/*
 *  Licensed to the Apache Software Foundation (ASF) under one or more
 *  contributor license agreements.  See the NOTICE file distributed with
 *  this work for additional information regarding copyright ownership.
 *  The ASF licenses this file to You 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.
 */
/**
 * @author Michael Danilov
 * @version $Revision$
 */
package java.awt.event;

import java.awt.Component;
import java.awt.Toolkit;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;

import org.apache.harmony.awt.internal.nls.Messages;

/**
 * This class is not supported in Android 1.0. It is merely provided to maintain
 * interface compatibility with desktop Java implementations.
 * 
 * @since Android 1.0
 */
public class KeyEvent extends InputEvent {

    private static final long serialVersionUID = -2352130953028126954L;

    public static final int KEY_FIRST = 400;

    public static final int KEY_LAST = 402;

    public static final int KEY_TYPED = 400;

    public static final int KEY_PRESSED = 401;

    public static final int KEY_RELEASED = 402;

    public static final int VK_ENTER = 10;

    public static final int VK_BACK_SPACE = 8;

    public static final int VK_TAB = 9;

    public static final int VK_CANCEL = 3;

    public static final int VK_CLEAR = 12;

    public static final int VK_SHIFT = 16;

    public static final int VK_CONTROL = 17;

    public static final int VK_ALT = 18;

    public static final int VK_PAUSE = 19;

    public static final int VK_CAPS_LOCK = 20;

    public static final int VK_ESCAPE = 27;

    public static final int VK_SPACE = 32;

    public static final int VK_PAGE_UP = 33;

    public static final int VK_PAGE_DOWN = 34;

    public static final int VK_END = 35;

    public static final int VK_HOME = 36;

    public static final int VK_LEFT = 37;

    public static final int VK_UP = 38;

    public static final int VK_RIGHT = 39;

    public static final int VK_DOWN = 40;

    public static final int VK_COMMA = 44;

    public static final int VK_MINUS = 45;

    public static final int VK_PERIOD = 46;

    public static final int VK_SLASH = 47;

    public static final int VK_0 = 48;

    public static final int VK_1 = 49;

    public static final int VK_2 = 50;

    public static final int VK_3 = 51;

    public static final int VK_4 = 52;

    public static final int VK_5 = 53;

    public static final int VK_6 = 54;

    public static final int VK_7 = 55;

    public static final int VK_8 = 56;

    public static final int VK_9 = 57;

    public static final int VK_SEMICOLON = 59;

    public static final int VK_EQUALS = 61;

    public static final int VK_A = 65;

    public static final int VK_B = 66;

    public static final int VK_C = 67;

    public static final int VK_D = 68;

    public static final int VK_E = 69;

    public static final int VK_F = 70;

    public static final int VK_G = 71;

    public static final int VK_H = 72;

    public static final int VK_I = 73;

    public static final int VK_J = 74;

    public static final int VK_K = 75;

    public static final int VK_L = 76;

    public static final int VK_M = 77;

    public static final int VK_N = 78;

    public static final int VK_O = 79;

    public static final int VK_P = 80;

    public static final int VK_Q = 81;

    public static final int VK_R = 82;

    public static final int VK_S = 83;

    public static final int VK_T = 84;

    public static final int VK_U = 85;

    public static final int VK_V = 86;

    public static final int VK_W = 87;

    public static final int VK_X = 88;

    public static final int VK_Y = 89;

    public static final int VK_Z = 90;

    public static final int VK_OPEN_BRACKET = 91;

    public static final int VK_BACK_SLASH = 92;

    public static final int VK_CLOSE_BRACKET = 93;

    public static final int VK_NUMPAD0 = 96;

    public static final int VK_NUMPAD1 = 97;

    public static final int VK_NUMPAD2 = 98;

    public static final int VK_NUMPAD3 = 99;

    public static final int VK_NUMPAD4 = 100;

    public static final int VK_NUMPAD5 = 101;

