/*! lightgallery - v1.2.0 - 2015-08-26
* http://sachinchoolur.github.io/lightgallery/
* copyright (c) 2015 sachin n; licensed apache 2.0 */
/**
 * zoom plugin
 * @version 1.2.0
 * @author sachin n - @sachinchoolur
 * @license mit license (mit)
 */
(function($, window, document, undefined) {

    'use strict';

    var defaults = {
        scale: 1,
        zoom: true,
        enablezoomafter: 300
    };

    var zoom = function(element) {

        this.core = $(element).data('lightgallery');

        this.core.s = $.extend({}, defaults, this.core.s);

        if (this.core.s.zoom && this.core.docss()) {
            this.init();
            this.zoomabletimeout = false;
        }

        return this;
    };

    zoom.prototype.init = function() {

        var _this = this;
        var zoomicons = '<span id="lg-zoom-in" class="lg-icon"></span><span id="lg-zoom-out" class="lg-icon"></span>';

        this.core.$outer.find('.lg-toolbar').append(zoomicons);

        // add zoomable class
        _this.core.$el.on('onslideitemload.lg.tm.zoom', function(event, index, delay) {

            // delay will be 0 except first time
            var _speed = _this.core.s.enablezoomafter + delay;

            // set _speed value 0 if gallery opened from direct url and if it is first slide
            if ($('body').hasclass('lg-from-hash') && delay) {

                // will execute only one time
                _speed = 0;
            } else {

                // remove lg-from-hash to enable starting animation.
                $('body').removeclass('lg-from-hash');
            }

            _this.zoomabletimeout = settimeout(function() {
                _this.core.$slide.eq(index).addclass('lg-zoomable');
            }, _speed + 30);
        });

        var scale = 1;
        /**
         * @desc image zoom
         * translate the wrap and scale the image to get better user experience
         *
         * @param {string} scaleval - zoom decrement/increment value
         * @param {boolean} db - true if zoom called via doubleclick
         * @todo currently zoom origin is center it should work from all the directions
         */
        var zoom = function(scaleval, db, pagex, pagey) {

            var $image = _this.core.$outer.find('.lg-current .lg-image');
            var _x;
            var _y;
            if (db) {
                _x = pagex - $image.offset().left;
                _y = pagey - $image.offset().top;
            } else {
                _x = $image.width() / 2;
                _y = $image.height() / 2;
            }

            var x = (scaleval - 1) * (_x);
            var y = (scaleval - 1) * (_y);

            $image.css('transform', 'scale3d(' + scaleval + ', ' + scaleval + ', 1)').attr('data-scale', scaleval);

            $image.parent().css('transform', 'translate3d(-' + x + 'px, -' + y + 'px, 0)').attr('data-x', x).attr('data-y', y);
        };

        var callscale = function(db, pagex, pagey) {
            if (scale > 1) {
                _this.core.$outer.addclass('lg-zoomed');
            } else {
                _this.core.$outer.removeclass('lg-zoomed');
            }

            if (scale < 1) {
                scale = 1;
            }

            zoom(scale, db, pagex, pagey);
        };

        // event triggered after appending slide content
        _this.core.$el.on('onaferappendslide.lg.tm.zoom', function(event, index) {

            // get the current element
            var $image = _this.core.$slide.eq(index).find('.lg-image');

            $image.dblclick(function(event) {

                var w = $image.width();
                var nw = _this.core.$items.eq(index).attr('data-width') || $image[0].naturalwidth || w;
                var _scale;

                if (_this.core.$outer.hasclass('lg-zoomed')) {
                    scale = 1;
                } else {
                    if (nw > w) {
                        _scale = nw / w;
                        scale = _scale || 2;
                    }
                }

                callscale(true, event.pagex, event.pagey);
                settimeout(function() {
                    _this.core.$outer.removeclass('lg-grabbing').addclass('lg-grab');
                }, 10);
            });

        });

        // update zoom on resize and orientationchange
        $(window).on('resize.lg.zoom orientationchange.lg.zoom', function() {
            settimeout(function() {
                if (_this.core.$outer.hasclass('lg-zoomed')) {
                    zoom(scale);
                }
            }, 10);
        });

        $('#lg-zoom-out').on('click.lg', function() {
            if (_this.core.$outer.find('.lg-current .lg-image').length) {
                scale -= _this.core.s.scale;
                callscale();
            }
        });

