#region Disclaimer / License

// Copyright (C) 2013, Jackie Ng
// http://trac.osgeo.org/mapguide/wiki/maestro, jumpinjackie@gmail.com
//
// Original code from SharpDevelop 3.2.1 licensed under the same terms (LGPL 2.1)
// Copyright 2002-2010 by
//
//  AlphaSierraPapa, Christoph Wille
//  Vordernberger Strasse 27/8
//  A-8700 Leoben
//  Austria
//
//  email: office@alphasierrapapa.com
//  court of jurisdiction: Landesgericht Leoben
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
//

#endregion Disclaimer / License

using ICSharpCode.TextEditor.Gui.CompletionWindow;
using System;
using System.Collections.Generic;
using System.Text;

namespace Maestro.Editors.Generic.XmlEditor.AutoCompletion
{
    /// <summary>
    ///   A collection that stores <see cref='XmlSchemaCompletionData'/> objects.
    /// </summary>
    [Serializable]
    internal class XmlSchemaCompletionDataCollection : System.Collections.CollectionBase
    {
        /// <summary>
        ///   Initializes a new instance of <see cref='XmlSchemaCompletionDataCollection'/>.
        /// </summary>
        public XmlSchemaCompletionDataCollection()
        {
        }

        /// <summary>
        ///   Initializes a new instance of <see cref='XmlSchemaCompletionDataCollection'/> based on another <see cref='XmlSchemaCompletionDataCollection'/>.
        /// </summary>
        /// <param name='val'>
        ///   A <see cref='XmlSchemaCompletionDataCollection'/> from which the contents are copied
        /// </param>
        public XmlSchemaCompletionDataCollection(XmlSchemaCompletionDataCollection val)
        {
            this.AddRange(val);
        }

        /// <summary>
        ///   Initializes a new instance of <see cref='XmlSchemaCompletionDataCollection'/> containing any array of <see cref='XmlSchemaCompletionData'/> objects.
        /// </summary>
        /// <param name='val'>
        ///       A array of <see cref='XmlSchemaCompletionData'/> objects with which to intialize the collection
        /// </param>
        public XmlSchemaCompletionDataCollection(XmlSchemaCompletionData[] val)
        {
            this.AddRange(val);
        }

        /// <summary>
        ///   Represents the entry at the specified index of the <see cref='XmlSchemaCompletionData'/>.
        /// </summary>
        /// <param name='index'>The zero-based index of the entry to locate in the collection.</param>
        /// <value>The entry at the specified index of the collection.</value>
        /// <exception cref='ArgumentOutOfRangeException'><paramref name='index'/> is outside the valid range of indexes for the collection.</exception>
        public XmlSchemaCompletionData this[int index]
        {
            get
            {
                return ((XmlSchemaCompletionData)(List[index]));
            }
            set
            {
                List[index] = value;
            }
        }

        public ICompletionData[] GetNamespaceCompletionData()
        {
            List<ICompletionData> completionItems = new List<ICompletionData>();

            foreach (XmlSchemaCompletionData schema in this)
            {
                XmlCompletionData completionData = new XmlCompletionData(schema.NamespaceUri, XmlCompletionData.DataType.NamespaceUri);
                completionItems.Add(completionData);
            }

            return completionItems.ToArray();
        }

        /// <summary>
        ///   Represents the <see cref='XmlSchemaCompletionData'/> entry with the specified namespace URI.
        /// </summary>
        /// <param name='namespaceUri'>The schema's namespace URI.</param>
        /// <value>The entry with the specified namespace URI.</value>
        public XmlSchemaCompletionData this[string namespaceUri]
        {
            get
            {
                return GetItem(namespaceUri);
            }
        }

        /// <summary>
        ///   Adds a <see cref='XmlSchemaCompletionData'/> with the specified value to the
        ///   <see cref='XmlSchemaCompletionDataCollection'/>.
        /// </summary>
        /// <param name='val'>The <see cref='XmlSchemaCompletionData'/> to add.</param>
        /// <returns>The index at which the new element was inserted.</returns>
        public int Add(XmlSchemaCompletionData val)
        {
            return List.Add(val);
        }

        /// <summary>
        ///   Copies the elements of an array to the end of the <see cref='XmlSchemaCompletionDataCollection'/>.
        /// </summary>
        /// <param name='val'>
        ///    An array of type <see cref='XmlSchemaCompletionData'/> containing the objects to add to the collection.
        /// </param>
        /// <seealso cref='XmlSchemaCompletionDataCollection.Add'/>
        public void AddRange(XmlSchemaCompletionData[] val)
        {
            for (int i = 0; i < val.Length; i++)
            {
                this.Add(val[i]);
            }
        }

