/* LaurisTimePoint.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.Diagnostics;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using zaaReloaded2.Dictionaries;
using zaaReloaded2.LabModel;

namespace zaaReloaded2.Importer.ZaaImporter
{
    /// <summary>
    /// Holds all laboratory items for a given time point.
    /// </summary>
    class LaurisTimePoint : TimePoint
    {
        #region Properties

        /// <summary>
        /// Gets an array of paragraphs in this LaurisText.
        /// </summary>
        public string[] Paragraphs { get; private set; }

        /// <summary>
        /// Is true if the LaurisText has time stamp in the first
        /// paragraph and <see cref="LabItem"/>s in the others.
        /// </summary>
        public bool IsValidTimePoint { get; private set; }

        /// <summary>
        /// Gets or sets the original Lauris text for this timepoint.
        /// </summary>
        public string LaurisText
        {
            [DebuggerStepThrough]
            get
            {
                return String.Join(Environment.NewLine, Paragraphs);
            }
            set
            {
                if (!String.IsNullOrEmpty(value))
                {
                    Paragraphs = value.Split(
                        new string[] { Environment.NewLine },
                        StringSplitOptions.None);
                    ParseParagraphs();
                }
            }
        }

        #endregion

        #region Constructors

        public LaurisTimePoint() { }

        public LaurisTimePoint(string laurisTest)
            : this()
        {
            _parameterDictionary = null;
            _unitDictionary = null;
            LaurisText = laurisTest;
        }

        public LaurisTimePoint(
            string laurisTest,
            ParameterDictionary parameterDictionary,
            UnitDictionary unitDictionary)
            : this()
        {
            _parameterDictionary = parameterDictionary;
            _unitDictionary = unitDictionary;
            LaurisText = laurisTest;
        }

        #endregion

        #region Private methods

        /// <summary>
        /// Analyzes each Lauris paragraph in this time point, sets the date
        /// and time, and collects LabItem data.
        /// </summary>
        /// <returns>True if the LaurisText has time stamp in the first paragraphs
        /// and contains <see cref="LabItem"/>s in the others.</returns>
        bool ParseParagraphs()
        {
            Items = new ItemDictionary();
            if (Paragraphs.Length > 0)
            {
                if (!ParseTimeStamp()) return false;
                LaurisParagraph lp;
                if (IsValidTimePoint)
                {
                    for (int i = 1; i < Paragraphs.Length; i++)
                    {
                        lp = new LaurisParagraph(
                                Paragraphs[i],
                                _parameterDictionary,
                                _unitDictionary);
                        if (lp.IsLaurisParagraph)
                        {
                            Items.Merge(lp.Items);
                        }
                    }
                }
                IsValidTimePoint = Items.Count > 0;
            }
            return true;
        }

        /// <summary>
        /// Analyzes the date and time information that is expected to be
        /// in the first paragraph.
        /// </summary>
        /// <returns>True if the LaurisText contains a time stamp in the
        /// first paragraph.</returns>
        bool ParseTimeStamp()
        {
            if (Paragraphs.Length == 0)
                throw new InvalidOperationException("The time point has no paragraphs.");

            Match m = _dateStampRegex.Match(Paragraphs[0]);
            bool success = false;
            if (m.Success)
            {
                DateTime dt;
                success = DateTime.TryParseExact(
                    m.Groups["datetime"].Value,
                    "dd.MM.yyyy HH:mm",
                    CultureInfo.InvariantCulture,
                    DateTimeStyles.AllowWhiteSpaces,
                    out dt);
                TimeStamp = dt;
            }
            IsValidTimePoint = success;
            return success;
        }

        void AddItems(IItemDictionary items)
        {

        }

        #endregion

        #region Private fields

        /// <summary>
        /// A regular expression that matches the time stamp in the first
        /// paragraph of a LaurisText.
        /// </summary>
        static readonly Regex _dateStampRegex = new Regex(
            @"^\s*\[?\s*(?<datetime>\d\d\.\d\d\.\d\d\d\d\s+\d\d:\d\d)");
        ParameterDictionary _parameterDictionary;
        UnitDictionary _unitDictionary;

        #endregion
    }
}