angular.module('superdesk.core.upload').directive('sdVideoCapture', [function() {
    var URL = window.URL || window.webkitURL;

    navigator['getMedia'] = navigator.getUserMedia ||
        navigator['webkitGetUserMedia'] ||
        navigator['mozGetUserMedia'] ||
        navigator['msGetUserMedia'];

    return {
        scope: {
            sdVideoCapture: '=',
            file: '=',
        },
        link: function(scope, elem) {
            var localMediaStream = null,
                canvas = angular.element('<canvas style="display:none"></canvas>'),
                ctx = canvas[0].getContext('2d'),
                tooLate = false;

            elem.after(canvas);

            navigator['getMedia']({
                video: true,
                audio: false,
            }, (stream) => {
                if (tooLate) {
                    stream.stop();
                    return;
                }

                localMediaStream = stream;
                if (navigator['mozGetUserMedia']) {
                    elem[0].mozSrcObject = stream;
                } else {
                    elem[0].src = URL.createObjectURL(stream);
                }
            }, (err) => {
                console.error('There was an error when getting media: ' + err);
            });

            elem.click((e) => {
                var img = elem[0];

                canvas[0].width = img.videoWidth;
                canvas[0].height = img.videoHeight;
                ctx.drawImage(img, 0, 0);

                // todo(petr): use canvas.toBlog once available in chrome
                scope.$apply(() => {
                    scope.sdVideoCapture = canvas[0].toDataURL('image/jpeg', 0.95);
                });
            });

            scope.$on('$destroy', () => {
                try {
                    tooLate = true;
                    elem[0].pause();
                    localMediaStream.stop();
                } catch (err) {
                    // no-op
                }
            });
        },
    };
}]);