using Microsoft.Identity.Web;
using System.Security.Claims;

namespace Shogi.Api.Extensions;

public static class ClaimsExtensions
{
    // https://learn.microsoft.com/en-us/azure/active-directory/develop/id-tokens#payload-claims

    /// <summary>
    /// Get Id from claims after applying shogi-specific claims transformations.
    /// </summary>
    public static string GetShogiUserId(this ClaimsPrincipal self)
    {
        var id = self.GetNameIdentifierId();
        if (string.IsNullOrEmpty(id)) throw new InvalidOperationException("Shogi UserId not found in claims.");
        return id;
    }

    /// <summary>
    /// Get display name from claims after applying shogi-specific claims transformations.
    /// </summary>
    public static string GetShogiUserDisplayname(this ClaimsPrincipal self)
    {
        var displayName = self.Claims.FirstOrDefault(c => c.Type == ClaimTypes.Name)?.Value;
        if (string.IsNullOrEmpty(displayName)) throw new InvalidOperationException("Shogi Display name not found in claims.");
        return displayName;
    }

}