using System.Collections.Concurrent;
using Sln.Wcs.HikRoBotApi.Domain.Dto.GenAgvSchedulingTask;
using Sln.Wcs.HikRoBotApi.Enum;
using Sln.Wcs.HikRoBotApi.Service;
using Sln.Wcs.HoistApi.Domain.Dto.HoistTaskExecutor;
using Sln.Wcs.HoistApi.Domain.Enum;
using Sln.Wcs.HoistApi.Service;
using Sln.Wcs.Model.Domain;
using Sln.Wcs.Repository.service;

namespace Sln.Wcs.Strategy;

public class TaskExecuteStrategy : ITaskExecuteStrategy
{
    private readonly ILiveTaskQueueService _taskQueueService;
    private readonly ILiveTaskDetailService _taskDetailService;
    private readonly IHikRoBotService _hikRobotService;
    private readonly IHoistApiService _hoistService;

    // AGV 多车并发，默认最大 10 个并发
    private readonly SemaphoreSlim _agvSemaphore = new(10, 10);

    // 提升机按设备串行，每台提升机一次只能执行一个任务
    private readonly ConcurrentDictionary<string, SemaphoreSlim> _hoistSemaphores = new();

    public TaskExecuteStrategy(
        ILiveTaskQueueService taskQueueService,
        ILiveTaskDetailService taskDetailService,
        IHikRoBotService hikRobotService,
        IHoistApiService hoistService)
    {
        _taskQueueService = taskQueueService;
        _taskDetailService = taskDetailService;
        _hikRobotService = hikRobotService;
        _hoistService = hoistService;
    }

    public Task ExecuteAsync(CancellationToken cancellationToken = default)
    {
        return Task.WhenAll(
            ProcessCategory(1, cancellationToken), // 包材
            ProcessCategory(2, cancellationToken), // 成品
            ProcessCategory(3, cancellationToken)  // 托盘
        );
    }

    /// <summary>
    /// 按任务类别轮询待执行任务，同一类别内多个任务并行处理
    /// </summary>
    private async Task ProcessCategory(int taskCategory, CancellationToken ct)
    {
        while (!ct.IsCancellationRequested)
        {
            try
            {
                var pendingTasks = _taskQueueService.Query(x =>
                    x.taskStatus == 1 && x.taskCategory == taskCategory);

                if (pendingTasks.Count > 0)
                {
                    await Parallel.ForEachAsync(pendingTasks, ct, async (task, innerCt) =>
                    {
                        await ProcessTask(task, innerCt);
                    });
                }
            }
            catch (Exception ex)
            {
                Console.WriteLine($"任务类别 {taskCategory} 调度异常: {ex.Message}");
            }

            await Task.Delay(1000, ct);
        }
    }

    /// <summary>
    /// 处理单个任务：按顺序遍历明细步骤，依次下发到对应设备
    /// </summary>
    private async Task ProcessTask(LiveTaskQueue task, CancellationToken ct)
    {
        try
        {
            var details = _taskDetailService.Query(x =>
                    x.taskCode == task.taskCode && x.taskStatus == 1)
                .OrderBy(x => x.objId)
                .ToList();

            foreach (var detail in details)
            {
                if (ct.IsCancellationRequested) return;

                var success = await DispatchDetail(detail);
                if (!success) break;
            }

            // 检查是否还有待执行的明细，若无则更新队列状态为执行中
            var remainingPending = _taskDetailService.Query(x =>
                x.taskCode == task.taskCode && x.taskStatus == 1);

            if (remainingPending.Count == 0)
            {
                task.taskStatus = 2;
                _taskQueueService.Update(task);
            }
        }
        catch (Exception ex)
        {
            Console.WriteLine($"任务 {task.taskCode} 处理异常: {ex.Message}");
        }
    }

    /// <summary>
    /// 根据设备类型分发明细到对应设备 API
    /// </summary>
    private Task<bool> DispatchDetail(LiveTaskDetail detail)
    {
        return detail.deviceType switch
        {
            1 => DispatchToAgv(detail),
            2 => DispatchToHoist(detail),
            _ => Task.FromResult(false) // ConveyorLine 暂不处理
        };
    }

    /// <summary>
    /// 下发 AGV 任务，通过 HikRoBotApi（AGV 多车可并发）
    /// </summary>
    private async Task<bool> DispatchToAgv(LiveTaskDetail detail)
    {
        await _agvSemaphore.WaitAsync();
        try
        {
            var dto = new GenAgvSchedulingTaskDto
            {
                reqCode = detail.taskCode,
                reqTime = DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"),
                clientCode = "WCS",
                taskCode = detail.taskCode,
                taskTyp = detail.taskType switch { 1 => "1", 2 => "2", _ => "0" },
                taskMode = detail.taskType switch { 1 => "2", 2 => "1", _ => "0" },
                wbCode = detail.startPoint,
                ctnrCode = detail.palletBarcode,
                materialLot = detail.materialBarcode,
                positionCodePath = new List<Position>
                {
                    new() { positionCode = detail.startPoint, type = "00" },
                    new() { positionCode = detail.endPoint, type = "00" }
                }
            };

            var result = _hikRobotService.GetGenAgvSchedulingTask(dto);
            if (result.code.Equals(HikRoBotStatusEnum.成功))
            {
                detail.taskStatus = 2;
                _taskDetailService.Update(detail);
                return true;
            }

            Console.WriteLine($"AGV 任务 {detail.taskCode} 下发失败: [{result.code}] {result.msg}");
            return false;
        }
        finally
        {
            _agvSemaphore.Release();
        }
    }

    /// <summary>
    /// 下发提升机任务，通过 HoistApi（每台提升机串行）
    /// </summary>
    private async Task<bool> DispatchToHoist(LiveTaskDetail detail)
    {
        var hoistCode = detail.startPoint ?? "default";
        var semaphore = _hoistSemaphores.GetOrAdd(hoistCode, _ => new SemaphoreSlim(1, 1));

        await semaphore.WaitAsync();
        try
        {
            var dto = new HoistTaskExeDto
            {
                hoistCode = hoistCode,
                taskCode = detail.taskCode,
                startPoint = int.TryParse(detail.startPoint, out var s) ? s : 0,
                endPoint = int.TryParse(detail.endPoint, out var e) ? e : 0
            };

            var result = _hoistService.HoistTaskExecutor(dto);
            if (result.code.Equals(HoistStatusEnum.成功))
            {
                detail.taskStatus = 2;
                _taskDetailService.Update(detail);
                return true;
            }

            Console.WriteLine($"提升机 {hoistCode} 任务 {detail.taskCode} 下发失败: [{result.code}] {result.msg}");
            return false;
        }
        finally
        {
            semaphore.Release();
        }
    }
}