////////////////////////////////////////////////////////////////////////////////
//
//  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.
//
////////////////////////////////////////////////////////////////////////////////
package spark.components {
    import flash.display.Sprite;
    import flash.events.EventPhase;
    import flash.events.KeyboardEvent;
    import flash.events.MouseEvent;
    import flash.ui.Keyboard;

    import mx.core.FlexGlobals;
    import mx.core.IFlexDisplayObject;
    import mx.core.IFlexModule;
    import mx.core.IFlexModuleFactory;
    import mx.core.UIComponent;
    import mx.events.CloseEvent;
    import mx.events.FlexEvent;
    import mx.managers.IActiveWindowManager;
    import mx.managers.ISystemManager;
    import mx.managers.PopUpManager;
    import mx.resources.ResourceManager;

    import spark.components.supportClasses.TextBase;

    //--------------------------------------
    //  Styles
    //--------------------------------------

    /**
     *  Name of the CSS style declaration that specifies
     *  styles for the Alert buttons.
     *
     *  @default "alertButtonStyle"
     *
     *  @langversion 3.0
     *  @playerversion Flash 10.1
     *  @playerversion AIR 2.5
     *  @productversion Flex 4.5
     */
    [Style(name="buttonStyleName", type="String", inherit="no")]

    /**
     *  Name of the CSS style declaration that specifies
     *  styles for the Alert message text.
     *
     *  <p>You only set this style by using a type selector, which sets the style
     *  for all Alert controls in your application.
     *  If you set it on a specific instance of the Alert control, it can cause the control to
     *  size itself incorrectly.</p>
     *
     *  @default undefined
     *
     *  @langversion 3.0
     *  @playerversion Flash 10.1
     *  @playerversion AIR 2.5
     *  @productversion Flex 4.5
     */
    [Style(name="messageStyleName", type="String", inherit="no")]

    //--------------------------------------
    //  Other metadata
    //--------------------------------------

    [RequiresDataBinding(true)]

    [ResourceBundle("alert")]

    /**
     *  The Alert control is a pop-up dialog box that can contain a message,
     *  a title, buttons (any combination of OK, Cancel, Yes, and No) and an icon.
     *  The Alert control is modal, which means it will retain focus until the user closes it.
     *
     *  <p>Import the spark.components.spark.components.alert.Alert class into your application,
     *  and then call the static <code>show()</code> method in ActionScript to display
     *  an Alert control. You cannot create an Alert control in MXML.</p>
     *
     *  <p>The Alert control closes when you select a button in the control,
     *  or press the Escape key.</p>
     *
     *
     *
     *  @langversion 3.0
     *  @playerversion Flash 10.1
     *  @playerversion AIR 2.5
     *  @productversion Flex 4.5
     */ /**
     * @author Bogdan Dinu (http://www.badu.ro)
     */ public class Alert extends Panel {
        [SkinPart(required="false")]
        public var messageDisplay:TextBase;

        [SkinPart(required="false")]
        public var buttonGroup:Group;

        [SkinPart(required="false")]
        public var iconGroup:Group;

        //----------------------------------
        //  buttonHeight
        //----------------------------------

        [Inspectable(category="Size")]

        /**
         *  Height of each Alert button, in pixels.
         *  All buttons must be the same height.
         *
         *  @default 24
         *
         *  @langversion 3.0
         *  @playerversion Flash 10.1
         *  @playerversion AIR 2.5
         *  @productversion Flex 4.5
         */ public static var buttonHeight:Number = 24;

        //----------------------------------
        //  buttonWidth
        //----------------------------------

        [Inspectable(category="Size")]

        /**
         *  Width of each Alert button, in pixels.
         *  All buttons must be the same width.
         *
         *  @default 65
         *
         *  @langversion 3.0
         *  @playerversion Flash 10.1
         *  @playerversion AIR 2.5
         *  @productversion Flex 4.5
         */ public static var buttonWidth:Number = 65;

