using System.Collections.ObjectModel;
using System.Globalization;
using System.Text;

namespace View_by_Distance.Shared.Models.Stateless;

internal abstract class XDate
{

    internal static (int Season, string seasonName) GetSeason(int dayOfYear)
    {
        (int Season, string seasonName) result = dayOfYear switch
        {
            < 78 => new(0, "Winter"),
            < 124 => new(1, "Spring"),
            < 171 => new(2, "Spring"),
            < 217 => new(3, "Summer"),
            < 264 => new(4, "Summer"),
            < 309 => new(5, "Fall"),
            < 354 => new(6, "Fall"),
            _ => new(7, "Winter")
        };
        return result;
    }

    private static (bool?, string[]) IsWrongYear(string[] segments, string year)
    {
        bool? result;
        string[] results = (
            from l
            in segments
            where l?.Length > 2
            && (
                l[..2] is "18" or "19" or "20"
            || (l.Length == 5 && l.Substring(1, 2) is "18" or "19" or "20" && (l[0] is '~' or '=' or '-' or '^' or '#'))
            || (l.Length == 6 && l[..2] is "18" or "19" or "20" && l[4] == '.')
            || (l.Length == 7 && l.Substring(1, 2) is "18" or "19" or "20" && l[5] == '.')
            )
            select l
        ).ToArray();
        string[] matches = (
            from l
            in results
            where l == year
            || (l.Length == 5 && l.Substring(1, 4) == year && (l[0] is '~' or '=' or '-' or '^' or '#'))
            || (l.Length == 6 && l[..4] == year && l[4] == '.')
            || (l.Length == 7 && l.Substring(1, 4) == year && l[5] == '.')
            select l
        ).ToArray();
        if (results.Length == 0)
            result = null;
        else
            result = matches.Length == 0;
        return new(result, results);
    }

    internal static (bool?, string[]) IsWrongYear(FilePath filePath, ExifDirectory exifDirectory)
    {
        string[] results = [];
        bool? result = null;
        string year;
        string directoryName;
        string[] directorySegments;
        List<DateTime> collection = [];
        string? check = Path.GetFullPath(filePath.FullName);
        string? pathRoot = Path.GetPathRoot(filePath.FullName);
        if (string.IsNullOrEmpty(pathRoot))
            throw new Exception();
        DateTime? dateTimeOriginal = GetDateTimeOriginal(exifDirectory);
        if (dateTimeOriginal is not null)
            collection.Add(dateTimeOriginal.Value);
        else
        {
            ReadOnlyCollection<DateTime> dateTimes = GetDateTimes(exifDirectory);
            foreach (DateTime dateTime in dateTimes)
                collection.Add(dateTime);
        }
        foreach (DateTime dateTime in collection)
        {
            year = dateTime.ToString("yyyy");
            for (int i = 0; i < int.MaxValue; i++)
            {
                check = Path.GetDirectoryName(check);
                if (string.IsNullOrEmpty(check) || check == pathRoot)
                    break;
                directoryName = Path.GetFileName(check);
                directorySegments = directoryName.Split(' ');
                (result, results) = IsWrongYear(directorySegments, year);
                if (result is not null)
                    break;
            }
            if (result is not null && !result.Value)
                break;
        }
        return new(result, results);
    }

    internal static DateTime? GetDateTimeOriginal(ExifDirectory exifDirectory)
    {
        DateTime? result;
        List<DateTime> results = [];
        foreach (ExifDirectoryBase exifDirectoryBase in exifDirectory.ExifBaseDirectories)
        {
            if (exifDirectoryBase.DateTimeOriginal is not null)
                results.Add(exifDirectoryBase.DateTimeOriginal.Value);
        }
        foreach (AviDirectory aviDirectory in exifDirectory.AviDirectories)
        {
            if (aviDirectory.DateTimeOriginal is not null)
                results.Add(aviDirectory.DateTimeOriginal.Value);
        }
        foreach (QuickTimeMovieHeaderDirectory quickTimeMovieHeaderDirectory in exifDirectory.QuickTimeMovieHeaderDirectories)
        {
            if (quickTimeMovieHeaderDirectory.Created is not null)
            {
                if (quickTimeMovieHeaderDirectory.Created.Value.Year == 1904 && quickTimeMovieHeaderDirectory.Created.Value.Month == 1 && quickTimeMovieHeaderDirectory.Created.Value.Day == 1)
                    continue;
                results.Add(quickTimeMovieHeaderDirectory.Created.Value);
            }
        }
        foreach (QuickTimeTrackHeaderDirectory quickTimeTrackHeaderDirectory in exifDirectory.QuickTimeTrackHeaderDirectories)
        {
            if (quickTimeTrackHeaderDirectory.Created is not null)
            {
                if ((quickTimeTrackHeaderDirectory.Created.Value.Year is 1904 or 1970) && quickTimeTrackHeaderDirectory.Created.Value.Month == 1 && quickTimeTrackHeaderDirectory.Created.Value.Day == 1)
                    continue;
                results.Add(quickTimeTrackHeaderDirectory.Created.Value);
            }
        }
        result = results.Count == 0 ? null : results.Min();
        return result;
    }

