/*******************************************************************************
 * Copyright (c) 2000, 2011 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jdt.internal.debug.core.model;

import java.text.MessageFormat;
import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import org.eclipse.debug.core.DebugException;
import org.eclipse.debug.core.model.IIndexedValue;
import org.eclipse.debug.core.model.IVariable;
import org.eclipse.jdt.debug.core.IJavaArray;
import org.eclipse.jdt.debug.core.IJavaValue;

import com.sun.jdi.ArrayReference;
import com.sun.jdi.ClassNotLoadedException;
import com.sun.jdi.InvalidTypeException;
import com.sun.jdi.Value;

public class JDIArrayValue extends JDIObjectValue implements IJavaArray,
		IIndexedValue {

	private int fLength = -1;

	/**
	 * Constructs a value which is a reference to an array.
	 *
	 * @param target
	 *            debug target on which the array exists
	 * @param value
	 *            the reference to the array
	 */
	public JDIArrayValue(JDIDebugTarget target, ArrayReference value) {
		super(target, value);
	}

	/**
	 * @see IJavaArray#getValues()
	 */
	@Override
	public IJavaValue[] getValues() throws DebugException {
		List<Value> list = getUnderlyingValues();

		int count = list.size();
		IJavaValue[] values = new IJavaValue[count];
		JDIDebugTarget target = (JDIDebugTarget) getDebugTarget();
		for (int i = 0; i < count; i++) {
			Value value = list.get(i);
			values[i] = JDIValue.createValue(target, value);
		}
		return values;
	}

	/**
	 * @see IJavaArray#getValue(int)
	 */
	@Override
	public IJavaValue getValue(int index) throws DebugException {
		Value v = getUnderlyingValue(index);
		return JDIValue.createValue((JDIDebugTarget) getDebugTarget(), v);
	}

	/**
	 * @see IJavaArray#getLength()
	 */
	@Override
	public synchronized int getLength() throws DebugException {
		if (fLength == -1) {
			try {
				fLength = getArrayReference().length();
			} catch (RuntimeException e) {
				targetRequestFailed(
						MessageFormat.format(
								JDIDebugModelMessages.JDIArrayValue_exception_while_retrieving_array_length,
								e.toString()), e);
			}
		}
		return fLength;
	}

	/**
	 * @see IJavaArray#setValue(int, IJavaValue)
	 */
	@Override
	public void setValue(int index, IJavaValue value) throws DebugException {
		try {
			getArrayReference().setValue(index,
					((JDIValue) value).getUnderlyingValue());
		} catch (IndexOutOfBoundsException e) {
			throw e;
		} catch (InvalidTypeException e) {
			targetRequestFailed(
					MessageFormat.format(
							JDIDebugModelMessages.JDIArrayValue_exception_while_setting_value_in_array,
							 e.toString()), e);
		} catch (ClassNotLoadedException e) {
			targetRequestFailed(
					MessageFormat.format(
							JDIDebugModelMessages.JDIArrayValue_exception_while_setting_value_in_array,
							e.toString()), e);
		} catch (RuntimeException e) {
			targetRequestFailed(
					MessageFormat.format(
							JDIDebugModelMessages.JDIArrayValue_exception_while_setting_value_in_array,
							e.toString()), e);
		}
	}

	/**
	 * Returns the underlying array reference for this array.
	 *
	 * @return underlying array reference
	 */
	@Override
	protected ArrayReference getArrayReference() {
		return (ArrayReference) getUnderlyingValue();
	}

	/**
	 * Returns the underlying value at the given index from the underlying array
	 * reference.
	 *
	 * @param index
	 *            the index at which to retrieve a value
	 * @return value
	 * @exception DebugException
	 *                if this method fails. Reasons include:
	 *                <ul>
	 *                <li>Failure communicating with the VM. The
	 *                DebugException's status code contains the underlying
	 *                exception responsible for the failure.</li>
	 *                </ul>
	 */
	protected Value getUnderlyingValue(int index) throws DebugException {
		try {
			return getArrayReference().getValue(index);
		} catch (IndexOutOfBoundsException e) {
			throw e;
		} catch (RuntimeException e) {
			targetRequestFailed(
					MessageFormat.format(
							JDIDebugModelMessages.JDIArrayValue_exception_while_retrieving_value_from_array,
							e.toString()), e);
		}
		// execution will not reach this line as
		// an exception will be thrown
		return null;
	}

