// ino.module.IfStmt.8632.package 
package de.dhbwstuttgart.syntaxtree.statement;
// ino.end
// ino.module.IfStmt.8632.import 
import java.util.Enumeration;
import java.util.Hashtable;
import java.util.Iterator;

import org.apache.commons.bcel6.Constants;
import org.apache.commons.bcel6.generic.ALOAD;
import org.apache.commons.bcel6.generic.ASTORE;
import org.apache.commons.bcel6.generic.BranchInstruction;
import  org.apache.commons.bcel6.generic.ClassGen;
import org.apache.commons.bcel6.generic.GOTO;
import org.apache.commons.bcel6.generic.GotoInstruction;
import org.apache.commons.bcel6.generic.IFEQ;
import org.apache.commons.bcel6.generic.IFNONNULL;
import org.apache.commons.bcel6.generic.IfInstruction;
import org.apache.commons.bcel6.generic.Instruction;
import org.apache.commons.bcel6.generic.InstructionFactory;
import org.apache.commons.bcel6.generic.InstructionHandle;
import org.apache.commons.bcel6.generic.InstructionList;
import org.apache.commons.bcel6.generic.NOP;

import de.dhbwstuttgart.typeinference.Menge;
import de.dhbwstuttgart.bytecode.ClassGenerator;
import de.dhbwstuttgart.logger.Logger;
import de.dhbwstuttgart.logger.Section;
import de.dhbwstuttgart.myexception.CTypeReconstructionException;
import de.dhbwstuttgart.myexception.JVMCodeException;
import de.dhbwstuttgart.myexception.SCExcept;
import de.dhbwstuttgart.myexception.SCStatementException;
import de.dhbwstuttgart.syntaxtree.Class;
import de.dhbwstuttgart.syntaxtree.SyntaxTreeNode;
import de.dhbwstuttgart.syntaxtree.operator.LogOp;
import de.dhbwstuttgart.syntaxtree.operator.Operator;
import de.dhbwstuttgart.syntaxtree.operator.RelOp;
import de.dhbwstuttgart.syntaxtree.type.GenericTypeVar;
import de.dhbwstuttgart.syntaxtree.type.RefType;
import de.dhbwstuttgart.syntaxtree.type.Type;
import de.dhbwstuttgart.syntaxtree.type.TypePlaceholder;
import de.dhbwstuttgart.syntaxtree.type.Void;
import de.dhbwstuttgart.typeinference.ConstraintsSet;
import de.dhbwstuttgart.typeinference.JavaCodeResult;
import de.dhbwstuttgart.typeinference.Pair;
import de.dhbwstuttgart.typeinference.ResultSet;
import de.dhbwstuttgart.typeinference.TypeinferenceResultSet;
import de.dhbwstuttgart.typeinference.assumptions.TypeAssumptions;
import de.dhbwstuttgart.typeinference.exceptions.NotImplementedException;
import de.dhbwstuttgart.typeinference.unify.Unify;




// ino.class.IfStmt.25300.declaration 
public class IfStmt extends Statement
// ino.end
// ino.class.IfStmt.25300.body
{
    // ino.method.IfStmt.25304.definition 
    public IfStmt(int offset, int variableLength)
    // ino.end
    // ino.method.IfStmt.25304.body 
    {
        super(offset,variableLength);
    }
    // ino.end
    
    // ino.attribute.hamaDebug.25307.declaration 
    public boolean hamaDebug = true;    //hama: Debug Ausgaben von mir ein- bzw. ausschalten
    // ino.end
    // ino.attribute.expr.25310.declaration 
    public Expr expr;
    // ino.end
    // ino.attribute.then_block.25313.declaration 
    public Statement then_block;
    // ino.end
    // ino.attribute.else_block.25316.declaration 
    public Statement else_block;
    // ino.end
    // ino.attribute.parserlog.25319.declaration 
    protected static Logger parserlog = Logger.getLogger("parser");
    // ino.end
    
    
    
    // ino.method.set_Expr.25322.definition 
    public void set_Expr(Expr exp)
    // ino.end
    // ino.method.set_Expr.25322.body 
    {
        this.expr = exp;
    }
    // ino.end
    
    
    
    // ino.method.set_Then_block.25325.definition 
    public void set_Then_block(Statement blk)
    // ino.end
    // ino.method.set_Then_block.25325.body 
    {
        this.then_block = blk;
    }
    // ino.end
    