    public static final int VK_NUMPAD6 = 102;

    public static final int VK_NUMPAD7 = 103;

    public static final int VK_NUMPAD8 = 104;

    public static final int VK_NUMPAD9 = 105;

    public static final int VK_MULTIPLY = 106;

    public static final int VK_ADD = 107;

    public static final int VK_SEPARATER = 108;

    public static final int VK_SEPARATOR = 108;

    public static final int VK_SUBTRACT = 109;

    public static final int VK_DECIMAL = 110;

    public static final int VK_DIVIDE = 111;

    public static final int VK_DELETE = 127;

    public static final int VK_NUM_LOCK = 144;

    public static final int VK_SCROLL_LOCK = 145;

    public static final int VK_F1 = 112;

    public static final int VK_F2 = 113;

    public static final int VK_F3 = 114;

    public static final int VK_F4 = 115;

    public static final int VK_F5 = 116;

    public static final int VK_F6 = 117;

    public static final int VK_F7 = 118;

    public static final int VK_F8 = 119;

    public static final int VK_F9 = 120;

    public static final int VK_F10 = 121;

    public static final int VK_F11 = 122;

    public static final int VK_F12 = 123;

    public static final int VK_F13 = 61440;

    public static final int VK_F14 = 61441;

    public static final int VK_F15 = 61442;

    public static final int VK_F16 = 61443;

    public static final int VK_F17 = 61444;

    public static final int VK_F18 = 61445;

    public static final int VK_F19 = 61446;

    public static final int VK_F20 = 61447;

    public static final int VK_F21 = 61448;

    public static final int VK_F22 = 61449;

    public static final int VK_F23 = 61450;

    public static final int VK_F24 = 61451;

    public static final int VK_PRINTSCREEN = 154;

    public static final int VK_INSERT = 155;

    public static final int VK_HELP = 156;

    public static final int VK_META = 157;

    public static final int VK_BACK_QUOTE = 192;

    public static final int VK_QUOTE = 222;

    public static final int VK_KP_UP = 224;

    public static final int VK_KP_DOWN = 225;

    public static final int VK_KP_LEFT = 226;

    public static final int VK_KP_RIGHT = 227;

    public static final int VK_DEAD_GRAVE = 128;

    public static final int VK_DEAD_ACUTE = 129;

    public static final int VK_DEAD_CIRCUMFLEX = 130;

    public static final int VK_DEAD_TILDE = 131;

    public static final int VK_DEAD_MACRON = 132;

    public static final int VK_DEAD_BREVE = 133;

    public static final int VK_DEAD_ABOVEDOT = 134;

    public static final int VK_DEAD_DIAERESIS = 135;

    public static final int VK_DEAD_ABOVERING = 136;

    public static final int VK_DEAD_DOUBLEACUTE = 137;

    public static final int VK_DEAD_CARON = 138;

    public static final int VK_DEAD_CEDILLA = 139;

    public static final int VK_DEAD_OGONEK = 140;

    public static final int VK_DEAD_IOTA = 141;

    public static final int VK_DEAD_VOICED_SOUND = 142;

    public static final int VK_DEAD_SEMIVOICED_SOUND = 143;

    public static final int VK_AMPERSAND = 150;

    public static final int VK_ASTERISK = 151;

    public static final int VK_QUOTEDBL = 152;

    public static final int VK_LESS = 153;

    public static final int VK_GREATER = 160;

    public static final int VK_BRACELEFT = 161;

    public static final int VK_BRACERIGHT = 162;

    public static final int VK_AT = 512;

    public static final int VK_COLON = 513;

    public static final int VK_CIRCUMFLEX = 514;

    public static final int VK_DOLLAR = 515;

    public static final int VK_EURO_SIGN = 516;

    public static final int VK_EXCLAMATION_MARK = 517;

    public static final int VK_INVERTED_EXCLAMATION_MARK = 518;

    public static final int VK_LEFT_PARENTHESIS = 519;

