using System.Collections.Generic;
using UnityEngine;

namespace Cielonos.MainGame.Rewards
{
    /// <summary>
    /// 一次 Combat 节点奖励结算的运行时会话。
    /// 用于记录已生成的交互奖励位置和待领取数量，防止玩家在奖励未处理完时进入下一个节点。
    /// </summary>
    public class CombatRewardSession
    {
        private readonly List<Vector3> _occupiedSpawnPositions = new();
        private int _pendingCount;
        private int _spawnIndex;

        public CombatRewardSession(CombatRewardContext context)
        {
            Context = context;
            IsActive = true;
        }

        public CombatRewardContext Context { get; }
        public bool IsActive { get; private set; }
        public int PendingCount => _pendingCount;
        public IReadOnlyList<Vector3> OccupiedSpawnPositions => _occupiedSpawnPositions;

        public int NextSpawnIndex()
        {
            // 与 ZoneManager 的 SpawnGroup 索引配合，让多个奖励按固定序号寻找出生点。
            return _spawnIndex++;
        }

        public void RegisterPendingReward(Vector3 spawnPosition)
        {
            // 交互奖励实体生成成功后登记，领取时再 Resolve。
            _pendingCount++;
            _occupiedSpawnPositions.Add(spawnPosition);
        }

        public bool ResolvePendingReward()
        {
            if (_pendingCount <= 0)
            {
                return false;
            }

            _pendingCount--;
            return true;
        }

        public void End()
        {
            IsActive = false;
            _pendingCount = 0;
            _occupiedSpawnPositions.Clear();
        }
    }
}