using System.Security.Cryptography;

namespace RunnersMeet.Server.Persistence;

public class FileName
{
	public string Hash { get; }
	public string DisplayName { get; }

	private FileName(string hash, string displayName)
	{
		Hash = hash;
		DisplayName = displayName;
	}

	public string GetPath()
	{
		return Path.Combine(Hash.Substring(0, 2), Hash.Substring(2, 2), Hash);
	}

	public static async Task<FileName> FromFormUploadAsync(IFormFile file, string? displayName, CancellationToken cancellationToken = default)
	{
		var sha1 = SHA1.Create();
		var hash = Convert.ToHexString(await sha1.ComputeHashAsync(file.OpenReadStream(), cancellationToken));

		return new FileName(hash, displayName ?? file.FileName);
	}
}