/**
 *
 * SoundManager 2 Demo: 360-degree / "donut player"
 * ------------------------------------------------
 * http://schillmania.com/projects/soundmanager2/
 *
 * An inline player with a circular UI.
 * Based on the original SM2 inline player.
 * Inspired by Apple's preview feature in the
 * iTunes music store (iPhone), among others.
 *
 * Requires SoundManager 2 Javascript API.
 * Also uses Bernie's Better Animation Class (BSD):
 * http://www.berniecode.com/writing/animator.html
 *
*/

/*global document, window, soundManager, navigator */

var threeSixtyPlayer; // instance

(function(window) {

function ThreeSixtyPlayer() {

  var self = this,
      pl = this,
      sm = soundManager, // soundManager instance
      uA = navigator.userAgent,
      isIE = (uA.match(/msie/i)),
      isOpera = (uA.match(/opera/i)),
      isSafari = (uA.match(/safari/i)),
      isChrome = (uA.match(/chrome/i)),
      isTouchDevice = (uA.match(/ipad|iphone/i)),
      hasRealCanvas = (typeof window.G_vmlCanvasManager === 'undefined' && typeof document.createElement('canvas').getContext('2d') !== 'undefined'),
      // I dunno what Opera doesn't like about this. I'm probably doing it wrong.
      fullCircle = (isOpera || isChrome ? 359.9 : 360),
      // exclude old IE from hi-DPI / "retina"-scale display size
      hiDPIScale = (navigator.userAgent.match(/msie [678]/i) ? 1 : 2);

  // CSS class for ignoring MP3 links
  this.excludeClass = 'threesixty-exclude';
  this.links = [];
  this.sounds = [];
  this.soundsByURL = [];
  this.indexByURL = [];
  this.lastSound = null;
  this.lastTouchedSound = null;
  this.soundCount = 0;
  this.oUITemplate = null;
  this.oUIImageMap = null;
  this.vuMeter = null;
  this.callbackCount = 0;
  this.peakDataHistory = [];

  // 360player configuration options
  this.config = {

    playNext: false,   // stop after one sound, or play through list until end
    autoPlay: false,   // start playing the first sound right away
    allowMultiple: false,  // let many sounds play at once (false = only one sound playing at a time)
    loadRingColor: '#ccc', // how much has loaded
    playRingColor: '#000', // how much has played
    backgroundRingColor: '#eee', // color shown underneath load + play ("not yet loaded" color)

    // optional segment/annotation (metadata) stuff..
    segmentRingColor: 'rgba(255,255,255,0.33)', // metadata/annotation (segment) colors
    segmentRingColorAlt: 'rgba(0,0,0,0.1)',
    loadRingColorMetadata: '#ddd', // "annotations" load color
    playRingColorMetadata: 'rgba(128,192,256,0.9)', // how much has played when metadata is present

    circleDiameter: null, // set dynamically according to values from CSS
    circleRadius: null,
    animDuration: 500,
    animTransition: window.Animator.tx.bouncy, // http://www.berniecode.com/writing/animator.html
    showHMSTime: false, // hours:minutes:seconds vs. seconds-only
    scaleFont: true,  // also set the font size (if possible) while animating the circle

    // optional: spectrum or EQ graph in canvas (not supported in IE <9, too slow via ExCanvas)
    useWaveformData: false,
    waveformDataColor: '#0099ff',
    waveformDataDownsample: 3, // use only one in X (of a set of 256 values) - 1 means all 256
    waveformDataOutside: false,
    waveformDataConstrain: false, // if true, +ve values only - keep within inside circle
    waveformDataLineRatio: 0.64,

    // "spectrum frequency" option
    useEQData: false,
    eqDataColor: '#339933',
    eqDataDownsample: 4, // use only one in X (of 256 values)
    eqDataOutside: true,
    eqDataLineRatio: 0.54,

    // enable "amplifier" (canvas pulses like a speaker) effect
    usePeakData: true,
    peakDataColor: '#ff33ff',
    peakDataOutside: true,
    peakDataLineRatio: 0.5,

    useAmplifier: true, // "pulse" like a speaker

    fontSizeMax: null, // set according to CSS

    scaleArcWidth: 1,  // thickness factor of playback progress ring

    useFavIcon: false // Experimental (also requires usePeakData: true).. Try to draw a "VU Meter" in the favicon area, if browser supports it (Firefox + Opera as of 2009)

  };

  this.css = {

    // CSS class names appended to link during various states
    sDefault: 'sm2_link', // default state
    sBuffering: 'sm2_buffering',
    sPlaying: 'sm2_playing',
    sPaused: 'sm2_paused'

  };

  this.addEventHandler = (typeof window.addEventListener !== 'undefined' ? function(o, evtName, evtHandler) {
    return o.addEventListener(evtName, evtHandler, false);
  } : function(o, evtName, evtHandler) {
    o.attachEvent('on' + evtName, evtHandler);
  });

  this.removeEventHandler = (typeof window.removeEventListener !== 'undefined' ? function(o, evtName, evtHandler) {
    return o.removeEventListener(evtName, evtHandler, false);
  } : function(o, evtName, evtHandler) {
    return o.detachEvent('on' + evtName, evtHandler);
  });

  this.hasClass = function(o, cStr) {
    return typeof (o.className) !== 'undefined' ? o.className.match(new RegExp('(\\s|^)' + cStr + '(\\s|$)')) : false;
  };

  this.addClass = function(o, cStr) {

    if (!o || !cStr || self.hasClass(o, cStr)) {
      return;
    }
    o.className = (o.className ? o.className + ' ' : '') + cStr;

  };

  this.removeClass = function(o, cStr) {

    if (!o || !cStr || !self.hasClass(o, cStr)) {
      return;
    }
    o.className = o.className.replace(new RegExp('( ' + cStr + ')|(' + cStr + ')', 'g'), '');

