QUnit.config.autostart = false;

(function () {
    var viewer = null;
    var displayRegion = null;
    var navigator = null;
    var navigatorAspectRatio = null;
    var leftScalingFactor = null;
    var maxHeightFactor = null;
    var spaceFromLeftEdgeOfViewerToContentStart = null;
    var spaceFromTopEdgeOfViewerToContentStart = null;
    var widthOfViewerContentOnNavigator = null;
    var heightOfViewerContentOnNavigator = null;

    module("navigator", {
        setup:function () {
            resetDom();
            resetTestVariables();
        }
    });

    $(document).ready(function () {
        start();
    });

    var resetTestVariables = function()
    {
         if (viewer != null) {
             viewer.close();
         }
         displayRegion = null;
         navigator = null;
         navigatorAspectRatio = null;
         leftScalingFactor = null;
         maxHeightFactor = null;
         spaceFromLeftEdgeOfViewerToContentStart = null;
         spaceFromTopEdgeOfViewerToContentStart = null;
         widthOfViewerContentOnNavigator = null;
         heightOfViewerContentOnNavigator = null;
    };

    var resetDom = function()
    {
        if ($('#exampleNavigator').is(':ui-dialog')) {
            $('#exampleNavigator').dialog('destroy');
        }
        $("#exampleNavigator").remove();
        $(".navigator").remove();
        $("#example").empty();
        $("#tallexample").empty();
        $("#wideexample").empty();
        $("#example").parent().append('<div id="exampleNavigator"></div>');
    };

    var equalsWithSomeVariance = function (value1, value2, variance) {
        return Math.abs(value1 - value2) <= variance;
    };


    var assessNumericValueWithSomeVariance = function (value1, value2, variance, message) {
        ok(equalsWithSomeVariance(value1, value2, variance), message + " Expected:" + value1 + " Found: " + value2 + " Variance: " + variance);
    };

    var assessNavigatorLocation = function (expectedX, expectedY) {
        var navigator = $(".navigator");

        assessNumericValueWithSomeVariance(expectedX, navigator.offset().left, 4, ' Navigator x position');
        assessNumericValueWithSomeVariance(expectedY, navigator.offset().top, 4, ' Navigator y position');
    };

    var navigatorRegionBoundsInPoints = function ()
    {
        var regionBoundsInPoints;
        if (navigator === null)
        {
            maxHeightFactor = 1;
            navigator = $(".navigator");
            navigatorAspectRatio = navigator.height() /navigator.width();
            leftScalingFactor = navigatorAspectRatio * viewer.source.aspectRatio;
            if (viewer.source.aspectRatio < 1)
            {
                if (viewer.source.aspectRatio < navigatorAspectRatio)
                {
                    maxHeightFactor =  viewer.source.aspectRatio * navigatorAspectRatio;
                }
                else
                {
                    maxHeightFactor =  viewer.source.aspectRatio;
                }
                spaceFromLeftEdgeOfViewerToContentStart = ((1/maxHeightFactor)-1) / 2 * maxHeightFactor * navigator.width();
                spaceFromTopEdgeOfViewerToContentStart = 0;
            }
            else
            {
                if (viewer.source.aspectRatio < navigatorAspectRatio)
                {
                    spaceFromTopEdgeOfViewerToContentStart =  (navigatorAspectRatio - (1/viewer.source.aspectRatio)) / 2 /navigatorAspectRatio * navigator.height();
                }
                else
                {
                    spaceFromTopEdgeOfViewerToContentStart =  (navigatorAspectRatio - (1/viewer.source.aspectRatio)) / 2 /navigatorAspectRatio * navigator.height();
                    leftScalingFactor = 1;
                }
            }
            widthOfViewerContentOnNavigator = navigator.width() - 2 * spaceFromLeftEdgeOfViewerToContentStart;
            heightOfViewerContentOnNavigator = navigator.height() - 2 * spaceFromTopEdgeOfViewerToContentStart;
        }

        var expectedDisplayRegionWidth = navigator.width() / viewer.viewport.getZoom() * maxHeightFactor;
        var expectedDisplayRegionHeight = navigator.height() / viewer.viewport.getZoom() * maxHeightFactor;
        var expectedDisplayRegionXLocation = viewer.viewport.getBounds().x * maxHeightFactor * navigator.width()   + spaceFromLeftEdgeOfViewerToContentStart;
        var expectedDisplayRegionYLocation = viewer.viewport.getBounds().y *  leftScalingFactor * navigator.width()  + spaceFromTopEdgeOfViewerToContentStart ;
        regionBoundsInPoints = new OpenSeadragon.Rect(expectedDisplayRegionXLocation,expectedDisplayRegionYLocation,expectedDisplayRegionWidth,expectedDisplayRegionHeight);


        return regionBoundsInPoints;

