using System.Collections.Generic;

using SabreTools.Core;
using SabreTools.Core.Tools;
using SabreTools.Logging;

namespace SabreTools.Filtering
{
    /// <summary>
    /// Represents the filtering operations that need to be performed on a DatHeader
    /// </summary>
    /// TODO: Investigate how to reduce the amount of hardcoded filter statements
    /// TODO: Add DatHeader filters
    public class DatHeaderFilter
    {
        #region Logging

        /// <summary>
        /// Logging object
        /// </summary>
        private readonly Logger logger;

        #endregion

        #region Constructors

        /// <summary>
        /// Constructor
        /// </summary>
        public DatHeaderFilter()
        {
            logger = new Logger(this);
        }

        #endregion

        #region Filter Population

        /// <summary>
        /// Populate the filters object using a set of key:value filters
        /// </summary>
        /// <param name="filters">List of key:value where ~key/!key is negated</param>
        public void PopulateFromList(List<string> filters)
        {
            foreach (string filterPair in filters)
            {
                // If we don't even have a possible filter pair
                if (!filterPair.Contains(":"))
                {
                    logger.Warning($"'{filterPair}` is not a valid filter string. Valid filter strings are of the form 'key:value'. Please refer to README.1ST or the help feature for more details.");
                    continue;
                }

                string filterPairTrimmed = filterPair.Trim('"', ' ', '\t');
                bool negate = filterPairTrimmed.StartsWith("!")
                    || filterPairTrimmed.StartsWith("~")
                    || filterPairTrimmed.StartsWith("not-");
                filterPairTrimmed = filterPairTrimmed.TrimStart('!', '~');
                filterPairTrimmed = filterPairTrimmed.StartsWith("not-") ? filterPairTrimmed.Substring(4) : filterPairTrimmed;

                string filterFieldString = filterPairTrimmed.Split(':')[0].ToLowerInvariant().Trim('"', ' ', '\t');
                string filterValue = filterPairTrimmed.Substring(filterFieldString.Length + 1).Trim('"', ' ', '\t');

                DatHeaderField filterField = filterFieldString.AsDatHeaderField();
                SetFilter(filterField, filterValue, negate);
            }
        }

        /// <summary>
        /// Set multiple filters from key
        /// </summary>
        /// <param name="key">Key for the filter to be set</param>
        /// <param name="values">List of values for the filter</param>
        /// <param name="negate">True if negative filter, false otherwise</param>
        public void SetFilter(DatHeaderField key, List<string> values, bool negate)
        {
            foreach (string value in values)
            {
                SetFilter(key, value, negate);
            }
        }

        /// <summary>
        /// Set a single filter from key
        /// </summary>
        /// <param name="key">Key for the filter to be set</param>
        /// <param name="value">Value of the filter</param>
        /// <param name="negate">True if negative filter, false otherwise</param>
        public void SetFilter(DatHeaderField key, string value, bool negate)
        {
            switch (key)
            {
                // TODO: Add DatHeader filters
            }
        }

        #endregion
    }
}