using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

namespace GameFramework
{
    /// <summary>
    /// 排行榜场景 UI 控制器。
    /// 如果当前得分能进入 Top-10，先显示输入名字面板；
    /// 否则直接显示排行榜。
    /// 修复了源项目 ScoringUIController 中 ShowScoringScreen() 被调用两次的 bug。
    /// </summary>
    public class ScoringUIController : MonoBehaviour
    {
        [Header("Panels")]
        [SerializeField] GameObject leaderboardPanel;
        [SerializeField] GameObject newHighScorePanel;

        [Header("Leaderboard")]
        [SerializeField] Transform leaderboardContainer; // 包含10个条目的父物体
        [SerializeField] Text finalScoreText;            // 显示当前局最终得分

        [Header("New High Score")]
        [SerializeField] InputField nameInputField;
        [SerializeField] Button submitButton;
        [SerializeField] Button cancelButton;

        [Header("Navigation")]
        [SerializeField] Button mainMenuButton;

        [Header("Audio")]
        [SerializeField] AudioData submitSFX;
        [SerializeField] AudioData cancelSFX;

        void Start()
        {
            // 绑定按钮
            if (submitButton != null)
                submitButton.onClick.AddListener(OnSubmitClick);
            if (cancelButton != null)
                cancelButton.onClick.AddListener(OnCancelClick);
            if (mainMenuButton != null)
                mainMenuButton.onClick.AddListener(OnMainMenuClick);

            // 初始隐藏所有面板
            if (leaderboardPanel != null)
                leaderboardPanel.SetActive(false);
            if (newHighScorePanel != null)
                newHighScorePanel.SetActive(false);

            // 显示当前最终得分
            if (finalScoreText != null && ScoreManager.Instance != null)
                finalScoreText.text = ScoreManager.Instance.CurrentScore.ToString();

            // 判断是否进入排行榜
            // 只调用一次——修复源项目的双重调用 bug
            if (ScoreManager.Instance != null && ScoreManager.Instance.HasNewHighScore)
            {
                ShowNewHighScorePanel();
            }
            else
            {
                ShowLeaderboard();
            }
        }

        /// <summary>
        /// 显示新纪录输入面板。
        /// </summary>
        void ShowNewHighScorePanel()
        {
            if (newHighScorePanel != null)
                newHighScorePanel.SetActive(true);
            if (leaderboardPanel != null)
                leaderboardPanel.SetActive(false);

            // 自动选中输入框
            if (nameInputField != null)
            {
                nameInputField.text = "";
                nameInputField.ActivateInputField();
            }
        }

        /// <summary>
        /// 显示排行榜。
        /// </summary>
        void ShowLeaderboard()
        {
            if (newHighScorePanel != null)
                newHighScorePanel.SetActive(false);
            if (leaderboardPanel != null)
                leaderboardPanel.SetActive(true);

            UpdateLeaderboardDisplay();

            // 选中主菜单按钮（键盘导航用）
            if (mainMenuButton != null)
                mainMenuButton.Select();
        }

        /// <summary>
        /// 更新排行榜显示。
        /// 遍历 leaderboardContainer 下的子物体，设置排名/得分/名字。
        /// 每个条目子物体需要有三个 Text 组件，分别在 Rank/Score/Name 子物体上。
        /// </summary>
        void UpdateLeaderboardDisplay()
        {
            if (ScoreManager.Instance == null) return;
            if (leaderboardContainer == null) return;

            var data = ScoreManager.Instance.LoadPlayerScoreData();
            int count = Mathf.Min(data.list.Count, leaderboardContainer.childCount);

            for (int i = 0; i < leaderboardContainer.childCount; i++)
            {
                Transform entry = leaderboardContainer.GetChild(i);
                bool hasData = i < data.list.Count;

                // 查找条目下的三个 Text
                Text rankText = FindTextByName(entry, "Rank");
                Text scoreText = FindTextByName(entry, "Score");
                Text nameText = FindTextByName(entry, "Name");

                if (hasData)
                {
                    var score = data.list[i];
                    if (rankText != null) rankText.text = $"{i + 1}.";
                    if (scoreText != null) scoreText.text = score.score.ToString();
                    if (nameText != null) nameText.text = score.playerName;
                    entry.gameObject.SetActive(true);
                }
                else
                {
                    if (rankText != null) rankText.text = $"{i + 1}.";
                    if (scoreText != null) scoreText.text = "---";
                    if (nameText != null) nameText.text = "---";
                    entry.gameObject.SetActive(true);
                }
            }
        }

        /// <summary>
        /// 在子物体中按名称查找 Text 组件。
        /// </summary>
        Text FindTextByName(Transform parent, string name)
        {
            Transform t = parent.Find(name);
            if (t != null)
                return t.GetComponent<Text>();
            // 如果条目本身就是单个 Text（没有子结构），返回自身
            return parent.GetComponent<Text>();
        }

        #region Button Handlers
        void OnSubmitClick()
        {
            string playerName = "";
            if (nameInputField != null)
                playerName = nameInputField.text;

            if (string.IsNullOrEmpty(playerName))
                playerName = "Player";

            if (ScoreManager.Instance != null)
                ScoreManager.Instance.SavePlayerScore(playerName);

            if (AudioManager.Instance != null && submitSFX != null)
                AudioManager.Instance.PlaySFX(submitSFX);

            ShowLeaderboard();
        }

        void OnCancelClick()
        {
            // 取消 = 用默认名保存后显示排行榜
            if (ScoreManager.Instance != null)
                ScoreManager.Instance.SavePlayerScore("Player");

            if (AudioManager.Instance != null && cancelSFX != null)
                AudioManager.Instance.PlaySFX(cancelSFX);

            ShowLeaderboard();
        }

        void OnMainMenuClick()
        {
            if (SceneLoader.Instance != null)
                SceneLoader.Instance.LoadMainMenuScene();
        }
        #endregion
    }
}