const itemsData = 1;
const lang = '1';
const currencyLabel = '1';
const decimalPrecision = 1;
const editOrderId = 1;
const loyaltyEnabled = 1;
const pointsPerCurrency = 1;
const currencyPerPoint = 1;

let cart = 1;
let selectionModal;
let paymentModal;
let customerLoyaltyPoints = 0;
let pointsToRedeem = 0;

// If not editing, try to load from local storage
if (!editOrderId) {
    try {
        const saved = localStorage.getItem('pos_cart');
        if (saved) {
            const parsed = JSON.parse(saved);
            if (Array.isArray(parsed) && parsed.length > 0) cart = parsed;
        }
    } catch (e) { console.error('Cart parse error', e); }
}

document.addEventListener('DOMContentLoaded', () => {
    if (typeof bootstrap !== 'undefined') {
        const modalEl = document.getElementById('selectionModal');
        if (modalEl) selectionModal = new bootstrap.Modal(modalEl);

        const payModalEl = document.getElementById('paymentModal');
        if (payModalEl) paymentModal = new bootstrap.Modal(payModalEl);
    }

    // Category filtering
    document.querySelectorAll('.cat-filter').forEach(btn => {
        btn.onclick = () => {
            const cat = btn.getAttribute('data-cat');
            document.querySelectorAll('.cat-filter').forEach(b => b.classList.remove('btn-primary'));
            document.querySelectorAll('.cat-filter').forEach(b => b.classList.add('btn-white', 'border'));
            btn.classList.add('btn-primary');
            btn.classList.remove('btn-white', 'border');
            
            document.querySelectorAll('.item-card-wrapper').forEach(card => {
                if (cat === 'all' || card.getAttribute('data-cat') === cat) card.style.display = 'block';
                else card.style.display = 'none';
            });
        };
    });

    // Search
    const searchInput = document.getElementById('itemSearch');
    if (searchInput) {
        searchInput.addEventListener('input', function(e) {
            const q = e.target.value.toLowerCase();
            document.querySelectorAll('.item-card-wrapper').forEach(card => {
                const en = card.getAttribute('data-name-en') || '';
                const ar = card.getAttribute('data-name-ar') || '';
                if (en.includes(q) || ar.includes(q)) card.style.display = 'block';
                else card.style.display = 'none';
            });
        });
    }

    // Persistent Customer Search
    const custSearchInput = document.getElementById('customerSearchInput');
    const custResults = document.getElementById('customerResults');
    const clearCustBtn = document.getElementById('clearCustomerBtn');
    const custIdInput = document.getElementById('customerId');

    // Handle Edit Customer Pre-fill
    <?php if ($edit_order && $edit_order['customer_id']): ?>
        const initialCustId = "1";
        const initialCustBtn = document.querySelector(`.customer-result-item[data-id="${initialCustId}"]`);
        if (initialCustBtn) {
            selectCustomer(initialCustId, initialCustBtn.getAttribute('data-name'), initialCustBtn.getAttribute('data-points'));
        }
    <?php endif; ?>

    if (custSearchInput) {
        custSearchInput.addEventListener('focus', () => {
            custResults.classList.remove('d-none');
        });

        custSearchInput.addEventListener('input', function(e) {
            const q = e.target.value.toLowerCase();
            custResults.classList.remove('d-none');
            document.querySelectorAll('.customer-result-item').forEach(item => {
                const search = item.getAttribute('data-search') || '';
                if (search.includes(q)) {
                    item.parentElement.style.display = 'block';
                } else {
                    item.parentElement.style.display = 'none';
                }
            });
        });

        document.addEventListener('click', function(e) {
            if (!document.getElementById('customerSearchWrapper').contains(e.target)) {
                custResults.classList.add('d-none');
            }
        });
    }

    if (clearCustBtn) {
        clearCustBtn.addEventListener('click', () => {
            resetCustomerSelection();
        });
    }