        /**
         *  Value that enables a Yes button on the Alert control when passed
         *  as the <code>flags</code> parameter of the <code>show()</code> method.
         *  You can use the | operator to combine this bitflag
         *  with the <code>OK</code>, <code>CANCEL</code>,
         *  <code>NO</code>, and <code>NONMODAL</code> flags.
         *
         *  @langversion 3.0
         *  @playerversion Flash 9
         *  @playerversion AIR 1.1
         *  @productversion Flex 3
         */
        public static const YES:uint = 0x0001;

        /**
         *  Value that enables a No button on the Alert control when passed
         *  as the <code>flags</code> parameter of the <code>show()</code> method.
         *  You can use the | operator to combine this bitflag
         *  with the <code>OK</code>, <code>CANCEL</code>,
         *  <code>YES</code>, and <code>NONMODAL</code> flags.
         *
         *  @langversion 3.0
         *  @playerversion Flash 9
         *  @playerversion AIR 1.1
         *  @productversion Flex 3
         */
        public static const NO:uint = 0x0002;

        /**
         *  Value that enables an OK button on the Alert control when passed
         *  as the <code>flags</code> parameter of the <code>show()</code> method.
         *  You can use the | operator to combine this bitflag
         *  with the <code>CANCEL</code>, <code>YES</code>,
         *  <code>NO</code>, and <code>NONMODAL</code> flags.
         *
         *  @langversion 3.0
         *  @playerversion Flash 9
         *  @playerversion AIR 1.1
         *  @productversion Flex 3
         */
        public static const OK:uint = 0x0004;

        /**
         *  Value that enables a Cancel button on the Alert control when passed
         *  as the <code>flags</code> parameter of the <code>show()</code> method.
         *  You can use the | operator to combine this bitflag
         *  with the <code>OK</code>, <code>YES</code>,
         *  <code>NO</code>, and <code>NONMODAL</code> flags.
         *
         *  @langversion 3.0
         *  @playerversion Flash 9
         *  @playerversion AIR 1.1
         *  @productversion Flex 3
         */
        public static const CANCEL:uint = 0x0008;

        /**
         *  Value that makes an Alert nonmodal when passed as the
         *  <code>flags</code> parameter of the <code>show()</code> method.
         *  You can use the | operator to combine this bitflag
         *  with the <code>OK</code>, <code>CANCEL</code>,
         *  <code>YES</code>, and <code>NO</code> flags.
         *
         *  @langversion 3.0
         *  @playerversion Flash 9
         *  @playerversion AIR 1.1
         *  @productversion Flex 3
         */
        public static const NONMODAL:uint = 0x8000;

        /**
         *  The label for the Yes button.
         *
         *  <p>If you use a different label, you may need to adjust the
         *  <code>buttonWidth</code> property to fully display the label.</p>
         *
         *  The English resource bundle sets this property to "YES".
         *
         *  @langversion 3.0
         *  @playerversion Flash 10.1
         *  @playerversion AIR 2.5
         *  @productversion Flex 4.5
         */
        private static var _yesLabel:String;
        private static var _yesLabelOverride:String;

        [Inspectable(category="General")]
        public static function get YES_LABEL():String {
            if (!_yesLabel) {
                _yesLabel = ResourceManager.getInstance().getString('alert', 'YesLabel');
            }
            return _yesLabelOverride ? _yesLabelOverride : _yesLabel;
        }

        public static function set YES_LABEL(value:String):void {
            _yesLabelOverride = value;
        }

        /**
         *  The label for the No button.
         *
         *  <p>If you use a different label, you may need to adjust the
         *  <code>buttonWidth</code> property to fully display it.</p>
         *
         *  The English resource bundle sets this property to "NO".
         *
         *  @langversion 3.0
         *  @playerversion Flash 10.1
         *  @playerversion AIR 2.5
         *  @productversion Flex 4.5
         */
        private static var _noLabel:String;
        private static var _noLabelOverride:String;

