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/**

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 * jQuery support code for our forms

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 */

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(function($) {

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    /*

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     * Form field is empty - i.e. null value

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     *

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     * Pure whitespace also counts

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     */

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    $.fn.empty = function () {

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        return !this.val() || $.trim(this.val()) == "";

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    }

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    /**

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     * Query or set form field disabled state

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     */

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    $.fn.disabled = function (flag) {

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        if (flag == undefined)

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            // XXX: jQuery returns `true` here?

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            return !!this.attr("disabled");

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        if (flag)

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            this.attr("disabled", "disabled");

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        else

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            this.removeAttr("disabled");

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    }

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    /*

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     * When non-zero <select>/<option> is selected, apply that option as pre-filled values for other form items

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     */

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    $.fn.formSelectPreset = function (opts) {

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        opts = $.extend({

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            // which option value is the "default", i.e. 'create new'

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            valueDefault: 0,

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            // which element to apply selected option value (id) to

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            valueTarget: null,

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            // which element to apply selected option text to

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            textTarget: null,

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        }, opts);

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        function update () {

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            // selected option value (i.e. id)

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            value = $(this).val();

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            // selected option text (i.e. title/name)

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            text = $.trim($(this).find("option:selected").text());

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            // fields to set

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            field_values = [

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                [ opts.valueTarget, value ],

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                [ opts.textTarget, text ]

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            ];

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            if (value == opts.valueDefault) {

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                // clear and re-enable fields

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                if (opts.valueTarget && (opts.valueTarget.disabled() || opts.valueTarget.empty())) {

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                    opts.valueTarget.disabled(false);

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                    opts.valueTarget.val("");

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                }

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                if (opts.textTarget && (opts.textTarget.disabled() || opts.textTarget.empty())) {

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                    opts.textTarget.disabled(false);

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                    opts.textTarget.val("");

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                }

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                return;

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            }

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            // set field values

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            if (opts.valueTarget) {

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                opts.valueTarget.disabled(true);

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                opts.valueTarget.val(value);

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            }

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            if (opts.textTarget) {

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                opts.textTarget.disabled(true);

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                opts.textTarget.val(text);

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            }

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        }

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        // update linked field state on update, and startup..

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        this.change(update);

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        this.change()

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    }

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})(jQuery);