    custResults.addEventListener('click', function(e) {
        const btn = e.target.closest('.customer-result-item');
        if (btn) {
            const id = btn.getAttribute('data-id');
            const name = btn.getAttribute('data-name');
            const points = btn.getAttribute('data-points') || 0;
            selectCustomer(id, name, points);
            custResults.classList.add('d-none');
        }
    });

    updateCart();
});

function selectCustomer(id, name, points) {
    const custIdInput = document.getElementById('customerId');
    const custSearchInput = document.getElementById('customerSearchInput');
    const clearCustBtn = document.getElementById('clearCustomerBtn');
    const loyaltyDisplay = document.getElementById('loyaltyDisplay');
    const loyaltyRedeemUI = document.getElementById('loyaltyRedeemUI');
    const customerPointsEl = document.getElementById('customerPoints');
    const redeemHint = document.getElementById('redeemHint');

    custIdInput.value = id;
    customerLoyaltyPoints = parseFloat(points);
    
    if (id) {
        custSearchInput.value = name;
        clearCustBtn.classList.remove('d-none');
        if (loyaltyEnabled) {
            loyaltyDisplay.classList.remove('d-none');
            loyaltyRedeemUI.classList.remove('d-none');
            customerPointsEl.innerText = customerLoyaltyPoints.toFixed(2);
            if (redeemHint) {
                redeemHint.innerText = lang === 'en' 
                    ? `1 Point = ${currencyPerPoint} ${currencyLabel}` 
                    : `1 نقطة = ${currencyPerPoint} ${currencyLabel}`;
            }
        }
    } else {
        resetCustomerSelection();
    }
}

function resetCustomerSelection() {
    const custIdInput = document.getElementById('customerId');
    const custSearchInput = document.getElementById('customerSearchInput');
    const clearCustBtn = document.getElementById('clearCustomerBtn');
    const loyaltyDisplay = document.getElementById('loyaltyDisplay');
    const loyaltyRedeemUI = document.getElementById('loyaltyRedeemUI');

    custIdInput.value = '';
    custSearchInput.value = '';
    custSearchInput.placeholder = lang === 'en' ? 'Walk-in Customer' : 'عميل عابر';
    clearCustBtn.classList.add('d-none');
    loyaltyDisplay.classList.add('d-none');
    loyaltyRedeemUI.classList.add('d-none');
    customerLoyaltyPoints = 0;
    pointsToRedeem = 0;
    const ptsInput = document.getElementById('pointsToRedeem');
    if (ptsInput) ptsInput.value = '';
    updateCart();
}

function applyPoints() {
    const ptsInput = document.getElementById('pointsToRedeem');
    let val = parseFloat(ptsInput.value) || 0;
    if (val > customerLoyaltyPoints) {
        alert(lang === 'en' ? 'Insufficient points' : 'نقاط غير كافية');
        val = customerLoyaltyPoints;
        ptsInput.value = val;
    }
    pointsToRedeem = val;
    updateCart();
}

function showOptions(itemId) {
    const item = itemsData[itemId];
    if (!item) return;
    const itemNameEl = document.getElementById('selectionItemName');
    if (itemNameEl) itemNameEl.innerText = lang === 'en' ? item.name_en : item.name_ar;
    const list = document.getElementById('optionsList');
    if (list) {
        list.innerHTML = '';
        item.services.forEach(s => {
            const col = document.createElement('div');
            col.className = 'col-6';
            col.innerHTML = `
                <button class="btn btn-outline-primary w-100 p-3 rounded-4 border-2 text-center h-100 transition-all" onclick="addToCart(${item.id}, ${s.id})">
                    <div class="fw-bold mb-1 small">${lang === 'en' ? s.name_en : s.name_ar}</div>
                    <div class="small opacity-75">${s.price.toFixed(decimalPrecision)} ${currencyLabel}</div>
                </button>
            `;
            list.appendChild(col);
        });
    }
    if (selectionModal) selectionModal.show();
}

