js/checkout.js

// ========================================
// CHECKOUT PAGE LOGIC
// ========================================
let currentStepNum = 1;
let paymentMethod = 'cash';

document.addEventListener('DOMContentLoaded', () => {
    if (getCart().length === 0) { window.location.href = 'cart.html'; return; }

    // Auth Check
    if (!isLoggedIn()) {
        showToast("Majburiy", "To'lovni amalga oshirish yoki buyurtma berish uchun iltimos tizimga kiring", "info");
        setTimeout(() => {
            window.location.href = 'index.html'; // In a real app we might open modal directly, but index is safer to initialize auth state
        }, 2000);
        return;
    }

    // Pre-fill user data
    const user = getUser();
    if (user.name) document.getElementById('userName').value = user.name;
    if (user.phone) document.getElementById('userPhone').value = user.phone;
    if (user.email) document.getElementById('userEmail').value = user.email;

    // Payment method selection
    document.querySelectorAll('[data-payment]').forEach(el => {
        el.addEventListener('click', () => {
            document.querySelectorAll('[data-payment]').forEach(e => e.classList.remove('active'));
            el.classList.add('active');
            paymentMethod = el.dataset.payment;
        });
    });

    // Load store location info for step 2
    loadStoreLocation();
});

function loadStoreLocation() {
    const settings = JSON.parse(localStorage.getItem('mtextile_settings')) || {};
    const addressBox = document.getElementById('storeAddressText');
    const mapBox = document.getElementById('storeMapContainer');

    if (settings.address && addressBox) {
        addressBox.textContent = settings.address;
    }
    if (settings.mapIframe && mapBox) {
        mapBox.innerHTML = settings.mapIframe;
        mapBox.style.display = 'block';
        const iframe = mapBox.querySelector('iframe');
        if (iframe) {
            iframe.style.width = '100%';
            iframe.style.height = '100%';
            iframe.style.border = 'none';
        }
    }
}

function goToStep(step) {
    document.querySelectorAll('.checkout-step').forEach(el => el.classList.remove('active'));
    document.getElementById('step' + step).classList.add('active');
    document.querySelectorAll('.progress-step').forEach(el => {
        const s = parseInt(el.dataset.step);
        el.classList.remove('active', 'done');
        if (s < step) el.classList.add('done');
        if (s === step) el.classList.add('active');
    });
    currentStepNum = step;
    window.scrollTo({ top: 0, behavior: 'smooth' });
}

function nextStep(from) {
    if (from === 1 && !validateStep1()) return;
    if (from === 2 && !validateStep2()) return;
    if (from === 3) buildSummary();
    goToStep(from + 1);
}

function prevStep(from) { goToStep(from - 1); }

function validateStep1() {
    let valid = true;
    const name = document.getElementById('userName').value.trim();
    const phone = document.getElementById('userPhone').value.trim();
    const email = document.getElementById('userEmail').value.trim();

    clearErrors();

    if (!name || name.length < 2) {
        showFieldError('userName', 'nameError', 'Ismingizni kiriting (kamida 2 harf)');
        valid = false;
    }
    // Strict UZ phone validation
    const phoneRegex = /^(?:\+?998)[ \-]?\d{2}[ \-]?\d{3}[ \-]?\d{2}[ \-]?\d{2}$/;
    if (!phone || !phoneRegex.test(phone.replace(/\s/g, ''))) {
        showFieldError('userPhone', 'phoneError', 'Faqat O\'zbekiston raqami (+998...) kiritilishi shart');
        valid = false;
    }
    if (email && !/^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(email)) {
        showFieldError('userEmail', 'emailError', 'To\'g\'ri email kiriting');
        valid = false;
    }

    if (valid) saveUser({ name, phone, email });
    return valid;
}

function validateStep2() {
    // Store pickup requires no address input from the user.
    return true;
}

function showFieldError(inputId, errorId, msg) {
    document.getElementById(inputId).classList.add('error');
    document.getElementById(errorId).textContent = msg;
}

function clearErrors() {
    document.querySelectorAll('.form-input.error').forEach(el => el.classList.remove('error'));
    document.querySelectorAll('.form-error').forEach(el => el.textContent = '');
}