        [Inspectable(category="General")]
        public static function get NO_LABEL():String {
            if (!_noLabel) {
                _noLabel = ResourceManager.getInstance().getString('alert', 'NoLabel');
            }
            return _noLabelOverride ? _noLabelOverride : _noLabel;
        }

        public static function set NO_LABEL(value:String):void {
            _noLabelOverride = value;
        }

        /**
         *  The label for the OK button.
         *
         *  <p>If you use a different label, you may need to adjust the
         *  <code>buttonWidth</code> property to fully display the label.</p>
         *
         *  The English resource bundle sets this property to "OK".
         *
         *  @langversion 3.0
         *  @playerversion Flash 10.1
         *  @playerversion AIR 2.5
         *  @productversion Flex 4.5
         */
        private static var _okLabel:String;
        private static var _okLabelOverride:String;

        [Inspectable(category="General")]
        public static function get OK_LABEL():String {
            if (!_okLabel) {
                _okLabel = ResourceManager.getInstance().getString('alert', 'OkLabel');
            }
            return _okLabelOverride ? _okLabelOverride : _okLabel;
        }

        public static function set OK_LABEL(value:String):void {
            _okLabelOverride = value;
        }

        /**
         *  The label for the Cancel button.
         *
         *  <p>If you use a different label, you may need to adjust the
         *  <code>buttonWidth</code> property to fully display it.</p>
         *
         *  The English resource bundle sets this property to "CANCEL".
         *
         *  @langversion 3.0
         *  @playerversion Flash 10.1
         *  @playerversion AIR 2.5
         *  @productversion Flex 4.5
         */
        private static var _cancelLabel:String;
        private static var _cancelLabelOverride:String;

        [Inspectable(category="General")]
        public static function get CANCEL_LABEL():String {
            if (!_cancelLabel) {
                _cancelLabel = ResourceManager.getInstance().getString('alert', 'CancelLabel');
            }
            return _cancelLabelOverride ? _cancelLabelOverride : _cancelLabel;
        }

        public static function set CANCEL_LABEL(value:String):void {
            _cancelLabelOverride = value;
        }

        private var _message:String;
        private var _defaultButtonFlag:uint = 0;
        private var _buttons:Vector.<Button>;

        //--------------------------------------------------------------------------
        //
        //  Class methods
        //
        //--------------------------------------------------------------------------

        /**
         *  Static method that pops up the Alert control. The Alert control
         *  closes when you select a button in the control, or press the Escape key.
         *
         *  @param message Text string that appears in the Alert control.
         *  This text is centered in the alert dialog box.
         *
         *  @param title Text string that appears in the title bar.
         *  This text is left justified.
         *
         *  @param flags Which buttons to place in the Alert control.
         *  Valid values are <code>Alert.OK</code>, <code>Alert.CANCEL</code>,
         *  <code>Alert.YES</code>, and <code>Alert.NO</code>.
         *  The default value is <code>Alert.OK</code>.
         *  Use the bitwise OR operator to display more than one button.
         *  For example, passing <code>(Alert.YES | Alert.NO)</code>
         *  displays Yes and No buttons.
         *  Regardless of the order that you specify buttons,
         *  they always appear in the following order from left to right:
         *  OK, Yes, No, Cancel.
         *
         *  @param parent Object upon which the Alert control centers itself.
         *
         *  @param closeHandler Event handler that is called when any button
         *  on the Alert control is pressed.
         *  The event object passed to this handler is an instance of CloseEvent;
         *  the <code>detail</code> property of this object contains the value
         *  <code>Alert.OK</code>, <code>Alert.CANCEL</code>,
         *  <code>Alert.YES</code>, or <code>Alert.NO</code>.
         *
         *  @param iconClass Class of the icon that is placed to the left
         *  of the text in the Alert control.
         *
         *  @param defaultButtonFlag A bitflag that specifies the default button.
         *  You can specify one and only one of
         *  <code>Alert.OK</code>, <code>Alert.CANCEL</code>,
         *  <code>Alert.YES</code>, or <code>Alert.NO</code>.
         *  The default value is <code>Alert.OK</code>.
         *  Pressing the Enter key triggers the default button
         *  just as if you clicked it. Pressing Escape triggers the Cancel
         *  or No button just as if you selected it.
         *
         *  @param moduleFactory The moduleFactory where this Alert should look for
         *  its embedded fonts and style manager.
         *
         *  @return A reference to the Alert control.
         *
         *  @see mx.events.CloseEvent
         *
         *  @langversion 3.0
         *  @playerversion Flash 10.1
         *  @playerversion AIR 2.5
         *  @productversion Flex 4.5
         */
        public static function show(message:String = "", title:String = "", flags:uint = OK, parent:Sprite = null, closeHandler:Function = null,
                                    iconClass:Class = null, defaultButtonFlag:uint = 0 /* Alert.OK */, moduleFactory:IFlexModuleFactory = null):Alert {

