using OTSSignsOrchestrator.Server.Clients;
using OTSSignsOrchestrator.Server.Data.Entities;

namespace OTSSignsOrchestrator.Server.Health.Checks;

/// <summary>
/// Verifies the per-instance SAML provider in Authentik is active by checking
/// the provider exists using the stored <see cref="Instance.AuthentikProviderId"/>.
/// </summary>
public sealed class AuthentikSamlProviderHealthCheck : IHealthCheck
{
    private readonly IAuthentikClient _authentikClient;
    private readonly ILogger<AuthentikSamlProviderHealthCheck> _logger;

    public string CheckName => "AuthentikSamlProvider";
    public bool AutoRemediate => false;

    public AuthentikSamlProviderHealthCheck(
        IAuthentikClient authentikClient,
        ILogger<AuthentikSamlProviderHealthCheck> logger)
    {
        _authentikClient = authentikClient;
        _logger = logger;
    }

    public async Task<HealthCheckResult> RunAsync(Instance instance, CancellationToken ct)
    {
        if (string.IsNullOrEmpty(instance.AuthentikProviderId))
        {
            return new HealthCheckResult(HealthStatus.Degraded,
                "No Authentik provider ID stored — SAML not provisioned");
        }

        if (!int.TryParse(instance.AuthentikProviderId, out var providerId))
        {
            return new HealthCheckResult(HealthStatus.Critical,
                $"Invalid Authentik provider ID: {instance.AuthentikProviderId}");
        }

        try
        {
            var response = await _authentikClient.GetSamlProviderAsync(providerId);

            if (response.IsSuccessStatusCode && response.Content is not null)
            {
                return new HealthCheckResult(HealthStatus.Healthy,
                    $"SAML provider {providerId} is active in Authentik");
            }

            return new HealthCheckResult(HealthStatus.Critical,
                $"SAML provider {providerId} not found or inaccessible",
                response.Error?.Content);
        }
        catch (Exception ex)
        {
            return new HealthCheckResult(HealthStatus.Critical,
                $"Failed to check SAML provider: {ex.Message}");
        }
    }
}