/* ItemFormatter.cs
 * part of zaaReloaded2
 * 
 * Copyright 2015-2017 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.Linq;
using System.Text;
using Microsoft.Office.Interop.Word;
using zaaReloaded2.LabModel;
using zaaReloaded2.Controller.Comments;

namespace zaaReloaded2.Formatter
{
    /// <summary>
    /// Wraps a <see cref="LabItem"/> and provides methods to format it.
    /// </summary>
    public class ItemFormatter
    {
        #region Properties

        /// <summary>
        /// Gets or sets the LabItem wrapped by this ItemFormatter.
        /// </summary>
        public LabItem LabItem { get; set; }

        /// <summary>
        /// Gets or sets the ReferenceStyle to use in formatting.
        /// </summary>
        public ReferenceStyle ReferenceStyle { get; set; }

        /// <summary>
        /// Gets or sets the style to use for abnormal values.
        /// </summary>
        public AbnormalStyle AbnormalStyle { get; set; }

        /// <summary>
        /// Gets or sets a flag that indicates whether this ItemFormatter
        /// has been used, i.e. whether the LabItem was written to a
        /// document.
        /// </summary>
        public bool HasBeenUsed { get; set; }

        /// <summary>
        /// Gets or sets a flag that tells the formatter to include or
        /// not include the material indicator in the formatted output.
        /// Default is true.
        /// </summary>
        /// <remarks>
        /// For example, items that are selected with a wildcard may
        /// contain the material info, while expressly chosen items
        /// may not.
        /// </remarks>
        public bool IncludeMaterial { get; set; }

        /// <summary>
        /// Gets whether the Item is marked as blacklisted in the thesaurus.
        /// </summary>
        public bool IsBlacklisted { get { return LabItem.IsBlacklisted;  } }

        /// <summary>
        /// Gets or sets the item's comment.
        /// </summary>
        public ItemComment Comment { get; set; }

        #endregion

        #region Constructor

        /// <summary>
        /// Creates a new ItemFormatter that wraps a <paramref name="labItem"/>.
        /// </summary>
        /// <param name="labItem">LabItem to wrap in this ItemFormatter.</param>
        public ItemFormatter(LabItem labItem,
            ReferenceStyle referenceStyle,
            AbnormalStyle abnormalStyle)
        {
            IncludeMaterial = true;
            LabItem = labItem;
            ReferenceStyle = referenceStyle;
            AbnormalStyle = abnormalStyle;
        }

        #endregion

        #region Methods

        /// <summary>
        /// Formats and writes the LabItem details to a word <paramref name="document"/>.
        /// </summary>
        /// <param name="document">Word document to write to.</param>
        public void WriteToDocument(Formatter formatter)
        {
            string reference;
            if (
                LabItem.HasLimitsOrNormal &&
                (
                    ReferenceStyle == ReferenceStyle.Always ||
                    (ReferenceStyle == ReferenceStyle.IfAbnormal && !LabItem.IsNormal) ||
                    (ReferenceStyle == ReferenceStyle.IfSpecialItem && LabItem.AlwaysPrintLimits) ||
                    (ReferenceStyle == ReferenceStyle.IfSpecialOrAbnormal && 
                        (!LabItem.IsNormal || LabItem.AlwaysPrintLimits))
                )
            )
            {
                string normal;
                if (LabItem.HasLowerLimit && LabItem.HasUpperLimit)
                {
                    normal = String.Format("{0}-{1}", LabItem.LowerLimit, LabItem.UpperLimit);
                }
                else
                {
                    if (LabItem.HasLowerLimit)
                    {
                        normal = String.Format("> {0}", LabItem.LowerLimit);
                    }
                    else if (LabItem.HasUpperLimit)
                    {
                        normal = String.Format("< {0}", LabItem.UpperLimit);
                    }
                    else
                    {
                        normal = LabItem.Normal;
                    }
                }
                reference = String.Format(" ({0})", normal);
            }
            else
            {
                reference = String.Empty;
            }

            string unit;
            if (LabItem.HasUnit)
            {
                string space = LabItem.Unit.StartsWith("/") ? String.Empty : " ";
                unit = String.Format("{0}{1}", space, LabItem.Unit);
            }
            else
            {
                unit = String.Empty;
            }

            string value;
            if (LabItem.IsNumerical)
            {
                // Format the numerical value; this will convert
                // decimal points to commas as needed.
                int precision = LabItem.PreferredPrecision;
                if (precision >= 0)
                {
                    value = LabItem.NumericalValue.ToString("F" + precision);
                }
                else
                {
                    // PreferredPrecision is negative, i.e. use precision as-is
                    value = String.Format("{0}", LabItem.NumericalValue);
                }
            }
            else
            {
                value = LabItem.Value;
            }

            string comment = String.Empty;
            if (Comment != null)
            {
                comment = Comment.BuildComment();
                if (comment != String.Empty) comment = " " + comment;
            }

            string name = IncludeMaterial ? LabItem.QualifiedName : LabItem.Name;


            string output =
                String.Format(
                    "{0} {1}{2}{3}{4}",
                    name,
                    value,
                    unit,
                    reference,
                    comment
                );
            if (!LabItem.IsNormal)
            {
                output = AbnormalStyle.ToMarkup(false) + output + AbnormalStyle.ToMarkup(true);
            }


            formatter.Write(output);
            HasBeenUsed = true;
        }

        #endregion
    }
}