    public static final int VK_NUMBER_SIGN = 520;

    public static final int VK_PLUS = 521;

    public static final int VK_RIGHT_PARENTHESIS = 522;

    public static final int VK_UNDERSCORE = 523;

    public static final int VK_FINAL = 24;

    public static final int VK_WINDOWS = 524; 

    public static final int VK_CONTEXT_MENU = 525;

    public static final int VK_CONVERT = 28;

    public static final int VK_NONCONVERT = 29;

    public static final int VK_ACCEPT = 30;

    public static final int VK_MODECHANGE = 31;

    public static final int VK_KANA = 21;

    public static final int VK_KANJI = 25;

    public static final int VK_ALPHANUMERIC = 240;

    public static final int VK_KATAKANA = 241;

    public static final int VK_HIRAGANA = 242;

    public static final int VK_FULL_WIDTH = 243;

    public static final int VK_HALF_WIDTH = 244;

    public static final int VK_ROMAN_CHARACTERS = 245;

    public static final int VK_ALL_CANDIDATES = 256;

    public static final int VK_PREVIOUS_CANDIDATE = 257;

    public static final int VK_CODE_INPUT = 258;

    public static final int VK_JAPANESE_KATAKANA = 259;

    public static final int VK_JAPANESE_HIRAGANA = 260;

    public static final int VK_JAPANESE_ROMAN = 261;

    public static final int VK_KANA_LOCK = 262;

    public static final int VK_INPUT_METHOD_ON_OFF = 263;

    public static final int VK_CUT = 65489;

    public static final int VK_COPY = 65485;

    public static final int VK_PASTE = 65487;

    public static final int VK_UNDO = 65483;

    public static final int VK_AGAIN = 65481;

    public static final int VK_FIND = 65488;

    public static final int VK_PROPS = 65482;

    public static final int VK_STOP = 65480;

    public static final int VK_COMPOSE = 65312;

    public static final int VK_ALT_GRAPH = 65406;

    public static final int VK_BEGIN = 65368;

    public static final int VK_UNDEFINED = 0;

    public static final char CHAR_UNDEFINED = (char)(-1);

    public static final int KEY_LOCATION_UNKNOWN = 0;

    public static final int KEY_LOCATION_STANDARD = 1;

    public static final int KEY_LOCATION_LEFT = 2;

    public static final int KEY_LOCATION_RIGHT = 3;

    public static final int KEY_LOCATION_NUMPAD = 4;

    private int keyCode;
    private char keyChar;
    private int keyLocation;

    public static String getKeyModifiersText(int modifiers) {
        return getKeyModifiersExText(extractExFlags(modifiers));
    }

    static String getKeyModifiersExText(int modifiersEx) {
        String text = ""; //$NON-NLS-1$

        if ((modifiersEx & InputEvent.META_DOWN_MASK) != 0) {
            text += Toolkit.getProperty("AWT.meta", "Meta"); //$NON-NLS-1$ //$NON-NLS-2$
        }
        if ((modifiersEx & InputEvent.CTRL_DOWN_MASK) != 0) {
            text += ((text.length() > 0) ? "+" : "") + //$NON-NLS-1$ //$NON-NLS-2$
                    Toolkit.getProperty("AWT.control", "Ctrl"); //$NON-NLS-1$ //$NON-NLS-2$
        }
        if ((modifiersEx & InputEvent.ALT_DOWN_MASK) != 0) {
            text += ((text.length() > 0) ? "+" : "") + //$NON-NLS-1$ //$NON-NLS-2$
                    Toolkit.getProperty("AWT.alt", "Alt"); //$NON-NLS-1$ //$NON-NLS-2$
        }
        if ((modifiersEx & InputEvent.SHIFT_DOWN_MASK) != 0) {
            text += ((text.length() > 0) ? "+" : "") + //$NON-NLS-1$ //$NON-NLS-2$
                    Toolkit.getProperty("AWT.shift", "Shift"); //$NON-NLS-1$ //$NON-NLS-2$
        }
        if ((modifiersEx & InputEvent.ALT_GRAPH_DOWN_MASK) != 0) {
            text += ((text.length() > 0) ? "+" : "") + //$NON-NLS-1$ //$NON-NLS-2$
                    Toolkit.getProperty("AWT.altGraph", "Alt Graph"); //$NON-NLS-1$ //$NON-NLS-2$
        }

