using SLSUtilities.UI;
using UnityEngine;
using Yarn.Unity;

namespace Cielonos.UI
{
    public class DialogUIPage : UIPageBase
    {
        public DialogueRunner dialogueRunner;

        private string _pendingNode;

        /// <summary>
        /// 带参数打开：指定要启动的 Yarn 节点名。
        /// </summary>
        public void Open(string yarnNode)
        {
            _pendingNode = yarnNode;
            Open(); // 调用 base.Open() -> 注册到 UIPageManager -> 自动阻塞游戏输入
        }

        public override void Open()
        {
            base.Open();
            string node = string.IsNullOrEmpty(_pendingNode) ? "Start" : _pendingNode;
            
            if (dialogueRunner != null)
            {
                if (dialogueRunner.IsDialogueRunning)
                {
                    dialogueRunner.Stop();
                }
                dialogueRunner.StartDialogue(node);
            }
            _pendingNode = null;
        }

        protected override void Start()
        {
            base.Start();
            
            // 绑定对话结束时的回调函数，关闭 UI 页面从而释放输入锁定
            if (dialogueRunner != null)
            {
                dialogueRunner.onDialogueComplete.AddListener(OnDialogueComplete);
            }
        }

        private void OnDestroy()
        {
            if (dialogueRunner != null)
            {
                dialogueRunner.onDialogueComplete.RemoveListener(OnDialogueComplete);
            }
        }

        /// <summary>
        /// 对话结束时，由 DialogueRunner 的 onDialogueComplete 事件触发。
        /// </summary>
        public void OnDialogueComplete()
        {
            Close(); // base.Close() -> UIPageManager.UnregisterPage -> 恢复输入锁定
        }
    }
}