  };

  this.getElementsByClassName = function(className, tagNames, oParent) {

    var doc = (oParent || document),
        matches = [], i, j, nodes = [];
    if (typeof tagNames !== 'undefined' && typeof tagNames !== 'string') {
      for (i = tagNames.length; i--;) {
        if (!nodes || !nodes[tagNames[i]]) {
          nodes[tagNames[i]] = doc.getElementsByTagName(tagNames[i]);
        }
      }
    } else if (tagNames) {
      nodes = doc.getElementsByTagName(tagNames);
    } else {
      nodes = doc.all || doc.getElementsByTagName('*');
    }
    if (typeof (tagNames) !== 'string') {
      for (i = tagNames.length; i--;) {
        for (j = nodes[tagNames[i]].length; j--;) {
          if (self.hasClass(nodes[tagNames[i]][j], className)) {
            matches.push(nodes[tagNames[i]][j]);
          }
        }
      }
    } else {
      for (i = 0; i < nodes.length; i++) {
        if (self.hasClass(nodes[i], className)) {
          matches.push(nodes[i]);
        }
      }
    }
    return matches;

  };

  this.getParentByNodeName = function(oChild, sParentNodeName) {

    if (!oChild || !sParentNodeName) {
      return false;
    }
    sParentNodeName = sParentNodeName.toLowerCase();
    while (oChild.parentNode && sParentNodeName !== oChild.parentNode.nodeName.toLowerCase()) {
      oChild = oChild.parentNode;
    }
    return (oChild.parentNode && sParentNodeName === oChild.parentNode.nodeName.toLowerCase() ? oChild.parentNode : null);

  };

  this.getParentByClassName = function(oChild, sParentClassName) {

    if (!oChild || !sParentClassName) {
      return null;
    }
    while (oChild.parentNode && !self.hasClass(oChild.parentNode, sParentClassName)) {
      oChild = oChild.parentNode;
    }
    return (oChild.parentNode && self.hasClass(oChild.parentNode, sParentClassName) ? oChild.parentNode : null);

  };

  this.getSoundByURL = function(sURL) {
    return (typeof self.soundsByURL[sURL] !== 'undefined' ? self.soundsByURL[sURL] : null);
  };

  this.isChildOfNode = function(o, sNodeName) {

    if (!o || !o.parentNode) {
      return false;
    }
    sNodeName = sNodeName.toLowerCase();
    do {
      o = o.parentNode;
    } while (o && o.parentNode && o.nodeName.toLowerCase() !== sNodeName);
    return (o && o.nodeName.toLowerCase() === sNodeName ? o : null);

  };

  this.isChildOfClass = function(oChild, oClass) {

    if (!oChild || !oClass) {
      return false;
    }
    while (oChild.parentNode && !self.hasClass(oChild, oClass)) {
      oChild = self.findParent(oChild);
    }
    return (self.hasClass(oChild, oClass));

  };

  this.findParent = function(o) {

    if (!o || !o.parentNode) {
      return false;
    }
    o = o.parentNode;
    if (o.nodeType === 2) {
      while (o && o.parentNode && o.parentNode.nodeType === 2) {
        o = o.parentNode;
      }
    }
    return o;

  };

  this.getStyle = function(o, sProp) {

    // http://www.quirksmode.org/dom/getstyles.html
    try {
      if (o.currentStyle) {
        return o.currentStyle[sProp];
      } else if (window.getComputedStyle) {
        return document.defaultView.getComputedStyle(o, null).getPropertyValue(sProp);
      }
    } catch(e) {
      // oh well
    }
    return null;

  };

  this.findXY = function(obj) {

    var curleft = 0, curtop = 0;
    do {
      curleft += obj.offsetLeft;
      curtop += obj.offsetTop;
    } while (obj = obj.offsetParent);
    return [curleft, curtop];

  };

  this.getMouseXY = function(e) {

    // http://www.quirksmode.org/js/events_properties.html
    e = e || window.event;
    if (isTouchDevice && e.touches) {
      e = e.touches[0];
    }
    if (e.pageX || e.pageY) {
      return [e.pageX, e.pageY];
    } else if (e.clientX || e.clientY) {
      return [e.clientX + self.getScrollLeft(), e.clientY + self.getScrollTop()];
    }
    return [undefined, undefined];

  };

  this.getScrollLeft = function() {
    return (document.body.scrollLeft + document.documentElement.scrollLeft);
  };

  this.getScrollTop = function() {
    return (document.body.scrollTop + document.documentElement.scrollTop);
  };

  this.events = {

    // handlers for sound events as they're started/stopped/played

    play: function() {
      pl.removeClass(this._360data.oUIBox, this._360data.className);
      this._360data.className = pl.css.sPlaying;
      pl.addClass(this._360data.oUIBox, this._360data.className);
      self.fanOut(this);
    },

    stop: function() {
      pl.removeClass(this._360data.oUIBox, this._360data.className);
      this._360data.className = '';
      self.fanIn(this);
    },

    pause: function() {
      pl.removeClass(this._360data.oUIBox, this._360data.className);
      this._360data.className = pl.css.sPaused;
      pl.addClass(this._360data.oUIBox, this._360data.className);
    },

    resume: function() {
      pl.removeClass(this._360data.oUIBox, this._360data.className);
      this._360data.className = pl.css.sPlaying;
      pl.addClass(this._360data.oUIBox, this._360data.className);
    },

    finish: function() {
      var nextLink;
      pl.removeClass(this._360data.oUIBox, this._360data.className);
      this._360data.className = '';
      // self.clearCanvas(this._360data.oCanvas);
      this._360data.didFinish = true; // so fan draws full circle
      self.fanIn(this);
      if (pl.config.playNext) {
        nextLink = (pl.indexByURL[this._360data.oLink.href] + 1);
        if (nextLink < pl.links.length) {
          pl.handleClick({ target: pl.links[nextLink] });
        }
      }
    },

    whileloading: function() {
      if (this.paused) {
        self.updatePlaying.apply(this);
      }
    },

    whileplaying: function() {
      self.updatePlaying.apply(this);
      this._360data.fps++;
    },

    bufferchange: function() {
      if (this.isBuffering) {
        pl.addClass(this._360data.oUIBox, pl.css.sBuffering);
      } else {
        pl.removeClass(this._360data.oUIBox, pl.css.sBuffering);
      }
    }

  };

  this.stopEvent = function(e) {

   if (typeof e !== 'undefined' && typeof e.preventDefault !== 'undefined') {
      e.preventDefault();
    } else if (typeof window.event !== 'undefined' && typeof window.event.returnValue !== 'undefined') {
      window.event.returnValue = false;
    }
    return false;

