using OrpaonVision.Core.Results;
using OrpaonVision.SiteApp.Runtime.Contracts;
using OrpaonVision.SiteApp.Runtime.Options;

namespace OrpaonVision.SiteApp.Runtime.Services
{
    /// <summary>
    /// 运行状态机简化实现（MVP 阶段）。
    /// </summary>
    public sealed class SimpleRuntimeStateMachineService : IRuntimeStateMachineService
    {
        private readonly RuntimeOptions _options;

        private int _currentLayer;

        /// <summary>
        /// 构造函数。
        /// </summary>
        public SimpleRuntimeStateMachineService(RuntimeOptions options)
        {
            _options = options;
            _currentLayer = 1;
        }

        /// <inheritdoc />
        public RuntimeStateSnapshotDto GetSnapshot()
        {
            return new RuntimeStateSnapshotDto
            {
                CurrentLayer = _currentLayer,
                TotalLayers = _options.TotalLayers,
                StateText = _currentLayer > _options.TotalLayers ? "工位完成" : "运行中"
            };
        }

        /// <inheritdoc />
        public Result MoveToNextLayer()
        {
            if (_currentLayer >= _options.TotalLayers)
            {
                return Result.Fail("STATE_MACHINE_FINISHED", "当前已到最后一层，无法继续切层。");
            }

            _currentLayer += 1;
            return Result.Success("STATE_MACHINE_MOVED", $"已切换到第 {_currentLayer} 层。");
        }

        /// <inheritdoc />
        public void Reset()
        {
            _currentLayer = 1;
        }
    }
}