// tipsy, facebook style tooltips for jquery
// version 1.0.0a*
// (c) 2008-2010 jason frame [jason@onehackoranother.com]
// released under the MIT license

// * This installation of tipsy includes several local modifications to both Javascript and CSS.
//   Please be careful when upgrading.

( function () {

    function maybeCall(thing, ctx) {
        return (typeof thing == 'function') ? (thing.call(ctx)) : thing;
    }

    function Tipsy(element, options) {
        this.$element = $(element);
        this.options = options;
        this.enabled = true;
        this.keyHandler = $.proxy( this.closeOnEsc, this );
        this.fixTitle();
    }

    Tipsy.prototype = {
        show: function() {
            var title = this.getTitle();
            if (title && this.enabled) {
                var $tip = this.tip();

                $tip.find('.tipsy-inner')[this.options.html ? 'html' : 'text'](title);
                $tip[0].className = 'tipsy'; // reset classname in case of dynamic gravity
                if (this.options.className) {
                    $tip.addClass(maybeCall(this.options.className, this.$element[0]));
                }
                $tip.remove()
                    .css({top: 0, left: 0, visibility: 'hidden', display: 'block'})
                    .attr( 'aria-hidden', 'true' )
                    .appendTo(document.body);

                var pos = $.extend({}, this.$element.offset(), {
                    width: this.$element[0].offsetWidth,
                    height: this.$element[0].offsetHeight
                });

                var gravity = (typeof this.options.gravity == 'function')
                                ? this.options.gravity.call(this.$element[0])
                                : this.options.gravity;

                // Attach css classes before checking height/width so they
                // can be applied.
                $tip.addClass('tipsy-' + gravity);
                if (this.options.className) {
                    $tip.addClass(maybeCall(this.options.className, this.$element[0]));
                }

                var actualWidth = $tip[0].offsetWidth, actualHeight = $tip[0].offsetHeight;
                var tp;
                switch (gravity.charAt(0)) {
                    case 'n':
                        tp = {top: pos.top + pos.height + this.options.offset, left: pos.left + pos.width / 2 - actualWidth / 2};
                        break;
                    case 's':
                        tp = {top: pos.top - actualHeight - this.options.offset, left: pos.left + pos.width / 2 - actualWidth / 2};
                        break;
                    case 'e':
                        tp = {top: pos.top + pos.height / 2 - actualHeight / 2, left: pos.left - actualWidth - this.options.offset};
                        break;
                    case 'w':
                        tp = {top: pos.top + pos.height / 2 - actualHeight / 2, left: pos.left + pos.width + this.options.offset};
                        break;
                }

                if (gravity.length == 2) {
                    if (gravity.charAt(1) == 'w') {
                        if (this.options.center) {
                            tp.left = pos.left + pos.width / 2 - 15;
                        } else {
                            tp.left = pos.left;
                        }
                    } else {
                        if (this.options.center) {
                            tp.left = pos.left + pos.width / 2 - actualWidth + 15;
                        } else {
                            tp.left = pos.left + pos.width;
                        }
                    }
                }
                $tip.css(tp);

                $( document ).on( 'keydown', this.keyHandler );
                if (this.options.fade) {
                    $tip.stop()
                        .css({opacity: 0, display: 'block', visibility: 'visible'})
                        .attr( 'aria-hidden', 'false' )
                        .animate({opacity: this.options.opacity}, 100);
                } else {
                    $tip
                        .css({visibility: 'visible', opacity: this.options.opacity})
                        .attr( 'aria-hidden', 'false' );
                }
            }
        },

        hide: function() {
            $( document ).off( 'keydown', this.keyHandler );
            if (this.options.fade) {
                this.tip().stop().fadeOut(100, function() { $(this).remove(); });
            } else {
                this.tip().remove();
            }
        },

        fixTitle: function() {
            var $e = this.$element;
            if ($e.attr('title') || typeof($e.attr('original-title')) != 'string') {
                $e.attr('original-title', $e.attr('title') || '').removeAttr('title');
            }
        },

        getTitle: function() {
            var title, $e = this.$element, o = this.options;
            this.fixTitle();
            if (typeof o.title == 'string') {
                title = $e.attr(o.title == 'title' ? 'original-title' : o.title);
            } else if (typeof o.title == 'function') {
                title = o.title.call($e[0]);
            }
            title = ('' + title).replace(/(^\s*|\s*$)/, "");
            return title || o.fallback;
        },

        tip: function() {
            if (!this.$tip) {
                this.$tip = $('<div class="tipsy" role="tooltip"></div>').html('<div class="tipsy-arrow"></div><div class="tipsy-inner"></div>');
            }
            return this.$tip;
        },

        validate: function() {
            if (!this.$element[0].parentNode) {
                this.hide();
                this.$element = null;
                this.options = null;
            }
        },

