/*
 * Selection Object
 *
 *
 */

(function (window) {

    var Selectable = function ($container, options) {

        var defaults = {
                allow_multiple: false,
                selector: '',
                callbackSelection: null,
                selectStart: null,
                selectStop: null,
                limit: null
            },
            options = (typeof options == 'object') ? options : {};

        var $this = this;

        if ($container.data('selectionnable')) {
            /* this container is already selectionnable */
            if (window.console) {
                console.error('Trying to apply new selection to existing one');
            }

            return $container.data('selectionnable');
        }

        this.$container = $container;
        this.options = jQuery.extend(defaults, options);
        this.datas = new Array();

        this.$container.data('selectionnable', this);
        this.$container.addClass('selectionnable');
        this.$container
            .on('click', this.options.selector, function(event) {
                if (typeof $this.options.selectStart === 'function') {
                    $this.options.selectStart(jQuery.extend(jQuery.Event('selectStart'), event), $this);
                }

                var $that = jQuery(this);

                var k = get_value($that, $this);

                if (is_shift_key(event) && jQuery('.last_selected', this.$container).filter($this.options.selector).length != 0) {
                    var lst = jQuery($this.options.selector, this.$container);

                    var index1 = jQuery.inArray(jQuery('.last_selected', this.$container).filter($this.options.selector)[0], lst);
                    var index2 = jQuery.inArray($that[0], lst);

                    if (index2 < index1) {
                        var tmp = index1;
                        index1 = (index2 - 1) < 0 ? index2 : (index2 - 1);
                        index2 = tmp;
                    }

                    var stopped = false;

                    if (index2 != -1 && index1 != -1) {
                        var exp = $this.options.selector + ':gt(' + index1 + '):lt(' + (index2 - index1) + ')';

                        $.each(jQuery(exp, this.$container), function (i, n) {
                            if (!jQuery(n).hasClass('selected') && stopped === false) {
                                if (!$this.hasReachLimit()) {
                                    var k = get_value(jQuery(n), $this);
                                    $this.push(k);
                                    jQuery(n).addClass('selected');
                                }
                                else {
                                    alert(language.max_record_selected);
                                    stopped = true;
                                }
                            }
                        });
                    }

                    if ($this.has(k) === false && stopped === false) {
                        if (!$this.hasReachLimit()) {
                            $this.push(k);
                            $that.addClass('selected');
                        }
                        else {
                            alert(language.max_record_selected);
                        }
                    }
                }
                else {
                    if (!is_ctrl_key(event)) {
                        $this.empty().push(k);
                        jQuery('.selected', this.$container).filter($this.options.selector).removeClass('selected');
                        $that.addClass('selected');
                    }
                    else {
                        if ($this.has(k) === true) {
                            $this.remove(k);
                            $that.removeClass('selected');
                        }
                        else {
                            if (!$this.hasReachLimit()) {
                                $this.push(k);
                                $that.addClass('selected');
                            }
                            else {
                                alert(language.max_record_selected);
                            }
                        }
                    }
                }

                jQuery('.last_selected', this.$container).removeClass('last_selected');
                $that.addClass('last_selected');


                if (typeof $this.options.selectStop === 'function') {
                    $this.options.selectStop(jQuery.extend(jQuery.Event('selectStop'), event), $this);
                }

                return false;

            });

        return;
    };

    function get_value(element, Selectable) {
        if (typeof Selectable.options.callbackSelection === 'function') {
            return Selectable.options.callbackSelection(jQuery(element));
        }
        else {
            return jQuery('input[name="id"]', jQuery(element)).val();
        }
    }

    function is_ctrl_key(event) {
        if (event.altKey)
            return true;
        if (event.ctrlKey)
            return true;
        if (event.metaKey)	// apple key opera
            return true;
        if (event.keyCode == '17')	// apple key opera
            return true;
        if (event.keyCode == '224')	// apple key mozilla
            return true;
        if (event.keyCode == '91')	// apple key safari
            return true;

        return false;
    }

    function is_shift_key(event) {
        if (event.shiftKey)
            return true;
        return false;
    }


    Selectable.prototype = {
        push: function (element) {
            if (this.options.allow_multiple === true || !this.has(element)) {
                this.datas.push(element);
            }

            return this;
        },
        hasReachLimit: function () {
            if (this.options.limit !== null && this.options.limit <= this.datas.length) {
                return true;
            }
            return false;
        },
        remove: function (element) {
            this.datas = jQuery.grep(this.datas, function (n) {
                return(n !== element);
            });

            return this;
        },
        has: function (element) {

            return jQuery.inArray(element, this.datas) >= 0;
        },
        get: function () {

            return this.datas;
        },
        empty: function () {
            var $this = this;
            this.datas = new Array();

            jQuery(this.options.selector, this.$container).filter('.selected:visible').removeClass('selected');

            if (typeof $this.options.selectStop === 'function') {
                $this.options.selectStop(jQuery.Event('selectStop'), $this);
            }

            return this;
        },
        length: function () {

            return this.datas.length;
        },
        size: function () {

            return this.datas.length;
        },
        serialize: function (separator) {

            separator = separator || ';';

            return this.datas.join(separator);
        },
        selectAll: function () {
            this.select('*');

            return this;
        },
        select: function (selector) {
            var $this = this,
                stopped = false;

            jQuery(this.options.selector, this.$container).filter(selector).not('.selected').filter(':visible').each(function () {
                if (!$this.hasReachLimit()) {
                    $this.push(get_value(this, $this));
                    $(this).addClass('selected');
                }
                else {
                    if (stopped === false) {
                        alert(language.max_record_selected);
                    }
                    stopped = true;
                }
            });


            if (typeof $this.options.selectStop === 'function') {
                $this.options.selectStop(jQuery.Event('selectStop'), $this);
            }

            return this;
        }
    };

    window.Selectable = Selectable;
})(window);