using System.Text;
using System.Text.Json;
using View_by_Distance.Shared.Models;
using View_by_Distance.Shared.Models.Stateless.Methods;

namespace View_by_Distance.PhotoPrism.Models;

public class F_PhotoPrism
{

    private static JsonProperty[] GetJsonProperty(string fileName)
    {
        JsonProperty[] results;
        if (!File.Exists(fileName))
            results = Array.Empty<JsonProperty>();
        else
        {
            string json = File.ReadAllText(fileName);
            JsonElement? jsonElement = JsonSerializer.Deserialize<JsonElement>(json);
            results = jsonElement.Value.EnumerateObject().ToArray();
        }
        return results;
    }

    private static Marker[]? GetMarkers(string fPhotoPrismSingletonDirectory)
    {
        Marker[]? results;
        string file = Path.Combine(fPhotoPrismSingletonDirectory, "markers.json");
        JsonProperty[] jsonProperties = GetJsonProperty(file);
        if (!jsonProperties.Any())
            results = null;
        else
            results = JsonSerializer.Deserialize<Marker[]>(jsonProperties[1].Value);
        return results;
    }

    private static Dictionary<string, List<Marker>> GetFileUIdToMarkers(string fPhotoPrismSingletonDirectory)
    {
        Dictionary<string, List<Marker>> results = new();
        Marker[]? markers = GetMarkers(fPhotoPrismSingletonDirectory);
        if (markers is null)
            throw new NullReferenceException(nameof(markers));
        foreach (Marker marker in markers)
        {
            if (!results.ContainsKey(marker.FileUid))
                results.Add(marker.FileUid, new());
            results[marker.FileUid].Add(marker);
        }
        return results;
    }

    private static DatabaseFile[]? GetDatabaseFiles(string fPhotoPrismSingletonDirectory)
    {
        DatabaseFile[]? results;
        string file = Path.Combine(fPhotoPrismSingletonDirectory, "files.json");
        JsonProperty[] jsonProperties = GetJsonProperty(file);
        if (!jsonProperties.Any())
            results = null;
        else
            results = JsonSerializer.Deserialize<DatabaseFile[]>(jsonProperties[1].Value);
        return results;
    }

    public static Dictionary<string, List<MappingFromPhotoPrism>> GetFileNameToCollection(string fPhotoPrismSingletonDirectory)
    {
        Dictionary<string, List<MappingFromPhotoPrism>> results = new();
        List<Marker>? makers;
        MappingFromPhotoPrism mappingFromPhotoPrism;
        List<MappingFromPhotoPrism>? mappingFromPhotoPrismCollection;
        DatabaseFile[]? databaseFiles = GetDatabaseFiles(fPhotoPrismSingletonDirectory);
        if (databaseFiles is null)
            throw new NullReferenceException(nameof(databaseFiles));
        Dictionary<string, List<Marker>> fileUIdToMarkers = GetFileUIdToMarkers(fPhotoPrismSingletonDirectory);
        foreach (DatabaseFile databaseFile in databaseFiles)
        {
            if (!results.TryGetValue(databaseFile.FileName, out mappingFromPhotoPrismCollection))
            {
                results.Add(databaseFile.FileName, new());
                if (!results.TryGetValue(databaseFile.FileName, out mappingFromPhotoPrismCollection))
                    throw new Exception();
            }
            if (!fileUIdToMarkers.TryGetValue(databaseFile.FileUid, out makers))
                mappingFromPhotoPrism = new(databaseFile, new());
            else
                mappingFromPhotoPrism = new(databaseFile, makers);
            mappingFromPhotoPrismCollection.Add(mappingFromPhotoPrism);
        }
        return results;
    }

