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

public class uRecentGameHistory : MonoBehaviour
{
    private const string SongResourcesPath = "song_songIndex";
    private const int MaxVisibleRecordCount = 5;
    private const float DefaultPrefabScaleRatio = 1.25f;

    [Header("gameobjects")]
    public GameObject gameHistoryPrefab;
    public Transform gameHistoryParent;
    public Transform dGameHistoryParent;
    public GameObject more_gameHistory;

    [Header("layout")]
    public float prefabScaleRatio = DefaultPrefabScaleRatio;

    [Header("buttons")]
    public Button more_gameHistoryButton;
    public Button shut_gameHistoryButton;

    private SongData[] cachedSongs;
    private readonly List<GameObject> previewEntries = new List<GameObject>();
    private readonly List<GameObject> detailEntries = new List<GameObject>();

    private void Start()
    {
        BindButtons();
        if (more_gameHistory != null)
        {
            more_gameHistory.SetActive(false);
        }

        RebuildHistory();
    }

    private void OnDestroy()
    {
        if (more_gameHistoryButton != null)
        {
            more_gameHistoryButton.onClick.RemoveListener(OpenDetailedHistory);
        }

        if (shut_gameHistoryButton != null)
        {
            shut_gameHistoryButton.onClick.RemoveListener(CloseDetailedHistory);
        }
    }

    public void RebuildHistory()
    {
        if (gameHistoryParent == null || gameHistoryPrefab == null)
        {
            return;
        }

        ClearEntries(previewEntries, gameHistoryParent);
        cachedSongs = RuntimeResourcesCache.LoadSongsFromPath(SongResourcesPath);

        var records = RecentPlayHistoryStore.GetRecords();
        if (records == null)
        {
            return;
        }

        int visibleCount = Mathf.Min(records.Count, MaxVisibleRecordCount);
        for (int i = 0; i < visibleCount; i++)
        {
            RecentPlayRecord record = records[i];
            if (record == null)
            {
                continue;
            }

            GameObject instance = Instantiate(gameHistoryPrefab, gameHistoryParent);
            instance.transform.localScale *= prefabScaleRatio;
            previewEntries.Add(instance);
            ghPrefab controller = instance.GetComponent<ghPrefab>();
            if (controller == null)
            {
                continue;
            }

            controller.Setup(record, FindSongById(record.songID));
        }
    }

    private void OpenDetailedHistory()
    {
        if (more_gameHistory != null)
        {
            more_gameHistory.SetActive(true);
        }

        if (dGameHistoryParent == null || gameHistoryPrefab == null)
        {
            return;
        }

        ClearEntries(detailEntries, dGameHistoryParent);
        EnsureSongCache();

        var records = RecentPlayHistoryStore.GetRecords();
        if (records == null)
        {
            return;
        }

        for (int i = 0; i < records.Count; i++)
        {
            RecentPlayRecord record = records[i];
            if (record == null)
            {
                continue;
            }

            GameObject instance = Instantiate(gameHistoryPrefab, dGameHistoryParent);
            detailEntries.Add(instance);

            ghPrefab controller = instance.GetComponent<ghPrefab>();
            if (controller == null)
            {
                continue;
            }

            controller.Setup(record, FindSongById(record.songID));
        }
    }

    private void CloseDetailedHistory()
    {
        ClearEntries(detailEntries, dGameHistoryParent);
        if (more_gameHistory != null)
        {
            more_gameHistory.SetActive(false);
        }
    }

    private SongData FindSongById(int songId)
    {
        if (songId <= 0 || cachedSongs == null)
        {
            return null;
        }

        for (int i = 0; i < cachedSongs.Length; i++)
        {
            SongData song = cachedSongs[i];
            if (song != null && song.songID == songId)
            {
                return song;
            }
        }

        return null;
    }

    private void BindButtons()
    {
        if (more_gameHistoryButton != null)
        {
            more_gameHistoryButton.onClick.RemoveListener(OpenDetailedHistory);
            more_gameHistoryButton.onClick.AddListener(OpenDetailedHistory);
        }

        if (shut_gameHistoryButton != null)
        {
            shut_gameHistoryButton.onClick.RemoveListener(CloseDetailedHistory);
            shut_gameHistoryButton.onClick.AddListener(CloseDetailedHistory);
        }
    }

    private void EnsureSongCache()
    {
        if (cachedSongs == null || cachedSongs.Length == 0)
        {
            cachedSongs = RuntimeResourcesCache.LoadSongsFromPath(SongResourcesPath);
        }
    }

    private static void ClearEntries(List<GameObject> entries, Transform parent)
    {
        for (int i = entries.Count - 1; i >= 0; i--)
        {
            if (entries[i] != null)
            {
                Destroy(entries[i]);
            }
        }

        entries.Clear();

        if (parent == null)
        {
            return;
        }

        for (int i = parent.childCount - 1; i >= 0; i--)
        {
            Destroy(parent.GetChild(i).gameObject);
        }
    }
}