/*
 * Copyright (c) 2012 Francisco Salavert (ICM-CIPF)
 * Copyright (c) 2012 Ruben Sanchez (ICM-CIPF)
 * Copyright (c) 2012 Ignacio Medina (ICM-CIPF)
 *
 * This file is part of JS Common Libs.
 *
 * JS Common Libs is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 2 of the License, or
 * (at your option) any later version.
 *
 * JS Common Libs is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with JS Common Libs. If not, see <http://www.gnu.org/licenses/>.
 */

FeatureTrack.prototype = new Track({});

function FeatureTrack(args) {
    Track.call(this, args);

    // Using Underscore 'extend' function to extend and add Backbone Events
    _.extend(this, Backbone.Events);

    //set default args

    //save default render reference;
    this.defaultRenderer = this.renderer;
//    this.histogramRenderer = new FeatureClusterRenderer();
    this.histogramRenderer = new HistogramRenderer(args);

    this.featureType = 'Feature';
    //set instantiation args, must be last
    _.extend(this, args);


    this.resource = this.dataAdapter.resource;
    this.species = this.dataAdapter.species;

    this.dataType = 'features';
};

FeatureTrack.prototype.render = function (targetId) {
    var _this = this;
    this.initializeDom(targetId);

    this.svgCanvasOffset = (this.width * 3 / 2) / this.pixelBase;
    this.svgCanvasLeftLimit = this.region.start - this.svgCanvasOffset * 2;
    this.svgCanvasRightLimit = this.region.start + this.svgCanvasOffset * 2

    this.dataAdapter.on('data:ready', function (event) {
        var features;
        if (event.dataType == 'histogram') {
            _this.renderer = _this.histogramRenderer;
            features = event.items;
        } else {
            _this.renderer = _this.defaultRenderer;
            features = _this.getFeaturesToRenderByChunk(event);
        }
        _this.renderer.render(features, {
            svgCanvasFeatures: _this.svgCanvasFeatures,
            featureTypes: _this.featureTypes,
            renderedArea: _this.renderedArea,
            pixelBase: _this.pixelBase,
            position: _this.region.center(),
            regionSize: _this.region.length(),
            maxLabelRegionSize: _this.maxLabelRegionSize,
            width: _this.width,
            pixelPosition: _this.pixelPosition,
            resource: _this.resource,
            species: _this.species,
            featureType: _this.featureType
        });
        _this.updateHeight();
    });
};

FeatureTrack.prototype.draw = function () {
    var _this = this;

    this.svgCanvasOffset = (this.width * 3 / 2) / this.pixelBase;
    this.svgCanvasLeftLimit = this.region.start - this.svgCanvasOffset * 2;
    this.svgCanvasRightLimit = this.region.start + this.svgCanvasOffset * 2;

    this.updateHistogramParams();
    this.cleanSvg();

    this.dataType = 'features';
    if (this.histogram) {
        this.dataType = 'histogram';
    }


    if (typeof this.visibleRegionSize === 'undefined' || this.region.length() < this.visibleRegionSize) {
        this.setLoading(true);
        this.dataAdapter.getData({
            dataType: this.dataType,
            region: new Region({
                chromosome: this.region.chromosome,
                start: this.region.start - this.svgCanvasOffset * 2,
                end: this.region.end + this.svgCanvasOffset * 2
            }),
            params: {
                histogram: this.histogram,
                histogramLogarithm: this.histogramLogarithm,
                histogramMax: this.histogramMax,
                interval: this.interval
            },
            done: function () {
                _this.setLoading(false);
            }
        });

        this.invalidZoomText.setAttribute("visibility", "hidden");
    } else {
        this.invalidZoomText.setAttribute("visibility", "visible");
    }
    _this.updateHeight();
};


FeatureTrack.prototype.move = function (disp) {
    var _this = this;

    this.dataType = 'features';
    if (this.histogram) {
        this.dataType = 'histogram';
    }

    _this.region.center();
    var pixelDisplacement = disp * _this.pixelBase;
    this.pixelPosition -= pixelDisplacement;

    //parseFloat important
    var move = parseFloat(this.svgCanvasFeatures.getAttribute("x")) + pixelDisplacement;
    this.svgCanvasFeatures.setAttribute("x", move);

    var virtualStart = parseInt(this.region.start - this.svgCanvasOffset);
    var virtualEnd = parseInt(this.region.end + this.svgCanvasOffset);

    if (typeof this.visibleRegionSize === 'undefined' || this.region.length() < this.visibleRegionSize) {

        if (disp > 0 && virtualStart < this.svgCanvasLeftLimit) {
            this.dataAdapter.getData({
                dataType: this.dataType,
                region: new Region({
                    chromosome: _this.region.chromosome,
                    start: parseInt(this.svgCanvasLeftLimit - this.svgCanvasOffset),
                    end: this.svgCanvasLeftLimit
                }),
                params: {
                    histogram: this.histogram,
                    histogramLogarithm: this.histogramLogarithm,
                    histogramMax: this.histogramMax,
                    interval: this.interval
                },
                done: function () {

                }
            });
            this.svgCanvasLeftLimit = parseInt(this.svgCanvasLeftLimit - this.svgCanvasOffset);
        }

        if (disp < 0 && virtualEnd > this.svgCanvasRightLimit) {
            this.dataAdapter.getData({
                dataType: this.dataType,
                region: new Region({
                    chromosome: _this.region.chromosome,
                    start: this.svgCanvasRightLimit,
                    end: parseInt(this.svgCanvasRightLimit + this.svgCanvasOffset)
                }),
                params: {
                    histogram: this.histogram,
                    histogramLogarithm: this.histogramLogarithm,
                    histogramMax: this.histogramMax,
                    interval: this.interval
                },
                done: function () {

                }

            });
            this.svgCanvasRightLimit = parseInt(this.svgCanvasRightLimit + this.svgCanvasOffset);
        }

    }

};
