/* Items.cs
 * part of zaaReloaded2
 * 
 * Copyright 2015 Daniel Kraus
 * 
 * Licensed 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.
 */
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using Microsoft.Office.Interop.Word;
using zaaReloaded2.LabModel;
using System.Diagnostics;

namespace zaaReloaded2.Formatter.Elements
{
    /// <summary>
    /// This formatting element is concerned with writing <see cref="LabItem"/>s
    /// to a Word document.
    /// </summary>
    class Items : ElementBase
    {
        #region ElementBase implementation

        public override string Label
        {
            get { return Line; }
        }

        public override void Run(Formatter formatter)
        {
            bool _needComma = false;

            // Find out if we have any items that we can write
            // to the document
            List<ItemFormatter> items = new List<ItemFormatter>();
            if (_items != null && _items.Count > 0)
            {
                foreach (string itemName in _items)
                {
                    TimePointFormatter tpf = formatter.WorkingTimePoints
                        .FirstOrDefault(tp => tp.Value.ContainsItem(itemName))
                        .Value;
                    if (tpf != null)
                    {
                        // If tpf is not null, this means that it contains an
                        // item with itemName.
                        items.Add(tpf.ItemFormatters[itemName]);
                    }
                }
            }

            // If there are items, write the caption (if any), then the items
            if (items.Count > 0)
            {
                if (!String.IsNullOrEmpty(_caption))
                {
                    formatter.Document.Range().InsertAfter(
                        String.Format("{0}: ", _caption)
                        );
                };
                foreach (ItemFormatter i in items)
                {
                    if (_needComma)
                    {
                        formatter.Document.Range().InsertAfter(", ");
                    }
                    else
                    {
                        _needComma = true;
                    }
                    i.WriteToDocument(formatter.Document);
                }
            }
        }

        #endregion

        #region Properties

        /// <summary>
        /// Gets or sets a text line that contains a comma-separated list of
        /// parsable laboratory item names. The list may optionally be preceded
        /// with a caption followed by a colon.
        /// </summary>
        public string Line
        {
            [DebuggerStepThrough]
            get
            {
                return _line;
            }
            set
            {
                _line = value;
                ParseLine();
            }
        }

        #endregion

        #region Constructors

        public Items() : base() { }

        public Items(string line)
            : this()
        {
            Line = line;
        }

        #endregion

        #region Private methods

        /// <summary>
        /// Parses the Line and splits it into an optional caption and individual
        /// items.
        /// </summary>
        void ParseLine()
        {
            _items = null;
            _caption = null;
            Regex r = new Regex(@"((?<caption>[^:]+):\s*)?((?<items>[^,]+),\s*)+");
            Match m = r.Match(Line);
            if (m.Success)
            {
                if (m.Groups["caption"].Success)
                {
                    _caption = m.Groups["caption"].Value;
                }
                _items = m.Groups["items"].Captures
                    .Cast<Capture>()
                    .Select<Capture, string>(c => c.Value).ToList<string>();
            }
        }

        #endregion

        #region Fields

        string _line;
        string _caption;
        List<string> _items;

        #endregion
    }
}