using System.Text;
using SabreTools.Data.Models.MSDOS;
using SabreTools.Text.Extensions;

namespace SabreTools.Wrappers
{
    public partial class MSDOS : IPrintable
    {
#if NETCOREAPP
        /// <inheritdoc/>
        public string ExportJSON() => System.Text.Json.JsonSerializer.Serialize(Model, _jsonSerializerOptions);
#endif

        /// <inheritdoc/>
        public void PrintInformation(StringBuilder builder)
        {
            builder.AppendLine("MS-DOS Executable Information:");
            builder.AppendLine("-------------------------");
            builder.AppendLine();

            Print(builder, Model.Header);
            Print(builder, Model.RelocationTable);
        }

        private static void Print(StringBuilder builder, ExecutableHeader? header)
        {
            builder.AppendLine("  Header Information:");
            builder.AppendLine("  -------------------------");
            if (header is null)
            {
                builder.AppendLine("  No header");
                builder.AppendLine();
                return;
            }

            builder.AppendLine(header.Magic, "  Magic number");
            builder.AppendLine(header.LastPageBytes, "  Last page bytes");
            builder.AppendLine(header.Pages, "  Pages");
            builder.AppendLine(header.RelocationItems, "  Relocation items");
            builder.AppendLine(header.HeaderParagraphSize, "  Header paragraph size");
            builder.AppendLine(header.MinimumExtraParagraphs, "  Minimum extra paragraphs");
            builder.AppendLine(header.MaximumExtraParagraphs, "  Maximum extra paragraphs");
            builder.AppendLine(header.InitialSSValue, "  Initial SS value");
            builder.AppendLine(header.InitialSPValue, "  Initial SP value");
            builder.AppendLine(header.Checksum, "  Checksum");
            builder.AppendLine(header.InitialIPValue, "  Initial IP value");
            builder.AppendLine(header.InitialCSValue, "  Initial CS value");
            builder.AppendLine(header.RelocationTableAddr, "  Relocation table address");
            builder.AppendLine(header.OverlayNumber, "  Overlay number");
            builder.AppendLine();
        }

        private static void Print(StringBuilder builder, RelocationEntry[] entries)
        {
            builder.AppendLine("  Relocation Table Information:");
            builder.AppendLine("  -------------------------");
            if (entries.Length == 0)
            {
                builder.AppendLine("  No relocation table items");
                builder.AppendLine();
                return;
            }

            for (int i = 0; i < entries.Length; i++)
            {
                var entry = entries[i];

                builder.AppendLine($"  Relocation Table Entry {i}");
                builder.AppendLine(entry.Offset, "    Offset");
                builder.AppendLine(entry.Segment, "    Segment");
            }

            builder.AppendLine();
        }
    }
}