        return text;
    }

    public static String getKeyText(int keyCode) {
        String[] rawName = getPublicStaticFinalIntFieldName(keyCode); //$NON-NLS-1$

        if ((rawName == null) || (rawName.length == 0)) {
            return ("Unknown keyCode: " + (keyCode >= 0 ? "0x" : "-0x") + //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
                    Integer.toHexString(Math.abs(keyCode)));
        }

        String propertyName = getPropertyName(rawName);
        String defaultName = getDefaultName(rawName);

        return Toolkit.getProperty(propertyName, defaultName);
    }

    private static String getDefaultName(String[] rawName) {
        String name = ""; //$NON-NLS-1$

        for (int i = 0; true; i++) {
            String part = rawName[i];

            name += new String(new char[] {part.charAt(0)}).toUpperCase() +
                    part.substring(1).toLowerCase();

            if (i == (rawName.length - 1)) {
                break;
            }
            name += " "; //$NON-NLS-1$
        }

        return name;
    }

    private static String getPropertyName(String[] rawName) {
        String name = rawName[0].toLowerCase();

        for (int i = 1; i < rawName.length; i++) {
            String part = rawName[i];

            name += new String(new char[] {part.charAt(0)}).toUpperCase() +
                    part.substring(1).toLowerCase();
        }

        return ("AWT." + name); //$NON-NLS-1$
    }

    private static String[] getPublicStaticFinalIntFieldName(int value) {
        Field[] allFields = KeyEvent.class.getDeclaredFields();

        try {
            for (Field field : allFields) {
                Class<?> ssalc = field.getType();
                int modifiers = field.getModifiers();

                if (ssalc.isPrimitive() && ssalc.getName().equals("int") && //$NON-NLS-1$
                        Modifier.isFinal(modifiers) && Modifier.isPublic(modifiers) &&
                        Modifier.isStatic(modifiers))
                {
                    if (field.getInt(null) == value){
                        final String name = field.getName();
                        final int prefixLength = name.indexOf("_") + 1;
                        return name.substring(prefixLength).split("_"); //$NON-NLS-1$
                    }
                }
            }
        } catch (Exception e) {
            throw new RuntimeException(e);
        }

        return null;
    }

    @Deprecated
    public KeyEvent(Component src, int id,
                    long when, int modifiers,
                    int keyCode) {
        this(src, id, when, modifiers, keyCode,
                (keyCode > (2 << 7) - 1) ? CHAR_UNDEFINED : (char) keyCode);
    }

    public KeyEvent(Component src, int id,
                    long when, int modifiers,
                    int keyCode, char keyChar) {
        this(src, id, when, modifiers, keyCode, keyChar, KEY_LOCATION_UNKNOWN);
    }

    public KeyEvent(Component src, int id,
                    long when, int modifiers,
                    int keyCode, char keyChar,
                    int keyLocation) {
        super(src, id, when, modifiers);

        if (id == KEY_TYPED) {
            if (keyCode != VK_UNDEFINED) {
                // awt.191=Invalid keyCode for KEY_TYPED event, must be VK_UNDEFINED
                throw new IllegalArgumentException(Messages.getString("awt.191")); //$NON-NLS-1$
            }
            if (keyChar == CHAR_UNDEFINED) {
                // awt.192=Invalid keyChar for KEY_TYPED event, can't be CHAR_UNDEFINED
                throw new IllegalArgumentException(Messages.getString("awt.192")); //$NON-NLS-1$
            }
        }
        
