using System.Collections.Generic;
using System.Threading;
using Cysharp.Threading.Tasks;
using UnityEngine;

namespace Stary.Evo.StoryEditor
{
    public class GraphPlayer
    {
        /// <summary>
        /// 剧本名称
        /// </summary>
        public string Name;
        
        /// <summary>
        /// 节点
        /// </summary>
        public List<NodePlayer> Nodes = new();
        
        /// <summary>
        /// 起始节点
        /// </summary>
        public BeginNodePlayer BeginNode;
        /// <summary>
        /// 结束节点
        /// </summary>
        public EndNodePlayer EndNode;

        /// <summary>
        /// 当前进行中的节点
        /// </summary>
        public List<NodePlayer> CurrentNodes = new();

        /// <summary>
        /// 播放完成
        /// </summary>
        public bool Finished;

        /// <summary>
        /// CTS
        /// </summary>
        public CancellationTokenSource Cts = new();

        public GraphPlayer(GraphData data, IResource loader)
        {
            // 检查加载方式
            if (loader.GetType().ToString() != data.resourceType)
            {
                Debug.LogError($"加载方式不匹配，剧本无法加载：{data.name}\n需要的加载方式: {data.resourceType}");
                return;
            }
            
            Name = data.name;
            data.nodes.ForEach(node =>
            {
                switch (node)
                {
                    case BeginNodeData beginNode:
                        Nodes.Add(beginNode.GetPlayer(this));
                        break;
                    case EndNodeData endNode:
                        Nodes.Add(endNode.GetPlayer(this));
                        break;
                    case ScriptParagraphNodeData paraNode:
                        Nodes.Add(paraNode.GetPlayer(this));
                        break;
                    case FlowNodeData flowNode:
                        Nodes.Add(flowNode.GetPlayer(this));
                        break;
                }
            });
            BeginNode = (BeginNodePlayer)Nodes[data.startNodeIndex];
            BeginNode.Connect();
        }
        
        /// <summary>
        /// 执行剧本
        /// </summary>
        public async UniTask Execute()
        {
            // 初始化结束标志
            Finished = false;
            // 执行剧本
            _ = BeginNode.Execute();
            // 等待剧本完成
            await UniTask.WaitUntil(() => Finished);
        }

        /// <summary>
        /// 停止剧本
        /// </summary>
        public void Stop()
        {
            // 取消并重置CancelToken
            Cts.Cancel();
            Cts = new();
            // 标记剧本结束
            Finished = true;
        }
    }
}