    
    
    // ino.method.set_Else_block.25328.definition 
    public void set_Else_block(Statement blk)
    // ino.end
    // ino.method.set_Else_block.25328.body 
    {
        this.else_block = blk;
    }
    // ino.end
    
    // ino.method.wandleRefTypeAttributes2GenericAttributes.25349.definition 
    public void wandleRefTypeAttributes2GenericAttributes(Menge<Type> paralist, Menge<GenericTypeVar> genericMethodParameters)
    // ino.end
    // ino.method.wandleRefTypeAttributes2GenericAttributes.25349.body 
    {
        if(then_block!=null){
            then_block.wandleRefTypeAttributes2GenericAttributes(paralist,genericMethodParameters);
        }
        if(else_block!=null){
            else_block.wandleRefTypeAttributes2GenericAttributes(paralist,genericMethodParameters);
        }
        
    }
    // ino.end


	@Override
	public ConstraintsSet TYPEStmt(TypeAssumptions assumptions) {
		ConstraintsSet ret = new ConstraintsSet();
		this.setType(TypePlaceholder.fresh(this));
		
		ret.add(expr.TYPEExpr(assumptions)); // die Constraints für (expressionDesIfStmt)
		ret.add(this.then_block.TYPEStmt(assumptions));
		if(else_block!=null){
			ret.add(this.else_block.TYPEStmt(assumptions));
			if(!(else_block.getType() instanceof Void))ret.add(ConstraintsSet.createSingleConstraint(else_block.getType().TYPE(assumptions, this),this.getType().TYPE(assumptions, this)));
		}
		ret.add(ConstraintsSet.createSingleConstraint(expr.getType().TYPE(assumptions, this),new RefType("Boolean",this,0).TYPE(assumptions, this))); //(expressionDesIfStmt)<.boolean
		if(!(then_block.getType() instanceof Void))ret.add(ConstraintsSet.createSingleConstraint(then_block.getType().TYPE(assumptions, this),this.getType().TYPE(assumptions, this)));
		if(then_block.getType() instanceof Void && 
				(else_block == null || else_block.getType() instanceof Void))this.setType(new Void(this,this.getOffset()));
		return ret;
	}
	
	public int getTypeLineNumber() {
		throw new NotImplementedException();
	}



	@Override
	public JavaCodeResult printJavaCode(ResultSet resultSet) {
		JavaCodeResult ret = new JavaCodeResult("If(").attach(this.expr.printJavaCode(resultSet)).attach("){\n");
		if(this.then_block!=null)ret.attach(this.then_block.printJavaCode(resultSet));
		ret.attach("\n}else{\n");
		if(this.else_block!=null)ret.attach(this.else_block.printJavaCode(resultSet));
		ret.attach("\n}");
		return ret;
	}



	@Override
	public Menge<SyntaxTreeNode> getChildren() {
		Menge<SyntaxTreeNode> ret = new Menge<SyntaxTreeNode>();
		if(this.expr!=null)ret.add(this.expr);
		if(this.else_block!=null)ret.add(this.else_block);
		if(this.then_block!=null)ret.add(this.then_block);
		return ret;
	}

	@Override
	public InstructionList genByteCode(ClassGenerator _cg, TypeinferenceResultSet rs) {
		InstructionFactory _factory = _cg.getInstructionFactory();
		InstructionList il = new InstructionList();
		IfInstruction ifInstruction = new IFEQ(null);
		
		il.append(expr.genByteCode(_cg, rs));
		//Anmerkung: expr ist vom Typ java.lang.Boolean (per Definition)
		il.append(_factory.createInvoke("java.lang.Boolean", "booleanValue", org.apache.commons.bcel6.generic.Type.BOOLEAN, org.apache.commons.bcel6.generic.Type.NO_ARGS, Constants.INVOKEVIRTUAL));
		il.append(ifInstruction);
		il.append(then_block.genByteCode(_cg, rs));
		
		if(else_block != null && !(else_block instanceof EmptyStmt)){
			//GotoInstruction gotoInstruction = new GOTO(null);
			//il.append(gotoInstruction);
			ifInstruction.setTarget(il.append(else_block.genByteCode(_cg, rs)));
			//gotoInstruction.setTarget(il.append(new NOP()));
		}else{
			ifInstruction.setTarget(il.append(new NOP()));
		}
		
		return il;
	}
}
// ino.end