RackPeek/RackPeek.Domain/Resources/SystemResources/UseCases/GetSystemSummaryUseCase.cs

namespace RackPeek.Domain.Resources.SystemResources.UseCases;

public sealed class SystemSummary {
    public SystemSummary(
        int totalSystems,
        IReadOnlyDictionary<string, int> systemsByType,
        IReadOnlyDictionary<string, int> systemsByOs) {
        TotalSystems = totalSystems;
        SystemsByType = systemsByType;
        SystemsByOs = systemsByOs;
    }

    public int TotalSystems { get; }
    public IReadOnlyDictionary<string, int> SystemsByType { get; }
    public IReadOnlyDictionary<string, int> SystemsByOs { get; }
}

public class GetSystemSummaryUseCase(ISystemRepository repository) : IUseCase {
    public async Task<SystemSummary> ExecuteAsync() {
        Task<int> totalSystemsTask = repository.GetSystemCountAsync();
        Task<Dictionary<string, int>> systemsByTypeTask = repository.GetSystemTypeCountAsync();
        Task<Dictionary<string, int>> systemsByOsTask = repository.GetSystemOsCountAsync();

        await Task.WhenAll(
            totalSystemsTask,
            systemsByTypeTask,
            systemsByOsTask
        );

        return new SystemSummary(
            totalSystemsTask.Result,
            systemsByTypeTask.Result,
            systemsByOsTask.Result
        );
    }
}