function buildSummary() {
    const user = getUser();
    const cart = getCart();
    const totals = getCartTotal();
    const payNames = { cash: '💵 Naqd pul', card: '💳 Plastik karta', click: '📱 Click/Payme' };

    let itemsHTML = '';
    cart.forEach(item => {
        const p = getProductById(item.productId);
        if (!p) return;
        itemsHTML += `<div style="display:flex;align-items:center;gap:1rem;padding:0.75rem 0;border-bottom:1px solid var(--clr-border);">
      <img src="${p.images[0]}" style="width:50px;height:60px;object-fit:cover;border-radius:6px;">
      <div style="flex:1">
        <div style="font-weight:600;font-size:0.9rem;">${p.name}</div>
        <div style="font-size:0.75rem;color:var(--clr-text-muted)">${item.size} | ${COLORS_MAP[item.color]?.name || item.color} | x${item.quantity}</div>
      </div>
      <div style="font-weight:600">${formatPrice(p.price * item.quantity)}</div>
    </div>`;
    });

    document.getElementById('orderSummary').innerHTML = `
    <h3 style="margin-bottom:1rem;font-size:1rem;">📋 Buyurtma tafsilotlari</h3>
    <div style="margin-bottom:1rem;">
      <div style="font-size:0.85rem;color:var(--clr-text-muted)">Buyurtmachi</div>
      <div>${user.name} | ${user.phone}</div>
    </div>
    <div style="margin-bottom:1rem;">
      <div style="font-size:0.85rem;color:var(--clr-text-muted)">Olib ketish manzili</div>
      <div>Do'kon: ${document.getElementById('storeAddressText').textContent}</div>
    </div>
    <div style="margin-bottom:1rem;">
      <div style="font-size:0.85rem;color:var(--clr-text-muted)">To'lov usuli</div>
      <div>${payNames[paymentMethod]}</div>
    </div>
    <div style="margin-bottom:0.5rem;font-weight:600;">Mahsulotlar:</div>
    ${itemsHTML}
    <div style="display:flex;justify-content:space-between;padding-top:1rem;font-size:1.15rem;font-weight:700;">
      <span>Jami summa:</span>
      <span>${formatPrice(totals.total)}</span>
    </div>
  `;
}

async function confirmOrder() {
    const btn = document.querySelector('button[onclick="confirmOrder()"]');
    if (btn) { btn.disabled = true; btn.textContent = "Kutilmoqda..."; }

    const cartItems = getCart(); // Copy before cart is cleared
    const user = getUser();
    const totals = getCartTotal();

    const orderItems = cartItems.map(item => {
        const p = getProductById(item.productId);
        return {
            productId: item.productId,
            name: p?.name || 'Mahsulot',
            price: p?.price || 0,
            size: item.size,
            color: item.color,
            quantity: item.quantity,
            image: p?.images?.[0] || ''
        };
    });

    const orderData = {
        userId: user.id || null, // Will map to ObjectId or be null
        customer: {
            name: user.name,
            phone: user.phone,
            email: user.email || ''
        },
        items: orderItems,
        totals: {
            subtotal: totals.subtotal,
            discount: totals.discount,
            total: totals.total
        },
        paymentMethod: paymentMethod,
        status: 'Kutilmoqda'
    };

    try {
        const order = await API.createOrder(orderData);
        if (order && order.orderId) {
            // Deduct stock locally
            cartItems.forEach(item => deductProductStock(item.productId, item.quantity));
            clearCart();

            // Show success
            document.querySelectorAll('.checkout-step').forEach(el => { el.classList.remove('active'); el.style.display = 'none'; });
            document.querySelector('.progress-steps').style.display = 'none';
            const success = document.getElementById('stepSuccess');
            success.style.display = 'block';
            success.classList.add('active');
            document.getElementById('orderId').textContent = `Buyurtma raqami: ${order.orderId}`;
            updateCartBadge();
        } else {
            throw new Error(order.error || 'Server xatosi');
        }
    } catch (err) {
        showToast('Xatolik', 'Buyurtma yuborishda xatolik yuz berdi.', 'error');
        if (btn) { btn.disabled = false; btn.textContent = "Tugatish va Buyurtma berish"; }
    }
}