//------------------------------------------------------------------------------
// <copyright file="RadioButtonList.cs" company="Microsoft">
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// </copyright>
//------------------------------------------------------------------------------

namespace System.Web.UI.WebControls {

    using System;
    using System.Collections.Specialized;
    using System.ComponentModel;
    using System.Globalization;
    using System.Web;
    using System.Web.UI;
    using System.Web.Util;

    /// <devdoc>
    ///    <para>Generates a single-selection radio button group and
    ///       defines its properties.</para>
    /// </devdoc>
    [
    ValidationProperty("SelectedItem"),
    SupportsEventValidation,
    ]
    public class RadioButtonList : ListControl, IRepeatInfoUser, INamingContainer, IPostBackDataHandler {

        RadioButton _controlToRepeat;
        private bool _cachedIsEnabled;
        private bool _cachedRegisterEnabled;
        private int _offset;

        public RadioButtonList() {
            _offset = 0;
        }


        /// <devdoc>
        ///  CellPadding property.
        ///  The padding between each item.
        /// </devdoc>
        [
        WebCategory("Layout"),
        DefaultValue(-1),
        WebSysDescription(SR.RadioButtonList_CellPadding)
        ]
        public virtual int CellPadding {
            get {
                if (ControlStyleCreated == false) {
                    return -1;
                }
                return ((TableStyle)ControlStyle).CellPadding;
            }
            set {
                ((TableStyle)ControlStyle).CellPadding = value;
            }
        }


        /// <devdoc>
        ///  CellSpacing property.
        ///  The spacing between each item.
        /// </devdoc>
        [
        WebCategory("Layout"),
        DefaultValue(-1),
        WebSysDescription(SR.RadioButtonList_CellSpacing)
        ]
        public virtual int CellSpacing {
            get {
                if (ControlStyleCreated == false) {
                    return -1;
                }
                return ((TableStyle)ControlStyle).CellSpacing;
            }
            set {
                ((TableStyle)ControlStyle).CellSpacing = value;
            }
        }

        private RadioButton ControlToRepeat {
            get {
                if (_controlToRepeat != null)
                    return _controlToRepeat;

                _controlToRepeat = new RadioButton();
                _controlToRepeat.EnableViewState = false;
                Controls.Add(_controlToRepeat);

                // A note is that we don't need to set the GroupName on the radio
                // button as the radio button would simply use its naming container
                // (which would be this control) as its name attribute for postback.

                // Apply properties that are the same for each radio button
                _controlToRepeat.AutoPostBack = AutoPostBack;
                _controlToRepeat.CausesValidation = CausesValidation;
                _controlToRepeat.ValidationGroup = ValidationGroup;

                return _controlToRepeat;
            }
        }


        /// <summary>
        /// <para>Indicates whether the control will be rendered when the data source has no items.</para>
        /// </summary>
        [DefaultValue(false)]
        [Themeable(true)]
        [WebCategory("Behavior")]
        [WebSysDescription(SR.ListControl_RenderWhenDataEmpty)]
        public virtual bool RenderWhenDataEmpty {
            get {
                object o = ViewState["RenderWhenDataEmpty"];
                return ((o == null) ? false : (bool)o);
            }
            set {
                ViewState["RenderWhenDataEmpty"] = value;
            }
        }


        /// <devdoc>
        ///    Indicates the column count of radio buttons
        ///    within the group.
        /// </devdoc>
        [
        WebCategory("Layout"),
        DefaultValue(0),
        WebSysDescription(SR.RadioButtonList_RepeatColumns)
        ]
        public virtual int RepeatColumns {
            get {
                object o = ViewState["RepeatColumns"];
                return((o == null) ? 0 : (int)o);
            }
            set {
                if (value < 0) {
                    throw new ArgumentOutOfRangeException("value");
                }
                ViewState["RepeatColumns"] = value;
            }
        }


        /// <devdoc>
        ///    <para>Gets or sets the direction of flow of
        ///       the radio buttons within the group.</para>
        /// </devdoc>
        [
        WebCategory("Layout"),
        DefaultValue(RepeatDirection.Vertical),
        WebSysDescription(SR.Item_RepeatDirection)
        ]
        public virtual RepeatDirection RepeatDirection {
            get {
                object o = ViewState["RepeatDirection"];
                return((o == null) ? RepeatDirection.Vertical : (RepeatDirection)o);
            }
            set {
                if (value < RepeatDirection.Horizontal || value > RepeatDirection.Vertical) {
                    throw new ArgumentOutOfRangeException("value");
                }
                ViewState["RepeatDirection"] = value;
            }
        }


        /// <devdoc>
        ///    <para>Indicates the layout of radio buttons within the
        ///       group.</para>
        /// </devdoc>
        [
        WebCategory("Layout"),
        DefaultValue(RepeatLayout.Table),
        WebSysDescription(SR.WebControl_RepeatLayout)
        ]
        public virtual RepeatLayout RepeatLayout {
            get {
                object o = ViewState["RepeatLayout"];
                return((o == null) ? RepeatLayout.Table : (RepeatLayout)o);
            }
            set {
                EnumerationRangeValidationUtil.ValidateRepeatLayout(value);
                ViewState["RepeatLayout"] = value;
            }
        }