function addToCart(itemId, serviceId) {
    const item = itemsData[itemId];
    if (!item) return;
    const service = item.services.find(s => s.id === serviceId);
    if (!service) return;
    
    const existing = cart.find(i => i.item_id === itemId && i.service_id === serviceId);
    if (existing) {
        existing.qty++;
    } else {
        cart.push({
            item_id: itemId,
            service_id: serviceId,
            name: lang === 'en' ? item.name_en : item.name_ar,
            service_name: lang === 'en' ? service.name_en : service.name_ar,
            price: service.price,
            qty: 1,
            vat_percent: item.vat_percent
        });
    }
    if (selectionModal) selectionModal.hide();
    updateCart();
}

function changeQty(index, delta) {
    cart[index].qty += delta;
    if (cart[index].qty <= 0) cart.splice(index, 1);
    updateCart();
}

function updateCart() {
    if (!editOrderId) {
        localStorage.setItem('pos_cart', JSON.stringify(cart));
    }
    const cartList = document.getElementById('cartItems');
    const emptyCart = document.getElementById('emptyCart');
    if (!cartList || !emptyCart) return;
    
    if (cart.length === 0) {
        cartList.innerHTML = '';
        emptyCart.style.display = 'block';
    } else {
        emptyCart.style.display = 'none';
        cartList.innerHTML = cart.map((item, index) => `
            <div class="d-flex align-items-center mb-3 bg-light p-2 rounded-3">
                <div class="flex-grow-1">
                    <div class="fw-bold small text-dark">${item.name}</div>
                    <div class="text-muted" style="font-size: 0.75rem;">${item.service_name}</div>
                    <div class="fw-bold text-primary">${item.price.toFixed(decimalPrecision)} ${currencyLabel}</div>
                </div>
                <div class="d-flex align-items-center bg-white rounded-3 p-1">
                    <button class="btn btn-sm p-0 px-2" onclick="changeQty(${index}, -1)"><i class="bi bi-dash"></i></button>
                    <span class="mx-2 fw-bold">${item.qty}</span>
                    <button class="btn btn-sm p-0 px-2" onclick="changeQty(${index}, 1)"><i class="bi bi-plus"></i></button>
                </div>
            </div>
        `).join('');
    }
    
    let subtotal = 0;
    let totalVat = 0;
    
    cart.forEach(item => {
        const itemSubtotal = item.price * item.qty;
        subtotal += itemSubtotal;
        totalVat += itemSubtotal * ((item.vat_percent || 15) / 100);
    });

    const subtotalEl = document.getElementById('cartSubtotal');
    const vatEl = document.getElementById('cartVat');
    const totalEl = document.getElementById('cartTotal');
    const discountRow = document.getElementById('loyaltyDiscountRow');
    const discountEl = document.getElementById('cartLoyaltyDiscount');

    let totalBeforeDiscount = subtotal + totalVat;
    let loyaltyDiscount = pointsToRedeem * currencyPerPoint;

    if (loyaltyDiscount > totalBeforeDiscount) {
        loyaltyDiscount = totalBeforeDiscount;
        pointsToRedeem = loyaltyDiscount / currencyPerPoint;
    }

    if (loyaltyDiscount > 0) {
        discountRow.classList.remove('d-none');
        discountEl.innerText = '-' + loyaltyDiscount.toFixed(decimalPrecision) + ' ' + currencyLabel;
    } else {
        discountRow.classList.add('d-none');
    }

    const finalTotal = totalBeforeDiscount - loyaltyDiscount;
    
    if (subtotalEl) subtotalEl.innerText = subtotal.toFixed(decimalPrecision) + ' ' + currencyLabel;
    if (vatEl) vatEl.innerText = totalVat.toFixed(decimalPrecision) + ' ' + currencyLabel;
    if (totalEl) totalEl.innerText = finalTotal.toFixed(decimalPrecision) + ' ' + currencyLabel;
}

