/* ClinicLine.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.Collections.ObjectModel;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using zaaReloaded2.Thesaurus;
using zaaReloaded2.LabModel;
using zaaReloaded2.Importer.ZaaImporter;
using Bovender.Extensions;

namespace zaaReloaded2.Importer.ClinicImporter
{
    /// <summary>
    /// Parses a line in a lab section produced by the outpatients clinic system,
    /// and creates a list of <see cref="zaaReloaded2.Importer.BaseImporter.LabItem"/>s.
    /// </summary>
    public class ClinicLine
    {
        #region Static methods

        /// <summary>
        /// Investigates a paragraph and determines whether it looks
        /// like a clinic laboratory items line.
        /// </summary>
        public static bool ResemblesClinicLine(string line)
        {
            return _expectedFormat.IsMatch(line);
        }

        #endregion

        #region Public properties

        public LaurisItem Item { get; private set; }

        /// <summary>
        /// Gets the original line that this object was constructed from.
        /// </summary>
        public string OriginalLine{ get; private set; }

        /// <summary>
        /// Is true if the <see cref="OriginalLine"/> matches the expected
        /// format and contains <see cref="LabItem"/>s.
        /// </summary>
        public bool IsClinicLine{ get; private set; }

        #endregion

        #region Constructor

        public ClinicLine(string line)
        {
            OriginalLine = line;
            Parse();
        }

        /// <summary>
        /// Constructs a <see cref="ClinicLine"/> object from a given line,
        /// using a <paramref name="parameterDictionary"/> and a
        /// <paramref name="unitDictionary"/> to translate the individual
        /// items' properties.
        /// </summary>
        /// <param name="line">line to parse.</param>
        /// <param name="parameterDictionary">ParameterDictionary that contains
        /// canonical names and material types.</param>
        /// <param name="unitDictionary">Unit dictionary that contains canonical
        /// unit names.</param>
        public ClinicLine(string line,
            Thesaurus.Parameters parameterDictionary,
            Thesaurus.Units unitDictionary)
        {
            OriginalLine = line;
            _parameterDictionary = parameterDictionary;
            _unitDictionary = unitDictionary;
            Parse();
        }

        #endregion

        #region Private methods

        /// <summary>
        /// Attempts to parse a line.
        /// </summary>
        void Parse()
        {
            Logger.Info("Parse: \"{0}\"", OriginalLine.TruncateWithEllipsis(40).Replace("\t", " "));
            Match m = _expectedFormat.Match(OriginalLine);
            if (m.Success)
            {
                Logger.Info("Parse: Matches clinic line format");
                Item = new LaurisItem(m.Groups["item"].Value, _parameterDictionary, _unitDictionary);
                IsClinicLine = true;
            }
            else
            {
                Logger.Info("Parse: Does not match clinic line format");
                IsClinicLine = false;
            }
        }

        #endregion

        #region Fields

        static readonly Regex _expectedFormat = new Regex(@"\t(?<item>[^:]+:(\t[^\t]+){3})");
        Thesaurus.Parameters _parameterDictionary;
        Thesaurus.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
    }
}