFAULT 'pending',
                attempts INTEGER DEFAULT 0,
                last_error TEXT,
                created_at TIMESTAMPTZ DEFAULT CURRENT_TIMESTAMP,
                updated_at TIMESTAMPTZ DEFAULT CURRENT_TIMESTAMP,
                sent_at TIMESTAMPTZ
            );
        `);

        await pool.query(`
            ALTER TABLE stock_campaign_queue
            ALTER COLUMN created_at TYPE TIMESTAMPTZ USING created_at AT TIME ZONE 'America/Sao_Paulo',
            ALTER COLUMN created_at SET DEFAULT CURRENT_TIMESTAMP,
            ALTER COLUMN updated_at TYPE TIMESTAMPTZ USING updated_at AT TIME ZONE 'America/Sao_Paulo',
            ALTER COLUMN updated_at SET DEFAULT CURRENT_TIMESTAMP,
            ALTER COLUMN sent_at TYPE TIMESTAMPTZ USING sent_at AT TIME ZONE 'America/Sao_Paulo';
        `).catch(() => {});

        await pool.query(`
            UPDATE stock_campaign_queue
            SET base_product_name = TRIM(regexp_replace(
                base_product_name,
                '\\s+-\\s+(?:(?:PP|P|M|G|GG|XG|XGG|EG|EGG|EXG|U|UNICO|ÚNICO|\\d{2})(?:/(?:PP|P|M|G|GG|XG|XGG|EG|EGG|EXG|U|UNICO|ÚNICO|\\d{2}))*)$',
                '',
                'i'
            ))
            WHERE status IN ('pending', 'failed', 'processing')
              AND base_product_name ~* '\\s+-\\s+(?:(?:PP|P|M|G|GG|XG|XGG|EG|EGG|EXG|U|UNICO|ÚNICO|\\d{2})(?:/(?:PP|P|M|G|GG|XG|XGG|EG|EGG|EXG|U|UNICO|ÚNICO|\\d{2}))*)$';
        `).catch(err => {
            console.error('Notice: Could not normalize queued campaign product names:', err.message);
        });

        await pool.query(`
            UPDATE stock_campaign_queue
            SET base_product_name = nome
            WHERE status IN ('pending', 'failed', 'processing')
              AND nome ILIKE 'ETIQUETA%'
              AND base_product_name != nome;
        `).catch(err => {
            console.error('Notice: Could not restore queued etiqueta product names:', err.message);
        });

        await pool.query(`CREATE INDEX IF NOT EXISTS idx_stock_campaign_queue_status ON stock_campaign_queue (status);`);
        await pool.query(`CREATE INDEX IF NOT EXISTS idx_orders_cliente_fone ON orders (cliente_fone);`);
        await pool.query(`CREATE INDEX IF NOT EXISTS idx_orders_produto_id ON orders (produto_id);`);
        await pool.query(`CREATE INDEX IF NOT EXISTS idx_orders_data_pedido_date ON orders (data_pedido_date);`);

        console.log('Database initialized successfully.');
    } catch (err) {
        console.error('Failed to initialize database:', err);
        throw err;
    }
};

module.exports = {
    pool,
    initDB
};