        /// <summary>
        ///   Adds the contents of another <see cref='XmlSchemaCompletionDataCollection'/> to the end of the collection.
        /// </summary>
        /// <param name='val'>
        ///    A <see cref='XmlSchemaCompletionDataCollection'/> containing the objects to add to the collection.
        /// </param>
        /// <seealso cref='XmlSchemaCompletionDataCollection.Add'/>
        public void AddRange(XmlSchemaCompletionDataCollection val)
        {
            for (int i = 0; i < val.Count; i++)
            {
                this.Add(val[i]);
            }
        }

        /// <summary>
        ///   Gets a value indicating whether the
        ///    <see cref='XmlSchemaCompletionDataCollection'/> contains the specified <see cref='XmlSchemaCompletionData'/>.
        /// </summary>
        /// <param name='val'>The <see cref='XmlSchemaCompletionData'/> to locate.</param>
        /// <returns>
        /// <see langword='true'/> if the <see cref='XmlSchemaCompletionData'/> is contained in the collection;
        ///   otherwise, <see langword='false'/>.
        /// </returns>
        /// <seealso cref='XmlSchemaCompletionDataCollection.IndexOf'/>
        public bool Contains(XmlSchemaCompletionData val)
        {
            return List.Contains(val);
        }

        /// <summary>
        ///   Copies the <see cref='XmlSchemaCompletionDataCollection'/> values to a one-dimensional <see cref='Array'/> instance at the
        ///    specified index.
        /// </summary>
        /// <param name='array'>The one-dimensional <see cref='Array'/> that is the destination of the values copied from <see cref='XmlSchemaCompletionDataCollection'/>.</param>
        /// <param name='index'>The index in <paramref name='array'/> where copying begins.</param>
        /// <exception cref='ArgumentException'>
        ///   <para><paramref name='array'/> is multidimensional.</para>
        ///   <para>-or-</para>
        ///   <para>The number of elements in the <see cref='XmlSchemaCompletionDataCollection'/> is greater than
        ///         the available space between <paramref name='index'/> and the end of
        ///         <paramref name='array'/>.</para>
        /// </exception>
        /// <exception cref='ArgumentNullException'><paramref name='array'/> is <see langword='null'/>. </exception>
        /// <exception cref='ArgumentOutOfRangeException'><paramref name='index'/> is less than <paramref name='array'/>'s lowbound. </exception>
        /// <seealso cref='Array'/>
        public void CopyTo(XmlSchemaCompletionData[] array, int index)
        {
            List.CopyTo(array, index);
        }

        /// <summary>
        ///    Returns the index of a <see cref='XmlSchemaCompletionData'/> in
        ///       the <see cref='XmlSchemaCompletionDataCollection'/>.
        /// </summary>
        /// <param name='val'>The <see cref='XmlSchemaCompletionData'/> to locate.</param>
        /// <returns>
        ///   The index of the <see cref='XmlSchemaCompletionData'/> of <paramref name='val'/> in the
        ///   <see cref='XmlSchemaCompletionDataCollection'/>, if found; otherwise, -1.
        /// </returns>
        /// <seealso cref='XmlSchemaCompletionDataCollection.Contains'/>
        public int IndexOf(XmlSchemaCompletionData val)
        {
            return List.IndexOf(val);
        }

        /// <summary>
        ///   Inserts a <see cref='XmlSchemaCompletionData'/> into the <see cref='XmlSchemaCompletionDataCollection'/> at the specified index.
        /// </summary>
        /// <param name='index'>The zero-based index where <paramref name='val'/> should be inserted.</param>
        /// <param name='val'>The <see cref='XmlSchemaCompletionData'/> to insert.</param>
        /// <seealso cref='XmlSchemaCompletionDataCollection.Add'/>
        public void Insert(int index, XmlSchemaCompletionData val)
        {
            List.Insert(index, val);
        }

        /// <summary>
        ///  Returns an enumerator that can iterate through the <see cref='XmlSchemaCompletionDataCollection'/>.
        /// </summary>
        public new XmlSchemaCompletionDataEnumerator GetEnumerator()
        {
            return new XmlSchemaCompletionDataEnumerator(this);
        }

        /// <summary>
        ///   Removes a specific <see cref='XmlSchemaCompletionData'/> from the <see cref='XmlSchemaCompletionDataCollection'/>.
        /// </summary>
        /// <param name='val'>The <see cref='XmlSchemaCompletionData'/> to remove from the <see cref='XmlSchemaCompletionDataCollection'/>.</param>
        /// <exception cref='ArgumentException'><paramref name='val'/> is not found in the Collection.</exception>
        public void Remove(XmlSchemaCompletionData val)
        {
            List.Remove(val);
        }

        /// <summary>
        /// Gets the schema completion data with the same filename.
        /// </summary>
        /// <returns><see langword="null"/> if no matching schema found.</returns>
        public XmlSchemaCompletionData GetSchemaFromFileName(string fileName)
        {
            foreach (XmlSchemaCompletionData schema in this)
            {
                if (IsEqualFileName(schema.FileName, fileName))
                {
                    return schema;
                }
            }
            return null;
        }

        private static string NormalizePath(string fileName)
        {
            if (string.IsNullOrEmpty(fileName)) return fileName;

            int i;

            bool isWeb = false;
            for (i = 0; i < fileName.Length; i++)
            {
                if (fileName[i] == '/' || fileName[i] == '\\')
                    break;
                if (fileName[i] == ':')
                {
                    if (i > 1)
                        isWeb = true;
                    break;
                }
            }

            char outputSeparator = isWeb ? '/' : System.IO.Path.DirectorySeparatorChar;

