/*
 * Fuel UX Wizard
 * https://github.com/ExactTarget/fuelux
 *
 * Copyright (c) 2012 ExactTarget
 * Licensed under the MIT license.
 */

(function ($, undefined) {

    //var $ = require('jquery');


    // WIZARD CONSTRUCTOR AND PROTOTYPE

    var Wizard = function (element, options) {
        var kids;

        this.$element = $(element);
        this.options = $.extend({}, $.fn.wizard.defaults, options);
        this.currentStep = this.options.selectedItem.step;
        this.numSteps = this.$element.find('li').length;
        this.$prevBtn = this.$element.find('button.btn-prev');
        this.$nextBtn = this.$element.find('button.btn-next');

        kids = this.$nextBtn.children().detach();
        this.nextText = $.trim(this.$nextBtn.text());
        this.$nextBtn.append(kids);

        // handle events
        this.$prevBtn.on('click', $.proxy(this.previous, this));
        this.$nextBtn.on('click', $.proxy(this.next, this));
        this.$element.on('click', 'li.complete', $.proxy(this.stepclicked, this));

        this.$stepContainer = this.$element.data('target') || 'body';
        this.$stepContainer = $(this.$stepContainer);
    };

    Wizard.prototype = {

        constructor: Wizard,

        setState: function () {
            var canMovePrev = (this.currentStep > 1);
            var firstStep = (this.currentStep === 1);
            var lastStep = (this.currentStep === this.numSteps);

            // disable buttons based on current step
            this.$prevBtn.attr('disabled', (firstStep === true || canMovePrev === false));

            // change button text of last step, if specified
            var data = this.$nextBtn.data();
            if (data && data.last) {
                this.lastText = data.last;
                if (typeof this.lastText !== 'undefined') {
                    // replace text
                    var text = (lastStep !== true) ? this.nextText : this.lastText;
                    var kids = this.$nextBtn.children().detach();
                    this.$nextBtn.text(text).append(kids);
                }
            }

            // reset classes for all steps
            var $steps = this.$element.find('li');
            $steps.removeClass('active').removeClass('complete');
            $steps.find('span.badge').removeClass('badge-info').removeClass('badge-success');

            // set class for all previous steps
            var prevSelector = 'li:lt(' + (this.currentStep - 1) + ')';
            var $prevSteps = this.$element.find(prevSelector);
            $prevSteps.addClass('complete');
            $prevSteps.find('span.badge').addClass('badge-success');

            // set class for current step
            var currentSelector = 'li:eq(' + (this.currentStep - 1) + ')';
            var $currentStep = this.$element.find(currentSelector);
            $currentStep.addClass('active');
            $currentStep.find('span.badge').addClass('badge-info');

            // set display of target element
            var target = $currentStep.data().target;
            //$('.step-pane').removeClass('active');
            this.$stepContainer.find('.step-pane').removeClass('active');
            $(target).addClass('active');

            this.$element.trigger('changed');
        },

        stepclicked: function (e) {
            var li = $(e.currentTarget);

            var index = this.$element.find('li').index(li);

            var evt = $.Event('stepclick');
            this.$element.trigger(evt, {step: index + 1});
            if (evt.isDefaultPrevented()) return;

            this.currentStep = (index + 1);
            this.setState();
        },

        previous: function () {
            var canMovePrev = (this.currentStep > 1);
            if (canMovePrev) {
                var e = $.Event('change');
                this.$element.trigger(e, {step: this.currentStep, direction: 'previous'});
                if (e.isDefaultPrevented()) return;

                this.currentStep -= 1;
                this.setState();
            }
        },

        next: function () {
            var canMoveNext = (this.currentStep + 1 <= this.numSteps);
            var lastStep = (this.currentStep === this.numSteps);

            if (canMoveNext) {
                var e = $.Event('change');
                this.$element.trigger(e, {step: this.currentStep, direction: 'next'});

                if (e.isDefaultPrevented()) return;

                this.currentStep += 1;
                this.setState();
            }
            else if (lastStep) {
                this.$element.trigger('finished');
            }
        },
        selectedItem: function (selectedItem) {
            var retVal, step;

            if (selectedItem) {

                step = selectedItem.step || -1;

                if (step >= 1 && step <= this.numSteps) {
                    this.currentStep = step;
                    this.setState();
                }

                retVal = this;
            }
            else {
                retVal = { step: this.currentStep };
            }
            return retVal;
        }
    };


    // WIZARD PLUGIN DEFINITION

    $.fn.wizard = function (option, value) {
        var methodReturn;

        var $set = this.each(function () {
            var $this = $(this);
            var data = $this.data('wizard');
            var options = typeof option === 'object' && option;

            if (!data) $this.data('wizard', (data = new Wizard(this, options)));
            if (typeof option === 'string') methodReturn = data[option](value);
        });

        return (methodReturn === undefined) ? $set : methodReturn;
    };

    $.fn.wizard.defaults = {
        selectedItem: {step: 1}
    };

    $.fn.wizard.Constructor = Wizard;


    // WIZARD DATA-API

    $(function () {
        $('body').on('mousedown.wizard.data-api', '.wizard', function () {
            var $this = $(this);
            if ($this.data('wizard')) return;
            $this.wizard($this.data());
        });
    });

})(window.jQuery);
