using MetadataExtractor;
using System.Collections.ObjectModel;
using System.Text.Json;
using View_by_Distance.Metadata.Models.Stateless;
using View_by_Distance.Metadata.Models.Stateless.Methods;
using View_by_Distance.Shared.Models;
using View_by_Distance.Shared.Models.Stateless.Methods;

namespace View_by_Distance.Metadata.Models;

public class A_Metadata
{

    private readonly MetadataConfiguration _MetadataConfiguration;
    private readonly ReadOnlyDictionary<int, ReadOnlyDictionary<string, string[]>> _FileGroups;

    public A_Metadata(MetadataConfiguration metadataConfiguration)
    {
        _MetadataConfiguration = metadataConfiguration;
        string bResultsFullGroupDirectory = IResult.GetResultsFullGroupDirectory(metadataConfiguration.ResultConfiguration,
                                                                                 nameof(A_Metadata),
                                                                                 string.Empty,
                                                                                 includeResizeGroup: false,
                                                                                 includeModel: false,
                                                                                 includePredictorModel: false);
        _FileGroups = IPath.GetKeyValuePairs(metadataConfiguration.ResultConfiguration, bResultsFullGroupDirectory, [metadataConfiguration.ResultConfiguration.ResultSingleton]);
    }

    private FileInfo GetFileInfo(ResultConfiguration resultConfiguration, FilePath filePath)
    {
        FileInfo result;
        FileInfo fileInfo = new(filePath.FullName);
        (_, int directoryIndex) = IPath.GetDirectoryNameAndIndex(resultConfiguration, filePath);
        DateTime minimumDateTime = fileInfo.CreationTime < fileInfo.LastWriteTime ? fileInfo.CreationTime : fileInfo.LastWriteTime;
        int minimumYear = minimumDateTime.Year < resultConfiguration.EpicYear ? resultConfiguration.EpicYear : minimumDateTime.Year;
        result = new(Path.Combine(_FileGroups[minimumYear][_MetadataConfiguration.ResultConfiguration.ResultSingleton][directoryIndex], $"{filePath.NameWithoutExtension}{filePath.ExtensionLowered}.json"));
        return result;
    }

    public (FileInfo, ExifDirectory) GetMetadataCollection(MetadataConfiguration metadataConfiguration, FilePath filePath, DeterministicHashCode deterministicHashCode)
    {
        ExifDirectory? results;
        FileInfo fileInfo = GetFileInfo(metadataConfiguration.ResultConfiguration, filePath);
        if (_MetadataConfiguration.ForceMetadataLastWriteTimeToCreationTime && !fileInfo.Exists && File.Exists(Path.ChangeExtension(fileInfo.FullName, ".delete")))
        {
            File.Move(Path.ChangeExtension(fileInfo.FullName, ".delete"), fileInfo.FullName);
            fileInfo.Refresh();
        }
        if (_MetadataConfiguration.ForceMetadataLastWriteTimeToCreationTime && fileInfo.Exists && fileInfo.LastWriteTime != fileInfo.CreationTime)
        {
            File.SetLastWriteTime(fileInfo.FullName, fileInfo.CreationTime);
            fileInfo.Refresh();
        }
        if (_MetadataConfiguration.PropertiesChangedForMetadata)
            results = null;
        else if (!fileInfo.Exists)
            results = null;
        else if (!fileInfo.FullName.EndsWith(".json") && !fileInfo.FullName.EndsWith(".old"))
            throw new ArgumentException("must be a *.json file");
        else
        {
            string json = File.ReadAllText(fileInfo.FullName);
            try
            {
                results = JsonSerializer.Deserialize(json, ExifDirectorySourceGenerationContext.Default.ExifDirectory);
                if (results is null)
                    throw new Exception();
            }
            catch (Exception)
            {
                results = null;
            }
        }
        if (results is null)
        {
            System.Drawing.Size? size;
            try
            { size = Dimensions.GetDimensions(filePath.FullName); }
            catch (Exception) { size = null; }
            IReadOnlyList<MetadataExtractor.Directory> directories = ImageMetadataReader.ReadMetadata(filePath.FullName);
            results = Exif.Covert(filePath, deterministicHashCode, size, directories);
            string json = JsonSerializer.Serialize(results, ExifDirectorySourceGenerationContext.Default.ExifDirectory);
            if (IPath.WriteAllText(fileInfo.FullName, json, updateDateWhenMatches: false, compareBeforeWrite: true, updateToWhenMatches: null) && _MetadataConfiguration.ForceMetadataLastWriteTimeToCreationTime)
            {
                File.SetLastWriteTime(fileInfo.FullName, fileInfo.CreationTime);
                fileInfo.Refresh();
            }
        }
        return (fileInfo, results);
    }

    public static Action<string> SetExifDirectoryCollection(IRename rename, MetadataConfiguration metadataConfiguration, A_Metadata metadata, List<(string, FileInfo, ExifDirectory)> exifDirectories, Action tick)
    {
        return file =>
        {
            tick.Invoke();
            FileInfo fileInfo;
            FilePath? ffmpegFilePath;
            ExifDirectory exifDirectory;
            ReadOnlyCollection<string> ffmpegFiles;
            DeterministicHashCode deterministicHashCode;
            FilePath filePath = IId.GetFilePath(metadataConfiguration, file);
            if (filePath.ExtensionLowered is not ".paddedId" and not ".lsv")
            {
                if (filePath.Id is null || (!filePath.IsIdFormat && !filePath.IsPaddedIdFormat))
                {
                    (ffmpegFiles, ffmpegFilePath) = rename.ConvertAndGetFfmpegFiles(filePath);
                    if (ffmpegFilePath is not null)
                        filePath = ffmpegFilePath;
                    deterministicHashCode = filePath.Id is not null ? deterministicHashCode = new(null, filePath.Id, null) : deterministicHashCode = rename.GetDeterministicHashCode(filePath);
                    (fileInfo, exifDirectory) = metadata.GetMetadataCollection(metadataConfiguration, filePath, deterministicHashCode);
                    lock (exifDirectories)
                        exifDirectories.Add(new(file, fileInfo, exifDirectory));
                    foreach (string ffmpegFile in ffmpegFiles)
                        File.Delete(ffmpegFile);
                }
            }
        };
    }

}