	/**
	 * Returns the underlying values from the underlying array reference.
	 *
	 * @return list of values
	 * @exception DebugException
	 *                if this method fails. Reasons include:
	 *                <ul>
	 *                <li>Failure communicating with the VM. The
	 *                DebugException's status code contains the underlying
	 *                exception responsible for the failure.</li>
	 *                </ul>
	 */
	protected List<Value> getUnderlyingValues() throws DebugException {
		try {
			return getArrayReference().getValues();
		} catch (IndexOutOfBoundsException e) {
			return Collections.EMPTY_LIST;
		} catch (RuntimeException e) {
			targetRequestFailed(
					MessageFormat.format(
							JDIDebugModelMessages.JDIArrayValue_exception_while_retrieving_values_from_array,
							e.toString()), e);
		}
		// execution will not reach this line as
		// an exception will be thrown
		return null;
	}

	/*
	 * (non-Javadoc)
	 *
	 * @see org.eclipse.debug.core.model.IIndexedValue#getSize()
	 */
	@Override
	public int getSize() throws DebugException {
		return getLength();
	}

	/*
	 * (non-Javadoc)
	 *
	 * @see org.eclipse.debug.core.model.IIndexedValue#getVariable(int)
	 */
	@Override
	public IVariable getVariable(int offset) throws DebugException {
		if (offset >= getLength()) {
			requestFailed(JDIDebugModelMessages.JDIArrayValue_6, new IndexOutOfBoundsException(Integer.toString(offset)));
		}
		return new JDIArrayEntryVariable(getJavaDebugTarget(),
				getArrayReference(), offset, fLogicalParent);
	}

	/*
	 * (non-Javadoc)
	 *
	 * @see org.eclipse.debug.core.model.IIndexedValue#getVariables(int, int)
	 */
	@Override
	public IVariable[] getVariables(int offset, int length)
			throws DebugException {
		if (offset >= getLength()) {
			requestFailed(JDIDebugModelMessages.JDIArrayValue_6, new IndexOutOfBoundsException(Integer.toString(offset)));
		}
		if ((offset + length - 1) >= getLength()) {
			requestFailed(JDIDebugModelMessages.JDIArrayValue_8, new IndexOutOfBoundsException(Integer.toString(offset + length - 1)));
		}
		IVariable[] variables = new IVariable[length];
		int index = offset;
		for (int i = 0; i < length; i++) {
			variables[i] = new JDIArrayEntryVariable(getJavaDebugTarget(),
					getArrayReference(), index, fLogicalParent);
			index++;
		}
		return variables;
	}

	/*
	 * (non-Javadoc)
	 *
	 * @see org.eclipse.debug.core.model.IIndexedValue#getInitialOffset()
	 */
	@Override
	public int getInitialOffset() {
		return 0;
	}

	/*
	 * (non-Javadoc)
	 *
	 * @see org.eclipse.debug.core.model.IValue#hasVariables()
	 */
	@Override
	public boolean hasVariables() throws DebugException {
		return getLength() > 0;
	}

	/*
	 * (non-Javadoc)
	 *
	 * @see org.eclipse.jdt.debug.core.IJavaArray#setValues(int, int,
	 * org.eclipse.jdt.debug.core.IJavaValue[], int)
	 */
	@Override
	public void setValues(int offset, int length, IJavaValue[] values,
			int startOffset) throws DebugException {
		try {
			List<Value> list = new ArrayList<>(values.length);
			for (IJavaValue value : values) {
				list.add(((JDIValue) value).getUnderlyingValue());
			}
			getArrayReference().setValues(offset, list, startOffset, length);
		} catch (IndexOutOfBoundsException e) {
			throw e;
		} catch (InvalidTypeException e) {
			targetRequestFailed(
					MessageFormat.format(
							JDIDebugModelMessages.JDIArrayValue_exception_while_setting_value_in_array,
							e.toString()), e);
		} catch (ClassNotLoadedException e) {
			targetRequestFailed(
					MessageFormat.format(
							JDIDebugModelMessages.JDIArrayValue_exception_while_setting_value_in_array,
							e.toString()), e);
		} catch (RuntimeException e) {
			targetRequestFailed(
					MessageFormat.format(
							JDIDebugModelMessages.JDIArrayValue_exception_while_setting_value_in_array,
							e.toString()), e);
		}

	}

	/*
	 * (non-Javadoc)
	 *
	 * @see
	 * org.eclipse.jdt.debug.core.IJavaArray#setValues(org.eclipse.jdt.debug
	 * .core.IJavaValue[])
	 */
	@Override
	public void setValues(IJavaValue[] values) throws DebugException {
		int length = Math.min(values.length, getSize());
		setValues(0, length, values, 0);
	}

}