#!/usr/bin/env node
// import_qbo_payment.js — Importiert ein spezifisches QBO Payment in die lokale DB
//
// Verwendung:
//   node import_qbo_payment.js <QBO_PAYMENT_ID>
//
// Beispiel:
//   node import_qbo_payment.js 20616
//
// Was passiert:
// 1. Payment aus QBO laden (inkl. LinkedTxn → verknüpfte Invoices)
// 2. Lokale Invoices anhand qbo_id finden
// 3. Payment in lokale payments-Tabelle schreiben
// 4. Invoices als bezahlt markieren (paid_date)

require('dotenv').config();
const { Pool } = require('pg');
const { makeQboApiCall, getOAuthClient } = require('./qbo_helper');

const pool = new Pool({
    user: process.env.DB_USER || 'postgres',
    host: process.env.DB_HOST || 'localhost',
    database: process.env.DB_NAME || 'quotes_db',
    password: process.env.DB_PASSWORD || 'postgres',
    port: process.env.DB_PORT || 5432,
});

async function importPayment(qboPaymentId) {
    const oauthClient = getOAuthClient();
    const companyId = oauthClient.getToken().realmId;
    const baseUrl = process.env.QBO_ENVIRONMENT === 'production'
        ? 'https://quickbooks.api.intuit.com'
        : 'https://sandbox-quickbooks.api.intuit.com';

    console.log(`\n🔍 Lade QBO Payment ${qboPaymentId}...`);

    // 1. Payment aus QBO lesen
    const response = await makeQboApiCall({
        url: `${baseUrl}/v3/company/${companyId}/payment/${qboPaymentId}`,
        method: 'GET'
    });

    const data = response.getJson ? response.getJson() : response.json;
    const payment = data.Payment;

    if (!payment) {
        console.error('❌ Payment nicht gefunden in QBO.');
        process.exit(1);
    }

    console.log(`✅ Payment gefunden:`);
    console.log(`   Datum:     ${payment.TxnDate}`);
    console.log(`   Betrag:    $${payment.TotalAmt}`);
    console.log(`   Referenz:  ${payment.PaymentRefNum || '(keine)'}`);
    console.log(`   Kunde:     ${payment.CustomerRef?.name || payment.CustomerRef?.value}`);

    // 2. Verknüpfte Invoices aus dem Payment extrahieren
    const linkedInvoices = [];
    if (payment.Line) {
        for (const line of payment.Line) {
            if (line.LinkedTxn) {
                for (const txn of line.LinkedTxn) {
                    if (txn.TxnType === 'Invoice') {
                        linkedInvoices.push({
                            qbo_invoice_id: txn.TxnId,
                            amount: line.Amount
                        });
                    }
                }
            }
        }
    }

    console.log(`   Verknüpfte Invoices: ${linkedInvoices.length}`);
    linkedInvoices.forEach(li => {
        console.log(`     - QBO Invoice ID: ${li.qbo_invoice_id}, Amount: $${li.amount}`);
    });

    // 3. Lokale Invoices finden
    const dbClient = await pool.connect();
    try {
        await dbClient.query('BEGIN');

        // Kunden-ID lokal finden
        const customerResult = await dbClient.query(
            'SELECT id FROM customers WHERE qbo_id = $1',
            [payment.CustomerRef?.value]
        );
        const customerId = customerResult.rows[0]?.id || null;

        // PaymentMethod-Name aus QBO holen (optional)
        let paymentMethodName = 'Unknown';
        if (payment.PaymentMethodRef?.value) {
            try {
                const pmRes = await makeQboApiCall({
                    url: `${baseUrl}/v3/company/${companyId}/paymentmethod/${payment.PaymentMethodRef.value}`,
                    method: 'GET'
                });
                const pmData = pmRes.getJson ? pmRes.getJson() : pmRes.json;
                paymentMethodName = pmData.PaymentMethod?.Name || 'Unknown';
            } catch (e) {
                console.log('   ⚠️ PaymentMethod konnte nicht geladen werden.');
            }
        }

