/* ClinicTimePoint.cs
 * part of zaaReloaded2
 * 
 * Copyright 2017 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.Thesaurus;
using zaaReloaded2.LabModel;

namespace zaaReloaded2.Importer.ClinicImporter
{
    /// <summary>
    /// Holds all laboratory items for a given time point.
    /// </summary>
    class ClinicTimePoint : TimePoint
    {
        #region Static methods

        /// <summary>
        /// Examines a string and returns true if it resembles
        /// a time stamp line in the clinic output.
        /// </summary>
        /// <param name="line">Line to examine.</param>
        /// <returns>True if line resembles a time stamp line
        /// in the clinic output.</returns>
        static public bool IsTimeStampLine(string line)
        {
            return _timeStampRegex.IsMatch(line);
        }

        /// <summary>
        /// Gets a Regex object that matches a clinic time stamp
        /// line.
        /// </summary>
        static public Regex TimeStampRegex
        {
            get
            {
                return _timeStampRegex;
            }
        }

        #endregion

        #region Properties

        /// <summary>
        /// Gets an array of lines in this ClinicText.
        /// </summary>
        public IList<String> Lines
        {
            [DebuggerStepThrough]
            get
            {
                if (_lines == null)
                {
                    _lines = new List<String>();
                }
                return _lines;
            }
            set
            {
                _lines = value;
                ParseLines();
            }
        }

        /// <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
            {
                return Items.Count > 0;
            }
        }

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

        #endregion

        #region Constructors

        public ClinicTimePoint() { }

        public ClinicTimePoint(
            string clinicText,
            Parameters parameterDictionary,
            Units unitDictionary)
            : this()
        {
            _parameterDictionary = parameterDictionary;
            _unitDictionary = unitDictionary;
            ClinicText = clinicText;
        }

        public ClinicTimePoint(string clinicText)
            : this(clinicText, null, null)
        { }

        public ClinicTimePoint(
            IList<String> lines,
            Parameters parameterDictionary,
            Units unitDictionary)
            : this(parameterDictionary, unitDictionary)
        {
            Lines = lines;
        }

        public ClinicTimePoint(IList<String> lines)
            : this(lines, null, null)
        {
        }

        public ClinicTimePoint(
                Parameters parameterDictionary,
                Units unitDictionary)
            : this()
        {
            _parameterDictionary = parameterDictionary;
            _unitDictionary = unitDictionary;
        }

        #endregion

        #region Public methods

        /// <summary>
        /// Adds a new line to this time point by parsing
        /// the line for a laboratory item.
        /// </summary>
        /// <param name="paragraph">Line to add.</param>
        public override void Parse(string paragraph)
        {
            Lines.Add(paragraph);
            ParseLine(paragraph);
        }

        #endregion

        #region Private methods

        /// <summary>
        /// Analyzes each clinic line in this time point, sets the date
        /// and time, and collects LabItem data.
        /// </summary>
        void ParseLines()
        {
            if (Lines != null)
            {
                foreach (string paragraph in Lines)
                {
                    ParseLine(paragraph);
                }
            }
        }

        void ParseLine(string line)
        {
            Match m = _timeStampRegex.Match(line);
            if (m.Success)
            {
                Logger.Info("ParseLine: Matches time stamp");
                DateTime dt;
                if (DateTime.TryParseExact(
                    m.Groups["datetime"].Value,
                    "dd.MM.yyyy HH:mm",
                    CultureInfo.InvariantCulture,
                    DateTimeStyles.AllowWhiteSpaces,
                    out dt))
                {
                    TimeStamp = dt;
                }
            }
            else
            {
                Logger.Info("ParseLine: Not a time stamp");
                ClinicLine clinicLine = new ClinicLine(
                        line,
                        _parameterDictionary,
                        _unitDictionary);
                if (clinicLine.IsClinicLine)
                {
                    Logger.Debug("ParseParagraph: Merging Lauris paragraph");
                    Items[clinicLine.Item.QualifiedName] = clinicLine.Item;
                }
            }
        }

        void AddItems(IItemDictionary items)
        {
            Items.Merge(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 _timeStampRegex = new Regex(
            @"^(Labor:?)?\s*\(?\s*(?<datetime>\d\d\.\d\d\.\d\d\d\d\s+\d\d:\d\d)(:00)?\)");
        IList<String> _lines;
        Parameters _parameterDictionary;
        Units _unitDictionary;

        #endregion

        #region Class logger

        private static NLog.Logger Logger { get { return _logger.Value; } }

        private static readonly Lazy<NLog.Logger> _logger = new Lazy<NLog.Logger>(() => NLog.LogManager.GetCurrentClassLogger());

        #endregion
    }
}