function clearCart() {
    if (confirm(lang === 'en' ? 'Clear cart?' : 'مسح السلة؟')) {
        cart = [];
        pointsToRedeem = 0;
        const ptsInput = document.getElementById('pointsToRedeem');
        if (ptsInput) ptsInput.value = '';
        updateCart();
    }
}

function checkout() {
    if (cart.length === 0) return;
    
    let subtotal = 0;
    let totalVat = 0;
    cart.forEach(item => {
        const itemSubtotal = item.price * item.qty;
        subtotal += itemSubtotal;
        totalVat += itemSubtotal * ((item.vat_percent || 15) / 100);
    });

    let finalTotal = (subtotal + totalVat) - (pointsToRedeem * currencyPerPoint);
    if (finalTotal < 0) finalTotal = 0;

    document.getElementById('paymentTotalAmount').innerText = finalTotal.toFixed(decimalPrecision) + ' ' + currencyLabel;
    if (paymentModal) paymentModal.show();
}

async function completeCheckout(paymentMethod) {
    const cid = document.getElementById('customerId').value;
    
    let subtotal = 0;
    let totalVat = 0;
    const itemsToSubmit = cart.map(item => {
        const itemSubtotal = item.price * item.qty;
        const itemVat = itemSubtotal * ((item.vat_percent || 15) / 100);
        subtotal += itemSubtotal;
        totalVat += itemVat;
        return {
            itemId: item.item_id,
            serviceId: item.service_id,
            variantId: null,
            quantity: item.qty,
            price: item.price,
            vatAmount: itemVat
        };
    });

    const totalPrice = subtotal + totalVat;

    try {
        const response = await fetch('api/checkout.php', {
            method: 'POST',
            headers: { 'Content-Type': 'application/json' },
            body: JSON.stringify({ 
                order_id: editOrderId,
                customer_id: cid, 
                items: itemsToSubmit, 
                vat_total: totalVat, 
                total_price: totalPrice,
                payment_method: paymentMethod,
                points_to_redeem: pointsToRedeem
            })
        });
        const res = await response.json();
        if (res.success) {
            const orderId = res.order_id || editOrderId;
            if (!editOrderId) { cart = []; updateCart(); localStorage.removeItem("pos_cart"); } window.location.href = "receipt.php?id=" + orderId;
        } else alert(res.error);
    } catch (e) { alert('Error'); }
}


async function saveCustomer() {
    const form = document.getElementById('addCustomerForm');
    if (!form) return;
    const data = new FormData(form);
    try {
        const response = await fetch('api/add_customer.php', { method: 'POST', body: data });
        const res = await response.json();
        if (res.success) {
            const id = res.customer.id;
            const nameEn = res.customer.name_en;
            const nameAr = res.customer.name_ar || nameEn;
            const phone = res.customer.phone;
            const displayName = lang === 'en' ? nameEn : nameAr;
            
            selectCustomer(id, displayName, 0);
            
            const list = document.getElementById('customerResultsList');
            if (list) {
                const searchStr = `${nameEn} ${nameAr} ${phone}`.toLowerCase();
                const div = document.createElement('div');
                div.className = 'p-1';
                div.innerHTML = `
                    <button class="btn btn-white btn-sm w-100 text-start rounded-2 customer-result-item p-2" type="button" data-id="${id}" data-name="${displayName}" data-phone="${phone}" data-search="${searchStr}" data-points="0">
                        <div class="fw-bold small text-dark">${displayName}</div>
                        <div class="text-muted small" style="font-size: 0.7rem;">${phone}</div>
                    </button>
                `;
                list.prepend(div);
            }

            if (typeof bootstrap !== 'undefined') {
                const modalEl = document.getElementById('addCustomerModal');
                if (modalEl) {
                    const modal = bootstrap.Modal.getInstance(modalEl);
                    if (modal) modal.hide();
                }
            }
            form.reset();
        } else alert(res.error);
    } catch (e) { alert('Error'); }
}