  };

  this.getTheDamnLink = (isIE) ? function(e) {
    // I really didn't want to have to do this.
    return (e && e.target ? e.target : window.event.srcElement);
  } : function(e) {
    return e.target;
  };

  this.handleClick = function(e) {

    // a sound link was clicked
    if (e.button > 1) {
      // only catch left-clicks
      return true;
    }

    var o = self.getTheDamnLink(e),
        canvasElements, soundURL, thisSound, oContainer, has_vis, diameter;

    if (o.nodeName.toLowerCase() !== 'a') {
      o = self.isChildOfNode(o, 'a');
      if (!o) {
        return true;
      }
    }

    if (!self.isChildOfClass(o, 'ui360')) {
      // not a link we're interested in
      return true;
    }

    if (!o.href || !sm.canPlayLink(o) || self.hasClass(o, self.excludeClass)) {
      return true; // pass-thru for non-MP3/non-links
    }

    sm._writeDebug('handleClick()');
    soundURL = (o.href);
    thisSound = self.getSoundByURL(soundURL);

    if (thisSound) {

      // already exists
      if (thisSound === self.lastSound) {
        // and was playing (or paused)
        thisSound.togglePause();
      } else {
        // different sound
        thisSound.togglePause(); // start playing current
        sm._writeDebug('sound different than last sound: ' + self.lastSound.id);
        if (!self.config.allowMultiple && self.lastSound) {
          self.stopSound(self.lastSound);
        }
      }

    } else {

      // append some dom shiz, make noise

      oContainer = o.parentNode;
      has_vis = (self.getElementsByClassName('ui360-vis', 'div', oContainer.parentNode).length);

      // create sound
      thisSound = sm.createSound({
       id: 'ui360Sound' + (self.soundCount++),
       url: soundURL,
       onplay: self.events.play,
       onstop: self.events.stop,
       onpause: self.events.pause,
       onresume: self.events.resume,
       onfinish: self.events.finish,
       onbufferchange: self.events.bufferchange,
       type: (o.type || null),
       whileloading: self.events.whileloading,
       whileplaying: self.events.whileplaying,
       useWaveformData: (has_vis && self.config.useWaveformData),
       useEQData: (has_vis && self.config.useEQData),
       usePeakData: (has_vis && self.config.usePeakData)
      });

      // tack on some custom data

      diameter = parseInt(self.getElementsByClassName('sm2-360ui', 'div', oContainer)[0].offsetWidth * hiDPIScale, 10);

      // see note re: IE <9 and excanvas when Modernizr is included, making weird things happen with <canvas>.
      canvasElements = self.getElementsByClassName('sm2-canvas', 'canvas', oContainer);

      thisSound._360data = {
        oUI360: self.getParentByClassName(o, 'ui360'), // the (whole) entire container
        oLink: o, // DOM node for reference within SM2 object event handlers
        className: self.css.sPlaying,
        oUIBox: self.getElementsByClassName('sm2-360ui', 'div', oContainer)[0],
        oCanvas: canvasElements[canvasElements.length - 1],
        oButton: self.getElementsByClassName('sm2-360btn', 'span', oContainer)[0],
        oTiming: self.getElementsByClassName('sm2-timing', 'div', oContainer)[0],
        oCover: self.getElementsByClassName('sm2-cover', 'div', oContainer)[0],
        circleDiameter: diameter,
        circleRadius: diameter / 2,
        lastTime: null,
        didFinish: null,
        pauseCount: 0,
        radius: 0,
        fontSize: 1,
        fontSizeMax: self.config.fontSizeMax,
        scaleFont: (has_vis && self.config.scaleFont),
        showHMSTime: has_vis,
        amplifier: (has_vis && self.config.usePeakData ? 0.9 : 1), // TODO: x1 if not being used, else use dynamic "how much to amplify by" value
        radiusMax: diameter * 0.175, // circle radius
        width: 0,
        widthMax: diameter * 0.4, // width of the outer ring
        lastValues: {
          bytesLoaded: 0,
          bytesTotal: 0,
          position: 0,
          durationEstimate: 0
        }, // used to track "last good known" values before sound finish/reset for anim
        animating: false,
        oAnim: new window.Animator({
          duration: self.config.animDuration,
          transition: self.config.animTransition,
          onComplete: function() {
            // var thisSound = this;
            // thisSound._360data.didFinish = false; // reset full circle
          }
        }),
        oAnimProgress: function(nProgress) {
          var s = this;
          s._360data.radius = parseInt(s._360data.radiusMax * s._360data.amplifier * nProgress, 10);
          s._360data.width = parseInt(s._360data.widthMax * s._360data.amplifier * nProgress, 10);
          if (s._360data.scaleFont && s._360data.fontSizeMax !== null) {
            s._360data.oTiming.style.fontSize = parseInt(Math.max(1, s._360data.fontSizeMax * nProgress), 10) + 'px';
            s._360data.oTiming.style.opacity = nProgress;
          }
          if (s.paused || s.playState === 0 || s._360data.lastValues.bytesLoaded === 0 || s._360data.lastValues.position === 0) {
            self.updatePlaying.apply(s);
          }
        },
        fps: 0
      };

      // "Metadata" (annotations)
      if (typeof self.Metadata !== 'undefined' && self.getElementsByClassName('metadata', 'div', thisSound._360data.oUI360).length) {
        thisSound._360data.metadata = new self.Metadata(thisSound, self);
      }

      // minimize ze font
      if (thisSound._360data.scaleFont && thisSound._360data.fontSizeMax !== null) {
        thisSound._360data.oTiming.style.fontSize = '1px';
      }

      // set up ze animation
      thisSound._360data.oAnim.addSubject(thisSound._360data.oAnimProgress, thisSound);

      // animate the radius out nice
      self.refreshCoords(thisSound);

      self.updatePlaying.apply(thisSound);

      self.soundsByURL[soundURL] = thisSound;
      self.sounds.push(thisSound);
      if (!self.config.allowMultiple && self.lastSound) {
        self.stopSound(self.lastSound);
      }
      thisSound.play();

    }

    self.lastSound = thisSound; // reference for next call

    if (typeof e !== 'undefined' && typeof e.preventDefault !== 'undefined') {
      e.preventDefault();
    } else if (typeof window.event !== 'undefined') {
      window.event.returnValue = false;
    }
    return false;

