#region PDFsharp - A .NET library for processing PDF
//
// Authors:
//   Stefan Lange
//
// Copyright (c) 2005-2017 empira Software GmbH, Cologne Area (Germany)
//
// http://www.pdfsharp.com
// http://sourceforge.net/projects/pdfsharp
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 
// DEALINGS IN THE SOFTWARE.
#endregion

using PdfSharp.Pdf.Annotations;
using PdfSharp.Pdf.Advanced;

namespace PdfSharp.Pdf.AcroForms
{
    /// <summary>
    /// Represents the check box field.
    /// </summary>
    public sealed class PdfCheckBoxField : PdfButtonField
    {
        /// <summary>
        /// Initializes a new instance of PdfCheckBoxField.
        /// </summary>
        internal PdfCheckBoxField(PdfDocument document)
            : base(document)
        {
            _document = document;
        }

        internal PdfCheckBoxField(PdfDictionary dict)
            : base(dict)
        { }

#if true_
        /// <summary>
        /// Indicates whether the field is checked.
        /// </summary>
        public bool Checked  //R080317 // TODO
        {
            get
            {
                if (!HasKids)
                {
                    string value = Elements.GetString(Keys.V);
                    //return !String.IsNullOrEmpty(value) && value != UncheckedValue;
                    return !String.IsNullOrEmpty(value) && value == CheckedName;
                }

                if (Fields.Elements.Items.Length == 2)
                {
                    string value = ((PdfDictionary)(((PdfReference)(Fields.Elements.Items[0])).Value)).Elements.GetString(Keys.V);
                    //bool bReturn = value.Length != 0 && value != UncheckedValue; //R081114 (3Std.!!) auch auf Nein prüfen; //TODO woher kommt der Wert?
                    bool bReturn = value.Length != 0 && value == CheckedName;
                    return bReturn;
                }

                // NYI: Return false in any other case. 
                return false;
            }

            set
            {
                if (!HasKids)
                {
                    //string name = value ? GetNonOffValue() : "/Off";
                    string name = value ? CheckedName : UncheckedName;
                    Elements.SetName(Keys.V, name);
                    Elements.SetName(PdfAnnotation.Keys.AS, name);
                }
                else
                {
                    // Here we have to handle fields that exist twice with the same name.
                    // Checked must be set for both fields, using /Off for one field and skipping /Off for the other,
                    // to have only one field with a check mark.
                    // Finding this took me two working days.
                    if (Fields.Elements.Items.Length == 2)
                    {
                        if (value)
                        {
                            //Element 0 behandeln -> auf checked setzen
                            string name1 = "";
                            PdfDictionary o = ((PdfDictionary)(((PdfReference)(Fields.Elements.Items[0])).Value)).Elements["/AP"] as PdfDictionary;
                            if (o != null)
                            {
                                PdfDictionary n = o.Elements["/N"] as PdfDictionary;
                                if (n != null)
                                {
                                    foreach (string name in n.Elements.Keys)
                                    {
                                        //if (name != UncheckedValue)
                                        if (name == CheckedName)
                                        {
                                            name1 = name;
                                            break;
                                        }
                                    }
                                }
                            }
                            if (name1.Length != 0)
                            {
                                ((PdfDictionary)(((PdfReference)(Fields.Elements.Items[0])).Value)).Elements.SetName(Keys.V, name1);
                                ((PdfDictionary)(((PdfReference)(Fields.Elements.Items[0])).Value)).Elements.SetName(PdfAnnotation.Keys.AS, name1);
                            }

