package org.jruby.ir.instructions;

import org.jruby.Ruby;
import org.jruby.RubyClass;
import org.jruby.internal.runtime.methods.InterpretedIRMethod;
import org.jruby.ir.IRVisitor;
import org.jruby.ir.IRModuleBody;
import org.jruby.ir.Operation;
import org.jruby.ir.operands.Operand;
import org.jruby.ir.operands.Variable;
import org.jruby.ir.transformations.inlining.InlinerInfo;
import org.jruby.javasupport.util.RuntimeHelpers;
import org.jruby.runtime.Block;
import org.jruby.runtime.DynamicScope;
import org.jruby.runtime.ThreadContext;
import org.jruby.runtime.Visibility;
import org.jruby.runtime.builtin.IRubyObject;

import java.util.Map;

public class DefineMetaClassInstr extends Instr implements ResultInstr {
    private IRModuleBody metaClassBody;
    private Operand object;
    private Variable result;
    
    public DefineMetaClassInstr(Variable result, Operand object, IRModuleBody metaClassBody) {
        super(Operation.DEF_META_CLASS);
        
        assert result != null: "DefineMetaClassInstr result is null";
        
        this.metaClassBody = metaClassBody;
        this.object = object;
        this.result = result;
    }

    public Operand[] getOperands() {
        return new Operand[]{object};
    }
    
    public Variable getResult() {
        return result;
    }

    public void updateResult(Variable v) {
        this.result = v;
    }

    @Override
    public void simplifyOperands(Map<Operand, Operand> valueMap, boolean force) {
        object = object.getSimplifiedOperand(valueMap, force);
    }

    @Override
    public String toString() {
        return super.toString() + "(" + metaClassBody.getName() + ", " + object + ", " + metaClassBody.getFileName() + ")";
    }

    @Override
    public Instr cloneForInlining(InlinerInfo ii) {
        // SSS: So, do we clone the meta-class body scope or not?
        return new DefineMetaClassInstr(ii.getRenamedVariable(result), object.cloneForInlining(ii), metaClassBody);
    }

    @Override
    public Object interpret(ThreadContext context, DynamicScope currDynScope, IRubyObject self, Object[] temp, Block block) {
        Ruby runtime = context.getRuntime();
        IRubyObject obj = (IRubyObject)object.retrieve(context, self, currDynScope, temp);
        
        RubyClass singletonClass = RuntimeHelpers.getSingletonClass(runtime, obj);
        metaClassBody.getStaticScope().setModule(singletonClass);
		  return new InterpretedIRMethod(metaClassBody, Visibility.PUBLIC, singletonClass);
    }

    @Override
    public void visit(IRVisitor visitor) {
        visitor.DefineMetaClassInstr(this);
    }

    public IRModuleBody getMetaClassBody() {
        return metaClassBody;
    }

    public Operand getObject() {
        return object;
    }
}
