using MaybeError;
using MaybeError.Errors;

using MongoDB.Bson;
using MongoDB.Bson.Serialization.Attributes;

using System.Text.RegularExpressions;

namespace AZKiServer.Models;

public partial class MediaEntry
{
	public const int CUR_VERSION = 1;
	[BsonId]
	public ObjectId Id { get; set; }
	public int Version { get; set; }
	public MediaType Type { get; set; }
	public required string Filepath { get; set; }
	public DateTime Date { get; set; }
	public DateTime EndDate { get; set; }
	public int CameraId { get; set; }
	public required MediaMetadata Metadata { get; set; }

	public static Maybe<MediaEntry> Parse(string relativePath, MediaMetadata metadata)
	{
		var filename = Path.GetFileName(relativePath);

		var match = FileParser().Match(filename);
		if (!match.Success)
			return new Error("Failed to parse file name");

		try
		{
			var src = match.Groups["src"];
			var cam = match.Groups["cam"];
			var date = match.Groups["date"];
			var ext = match.Groups["ext"];
			var startDate = ParseDate(date.Value);
			return new MediaEntry
			{
				Version = CUR_VERSION,
				CameraId = int.Parse(cam.Value),
				Filepath = relativePath,
				Date = startDate,
				EndDate = startDate.AddSeconds(metadata.Duration),
				Metadata = metadata,
				Type = ext.Value switch
				{
					"mp4" => MediaType.Video,
					_ => MediaType.Image
				}

			};

		}catch(Exception ex)
		{
			return ex;
		}
	}

	private static DateTime ParseDate(string dateString)
	{
		var year = dateString[0..4];
		var month = dateString[4..6];
		var day = dateString[6..8];
		var hour = dateString[8..10];
		var minute = dateString[10..12];
		var sec = dateString[12..];
		return new DateTime(int.Parse(year), int.Parse(month), int.Parse(day), int.Parse(hour), int.Parse(minute), int.Parse(sec), DateTimeKind.Local);
	}

	[GeneratedRegex("(?'src'.+)_(?'cam'\\d+)_(?'date'\\d+).(?'ext'\\w+)")]
	private static partial Regex FileParser();
}

public record MediaMetadata(int Duration, int Height, int Width);

[Flags]
public enum MediaType
{
	None = 0,
	Video = 1,
	Image = 2,
	All = Video | Image
}