namespace DigitalData.Core.Abstractions.Security
{
    public static class SecurityExtensions
    {
        public static IEnumerable<TUniqueSecurityContext> GetByIssuer<TUniqueSecurityContext>(this IEnumerable<TUniqueSecurityContext> contextes, string issuer) where TUniqueSecurityContext: IUniqueSecurityContext
            => contextes.Where(c => c.Issuer == issuer);

        public static IEnumerable<TUniqueSecurityContext> GetByAudience<TUniqueSecurityContext>(this IEnumerable<TUniqueSecurityContext> contextes, string audience) where TUniqueSecurityContext : IUniqueSecurityContext
            => contextes.Where(c => c.Audience == audience);

        public static TUniqueSecurityContext Get<TUniqueSecurityContext>(this IEnumerable<TUniqueSecurityContext> contextes, string issuer, string audience) where TUniqueSecurityContext : IUniqueSecurityContext
            => contextes.Where(c => c.Issuer == issuer && c.Audience == audience).SingleOrDefault()
            ?? throw new InvalidOperationException($"Exactly one {typeof(TUniqueSecurityContext).Name} must exist with Issuer: '{issuer}' and Audience: '{audience}'.");

        public static bool TryGet<TUniqueSecurityContext>(this IEnumerable<TUniqueSecurityContext> contextes, string issuer, string audience, out TUniqueSecurityContext context) where TUniqueSecurityContext : IUniqueSecurityContext
        {
#pragma warning disable CS8601 // Possible null reference assignment.
            context = contextes.SingleOrDefault(c => c.Issuer == issuer && c.Audience == audience);
#pragma warning restore CS8601 // Possible null reference assignment.
            return context is not null;
        }

        public static TUniqueSecurityContext Match<TUniqueSecurityContext>(this IEnumerable<TUniqueSecurityContext> contextes, IUniqueSecurityContext lookupContext) where TUniqueSecurityContext : IUniqueSecurityContext
            => contextes.Get(lookupContext.Issuer, lookupContext.Audience);

        public static bool TryMatch<TUniqueSecurityContext>(this IEnumerable<TUniqueSecurityContext> contextes, IUniqueSecurityContext lookupContext, out TUniqueSecurityContext context) where TUniqueSecurityContext : IUniqueSecurityContext
            => contextes.TryGet(lookupContext.Issuer, lookupContext.Audience, out context);
    }
}