//
//  walkToolsBVHPlayer.js
//  version 0.1
//
//  Created by David Wooldridge, Summer 2015
//  Copyright © 2015 - 2016 David Wooldridge.
//
//  Loads a bvh file and plays it. Important: bvh file MUST represent the animation minus the avatar pre-rotations
//
//  Distributed under the Apache License, Version 2.0.
//  See the accompanying file LICENSE or http://www.apache.org/licenses/LICENSE-2.0.html
//

// Include BVH parser library
Script.include("./libraries/jaanga-bvh-parser-hifi-version.js");

// ECMAScript 6 specification ready string.contains() function
if (!('contains' in String.prototype)) {
    String.prototype.contains = function(str, startIndex) {
        return ''.indexOf.call(this, str, startIndex) !== -1;
    };
}

// bvh player object
WalkToolsBVHPlayer = function() {
    var that = {};

    var _visible = false;
    var _isLive = false;
    var _bvhFrameNumber = 0;
    var _bvhStartTime = 0;
    var _frameTimeModifier = 1;
    var _lastURL = "";

    // web window
	var _innerWidth = Window.innerWidth;
	var _innerHeight = Window.innerHeight;
	const PLAYER_WIDTH = 665;
	const PLAYER_HEIGHT = 190;
	const MARGIN_TOP = 107;
    var _url = Script.resolvePath('../html/walkToolsBVHPlayer.html');
    var _webView = new WebWindow('walkTools BVH Player', _url, PLAYER_WIDTH, PLAYER_HEIGHT, false);
	_webView.setPosition((_innerWidth / 4) - (PLAYER_WIDTH / 2), MARGIN_TOP);
    _webView.setVisible(_visible);

    // translation scale is ratio of hips to feet (metres, in Interface) and hips to feet (units, source animation)
    var _translationScale = 1.0 / 107.08; // i.e. hips to feet in Interface / Hips translation in MB
    var _rawBVHData = null;

    function loadBVHFile(fileURL) {

        print('Downloading bvh file: '+fileURL);
        var _XMLHttpRequest = new XMLHttpRequest();
        _XMLHttpRequest.open("GET", fileURL, false);
        _XMLHttpRequest.send();

        if (_XMLHttpRequest.status == 200) {
			var responseText = _XMLHttpRequest.responseText;

            _rawBVHData = responseText;
            Bvh.parseData(responseText, _translationScale);
            print('bvh file parsed using Jaanga\'s parser.');

			_isLive = true;
			_bvhStartTime = new Date().getTime();

			_webView.eventBridge.emitScriptEvent(JSON.stringify({
				type: "bvhPlayerEvent",
				action: "bvhFileLoaded"
			}));

			// turn off walk.js animation and walkTools
			if (_isLive) {
				motion.isLive = false;
				walkTools.enableWalkTools(false);
			}
        } else {
            print("Error loading bvh file. Status: " + _XMLHttpRequest.status +
                  " Status Text: " + _XMLHttpRequest.statusText +
                  " Error Code: " + _XMLHttpRequest.errorCode);
        }
    }

    // events from webWindow arrive here
    _webView.eventBridge.webEventReceived.connect(function(data) {
        data = JSON.parse(data);

        if (data.type === "bvhPlayerEvent") {
            switch (data.action) {
                case "openBVHFile":
                    if (data.url === _lastURL) {
                        motion.isLive = false;
                        if (walkTools) {
                            walkTools.enableWalkTools(false);
                        }
                        _isLive = true;
                        _webView.eventBridge.emitScriptEvent(JSON.stringify({
                            type: "bvhPlayerEvent",
                            action: "bvhFileLoaded"
                        }));
                    } else {
                        loadBVHFile(data.url);
                        _lastURL = data.url;
                    }
                    return;

                case "playBVHFaster":
                    _frameTimeModifier += 0.1;
                    if (_frameTimeModifier > 10) {
                        _frameTimeModifier = 10;
                    }
                    return;

                case "playBVHSlower":
                    _frameTimeModifier -= 0.1;
                    if (_frameTimeModifier < 0.1) {
                        _frameTimeModifier = 0.1;
                    }
                    return;

                case "stop":
                    _isLive = false;
                    motion.isLive = true;
                    if (walkTools) {
                        walkTools.enableWalkTools(true);
                    }
                    return;
					
				case "export":
                    /*Window.alert('Unable to export BVH file. The exporter is not installed.'); */             
					if (_rawBVHData) {
                        Script.include("./walkTools/walkToolsBVHConverter.js");
						walkToolsBVHConverter.exportJaanga(_rawBVHData, _translationScale);
					} else {
						alert('Unable to export BVH file. Please load a BVH file using the Jaanga parser to continue.');
					}
					return;		
            }
        }
    });

    const MILLISECONDS = 1000;
    Script.update.connect( function( deltaTime ) {

        // preview raw bvh data
        if ( _isLive ) {
            _bvhFrameNumber = ( _frameTimeModifier * ( Date.now() - Bvh.startTime ) / Bvh.secsPerFrame / MILLISECONDS ) | 0;			
            Bvh.animate(_bvhFrameNumber);
        }
    });

    that.setVisible = function( visible ) {
        _visible = visible;
        _webView.setVisible( _visible );
        if ( _visible ) {
            Window.setFocus();
        }
    };

    return that;
};

walkToolsBVHPlayer = WalkToolsBVHPlayer();