                            //Element 1 behandeln -> auf unchecked setzen
                            o = ((PdfDictionary)(((PdfReference)(Fields.Elements.Items[1])).Value)).Elements["/AP"] as PdfDictionary;
                            if (o != null)
                            {
                                PdfDictionary n = o.Elements["/N"] as PdfDictionary;
                                if (n != null)
                                {
                                    foreach (string name in n.Elements.Keys)
                                    {
                                        if (name == UncheckedName)
                                        {
                                            name1 = name;
                                            break;
                                        }
                                    }
                                }
                            }
                            if (!String.IsNullOrEmpty(name1))
                            {
                                ((PdfDictionary)(((PdfReference)(Fields.Elements.Items[1])).Value)).Elements.SetName(Keys.V, name1);
                                ((PdfDictionary)(((PdfReference)(Fields.Elements.Items[1])).Value)).Elements.SetName(PdfAnnotation.Keys.AS, name1);
                            }
                        }
                        else
                        {
                            //Element 0 behandeln -> auf unchecked setzen
                            string name1 = "";
                            PdfDictionary o = ((PdfDictionary)(((PdfReference)(Fields.Elements.Items[1])).Value)).Elements["/AP"] as PdfDictionary;
                            if (o != null)
                            {
                                PdfDictionary n = o.Elements["/N"] as PdfDictionary;
                                if (n != null)
                                {
                                    foreach (string name in n.Elements.Keys)
                                    {
                                        //if (name != UncheckedValue)
                                        if (name == CheckedName)
                                        {
                                            name1 = name;
                                            break;
                                        }
                                    }
                                }
                            }
                            if (name1.Length != 0)
                            {
                                ((PdfDictionary)(((PdfReference)(Fields.Elements.Items[1])).Value)).Elements.SetName(Keys.V, name1);
                                ((PdfDictionary)(((PdfReference)(Fields.Elements.Items[1])).Value)).Elements.SetName(PdfAnnotation.Keys.AS, name1);
                            }

                            //Element 1 behandeln -> auf checked setzen
                            o = ((PdfDictionary)(((PdfReference)(Fields.Elements.Items[0])).Value)).Elements["/AP"] as PdfDictionary;
                            if (o != null)
                            {
                                PdfDictionary n = o.Elements["/N"] as PdfDictionary;
                                if (n != null)
                                {
                                    foreach (string name in n.Elements.Keys)
                                    {
                                        if (name == UncheckedName)
                                        {
                                            name1 = name;
                                            break;
                                        }
                                    }
                                }
                            }
                            if (name1.Length != 0)
                            {
                                ((PdfDictionary)(((PdfReference)(Fields.Elements.Items[0])).Value)).Elements.SetName(Keys.V, name1);
                                ((PdfDictionary)(((PdfReference)(Fields.Elements.Items[0])).Value)).Elements.SetName(PdfAnnotation.Keys.AS, name1);
                            }
                        }
                    }
                }
            }
        }

#else
        /// <summary>
        /// Indicates whether the field is checked.
        /// </summary>
        public bool Checked
        {
            get
            {
                if (!HasKids) //R080317
                {
                    string value = Elements.GetString(Keys.V);
                    return value.Length != 0 && value != "/Off";
                }
                else //R080317
                {
                    if (Fields.Elements.Items.Length == 2)
                    {
                        string value = ((PdfDictionary)(((PdfReference)(Fields.Elements.Items[0])).Value)).Elements.GetString(Keys.V);
                        bool bReturn = value.Length != 0 && value != "/Off" && value != "/Nein"; //R081114 (3Std.!!) auch auf Nein prüfen; //TODO woher kommt der Wert?
                        return bReturn;
                    }
                    else
                        return false;
                }
            }
            set
            {
                if (!HasKids)
                {
                    string name = value ? GetNonOffValue() : "/Off";
                    Elements.SetName(Keys.V, name);
                    Elements.SetName(PdfAnnotation.Keys.AS, name);
                }
                else
                {
                    // Here we have to handle fields that exist twice with the same name.
                    // Checked must be set for both fields, using /Off for one field and skipping /Off for the other,
                    // to have only one field with a check mark.
                    // Finding this took me two working days.
                    if (Fields.Elements.Items.Length == 2)
                    {
                        if (value)
                        {
                            //Element 0 behandeln -> auf checked setzen
                            string name1 = "";
                            PdfDictionary o = ((PdfDictionary)(((PdfReference)(Fields.Elements.Items[0])).Value)).Elements["/AP"] as PdfDictionary;
                            if (o != null)
                            {
                                PdfDictionary n = o.Elements["/N"] as PdfDictionary;
                                if (n != null)
                                {
                                    foreach (string name in n.Elements.Keys)
                                    {
                                        if (name != "/Off")
                                        {
                                            name1 = name;
                                            break;
                                        }
                                    }
                                }
                            }
                            if (name1.Length != 0)
                            {
                                ((PdfDictionary)(((PdfReference)(Fields.Elements.Items[0])).Value)).Elements.SetName(Keys.V, name1);
                                ((PdfDictionary)(((PdfReference)(Fields.Elements.Items[0])).Value)).Elements.SetName(PdfAnnotation.Keys.AS, name1);
                            }

