// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
 
using Microsoft.Extensions.Logging;
 
namespace Aspire.Hosting.ApplicationModel;
 
/// <summary>
/// Gathers environment variables for resources.
/// </summary>
internal class EnvironmentVariablesExecutionConfigurationGatherer : IExecutionConfigurationGatherer
{
    /// <inheritdoc/>
    public async ValueTask GatherAsync(IExecutionConfigurationGathererContext context, IResource resource, ILogger resourceLogger, DistributedApplicationExecutionContext executionContext, CancellationToken cancellationToken = default)
    {
        if (resource.TryGetEnvironmentVariables(out var callbacks))
        {
            var callbackContext = new EnvironmentCallbackContext(executionContext, resource, context.EnvironmentVariables, cancellationToken)
            {
                Logger = resourceLogger,
            };
 
            foreach (var callback in callbacks)
            {
                await callback.Callback(callbackContext).ConfigureAwait(false);
            }
        }
    }
}