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

public class ChatBulletView : MonoBehaviour
{
    [SerializeField] GameObject bulletPrefab; // 必须赋值预制体
    [SerializeField] RectTransform bulletContainer;

    [SerializeField] float bulletSpeed = 150f;
    [SerializeField] float position1Y = 220f;
    [SerializeField] Vector2 randomYRange = new Vector2(200f, -200);
    [SerializeField] float safeSpacing = 20f;
    [SerializeField] Color defaultColor = Color.white;

    private ChatBulletItem lastItemOnPos1;
    private float screenWidth;
    private float screenLeftX;
    ChatManager manager { get { return ChatManager.Instance; } }
    private void Awake()
    {
        screenWidth = 750;
        screenLeftX = -screenWidth / 2;
        GameObjectPoolManager.Instance.CacheGameObject(bulletPrefab, 10, false);
    }

    private void Start()
    {
        ChatManager.Instance.OnUpdateTalkEvent += OnUpdateTalkEvent;
    }

    private void OnDestroy()
    {
        ChatManager.Instance.OnUpdateTalkEvent -= OnUpdateTalkEvent;
    }

    private void OnUpdateTalkEvent(ChatChannel channel, TalkData data)
    {
        if (!ChatManager.Instance.GetBulletSetting(channel))
            return;
        // 0-系统 1-日期 2-自己 3-其他玩家
        int type = manager.GetTalkDataType(data);
        if (type == 1)
            return;
        SpawnBullet(channel, type == 0, type == 0 ? data.Content : GetBulletContent(channel, data), data.InfoList);
    }

    private string GetBulletContent(ChatChannel channel, TalkData data)
    {
        switch (channel)
        {
            case ChatChannel.World:
                string serverName = ServerListCenter.Instance.GetServerName((int)data.ServerID);
                return Language.Get("Chat16", serverName, data.Name, data.Content);
            case ChatChannel.Guild:
                return Language.Get("Chat16", Language.Get("ChatTab1"), data.Name, data.Content);
            default:
                return data.Content;
        }
    }


    private void SpawnBullet(ChatChannel channel, bool isSys, string content, ArrayList infoList)
    {
        if (bulletPrefab == null || GameObjectPoolManager.Instance == null)
            return;

        // 【关键修改】从特定对象池获取对象
        GameObject obj = GameObjectPoolManager.Instance.RequestGameObject(bulletPrefab);

        // 【重要】对象池管理器会把父节点设为null，这里必须重设回UI容器
        obj.transform.SetParent(bulletContainer, false);
        obj.transform.localScale = Vector3.one;
        obj.SetActive(true);

        ChatBulletItem item = obj.GetComponent<ChatBulletItem>();
        if (item == null)
            item = obj.AddComponent<ChatBulletItem>();

        Color color = GetChannelColor(channel);
        float spawnY = CalculateSpawnY();
        Vector2 startPos = new Vector2(screenWidth / 2, spawnY);

        item.Init(isSys, content, infoList, color, bulletSpeed, startPos, screenLeftX, bulletPrefab, OnBulletFinish);

        if (Mathf.Abs(spawnY - position1Y) < 1f)
        {
            lastItemOnPos1 = item;
        }
    }

    private float CalculateSpawnY()
    {
        bool pos1Available = true;

        if (lastItemOnPos1 != null && lastItemOnPos1.gameObject.activeSelf)
        {
            // 上一条弹幕还没完全离开右侧安全区
            float spawnX = screenWidth / 2;
            if (lastItemOnPos1.GetRightEdgeX() > spawnX - safeSpacing)
            {
                pos1Available = false;
            }
        }

        if (pos1Available)
        {
            return position1Y;
        }
        else
        {
            return Random.Range(randomYRange.x, randomYRange.y);
        }
    }

    private void OnBulletFinish(ChatBulletItem item)
    {
        if (item == lastItemOnPos1)
        {
            lastItemOnPos1 = null;
        }
    }

    private Color GetChannelColor(ChatChannel channel)
    {
        if (!manager.chatChannelBulletColorDict.TryGetValue(channel, out var color))
            return defaultColor;
        return color;
    }
}