    public static void WriteMatches(string fPhotoPrismContentDirectory, string personBirthdayFormat, long ticks, List<Face> distinctFilteredFaces, Shared.Models.Methods.IMapLogic mapLogic)
    {
        long? personKey;
        const int zero = 0;
        int? normalizedRectangle;
        string personKeyFormatted;
        List<string> subjects = new();
        PersonBirthday personBirthday;
        string personDisplayDirectoryName;
        StringBuilder stringBuilder = new();
        PersonContainer[]? personContainers;
        System.Drawing.Rectangle dlibRectangle;
        System.Drawing.Rectangle? prismRectangle;
        System.Drawing.Rectangle intersectRectangle;
        Dictionary<int, PersonContainer[]>? normalizedRectangleToPersonContainers;
        (MappingFromPhotoPrism MappingFromPhotoPrism, Marker Marker, double Percent)[] sortedCollection;
        List<(MappingFromPhotoPrism MappingFromPhotoPrism, Marker Marker, double Percent)> collection = new();
        foreach (Face face in distinctFilteredFaces)
        {
            collection.Clear();
            normalizedRectangle = face.Mapping?.MappingFromLocation.NormalizedRectangle;
            if (normalizedRectangle is null)
                continue;
            if (face.FaceEncoding is null || face.Location is null || face.OutputResolution is null || face.Mapping is null)
                continue;
            if (face.Mapping.MappingFromPhotoPrismCollection is null)
                continue;
            (_, normalizedRectangleToPersonContainers) = mapLogic.GetNormalizedRectangleToPersonContainers(face.Mapping.MappingFromItem.Id);
            if (normalizedRectangleToPersonContainers is null || !normalizedRectangleToPersonContainers.TryGetValue(normalizedRectangle.Value, out personContainers))
                continue;
            dlibRectangle = new(face.Location.Left, face.Location.Top, face.Location.Right - face.Location.Left, face.Location.Bottom - face.Location.Top);
            foreach (MappingFromPhotoPrism mappingFromPhotoPrism in face.Mapping.MappingFromPhotoPrismCollection)
            {
                foreach (Marker marker in mappingFromPhotoPrism.Markers)
                {
                    prismRectangle = ILocation.GetRectangle(face.OutputResolution, mappingFromPhotoPrism.DatabaseFile, marker);
                    if (prismRectangle is null)
                        continue;
                    intersectRectangle = System.Drawing.Rectangle.Intersect(dlibRectangle, prismRectangle.Value);
                    if (intersectRectangle.Width == 0 || intersectRectangle.Height == 0)
                        continue;
                    double percent = (double)intersectRectangle.Width * intersectRectangle.Height / (dlibRectangle.Width * dlibRectangle.Height);
                    if (percent < 0.000001)
                        continue;
                    collection.Add(new(mappingFromPhotoPrism, marker, percent));
                }
            }
            if (!collection.Any())
                continue;
            sortedCollection = collection.OrderByDescending(l => l.Percent).ToArray();
            foreach ((MappingFromPhotoPrism mappingFromPhotoPrism, Marker marker, double percent) in sortedCollection)
            {
                foreach (PersonContainer personContainer in personContainers)
                {
                    if (personContainer.Key is null || personContainer.Birthdays is null || !personContainer.Birthdays.Any())
                        continue;
                    personBirthday = personContainer.Birthdays[zero];
                    personKey = personBirthday.Value.Ticks;
                    personDisplayDirectoryName = personContainer.DisplayDirectoryName;
                    personKeyFormatted = IPersonBirthday.GetFormatted(personBirthdayFormat, personBirthday);
                    subjects.Add($"update `subjects` set subj_alias = '{personKeyFormatted}' where subj_name = '{personDisplayDirectoryName}';");
                    _ = stringBuilder.
                        Append("update `markers` set subj_src = 'manual', marker_name = '").
                        Append(personDisplayDirectoryName).
                        Append("' where marker_uid = '").
                        Append(marker.MarkerUid).
                        AppendLine("';");
                }
            }
        }
        File.WriteAllLines(Path.Combine(fPhotoPrismContentDirectory, $"{ticks}-subject_alias_update.sql"), subjects.Distinct());
        File.WriteAllText(Path.Combine(fPhotoPrismContentDirectory, $"{ticks}-marker_name_update.sql"), stringBuilder.ToString());
    }

}