using System.Collections.Generic;
using Cielonos.MainGame.Interactions;
using Cielonos.MainGame.Inventory.Collections;
using Cielonos.MainGame.Map;
using Cielonos.MainGame.UI;
using UnityEngine;

namespace Cielonos.MainGame.Rewards
{
    /// <summary>
    /// 将 CombatRewardInstruction 转换为实际奖励效果。
    /// Dispatcher 只负责“发放/生成”，奖励会话的生命周期仍由 RunManager.RunCombatRewardSubmodule 管理。
    /// </summary>
    public static class CombatRewardDispatcher
    {
        private const string CombatRewardSpawnGroup = "CombatReward";

        public static bool Dispatch(CombatRewardContext context, IReadOnlyList<CombatRewardInstruction> rewards)
        {
            bool hasPendingInteractable = false;
            if (rewards == null)
            {
                return false;
            }

            foreach (CombatRewardInstruction reward in rewards)
            {
                if (reward == null || reward.count <= 0)
                {
                    continue;
                }

                switch (reward.type)
                {
                    case CombatRewardInstructionType.RareMaterial:
                        // 即时奖励：直接进入背包，不会阻塞玩家选择下一个节点。
                        GrantRareMaterial(reward, context.rng);
                        break;
                    case CombatRewardInstructionType.SupplyPack:
                    case CombatRewardInstructionType.MechanicalTable:
                        // 交互奖励：生成实体并登记 pending，玩家领取前不能离开当前节点。
                        hasPendingInteractable |= SpawnInteractableReward(reward, context.rng);
                        break;
                }
            }

            return hasPendingInteractable;
        }

        private static void GrantRareMaterial(CombatRewardInstruction reward, System.Random rng)
        {
            int totalAmount = 0;
            for (int i = 0; i < reward.count; i++)
            {
                totalAmount += reward.RollRareMaterial(rng);
            }

            if (totalAmount <= 0)
            {
                return;
            }

            MainGameManager.Player.inventorySc.backpackSm.ObtainItem<RareMaterial>(totalAmount);
            PlayerCanvas.NotificationUIArea?.PushRareMaterial(totalAmount, "战斗奖励");
        }

        private static bool SpawnInteractableReward(CombatRewardInstruction reward, System.Random rng)
        {
            int spawnCount = Mathf.Max(1, reward.count);
            bool spawnedAny = false;

            for (int i = 0; i < spawnCount; i++)
            {
                if (!TryCreateInteractableReward(reward, rng))
                {
                    continue;
                }

                spawnedAny = true;
            }

            return spawnedAny;
        }

        private static bool TryCreateInteractableReward(CombatRewardInstruction reward, System.Random rng)
        {
            string prefabId = reward.ResolveInteractablePrefabId();
            GameObject instance = null;
            CombatRewardSession session = RunManager.Instance?.GetActiveCombatRewardSession();
            int spawnIndex = session?.NextSpawnIndex() ?? 0;
            CombatRewardSpawnRequest spawnRequest = new(
                CombatRewardSpawnGroup,
                spawnIndex,
                1.35f,
                session?.OccupiedSpawnPositions);

            if (ZoneManager.Instance != null)
            {
                ZoneManager.Instance.TrySpawnInteractable(prefabId, spawnRequest, out instance);
            }
            else
            {
                Debug.LogWarning("[CombatRewardDispatcher] ZoneManager.Instance 为空，无法生成 Combat 奖励。");
            }

            if (instance == null)
            {
                Debug.LogWarning($"[CombatRewardDispatcher] 无法在 '{CombatRewardSpawnGroup}' 生成交互奖励 '{prefabId}'。");
                return false;
            }

            ICombatRewardInteractable rewardInteractable = null;
            foreach (MonoBehaviour component in instance.GetComponents<MonoBehaviour>())
            {
                if (component is ICombatRewardInteractable candidate)
                {
                    rewardInteractable = candidate;
                    break;
                }
            }

            if (rewardInteractable == null)
            {
                Debug.LogWarning($"[CombatRewardDispatcher] '{prefabId}' 没有实现 ICombatRewardInteractable。");
                Object.Destroy(instance);
                return false;
            }

            rewardInteractable.SetupCombatReward(reward, rng);
            // 只有成功生成并完成 Setup 的交互奖励才登记 pending，避免阻塞 Run 流程。
            RunManager.Instance?.RegisterPendingCombatReward(instance.transform.position);
            Debug.Log($"[CombatRewardDispatcher] 已在 '{CombatRewardSpawnGroup}' 生成 Combat 奖励 '{prefabId}'。");
            return true;
        }
    }
}