using System.Text.Json;

namespace View_by_Distance.Instance.Models;

/// <summary>
// List<string>
/// </summary>
internal class F_Random
{

    private readonly Serilog.ILogger? _Log;
    private readonly Configuration _Configuration;
    private readonly JsonSerializerOptions _WriteIndentedJsonSerializerOptions;

    internal F_Random(Configuration configuration)
    {
        _Configuration = configuration;
        _Log = Serilog.Log.ForContext<F_Random>();
        _WriteIndentedJsonSerializerOptions = new JsonSerializerOptions { WriteIndented = false };
    }

    public override string ToString()
    {
        string result = JsonSerializer.Serialize(this, new JsonSerializerOptions() { WriteIndented = true });
        return result;
    }

    private bool IsIgnoreRelativePath(string directory)
    {
        bool result = false;
        string? checkDirectory = Path.GetFullPath(directory);
        for (int i = 0; i < int.MaxValue; i++)
        {
            if (_Configuration.IgnoreRelativePaths.Contains(Path.GetFileName(checkDirectory)))
            {
                result = true;
                break;
            }
            checkDirectory = Path.GetDirectoryName(checkDirectory);
            if (string.IsNullOrEmpty(checkDirectory) || checkDirectory == _Configuration.PropertyConfiguration.RootDirectory)
                break;
        }
        return result;
    }

    private static Dictionary<string, List<string>> Get(Dictionary<long, List<int>> personKeyToIds, Shared.Models.Mapping[] mappingCollection, string dateFormat)
    {
        Dictionary<string, List<string>> results = new();
        string key;
        long personKey;
        DateTime dateTime;
        List<long>? personKeys;
        List<string>? relativePaths;
        Dictionary<int, List<long>> idToPersonKeys = Map.Models.Stateless.Methods.IMapLogic.GetIdToPersonKeys(personKeyToIds);
        foreach (Shared.Models.Mapping mapping in mappingCollection)
        {
            if (mapping.MappingFromItem.ImageFileHolder.DirectoryName is null || mapping.MappingFromPerson is null)
                continue;
            if (!idToPersonKeys.TryGetValue(mapping.MappingFromItem.Id, out personKeys))
                continue;
            if (!personKeys.Contains(mapping.MappingFromPerson.PersonBirthday.Value.Ticks))
                continue;
            personKey = mapping.MappingFromPerson.PersonBirthday.Value.Ticks;
            dateTime = new(personKey);
            key = dateTime.ToString(dateFormat);
            if (!results.TryGetValue(key, out relativePaths))
            {
                results.Add(key, new());
                if (!results.TryGetValue(key, out relativePaths))
                    throw new Exception();
            }
            relativePaths.Add(mapping.MappingFromItem.RelativePath);
        }
        return results;
    }

    internal void Random(Property.Models.Configuration configuration, string outputResolution, Dictionary<long, List<int>> personKeyToIds, Shared.Models.Mapping[] mappingCollection)
    {
        string key;
        string json;
        string jsonFile;
        Random random = new();
        List<string>? collection;
        string dateFormat = "MM-dd";
        List<string> relativePaths = new();
        DateTime dateTime = new(2024, 1, 1); //Leap year
        Dictionary<string, List<string>> dayToRelativePaths = Get(personKeyToIds, mappingCollection, dateFormat);
        string fRandomCollectionDirectory = Property.Models.Stateless.IResult.GetResultsDateGroupDirectory(configuration, nameof(F_Random), "[]");
        string[] files = Directory.GetFiles(fRandomCollectionDirectory, "*", SearchOption.TopDirectoryOnly);
        foreach (string file in files)
            File.Delete(file);
        foreach (Shared.Models.Mapping mapping in mappingCollection)
        {
            if (mapping.MappingFromItem.ImageFileHolder.DirectoryName is null)
                continue;
            if (_Configuration.IgnoreRelativePaths.Any(l => mapping.MappingFromItem.ImageFileHolder.DirectoryName.Contains(l)) && IsIgnoreRelativePath(mapping.MappingFromItem.ImageFileHolder.DirectoryName))
                continue;
            relativePaths.Add(mapping.MappingFromItem.RelativePath);
        }
        if (relativePaths.Any())
        {
            for (int i = 0; i < 366; i++)
            {
                key = dateTime.AddDays(i).ToString(dateFormat);
                if (dayToRelativePaths.TryGetValue(key, out collection) && collection.Count > 10)
                    collection = (from l in collection orderby random.NextDouble() select l).ToList();
                else
                    collection = (from l in relativePaths orderby random.NextDouble() select l).ToList();
                jsonFile = Path.Combine(fRandomCollectionDirectory, $"{key}.json");
                json = JsonSerializer.Serialize(collection, _WriteIndentedJsonSerializerOptions);
                _ = Shared.Models.Stateless.Methods.IPath.WriteAllText(jsonFile, json, updateDateWhenMatches: false, compareBeforeWrite: false);
                if (!_Configuration.SaveFullYearOfRandomFiles)
                    break;
            }
        }
    }

}