using System.Collections.Generic;
using System.Threading.Tasks;
using ColdMint.scripts.debug;
using ColdMint.scripts.map.interfaces;

namespace ColdMint.scripts.map;

/// <summary>
/// <para>Map generator</para>
/// <para>地图生成器</para>
/// </summary>
/// <remarks>
///<para>Responsible for the overall map generation process control</para>
///<para>负责地图的整体生成流程控制</para>
/// </remarks>
public static class MapGenerator
{
    /// <summary>
    /// <para>Layout map selection strategy</para>
    /// <para>布局图选择策略</para>
    /// </summary>
    private static ILayoutStrategy? _layoutStrategy;

    /// <summary>
    /// <para>Room placement strategy</para>
    /// <para>房间的放置策略</para>
    /// </summary>
    private static IRoomPlacementStrategy? _roomPlacementStrategy;


    /// <summary>
    /// <para>Layout diagram parsing policy</para>
    /// <para>布局图解析策略</para>
    /// </summary>
    private static ILayoutParsingStrategy? _layoutParsingStrategy;

    public static ILayoutParsingStrategy? LayoutParsingStrategy
    {
        get => _layoutParsingStrategy;
        set => _layoutParsingStrategy = value;
    }

    public static IRoomPlacementStrategy? RoomPlacementStrategy
    {
        get => _roomPlacementStrategy;
        set => _roomPlacementStrategy = value;
    }

    public static ILayoutStrategy? LayoutStrategy
    {
        get => _layoutStrategy;
        set => _layoutStrategy = value;
    }

    /// <summary>
    /// <para>Generating a map</para>
    /// <para>生成地图</para>
    /// </summary>
    public static async Task GenerateMap()
    {
        if (_layoutStrategy == null || _roomPlacementStrategy == null || _layoutParsingStrategy == null)
        {
            LogCat.LogError("map_generator_missing_parameters");
            return;
        }

        //Get the layout data
        //拿到布局图数据
        var levelGraphEditorSaveData = await _layoutStrategy.GetLayout();
        if (levelGraphEditorSaveData.RoomNodeDataList == null || levelGraphEditorSaveData.RoomNodeDataList.Count == 0)
        {
            LogCat.LogError("map_generator_attempts_to_parse_empty_layout_diagrams");
            return;
        }

        _layoutParsingStrategy.SetLevelGraph(levelGraphEditorSaveData);
        //Save the dictionary, put the ID in the room data, corresponding to the successful placement of the room.
        //保存字典，将房间数据内的ID，对应放置成功的房间。
        var roomDictionary = new Dictionary<string, IRoom>();
        while (await _layoutParsingStrategy.HasNext())
        {
            //When a new room needs to be placed
            //当有新的房间需要放置时
            var roomNodeData = await _layoutParsingStrategy.Next();
            if (roomNodeData == null)
            {
                continue;
            }

            var nextParentNodeId = await _layoutParsingStrategy.GetNextParentNodeId();
            IRoom? parentRoomNode = null;
            if (nextParentNodeId != null)
            {
                //If the new room has the parent's ID, then we pass the parent's room into the compute function.
                //如果新房间有父节点的ID，那么我们将父节点的房间传入到计算函数内。
                parentRoomNode = roomDictionary[nextParentNodeId];
            }

            var roomPlacementData =
                await _roomPlacementStrategy.CalculateNewRoomPlacementData(parentRoomNode, roomNodeData);
            if (roomPlacementData == null)
            {
                continue;
            }

            if (!await _roomPlacementStrategy.PlaceRoom(roomPlacementData))
            {
                continue;
            }

            if (!string.IsNullOrEmpty(roomNodeData.Id) && roomPlacementData.Room != null)
            {
                roomDictionary.Add(roomNodeData.Id, roomPlacementData.Room);
            }
        }
        //All rooms have been placed.
        //所有房间已放置完毕。
    }
}