    };

    var assessNavigatorDisplayRegionAndMainViewerState = function (status) {

        var expectedBounds = navigatorRegionBoundsInPoints();
        assessNumericValueWithSomeVariance(expectedBounds.width, displayRegion.width() + viewer.navigator.totalBorderWidths.x, 2, status + ' Width synchronization');
        assessNumericValueWithSomeVariance(expectedBounds.height, displayRegion.height() + viewer.navigator.totalBorderWidths.y, 2, status + ' Height synchronization');
        assessNumericValueWithSomeVariance(expectedBounds.x, displayRegion.position().left, 2, status + ' Left synchronization');
        assessNumericValueWithSomeVariance(expectedBounds.y, displayRegion.position().top, 2, status + ' Top synchronization');
    };

    var waitForViewer = function () {
        return function () {
            return function (handler, count, lastDisplayRegionLeft, lastDisplayWidth) {
                var currentDisplayRegionLeft;
                var currentDisplayWidth;
                if (displayRegion === null)
                {
                    displayRegion = $(".displayregion");
                }
                var viewerAndNavigatorDisplayReady = false;
                if (typeof count !== "number") {
                    count = 0;
                    lastDisplayRegionLeft = null;
                    lastDisplayWidth = null;
                }
                    try
                    {
                        currentDisplayRegionLeft =  displayRegion.position().left;
                        currentDisplayWidth =  displayRegion.width();
                        viewerAndNavigatorDisplayReady = viewer.drawer !== null &&
                            !viewer.drawer.needsUpdate() &&
                            currentDisplayWidth > 0 &&
                            equalsWithSomeVariance(lastDisplayRegionLeft, currentDisplayRegionLeft,.0001) &&
                                           equalsWithSomeVariance(lastDisplayWidth,currentDisplayWidth,.0001) &&
                                           equalsWithSomeVariance(viewer.viewport.getBounds(true).x,viewer.viewport.getBounds().x,.0001) &&
                                           equalsWithSomeVariance(viewer.viewport.getBounds(true).y,viewer.viewport.getBounds().y,.0001) &&
                                           equalsWithSomeVariance(viewer.viewport.getBounds(true).width,viewer.viewport.getBounds().width,.0001);
                    }
                    catch(err)
                    {
                        //Ignore.  Subsequent code will try again shortly
                    }
                if (( !viewerAndNavigatorDisplayReady) && count < 50) {
                    count++;
                    setTimeout(function () {waitForViewer(handler, count, currentDisplayRegionLeft, currentDisplayWidth);}, 100)
                }
                else {
                    if (count === 40)
                    {
                    console.log( "waitForViewer:" +
                                  viewer.drawer + ":" + viewer.drawer.needsUpdate()  + ":" +
                                  viewerAndNavigatorDisplayReady + ":" +
                                  lastDisplayRegionLeft + ":" + currentDisplayRegionLeft + ":" +
                                  lastDisplayWidth + ":" + currentDisplayWidth + ":"  +
                                  viewer.viewport.getBounds(true).x + ":" + viewer.viewport.getBounds().x + ":" +
                                  viewer.viewport.getBounds(true).y + ":" + viewer.viewport.getBounds().y + ":" +
                                  viewer.viewport.getBounds(true).width + ":" + viewer.viewport.getBounds().width + ":"  +
                                  count );
                    }
                    handler();
                }
            };
        }();
    }();

    var simulateNavigatorClick = function(viewer, locationX, locationY) {
        var $canvas = $(viewer.element).find('.openseadragon-canvas');
        var offset = $canvas.offset();
        var event = {
            clientX: offset.left +  locationX,
            clientY: offset.top +  locationY
        };

        $canvas
            .simulate('mouseover', event)
            .simulate('mousedown', event)
            .simulate('mouseup', event);
    };

    var simulateNavigatorDrag = function(viewer, distanceX, distanceY) {
        var $canvas = $(viewer.element).find('.displayregion');
        var event = {
            dx: Math.floor(distanceX),
            dy: Math.floor(distanceY)
        };

