(function () {
    var ns = $.namespace("pskl.controller");
    ns.PreviewFilmController = function (framesheet, container, dpi) {

        this.framesheet = framesheet;
        this.container = container;
        this.dpi = this.calculateDPI_();

        this.redrawFlag = true;

        $.subscribe(Events.TOOL_RELEASED, this.flagForRedraw_.bind(this));
        $.subscribe(Events.FRAMESHEET_RESET, this.flagForRedraw_.bind(this));
        $.subscribe(Events.FRAMESHEET_RESET, this.refreshDPI_.bind(this));
    };

    ns.PreviewFilmController.prototype.init = function() {
        var addFrameButton = $('#add-frame-button')[0];
        addFrameButton.addEventListener('mousedown', this.addFrame.bind(this));
    };

    ns.PreviewFilmController.prototype.addFrame = function () {
        this.framesheet.addEmptyFrame();
        this.framesheet.setCurrentFrameIndex(this.framesheet.getFrameCount() - 1);
    };

    ns.PreviewFilmController.prototype.flagForRedraw_ = function () {
        this.redrawFlag = true;
    };

    ns.PreviewFilmController.prototype.refreshDPI_ = function () {
        this.dpi = this.calculateDPI_();
    };

    ns.PreviewFilmController.prototype.render = function () {
        if (this.redrawFlag) {
            // TODO(vincz): Full redraw on any drawing modification, optimize.
            this.createPreviews_();
            this.redrawFlag = false;
        }
    };

    ns.PreviewFilmController.prototype.createPreviews_ = function () {
        
        this.container.html("");
        // Manually remove tooltips since mouseout events were shortcut by the DOM refresh:
        $(".tooltip").remove();

        var frameCount = this.framesheet.getFrameCount();

        for (var i = 0, l = frameCount; i < l ; i++) {
            this.container.append(this.createInterstitialTile_(i));
            this.container.append(this.createPreviewTile_(i));
        }
        this.container.append(this.createInterstitialTile_(frameCount));

        var needDragndropBehavior = (frameCount > 1) ? true : false;
        if(needDragndropBehavior) {
            this.initDragndropBehavior_();
        }
    };

    /**
     * @private
     */
    ns.PreviewFilmController.prototype.createInterstitialTile_ = function (tileNumber) {
        var interstitialTile = document.createElement("div");
        interstitialTile.className = "interstitial-tile";
        interstitialTile.setAttribute("data-tile-type", "interstitial");
        interstitialTile.setAttribute("data-inject-drop-tile-at", tileNumber);

        return interstitialTile;
    };

    /**
     * @private
     */
    ns.PreviewFilmController.prototype.initDragndropBehavior_ = function () {
        var tiles = $(".preview-tile");
        // Each preview film tile is draggable.
        tiles.draggable( {
          //containment: '.left-nav',
          stack: '.preview-tile',
          cursor: 'move',
          revert: true,
          start: function(event, ui) {
            // We only show the fake interstitial tiles when starting the 
            // drag n drop interaction. We hide them when the DnD is done.
            $('#preview-list').addClass("show-interstitial-tiles");
          },
          stop: function() {
            $('#preview-list').removeClass("show-interstitial-tiles");
          }
        });


        // Each preview film tile is a drop target. This allow us to swap two tiles.
        // However, we want to be able to insert a tile between two other tiles.
        // For that we created fake interstitial tiles that are used as drop targets as well.
        var droppableTiles = $(".interstitial-tile");
        $.merge(droppableTiles, tiles);

        droppableTiles.droppable( {
            accept: ".preview-tile",
            tolerance: "pointer",
            activeClass: "droppable-active",
            hoverClass: "droppable-hover-active",
            drop: $.proxy(this.onDrop_, this)
        });
    };

    /**
     * @private
     */
    ns.PreviewFilmController.prototype.onDrop_ = function( event, ui ) {
        var activeFrame;
        // When we drag from an element, the drag could start from a nested DOM element
        // inside the drag target. We normalize that by taking the correct ancestor:
        var originTile = $(event.srcElement).closest(".preview-tile");
        var originFrameId = parseInt(originTile.data("tile-number"), 10);

        var dropTarget = $(event.target);
        if(dropTarget.data("tile-type") == "interstitial") {
            var targetInsertionId = parseInt(dropTarget.data("inject-drop-tile-at"), 10);
            // In case we drop outside of the tile container
            if(isNaN(originFrameId) || isNaN(targetInsertionId)) {
                return;
            }
            //console.log("origin-frame: "+originFrameId+" - targetInsertionId: "+ targetInsertionId)
            this.framesheet.moveFrame(originFrameId, targetInsertionId);
            
            activeFrame = targetInsertionId;
            // The last fake interstitial tile is outside of the framesheet array bound.
            // It allow us to append after the very last element in this fake slot.
            // However, when setting back the active frame, we have to make sure the 
            // frame does exist.
            if(activeFrame > (this.framesheet.getFrameCount() - 1)) {
                activeFrame = targetInsertionId - 1;
            }
        } else {
            var targetSwapId = parseInt(dropTarget.data("tile-number"), 10);
            // In case we drop outside of the tile container
            if(isNaN(originFrameId) || isNaN(targetSwapId)) {
                return;
            }
            //console.log("origin-frame: "+originFrameId+" - targetSwapId: "+ targetSwapId)
            this.framesheet.swapFrames(originFrameId, targetSwapId);
            activeFrame = targetSwapId;
        }

