var settings_list = ['coffee', 'sandwich', 'dinner'];
var form_id_list = ['V2USFKHPE9TQ4', 'XEGPCQPBT2PDL', 'BRUYL3EFP55CY'];

function switchLeft(setting) {
	var old_value = settings_list[setting];
	var new_setting = Math.max(0, setting - 1);
	var new_value = settings_list[new_setting];
	var new_button_id = form_id_list[new_setting];
	$('#setting').html(new_setting);
	$('#auto_'+old_value).fadeToggle();
	$('#auto_'+new_value).fadeToggle();
	$('#donate_button_id').val(new_button_id);

}

function switchRight(setting) {
	var old_value = settings_list[setting];
	var new_setting = Math.min(2, setting + 1);
	var new_value = settings_list[new_setting];
	var new_button_id = form_id_list[new_setting];
	$('#setting').html(new_setting);
	$('#auto_'+old_value).fadeToggle();
	$('#auto_'+new_value).fadeToggle();
	$('#donate_button_id').val(new_button_id);
}


$(document).ready(function() {
	$('#auto_buy').click(function() {
		$('#donate_form').submit();
	});
	
	$('#auto_left').click(function() {
		var cur_setting = $('#setting').html();
		switchLeft(cur_setting);
	});
	$('#auto_right').click(function() {
		var cur_setting = $('#setting').html();
		switchRight(cur_setting);
	});

});