// This function will analyse the contents of the pricing form and will calculate the
// appropriate price shown next to the add to basket option this will show the actual
// price of all good being added rather than the individual costs elements
function dynamic_pricing_calc_css(form, $currency_symbol)
{
	// start by working out wether or not we are working with a single item or
	// wether there are multiple options we can check to see if a control is an array
	var total_cost = 0;
	var total_discount = 0;
	var quantity = 0;
	var unit_cost = 0;
	var line_cost = 0;

	// This is a global variable defined in core_system.js and can be used to alert the user when they are about
	// to navigate away before saving / commiting any changes they have made
	user_changes = true;

	// Check for no-option standard product pricing
	if (form.product_quantity) {
		// This is just a straight product pricing option
		total_cost = (form.product_quantity.value * form.product_cost.value);

		// Check to see if there are any QPB values for this item
		var quantity = form.product_quantity.value;
		var quantity_name = 'qpb_quantity_'  + form.primary_product_id.value;
		var costs_name = 'qpb_value_'  + form.product_id.value;
		var div_name = 'item_price_'  + form.product_id.value;
		var item_price_div = document.getElementById(div_name);
		var break_quantities = document.getElementsByName(quantity_name);
		var break_values = document.getElementsByName(costs_name);

		// Handle both multiple and single breaks
		form.product_cost.value = form.product_original_cost.value;
		if (break_quantities.length) {
			for (var i=0; i < break_quantities.length; i++) {
				var check_quantity = break_quantities[i].value;
				if (parseInt(quantity) >= parseInt(check_quantity)) {
					form.product_cost.value = break_values[i].value;
				}
			}
		} else {
			// Single break value
			if (quantity >= break_quantities.value) {
				form.product_cost.value = break_values.value;
			}
		}

		// Update the item price if possible
		if (item_price_div) {
			var item_value = form.product_cost.value;
			item_price_div.innerHTML = $currency_symbol + parseFloat(item_value).toFixed(2);
		}

		// Now we can calculate the line total
		total_cost = quantity * form.product_cost.value;
		total_discount = quantity * (form.product_standard_price.value - form.product_cost.value);
		if (total_discount < 0) total_discount = 0;
	} else {
		// Check to see if there are multiple options available
		quantities = document.getElementsByName('variation_quantity[]');
		product_ids = document.getElementsByName('variation_product_id[]');
		product_costs = document.getElementsByName('variation_cost[]');
		product_original_costs = document.getElementsByName('variation_original_cost[]');
		standard_costs = document.getElementsByName('variation_standard_price[]');
		if (quantities.length) {
			for (var n=0; n < quantities.length; n++) {
				// Check to see if there are any QPB values for this item
				var quantity = quantities[n].value;
				var product_id = product_ids[n].value;
				var quantity_name = 'qpb_quantity_'  + product_id + '[]';
				var costs_name = 'qpb_value_'  + product_id + '[]';
				var div_name = 'item_price_'  + product_id;
				var item_price_div = document.getElementById(div_name);
				var break_quantities = document.getElementsByName(quantity_name);
				var break_values = document.getElementsByName(costs_name);

				// Handle both multiple and single breaks
				product_costs[n].value = product_original_costs[n].value;
				if (break_quantities.length) {
					for (var i=0; i < break_quantities.length; i++) {
						var check_quantity = break_quantities[i].value;
						if (parseInt(quantity) >= parseInt(check_quantity)) {
							product_costs[n].value = break_values[i].value;
						}
					}
				} else {
					// Single break value
					if (quantity >= break_quantities.value) {
						product_costs[n].value = break_values.value;
					}
				}

				// Update the item price if possible
				if (item_price_div) {
					var item_value = product_costs[n].value;
					item_price_div.innerHTML = $currency_symbol + parseFloat(item_value).toFixed(2);
				}

				// Now we can calculate the line total
				line_cost = quantity * product_costs[n].value;
				line_discount = quantity * (standard_costs[n].value - product_costs[n].value);
				if (line_discount < 0) line_discount = 0;
				total_cost = total_cost + line_cost;
				total_discount = total_discount + line_discount;
			}
		} else {
			// Check to see if there are any QPB values for this item
			var quantity = form.variation_quantity.value;
			var quantity_name = 'qpb_quantity_'  + form.variation_product_id.value + '[]';
			var costs_name = 'qpb_value_'  + form.variation_product_id.value + '[]';
			var div_name = 'item_price_'  + form.variation_product_id.value;
			var item_price_div = document.getElementById(div_name);
			var break_quantities = document.getElementsByName(quantity_name);
			var break_values = document.getElementsByName(costs_name);