        
        $('#preview-list').removeClass("show-interstitial-tiles");

        this.framesheet.setCurrentFrameIndex(activeFrame);

        // TODO(vincz): move localstorage request to the model layer?
        $.publish(Events.LOCALSTORAGE_REQUEST);
    };

    /**
     * @private
     * TODO(vincz): clean this giant rendering function & remove listeners.
     */
    ns.PreviewFilmController.prototype.createPreviewTile_ = function(tileNumber) {
        var currentFrame = this.framesheet.getFrameByIndex(tileNumber);
        
        var previewTileRoot = document.createElement("li");
        var classname = "preview-tile";
        previewTileRoot.setAttribute("data-tile-number", tileNumber);

        if (this.framesheet.getCurrentFrame() == currentFrame) {
            classname += " selected";
        }
        previewTileRoot.className = classname;

        var canvasContainer = document.createElement("div");
        canvasContainer.className = "canvas-container";
        
        var canvasBackground = document.createElement("div");
        canvasBackground.className = "canvas-background";
        canvasContainer.appendChild(canvasBackground);
        
        previewTileRoot.addEventListener('click', this.onPreviewClick_.bind(this, tileNumber));

        var actionContainer = document.createElement("DIV");
        actionContainer.className = "tile-action-container";

        var canvasPreviewDuplicateAction = document.createElement("button");
        canvasPreviewDuplicateAction.setAttribute('rel', 'tooltip');
        canvasPreviewDuplicateAction.setAttribute('data-placement', 'right');
        canvasPreviewDuplicateAction.setAttribute('title', 'Duplicate this frame');
        canvasPreviewDuplicateAction.className = "tile-action duplicate-frame-action";
        actionContainer.appendChild(canvasPreviewDuplicateAction);
        
        canvasPreviewDuplicateAction.addEventListener('click', this.onAddButtonClick_.bind(this, tileNumber));

        // TODO(vincz): Eventually optimize this part by not recreating a FrameRenderer. Note that the real optim
        // is to make this update function (#createPreviewTile) less aggressive.
        var renderingOptions = {"dpi": this.dpi };
        var currentFrameRenderer = new pskl.rendering.FrameRenderer($(canvasContainer), renderingOptions, "tile-view");
        currentFrameRenderer.init(currentFrame);
        
        previewTileRoot.appendChild(canvasContainer);

        if(tileNumber > 0 || this.framesheet.getFrameCount() > 1) {
            var canvasPreviewDeleteAction = document.createElement("button");
            canvasPreviewDeleteAction.setAttribute('rel', 'tooltip');
            canvasPreviewDeleteAction.setAttribute('data-placement', 'right');
            canvasPreviewDeleteAction.setAttribute('title', 'Delete this frame');
            canvasPreviewDeleteAction.className = "tile-action delete-frame-action";
            canvasPreviewDeleteAction.addEventListener('click', this.onDeleteButtonClick_.bind(this, tileNumber));
            previewTileRoot.appendChild(canvasPreviewDeleteAction);
            actionContainer.appendChild(canvasPreviewDeleteAction);
        }

        previewTileRoot.appendChild(actionContainer);

        return previewTileRoot;
    };

    ns.PreviewFilmController.prototype.onPreviewClick_ = function (index, evt) {
        // has not class tile-action:
        if(!evt.target.classList.contains('tile-action')) {
            this.framesheet.setCurrentFrameIndex(index);
        }    
    };

    ns.PreviewFilmController.prototype.onDeleteButtonClick_ = function (index, evt) {
        this.framesheet.removeFrameByIndex(index);
        $.publish(Events.LOCALSTORAGE_REQUEST); // Should come from model   
    };

    ns.PreviewFilmController.prototype.onAddButtonClick_ = function (index, evt) {
        this.framesheet.duplicateFrameByIndex(index);
        $.publish(Events.LOCALSTORAGE_REQUEST);  // Should come from model
        this.framesheet.setCurrentFrameIndex(index + 1);
    };

    /**
     * Calculate the preview DPI depending on the framesheet size
     */
    ns.PreviewFilmController.prototype.calculateDPI_ = function () {
        var previewSize = 128,
            framePixelHeight = this.framesheet.getCurrentFrame().getHeight(),
            framePixelWidth = this.framesheet.getCurrentFrame().getWidth();
        // TODO (julz) : should have a utility to get a Size from framesheet easily (what about empty framesheets though ?)

        return pskl.PixelUtils.calculateDPI(previewSize, previewSize, framePixelHeight, framePixelWidth);
    };
})();