            var modal:Boolean = (flags & Alert.NONMODAL) ? false : true;

            if (!parent) {
                var sm:ISystemManager = ISystemManager(FlexGlobals.topLevelApplication.systemManager);
                // no types so no dependencies
                var mp:Object = sm.getImplementation("mx.managers.IMarshallPlanSystemManager");
                if (mp && mp.useSWFBridge()) {
                    parent = Sprite(sm.getSandboxRoot());
                } else {
                    parent = Sprite(FlexGlobals.topLevelApplication);
                }
            }

            var alert:Alert = new Alert();
            alert.buttonsFlag = flags;
            alert.defaultButtonFlag = defaultButtonFlag;

            alert.message = message;
            alert.title = title;
            alert.iconClass = iconClass;

            if (closeHandler != null) {
                alert.addEventListener(CloseEvent.CLOSE, closeHandler);
            }

            // Setting a module factory allows the correct embedded font to be found.
            if (moduleFactory) {
                alert.moduleFactory = moduleFactory;
            } else if (parent is IFlexModule) {
                alert.moduleFactory = IFlexModule(parent).moduleFactory;
            } else {
                if (parent is IFlexModuleFactory) {
                    alert.moduleFactory = IFlexModuleFactory(parent);
                } else {
                    alert.moduleFactory = FlexGlobals.topLevelApplication.moduleFactory;
                }

                // also set document if parent isn't a UIComponent
                if (!parent is UIComponent) {
                    alert.document = FlexGlobals.topLevelApplication.document;
                }
            }

            alert.addEventListener(FlexEvent.CREATION_COMPLETE, staticCreationComplete);
            PopUpManager.addPopUp(alert, parent, modal);

            return alert;
        }

        //--------------------------------------------------------------------------
        //
        //  Class event handlers
        //
        //--------------------------------------------------------------------------

        /**
         *  @private
         */
        private static function staticCreationComplete(event:FlexEvent):void {
            if (event.target is IFlexDisplayObject && event.eventPhase == EventPhase.AT_TARGET) {
                var alert:Alert = Alert(event.target);
                alert.removeEventListener(FlexEvent.CREATION_COMPLETE, staticCreationComplete);
                alert.setActualSize(alert.getExplicitOrMeasuredWidth(), alert.getExplicitOrMeasuredHeight());
                PopUpManager.centerPopUp(alert);
            }
        }

        //--------------------------------------------------------------------------
        //
        //  Constructor
        //
        //--------------------------------------------------------------------------

        /**
         *  Constructor.
         *
         *  @langversion 3.0
         *  @playerversion Flash 10.1
         *  @playerversion AIR 2.5
         *  @productversion Flex 4.5
         */
        public function Alert() {
            super();
            title = "";
            message = "";
        }

        //--------------------------------------------------------------------------
        //
        //  Overridden properties
        //
        //--------------------------------------------------------------------------

        //--------------------------------------------------------------------------
        //
        //  Properties
        //
        //--------------------------------------------------------------------------

        //----------------------------------
        //  buttonFlags
        //----------------------------------

        private var _buttonsFlag:uint;