  };

  this.fanOut = function(oSound) {

     var thisSound = oSound;
     if (thisSound._360data.animating === 1) {
       return;
     }
     thisSound._360data.animating = 0;
     soundManager._writeDebug('fanOut: ' + thisSound.id + ': ' + thisSound._360data.oLink.href);
     thisSound._360data.oAnim.seekTo(1); // play to end
     window.setTimeout(function() {
       // oncomplete hack
       thisSound._360data.animating = 0;
     }, self.config.animDuration + 20);

  };

  this.fanIn = function(oSound) {

     var thisSound = oSound;
     if (thisSound._360data.animating === -1) {
       return;
     }
     thisSound._360data.animating = -1;
     soundManager._writeDebug('fanIn: ' + thisSound.id + ': ' + thisSound._360data.oLink.href);
     // massive hack
     thisSound._360data.oAnim.seekTo(0); // play to end
     window.setTimeout(function() {
       // reset full 360 fill after animation has completed (oncomplete hack)
       thisSound._360data.didFinish = false;
       thisSound._360data.animating = 0;
       self.resetLastValues(thisSound);
     }, self.config.animDuration + 20);

  };

  this.resetLastValues = function(oSound) {
    oSound._360data.lastValues.position = 0;
  };

  this.refreshCoords = function(thisSound) {

    thisSound._360data.canvasXY = self.findXY(thisSound._360data.oCanvas);
    thisSound._360data.canvasMid = [thisSound._360data.circleRadius, thisSound._360data.circleRadius];
    thisSound._360data.canvasMidXY = [thisSound._360data.canvasXY[0] + thisSound._360data.canvasMid[0], thisSound._360data.canvasXY[1] + thisSound._360data.canvasMid[1]];

  };

  this.stopSound = function(oSound) {

    soundManager._writeDebug('stopSound: ' + oSound.id);
    soundManager.stop(oSound.id);
    if (!isTouchDevice) { // iOS 4.2+ security blocks onfinish() -> playNext() if we set a .src in-between(?)
      soundManager.unload(oSound.id);
    }

  };

  this.buttonClick = function(e) {

    var o = e ? (e.target ? e.target : e.srcElement) : window.event.srcElement;
    self.handleClick({ target: self.getParentByClassName(o, 'sm2-360ui').nextSibling }); // link next to the nodes we inserted
    return false;

  };

  this.buttonMouseDown = function(ee) {

    // user might decide to drag from here
    // watch for mouse move
    if (!isTouchDevice) {
      document.onmousemove = function(eee) {
        // should be boundary-checked, really (eg. move 3px first?)
        self.mouseDown(eee);
      };
    } else {
      self.addEventHandler(document, 'touchmove', self.mouseDown);
    }
    self.stopEvent(ee);
    return false;

  };

  this.mouseDown = function(ee) {

    if (!isTouchDevice && ee.button > 1) {
      return true; // ignore non-left-click
    }

    if (!self.lastSound) {
      self.stopEvent(ee);
      return false;
    }

    var evt = ee || window.event,
        target, thisSound, oData;

    if (isTouchDevice && evt.touches) {
      evt = evt.touches[0];
    }
    target = (evt.target || evt.srcElement);

    thisSound = self.getSoundByURL(self.getElementsByClassName('sm2_link', 'a', self.getParentByClassName(target, 'ui360'))[0].href); // self.lastSound; // TODO: In multiple sound case, figure out which sound is involved etc.
    // just in case, update coordinates (maybe the element moved since last time.)
    self.lastTouchedSound = thisSound;
    self.refreshCoords(thisSound);
    oData = thisSound._360data;
    self.addClass(oData.oUIBox, 'sm2_dragging');
    oData.pauseCount = (self.lastTouchedSound.paused ? 1 : 0);
    // self.lastSound.pause();
    self.mmh(ee || window.event);

    if (isTouchDevice) {
      self.removeEventHandler(document, 'touchmove', self.mouseDown);
      self.addEventHandler(document, 'touchmove', self.mmh);
      self.addEventHandler(document, 'touchend', self.mouseUp);
    } else {
      // incredibly old-skool. TODO: Modernize.
      document.onmousemove = self.mmh;
      document.onmouseup = self.mouseUp;
    }

    self.stopEvent(ee);
    return false;

  };

  this.mouseUp = function(/*ee*/) {

    var oData = self.lastTouchedSound._360data;
    self.removeClass(oData.oUIBox, 'sm2_dragging');
    if (oData.pauseCount === 0) {
      self.lastTouchedSound.resume();
    }
    if (!isTouchDevice) {
      document.onmousemove = null;
      document.onmouseup = null;
    } else {
      self.removeEventHandler(document, 'touchmove', self.mmh);
      self.removeEventHandler(document, 'touchend', self.mouseUP);
    }

  };

  this.mmh = function(ee) {

    if (typeof ee === 'undefined') {
      ee = window.event;
    }
    var oSound = self.lastTouchedSound,
        coords = self.getMouseXY(ee),
        x = coords[0],
        y = coords[1],
        deltaX = x - oSound._360data.canvasMidXY[0],
        deltaY = y - oSound._360data.canvasMidXY[1],
        angle = Math.floor(fullCircle - (self.rad2deg(Math.atan2(deltaX, deltaY)) + 180));

    oSound.setPosition(oSound.durationEstimate * (angle / fullCircle));
    self.stopEvent(ee);
    return false;

  };

  // assignMouseDown();

  this.drawSolidArc = function(oCanvas, color, radius, width, radians, startAngle, noClear) {

    // thank you, http://www.snipersystems.co.nz/community/polarclock/tutorial.html

    var canvas = oCanvas,
        ctx, innerRadius, doesntLikeZero, endPoint;

    if (canvas.getContext) {
      // use getContext to use the canvas for drawing
      ctx = canvas.getContext('2d');
    }

    // re-assign canvas as the actual context
    oCanvas = ctx;

    if (!noClear) {
      self.clearCanvas(canvas);
    }
    // ctx.restore();

    if (color) {
      ctx.fillStyle = color;
    }

    oCanvas.beginPath();

    if (isNaN(radians)) {
      radians = 0;
    }

    innerRadius = radius - width;
    doesntLikeZero = (isOpera || isSafari); // safari 4 doesn't actually seem to mind.

    if (!doesntLikeZero || (doesntLikeZero && radius > 0)) {
      oCanvas.arc(0, 0, radius, startAngle, radians, false);
      endPoint = self.getArcEndpointCoords(innerRadius, radians);
      oCanvas.lineTo(endPoint.x, endPoint.y);
      oCanvas.arc(0, 0, innerRadius, radians, startAngle, true);
      oCanvas.closePath();
      oCanvas.fill();
    }

