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/*
 * Copyright 2010-2013 JetBrains s.r.o.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.jetbrains.jet.codegen.context;

import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.jetbrains.jet.codegen.JvmCodegenUtil;
import org.jetbrains.jet.codegen.OwnerKind;
import org.jetbrains.jet.codegen.StackValue;
import org.jetbrains.jet.codegen.binding.MutableClosure;
import org.jetbrains.jet.codegen.state.GenerationState;
import org.jetbrains.jet.lang.descriptors.*;
import org.jetbrains.jet.lang.resolve.java.AsmTypeConstants;
import org.jetbrains.org.objectweb.asm.Label;

public class MethodContext extends CodegenContext {
    private final boolean isInliningLambda;
    private Label methodStartLabel;

    protected MethodContext(
            @NotNull FunctionDescriptor contextDescriptor,
            @NotNull OwnerKind contextKind,
            @NotNull CodegenContext parentContext,
            @Nullable MutableClosure closure,
            boolean isInliningLambda
    ) {
        super(JvmCodegenUtil.getDirectMember(contextDescriptor), contextKind, parentContext, closure,
              parentContext.hasThisDescriptor() ? parentContext.getThisDescriptor() : null, null);
        this.isInliningLambda = isInliningLambda;
    }

    @NotNull
    @Override
    public CodegenContext getParentContext() {
        //noinspection ConstantConditions
        return super.getParentContext();
    }

    @Override
    public StackValue lookupInContext(DeclarationDescriptor d, @Nullable StackValue result, GenerationState state, boolean ignoreNoOuter) {
        if (getContextDescriptor() == d) {
            return result != null ? result : StackValue.local(0, AsmTypeConstants.OBJECT_TYPE);
        }

        return getParentContext().lookupInContext(d, result, state, ignoreNoOuter);
    }

    @Override
    public boolean isStatic() {
        return getParentContext().isStatic();
    }

    @Override
    public StackValue getOuterExpression(StackValue prefix, boolean ignoreNoOuter) {
        return getParentContext().getOuterExpression(prefix, false);
    }

    @Nullable
    public Label getMethodStartLabel() {
        return methodStartLabel;
    }

    public void setMethodStartLabel(@NotNull Label methodStartLabel) {
        this.methodStartLabel = methodStartLabel;
    }

    @Override
    public String toString() {
        return "Method: " + getContextDescriptor();
    }

    public boolean isInlineFunction() {
        DeclarationDescriptor descriptor = getContextDescriptor();
        if (descriptor instanceof SimpleFunctionDescriptor) {
            return ((SimpleFunctionDescriptor) descriptor).getInlineStrategy().isInline();
        }
        return false;
    }

    public boolean isInliningLambda() {
        return isInliningLambda;
    }

    public boolean isSpecialStackValue(StackValue stackValue) {
        if (isInliningLambda && stackValue instanceof StackValue.Composed) {
            StackValue prefix = ((StackValue.Composed) stackValue).prefix;
            StackValue suffix = ((StackValue.Composed) stackValue).suffix;
            if (prefix instanceof StackValue.Local && ((StackValue.Local) prefix).index == 0) {
                return suffix instanceof StackValue.Field;
            }
        }
        return false;
    }
}