        /**
         *  A bitmask that contains <code>Alert.OK</code>, <code>Alert.CANCEL</code>,
         *  <code>Alert.YES</code>, and/or <code>Alert.NO</code> indicating
         *  the buttons available in the Alert control.
         *
         *  @default Alert.OK
         *
         *  @langversion 3.0
         *  @playerversion Flash 10.1
         *  @playerversion AIR 2.5
         *  @productversion Flex 4.5
         */
        public function get buttonsFlag():uint {
            return _buttonsFlag;
        }

        public function set buttonsFlag(flags:uint):void {
            _buttonsFlag = flags;
        }

        //----------------------------------
        //  defaultButtonFlag
        //----------------------------------

        [Inspectable(category="General")]

        /**
         *  A bitflag that contains either <code>Alert.OK</code>,
         *  <code>Alert.CANCEL</code>, <code>Alert.YES</code>,
         *  or <code>Alert.NO</code> to specify the default button.
         *
         *  @default Alert.OK
         *
         *  @langversion 3.0
         *  @playerversion Flash 9
         *  @playerversion AIR 1.1
         *  @productversion Flex 3
         */ public function get defaultButtonFlag():int {
            return _defaultButtonFlag;
        }

        public function set defaultButtonFlag(value:int):void {
            _defaultButtonFlag = value;
        }

        //----------------------------------
        //  iconClass
        //----------------------------------
        private var _iconClass:Class;

        [Inspectable(category="Other")]

        /**
         *  The class of the icon to display.
         *  You typically embed an asset, such as a JPEG or GIF file,
         *  and then use the variable associated with the embedded asset
         *  to specify the value of this property.
         *
         *  @default null
         *
         *  @langversion 3.0
         *  @playerversion Flash 9
         *  @playerversion AIR 1.1
         *  @productversion Flex 3
         */ public function get iconClass():Class {
            return _iconClass;
        }

        public function set iconClass(value:Class):void {
            _iconClass = value;
        }

        //----------------------------------
        //  text
        //----------------------------------

        [Inspectable(category="General")]

        /**
         *  The text to display in this alert dialog box.
         *
         *  @default ""
         *
         *  @langversion 3.0
         *  @playerversion Flash 9
         *  @playerversion AIR 1.1
         *  @productversion Flex 3
         */ public function get message():String {
            return _message;
        }

        public function set message(value:String):void {
            if (_message == value) {
                return;
            }
            _message = value;
            if (messageDisplay) {
                messageDisplay.text = _message;
            }
        }

        //--------------------------------------------------------------------------
        //
        //  Overridden methods
        //
        //--------------------------------------------------------------------------

        override public function styleChanged(styleProp:String):void {
            super.styleChanged(styleProp);
            var all:Boolean = ( !styleProp || styleProp == "styleName" );
            if (( all || styleProp == "buttonStyleName" ) && _buttons) {
                var buttonStyleName:String = getStyle("buttonStyleName");
                var n:int = _buttons.length;
                for (var i:int = 0; i < n; i++) {
                    _buttons[ i ].styleName = buttonStyleName;
                }
            }
            if (( all || styleProp == "messageStyleName" ) && messageDisplay) {
                messageDisplay.styleName = getStyle("messageStyleName");
            }
        }

        override protected function partAdded(partName:String, instance:Object):void {
            super.partAdded(partName, instance);
            if (partName == "buttonGroup") {
                createButtons(Group(instance));
            }
            if (partName == "messageDisplay") {
                messageDisplay.text = message;
                messageDisplay.styleName = getStyle("messageStyleName");
            }
            if (partName == "iconGroup") {
                createIcon(Group(instance));
            }
        }

        override protected function partRemoved(partName:String, instance:Object):void {
            super.partAdded(partName, instance);
            if (partName == "buttonGroup") {
                destroyButtons(Group(instance));
            }
        }

        override public function set initialized(value:Boolean):void {
            super.initialized = value;
            setButtonFocus();
        }

        //--------------------------------------------------------------------------
        //
        //  private methods
        //
        //--------------------------------------------------------------------------
        /**
         *  @private
         */
        private function createIcon(container:Group):void {
            if (!container || !_iconClass) {
                return;
            }
            var iconHolder:UIComponent = new UIComponent();
            iconHolder.addChild(new _iconClass());
            container.addElement(iconHolder);
        }

