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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;

import org.jetbrains.annotations.NotNull;
import org.jetbrains.org.objectweb.asm.Type;
import org.jetbrains.jet.codegen.state.JetTypeMapper;
import org.jetbrains.jet.lang.descriptors.ClassDescriptor;
import org.jetbrains.jet.lang.descriptors.ClassKind;
import org.jetbrains.jet.lang.resolve.DescriptorUtils;
import org.jetbrains.jet.lang.resolve.java.JvmAbi;

public class FieldInfo {

    @NotNull
    public static FieldInfo createForSingleton(@NotNull ClassDescriptor fieldClassDescriptor, @NotNull JetTypeMapper typeMapper) {
        ClassKind kind = fieldClassDescriptor.getKind();
        if (kind != ClassKind.OBJECT && kind != ClassKind.CLASS_OBJECT && kind != ClassKind.ENUM_ENTRY) {
            throw new UnsupportedOperationException();
        }

        Type fieldType = typeMapper.mapType(fieldClassDescriptor);

        ClassDescriptor ownerDescriptor = kind == ClassKind.OBJECT
                                          ? fieldClassDescriptor: DescriptorUtils.getParentOfType(fieldClassDescriptor, ClassDescriptor.class);
        assert ownerDescriptor != null;
        Type ownerType = typeMapper.mapType(ownerDescriptor);

        String fieldName = kind == ClassKind.ENUM_ENTRY
                           ? fieldClassDescriptor.getName().asString()
                           : fieldClassDescriptor.getKind() == ClassKind.CLASS_OBJECT ? JvmAbi.CLASS_OBJECT_FIELD : JvmAbi.INSTANCE_FIELD;
        return new FieldInfo(ownerType, fieldType, fieldName, true);
    }

    public static FieldInfo createForHiddenField(@NotNull Type owner, Type fieldType, String fieldName) {
        return new FieldInfo(owner, fieldType, fieldName, false);
    }

    private final Type fieldType;
    private final Type ownerType;
    private final String fieldName;
    private final boolean isStatic;

    private FieldInfo(@NotNull Type ownerType, @NotNull Type fieldType, @NotNull String fieldName, boolean isStatic) {
        this.ownerType = ownerType;
        this.fieldType = fieldType;
        this.fieldName = fieldName;
        this.isStatic = isStatic;
    }

    @NotNull
    public Type getFieldType() {
        return fieldType;
    }

    @NotNull
    public Type getOwnerType() {
        return ownerType;
    }

    @NotNull
    public String getOwnerInternalName() {
        return ownerType.getInternalName();
    }

    @NotNull
    public String getFieldName() {
        return fieldName;
    }

    public boolean isStatic() {
        return isStatic;
    }

    @Override
    public String toString() {
        return String.format("%s %s.%s : %s", isStatic ? "GETSTATIC" : "GETFIELD", ownerType.getInternalName(), fieldName, fieldType);
    }
}