using ECMJobRunner.Application.ProfileHistories.Commands;
using ECMJobRunner.Domain.Entities;
using ECMJobRunner.Domain.Interfaces;
using ECMJobRunner.Domain.ValueObjects;
using MediatR;
using ReC.Client.Api;
using System.Threading;
using System.Threading.Tasks;

namespace ECMJobRunner.Application.Profiles.Commands
{
    /// <summary>
    /// Command to trigger a single DEX job execution
    /// Execution logic is handled by pipeline behaviors:
    /// 1. MainQueryExecutionBehavior - executes main SQL query
    /// 2. CheckQueryExecutionBehavior - validates with check SQL query
    /// 3. ReCRequestExecutionBehavior - invokes ReC HTTP request
    /// </summary>
    public class TriggeringProfileJobCommand : IRequest<Unit>
    {
        /// <summary>
        /// The SQL job to execute
        /// </summary>
        public ProfileSqlJob Job { get; set; } = null!;

        /// <summary>
        /// Unique batch identifier for this execution
        /// </summary>
        public string BatchId { get; set; } = null!;

        internal BatchRecActionViewResponse? RecActionResult { get; set; }
    }

    /// <summary>
    /// Handler for TriggeringDEXJobCommand
    /// All execution logic is delegated to pipeline behaviors
    /// This handler simply returns completion after behaviors execute
    /// </summary>
    public class TriggeringDEXJobCommandHandler(ISender Sender) : IRequestHandler<TriggeringProfileJobCommand, Unit>
    {
        /// <summary>
        /// Handles the TriggeringDEXJobCommand
        /// Returns immediately as behaviors perform all work
        /// </summary>
        /// <param name="request">The command containing job and batch ID</param>
        /// <param name="cancellationToken">Cancellation token</param>
        /// <returns>Unit value indicating completion</returns>
        public async Task<Unit> Handle(TriggeringProfileJobCommand request, CancellationToken cancellationToken)
        {
            // All execution logic is handled by pipeline behaviors:
            // - MainQueryExecutionBehavior
            // - CheckQueryExecutionBehavior
            // - ReCRequestExecutionBehavior

            var cmd = new CreateProfileHistoryCommand
            {
                Result = ResultType.Ok,
                ResultText = $"Job '{request.Job.Name}' erfolgreich abgeschlossen. | Batch-ID: {request.BatchId} | Verarbeitete Aktionen: {request.RecActionResult?.TotalActionCount ?? 0} | Fehlgeschlagene Aktionen: {request.RecActionResult?.ActionExceptionCount ?? 0}",
                ProfileId = request.Job.ProfileId,
                AddedWho = "ECMJobRunner"
            };

            await Sender.Send(cmd, cancellationToken);

            return Unit.Value;
        }
    }
}