import { getStore } from './store.js';

function round2(num) {
    return Math.round((Number(num) || 0) * 100) / 100;
}

function calculateOrderGrossTotal(lines = []) {
    let total = 0;
    for (const line of lines) {
        const amount = Number(line.amount || 0);
        const net = Number(line.net || 0);
        const rebate = Number(line.rebate || 0);
        const taxrate = Number(line.taxrate || 0);
        const netAfterRebate = net * (1 - rebate / 100);
        const gross = netAfterRebate * (1 + taxrate / 100);
        total += amount * gross;
    }
    return round2(total);
}

function calculatePaidTotal(payments = []) {
    let total = 0;
    for (const payment of payments) {
        total += Number(payment.amount || 0);
    }
    return round2(total);
}

function calculateOrderedQuantity(lines = []) {
    let qty = 0;
    for (const line of lines) {
        qty += Number(line.amount || 0);
    }
    return Math.round(qty * 1000) / 1000;
}

function calculateShippedQuantity(shipments = []) {
    let qty = 0;
    for (const shipment of shipments) {
        for (const line of shipment.lines || []) {
            qty += Number(line.amount || 0);
        }
    }
    return Math.round(qty * 1000) / 1000;
}

async function enrichSingleOrder(store, googleAuthId, order) {
    if (!order) return order;
    const [shippings, payments, shipments] = await Promise.all([
        store.shipping.listByManifestId(googleAuthId, order.id).catch(() => []),
        store.payment.listByManifestId(googleAuthId, order.id).catch(() => []),
        store.shipment.listByOrderId(googleAuthId, order.id).catch(() => []),
    ]);

    const orderLines = Array.isArray(order.lines) ? order.lines : [];
    const paymentsList = Array.isArray(payments) ? payments : [];
    const shipmentsList = Array.isArray(shipments) ? shipments : [];
    const shippingsList = Array.isArray(shippings) ? shippings : [];

    const orderTotal = calculateOrderGrossTotal(orderLines);
    const paidTotal = calculatePaidTotal(paymentsList);
    const orderedQuantity = calculateOrderedQuantity(orderLines);
    const shippedQuantity = calculateShippedQuantity(shipmentsList);

    const allShippings = shippingsList.length > 0 ? shippingsList : shipmentsList.flatMap((s) => s.shippings || []);
    const isPaid = orderTotal > 0 && Math.abs(paidTotal - orderTotal) < 0.01;
    const isShipped = orderedQuantity > 0 && Math.abs(shippedQuantity - orderedQuantity) < 0.001;
    const isDelivered = isShipped || allShippings.some((s) => s.state === 'shipped' || s.state === 'delivered');

    return {
        ...order,
        shipping: shippingsList[0] ?? (shipmentsList[0]?.shippings?.[0] ?? null),
        shippings: allShippings,
        payment: paymentsList[0] ?? null,
        payments: paymentsList,
        shipments: shipmentsList,
        orderTotal,
        paidTotal,
        orderedQuantity,
        shippedQuantity,
        paid: isPaid,
        shipped: isShipped,
        delivered: isDelivered,
    };
}

function formatEnrichedFromSummary(order) {
    const grossTotal = Number(order.grossTotal || 0);
    const paidTotal = Number(order.paidTotal || 0);
    const orderedQuantity = Number(order.orderedQuantity || 0);
    const shippedQuantity = Number(order.shippedQuantity || 0);
    const isPaid = Boolean(order.isPaid);
    const isShipped = Boolean(order.isShipped);

    return {
        ...order,
        shipping: null,
        shippings: [],
        payment: null,
        payments: [],
        shipments: [],
        orderTotal: grossTotal,
        paidTotal,
        orderedQuantity,
        shippedQuantity,
        paid: isPaid,
        shipped: isShipped,
        delivered: isShipped,
    };
}

async function enrichOrderResult(store, googleAuthId, result) {
    if (!result) return result;
    const enrich = (o) => (o?.grossTotal !== undefined ? formatEnrichedFromSummary(o) : enrichSingleOrder(store, googleAuthId, o));
    if (Array.isArray(result)) {
        return Promise.all(result.map(enrich));
    }
    if (Array.isArray(result.orders)) {
        const enrichedOrders = await Promise.all(result.orders.map(enrich));
        return {
            ...result,
            orders: enrichedOrders,
        };
    }
    return result;
}

export async function list(googleAuthId, opts) {
    const store = await getStore();
    const result = await store.order.list(googleAuthId, opts);
    return enrichOrderResult(store, googleAuthId, result);
}

export async function getById(googleAuthId, id) {
    const store = await getStore();
    const order = await store.order.getById(googleAuthId, id);
    return enrichSingleOrder(store, googleAuthId, order);
}

export async function create(googleAuthId, data) {
    const store = await getStore();
    const order = await store.order.create(googleAuthId, data);
    return enrichSingleOrder(store, googleAuthId, order);
}

export async function update(googleAuthId, id, data) {
    const store = await getStore();
    const order = await store.order.update(googleAuthId, id, data);
    return enrichSingleOrder(store, googleAuthId, order);
}

export async function remove(googleAuthId, id) {
    const store = await getStore();
    return store.order.delete(googleAuthId, id);
}