using System.Text;
using SessionZero.SzfLib.File;
using SessionZero.SzfLib.Objects;
using SessionZero.SzfLib.Parser;

namespace SessionZero.SzfLib.Generator;

public class SzfGenerator : ISzfGenerator
{

    private StringBuilder? _builder;


    public SzfFile GenerateSzfFile(SzfObject szfObj)
    {
        _builder = new();

        _builder.AppendLine($"!type: {szfObj.SzfType}");
        _builder.AppendLine($"!schema: {szfObj.SzfVersion}");

        _builder.AppendLine();

        foreach (var section in szfObj.Sections)
        {
            WriteSection(section);
        }

        SzfFile szfFile = new()
        {
            SzfType = szfObj.SzfType,
            Schema = szfObj.SzfVersion,
            Name = szfObj.GetMetadataField("Name"),
            Guid = szfObj.GetMetadataField("Guid"),
            Version = szfObj.GetMetadataField("Version"),
            Content = _builder.ToString()
        };

        return szfFile;
    }

    private void WriteSection(SzfSection section, string parentPath = "")
    {
        var sectionName = string.IsNullOrEmpty(parentPath) ? section.Name : $"{parentPath}.{section.Name}";
        _builder?.AppendLine($"[{sectionName}]");

        foreach (var field in section.Fields)
        {
            _builder?.AppendLine($"{field.Key} ({field.Value.SzfType}) = {field.Value.Value}");
        }

        _builder?.AppendLine();

        foreach (var subsection in section.Subsections.Values)
        {
            WriteSection(subsection, sectionName);
        }
    }

}