/*
 * Copyright (c) 2003 Sun Microsystems, Inc. All Rights Reserved.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 * 
 * - Redistribution of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * 
 * - Redistribution in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * 
 * Neither the name of Sun Microsystems, Inc. or the names of
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 * 
 * This software is provided "AS IS," without a warranty of any kind. ALL
 * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
 * INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
 * PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
 * MIDROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
 * ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
 * DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN OR
 * ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR FOR
 * DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
 * DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
 * ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
 * SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
 * 
 * You acknowledge that this software is not designed or intended for use
 * in the design, construction, operation or maintenance of any nuclear
 * facility.
 * 
 * Sun gratefully acknowledges that this software was originally authored
 * and developed by Kenneth Bradley Russell and Christopher John Kline.
 */

package net.java.games.gluegen.opengl;

import java.io.*;
import java.util.*;
import net.java.games.gluegen.*;
import net.java.games.gluegen.cgram.types.*;

public class CGLPAWrapperEmitter extends CMethodBindingEmitter
{
  private static final CommentEmitter defaultCommentEmitter =
    new CGLPAWrapperCommentEmitter();

  private CMethodBindingEmitter emitterBeingWrapped;
  private String glFuncPtrTypedefValue;
  private static String procAddressJavaTypeName =
    JavaType.createForClass(Long.TYPE).jniTypeName();

  public CGLPAWrapperEmitter(CMethodBindingEmitter methodToWrap)
  {    
    super(
      new MethodBinding(methodToWrap.getBinding()) {
        public String getName() {
          return GLEmitter.WRAP_PREFIX + super.getName();
        }
      },
      methodToWrap.getIsOverloadedBinding(),
      methodToWrap.getJavaPackageName(),
      methodToWrap.getJavaClassName(),
      methodToWrap.getIsJavaMethodStatic(),
      methodToWrap.getDefaultOutput()
      );

    if (methodToWrap.getReturnValueCapacityExpression() != null) {
      setReturnValueCapacityExpression(methodToWrap.getReturnValueCapacityExpression());
    }
    if (methodToWrap.getReturnValueLengthExpression() != null) {
      setReturnValueLengthExpression(methodToWrap.getReturnValueLengthExpression());
    }
    setTemporaryCVariableDeclarations(methodToWrap.getTemporaryCVariableDeclarations());
    setTemporaryCVariableAssignments (methodToWrap.getTemporaryCVariableAssignments ());
    
    setCommentEmitter(defaultCommentEmitter);
  }
  
  protected int emitArguments(PrintWriter writer)
  {
    int numEmitted = super.emitArguments(writer);
    if (numEmitted > 0)
    {
      writer.print(", ");
    }
    //writer.print("long glProcAddress");
    writer.print(procAddressJavaTypeName);
    writer.print(" glProcAddress");
    ++numEmitted;

    return numEmitted;
  }

  protected void emitBodyVariableDeclarations(PrintWriter writer)
  {
    // create variable for the function pointer with the right type, and set
    // it to the value of the passed-in glProcAddress 
    FunctionSymbol cSym = getBinding().getCSymbol();
    String funcPointerTypedefName =
      GLEmitter.getGLFunctionPointerTypedefName(cSym);
    
    writer.print("  ");
    writer.print(funcPointerTypedefName);
    writer.print(" ptr_");
    writer.print(cSym.getName());
    writer.println(";");

    super.emitBodyVariableDeclarations(writer);
  }

  protected void emitBodyVariablePreCallSetup(PrintWriter writer,
                                              boolean emittingPrimitiveArrayCritical)
  {
    super.emitBodyVariablePreCallSetup(writer, emittingPrimitiveArrayCritical);

    if (!emittingPrimitiveArrayCritical) {
      // set the function pointer to the value of the passed-in glProcAddress
      FunctionSymbol cSym = getBinding().getCSymbol();
      String funcPointerTypedefName =
        GLEmitter.getGLFunctionPointerTypedefName(cSym);

      String ptrVarName = "ptr_" + cSym.getName();
    
      writer.print("  ");
      writer.print(ptrVarName);
      writer.print(" = (");
      writer.print(funcPointerTypedefName);
      writer.println(") (intptr_t) glProcAddress;");

      writer.println("  assert(" + ptrVarName + " != NULL);");
    }
  }

  // FIXME: refactor this and the superclass version so we don't have to copy
  // the whole function
  protected void emitBodyCallCFunction(PrintWriter writer)
  {
    // Make the call to the actual C function
    writer.print("  ");

    // WARNING: this code assumes that the return type has already been
    // typedef-resolved.
    Type cReturnType = getBinding().getCReturnType();

    if (!cReturnType.isVoid()) {
      writer.print("_res = ");
    }

    // !!!!!!!!! BEGIN CHANGES FROM SUPERCLASS METHOD

    MethodBinding binding = getBinding();
    if (binding.hasContainingType()) {
      // Cannot call GL func through function pointer
      throw new IllegalStateException(
        "Cannot call GL func through function pointer: " + binding);
    }

    // call throught the run-time function pointer
    writer.print("(* ptr_");
    writer.print(binding.getCSymbol().getName());
    writer.print(") ");
    
    // !!!!!!!!! END CHANGES FROM SUPERCLASS METHOD 
  
    
    writer.print("(");
    for (int i = 0; i < binding.getNumArguments(); i++) {
      if (i != 0) {
        writer.print(", ");
      }
      JavaType javaType = binding.getJavaArgumentType(i);
      // Handle case where only param is void.
      if (javaType.isVoid()) {
        // Make sure this is the only param to the method; if it isn't,
        // there's something wrong with our parsing of the headers.
        assert(binding.getNumArguments() == 1);
        continue;
      } 

      if (javaType.isJNIEnv()) {
        writer.print("env");
      } else if (binding.isArgumentThisPointer(i)) {
        writer.print(CMethodBindingEmitter.cThisArgumentName());
      } else {
        writer.print("(");
        writer.print(binding.getCSymbol().getArgumentType(i).getName());
        writer.print(") ");
        if (binding.getCArgumentType(i).isPointer() && binding.getJavaArgumentType(i).isPrimitive()) {
          writer.print("(intptr_t) ");
        }
        if (javaType.isArray() || javaType.isNIOBuffer()) {
          writer.print(pointerConversionArgumentName(i));
          if (javaArgTypeNeedsDataCopy(javaType)) {
            writer.print("_copy");
          }
        } else {
          if (javaType.isString()) { writer.print("_UTF8"); }
          writer.print(binding.getArgumentName(i));          
        }
      }
    }
    writer.println(");");
  }

  protected String jniMangle(MethodBinding binding) {
    StringBuffer buf = new StringBuffer();
    buf.append(super.jniMangle(binding));
    jniMangle(Long.TYPE, buf);
    return buf.toString();
  }

  /** This class emits the comment for the wrapper method */
  private static class CGLPAWrapperCommentEmitter extends CMethodBindingEmitter.DefaultCommentEmitter {
    protected void emitBeginning(FunctionEmitter methodEmitter, PrintWriter writer) {
      writer.print(" -- FIXME: IMPLEMENT COMMENT FOR CGLPAWrapperCommentEmitter -- ");
    }
  }
} // end class CGLPAWrapperEmitter