        /// <devdoc>
        ///    <para>
        ///       Indicates the label text alignment for the radio buttons within the group.</para>
        /// </devdoc>
        [
        WebCategory("Appearance"),
        DefaultValue(TextAlign.Right),
        WebSysDescription(SR.WebControl_TextAlign)
        ]
        public virtual TextAlign TextAlign {
            get {
                object align = ViewState["TextAlign"];
                return((align == null) ? TextAlign.Right : (TextAlign)align);
            }
            set {
                if (value < TextAlign.Left || value > TextAlign.Right) {
                    throw new ArgumentOutOfRangeException("value");
                }
                ViewState["TextAlign"] = value;
            }
        }


        /// <internalonly/>
        /// <devdoc>
        /// </devdoc>
        protected override Style CreateControlStyle() {
            return new TableStyle(ViewState);
        }


        /// <internalonly/>
        /// <devdoc>
        /// <para>Catches auto postback from a <see cref='System.Web.UI.WebControls.RadioButton'/> in the list.</para>
        /// </devdoc>
        protected override Control FindControl(string id, int pathOffset) {
            return this;
        }


        /// <internalonly/>
        /// <devdoc>
        /// <para>Loads the posted content of the list control if it is different from the last
        /// posting.</para>
        /// </devdoc>
        bool IPostBackDataHandler.LoadPostData(String postDataKey, NameValueCollection postCollection) {
            return LoadPostData(postDataKey, postCollection);
        }


        /// <internalonly/>
        /// <devdoc>
        /// <para>Loads the posted content of the list control if it is different from the last
        /// posting.</para>
        /// </devdoc>
        protected virtual bool LoadPostData(String postDataKey, NameValueCollection postCollection) {

            // When a RadioButtonList is disabled, then there is no postback data for it.
            // Since RadioButtonList doesn't call RegisterRequiresPostBack, this method will
            // never be called, so we don't need to worry about ignoring empty postback data.

            string post = postCollection[postDataKey];
            int currentSelectedIndex = SelectedIndex;

            EnsureDataBoundInLoadPostData();

            int n = Items.Count;
            for (int i=0; i < n; i++) {
                if (post == Items[i].Value && Items[i].Enabled) {
                    ValidateEvent(postDataKey, post);

                    if (i != currentSelectedIndex) {
                        SetPostDataSelection(i);
                        return true;
                    }
                    return false;
                }
            }

            return false;
        }


        /// <internalonly/>
        /// <devdoc>
        /// <para>Invokes the OnSelectedIndexChanged
        /// method whenever posted data for the <see cref='System.Web.UI.WebControls.RadioButtonList'/>
        /// control has changed.</para>
        /// </devdoc>
        void IPostBackDataHandler.RaisePostDataChangedEvent() {
            RaisePostDataChangedEvent();
        }


        /// <internalonly/>
        /// <devdoc>
        /// <para>Invokes the OnSelectedIndexChanged
        /// method whenever posted data for the <see cref='System.Web.UI.WebControls.RadioButtonList'/>
        /// control has changed.</para>
        /// </devdoc>
        protected virtual void RaisePostDataChangedEvent() {
            if (AutoPostBack && Page != null && !Page.IsPostBackEventControlRegistered) {
                // VSWhidbey 204824
                Page.AutoPostBackControl = this;

                if (CausesValidation) {
                    Page.Validate(ValidationGroup);
                }
            }
            OnSelectedIndexChanged(EventArgs.Empty);
        }

        protected internal override void OnInit(EventArgs e) {
            base.OnInit(e);

            if (!DesignMode && !String.IsNullOrEmpty(ItemType)) {
                DataBoundControlHelper.EnableDynamicData(this, ItemType);
            }
        }

        protected internal override void Render(HtmlTextWriter writer) {
            // Rendering an empty table is not valid xhtml or html 4, so throw
            if (RepeatLayout == RepeatLayout.Table && RenderWhenDataEmpty) {
                throw new InvalidOperationException(SR.GetString(SR.ListControl_RenderWhenDataEmptyNotSupportedWithTableLayout, ID));
            }

            // Don't render anything if the control is empty (unless the developer opts in by setting RenderWhenDataEmpty). 
            // empty table is not xhtml compliant.
            if (Items.Count == 0 && !EnableLegacyRendering && !RenderWhenDataEmpty) {
                return;
            }

            RepeatInfo repeatInfo = new RepeatInfo();
            Style style = (ControlStyleCreated ? ControlStyle : null);
            short tabIndex = TabIndex;
            bool undirtyTabIndex = false;

            // TabIndex here is special... it needs to be applied to the individual
            // radiobuttons and not the outer control itself

            // cache away the TabIndex property state
            ControlToRepeat.TabIndex = tabIndex;

            if (tabIndex != 0) {
                if (ViewState.IsItemDirty("TabIndex") == false) {
                    undirtyTabIndex = true;
                }
                TabIndex = 0;
            }

            repeatInfo.RepeatColumns = RepeatColumns;
            repeatInfo.RepeatDirection = RepeatDirection;

