/*
 * Copyright 2014, Google Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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 */

package org.jf.smalidea.dexlib.instruction;

import com.google.common.base.Function;
import com.google.common.collect.Lists;
import org.jf.dexlib2.Opcode;
import org.jf.dexlib2.iface.instruction.SwitchElement;
import org.jf.dexlib2.iface.instruction.formats.SparseSwitchPayload;
import org.jf.smalidea.psi.impl.*;
import org.jf.smalidea.util.InstructionUtils;

import javax.annotation.Nonnull;
import java.util.List;

public class SmalideaSparseSwitchPayload extends SmalideaInstruction implements SparseSwitchPayload {
    public SmalideaSparseSwitchPayload(@Nonnull SmaliInstruction instruction) {
        super(instruction);
    }

    @Nonnull @Override public List<? extends SwitchElement> getSwitchElements() {
        List<SmaliSparseSwitchElement> elements = psiInstruction.getSparseSwitchElements();

        SmaliMethod smaliMethod = psiInstruction.getParentMethod();
        SmaliInstruction sparseSwitchInstruction = InstructionUtils.findFirstInstructionWithTarget(
                smaliMethod, Opcode.SPARSE_SWITCH, psiInstruction.getOffset());
        final int baseOffset;

        if (sparseSwitchInstruction == null) {
            baseOffset = 0;
        } else {
            baseOffset = sparseSwitchInstruction.getOffset();
        }

        return Lists.transform(elements, new Function<SmaliSparseSwitchElement, SwitchElement>() {
            @Override public SwitchElement apply(final SmaliSparseSwitchElement element) {
                return new SwitchElement() {
                    @Override public int getKey() {
                        return (int)element.getKey().getIntegralValue();
                    }

                    @Override public int getOffset() {
                        SmaliLabelReference labelReference = element.getTarget();
                        if (labelReference == null) {
                            return 0;
                        }

                        SmaliLabel label = labelReference.resolve();
                        if (label == null) {
                            return 0;
                        }

                        return (label.getOffset() - baseOffset) / 2;
                    }
                };
            }
        });
    }

    @Override public int getCodeUnits() {
        return psiInstruction.getInstructionSize()/2;
    }
}