package net.minecraftforge.client.model.techne;

import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.net.URL;
import java.util.Arrays;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.zip.ZipEntry;
import java.util.zip.ZipException;
import java.util.zip.ZipFile;
import java.util.zip.ZipInputStream;

import javax.imageio.ImageIO;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;

import org.lwjgl.opengl.GL11;
import org.w3c.dom.Document;
import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;

import cpw.mods.fml.common.FMLLog;
import cpw.mods.fml.relauncher.Side;
import cpw.mods.fml.relauncher.SideOnly;

import net.minecraft.client.Minecraft;
import net.minecraft.client.model.ModelBase;
import net.minecraft.client.model.ModelRenderer;
import net.minecraftforge.client.model.IModelCustom;
import net.minecraftforge.client.model.ModelFormatException;

/**
 * Techne model importer, based on iChun's Hats importer
 */
@SideOnly(Side.CLIENT)
public class TechneModel extends ModelBase implements IModelCustom {
    public static final List<String> cubeTypes = Arrays.asList(
            "d9e621f7-957f-4b77-b1ae-20dcd0da7751",
            "de81aa14-bd60-4228-8d8d-5238bcd3caaa"
            );
    
    private String fileName;
    private Map<String, byte[]> zipContents = new HashMap<String, byte[]>();
    
    private Map<String, ModelRenderer> parts = new LinkedHashMap<String, ModelRenderer>();
    private String texture = null;
    private int textureName;
    private boolean textureNameSet = false;

    public TechneModel(String fileName, URL resource) throws ModelFormatException
    {
        this.fileName = fileName;
        loadTechneModel(resource);
    }
    
    private void loadTechneModel(URL fileURL) throws ModelFormatException
    {
        try
        {
            ZipInputStream zipInput = new ZipInputStream(fileURL.openStream());
            
            ZipEntry entry;
            while ((entry = zipInput.getNextEntry()) != null)
            {
                byte[] data = new byte[(int) entry.getSize()];
                // For some reason, using read(byte[]) makes reading stall upon reaching a 0x1E byte
                int i = 0;
                while (zipInput.available() > 0 && i < data.length)
                {
                    data[i++] = (byte)zipInput.read();
                }
                zipContents.put(entry.getName(), data);
            }
            
            byte[] modelXml = zipContents.get("model.xml");
            if (modelXml == null)
            {
                throw new ModelFormatException("Model " + fileName + " contains no model.xml file");
            }
            
            DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
            DocumentBuilder documentBuilder = documentBuilderFactory.newDocumentBuilder();
            Document document = documentBuilder.parse(new ByteArrayInputStream(modelXml));
            
            NodeList nodeListTechne = document.getElementsByTagName("Techne");
            if (nodeListTechne.getLength() < 1)
            {
                throw new ModelFormatException("Model " + fileName + " contains no Techne tag");
            }
            
            NodeList nodeListModel = document.getElementsByTagName("Model");
            if (nodeListModel.getLength() < 1)
            {
                throw new ModelFormatException("Model " + fileName + " contains no Model tag");
            }
            
            NamedNodeMap modelAttributes = nodeListModel.item(0).getAttributes();
            if (modelAttributes == null)
            {
                throw new ModelFormatException("Model " + fileName + " contains a Model tag with no attributes");
            }
            
            Node modelTexture = modelAttributes.getNamedItem("texture");
            if (modelTexture != null)
            {
                texture = modelTexture.getTextContent();
            }
            
            NodeList shapes = document.getElementsByTagName("Shape");
            for (int i = 0; i < shapes.getLength(); i++)
            {
                Node shape = shapes.item(i);
                NamedNodeMap shapeAttributes = shape.getAttributes();
                if (shapeAttributes == null)
                {
                    throw new ModelFormatException("Shape #" + (i + 1) + " in " + fileName + " has no attributes");
                }
                
                Node name = shapeAttributes.getNamedItem("name");
                String shapeName = null;
                if (name != null)
                {
                    shapeName = name.getNodeValue();
                }
                if (shapeName == null)
                {
                    shapeName = "Shape #" + (i + 1);
                }
                
                String shapeType = null;
                Node type = shapeAttributes.getNamedItem("type");
                if (type != null)
                {
                    shapeType = type.getNodeValue();
                }
                if (shapeType != null && !cubeTypes.contains(shapeType))
                {
                    FMLLog.warning("Model shape [" + shapeName + "] in " + fileName + " is not a cube, ignoring");
                    continue;
                }
                
                try
                {
                    boolean mirrored = false;
                    String[] offset = new String[3];
                    String[] position = new String[3];
                    String[] rotation = new String[3];
                    String[] size = new String[3];
                    String[] textureOffset = new String[2];
                    