                            //Element 1 behandeln -> auf unchecked setzen
                            o = ((PdfDictionary)(((PdfReference)(Fields.Elements.Items[1])).Value)).Elements["/AP"] as PdfDictionary;
                            if (o != null)
                            {
                                PdfDictionary n = o.Elements["/N"] as PdfDictionary;
                                if (n != null)
                                {
                                    foreach (string name in n.Elements.Keys)
                                    {
                                        if (name == "/Off")
                                        {
                                            name1 = name;
                                            break;
                                        }
                                    }
                                }
                            }
                            if (name1.Length != 0)
                            {
                                ((PdfDictionary)(((PdfReference)(Fields.Elements.Items[1])).Value)).Elements.SetName(Keys.V, name1);
                                ((PdfDictionary)(((PdfReference)(Fields.Elements.Items[1])).Value)).Elements.SetName(PdfAnnotation.Keys.AS, name1);
                            }

                        }
                        else
                        {
                            //Element 0 behandeln -> auf unchecked setzen
                            string name1 = "";
                            PdfDictionary o = ((PdfDictionary)(((PdfReference)(Fields.Elements.Items[1])).Value)).Elements["/AP"] as PdfDictionary;
                            if (o != null)
                            {
                                PdfDictionary n = o.Elements["/N"] as PdfDictionary;
                                if (n != null)
                                {
                                    foreach (string name in n.Elements.Keys)
                                    {
                                        if (name != "/Off")
                                        {
                                            name1 = name;
                                            break;
                                        }
                                    }
                                }
                            }
                            if (name1.Length != 0)
                            {
                                ((PdfDictionary)(((PdfReference)(Fields.Elements.Items[1])).Value)).Elements.SetName(Keys.V, name1);
                                ((PdfDictionary)(((PdfReference)(Fields.Elements.Items[1])).Value)).Elements.SetName(PdfAnnotation.Keys.AS, name1);
                            }

                            //Element 1 behandeln -> auf checked setzen
                            o = ((PdfDictionary)(((PdfReference)(Fields.Elements.Items[0])).Value)).Elements["/AP"] as PdfDictionary;
                            if (o != null)
                            {
                                PdfDictionary n = o.Elements["/N"] as PdfDictionary;
                                if (n != null)
                                {
                                    foreach (string name in n.Elements.Keys)
                                    {
                                        if (name == "/Off")
                                        {
                                            name1 = name;
                                            break;
                                        }
                                    }
                                }
                            }
                            if (name1.Length != 0)
                            {
                                ((PdfDictionary)(((PdfReference)(Fields.Elements.Items[0])).Value)).Elements.SetName(Keys.V, name1);
                                ((PdfDictionary)(((PdfReference)(Fields.Elements.Items[0])).Value)).Elements.SetName(PdfAnnotation.Keys.AS, name1);
                            }
                        }
                    }
                }
            }
        }
#endif

        /// <summary>
        /// Gets or sets the name of the dictionary that represents the Checked state.
        /// </summary>
        /// The default value is "/Yes".
        public string CheckedName
        {
            get { return _checkedName; }
            set { _checkedName = value; }
        }
        string _checkedName = "/Yes";

        /// <summary>
        /// Gets or sets the name of the dictionary that represents the Unchecked state.
        /// The default value is "/Off".
        /// </summary>
        public string UncheckedName
        {
            get { return _uncheckedName; }
            set { _uncheckedName = value; }
        }
        string _uncheckedName = "/Off";

        /// <summary>
        /// Predefined keys of this dictionary. 
        /// The description comes from PDF 1.4 Reference.
        /// </summary>
        public new class Keys : PdfButtonField.Keys
        {
            /// <summary>
            /// (Optional; inheritable; PDF 1.4) A text string to be used in place of the V entry for the
            /// value of the field.
            /// </summary>
            [KeyInfo(KeyType.TextString | KeyType.Optional)]
            public const string Opt = "/Opt";

            /// <summary>
            /// Gets the KeysMeta for these keys.
            /// </summary>
            internal static DictionaryMeta Meta
            {
                get { return _meta ?? (_meta = CreateMeta(typeof(Keys))); }
            }
            static DictionaryMeta _meta;
        }

        /// <summary>
        /// Gets the KeysMeta of this dictionary type.
        /// </summary>
        internal override DictionaryMeta Meta
        {
            get { return Keys.Meta; }
        }
    }
}
