var jcropapi;

function setupJcrop(image, original, focalPointOriginal, fields) {
    image.Jcrop({
        trueSize: [original.width, original.height],
        bgColor: 'rgb(192, 192, 192)',
        onSelect: function(box) {
            var x = Math.floor((box.x + box.x2) / 2);
            var y = Math.floor((box.y + box.y2) / 2);
            var w = Math.floor(box.w);
            var h = Math.floor(box.h);

            fields.x.val(x);
            fields.y.val(y);
            fields.width.val(w);
            fields.height.val(h);
        },

        onRelease: function() {
            fields.x.val(focalPointOriginal.x);
            fields.y.val(focalPointOriginal.y);
            fields.width.val(focalPointOriginal.width);
            fields.height.val(focalPointOriginal.height);
        }
    }, function() {
        jcropapi = this

        // Set alt="" on the image so its src is not read out loud to screen reader users.
        var $holderImage = $('img', jcropapi.ui.holder);
        $holderImage.attr('alt', '');
    });
}

$(function() {
    var $chooser = $('div.focal-point-chooser');
    var $indicator = $('.current-focal-point-indicator', $chooser);
    var $image = $('img', $chooser);

    var original = {
        width: $image.data('originalWidth'),
        height: $image.data('originalHeight')
    }

    var focalPointOriginal = {
        x: $chooser.data('focalPointX'),
        y: $chooser.data('focalPointY'),
        width: $chooser.data('focalPointWidth'),
        height: $chooser.data('focalPointHeight')
    }

    var fields = {
        x: $('input.focal_point_x'),
        y: $('input.focal_point_y'),
        width: $('input.focal_point_width'),
        height: $('input.focal_point_height')
    }

    var left = focalPointOriginal.x - focalPointOriginal.width / 2
    var top = focalPointOriginal.y - focalPointOriginal.height / 2
    var width = focalPointOriginal.width;
    var height = focalPointOriginal.height;

    $indicator.css('left', (left * 100 / original.width) + '%');
    $indicator.css('top', (top * 100 / original.height) + '%');
    $indicator.css('width', (width * 100 / original.width) + '%');
    $indicator.css('height', (height * 100 / original.height) + '%');

    var params = [$image, original, focalPointOriginal, fields];

    setupJcrop.apply(this, params)

    $(window).on('resize', $.debounce(300, function() {
        // jcrop doesn't support responsive images so to cater for resizing the browser
        // we have to destroy() it, which doesn't properly do it,
        // so destory it some more, then re-apply it
        jcropapi.destroy();
        $image.removeAttr('style');
        $('.jcrop-holder').remove();
        setupJcrop.apply(this, params)
    }));

    $('.remove-focal-point').on('click', function() {
        jcropapi.destroy();
        $image.removeAttr('style');
        $('.jcrop-holder').remove();
        $('.current-focal-point-indicator').remove();
        fields.x.val('');
        fields.y.val('');
        fields.width.val('');
        fields.height.val('');
        setupJcrop.apply(this, params);
    });
});
