using System;
using System.Collections.Generic;
using SabreTools.Core;
using SabreTools.DatItems;
using SabreTools.DatItems.Formats;

namespace SabreTools.DatFiles.Formats
{
    /// <summary>
    /// Represents a value-separated DAT
    /// </summary>
    internal abstract class SeparatedValue : SerializableDatFile<Models.SeparatedValue.MetadataFile, Serialization.Files.SeparatedValue, Serialization.CrossModel.SeparatedValue>
    {
        // Private instance variables specific to Hashfile DATs
        protected char _delim;

        /// <summary>
        /// Constructor designed for casting a base DatFile
        /// </summary>
        /// <param name="datFile">Parent DatFile to copy from</param>
        public SeparatedValue(DatFile? datFile)
            : base(datFile)
        {
        }

        /// <inheritdoc/>
        public override void ParseFile(string filename, int indexId, bool keep, bool statsOnly = false, bool throwOnError = false)
        {
            try
            {
                // Deserialize the input file
                var metadataFile = new Serialization.Files.SeparatedValue().Deserialize(filename, _delim);
                var metadata = new Serialization.CrossModel.SeparatedValue().Serialize(metadataFile);

                // Convert to the internal format
                ConvertMetadata(metadata, filename, indexId, keep, statsOnly);
            }
            catch (Exception ex) when (!throwOnError)
            {
                string message = $"'{filename}' - An error occurred during parsing";
                logger.Error(ex, message);
            }
        }

        /// <inheritdoc/>
        protected override ItemType[] GetSupportedTypes()
        {
            return
            [
                ItemType.Disk,
                ItemType.Media,
                ItemType.Rom
            ];
        }

        /// <inheritdoc/>
        protected override List<string>? GetMissingRequiredFields(DatItem datItem)
        {
            var missingFields = new List<string>();

            // Check item name
            if (string.IsNullOrEmpty(datItem.GetName()))
                missingFields.Add(Models.Metadata.Rom.NameKey);

            switch (datItem)
            {
                case Disk disk:
                    if (string.IsNullOrEmpty(disk.GetStringFieldValue(Models.Metadata.Disk.MD5Key))
                        && string.IsNullOrEmpty(disk.GetStringFieldValue(Models.Metadata.Disk.SHA1Key)))
                    {
                        missingFields.Add(Models.Metadata.Disk.SHA1Key);
                    }
                    break;

                case Rom rom:
                    if (rom.GetInt64FieldValue(Models.Metadata.Rom.SizeKey) == null || rom.GetInt64FieldValue(Models.Metadata.Rom.SizeKey) < 0)
                        missingFields.Add(Models.Metadata.Rom.SizeKey);
                    if (string.IsNullOrEmpty(rom.GetStringFieldValue(Models.Metadata.Rom.CRCKey))
                        && string.IsNullOrEmpty(rom.GetStringFieldValue(Models.Metadata.Rom.MD5Key))
                        && string.IsNullOrEmpty(rom.GetStringFieldValue(Models.Metadata.Rom.SHA1Key))
                        && string.IsNullOrEmpty(rom.GetStringFieldValue(Models.Metadata.Rom.SHA256Key))
                        && string.IsNullOrEmpty(rom.GetStringFieldValue(Models.Metadata.Rom.SHA384Key))
                        && string.IsNullOrEmpty(rom.GetStringFieldValue(Models.Metadata.Rom.SHA512Key))
                        && string.IsNullOrEmpty(rom.GetStringFieldValue(Models.Metadata.Rom.SpamSumKey)))
                    {
                        missingFields.Add(Models.Metadata.Rom.SHA1Key);
                    }
                    break;
            }

            return missingFields;
        }

        /// <inheritdoc/>
        public override bool WriteToFile(string outfile, bool ignoreblanks = false, bool throwOnError = false)
        {
            try
            {
                logger.User($"Writing to '{outfile}'...");

                // Serialize the input file
                var metadata = ConvertMetadata(ignoreblanks);
                var metadataFile = new Serialization.CrossModel.SeparatedValue().Deserialize(metadata);
                if (!(new Serialization.Files.SeparatedValue().Serialize(metadataFile, outfile, _delim)))
                {
                    logger.Warning($"File '{outfile}' could not be written! See the log for more details.");
                    return false;
                }
            }
            catch (Exception ex) when (!throwOnError)
            {
                logger.Error(ex);
                return false;
            }

            logger.User($"'{outfile}' written!{Environment.NewLine}");
            return true;
        }
    }

    /// <summary>
    /// Represents a comma-separated value file
    /// </summary>
    internal sealed class CommaSeparatedValue : SeparatedValue
    {
        /// <summary>
        /// Constructor designed for casting a base DatFile
        /// </summary>
        /// <param name="datFile">Parent DatFile to copy from</param>
        public CommaSeparatedValue(DatFile? datFile)
            : base(datFile)
        {
            _delim = ',';
        }
    }

    /// <summary>
    /// Represents a semicolon-separated value file
    /// </summary>
    internal sealed class SemicolonSeparatedValue : SeparatedValue
    {
        /// <summary>
        /// Constructor designed for casting a base DatFile
        /// </summary>
        /// <param name="datFile">Parent DatFile to copy from</param>
        public SemicolonSeparatedValue(DatFile? datFile)
            : base(datFile)
        {
            _delim = ';';
        }
    }

    /// <summary>
    /// Represents a tab-separated value file
    /// </summary>
    internal sealed class TabSeparatedValue : SeparatedValue
    {
        /// <summary>
        /// Constructor designed for casting a base DatFile
        /// </summary>
        /// <param name="datFile">Parent DatFile to copy from</param>
        public TabSeparatedValue(DatFile? datFile)
            : base(datFile)
        {
            _delim = '\t';
        }
    }
}