using System.Collections.ObjectModel;
using View_by_Distance.Shared.Models;

namespace View_by_Distance.Map.Models.Stateless;

internal abstract class DecadeLogic
{

    internal static string GetDecade(MappingFromItem mappingFromItem)
    {
        string result;
        string year;
        if (mappingFromItem.DateTimeOriginal is null)
        {
            year = mappingFromItem.MinimumDateTime.Year.ToString();
            result = year[3] > '4' ? $"#{year[..3]}+" : $"#{year[..3]}-";
        }
        else
        {
            year = mappingFromItem.DateTimeOriginal.Value.Year.ToString();
            result = year[3] > '4' ? $"^{year[..3]}+" : $"^{year[..3]}-";
        }
        return result;
    }

    internal static void SetCreationTimeMaybeMoveToDecade(Property.Models.Configuration propertyConfiguration, bool moveToDecade, MappingFromItem mappingFromItem, ReadOnlyCollection<LocationContainer<MetadataExtractor.Directory>> locationContainers)
    {
        DateTime dateTime;
        FileInfo fileInfo;
        string halfDecade;
        string checkDirectory;
        string? yearDirectory;
        string yearDirectoryName;
        string? personNameDirectory;
        string personNameDirectoryName;
        string? personKeyFormattedDirectory;
        string? personKeyFormattedDirectoryName;
        foreach (LocationContainer<MetadataExtractor.Directory> locationContainer in locationContainers)
        {
            fileInfo = new(locationContainer.File);
            if (!fileInfo.Exists)
                continue;
            dateTime = mappingFromItem.DateTimeOriginal is null ? mappingFromItem.MinimumDateTime : mappingFromItem.DateTimeOriginal.Value;
            if (fileInfo.CreationTime != dateTime)
                File.SetCreationTime(locationContainer.File, dateTime);
            if (!moveToDecade)
                continue;
            personNameDirectory = Path.GetDirectoryName(locationContainer.File);
            if (string.IsNullOrEmpty(personNameDirectory))
                continue;
            personNameDirectoryName = Path.GetFileName(personNameDirectory);
            yearDirectory = Path.GetDirectoryName(personNameDirectory);
            if (string.IsNullOrEmpty(yearDirectory))
                continue;
            yearDirectoryName = Path.GetFileName(yearDirectory);
            personKeyFormattedDirectory = Path.GetDirectoryName(yearDirectory);
            if (string.IsNullOrEmpty(personKeyFormattedDirectory))
                continue;
            personKeyFormattedDirectoryName = Path.GetFileName(personKeyFormattedDirectory);
            if (personKeyFormattedDirectoryName.Length != propertyConfiguration.PersonBirthdayFormat.Length)
                break;
            halfDecade = GetDecade(mappingFromItem);
            if (halfDecade == yearDirectoryName)
                continue;
            checkDirectory = Path.Combine(personKeyFormattedDirectory, halfDecade, personNameDirectoryName);
            if (!Directory.Exists(checkDirectory))
                _ = Directory.CreateDirectory(checkDirectory);
            File.Move(locationContainer.File, Path.Combine(checkDirectory, Path.GetFileName(locationContainer.File)));
        }
    }

}