  };

  this.getArcEndpointCoords = function(radius, radians) {

    return {
      x: radius * Math.cos(radians),
      y: radius * Math.sin(radians)
    };

  };

  this.deg2rad = function(nDeg) {
    return (nDeg * (Math.PI / 180));
  };

  this.rad2deg = function(nRad) {
    return (nRad * (180 / Math.PI));
  };

  this.getTime = function(nMSec, bAsString) {

    // convert milliseconds to mm:ss, return as object literal or string
    var nSec = Math.floor(nMSec / 1000),
        min = Math.floor(nSec / 60),
        sec = nSec - (min * 60);
    // if (min === 0 && sec === 0) return null; // return 0:00 as null
    return (bAsString ? (min + ':' + (sec < 10 ? '0' + sec : sec)) : { min: min, sec: sec });

  };

  this.clearCanvas = function(oCanvas) {

    var canvas = oCanvas,
        ctx = null,
        width, height;

    if (canvas.getContext) {
      // use getContext to use the canvas for drawing
      ctx = canvas.getContext('2d');
    }

    if (ctx) {
      width = canvas.offsetWidth;
      height = canvas.offsetHeight;
      ctx.clearRect(-(width / 2), -(height / 2), width, height);
    }

  };

  this.updatePlaying = function() {

    var timeNow = (this._360data.showHMSTime ? self.getTime(this.position, true) : parseInt(this.position / 1000, 10));
    var ringScaleFactor = self.config.scaleArcWidth;

    if (this.bytesLoaded) {
      this._360data.lastValues.bytesLoaded = this.bytesLoaded;
      this._360data.lastValues.bytesTotal = this.bytesTotal;
    }

    if (this.position) {
      this._360data.lastValues.position = this.position;
    }

    if (this.durationEstimate) {
      this._360data.lastValues.durationEstimate = this.durationEstimate;
    }

    // background ring
    self.drawSolidArc(this._360data.oCanvas, self.config.backgroundRingColor, this._360data.width, this._360data.radius * ringScaleFactor, self.deg2rad(fullCircle), false);

    // loaded ring
    self.drawSolidArc(this._360data.oCanvas, (this._360data.metadata ? self.config.loadRingColorMetadata : self.config.loadRingColor), this._360data.width, this._360data.radius * ringScaleFactor, self.deg2rad(fullCircle * (this._360data.lastValues.bytesLoaded / this._360data.lastValues.bytesTotal)), 0, true);

    // don't draw if 0 (full black circle in Opera)
    if (this._360data.lastValues.position !== 0) {
      self.drawSolidArc(this._360data.oCanvas, (this._360data.metadata ? self.config.playRingColorMetadata : self.config.playRingColor), this._360data.width, this._360data.radius * ringScaleFactor, self.deg2rad((this._360data.didFinish === 1 ? fullCircle : fullCircle * (this._360data.lastValues.position / this._360data.lastValues.durationEstimate))), 0, true);
    }

    // metadata goes here
    if (this._360data.metadata) {
      this._360data.metadata.events.whileplaying();
    }

    if (timeNow !== this._360data.lastTime) {
      this._360data.lastTime = timeNow;
      this._360data.oTiming.innerHTML = timeNow;
    }

    // draw spectrum, if applicable
    if ((this.instanceOptions.useWaveformData || this.instanceOptions.useEQData) && hasRealCanvas) { // IE <9 can render maybe 3 or 4 FPS when including the wave/EQ, so don't bother.
      self.updateWaveform(this);
    }

    if (self.config.useFavIcon && self.vuMeter) {
      self.vuMeter.updateVU(this);
    }

  };

  this.updateWaveform = function(oSound) {

    if ((!self.config.useWaveformData && !self.config.useEQData) || (!sm.features.waveformData && !sm.features.eqData)) {
      // feature not enabled..
      return;
    }

    if (!oSound.waveformData.left.length && !oSound.eqData.length && !oSound.peakData.left) {
      // no data (or errored out/paused/unavailable?)
      return;
    }

    /* use for testing the data */
    /*
     for (i=0; i<256; i++) {
       oSound.eqData[i] = 1-(i/256);
     }
    */

    var offY = parseInt(oSound._360data.circleDiameter / 2, 10),
        scale = offY / 2, // Y axis (+/- this distance from 0)
        i, direction, downSample, dataLength, sampleCount, startAngle, endAngle, waveData, innerRadius, perItemAngle, eqSamples, playedAngle, nPeak;

    if (self.config.useWaveformData) {
      // raw waveform
      downSample = self.config.waveformDataDownsample; // only sample X in 256 (greater number = less sample points)
      downSample = Math.max(1, downSample); // make sure it's at least 1
      dataLength = 256;
      sampleCount = (dataLength / downSample);
      startAngle = 0;
      endAngle = 0;
      waveData = null;
      innerRadius = (self.config.waveformDataOutside ? 1 : (self.config.waveformDataConstrain ? 0.5 : 0.565));
      scale = (self.config.waveformDataOutside ? 0.7 : 0.75);
      perItemAngle = self.deg2rad((360 / sampleCount) * self.config.waveformDataLineRatio); // 0.85 = clean pixel lines at 150? // self.deg2rad(360*(Math.max(1,downSample-1))/sampleCount);
      for (i = 0; i < dataLength; i += downSample) {
        startAngle = self.deg2rad(360 * ((i / sampleCount) * (1 / downSample))); // +0.67 - counter for spacing
        endAngle = startAngle + perItemAngle;
        waveData = oSound.waveformData.left[i];
        if (waveData < 0 && self.config.waveformDataConstrain) {
          waveData = Math.abs(waveData);
        }
        self.drawSolidArc(oSound._360data.oCanvas, self.config.waveformDataColor, oSound._360data.width * innerRadius * (2 - self.config.scaleArcWidth), oSound._360data.radius * scale * 1.25 * waveData, endAngle, startAngle, true);
      }
    }