                    NodeList shapeChildren = shape.getChildNodes();
                    for (int j = 0; j < shapeChildren.getLength(); j++)
                    {
                        Node shapeChild = shapeChildren.item(j);
                        
                        String shapeChildName = shapeChild.getNodeName();
                        String shapeChildValue = shapeChild.getTextContent();
                        if (shapeChildValue != null)
                        {
                            shapeChildValue = shapeChildValue.trim();
                            
                            if (shapeChildName.equals("IsMirrored"))
                            {
                                mirrored = !shapeChildValue.equals("False");
                            }
                            else if (shapeChildName.equals("Offset"))
                            {
                                offset = shapeChildValue.split(",");
                            }
                            else if (shapeChildName.equals("Position"))
                            {
                                position = shapeChildValue.split(",");
                            }
                            else if (shapeChildName.equals("Rotation"))
                            {
                                rotation = shapeChildValue.split(",");
                            }
                            else if (shapeChildName.equals("Size"))
                            {
                                size = shapeChildValue.split(",");
                            }
                            else if (shapeChildName.equals("TextureOffset"))
                            {
                                textureOffset = shapeChildValue.split(",");
                            }
                        }
                    }
                    
                    // That's what the ModelBase subclassing is needed for
                    ModelRenderer cube = new ModelRenderer(this, Integer.parseInt(textureOffset[0]), Integer.parseInt(textureOffset[1]));
                    cube.mirror = mirrored;
                    cube.addBox(Float.parseFloat(offset[0]), Float.parseFloat(offset[1]), Float.parseFloat(offset[2]), Integer.parseInt(size[0]), Integer.parseInt(size[1]), Integer.parseInt(size[2]));
                    cube.setRotationPoint(Float.parseFloat(position[0]), Float.parseFloat(position[1]) - 23.4F, Float.parseFloat(position[2]));

                    cube.rotateAngleX = (float)Math.toRadians(Float.parseFloat(rotation[0]));
                    cube.rotateAngleY = (float)Math.toRadians(Float.parseFloat(rotation[1]));
                    cube.rotateAngleZ = (float)Math.toRadians(Float.parseFloat(rotation[2]));

                    parts.put(shapeName, cube);
                }
                catch (NumberFormatException e)
                {
                    FMLLog.warning("Model shape [" + shapeName + "] in " + fileName + " contains malformed integers within its data, ignoring");
                    e.printStackTrace();
                }
            }
        }
        catch (ZipException e)
        {
            throw new ModelFormatException("Model " + fileName + " is not a valid zip file");
        }
        catch (IOException e)
        {
            throw new ModelFormatException("Model " + fileName + " could not be read", e);
        }
        catch (ParserConfigurationException e)
        {
            // hush
        }
        catch (SAXException e)
        {
            throw new ModelFormatException("Model " + fileName + " contains invalid XML", e);
        }
    }
    
    private void bindTexture()
    {
        /* TODO: Update to 1.6
        if (texture != null)
        {
            if (!textureNameSet)
            {
                try
                {
                    byte[] textureEntry = zipContents.get(texture);
                    if (textureEntry == null)
                    {
                        throw new ModelFormatException("Model " + fileName + " has no such texture " + texture);
                    }
                    
                    BufferedImage image = ImageIO.read(new ByteArrayInputStream(textureEntry));
                    textureName = Minecraft.getMinecraft().renderEngine.allocateAndSetupTexture(image);
                    textureNameSet = true;
                }
                catch (ZipException e)
                {
                    throw new ModelFormatException("Model " + fileName + " is not a valid zip file");
                }
                catch (IOException e)
                {
                    throw new ModelFormatException("Texture for model " + fileName + " could not be read", e);
                }
            }
            
            if (textureNameSet)
            {
                GL11.glBindTexture(GL11.GL_TEXTURE_2D, textureName);
                Minecraft.getMinecraft().renderEngine.resetBoundTexture();
            }
        }
        */
    }
    
    @Override
    public String getType()
    {
        return "tcn";
    }

    @Override
    public void renderAll()
    {
        bindTexture();
        
        for (ModelRenderer part : parts.values())
        {
            part.renderWithRotation(1.0F);
        }
    }

    @Override
    public void renderPart(String partName)
    {        
        ModelRenderer part = parts.get(partName);
        if (part != null)
        {
            bindTexture();
            
            part.renderWithRotation(1.0F);
        }
    }
}