        $('#lg-zoom-in').on('click.lg', function() {
            if (_this.core.$outer.find('.lg-current .lg-image').length) {
                scale += _this.core.s.scale;
                callscale();
            }
        });

        // reset zoom on slide change
        _this.core.$el.on('onbeforeslide.lg.tm', function() {
            _this.resetzoom();
        });

        // drag option after zoom
        if (!_this.core.istouch) {
            _this.zoomdrag();
        }

        if (_this.core.istouch) {
            _this.zoomswipe();
        }

    };

    // reset zoom effect
    zoom.prototype.resetzoom = function() {
        this.core.$outer.removeclass('lg-zoomed');
        this.core.$slide.find('.lg-img-wrap').removeattr('style data-x data-y');
        this.core.$slide.find('.lg-image').removeattr('style data-scale');
    };

    zoom.prototype.zoomswipe = function() {
        var _this = this;
        var startcoords = {};
        var endcoords = {};
        var ismoved = false;

        // allow x direction drag
        var allowx = false;

        // allow y direction drag
        var allowy = false;

        _this.core.$slide.on('touchstart.lg', function(e) {

            if (_this.core.$outer.hasclass('lg-zoomed')) {
                var $image = _this.core.$slide.eq(_this.core.index).find('.lg-object');

                allowy = $image.outerheight() * $image.attr('data-scale') > _this.core.$outer.find('.lg').height();
                allowx = $image.outerwidth() * $image.attr('data-scale') > _this.core.$outer.find('.lg').width();
                if ((allowx || allowy)) {
                    e.preventdefault();
                    startcoords = {
                        x: e.originalevent.targettouches[0].pagex,
                        y: e.originalevent.targettouches[0].pagey
                    };
                }
            }

        });

        _this.core.$slide.on('touchmove.lg', function(e) {

            if (_this.core.$outer.hasclass('lg-zoomed')) {

                var _$el = _this.core.$slide.eq(_this.core.index).find('.lg-img-wrap');
                var distancex;
                var distancey;

                e.preventdefault();
                ismoved = true;
                endcoords = e.originalevent.targettouches[0].pagex;

                endcoords = {
                    x: e.originalevent.targettouches[0].pagex,
                    y: e.originalevent.targettouches[0].pagey
                };

                // reset opacity and transition duration
                _this.core.$outer.addclass('lg-zoom-dragging');

                if (allowy) {
                    distancey = (-math.abs(_$el.attr('data-y'))) + (endcoords.y - startcoords.y);
                } else {
                    distancey = -math.abs(_$el.attr('data-y'));
                }

                if (allowx) {
                    distancex = (-math.abs(_$el.attr('data-x'))) + (endcoords.x - startcoords.x);
                } else {
                    distancex = -math.abs(_$el.attr('data-x'));
                }

                _$el.css('transform', 'translate3d(' + distancex + 'px, ' + distancey + 'px, 0)');

            }

        });

        _this.core.$slide.on('touchend.lg', function() {
            if (_this.core.$outer.hasclass('lg-zoomed')) {
                if (ismoved) {
                    ismoved = false;
                    _this.core.$outer.removeclass('lg-zoom-dragging');
                    _this.touchendzoom(startcoords, endcoords, allowx, allowy);

                }
            }
        });

    };

    zoom.prototype.zoomdrag = function() {

        var _this = this;
        var startcoords = {};
        var endcoords = {};
        var isdraging = false;
        var ismoved = false;

        // allow x direction drag
        var allowx = false;

        // allow y direction drag
        var allowy = false;

        _this.core.$slide.on('mousedown.lg.zoom', function(e) {

            // execute only on .lg-object
            var $image = _this.core.$slide.eq(_this.core.index).find('.lg-object');

            allowy = $image.outerheight() * $image.attr('data-scale') > _this.core.$outer.find('.lg').height();
            allowx = $image.outerwidth() * $image.attr('data-scale') > _this.core.$outer.find('.lg').width();

            if (_this.core.$outer.hasclass('lg-zoomed')) {
                if ($(e.target).hasclass('lg-object') && (allowx || allowy)) {
                    e.preventdefault();
                    startcoords = {
                        x: e.pagex,
                        y: e.pagey
                    };

                    isdraging = true;

