// Подтверждение удаления
document.addEventListener("click", (event) => {
    const button = event.target.closest("[data-confirm]");
    if (!button) return;
    if (!window.confirm(button.getAttribute("data-confirm"))) {
        event.preventDefault();
    }
});

// Автоматический расчет стоимости товара при изменении полей
function calculateProductPrice() {
    const metalSelect = document.getElementById('metal_type_id');
    const weightInput = document.getElementById('weight_grams');
    const complexityInput = document.getElementById('complexity_factor');
    const priceDisplay = document.getElementById('calculated_price_preview');
    
    if (metalSelect && weightInput && complexityInput && priceDisplay) {
        const selectedOption = metalSelect.options[metalSelect.selectedIndex];
        const pricePerGram = parseFloat(selectedOption?.dataset?.pricePerGram || 0);
        const purity = parseFloat(selectedOption?.dataset?.purity || 0);
        const weight = parseFloat(weightInput.value) || 0;
        const complexity = parseFloat(complexityInput.value) || 1;
        
        if (pricePerGram > 0 && purity > 0 && weight > 0) {
            const price = pricePerGram * weight * (purity / 1000) * complexity;
            priceDisplay.innerText = price.toFixed(2) + ' ₽';
        } else {
            priceDisplay.innerText = '—';
        }
    }
}

// Расчет скидки партнера в форме заявки
function calculatePartnerDiscount(totalSales) {
    if (totalSales > 2000000) return 15;
    if (totalSales > 1000000) return 10;
    if (totalSales > 500000) return 5;
    return 0;
}

// Обновление предварительного расчета в форме заявки
function updateOrderPreview() {
    const partnerSelect = document.getElementById('partner_id');
    const itemsContainer = document.getElementById('items_container');
    
    if (!partnerSelect || !itemsContainer) return;
    
    let subtotal = 0;
    const rows = itemsContainer.querySelectorAll('.item-row');
    
    rows.forEach(row => {
        const productSelect = row.querySelector('select[name="product_id[]"]');
        const quantityInput = row.querySelector('input[name="quantity[]"]');
        
        if (productSelect && productSelect.value && quantityInput && quantityInput.value) {
            const price = parseFloat(productSelect.options[productSelect.selectedIndex]?.dataset?.price || 0);
            const quantity = parseFloat(quantityInput.value) || 0;
            subtotal += price * quantity;
        }
    });
    
    let discount = 0;
    if (partnerSelect.value) {
        const totalSales = parseFloat(partnerSelect.options[partnerSelect.selectedIndex]?.dataset?.sales || 0);
        discount = calculatePartnerDiscount(totalSales);
    }
    
    const total = subtotal * (1 - discount / 100);
    
    const subtotalSpan = document.getElementById('preview_subtotal');
    const discountSpan = document.getElementById('preview_discount');
    const totalSpan = document.getElementById('preview_total');
    
    if (subtotalSpan) subtotalSpan.innerText = subtotal.toFixed(2);
    if (discountSpan) discountSpan.innerText = discount;
    if (totalSpan) totalSpan.innerText = total.toFixed(2);
}

// Добавление строки товара в заявку
function addOrderItemRow() {
    const container = document.getElementById('items_container');
    if (!container) return;
    
    const template = document.getElementById('item_row_template');
    if (!template) return;
    
    const newRow = template.content.cloneNode(true);
    container.appendChild(newRow);
    
    attachItemEvents(container.lastElementChild);
    updateOrderPreview();
}

// Удаление строки товара
function removeOrderItem(button) {
    const container = document.getElementById('items_container');
    const row = button.closest('.item-row');
    if (container.children.length > 1) {
        row.remove();
        updateOrderPreview();
    } else {
        alert('Должен быть хотя бы один товар в заявке');
    }
}

// Привязка событий к строке товара
function attachItemEvents(row) {
    const select = row.querySelector('select[name="product_id[]"]');
    const quantity = row.querySelector('input[name="quantity[]"]');
    const removeBtn = row.querySelector('.remove-item');
    
    if (select) select.addEventListener('change', updateOrderPreview);
    if (quantity) quantity.addEventListener('input', updateOrderPreview);
    if (removeBtn) {
        removeBtn.addEventListener('click', () => removeOrderItem(removeBtn));
    }
}

// Инициализация всех динамических элементов
document.addEventListener('DOMContentLoaded', function() {
    // Для формы товара
    const metalSelect = document.getElementById('metal_type_id');
    const weightInput = document.getElementById('weight_grams');
    const complexityInput = document.getElementById('complexity_factor');
    
    if (metalSelect) metalSelect.addEventListener('change', calculateProductPrice);
    if (weightInput) weightInput.addEventListener('input', calculateProductPrice);
    if (complexityInput) complexityInput.addEventListener('input', calculateProductPrice);
    
    calculateProductPrice();
    
    // Для формы заявки
    const partnerSelect = document.getElementById('partner_id');
    if (partnerSelect) partnerSelect.addEventListener('change', updateOrderPreview);
    
    const addItemBtn = document.getElementById('add_item_btn');
    if (addItemBtn) addItemBtn.addEventListener('click', addOrderItemRow);
    
    const existingRows = document.querySelectorAll('#items_container .item-row');
    existingRows.forEach(row => attachItemEvents(row));
    
    updateOrderPreview();
});