            StringBuilder result = new StringBuilder();
            if (isWeb == false && fileName.StartsWith(@"\\") || fileName.StartsWith("//"))
            {
                i = 2;
                result.Append(outputSeparator);
            }
            else
            {
                i = 0;
            }
            int segmentStartPos = i;
            for (; i <= fileName.Length; i++)
            {
                if (i == fileName.Length || fileName[i] == '/' || fileName[i] == '\\')
                {
                    int segmentLength = i - segmentStartPos;
                    switch (segmentLength)
                    {
                        case 0:
                            // ignore empty segment (if not in web mode)
                            // On unix, don't ignore empty segment if i==0
                            if (isWeb || (i == 0 && Environment.OSVersion.Platform == PlatformID.Unix))
                            {
                                result.Append(outputSeparator);
                            }
                            break;

                        case 1:
                            // ignore /./ segment, but append other one-letter segments
                            if (fileName[segmentStartPos] != '.')
                            {
                                if (result.Length > 0) result.Append(outputSeparator);
                                result.Append(fileName[segmentStartPos]);
                            }
                            break;

                        case 2:
                            if (fileName[segmentStartPos] == '.' && fileName[segmentStartPos + 1] == '.')
                            {
                                // remove previous segment
                                int j;
                                for (j = result.Length - 1; j >= 0 && result[j] != outputSeparator; j--)
                                {
                                }

                                if (j > 0)
                                {
                                    result.Length = j;
                                }
                                break;
                            }
                            else
                            {
                                // append normal segment
                                goto default;
                            }
                        default:
                            if (result.Length > 0) result.Append(outputSeparator);
                            result.Append(fileName, segmentStartPos, segmentLength);
                            break;
                    }
                    segmentStartPos = i + 1; // remember start position for next segment
                }
            }
            if (isWeb == false)
            {
                if (result.Length > 0 && result[result.Length - 1] == outputSeparator)
                {
                    result.Length -= 1;
                }
                if (result.Length == 2 && result[1] == ':')
                {
                    result.Append(outputSeparator);
                }
            }
            return result.ToString();
        }

        private bool IsEqualFileName(string fileName1, string fileName2)
        {
            return string.Equals(NormalizePath(fileName1),
                                 NormalizePath(fileName2),
                                 StringComparison.OrdinalIgnoreCase);
        }

        /// <summary>
        ///   Enumerator that can iterate through a XmlSchemaCompletionDataCollection.
        /// </summary>
        /// <seealso cref='XmlSchemaCompletionDataCollection'/>
        /// <seealso cref='XmlSchemaCompletionData'/>
        public class XmlSchemaCompletionDataEnumerator : System.Collections.IEnumerator
        {
            private readonly System.Collections.IEnumerator baseEnumerator;
            private System.Collections.IEnumerable temp;

            /// <summary>
            ///   Initializes a new instance of <see cref='XmlSchemaCompletionDataEnumerator'/>.
            /// </summary>
            public XmlSchemaCompletionDataEnumerator(XmlSchemaCompletionDataCollection mappings)
            {
                this.temp = ((System.Collections.IEnumerable)(mappings));
                this.baseEnumerator = temp.GetEnumerator();
            }

            /// <summary>
            ///   Gets the current <see cref='XmlSchemaCompletionData'/> in the <seealso cref='XmlSchemaCompletionDataCollection'/>.
            /// </summary>
            public XmlSchemaCompletionData Current
            {
                get
                {
                    return ((XmlSchemaCompletionData)(baseEnumerator.Current));
                }
            }

            object System.Collections.IEnumerator.Current
            {
                get
                {
                    return baseEnumerator.Current;
                }
            }

            /// <summary>
            ///   Advances the enumerator to the next <see cref='XmlSchemaCompletionData'/> of the <see cref='XmlSchemaCompletionDataCollection'/>.
            /// </summary>
            public bool MoveNext()
            {
                return baseEnumerator.MoveNext();
            }

            /// <summary>
            ///   Sets the enumerator to its initial position, which is before the first element in the <see cref='XmlSchemaCompletionDataCollection'/>.
            /// </summary>
            public void Reset()
            {
                baseEnumerator.Reset();
            }
        }

        private XmlSchemaCompletionData GetItem(string namespaceUri)
        {
            XmlSchemaCompletionData matchedItem = null;

            foreach (XmlSchemaCompletionData item in this)
            {
                if (item.NamespaceUri == namespaceUri)
                {
                    matchedItem = item;
                    break;
                }
            }

            return matchedItem;
        }
    }
}