using System.IO;
using System.Text;
using SabreTools.Data.Extensions;
using SabreTools.Data.Models.SeparatedValue;
using SabreTools.IO.Extensions;
using SabreTools.Text.SeparatedValue;

#pragma warning disable CA1822 // Mark members as static
namespace SabreTools.Serialization.Writers
{
    public class SeparatedValue : BaseBinaryWriter<MetadataFile>
    {
        #region Constants

        public static readonly string[] HeaderArrayStandard =
        [
            "File Name",
            "Internal Name",
            "Description",
            "Game Name",
            "Game Description",
            "Type",
            "Rom Name",
            "Disk Name",
            "Size",
            "CRC",
            "MD5",
            "SHA1",
            "SHA256",
            "Status",
        ];

        public static readonly string[] HeaderArrayExtended =
        [
            "File Name",
            "Internal Name",
            "Description",
            "Game Name",
            "Game Description",
            "Type",
            "Rom Name",
            "Disk Name",
            "Size",
            "CRC",
            "MD5",
            "SHA1",
            "SHA256",
            "SHA384",
            "SHA512",
            "SpamSum",
            "Status",
        ];

        #endregion

        #region IByteWriter

        /// <inheritdoc/>
        public override byte[]? SerializeArray(MetadataFile? obj)
            => SerializeArray(obj, ',', false);

        /// <inheritdoc/>
        public byte[]? SerializeArray(MetadataFile? obj, char delim, bool longHeader)
        {
            using var stream = SerializeStream(obj, delim, longHeader);
            if (stream is null)
                return null;

            byte[] bytes = new byte[stream.Length];
            int read = stream.Read(bytes, 0, bytes.Length);
            return bytes;
        }

        #endregion

        #region IFileWriter

        /// <inheritdoc/>
        public override bool SerializeFile(MetadataFile? obj, string? path)
            => SerializeFile(obj, path, ',', false);

        /// <inheritdoc/>
        public bool SerializeFile(MetadataFile? obj, string? path, char delim, bool longHeader)
        {
            if (string.IsNullOrEmpty(path))
                return false;

            using var stream = SerializeStream(obj, delim, longHeader);
            if (stream is null)
                return false;

            using var fs = File.Open(path, FileMode.Create, FileAccess.Write, FileShare.None);
            stream.BlockCopy(fs);
            fs.Flush();

            return true;
        }

        #endregion

        #region IStreamWriter

        /// <inheritdoc/>
        public override Stream? SerializeStream(MetadataFile? obj)
            => SerializeStream(obj, ',', false);

        /// <inheritdoc cref="SerializeStream(MetadataFile)"/>
        public Stream? SerializeStream(MetadataFile? obj, char delim, bool longHeader)
        {
            // If the metadata file is null
            if (obj is null)
                return null;

            // Setup the writer and output
            var stream = new MemoryStream();
            var writer = new Writer(stream, Encoding.UTF8)
            {
                Separator = delim,
                Quotes = true
            };

            // Write the header
            WriteHeader(writer, longHeader);

            // Write out the rows, if they exist
            WriteRows(obj.Row, writer, longHeader);

            // Return the stream
            stream.SeekIfPossible(0, SeekOrigin.Begin);
            return stream;
        }

        /// <summary>
        /// Write header information to the current writer
        /// </summary>
        /// <param name="writer">Writer representing the output</param>
        /// <param name="longHeader">True if the long variant of the row should be written, false otherwise</param>
        private static void WriteHeader(Writer writer, bool longHeader)
        {
            string[] headerArray = longHeader ? HeaderArrayExtended : HeaderArrayStandard;
            writer.WriteHeader(headerArray);
            writer.Flush();
        }

        /// <summary>
        /// Write rows information to the current writer
        /// </summary>
        /// <param name="rows">Array of Row objects representing the rows information</param>
        /// <param name="writer">Writer representing the output</param>
        /// <param name="longHeader">True if the long variant of the row should be written, false otherwise</param>
        private static void WriteRows(Row[]? rows, Writer writer, bool longHeader)
        {
            // If the games information is missing, we can't do anything
            if (rows is null || rows.Length == 0)
                return;

            // Loop through and write out the rows
            foreach (var row in rows)
            {
                string?[] rowArray;
                if (longHeader)
                {
                    rowArray =
                    [
                        row.FileName,
                        row.InternalName,
                        row.Description,
                        row.GameName,
                        row.GameDescription,
                        row.Type,
                        row.RomName,
                        row.DiskName,
                        row.Size?.ToString(),
                        row.CRC,
                        row.MD5,
                        row.SHA1,
                        row.SHA256,
                        row.SHA384,
                        row.SHA512,
                        row.SpamSum,
                        row.Status?.AsStringValue(),
                    ];
                }
                else
                {
                    rowArray =
                    [
                        row.FileName,
                        row.InternalName,
                        row.Description,
                        row.GameName,
                        row.GameDescription,
                        row.Type,
                        row.RomName,
                        row.DiskName,
                        row.Size?.ToString(),
                        row.CRC,
                        row.MD5,
                        row.SHA1,
                        row.SHA256,
                        row.Status?.AsStringValue(),
                    ];
                }

                writer.WriteValues(rowArray);
                writer.Flush();
            }
        }

        #endregion
    }
}