    if (self.config.useEQData) {
      // EQ spectrum
      downSample = self.config.eqDataDownsample; // only sample N in 256
      downSample = Math.max(1, downSample); // make sure it's at least 1
      eqSamples = 192; // drop the last 25% of the spectrum (>16500 Hz), most stuff won't actually use it.
      sampleCount = (eqSamples / downSample);
      innerRadius = (self.config.eqDataOutside ? 1 : 0.565);
      direction = (self.config.eqDataOutside ? -1 : 1);
      scale = (self.config.eqDataOutside ? 0.5 : 0.75);
      startAngle = 0;
      endAngle = 0;
      perItemAngle = self.deg2rad((360 / sampleCount) * self.config.eqDataLineRatio); // self.deg2rad(360/(sampleCount+1));
      playedAngle = self.deg2rad((oSound._360data.didFinish === 1 ? 360 : 360 * (oSound._360data.lastValues.position / oSound._360data.lastValues.durationEstimate)));
      for (i = 0; i < eqSamples; i += downSample) {
        startAngle = self.deg2rad(360 * (i / eqSamples));
        endAngle = startAngle + perItemAngle;
        self.drawSolidArc(oSound._360data.oCanvas, (endAngle > playedAngle ? self.config.eqDataColor : self.config.playRingColor), oSound._360data.width * innerRadius, oSound._360data.radius * scale * (oSound.eqData.left[i] * direction), endAngle, startAngle, true);
      }
    }

    if (self.config.usePeakData) {
      if (!oSound._360data.animating) {
        nPeak = (oSound.peakData.left || oSound.peakData.right);
        // GIANT HACK: use EQ spectrum data for bass frequencies
        eqSamples = 3;
        for (i = 0; i < eqSamples; i++) {
          nPeak = (nPeak || oSound.eqData[i]);
        }
        oSound._360data.amplifier = (self.config.useAmplifier ? (0.9 + (nPeak * 0.1)) : 1);
        oSound._360data.radiusMax = oSound._360data.circleDiameter * 0.175 * oSound._360data.amplifier;
        oSound._360data.widthMax = oSound._360data.circleDiameter * 0.4 * oSound._360data.amplifier;
        oSound._360data.radius = parseInt(oSound._360data.radiusMax * oSound._360data.amplifier, 10);
        oSound._360data.width = parseInt(oSound._360data.widthMax * oSound._360data.amplifier, 10);
      }
    }

  };

  this.getUIHTML = function(diameter) {

    return [
     '<canvas class="sm2-canvas" width="' + diameter + '" height="' + diameter + '"></canvas>',
     ' <span class="sm2-360btn sm2-360btn-default"></span>', // note use of imageMap, edit or remove if you use a different-size image.
     ' <div class="sm2-timing' + (navigator.userAgent.match(/safari/i) ? ' alignTweak' : '') + '"></div>', // + Ever-so-slight Safari horizontal alignment tweak
     ' <div class="sm2-cover"></div>'
    ];

  };

  this.uiTest = function(sClass) {

    // fake a 360 UI so we can get some numbers from CSS, etc.

    var oTemplate = document.createElement('div'),
        oFakeUI, oFakeUIBox, oTemp, fakeDiameter, uiHTML, circleDiameter, circleRadius, fontSizeMax, oTiming;

    oTemplate.className = 'sm2-360ui';

    oFakeUI = document.createElement('div');
    oFakeUI.className = 'ui360' + (sClass ? ' ' + sClass : ''); // ui360 ui360-vis

    oFakeUIBox = oFakeUI.appendChild(oTemplate.cloneNode(true));

    oFakeUI.style.position = 'absolute';
    oFakeUI.style.left = '-9999px';

    oTemp = document.body.appendChild(oFakeUI);

    fakeDiameter = oFakeUIBox.offsetWidth * hiDPIScale;

    uiHTML = self.getUIHTML(fakeDiameter);

    oFakeUIBox.innerHTML = uiHTML[1] + uiHTML[2] + uiHTML[3];

    circleDiameter = parseInt(fakeDiameter, 10);
    circleRadius = parseInt(circleDiameter / 2, 10);

    oTiming = self.getElementsByClassName('sm2-timing', 'div', oTemp)[0];
    fontSizeMax = parseInt(self.getStyle(oTiming, 'font-size'), 10);
    if (isNaN(fontSizeMax)) {
      // getStyle() etc. didn't work.
      fontSizeMax = null;
    }

    // soundManager._writeDebug('diameter, font size: '+circleDiameter+','+fontSizeMax);

    oFakeUI.parentNode.removeChild(oFakeUI);

    uiHTML = oFakeUI = oFakeUIBox = oTemp = null;

    return {
      circleDiameter: circleDiameter,
      circleRadius: circleRadius,
      fontSizeMax: fontSizeMax
    };

  };

  this.init = function() {

    sm._writeDebug('threeSixtyPlayer.init()');

    var oItems = self.getElementsByClassName('ui360', 'div'),
        i, j, oLinks = [], is_vis = false, foundItems = 0, canvasElements, oCanvas, oCanvasCTX, oCover, diameter, radius, uiData, uiDataVis, oUI, oBtn, o2, oID;

    for (i = 0, j = oItems.length; i < j; i++) {
      oLinks.push(oItems[i].getElementsByTagName('a')[0]);
      // remove "fake" play button (unsupported case)
      oItems[i].style.backgroundImage = 'none';
    }
    // grab all links, look for .mp3

    self.oUITemplate = document.createElement('div');
    self.oUITemplate.className = 'sm2-360ui';

    self.oUITemplateVis = document.createElement('div');
    self.oUITemplateVis.className = 'sm2-360ui';

    uiData = self.uiTest();

    self.config.circleDiameter = uiData.circleDiameter;
    self.config.circleRadius = uiData.circleRadius;
    // self.config.fontSizeMax = uiData.fontSizeMax;

    uiDataVis = self.uiTest('ui360-vis');

    self.config.fontSizeMax = uiDataVis.fontSizeMax;

    // canvas needs inline width and height, doesn't quite work otherwise
    self.oUITemplate.innerHTML = self.getUIHTML(self.config.circleDiameter).join('');

    self.oUITemplateVis.innerHTML = self.getUIHTML(uiDataVis.circleDiameter).join('');

    for (i = 0, j = oLinks.length; i < j; i++) {
      if (sm.canPlayLink(oLinks[i]) && !self.hasClass(oLinks[i], self.excludeClass) && !self.hasClass(oLinks[i], self.css.sDefault)) {
        self.addClass(oLinks[i], self.css.sDefault); // add default CSS decoration
        self.links[foundItems] = (oLinks[i]);
        self.indexByURL[oLinks[i].href] = foundItems; // hack for indexing
        foundItems++;

        is_vis = self.hasClass(oLinks[i].parentNode, 'ui360-vis');

        diameter = (is_vis ? uiDataVis : uiData).circleDiameter;
        radius = (is_vis ? uiDataVis : uiData).circleRadius;