        $canvas
            .simulate('drag', event);
    };

    var assessViewerInCorner = function(theContentCorner)
    {
       var expectedXCoordinate, expecteYCoordinate;
       if (theContentCorner === "TOPLEFT")
       {
           expectedXCoordinate = 0;
           expecteYCoordinate = 0;
       }
       else if (theContentCorner === "TOPRIGHT")
       {
           expectedXCoordinate = 1-viewer.viewport.getBounds().width;
           expecteYCoordinate = 0;
       }
       else if (theContentCorner === "BOTTOMRIGHT")
       {
           expectedXCoordinate = 1-viewer.viewport.getBounds().width;
           expecteYCoordinate = 1/viewer.source.aspectRatio/2 - viewer.viewport.getBounds().height;
       }
       else if (theContentCorner === "BOTTOMLEFT")
       {
           expectedXCoordinate = 0;
           expecteYCoordinate = 1/viewer.source.aspectRatio/2 - viewer.viewport.getBounds().height;
       }
        if (viewer.viewport.getBounds().width < 1)
        {
            assessNumericValueWithSomeVariance(expectedXCoordinate, viewer.viewport.getBounds().x,.04, ' Viewer at ' + theContentCorner + ', x coord');
        }
        if (viewer.viewport.getBounds().height < 1/viewer.source.aspectRatio)
        {
            assessNumericValueWithSomeVariance(expecteYCoordinate, viewer.viewport.getBounds().y,.04, ' Viewer at ' + theContentCorner + ', y coord');
        }
    };

    var assessViewerInCenter = function()
    {
        var yPositionVariance = .04;
        if (viewer.source.aspectRatio < 1)
        {
            yPositionVariance = yPositionVariance / viewer.source.aspectRatio;
        }
        assessNumericValueWithSomeVariance(1/viewer.source.aspectRatio/2, viewer.viewport.getCenter().y,yPositionVariance, ' Viewer at center, y coord');
        assessNumericValueWithSomeVariance(.5, viewer.viewport.getCenter().x,.4, ' Viewer at center, x coord');
    };


    var clickOnNavigator = function(theContentCorner)
    {
       var xPos, yPos;
       if (theContentCorner === "TOPLEFT")
       {
           xPos = spaceFromLeftEdgeOfViewerToContentStart;
           yPos = spaceFromTopEdgeOfViewerToContentStart;
       }
       else if (theContentCorner === "TOPRIGHT")
       {
           xPos = spaceFromLeftEdgeOfViewerToContentStart + widthOfViewerContentOnNavigator;
           yPos = spaceFromTopEdgeOfViewerToContentStart;
       }
       else if (theContentCorner === "BOTTOMRIGHT")
       {
           xPos = spaceFromLeftEdgeOfViewerToContentStart + widthOfViewerContentOnNavigator;
           yPos = spaceFromTopEdgeOfViewerToContentStart + heightOfViewerContentOnNavigator;
       }
       else if (theContentCorner === "BOTTOMLEFT")
       {
           xPos = spaceFromLeftEdgeOfViewerToContentStart;
           yPos = spaceFromTopEdgeOfViewerToContentStart + heightOfViewerContentOnNavigator;
       }
        simulateNavigatorClick(viewer.navigator, xPos, yPos);
    };

    var dragNavigatorBackToCenter = function()
    {
        var start = viewer.viewport.getBounds().getTopLeft();
        var target = new OpenSeadragon.Point(0.5 - viewer.viewport.getBounds().width/2,
                                             1/viewer.source.aspectRatio/2 - viewer.viewport.getBounds().height/2);
        var delta = target.minus(start);
        if (viewer.source.aspectRatio < 1)
        {
            {
                delta.y = delta.y *  viewer.source.aspectRatio;
            }
        }
        simulateNavigatorDrag(viewer.navigator, delta.x * widthOfViewerContentOnNavigator, delta.y * heightOfViewerContentOnNavigator);
    };

    var assessNavigatorViewerPlacement = function (seadragonProperties, testProperties) {
        seadragonProperties.visibilityRatio = 1;
        viewer = OpenSeadragon(seadragonProperties);

        var assessAfterDragNavigatorFromTopRight = function() {
               assessNavigatorDisplayRegionAndMainViewerState("After drag on navigator");
               assessViewerInCenter();
               start();
       };