    private static DateTime? GetDateTimeFromName(string fileNameWithoutExtension)
    {
        DateTime? result = null;
        int length;
        string format;
        string fullFormat;
        StringBuilder value = new();
        const string ticksExample = "##################";
        string[][] dateFormats =
        [
            [string.Empty, "yyyyMMdd_HHmmss", string.Empty],
            [string.Empty, "yyyyMMddHHmmssfff", string.Empty],
            [string.Empty, "yyyyMMdd_", ticksExample],
            [string.Empty, "yyyy-MM-dd_", ticksExample],
            [string.Empty, "yyyy-MM-dd.", ticksExample],
            // [string.Empty, "yyyy-MM-dd.", $"{ticksExample}.{fileHolder.Length}"],
            [string.Empty, "yyyy-MM-dd HH.mm.ss", string.Empty],
            [string.Empty, "yyyyMMdd_HHmmss", "_LLS"],
            [string.Empty, "yyyyMMdd_HHmmss", "_HDR"],
            ["WIN_", "yyyyMMdd_HH_mm_ss", "_Pro"],
            ["IMG_", "yyyyMMdd_HHmmss", string.Empty],
            ["IMG#####-", "yyyyMMdd-HHmm", string.Empty],
            ["CameraZOOM-", "yyyyMMddHHmmss", string.Empty],
            ["VideoCapture_", "yyyyMMdd-HHmmss ", string.Empty]
        ];
        foreach (string[] dateFormat in dateFormats)
        {
            _ = value.Clear();
            if (dateFormat.Length != 3)
                throw new Exception();
            fullFormat = string.Join(string.Empty, dateFormat);
            if (fileNameWithoutExtension.Length != fullFormat.Length)
                continue;
            format = dateFormat[1];
            length = dateFormat[0].Length + dateFormat[1].Length;
            for (int i = dateFormat[0].Length; i < length; i++)
                _ = value.Append(fileNameWithoutExtension[i]);
            if (value.Length != format.Length)
                continue;
            if (DateTime.TryParseExact(value.ToString(), format, CultureInfo.InvariantCulture, DateTimeStyles.None, out DateTime checkDateTime))
            {
                if (fileNameWithoutExtension.Length < ticksExample.Length || !long.TryParse(fileNameWithoutExtension[^ticksExample.Length..], out long ticks))
                    result = checkDateTime;
                else
                    result = new DateTime(ticks);
                break;
            }
        }
        return result;
    }

    private static ReadOnlyCollection<DateTime> GetDateTimes(ExifDirectory exifDirectory)
    {
        List<DateTime> results = [];
        foreach (ExifDirectoryBase exifDirectoryBase in exifDirectory.ExifBaseDirectories)
        {
            if (exifDirectoryBase.DateTimeOriginal is not null)
                results.Add(exifDirectoryBase.DateTimeOriginal.Value);
        }
        foreach (AviDirectory aviDirectory in exifDirectory.AviDirectories)
        {
            if (aviDirectory.DateTimeOriginal is not null)
                results.Add(aviDirectory.DateTimeOriginal.Value);
        }
        foreach (QuickTimeMovieHeaderDirectory quickTimeMovieHeaderDirectory in exifDirectory.QuickTimeMovieHeaderDirectories)
        {
            if (quickTimeMovieHeaderDirectory.Created is not null)
            {
                if (quickTimeMovieHeaderDirectory.Created.Value.Year == 1904 && quickTimeMovieHeaderDirectory.Created.Value.Month == 1 && quickTimeMovieHeaderDirectory.Created.Value.Day == 1)
                    continue;
                results.Add(quickTimeMovieHeaderDirectory.Created.Value);
            }
        }
        foreach (QuickTimeTrackHeaderDirectory quickTimeTrackHeaderDirectory in exifDirectory.QuickTimeTrackHeaderDirectories)
        {
            if (quickTimeTrackHeaderDirectory.Created is not null)
            {
                if ((quickTimeTrackHeaderDirectory.Created.Value.Year is 1904 or 1970) && quickTimeTrackHeaderDirectory.Created.Value.Month == 1 && quickTimeTrackHeaderDirectory.Created.Value.Day == 1)
                    continue;
                results.Add(quickTimeTrackHeaderDirectory.Created.Value);
            }
        }
        if (results.Count == 0)
        {
            string fileNameWithoutExtension = Path.GetFileNameWithoutExtension(exifDirectory.OriginalFileName);
            DateTime? dateTime = GetDateTimeFromName(fileNameWithoutExtension);
            if (dateTime is not null)
                results.Add(dateTime.Value);
            foreach (ExifDirectoryBase exifDirectoryBase in exifDirectory.ExifBaseDirectories)
            {
                if (exifDirectoryBase.DateTime is not null)
                    results.Add(exifDirectoryBase.DateTime.Value);
                if (exifDirectoryBase.DateTimeDigitized is not null)
                    results.Add(exifDirectoryBase.DateTimeDigitized.Value);
            }
        }
        if (results.Count == 0)
        {
            foreach (FileMetadataDirectory fileMetadataDirectory in exifDirectory.FileMetadataDirectories)
            {
                if (fileMetadataDirectory.FileModifiedDate is not null)
                    results.Add(fileMetadataDirectory.FileModifiedDate.Value);
            }
        }
        return new(results);
    }

    internal static DateTime GetMinimum(ExifDirectory exifDirectory)
    {
        DateTime result;
        ReadOnlyCollection<DateTime> results = GetDateTimes(exifDirectory);
        result = results.Count == 0 ? DateTime.MinValue : results.Min();
        return result;
    }

}