using Microsoft.Extensions.Diagnostics.HealthChecks;
using Microsoft.Extensions.Options;
using Socialize.Api.Infrastructure.BlobStorage.Configuration;
using Socialize.Api.Infrastructure.BlobStorage.Services;

namespace Socialize.Api.Infrastructure.Observability;

internal sealed class LocalBlobStorageHealthCheck(
    LocalBlobStorage blobStorage,
    IOptions<LocalBlobStorageOptions> options)
    : IHealthCheck
{
    public async Task<HealthCheckResult> CheckHealthAsync(
        HealthCheckContext context,
        CancellationToken cancellationToken = default)
    {
        string rootPath = blobStorage.GetRootPath();
        if (string.IsNullOrWhiteSpace(options.Value.RequestPath))
        {
            return HealthCheckResult.Unhealthy("Local blob storage request path is not configured.");
        }

        try
        {
            Directory.CreateDirectory(rootPath);
            string probePath = Path.Combine(rootPath, ".healthcheck");
            await File.WriteAllTextAsync(
                probePath,
                DateTimeOffset.UtcNow.ToString("O", System.Globalization.CultureInfo.InvariantCulture),
                cancellationToken);
            File.Delete(probePath);

            return HealthCheckResult.Healthy("Local blob storage is writable.");
        }
        catch (Exception ex) when (ex is IOException or UnauthorizedAccessException)
        {
            return HealthCheckResult.Unhealthy("Local blob storage is not writable.", ex);
        }
    }
}