namespace View_by_Distance.Shared.Models.Stateless.Methods;

internal abstract class Mapping
{

    private static void IfNotAlreadyFileMove(string file, int idValue, int normalizedPixelPercentageValue, string extensionLowered)
    {
        string? directoryName = Path.GetDirectoryName(file);
        if (string.IsNullOrEmpty(directoryName))
            throw new Exception();
        string checkFile = Path.Combine(directoryName, $"{IMapping.GetDeterministicHashCodeKey(idValue, normalizedPixelPercentageValue)}{extensionLowered}");
        if (!File.Exists(checkFile))
            File.Move(file, checkFile);
    }

    private static (int?, int?, List<Models.Face>?) GetReversedDeterministicHashCodeKeysFromSegments(int locationDigits, bool keyValuePairsAny, Dictionary<int, List<Models.Face>> keyValuePairs, string file, string[] segments)
    {
        int? id;
        List<Models.Face>? faces;
        int? normalizedPixelPercentage;
        if (segments.Length != 3)
        {
            id = null;
            faces = null;
            normalizedPixelPercentage = null;
        }
        else if (!int.TryParse(segments[0], out int idValue) || !int.TryParse(ILocation.GetRightPadded(locationDigits, segments[1]), out int normalizedPixelPercentageValue))
        {
            id = null;
            faces = null;
            normalizedPixelPercentage = null;
        }
        else
        {
            id = idValue;
            string extensionLowered = $".{segments[2]}";
            normalizedPixelPercentage = normalizedPixelPercentageValue;
            if (segments[1].Length != locationDigits)
                IfNotAlreadyFileMove(file, idValue, normalizedPixelPercentageValue, extensionLowered);
            if (!keyValuePairsAny || !keyValuePairs.ContainsKey(idValue))
                faces = null;
            else
                faces = keyValuePairs[idValue];
        }
        return new(id, normalizedPixelPercentage, faces);
    }

    internal static (int?, int?, List<Models.Face>?) GetReversedDeterministicHashCodeKey(int locationDigits, bool keyValuePairsAny, Dictionary<int, List<Models.Face>> keyValuePairs, string file)
    {
        int? id;
        List<Models.Face>? faces;
        int? normalizedPixelPercentage;
        string fileName = Path.GetFileName(file);
        if (fileName.Length < 2 || fileName[1..].Contains('-'))
        {
            id = null;
            faces = null;
            normalizedPixelPercentage = null;
        }
        else
        {
            string[] segments = fileName.Split('.');
            (id, normalizedPixelPercentage, faces) = GetReversedDeterministicHashCodeKeysFromSegments(locationDigits, keyValuePairsAny, keyValuePairs, file, segments);
        }
        return new(id, normalizedPixelPercentage, faces);
    }

}