        /**
         *  @private
         */
        private function createButtons(container:Group):void {
            if (!container || !buttonsFlag) {
                return;
            }
            _buttons = new Vector.<Button>();

            var _buttonLabels:Array = [];
            if (Boolean(_buttonsFlag & YES)) {
                _buttonLabels.push(YES_LABEL);
            }
            if (Boolean(_buttonsFlag & NO)) {
                _buttonLabels.push(NO_LABEL);
            }
            if (Boolean(_buttonsFlag & OK)) {
                _buttonLabels.push(OK_LABEL);
            }
            if (Boolean(_buttonsFlag & CANCEL)) {
                _buttonLabels.push(CANCEL_LABEL);
            }
            if (!_buttonLabels.length) {
                _buttonLabels.push(OK_LABEL);
            }

            var buttonStyleName:String = getStyle("buttonStyleName");
            var button:Button;
            var numButtons:int = _buttonLabels.length;
            for (var i:int = 0; i < numButtons; i++) {
                button = new Button();
                if (buttonStyleName) {
                    button.styleName = buttonStyleName;
                }
                button.label = _buttonLabels[ i ];
                button.useHandCursor = true;
                button.mouseChildren = false;
                button.buttonMode = true;
                button.width = buttonWidth;
                button.height = buttonHeight;
                button.addEventListener(MouseEvent.CLICK, onButtonClick, false, 0, true);
                container.addElement(button);
                _buttons.push(button);
            }
            addEventListener(KeyboardEvent.KEY_DOWN, onKeyDown);
            setButtonFocus();
        }

        /**
         *  @private
         */
        private function destroyButtons(container:Group):void {
            removeEventListener(KeyboardEvent.KEY_DOWN, onKeyDown);
            var button:Button;
            var numButtons:int = _buttons.length;
            for (var i:int = 0; i < numButtons; i++) {
                button = _buttons[ i ];
                button.removeEventListener(MouseEvent.CLICK, onButtonClick, false);
                if (container) {
                    container.removeElement(button);
                }
            }
            _buttons = null;
        }

        /**
         *  @private
         */
        private static function identifyButton(target:Button):uint {
            var result:uint;
            switch (target.label) {
                case OK_LABEL:
                    result = OK;
                    break;
                case CANCEL_LABEL:
                    result = CANCEL;
                    break;
                case YES_LABEL:
                    result = YES;
                    break;
                case NO_LABEL:
                    result = NO;
                    break;
                default:
                    result = Number.MAX_VALUE;
                    break;
            }
            return result;
        }

        /**
         *  @private
         */
        private function onButtonClick(event:MouseEvent):void {
            removeAlert(identifyButton(Button(event.currentTarget)));
        }

        /**
         *  @private
         */
        private function removeAlert(index:int):void {
            visible = false;
            dispatchEvent(new CloseEvent(CloseEvent.CLOSE, false, false, index));
            PopUpManager.removePopUp(this);
            if (_buttons) {
                destroyButtons(buttonGroup);
            }
        }

        /**
         *  @private
         */
        private function setButtonFocus():void {
            if (!initialized) {
                return;
            }
            var sm:ISystemManager = systemManager;
            var awm:IActiveWindowManager = IActiveWindowManager(sm.getImplementation("mx.managers::IActiveWindowManager"));
            if (awm) {
                awm.activate(this);
            }
            if (_buttons) {
                if (_defaultButtonFlag >= 0 && _defaultButtonFlag < _buttons.length - 1) {
                    _buttons[ _defaultButtonFlag ].setFocus();
                    _buttons[ _defaultButtonFlag ].drawFocus(true);
                }
            }
        }

        /**
         * @private
         */
        private function onKeyDown(e:KeyboardEvent):void {
            if (e.charCode == Keyboard.ESCAPE) {
                removeAlert(identifyButton(_buttons[ _defaultButtonFlag ] as Button));
            }
        }
    }
}