        // DepositTo-Account-Name aus QBO (optional)
        let depositToName = '';
        if (payment.DepositToAccountRef?.value) {
            try {
                const accRes = await makeQboApiCall({
                    url: `${baseUrl}/v3/company/${companyId}/account/${payment.DepositToAccountRef.value}`,
                    method: 'GET'
                });
                const accData = accRes.getJson ? accRes.getJson() : accRes.json;
                depositToName = accData.Account?.Name || '';
            } catch (e) {
                console.log('   ⚠️ Account konnte nicht geladen werden.');
            }
        }

        // Prüfen ob Payment schon importiert
        const existing = await dbClient.query(
            'SELECT id FROM payments WHERE qbo_payment_id = $1',
            [String(qboPaymentId)]
        );
        if (existing.rows.length > 0) {
            console.log(`\n⚠️ Payment ${qboPaymentId} wurde bereits importiert (lokale ID: ${existing.rows[0].id}).`);
            console.log('   Übersprungen.');
            await dbClient.query('ROLLBACK');
            return;
        }

        // Payment lokal anlegen
        const paymentResult = await dbClient.query(
            `INSERT INTO payments (payment_date, reference_number, payment_method, deposit_to_account, total_amount, customer_id, qbo_payment_id)
             VALUES ($1, $2, $3, $4, $5, $6, $7) RETURNING *`,
            [payment.TxnDate, payment.PaymentRefNum || null, paymentMethodName, depositToName, payment.TotalAmt, customerId, String(qboPaymentId)]
        );
        const localPaymentId = paymentResult.rows[0].id;
        console.log(`\n💾 Lokales Payment erstellt: ID ${localPaymentId}`);

        // Verknüpfte Invoices lokal finden und markieren
        let matchedCount = 0;
        for (const li of linkedInvoices) {
            const invResult = await dbClient.query(
                'SELECT id, invoice_number FROM invoices WHERE qbo_id = $1',
                [li.qbo_invoice_id]
            );

            if (invResult.rows.length > 0) {
                const localInv = invResult.rows[0];

                await dbClient.query(
                    'INSERT INTO payment_invoices (payment_id, invoice_id, amount) VALUES ($1, $2, $3) ON CONFLICT DO NOTHING',
                    [localPaymentId, localInv.id, li.amount]
                );
                await dbClient.query(
                    'UPDATE invoices SET paid_date = $1, updated_at = CURRENT_TIMESTAMP WHERE id = $2 AND paid_date IS NULL',
                    [payment.TxnDate, localInv.id]
                );

                console.log(`   ✅ Invoice #${localInv.invoice_number || localInv.id} (QBO: ${li.qbo_invoice_id}) → bezahlt`);
                matchedCount++;
            } else {
                console.log(`   ⚠️ QBO Invoice ID ${li.qbo_invoice_id} nicht in lokaler DB gefunden.`);
            }
        }

        await dbClient.query('COMMIT');

        console.log(`\n✅ Import abgeschlossen: ${matchedCount}/${linkedInvoices.length} Invoices verknüpft.`);
        console.log(`   Payment: Lokal ID ${localPaymentId}, QBO ID ${qboPaymentId}`);
        console.log(`   Methode: ${paymentMethodName}, Konto: ${depositToName}`);

    } catch (error) {
        await dbClient.query('ROLLBACK').catch(() => {});
        console.error('❌ Fehler:', error);
    } finally {
        dbClient.release();
        await pool.end();
    }
}

// --- Main ---
const qboPaymentId = process.argv[2];
if (!qboPaymentId) {
    console.log('Verwendung: node import_qbo_payment.js <QBO_PAYMENT_ID>');
    console.log('Beispiel:   node import_qbo_payment.js 20616');
    process.exit(1);
}

importPayment(qboPaymentId).catch(err => {
    console.error('Fatal:', err);
    process.exit(1);
});