using Nexus.Api.Data;
using Nexus.Api.DTOs;

namespace Nexus.Api.Services;

public enum TaskOperationOutcome { Success, NotFound, InvalidState }

public sealed record TaskOperationResult(TaskOperationOutcome Outcome, WorkTask? Task = null);

public interface ITaskService
{
    Task<IReadOnlyList<WorkTask>> GetAllAsync(CancellationToken ct = default);
    Task<WorkTask?> GetByIdAsync(Guid id, CancellationToken ct = default);
    Task<IReadOnlyList<WorkTask>> GetPendingApprovalAsync(CancellationToken ct = default);
    Task<WorkTask> CreateAsync(CreateTaskRequest request, CancellationToken ct = default);
    Task<TaskOperationResult> ApproveAsync(Guid id, CancellationToken ct = default);
    Task<TaskOperationResult> RejectAsync(Guid id, CancellationToken ct = default);
    Task<TaskOperationResult> UpdateStateAsync(Guid id, string state, CancellationToken ct = default);
    Task<TaskOperationResult> UpdateAsync(Guid id, UpdateTaskRequest request, CancellationToken ct = default);
    Task<TaskOperationResult> DeleteAsync(Guid id, CancellationToken ct = default);

    // Dashboard-facing task operations
    Task<IReadOnlyList<WorkTask>> GetOpenAsync(CancellationToken ct = default);
    Task<WorkTask> CreateDashboardTaskAsync(string title, string? detail, string? source, string? priority, string? assignedTo, CancellationToken ct = default);
    Task<TaskOperationResult> UpdateDashboardTaskAsync(Guid id, string? title, string? detail, string? source, string? priority, string? assignedTo, CancellationToken ct = default);
    Task<TaskOperationResult> UpdateStatusAsync(Guid id, string status, CancellationToken ct = default);
    Task<TaskOperationResult> CompleteViaQueueAsync(Guid id, CancellationToken ct = default);
    Task<TaskOperationResult> CyclePriorityAsync(Guid id, CancellationToken ct = default);
}