using Sln.Wcs.Business.Domain.Enum;
using Sln.Wcs.Model.Domain;
using Sln.Wcs.Serilog;

namespace Sln.Wcs.Business;

/// <summary>
/// 接驳位拓扑驱动的任务创建服务
/// 根据起止楼栋/楼层/位置，自动生成 LiveTaskQueue 及其子任务明细序列
/// </summary>
public class TaskCreateService
{
    private readonly SerilogHelper _logger;

    public TaskCreateService(SerilogHelper logger) => _logger = logger;

    #region 拓扑配置

    private record TopoNode(int Building, int Floor);

    /// <summary>
    /// 拓扑邻接表：(栋,层) → 可达的相邻节点
    /// 所有楼栋 1~5F，本栋提升机可直达任意楼层（全连接）
    /// 跨栋仅 2F 连通: (13,2)↔(14,2) 廊桥交接, (14,2)↔(15,2) AGV直连
    /// </summary>
    private static readonly Dictionary<TopoNode, List<TopoNode>> Topology = BuildTopology();

    private static Dictionary<TopoNode, List<TopoNode>> BuildTopology()
    {
        var dict = new Dictionary<TopoNode, List<TopoNode>>();

        // 每个楼栋内全连接（提升机直达任意楼层）
        foreach (var building in new[] { 13, 14, 15 })
        {
            for (int f1 = 1; f1 <= 5; f1++)
            {
                var neighbors = new List<TopoNode>();
                for (int f2 = 1; f2 <= 5; f2++)
                {
                    if (f1 != f2)
                        neighbors.Add(new(building, f2));
                }
                dict[new(building, f1)] = neighbors;
            }
        }

        // 跨栋: 仅 2F 连通
        dict[new(13, 2)].Add(new(14, 2));  // 13↔14 廊桥交接
        dict[new(14, 2)].Add(new(13, 2));
        dict[new(14, 2)].Add(new(15, 2));  // 14↔15 AGV直连
        dict[new(15, 2)].Add(new(14, 2));

        return dict;
    }

    #endregion

    /// <summary>
    /// 创建任务：输入楼栋/楼层/位置号，自动生成明细序列
    /// </summary>
    /// <param name="startBuilding">起始楼栋 (13/14/15)</param>
    /// <param name="startFloor">起始楼层</param>
    /// <param name="startLocation">起始位置号，如 "01"</param>
    /// <param name="endBuilding">目标楼栋 (13/14/15)</param>
    /// <param name="endFloor">目标楼层</param>
    /// <param name="endLocation">目标位置号，如 "02"</param>
    /// <param name="taskType">任务类型: 1-入库, 2-出库</param>
    /// <param name="taskCategory">任务类别: 1-包材, 2-成品, 3-托盘</param>
    /// <param name="palletBarcode">托盘条码</param>
    /// <param name="materialCode">物料编码</param>
    /// <returns>完整 LiveTaskQueue（含明细列表）</returns>
    public LiveTaskQueue CreateTask(
        int startBuilding, int startFloor, string startLocation,
        int endBuilding, int endFloor, string endLocation,
        int taskType, int taskCategory,
        string palletBarcode, string materialCode)
    {
        var startPoint = PosCode(startBuilding, startFloor, startLocation);
        var endPoint = PosCode(endBuilding, endFloor, endLocation);

        _logger.Info($"创建任务 - {startPoint} ({startBuilding}#_{startFloor}F) → {endPoint} ({endBuilding}#_{endFloor}F)");

        // Step 1: BFS 找最短路径（节点序列）
        var nodes = FindPath(startBuilding, startFloor, endBuilding, endFloor);
        _logger.Info($"路由节点: {string.Join(" → ", nodes.Select(n => $"({n.Building},{n.Floor})"))}");

        // Step 2: 沿节点路径逐段生成明细
        // 规则: 同层移动=AGV, 跨层=提升机, 跨栋(13↔14)=廊桥交接两段AGV
        var details = new List<LiveTaskDetail>();
        int seq = 1;
        var taskCode = GenerateTaskCode();
        string currentPos = startPoint; // 当前货物所在接驳位

        for (int i = 0; i < nodes.Count - 1; i++)
        {
            var (b1, f1) = nodes[i];
            var (b2, f2) = nodes[i + 1];

