/*
* Copyright (c) 2003 Nokia Corporation and/or its subsidiary(-ies).
* All rights reserved.
* This component and the accompanying materials are made available
* under the terms of "Eclipse Public License v1.0"
* which accompanies this distribution, and is available
* at the URL "http://www.eclipse.org/legal/epl-v10.html".
*
* Initial Contributors:
* Nokia Corporation - initial contribution.
*
* Contributors:
*
* Description:
*
*/


package javax.microedition.m3g;

public class Mesh extends Node
{
    //------------------------------------------------------------------
    // Instance data
    //------------------------------------------------------------------

    private VertexBuffer vertices;
    private Appearance[] appearances;
    private IndexBuffer[] triangles;

    static private IndexBuffer[] tempTrianglesArray;
    static private Appearance[]  tempAppearanceArray;

    static private IndexBuffer tempTriangles;
    static private Appearance  tempAppearance;

    //------------------------------------------------------------------
    // Constructor(s)
    //------------------------------------------------------------------

    Mesh(int handle)
    {
        super(handle);
        updateReferences();
    }

    public Mesh(VertexBuffer vertices,
                IndexBuffer[] triangles,
                Appearance[] appearances)
    {
        super(createHandle(vertices, triangles, appearances));
        updateReferences();
    }

    public Mesh(VertexBuffer vertices,
                IndexBuffer triangles,
                Appearance appearance)
    {
        super(createHandle(vertices, triangles, appearance));
        updateReferences();
    }

    //------------------------------------------------------------------
    // Public methods
    //------------------------------------------------------------------

    public void setAppearance(int index, Appearance appearance)
    {
        _setAppearance(handle, index, appearance != null ? appearance.handle : 0);
        appearances[index] = appearance;
    }

    public Appearance getAppearance(int index)
    {
        return appearances[index];
    }

    public IndexBuffer getIndexBuffer(int index)
    {
        return triangles[index];
    }

    public VertexBuffer getVertexBuffer()
    {
        return vertices;
    }

    public int getSubmeshCount()
    {
        return _getSubmeshCount(handle);
    }

    //------------------------------------------------------------------
    // Private methods
    //------------------------------------------------------------------

    static void verifyParams(VertexBuffer vertices,
                             IndexBuffer[] triangles,
                             Appearance[] appearances)
    {
        if (vertices == null || triangles == null)
        {
            throw new NullPointerException();
        }
        if (triangles.length == 0
                || appearances != null && appearances.length < triangles.length)
        {
            throw new IllegalArgumentException();
        }
        if (triangles.length == 0)
        {
            throw new IllegalArgumentException();
        }
        for (int i = 0; i < triangles.length; ++i)
        {
            if (triangles[i] == null)
            {
                throw new NullPointerException();
            }
        }
    }

    static void verifyParams(VertexBuffer vertices,
                             IndexBuffer triangles)
    {
        if (vertices == null || triangles == null)
        {
            throw new NullPointerException();
        }
    }

    void updateReferences()
    {
        triangles = new IndexBuffer[_getSubmeshCount(handle)];
        appearances = new Appearance[triangles.length];

        vertices = (VertexBuffer)getInstance(_getVertexBuffer(handle));

        for (int i = 0; i < triangles.length; i++)
        {
            triangles[i] = (IndexBuffer)getInstance(_getIndexBuffer(handle, i));
            appearances[i] = (Appearance)getInstance(_getAppearance(handle, i));
        }
    }

    static int createHandle(VertexBuffer vertices,
                            IndexBuffer[] triangles,
                            Appearance[] appearances)
    {

        tempTrianglesArray = triangles;
        tempAppearanceArray = appearances;

        // Verify parameters
        verifyParams(vertices, triangles, appearances);

        // Init the native side
        int[] hTriangles = new int[triangles.length];
        int[] hAppearances = null;

        if (appearances != null)
        {
            hAppearances = new int[appearances.length];
        }

        for (int i = 0; i < triangles.length; i++)
        {
            hTriangles[i] = triangles[i].handle;

            if (appearances != null)
            {
                hAppearances[i] = appearances[i] != null ? appearances[i].handle : 0;
            }
        }

        int ret =  _ctor(Interface.getHandle(),
                         vertices.handle,
                         hTriangles,
                         hAppearances);


        tempTrianglesArray = null;
        tempAppearanceArray = null;

        return ret;

    }

    static int createHandle(VertexBuffer vertices,
                            IndexBuffer triangles,
                            Appearance appearance)
    {

        tempTriangles  = triangles;
        tempAppearance = appearance;

        verifyParams(vertices, triangles);

        // Init the native side
        int[] hTriangles = new int[1];
        int[] hAppearances = null;

        hTriangles[0] = triangles.handle;

        if (appearance != null)
        {
            hAppearances = new int[1];
            hAppearances[0] = appearance.handle;
        }

        int ret =  _ctor(Interface.getHandle(),
                         vertices.handle,
                         hTriangles,
                         hAppearances);


        tempTriangles  = null;
        tempAppearance = null;


        return ret;

    }

    // Native methods
    private static native int _ctor(int hInstance,
                                    int hVertices,
                                    int[] hTriangles,
                                    int[] hAppearances);
    private static native void _setAppearance(int handle, int index, int hAppearance);
    private static native int _getAppearance(int handle, int index);
    private static native int _getIndexBuffer(int handle, int index);
    private static native int _getVertexBuffer(int handle);
    private static native int _getSubmeshCount(int handle);
}