/**
 *  @product {object} product information
 * @size product size, get form product.sizes.[0]
 * @return html markup
 **/
function idmAddToBasket(product, size) {
	const can = product?.type === 'product' && product?.sizes?.length === 1 && size;
	if (!can) return '';
	
	const sellBy = size?.unitSellby || 1;
	const precision = size?.unitPrecision || 0;
	const max = (typeof size?.amount === 'number' && size.amount > 0) ? size.amount : '';
	
	return `
    <div class='idm-products-banner__add-to-basket'>
      <form class='idm-products-banner__add-to-basket-form' action='/basketchange.php' method='post'>
        <input type='hidden' name='mode' value='1'>
        <input type='hidden' name='product' value='${escapeHtml(product.id)}'>
        <input type='hidden' name='size' value='${escapeHtml(size.id)}'>

        <div class='idm-products-banner__qty'
             data-sell-by='${escapeHtml(String(sellBy))}'
             data-precision='${escapeHtml(String(precision))}'
             data-max='${escapeHtml(String(max))}'>
          <button type='button' class='idm-products-banner__qty-decrease'>−</button>

          <input type='number'
                 name='number'
                 class='idm-products-banner__qty-input'
                 value='${escapeHtml(String(sellBy))}'
                 step='${escapeHtml(String(sellBy))}'
                 min='${escapeHtml(String(sellBy))}'
                 max='${escapeHtml(String(max))}'>

          <button type='button' class='idm-products-banner__qty-increase'>+</button>
        </div>

        <button type='submit' class='btn --solid --medium idm-products-banner__add-to-basket-button'>
          <span>${<iai:variable vid='Do koszyka' />}</span>
        </button>
      </form>
  </div>`;
}

// +/- i walidacja inputów ilości
document.addEventListener('click', (e) => {
	const wrapper = e.target.closest('.idm-products-banner__qty');
	if (!wrapper) return;
	
	const input = wrapper.querySelector('.idm-products-banner__qty-input');
	const step = parseFloat(wrapper.dataset.sellBy || '1');
	const precision = parseInt(wrapper.dataset.precision || '0');
	const max = parseFloat(wrapper.dataset.max || '999999');
	let current = parseFloat(input.value) || 0;
	
	if (e.target.classList.contains('idm-products-banner__qty-increase')) {
		current += step;
		if (current > max) current = max;
	} else if (e.target.classList.contains('idm-products-banner__qty-decrease')) {
		current -= step;
		if (current < step) current = step;
	}
	
	input.value = current.toFixed(precision);
});

document.addEventListener('blur', (e) => {
	if (!e.target.classList.contains('idm-products-banner__qty-input')) return;
	
	const input = e.target;
	const wrapper = input.closest('.idm-products-banner__qty');
	const step = parseFloat(wrapper.dataset.sellBy || '1');
	const precision = parseInt(wrapper.dataset.precision || '0');
	const max = parseFloat(wrapper.dataset.max || '999999');
	
	let val = parseFloat(input.value);
	if (isNaN(val) || val < step) {
		val = step;
	} else if (val > max) {
		val = max;
	} else {
		val = Math.round(val / step) * step;
	}
	
	input.value = val.toFixed(precision);
}, true);

// helper
const escapeHtml = (v = '') => String(v)
	.replace(/&/g, '&amp;').replace(/</g, '&lt;')
	.replace(/>/g, '&gt;').replace(/"/g, '&quot;')
	.replace(/'/g, '&#039;');