			// Handle both multiple and single breaks
			form.variation_cost.value = form.variation_orginal_cost.value;
			if (break_quantities.length) {
				for (var i=0; i < break_quantities.length; i++) {
					var check_quantity = break_quantities[i].value;
					if (parseInt(quantity) >= parseInt(check_quantity)) {
						form.variation_cost.value = break_values[i].value;
					}
				}
			} else {
				// Single break value
				if (quantity >= break_quantities.value) {
					form.variation_cost.value = break_values.value;
				}
			}

			// Update the item price if possible
			if (item_price_div) {
				var item_value = form.variation_cost.value;
				item_price_div.innerHTML = $currency_symbol + parseFloat(item_value).toFixed(2);
			}

			total_cost = (form.variation_quantity.value * form.variation_cost.value);
			total_discount = form.variation_quantity.value * (form.variation_standard_price.value - form.variation_cost.value);
		}
	}

	// Sanity check the discount
	if (total_discount < 0) total_discount = 0;

	// Check to make sure we can find the element on the form we need to write back to
	discount_div = document.getElementById('dynamic_cost_calc_discount');
	output_div = document.getElementById('dynamic_cost_calc_total');
	if (output_div) {
		output_div.innerHTML = 'Cost: ' + formatCurrency(total_cost, $currency_symbol);
	}
	if (discount_div) {
	    if (total_discount > 0.01) discount_div.style.display = '';
	    else discount_div.style.display = 'none';
		discount_div.innerHTML = 'Online Saving: ' + formatCurrency(total_discount, $currency_symbol);
	}
}


// This function will analyse the contents of the pricing form and will calculate the
// appropriate price shown next to the add to basket option this will show the actual
// price of all good being added rather than the individual costs elements
function dynamic_pricing_calc(form, $currency_symbol)
{
	// start by working out wether or not we are working with a single item or
	// wether there are multiple options we can check to see if a control is an array
	var total_cost = 0;
	var total_discount = 0;
	var quantity = 0;
	var unit_cost = 0;
	var line_cost = 0;

	// This is a global variable defined in core_system.js and can be used to alert the user when they are about
	// to navigate away before saving / commiting any changes they have made
	user_changes = true;

	// Check for no-option standard product pricing
	if (form.product_quantity) {
		// This is just a straight product pricing option
		total_cost = (form.product_quantity.value * form.product_cost.value);

		// Check to see if there are any QPB values for this item
		var quantity = form.product_quantity.value;
		var quantity_name = 'qpb_quantity_'  + form.primary_product_id.value;
		var costs_name = 'qpb_value_'  + form.product_id.value;
		var div_name = 'item_price_'  + form.product_id.value;
		var item_price_div = document.getElementById(div_name);
		var break_quantities = document.getElementsByName(quantity_name);
		var break_values = document.getElementsByName(costs_name);

		// Handle both multiple and single breaks
		form.product_cost.value = form.product_original_cost.value;
		if (break_quantities.length) {
			for (var i=0; i < break_quantities.length; i++) {
				var check_quantity = break_quantities[i].value;
				if (parseInt(quantity) >= parseInt(check_quantity)) {
					form.product_cost.value = break_values[i].value;
				}
			}
		} else {
			// Single break value
			if (quantity >= break_quantities.value) {
				form.product_cost.value = break_values.value;
			}
		}

		// Update the item price if possible
		if (item_price_div) {
			var item_value = form.product_cost.value;
			item_price_div.innerHTML = $currency_symbol + parseFloat(item_value).toFixed(2);
		}

		// Now we can calculate the line total
		total_cost = quantity * form.product_cost.value;
		total_discount = quantity * (form.product_standard_price.value - form.product_cost.value);
		if (total_discount < 0) total_discount = 0;
	} else {
		// Check to see if there are multiple options available
		if (form.variation_quantity.length) {
			for (var n=0; n < form.variation_quantity.length; n++) {
				// Check to see if there are any QPB values for this item
				var quantity = form.variation_quantity[n].value;
				var quantity_name = 'qpb_quantity_'  + form.variation_product_id[n].value + '[]';
				var costs_name = 'qpb_value_'  + form.variation_product_id[n].value + '[]';
				var div_name = 'item_price_'  + form.variation_product_id[n].value;
				var item_price_div = document.getElementById(div_name);
				var break_quantities = document.getElementsByName(quantity_name);
				var break_values = document.getElementsByName(costs_name);