            if (b1 != b2) // 跨栋
            {
                if (IsBridgeRequired(b1, b2))
                {
                    // 13↔14: 廊桥交接 — 13# AGV 送到廊桥，等待 14# AGV
                    details.Add(NewDetail(taskCode, palletBarcode, materialCode,
                        taskType, taskCategory, seq++, currentPos, "BRIDGE_13_14", deviceType: 1));
                    currentPos = "BRIDGE_13_14";
                }
                // 14↔15: 14# AGV 可直接驶入 15#，不生成过渡段，由下一步直达
            }
            else if (f1 != f2) // 同栋跨层 → AGV到提升机入口 + 提升机
            {
                var hoistEntry = HoistPoint(b1, f1);
                var hoistExit = HoistPoint(b2, f2);

                details.Add(NewDetail(taskCode, palletBarcode, materialCode,
                    taskType, taskCategory, seq++, currentPos, hoistEntry, deviceType: 1));
                details.Add(NewDetail(taskCode, palletBarcode, materialCode,
                    taskType, taskCategory, seq++, hoistEntry, hoistExit, deviceType: 2));

                currentPos = hoistExit;
            }
        }

        // Step 3: 最终 AGV 送达终点（同栋同层时直接一条 AGV）
        if (details.Count == 0 || currentPos != endPoint)
        {
            details.Add(NewDetail(taskCode, palletBarcode, materialCode,
                taskType, taskCategory, seq, currentPos, endPoint, deviceType: 1));
        }

        _logger.Info($"生成 {details.Count} 条明细");

        return new LiveTaskQueue
        {
            taskCode = taskCode,
            taskType = taskType,
            taskCategory = taskCategory,
            taskStatus = 1,
            startPoint = startPoint,
            endPoint = endPoint,
            palletBarcode = palletBarcode,
            materialCode = materialCode,
            taskSteps = details.Count,
            taskDetails = details,
        };
    }

    #region 内部方法

    /// <summary>BFS 最短路径</summary>
    private static List<TopoNode> FindPath(int b_s, int f_s, int b_e, int f_e)
    {
        var start = new TopoNode(b_s, f_s);
        var end = new TopoNode(b_e, f_e);
        if (start == end) return new List<TopoNode> { start };

        // 校验起止节点是否在拓扑中
        if (!Topology.ContainsKey(start))
            throw new InvalidOperationException($"起始位置不在拓扑中: {b_s}#_{f_s}F，可用节点: {string.Join(", ", Topology.Keys.Select(n => $"{n.Building}#_{n.Floor}F"))}");
        if (!Topology.ContainsKey(end))
            throw new InvalidOperationException($"目标位置不在拓扑中: {b_e}#_{f_e}F，可用节点: {string.Join(", ", Topology.Keys.Select(n => $"{n.Building}#_{n.Floor}F"))}");

        var visited = new HashSet<TopoNode> { start };
        var queue = new Queue<List<TopoNode>>();
        queue.Enqueue(new List<TopoNode> { start });

        while (queue.Count > 0)
        {
            var path = queue.Dequeue();
            var current = path[^1];

            if (!Topology.TryGetValue(current, out var neighbors)) continue;

            foreach (var next in neighbors)
            {
                if (visited.Contains(next)) continue;
                var newPath = new List<TopoNode>(path) { next };
                if (next == end) return newPath;
                visited.Add(next);
                queue.Enqueue(newPath);
            }
        }

        throw new InvalidOperationException($"无路径: ({b_s},{f_s}) → ({b_e},{f_e})");
    }

    /// <summary>是否需要廊桥交接</summary>
    private static bool IsBridgeRequired(int b1, int b2) =>
        (b1 == 13 && b2 == 14) || (b1 == 14 && b2 == 13);

    /// <summary>拼接位置编码: 楼栋#_L楼层_位置号</summary>
    private static string PosCode(int building, int floor, string location) =>
        $"{building}#_L{floor}_{location}";

    /// <summary>提升机接驳位</summary>
    private static string HoistPoint(int building, int floor) =>
        $"{building}#_L{floor}_HOIST";

    /// <summary>普通接驳位（非提升机、非廊桥）</summary>
    private static string DockingPoint(int building, int floor) =>
        $"{building}#_L{floor}_01";

    /// <summary>生成任务编号</summary>
    private static string GenerateTaskCode() =>
        DateTime.Now.ToString("yyyyMMddHHmmss") + new Random().Next(10, 99);

    /// <summary>创建一条 LiveTaskDetail</summary>
    private static LiveTaskDetail NewDetail(
        string taskCode, string palletBarcode, string materialCode,
        int taskType, int taskCategory, int seq,
        string startPoint, string endPoint, int deviceType) =>
        new()
        {
            taskCode = taskCode,
            objId = seq,
            palletBarcode = palletBarcode,
            materialCode = materialCode,
            startPoint = startPoint,
            endPoint = endPoint,
            deviceType = deviceType,
            taskType = taskType,
            taskCategory = taskCategory,
            taskStatus = 1,
        };

    #endregion
}