using UnityEngine;
using UnityEngine.UI;

namespace GameFramework
{
    /// <summary>
    /// 游戏结束画面。
    /// 监听 GameManager.onGameOver 事件，显示结束 Canvas 并暂停游戏。
    /// 玩家按确认键或点击按钮后跳转到排行榜场景。
    /// </summary>
    public class GameOverScreen : MonoBehaviour
    {
        [Header("Canvas")]
        [SerializeField] Canvas gameOverCanvas;

        [Header("Button")]
        [SerializeField] Button confirmButton;

        [Header("Audio")]
        [SerializeField] AudioData gameOverSFX;

        [Header("Input")]
        [SerializeField] KeyCode confirmKey = KeyCode.Return;

        void OnEnable()
        {
            GameManager.onGameOver += ShowGameOver;
        }

        void OnDisable()
        {
            GameManager.onGameOver -= ShowGameOver;
        }

        void Start()
        {
            // 初始隐藏
            if (gameOverCanvas != null)
                gameOverCanvas.enabled = false;

            if (confirmButton != null)
                confirmButton.onClick.AddListener(OnConfirmClick);
        }

        void ShowGameOver()
        {
            // 显示结束画面
            if (gameOverCanvas != null)
                gameOverCanvas.enabled = true;

            // 暂停游戏
            if (TimeController.Instance != null)
                TimeController.Instance.Pause();

            // 显示鼠标
            Cursor.visible = true;
            Cursor.lockState = CursorLockMode.None;

            // 选中确认按钮
            if (confirmButton != null)
                confirmButton.Select();

            // 播放音效
            if (AudioManager.Instance != null && gameOverSFX != null)
                AudioManager.Instance.PlaySFX(gameOverSFX);
        }

        void Update()
        {
            // 游戏结束画面可见时，按确认键跳转
            if (gameOverCanvas != null && gameOverCanvas.enabled)
            {
                if (Input.GetKeyDown(confirmKey) || Input.GetKeyDown(KeyCode.Space))
                {
                    OnConfirmClick();
                }
            }
        }

        void OnConfirmClick()
        {
            // 先解除暂停
            if (TimeController.Instance != null)
                TimeController.Instance.Unpause();

            // 跳转到排行榜场景
            if (SceneLoader.Instance != null)
                SceneLoader.Instance.LoadScoringScene();
        }
    }
}