        // $.proxy event handler
        closeOnEsc: function ( e ) {
            if ( e.keyCode === 27 ) {
                this.hide();
            }
        },

        enable: function() { this.enabled = true; },
        disable: function() { this.enabled = false; },
        toggleEnabled: function() { this.enabled = !this.enabled; }
    };

    $.fn.tipsy = function(options) {

        if (options === true) {
            return this.data('tipsy');
        } else if (typeof options == 'string') {
            var tipsy = this.data('tipsy');
            if (tipsy) tipsy[options]();
            return this;
        }

        options = $.extend({}, $.fn.tipsy.defaults, options);

        function get(ele) {
            var tipsy = $.data(ele, 'tipsy');
            if (!tipsy) {
                tipsy = new Tipsy(ele, $.fn.tipsy.elementOptions(ele, options));
                $.data(ele, 'tipsy', tipsy);
            }
            return tipsy;
        }

        function enter() {
            var tipsy = get(this);
            tipsy.hoverState = 'in';
            if (options.delayIn == 0) {
                tipsy.show();
            } else {
                tipsy.fixTitle();
                setTimeout(function() { if (tipsy.hoverState == 'in') tipsy.show(); }, options.delayIn);
            }
        };

        function leave() {
            var tipsy = get(this);
            tipsy.hoverState = 'out';
            if (options.delayOut == 0) {
                tipsy.hide();
            } else {
                setTimeout(function() { if (tipsy.hoverState == 'out') tipsy.hide(); }, options.delayOut);
            }
        };

        this.each(function() { get(this); });

        if ( options.trigger != 'manual' ) {
            var eventIn  = options.trigger == 'hover' ? 'mouseenter focus' : 'focus',
                eventOut = options.trigger == 'hover' ? 'mouseleave blur' : 'blur';
            if ( options.live ) {
                mw.track( 'mw.deprecate', 'tipsy-live' );
                mw.log.warn( 'Use of the "live" option of jquery.tipsy is no longer supported.' );
            }
            this
                .on( eventIn, enter )
                .on( eventOut, leave );
        }

        return this;

    };

    $.fn.tipsy.defaults = {
        className: null,
        delayIn: 0,
        delayOut: 0,
        fade: true,
        fallback: '',
        gravity: 'n',
        center: true,
        html: false,
        live: false,
        offset: 0,
        opacity: 1.0,
        title: 'title',
        trigger: 'hover'
    };

    // Overwrite this method to provide options on a per-element basis.
    // For example, you could store the gravity in a 'tipsy-gravity' attribute:
    // return $.extend({}, options, {gravity: $(ele).attr('tipsy-gravity') || 'n' });
    // (remember - do not modify 'options' in place!)
    $.fn.tipsy.elementOptions = function(ele, options) {
        return $.metadata ? $.extend({}, options, $(ele).metadata()) : options;
    };

    $.fn.tipsy.autoNS = function() {
        return $(this).offset().top > ($(document).scrollTop() + $(window).height() / 2) ? 's' : 'n';
    };

    $.fn.tipsy.autoWE = function() {
        return $(this).offset().left > ($(document).scrollLeft() + $(window).width() / 2) ? 'e' : 'w';
    };

    /**
     * yields a closure of the supplied parameters, producing a function that takes
     * no arguments and is suitable for use as an autogravity function like so:
     *
     * @param margin (int) - distance from the viewable region edge that an
     *        element should be before setting its tooltip's gravity to be away
     *        from that edge.
     * @param prefer (string, e.g. 'n', 'sw', 'w') - the direction to prefer
     *        if there are no viewable region edges effecting the tooltip's
     *        gravity. It will try to vary from this minimally, for example,
     *        if 'sw' is preferred and an element is near the right viewable 
     *        region edge, but not the top edge, it will set the gravity for
     *        that element's tooltip to be 'se', preserving the southern
     *        component.
     */
     $.fn.tipsy.autoBounds = function(margin, prefer) {
        return function() {
            var dir = {ns: prefer[0], ew: (prefer.length > 1 ? prefer[1] : false)},
                boundTop = $(document).scrollTop() + margin,
                boundLeft = $(document).scrollLeft() + margin,
                $this = $(this);

            if ($this.offset().top < boundTop) dir.ns = 'n';
            if ($this.offset().left < boundLeft) dir.ew = 'w';
            if ($(window).width() + $(document).scrollLeft() - $this.offset().left < margin) dir.ew = 'e';
            if ($(window).height() + $(document).scrollTop() - $this.offset().top < margin) dir.ns = 's';

            return dir.ns + (dir.ew ? dir.ew : '');
        }
    };

}() );
