// Chops off the last string segment per delimiter. If no delimiter is found in the string then the original string is
// returned instead. The following attributes are accepted:
// string = Required. The string to chop.
// delimiter = Optional. The delimiter used to chop up the string. Defaults to '_'.
function chop_last(string, delimiter) {
	var chopped = string;
	if (delimiter == undefined) {delimiter = '_';}
	var endIndex = string.lastIndexOf(delimiter);
	if (endIndex > 1) {chopped = string.slice(0, endIndex);}
	return chopped;
}

// Increments a number embedded in the text by one. If no number is found then the original text is returned.
function increment_text(text) {
  var match = text.match(/\d+/);
  if (match != null) {
	var number = new Number(match);
	var new_number = number + 1;
	text = text.replace(number, new_number);
  }
  return text;
};

// Suffixes text with a number. Accepts the following arguments:
// text = Required. The text to suffix.
// number = Optional. The number to be suffixed to the text. Defaults to 1.
// delimiter = Optional. The delimiter between the text and number. Defaults to '_'.
function suffix_num_to_text(text, number, delimiter) {
	if (text != null) {
		if (number == undefined) { number = 1; };
		if (delimiter == undefined) { delimiter = '_'; };
		return text + delimiter + number;
	};
};

// Increments the input field ID number by one so ActiveRecord can save new record attributes.
function increment_input_id(input) {
  id = $(input).attr("id");
  id = increment_text(id);
  $(input).attr("id", id);
};

// Increments the input field name number by one so ActiveRecord can save new record attributes.
function increment_input_name(input) {
  name = $(input).attr("name");
  name = increment_text(name);
  $(input).attr("name", name);
};

// Generates a hidden input field based off original input field data that instructs ActiveRecord to delete
// a record based on the ID of the input field.
function generate_destroy_input(input) {
	$(input).attr("id", chop_last($(input).attr("id")) + "__delete");
	$(input).attr("name", chop_last($(input).attr("name"), '[') + "[_delete]");
	$(input).attr("type", "hidden");
	$(input).attr("value", 1);
	return input;
}

// UJS
$(document).ready(function(){
	// Nested New
	$("a.nested-new").click(function(){
		var id = $(this).attr("id");
		var parent_id = '#' + chop_last(id);
		var clone = $(parent_id + " tr:last").clone(true);
		var clone_id = clone.attr("id");
		// Clone for new action.
		if (clone_id.length > 4 && clone_id.substr(0, 4) == "new_") {
			clone_id = clone_id.slice(4);
			clone_id = suffix_num_to_text(clone_id);
			clone.attr("id", clone_id);
		}
		// Clone for edit action.
		else {
			clone.attr("id", increment_text(clone_id));
		}
		$(parent_id).append(clone);
		// Ensure all cloned input fields are unique.
		$.each($('#' + clone.attr("id") + " :input"), function(){
		  	increment_input_id(this);
		  	increment_input_name(this);
			$(this).attr("value", '');
			return this;
		});
		// Ensure default event does not fire.
		return false;
	});
	
	// Nested Destroy
    $("a.nested-destroy").click(function(){
		try {
			var id = $(this).attr("id");
			var parent_id = chop_last(id);
			if (parent_id != id) {
				parent_id = '#' + parent_id;
				$(parent_id).prepend(generate_destroy_input($(parent_id + " input:first").clone()));
				$(parent_id).animate({backgroundColor: "#FF0000"}, 500);
				$(parent_id).fadeOut(500);
			} else {
				throw "Invalid ID";
			}
		} catch (e) {
			alert("Error: " + e + ". Check that parent ID is defined and/or the link ID includes parent ID as part of the link ID.");
		}
		// Ensure default event does not fire.
		return false;
    });

	// Destroy
    $("a.destroy").click(function(){
        var result = confirm("Are you sure you want to delete this?");
        if (result) {
			try {
				var id = $(this).attr("id");
				var parent_id = chop_last(id);
				if (parent_id != id) {
					parent_id = '#' + parent_id;
					$(parent_id).animate({backgroundColor: "#FF0000"}, 500);
					$(parent_id).fadeOut(500);
				} else {
					throw "Invalid ID";
				}
				// Finally, call the destroy action.
	            $.post($(this).attr("href"), "_method=delete");
			} catch (e) {
				alert("Error: " + e + ". Check that parent ID is defined and/or the link ID includes parent ID as part of the link ID.");
			}
        }
		// Ensure default event does not fire.
		return false;
    });
});