        // add canvas shiz
        oUI = oLinks[i].parentNode.insertBefore((is_vis ? self.oUITemplateVis : self.oUITemplate).cloneNode(true), oLinks[i]);

        if (isIE && typeof window.G_vmlCanvasManager !== 'undefined') { // IE only
          o2 = document.createElement('canvas');
          o2.className = 'sm2-canvas';
          oID = 'sm2_canvas_' + i + (new Date().getTime());
          o2.id = oID;
          o2.width = diameter;
          o2.height = diameter;
          oUI.appendChild(o2);
          window.G_vmlCanvasManager.initElement(o2); // Apply ExCanvas compatibility magic
          oCanvas = document.getElementById(oID);
          /**
           * 05/2013: If present, Modernizr results in two canvas elements or something being made, one being <:canvas>.
           * When this is the case, the first doesn't have getContext('2d') and such - so, use the second.
           */
           canvasElements = oCanvas.parentNode.getElementsByTagName('canvas');
           if (canvasElements.length > 1) {
             oCanvas = canvasElements[canvasElements.length - 1];
           }
        } else {
          // add a handler for the button
          oCanvas = oLinks[i].parentNode.getElementsByTagName('canvas')[0];
        }
        // enable hi-DPI / retina features?
        if (hiDPIScale > 1) {
          self.addClass(oCanvas, 'hi-dpi');
        }
        oCover = self.getElementsByClassName('sm2-cover', 'div', oLinks[i].parentNode)[0];
        oBtn = oLinks[i].parentNode.getElementsByTagName('span')[0];
        self.addEventHandler(oBtn, 'click', self.buttonClick);
        if (!isTouchDevice) {
          self.addEventHandler(oCover, 'mousedown', self.mouseDown);
        } else {
          self.addEventHandler(oCover, 'touchstart', self.mouseDown);
        }
        oCanvasCTX = oCanvas.getContext('2d');
        oCanvasCTX.translate(radius, radius);
        oCanvasCTX.rotate(self.deg2rad(-90)); // compensate for arc starting at EAST // http://stackoverflow.com/questions/319267/tutorial-for-html-canvass-arc-function
      }
    }
    if (foundItems > 0) {
      self.addEventHandler(document, 'click', self.handleClick);
      if (self.config.autoPlay) {
        self.handleClick({ target: self.links[0], preventDefault: function() {} });
      }
    }
    sm._writeDebug('threeSixtyPlayer.init(): Found ' + foundItems + ' relevant items.');

    if (self.config.useFavIcon && typeof this.VUMeter !== 'undefined') {
      this.vuMeter = new this.VUMeter(this);
    }

  };

}

// Optional: VU Meter component

ThreeSixtyPlayer.prototype.VUMeter = function(oParent) {

  var self = oParent,
      me = this,
      _head = document.getElementsByTagName('head')[0],
      isOpera = (navigator.userAgent.match(/opera/i)),
      isFirefox = (navigator.userAgent.match(/firefox/i));

  this.vuMeterData = [];
  this.vuDataCanvas = null;

  this.setPageIcon = function(sDataURL) {

    if (!self.config.useFavIcon || !self.config.usePeakData || !sDataURL) {
      return;
    }

    var link = document.getElementById('sm2-favicon');
    if (link) {
      _head.removeChild(link);
      link = null;
    }
    if (!link) {
      link = document.createElement('link');
      link.id = 'sm2-favicon';
      link.rel = 'shortcut icon';
      link.type = 'image/png';
      link.href = sDataURL;
      document.getElementsByTagName('head')[0].appendChild(link);
    }

  };

  this.resetPageIcon = function() {

    if (!self.config.useFavIcon) {
      return;
    }
    var link = document.getElementById('favicon');
    if (link) {
      link.href = '/favicon.ico';
    }

  };

  this.updateVU = function(oSound) {

    if (soundManager.flashVersion >= 9 && self.config.useFavIcon && self.config.usePeakData) {
      me.setPageIcon(me.vuMeterData[parseInt(16 * oSound.peakData.left, 10)][parseInt(16 * oSound.peakData.right, 10)]);
    }

  };

  this.createVUData = function() {

    var i = 0, j = 0,
        canvas = me.vuDataCanvas.getContext('2d'),
        vuGrad = canvas.createLinearGradient(0, 16, 0, 0),
        bgGrad = canvas.createLinearGradient(0, 16, 0, 0),
        outline = 'rgba(0,0,0,0.2)';

    vuGrad.addColorStop(0, 'rgb(0,192,0)');
    vuGrad.addColorStop(0.30, 'rgb(0,255,0)');
    vuGrad.addColorStop(0.625, 'rgb(255,255,0)');
    vuGrad.addColorStop(0.85, 'rgb(255,0,0)');
    bgGrad.addColorStop(0, outline);
    bgGrad.addColorStop(1, 'rgba(0,0,0,0.5)');
    for (i = 0; i < 16; i++) {
      me.vuMeterData[i] = [];
    }
    for (i = 0; i < 16; i++) {
      for (j = 0; j < 16; j++) {
        // reset/erase canvas
        me.vuDataCanvas.setAttribute('width', 16);
        me.vuDataCanvas.setAttribute('height', 16);
        // draw new stuffs
        canvas.fillStyle = bgGrad;
        canvas.fillRect(0, 0, 7, 15);
        canvas.fillRect(8, 0, 7, 15);
        /*
        // shadow
        canvas.fillStyle = 'rgba(0,0,0,0.1)';
        canvas.fillRect(1,15-i,7,17-(17-i));
        canvas.fillRect(9,15-j,7,17-(17-j));
        */
        canvas.fillStyle = vuGrad;
        canvas.fillRect(0, 15 - i, 7, 16 - (16 - i));
        canvas.fillRect(8, 15 - j, 7, 16 - (16 - j));
        // and now, clear out some bits.
        canvas.clearRect(0, 3, 16, 1);
        canvas.clearRect(0, 7, 16, 1);
        canvas.clearRect(0, 11, 16, 1);
        me.vuMeterData[i][j] = me.vuDataCanvas.toDataURL('image/png');
        // for debugging VU images
        /*
        var o = document.createElement('img');
        o.style.marginRight = '5px';
        o.src = vuMeterData[i][j];
        document.documentElement.appendChild(o);
        */
      }
    }