                    // ** fix for webkit cursor issue https://code.google.com/p/chromium/issues/detail?id=26723
                    _this.core.$outer.scrollleft += 1;
                    _this.core.$outer.scrollleft -= 1;

                    _this.core.$outer.removeclass('lg-grab').addclass('lg-grabbing');
                }
            }
        });

        $(window).on('mousemove.lg.zoom', function(e) {
            if (isdraging) {
                var _$el = _this.core.$slide.eq(_this.core.index).find('.lg-img-wrap');
                var distancex;
                var distancey;

                ismoved = true;
                endcoords = {
                    x: e.pagex,
                    y: e.pagey
                };

                // reset opacity and transition duration
                _this.core.$outer.addclass('lg-zoom-dragging');

                if (allowy) {
                    distancey = (-math.abs(_$el.attr('data-y'))) + (endcoords.y - startcoords.y);
                } else {
                    distancey = -math.abs(_$el.attr('data-y'));
                }

                if (allowx) {
                    distancex = (-math.abs(_$el.attr('data-x'))) + (endcoords.x - startcoords.x);
                } else {
                    distancex = -math.abs(_$el.attr('data-x'));
                }

                _$el.css('transform', 'translate3d(' + distancex + 'px, ' + distancey + 'px, 0)');
            }
        });

        $(window).on('mouseup.lg.zoom', function(e) {

            if (isdraging) {
                isdraging = false;
                _this.core.$outer.removeclass('lg-zoom-dragging');

                // fix for chrome mouse move on click
                if (ismoved && ((startcoords.x !== endcoords.x) || (startcoords.y !== endcoords.y))) {
                    endcoords = {
                        x: e.pagex,
                        y: e.pagey
                    };
                    _this.touchendzoom(startcoords, endcoords, allowx, allowy);

                }

                ismoved = false;
            }

            _this.core.$outer.removeclass('lg-grabbing').addclass('lg-grab');

        });
    };

    zoom.prototype.touchendzoom = function(startcoords, endcoords, allowx, allowy) {

        var _this = this;
        var _$el = _this.core.$slide.eq(_this.core.index).find('.lg-img-wrap');
        var $image = _this.core.$slide.eq(_this.core.index).find('.lg-object');
        var distancex = (-math.abs(_$el.attr('data-x'))) + (endcoords.x - startcoords.x);
        var distancey = (-math.abs(_$el.attr('data-y'))) + (endcoords.y - startcoords.y);
        var miny = (_this.core.$outer.find('.lg').height() - $image.outerheight()) / 2;
        var maxy = math.abs(($image.outerheight() * math.abs($image.attr('data-scale'))) - _this.core.$outer.find('.lg').height() + miny);
        var minx = (_this.core.$outer.find('.lg').width() - $image.outerwidth()) / 2;
        var maxx = math.abs(($image.outerwidth() * math.abs($image.attr('data-scale'))) - _this.core.$outer.find('.lg').width() + minx);

        if (allowy) {
            if (distancey <= -maxy) {
                distancey = -maxy;
            } else if (distancey >= -miny) {
                distancey = -miny;
            }
        }

        if (allowx) {
            if (distancex <= -maxx) {
                distancex = -maxx;
            } else if (distancex >= -minx) {
                distancex = -minx;
            }
        }

        if (allowy) {
            _$el.attr('data-y', math.abs(distancey));
        } else {
            distancey = -math.abs(_$el.attr('data-y'));
        }

        if (allowx) {
            _$el.attr('data-x', math.abs(distancex));
        } else {
            distancex = -math.abs(_$el.attr('data-x'));
        }

        _$el.css('transform', 'translate3d(' + distancex + 'px, ' + distancey + 'px, 0)');
    };

    zoom.prototype.destroy = function() {

        var _this = this;

        // unbind all events added by lightgallery zoom plugin
        _this.core.$el.off('.lg.zoom');
        $(window).off('.lg.zoom');
        _this.core.$slide.off('.lg.zoom');
        _this.core.$el.off('.lg.tm.zoom');
        _this.resetzoom();
        cleartimeout(_this.zoomabletimeout);
        _this.zoomabletimeout = false;
    };

    $.fn.lightgallery.modules.zoom = zoom;

})(jquery, window, document);