        if ((keyLocation < KEY_LOCATION_UNKNOWN)
                || (keyLocation > KEY_LOCATION_NUMPAD)) {
            // awt.297=Invalid keyLocation
            throw new IllegalArgumentException(Messages.getString("awt.297")); //$NON-NLS-1$
        }

        this.keyChar = keyChar;
        this.keyLocation = keyLocation;
        this.keyCode = keyCode;
    }

    public int getKeyCode() {
        return keyCode;
    }

    public void setKeyCode(int keyCode) {
        this.keyCode = keyCode;
    }

    public char getKeyChar() {
        return keyChar;
    }

    public void setKeyChar(char keyChar) {
        this.keyChar = keyChar;
    }

    public int getKeyLocation() {
        return keyLocation;
    }

    @Override
    @Deprecated
    public void setModifiers(int modifiers) {
        super.setModifiers(modifiers);
    }

    public boolean isActionKey() {
        return ((keyChar == CHAR_UNDEFINED) && (keyCode != VK_UNDEFINED) &&
                !((keyCode == VK_ALT) || (keyCode == VK_ALT_GRAPH) ||
                    (keyCode == VK_CONTROL) || (keyCode == VK_META) || (keyCode == VK_SHIFT)));
    }

    @Override
    public String paramString() {
        /*
         * The format is based on 1.5 release behavior
         * which can be revealed by the following code:
         *
         * KeyEvent e = new KeyEvent(new Component() {}, 
         *       KeyEvent.KEY_PRESSED, 0, 
         *       KeyEvent.CTRL_DOWN_MASK|KeyEvent.SHIFT_DOWN_MASK, 
         *       KeyEvent.VK_A, 'A', KeyEvent.KEY_LOCATION_STANDARD);
         * System.out.println(e);
         */

        String idString = null;
        String locString = null;
        String paramString = null;
        String keyCharString = (keyChar == '\n') ?
                keyCharString = getKeyText(VK_ENTER) : "'" + keyChar + "'"; //$NON-NLS-1$ //$NON-NLS-2$

        switch (id) {
        case KEY_PRESSED:
            idString = "KEY_PRESSED"; //$NON-NLS-1$
            break;
        case KEY_RELEASED:
            idString = "KEY_RELEASED"; //$NON-NLS-1$
            break;
        case KEY_TYPED:
            idString = "KEY_TYPED"; //$NON-NLS-1$
            break;
        default:
            idString = "unknown type"; //$NON-NLS-1$
        }

        switch(keyLocation){
        case KEY_LOCATION_STANDARD:
            locString = "KEY_LOCATION_STANDARD"; //$NON-NLS-1$
            break;
        case KEY_LOCATION_LEFT:
            locString = "KEY_LOCATION_LEFT"; //$NON-NLS-1$
            break;
        case KEY_LOCATION_RIGHT:
            locString = "KEY_LOCATION_RIGHT"; //$NON-NLS-1$
            break;
        case KEY_LOCATION_NUMPAD:
            locString = "KEY_LOCATION_NUMPAD"; //$NON-NLS-1$
            break;
        case KEY_LOCATION_UNKNOWN:
            locString = "KEY_LOCATION_UNKNOWN"; //$NON-NLS-1$
            break;
        default:
            locString = "unknown type"; //$NON-NLS-1$
        }

        paramString = idString + ",keyCode=" + keyCode; //$NON-NLS-1$
        if (isActionKey()) {
            paramString += "," + getKeyText(keyCode); //$NON-NLS-1$
        } else {
            paramString += ",keyChar=" + keyCharString; //$NON-NLS-1$
        }
        if (getModifiersEx() > 0) {
            paramString += ",modifiers=" + getModifiersExText(getModifiersEx()) + //$NON-NLS-1$
                    ",extModifiers=" + getModifiersExText(getModifiersEx()); //$NON-NLS-1$
        }
        paramString += ",keyLocation=" + locString; //$NON-NLS-1$

        return paramString;
    }

}