package org.simantics.scl.compiler.constants;

import java.util.Arrays;

import org.cojen.classfile.TypeDesc;
import org.simantics.scl.compiler.common.exceptions.InternalCompilerError;
import org.simantics.scl.compiler.internal.codegen.references.Val;
import org.simantics.scl.compiler.internal.codegen.types.JavaTypeTranslator;
import org.simantics.scl.compiler.internal.codegen.utils.ClassBuilder;
import org.simantics.scl.compiler.internal.codegen.utils.MethodBuilder;
import org.simantics.scl.compiler.top.SCLCompilerConfiguration;
import org.simantics.scl.compiler.types.Type;
import org.simantics.scl.compiler.types.Types;

public class JavaMethod extends FunctionValue {
    
    String className;
    String methodName;
    
    TypeDesc returnTypeDesc;
    TypeDesc[] parameterTypeDescs;
    
    boolean virtual;
    
    public JavaMethod(boolean virtual, String className, String methodName,
            Type effect,
            TypeDesc returnTypeDesc, TypeDesc[] parameterTypeDescs,
            Type returnType, Type ... parameterTypes) {
        super(Types.freeVarsArray(
                Types.functionE(parameterTypes, effect, returnType)),
                effect,
                returnType, parameterTypes);
        if(SCLCompilerConfiguration.DEBUG) {
            if(className == null)
                throw new NullPointerException();
            if(methodName == null)
                throw new NullPointerException();
            if(parameterTypeDescs != null)
                for(TypeDesc td : parameterTypeDescs)
                    if(td.equals(TypeDesc.VOID))
                        throw new InternalCompilerError();
        }
        ClassBuilder.checkClassName(className);
        this.virtual = virtual;
        this.className = className;
        this.methodName = methodName;
        this.returnTypeDesc = returnTypeDesc;
        this.parameterTypeDescs = parameterTypeDescs;
    }
    
    public JavaMethod(boolean virtual, String className, String methodName, Type effect,
            Type returnType, Type ... parameterTypes) {
        this(virtual, className, methodName, effect, null, null, returnType, parameterTypes);
    }
   
    @Override
    public Type applyExact(MethodBuilder mb, Val[] parameters) {
        if(returnTypeDesc == null) {
            JavaTypeTranslator tt = mb.getJavaTypeTranslator();
            returnTypeDesc = tt.toTypeDesc(returnType);
            parameterTypeDescs = JavaTypeTranslator.filterVoid(
                    tt.toTypeDescs(Arrays.copyOfRange(parameterTypes, 1, parameterTypes.length)));
        }
              
        mb.push(parameters, parameterTypes);
        if(virtual)
            mb.invokeVirtual(className, methodName, returnTypeDesc, parameterTypeDescs);
        else
            mb.invokeInterface(className, methodName, returnTypeDesc, parameterTypeDescs);
        
        return getReturnType();
    }

    @Override
    public String toString() {
        return className + "." + methodName;
    }

}