         var assessAfterClickOnNavigatorTopRight = function() {
             assessNavigatorDisplayRegionAndMainViewerState("After click on navigator");
             assessViewerInCorner("TOPRIGHT");
             dragNavigatorBackToCenter();
             waitForViewer(assessAfterDragNavigatorFromTopRight);
        };

        var assessAfterDragOnViewer = function () {
            assessNavigatorDisplayRegionAndMainViewerState("After pan");
            clickOnNavigator("TOPRIGHT");
            waitForViewer(assessAfterClickOnNavigatorTopRight);
        };

        var assessAfterZoomOnViewer = function () {
            var target = new OpenSeadragon.Point(0.4, 0.4);
            assessNavigatorDisplayRegionAndMainViewerState("After image zoom");
            viewer.viewport.panTo(target);
            waitForViewer(assessAfterDragOnViewer);
        };

        var captureInitialStateAfterOpenAndThenAct = function () {
            assessNavigatorDisplayRegionAndMainViewerState("After image load");

            testProperties.determineExpectationsAndAssessNavigatorLocation(seadragonProperties, testProperties);

            viewer.viewport.zoomTo(viewer.viewport.getZoom() * 2);
            waitForViewer(assessAfterZoomOnViewer);
        };

        var openHandler = function () {
            viewer.removeHandler('open', openHandler);
            waitForViewer(captureInitialStateAfterOpenAndThenAct);
        };

        viewer.addHandler('open', openHandler);

    };

    asyncTest('ZoomAndDragOnCustomNavigatorLocation', function () {
        assessNavigatorViewerPlacement({
                id:'example',
                navigatorId:'exampleNavigator',
                prefixUrl:'/build/openseadragon/images/',
                tileSources:'/test/data/testpattern.dzi',
                showNavigator:true
            },
            {
                displayRegionLocator:'#exampleNavigator .displayregion',
                navigatorLocator:'#exampleNavigator',
                determineExpectationsAndAssessNavigatorLocation:function (seadragonProperties, testProperties) {
                    var mainViewerElement = $("#" + seadragonProperties.id);
                    assessNavigatorLocation(mainViewerElement.offset().left,
                        mainViewerElement.offset().top + mainViewerElement.height());
                }
            });
    });

    asyncTest('DefaultNavigatorLocation', function () {
        assessNavigatorViewerPlacement({
                id:'example',
                prefixUrl:'/build/openseadragon/images/',
                tileSources:'/test/data/testpattern.dzi',
                showNavigator:true
            },
            {
                displayRegionLocator:'.navigator .displayregion',
                navigatorLocator:'.navigator',
                determineExpectationsAndAssessNavigatorLocation:function (seadragonProperties, testProperties) {
                    var mainViewerElement = $("#" + seadragonProperties.id);
                    var navigatorElement = $(testProperties.navigatorLocator);
                    assessNavigatorLocation(mainViewerElement.offset().left + mainViewerElement.width() - navigatorElement.width(),
                        mainViewerElement.offset().top);
                }
            });
    });

    asyncTest('NavigatorOnJQueryDialog', function () {
        $('#exampleNavigator').dialog();
        assessNavigatorViewerPlacement({
                id:'example',
                navigatorId:'exampleNavigator',
                prefixUrl:'/build/openseadragon/images/',
                tileSources:'/test/data/testpattern.dzi',
                showNavigator:true
            },
            {
                displayRegionLocator:'#exampleNavigator .displayregion',
                navigatorLocator:'#exampleNavigator',
                determineExpectationsAndAssessNavigatorLocation:function (seadragonProperties, testProperties) {
                    var jqueryDialog = $(testProperties.navigatorLocator);
                    assessNavigatorLocation(jqueryDialog.offset().left,
                        jqueryDialog.offset().top);
                }
            });
    });

    asyncTest('DefaultNavigatorLocationWithWideImageSquareViewer', function () {
        assessNavigatorViewerPlacement({
                id:'example',
                prefixUrl:'/build/openseadragon/images/',
                tileSources:'/test/data/wide.dzi',
                showNavigator:true
            },
            {
                displayRegionLocator:'.navigator .displayregion',
                navigatorLocator:'.navigator',
                determineExpectationsAndAssessNavigatorLocation:function (seadragonProperties, testProperties) {
                    var mainViewerElement = $("#" + seadragonProperties.id);
                    var navigatorElement = $(testProperties.navigatorLocator);
                    assessNavigatorLocation(mainViewerElement.offset().left + mainViewerElement.width() - navigatorElement.width(),
                        mainViewerElement.offset().top);
                }
            });
    });

