enum MP_Anchor {TopLeft, TopRight, BottomLeft, BottomRight};
enum MP_RT { Pixel, Percentage };

class MP_RectType {
    var x : MP_RT = MP_RT.Pixel;
    var y : MP_RT = MP_RT.Pixel;
    var width : MP_RT = MP_RT.Pixel;
    var height : MP_RT = MP_RT.Pixel;
}
class MP_Style {
    var background : Texture2D;
    var backgroundColor : Color = Color.clear;
    var normalTexture : Texture2D;
    var normalColor : Color = Color.clear;
    var highlightTexture : Texture2D;
    var highlightColor : Color = Color.white;
    var textColor : Color = Color.black;
}

class MP_Marg {
    var top : float = 0;
    var left : float = 0;
    var right : float = 0;
    var bottom : float = 0;
}

class MP_PlayList {
    var anchor : MP_Anchor = MP_Anchor.TopLeft;
    var rect : Rect = Rect(0,0,300,300);
    var rectType : MP_RectType;
    var margin : MP_Marg;
    var style : MP_Style;
}
var tracks : AudioClip[];
var background : Texture2D;
var playList : MP_PlayList;

//------------------------------------------------------------
private var options = ['A','B','C','D','E','F'];
private var selectedOption = 0;
private var scrollPosition : Vector2 = new Vector2(0,0);
private var playListStyle : GUIStyle = GUIStyle();
private var bgStyle : GUIStyle = GUIStyle();
private var playListRect : Rect;
private var plTexture : Texture2D;
private var isPl : boolean = false;
private var playMode : int = 0;
//start--------------------------------------------------------------------------------
function Start() {
    OtherStart();
    if (audio==null) gameObject.AddComponent(AudioSource);
    audio.playOnAwake = false;
    audio.clip = tracks[0];
    options = new String[tracks.length];
    for (i = 0;i<tracks.length;i++) {
        options[i] = tracks[i].name;
    }
    PlayListStart();
}

function OtherStart() {
    bgStyle.normal.background = background;
}

function PlayListStart() {
    if (playList.style.normalTexture!=null) {
        playListStyle.normal.background = playList.style.normalTexture;
    } else {
        playListStyle.normal.background = ColorToTexture2D(playList.style.normalColor);
    }
    if (playList.style.highlightTexture!=null) {
        playListStyle.onNormal.background = playList.style.highlightTexture;
    } else {
        playListStyle.onNormal.background = ColorToTexture2D(playList.style.highlightColor);
    }
    playListStyle.normal.textColor = playList.style.textColor;
    playListStyle.onNormal.textColor = playList.style.textColor;
    if (playList.style.background!=null) {
        plTexture = playList.style.background;
    } else {
        plTexture = ColorToTexture2D(playList.style.backgroundColor);
    }
}
//main code-----------------------------------------------------------------------------
function Update() {
    if (playMode!=3 && !audio.isPlaying && isPl) {
        selectedOption++;
    }
    if (selectedOption>=tracks.length) {
        selectedOption = 0;
        if (playMode==0) {
            isPl = false;
        }
    }
    if (isPl && !audio.isPlaying) {
        audio.Play();
    }
}

function MouseClick(position:Vector2) {
    Debug.Log("works");
    position.x += Screen.width/2;
    position.y += Screen.height/2;
    var tempRect = playListRect;
    tempRect.x -= playList.margin.left;
    tempRect.y -= playList.margin.top;
    tempRect.width -= (playList.margin.left+playList.margin.right);
    tempRect.height -= (playList.margin.top+playList.margin.bottom);
    if (tempRect.Contains(position)) {
        isPl = true;
        if (audio.clip!=tracks[selectedOption]) audio.clip = tracks[selectedOption];
        audio.Play();
    }
}
//gui------------------------------------------------------------------------------------
function OnGUI() {
    GUI.Label(Rect(0,0,Screen.width,Screen.height),"",bgStyle);
    PlayList();
}

function PlayList() {
    var isClick = (Event.current.type == EventType.MouseUp && Event.current.clickCount == 1);
    playListRect = RectGetter(playList.rect,playList.anchor,playList.rectType);
    var marg = playList.margin;
    var st = GUIStyle();
    st.normal.background = plTexture;
    GUILayout.BeginArea(playListRect,st);
    GUILayout.BeginVertical("");
    GUILayout.Space(marg.top);
    GUILayout.BeginHorizontal("");
    GUILayout.Space(marg.left);
    scrollPosition = GUILayout.BeginScrollView(scrollPosition, false, true);
    selectedOption = GUILayout.SelectionGrid(selectedOption, options, 1, playListStyle);
    if(isClick)
        MouseClick(Event.current.mousePosition);
    GUILayout.EndScrollView();
    GUILayout.Space(marg.right);
    GUILayout.EndHorizontal();
    GUILayout.Space(marg.bottom);
    GUILayout.EndVertical();
    GUILayout.EndArea();
}





function RectGetter(rect:Rect,type:MP_Anchor,rt:MP_RectType) {
    if (rt.x == MP_RT.Percentage) {
        rect.x = Screen.width*rect.x;
    }
    if (rt.y == MP_RT.Percentage) {
        rect.y = Screen.height*rect.y;
    }
    if (rt.width == MP_RT.Percentage) {
        rect.width = Screen.width*rect.width;
    }
    if (rt.height == MP_RT.Percentage) {
        rect.height = Screen.height*rect.height;
    }
    if (type == MP_Anchor.TopRight || type == MP_Anchor.BottomRight) {
        rect.x = Screen.width-rect.x;
    }
    if (type == MP_Anchor.BottomLeft || type == MP_Anchor.BottomRight) {
        rect.y = Screen.height-rect.y;
    }
    return rect;
}


private static var C2T_textures = new Hashtable();
static function ColorToTexture2D(color : Color) : Texture2D
{
    var colorHash : int = color.GetHashCode();
    //Debug.Log(colorHash);
    var texture : Texture2D = C2T_textures[colorHash];
    if(texture) return texture;
    texture = new Texture2D(1,1);
    texture.SetPixel(0,0,color);
    texture.Apply();
    C2T_textures[colorHash] = texture;
    return texture;
}