				// Handle both multiple and single breaks
				form.variation_cost[n].value = form.variation_orginal_cost[n].value;
				if (break_quantities.length) {
					for (var i=0; i < break_quantities.length; i++) {
						var check_quantity = break_quantities[i].value;
						if (parseInt(quantity) >= parseInt(check_quantity)) {
							form.variation_cost[n].value = break_values[i].value;
						}
					}
				} else {
					// Single break value
					if (quantity >= break_quantities.value) {
						form.variation_cost[n].value = break_values.value;
					}
				}

				// Update the item price if possible
				if (item_price_div) {
					var item_value = form.variation_cost[n].value;
					item_price_div.innerHTML = $currency_symbol + parseFloat(item_value).toFixed(2);
				}

				// Now we can calculate the line total
				line_cost = quantity * form.variation_cost[n].value;
				line_discount = quantity * (form.variation_standard_price[n].value - form.variation_cost[n].value);
				if (line_discount < 0) line_discount = 0;
				total_cost = total_cost + line_cost;
				total_discount = total_discount + line_discount;
			}
		} else {
			// Check to see if there are any QPB values for this item
			var quantity = form.variation_quantity.value;
			var quantity_name = 'qpb_quantity_'  + form.variation_product_id.value + '[]';
			var costs_name = 'qpb_value_'  + form.variation_product_id.value + '[]';
			var div_name = 'item_price_'  + form.variation_product_id.value;
			var item_price_div = document.getElementById(div_name);
			var break_quantities = document.getElementsByName(quantity_name);
			var break_values = document.getElementsByName(costs_name);

			// Handle both multiple and single breaks
			form.variation_cost.value = form.variation_orginal_cost.value;
			if (break_quantities.length) {
				for (var i=0; i < break_quantities.length; i++) {
					var check_quantity = break_quantities[i].value;
					if (parseInt(quantity) >= parseInt(check_quantity)) {
						form.variation_cost.value = break_values[i].value;
					}
				}
			} else {
				// Single break value
				if (quantity >= break_quantities.value) {
					form.variation_cost.value = break_values.value;
				}
			}

			// Update the item price if possible
			if (item_price_div) {
				var item_value = form.variation_cost.value;
				item_price_div.innerHTML = $currency_symbol + parseFloat(item_value).toFixed(2);
			}

			total_cost = (form.variation_quantity.value * form.variation_cost.value);
			total_discount = form.variation_quantity.value * (form.variation_standard_price.value - form.variation_cost.value);
		}
	}

	// Sanity check the discount
	if (total_discount < 0) total_discount = 0;

	// Check to make sure we can find the element on the form we need to write back to
	discount_div = document.getElementById('dynamic_cost_calc_discount');
	output_div = document.getElementById('dynamic_cost_calc_total');
	if (output_div) {
		output_div.innerHTML = 'Cost: ' + formatCurrency(total_cost, $currency_symbol);
	}
	if (discount_div) {
		discount_div.innerHTML = 'Online Saving: ' + formatCurrency(total_discount, $currency_symbol);
	}
}

// This function will format the specified value into a suitable format for the screen
function formatCurrency(num, $currency_symbol)
{
	// Clean up the number string
	num = num.toString().replace(/\|\,/g,'');
	// Default to zero if invalid
	if(isNaN(num)) num = "0";
	sign = (num == (num = Math.abs(num)));
	num = Math.floor(num*100+0.50000000001);
	cents = num%100;
	num = Math.floor(num/100).toString();
	if(cents<10) cents = "0" + cents;
	for (var i = 0; i < Math.floor((num.length-(1+i))/3); i++)
	num = num.substring(0,num.length-(4*i+3))+','+
	num.substring(num.length-(4*i+3));
	return (((sign)?'':'-') + $currency_symbol + num + '.' + cents);
}


// This function will validate a standard pricing panel to ensure all of the
// relevant information has been provided to ensure sensible data is sent to
// the server in the future
function product_add_validation(form)
{

	// Initialise the variables
	var error = 0; var error_message = "PLEASE COMPLETE THE FOLLOWING\n\n";
	var quantity = 0;

	// Check for no-option standard product pricing
	if (form.product_quantity) {
		// This is just a straight product pricing option
		quantity = form.product_quantity.value;
	} else {

	    quantities = $( form ).getElements( 'input[name^=variation_quantity]' );
	    quantities.each( function( variation_quantity ) {

	        quantity = quantity + variation_quantity.value;

	    });

	}

	// Make sure we have a quantity at this point
	if (quantity <= 0) {
		error = 1;
		error_message = "Please specify a valid quantity";
	}

	// Check to make sure we can continue
	if (error == 1) {
		alert(error_message);
		return false;
	} else {
		return true;
	}
}