import CameraAccess from '../../src/input/camera_access';

var originalURL,
    originalMediaStreamTrack,
    video,
    stream;

describe("CameraAccess", () => {
    beforeEach(function() {
        var tracks = [{
            stop: function() {}
        }];

        originalURL = window.URL;
        originalMediaStreamTrack = window.MediaStreamTrack;
        window.MediaStreamTrack = {};
        window.URL = {
            createObjectURL() {
                return stream;
            }
        };

        stream = {
            getVideoTracks: function() {
                return tracks;
            }
        };
        sinon.spy(tracks[0], "stop");

        video = {
            srcObject: null,
            addEventListener: function() {},
            removeEventListener: function() {},
            setAttribute: sinon.spy(),
            play: function() {},
            videoWidth: 320,
            videoHeight: 480
        };
        sinon.stub(video, "addEventListener", function(event, cb) {
            cb();
        });
        sinon.stub(video, "play");
    });

    afterEach(function() {
        window.URL = originalURL;
        window.MediaStreamTrack = originalMediaStreamTrack;
    });

    describe('success', function() {
        beforeEach(function() {
            sinon.stub(navigator.mediaDevices, "getUserMedia", function(constraints) {
                return Promise.resolve(stream);
            });
        });

        afterEach(function() {
            navigator.mediaDevices.getUserMedia.restore();
        });
        describe('request', function () {
            it('should request the camera', function (done) {
                CameraAccess.request(video, {})
                .then(function () {
                    expect(navigator.mediaDevices.getUserMedia.calledOnce).to.equal(true);
                    expect(video.srcObject).to.deep.equal(stream);
                    done();
                });
            });

            it("should allow deprecated constraints to be used", (done) => {
                CameraAccess.request(video, {
                    width: 320,
                    height: 240,
                    facing: "user",
                    minAspectRatio: 2,
                    maxAspectRatio: 100
                })
                .then(function () {
                    const call = navigator.mediaDevices.getUserMedia.getCall(0),
                        args = call.args;
                    expect(call).to.be.defined;
                    expect(args[0].video.width).to.equal(320);
                    expect(args[0].video.height).to.equal(240);
                    expect(args[0].video.facingMode).to.equal("user");
                    expect(args[0].video.aspectRatio).to.equal(2);
                    expect(args[0].video.facing).not.to.be.defined;
                    expect(args[0].video.minAspectRatio).not.to.be.defined;
                    expect(args[0].video.maxAspectRatio).not.to.be.defined;
                    done();
                });
            });
        });

        it('should release the camera', function (done) {
            CameraAccess.request(video, {})
            .then(function () {
                expect(video.srcObject).to.deep.equal(stream);
                CameraAccess.release();
                expect(video.srcObject.getVideoTracks()).to.have.length(1);
                expect(video.srcObject.getVideoTracks()[0].stop.calledOnce).to.equal(true);
                done();
            });
        });
    });

    describe('failure', function() {
        describe("permission denied", function(){
            beforeEach(function() {
                sinon.stub(navigator.mediaDevices, "getUserMedia", function(constraints, success, failure) {
                    return Promise.reject(new Error());
                });
            });

            afterEach(function() {
                navigator.mediaDevices.getUserMedia.restore();
            });

            it('should throw if getUserMedia not available', function(done) {
                CameraAccess.request(video, {})
                .catch(function (err) {
                    expect(err).to.be.defined;
                    done();
                });
            });
        });

        describe("not available", function(){
            var originalGetUserMedia;

            beforeEach(function() {
                originalGetUserMedia = navigator.mediaDevices.getUserMedia;
                navigator.mediaDevices.getUserMedia = undefined;
            });

            afterEach(function() {
                navigator.mediaDevices.getUserMedia = originalGetUserMedia;
            });

            it('should throw if getUserMedia not available', function(done) {
                CameraAccess.request(video, {})
                .catch((err) => {
                    expect(err).to.be.defined;
                    done();
                });
            });
        });
    });
});