    asyncTest('DefaultNavigatorLocationWithWideImageTallViewer', function () {
        assessNavigatorViewerPlacement({
                id:'tallexample',
                prefixUrl:'/build/openseadragon/images/',
                tileSources:'/test/data/wide.dzi',
                showNavigator:true
            },
            {
                displayRegionLocator:'.navigator .displayregion',
                navigatorLocator:'.navigator',
                determineExpectationsAndAssessNavigatorLocation:function (seadragonProperties, testProperties) {
                    var mainViewerElement = $("#" + seadragonProperties.id);
                    var navigatorElement = $(testProperties.navigatorLocator);
                    assessNavigatorLocation(mainViewerElement.offset().left + mainViewerElement.width() - navigatorElement.width(),
                        mainViewerElement.offset().top);
                }
            });
    });

    asyncTest('DefaultNavigatorLocationWithWideImageWideViewer', function () {
        assessNavigatorViewerPlacement({
                id:'wideexample',
                prefixUrl:'/build/openseadragon/images/',
                tileSources:'/test/data/wide.dzi',
                showNavigator:true
            },
            {
                displayRegionLocator:'.navigator .displayregion',
                navigatorLocator:'.navigator',
                determineExpectationsAndAssessNavigatorLocation:function (seadragonProperties, testProperties) {
                    var mainViewerElement = $("#" + seadragonProperties.id);
                    var navigatorElement = $(testProperties.navigatorLocator);
                    assessNavigatorLocation(mainViewerElement.offset().left + mainViewerElement.width() - navigatorElement.width(),
                        mainViewerElement.offset().top);
                }
            });
    });

    asyncTest('DefaultNavigatorLocationWithTallImageSquareViewer', function () {
        assessNavigatorViewerPlacement({
                id:'example',
                prefixUrl:'/build/openseadragon/images/',
                tileSources:'/test/data/tall.dzi',
                showNavigator:true
            },
            {
                displayRegionLocator:'.navigator .displayregion',
                navigatorLocator:'.navigator',
                determineExpectationsAndAssessNavigatorLocation:function (seadragonProperties, testProperties) {
                    var mainViewerElement = $("#" + seadragonProperties.id);
                    var navigatorElement = $(testProperties.navigatorLocator);
                    assessNavigatorLocation(mainViewerElement.offset().left + mainViewerElement.width() - navigatorElement.width(),
                        mainViewerElement.offset().top);
                }
            });
    });

    asyncTest('DefaultNavigatorLocationWithTallImageTallViewer', function () {
        assessNavigatorViewerPlacement({
                id:'tallexample',
                prefixUrl:'/build/openseadragon/images/',
                tileSources:'/test/data/tall.dzi',
                showNavigator:true
            },
            {
                displayRegionLocator:'.navigator .displayregion',
                navigatorLocator:'.navigator',
                determineExpectationsAndAssessNavigatorLocation:function (seadragonProperties, testProperties) {
                    var mainViewerElement = $("#" + seadragonProperties.id);
                    var navigatorElement = $(testProperties.navigatorLocator);
                    assessNavigatorLocation(mainViewerElement.offset().left + mainViewerElement.width() - navigatorElement.width(),
                        mainViewerElement.offset().top);
                }
            });
    });

    asyncTest('DefaultNavigatorLocationWithTallImageWideViewer', function () {
        assessNavigatorViewerPlacement({
                id:'wideexample',
                prefixUrl:'/build/openseadragon/images/',
                tileSources:'/test/data/tall.dzi',
                showNavigator:true
            },
            {
                displayRegionLocator:'.navigator .displayregion',
                navigatorLocator:'.navigator',
                determineExpectationsAndAssessNavigatorLocation:function (seadragonProperties, testProperties) {
                    var mainViewerElement = $("#" + seadragonProperties.id);
                    var navigatorElement = $(testProperties.navigatorLocator);
                    assessNavigatorLocation(mainViewerElement.offset().left + mainViewerElement.width() - navigatorElement.width(),
                        mainViewerElement.offset().top);
                }
            });
    });


    //Try with different navigator locations, in a jquery dialog and in a default location
    //Test whether showNavigator works
    //Test whether the initial locations works

    //Other tests that require additional sample images
    //Switch content, make sure things work

    //Other tests that require a reasonable event simulation approach
    //Test autohide
    //Operate on the navigator


})();