  };

  this.testCanvas = function() {

    // canvas + toDataURL();
    var c = document.createElement('canvas'),
        ctx = null;
    if (!c || typeof c.getContext === 'undefined') {
      return null;
    }
    ctx = c.getContext('2d');
    if (!ctx || typeof c.toDataURL !== 'function') {
      return null;
    }
    // just in case..
    try {
      c.toDataURL('image/png');
    } catch(e) {
      // no canvas or no toDataURL()
      return null;
    }
    // assume we're all good.
    return c;

  };

  this.init = function() {

    if (self.config.useFavIcon) {
      me.vuDataCanvas = me.testCanvas();
      if (me.vuDataCanvas && (isFirefox || isOpera)) {
        // these browsers support dynamically-updating the favicon
        me.createVUData();
      } else {
        // browser doesn't support doing this
        self.config.useFavIcon = false;
      }
    }

  };

  this.init();

};

// completely optional: Metadata/annotations/segments code

ThreeSixtyPlayer.prototype.Metadata = function(oSound, oParent) {

  soundManager._wD('Metadata()');

  var me = this,
      oBox = oSound._360data.oUI360,
      o = oBox.getElementsByTagName('ul')[0],
      oItems = o.getElementsByTagName('li'),
      i, oDuration;

  this.lastWPExec = 0;
  this.refreshInterval = 250;
  this.totalTime = 0;

  this.events = {

    whileplaying: function() {

      var width = oSound._360data.width,
          radius = oSound._360data.radius,
          fullDuration = (oSound.durationEstimate || (me.totalTime * 1000)),
          isAlt = null, j, k, d;

      for (j = 0, k = me.data.length; j < k; j++) {
        isAlt = (j % 2 === 0);
        oParent.drawSolidArc(oSound._360data.oCanvas, (isAlt ? oParent.config.segmentRingColorAlt : oParent.config.segmentRingColor), isAlt ? width : width, isAlt ? radius / 2 : radius / 2, oParent.deg2rad(360 * (me.data[i].endTimeMS / fullDuration)), oParent.deg2rad(360 * ((me.data[i].startTimeMS || 1) / fullDuration)), true);
      }
      d = new Date();
      if (d - me.lastWPExec > me.refreshInterval) {
        me.refresh();
        me.lastWPExec = d;
      }

    }

  };

  this.refresh = function() {

    // Display info as appropriate
    var j, k, index = null,
        now = oSound.position,
        metadata = oSound._360data.metadata.data;

    for (j = 0, k = metadata.length; j < k; j++) {
      if (now >= metadata[j].startTimeMS && now <= metadata[j].endTimeMS) {
        index = j;
        break;
      }
    }
    if (index !== metadata.currentItem && index < metadata.length) {
      // update
      oSound._360data.oLink.innerHTML = metadata.mainTitle + ' <span class="metadata"><span class="sm2_divider"> | </span><span class="sm2_metadata">' + metadata[index].title + '</span></span>';
      // self.setPageTitle(metadata[index].title+' | '+metadata.mainTitle);
      metadata.currentItem = index;
    }

  };

  this.strToTime = function(sTime) {
    var segments = sTime.split(':'),
        seconds = 0, j;
    for (j = segments.length; j--;) {
      seconds += parseInt(segments[j], 10) * Math.pow(60, segments.length - 1 - j); // hours, minutes
    }
    return seconds;
  };

  this.data = [];
  this.data.givenDuration = null;
  this.data.currentItem = null;
  this.data.mainTitle = oSound._360data.oLink.innerHTML;

  for (i = 0; i < oItems.length; i++) {
    this.data[i] = {
      o: null,
      title: oItems[i].getElementsByTagName('p')[0].innerHTML,
      startTime: oItems[i].getElementsByTagName('span')[0].innerHTML,
      startSeconds: me.strToTime(oItems[i].getElementsByTagName('span')[0].innerHTML.replace(/[()]/g, '')),
      duration: 0,
      durationMS: null,
      startTimeMS: null,
      endTimeMS: null,
      oNote: null
    };
  }
  oDuration = oParent.getElementsByClassName('duration', 'div', oBox);
  this.data.givenDuration = (oDuration.length ? me.strToTime(oDuration[0].innerHTML) * 1000 : 0);
  for (i = 0; i < this.data.length; i++) {
    this.data[i].duration = parseInt(this.data[i + 1] ? this.data[i + 1].startSeconds : (me.data.givenDuration ? me.data.givenDuration : oSound.durationEstimate) / 1000, 10) - this.data[i].startSeconds;
    this.data[i].startTimeMS = this.data[i].startSeconds * 1000;
    this.data[i].durationMS = this.data[i].duration * 1000;
    this.data[i].endTimeMS = this.data[i].startTimeMS + this.data[i].durationMS;
    this.totalTime += this.data[i].duration;
  }

};

if (navigator.userAgent.match(/webkit/i) && navigator.userAgent.match(/mobile/i)) {
  // iPad, iPhone etc.
  soundManager.setup({
    useHTML5Audio: true
  });
}

soundManager.setup({
  html5PollingInterval: 50, // increased framerate for whileplaying() etc.
  debugMode: (window.location.href.match(/debug=1/i)), // disable or enable debug output
  consoleOnly: true,
  flashVersion: 9,
  useHighPerformance: true/*,
  useFlashBlock: true*/
});

// FPS data, testing/debug only
if (soundManager.debugMode) {
  window.setInterval(function() {
    var p = window.threeSixtyPlayer;
    if (p && p.lastSound && p.lastSound._360data.fps && typeof window.isHome === 'undefined') {
      soundManager._writeDebug('fps: ~' + p.lastSound._360data.fps);
      p.lastSound._360data.fps = 0;
    }
  }, 1000);
}

window.ThreeSixtyPlayer = ThreeSixtyPlayer; // constructor

window.threeSixtyPlayer = new ThreeSixtyPlayer();

}(window));

// hook into SM2 init
soundManager.onready(threeSixtyPlayer.init);