            // If the device does not support tables, use the flow layout to render
            if (!DesignMode && !Context.Request.Browser.Tables) {
                repeatInfo.RepeatLayout = RepeatLayout.Flow;
            }
            else {
                repeatInfo.RepeatLayout = RepeatLayout;
            }

            if (repeatInfo.RepeatLayout == RepeatLayout.Flow) {
                repeatInfo.EnableLegacyRendering = EnableLegacyRendering;
            }

            repeatInfo.RenderRepeater(writer, (IRepeatInfoUser)this, style, this);

            if (Page != null) {
                Page.ClientScript.RegisterForEventValidation(UniqueID);
            }

            // restore the state of the TabIndex property
            if (tabIndex != 0) {
                TabIndex = tabIndex;
            }
            if (undirtyTabIndex) {
                ViewState.SetItemDirty("TabIndex", false);
            }
        }


        /// <internalonly/>
        /// <devdoc>
        /// </devdoc>
        bool IRepeatInfoUser.HasFooter {
            get {
                return HasFooter;
            }
        }


        /// <internalonly/>
        /// <devdoc>
        /// </devdoc>
        protected virtual bool HasFooter {
            get {
                return false;
            }
        }


        /// <internalonly/>
        /// <devdoc>
        /// </devdoc>
        bool IRepeatInfoUser.HasHeader {
            get {
                return HasHeader;
            }
        }


        /// <internalonly/>
        /// <devdoc>
        /// </devdoc>
        protected virtual bool HasHeader {
            get {
                return false;
            }
        }


        /// <internalonly/>
        /// <devdoc>
        /// </devdoc>
        bool IRepeatInfoUser.HasSeparators {
            get {
                return HasSeparators;
            }
        }


        /// <internalonly/>
        /// <devdoc>
        /// </devdoc>
        protected virtual bool HasSeparators {
            get {
                return false;
            }
        }


        /// <internalonly/>
        /// <devdoc>
        /// </devdoc>
        int IRepeatInfoUser.RepeatedItemCount {
            get {
                return RepeatedItemCount;
            }
        }


        /// <internalonly/>
        /// <devdoc>
        /// </devdoc>
        protected virtual int RepeatedItemCount {
            get {
                return (Items != null) ? Items.Count : 0;
            }
        }


        /// <internalonly/>
        /// <devdoc>
        /// </devdoc>
        Style IRepeatInfoUser.GetItemStyle(ListItemType itemType, int repeatIndex) {
            return GetItemStyle(itemType, repeatIndex);
        }


        /// <internalonly/>
        /// <devdoc>
        /// </devdoc>
        protected virtual Style GetItemStyle(ListItemType itemType, int repeatIndex) {
            return null;
        }


        /// <internalonly/>
        /// <devdoc>
        /// Called by the RepeatInfo helper to render each item
        /// </devdoc>
        void IRepeatInfoUser.RenderItem(ListItemType itemType, int repeatIndex, RepeatInfo repeatInfo, HtmlTextWriter writer) {
            RenderItem(itemType, repeatIndex, repeatInfo, writer);
        }


        /// <internalonly/>
        /// <devdoc>
        /// Called by the RepeatInfo helper to render each item
        /// </devdoc>
        protected virtual void RenderItem(ListItemType itemType, int repeatIndex, RepeatInfo repeatInfo, HtmlTextWriter writer) {
            if (repeatIndex == 0) {
                _cachedIsEnabled = IsEnabled;
                _cachedRegisterEnabled = (Page != null) && (SaveSelectedIndicesViewState == false);
            }

            RadioButton controlToRepeat = ControlToRepeat;

            // Apply properties of the list items
            int repeatIndexOffset = repeatIndex + _offset;

            ListItem item = Items[repeatIndexOffset];

            // VSWhidbey 153920 Render expando attributes.
            controlToRepeat.Attributes.Clear();
            if (item.HasAttributes) {
                foreach (string key in item.Attributes.Keys) {
                    controlToRepeat.Attributes[key] = item.Attributes[key];
                }
            }

            // Dev10 684108: reset the CssClass for each item.
            if (!string.IsNullOrEmpty(controlToRepeat.CssClass)) {
                controlToRepeat.CssClass = "";
            }

            SetControlToRepeatID(this, controlToRepeat, repeatIndexOffset);
            controlToRepeat.Text = item.Text;

            controlToRepeat.Attributes["value"] = item.Value;
            controlToRepeat.Checked = item.Selected;
            controlToRepeat.Enabled = _cachedIsEnabled && item.Enabled;
            controlToRepeat.TextAlign = TextAlign;
            controlToRepeat.RenderControl(writer);

            if (controlToRepeat.Enabled && _cachedRegisterEnabled && Page != null) {
                // Store a client-side array of enabled control, so we can re-enable them on
                // postback (in case they are disabled client-side)
                // Postback is needed when SelectedIndices is not saved in view state
                Page.RegisterEnabledControl(controlToRepeat);
            }
        }
    }
}