using System;
using System.Collections.Generic;
using Cielonos.Core.Interaction;
using Cielonos.MainGame.Inventory;
using Cielonos.MainGame.Inventory.Collections;
using Cielonos.MainGame.Rewards;
using Cielonos.MainGame.UI;
using Sirenix.OdinInspector;
using UnityEngine;

namespace Cielonos.MainGame.Interactions
{
    /// <summary>
    /// 战斗完成奖励用的一次性补给包。
    /// 候选生成、领取和放弃补偿均由 RewardProfile 驱动。
    /// </summary>
    public class SupplyPack : InteractableObjectBase, ICombatRewardInteractable
    {
        [TitleGroup("Presentation")]
        [SerializeField]
        private GameObject _availableViewPrefab;

        [SerializeField]
        private GameObject _notAvailableTablePrefab;

        [TitleGroup("Reward Profile")]
        [SerializeField]
        private RewardProfile _profile;

        [TitleGroup("Runtime State"), ReadOnly]
        private List<ItemBase> _currentOffers = new();

        [ShowInInspector, ReadOnly]
        private bool _isAvailable;

        private GameObject _currentView;
        private Transform _offerStagingRoot;

        private void Start()
        {
            SetAvailable(_isAvailable);
        }

        private void OnDestroy()
        {
            ClearCurrentOffers();
        }

        protected override void InitializeChoices()
        {
            choices.Add(new InteractionChoice("打开补给包", OpenSupplyPack));
        }

        public void SetupCombatReward(CombatRewardInstruction instruction, System.Random rng)
        {
            Setup();
        }

        private void Setup()
        {
            if (_currentView != null)
            {
                Destroy(_currentView);
            }

            if (_availableViewPrefab != null)
            {
                _currentView = Instantiate(_availableViewPrefab, transform);
            }

            ClearCurrentOffers();
            _isAvailable = GetProfile() != null;
            if (!_isAvailable)
            {
                Debug.LogError("[SupplyPack] RewardProfile is not assigned.");
            }

            RefreshChoiceStates();
            SetAvailable(_isAvailable);
        }

        private void OpenSupplyPack()
        {
            if (!_isAvailable)
            {
                Setup();
                if (!_isAvailable)
                {
                    return;
                }
            }

            if (_currentOffers.Count == 0)
            {
                GenerateOffers();
            }

            RewardProfile profile = GetProfile();
            if (_currentOffers.Count == 0)
            {
                Debug.LogWarning($"[SupplyPack] Profile '{profile?.name ?? "None"}' generated no valid offers.");
                return;
            }

            var page = PlayerCanvas.MainGamePages.rewardChoicePage;
            if (page == null)
            {
                Debug.LogError("[SupplyPack] RewardChoiceUIPage is not registered.");
                return;
            }

            page.SetOffers(_currentOffers, HandleOfferSelected, HandleOfferSkipped);
            page.Open();
        }

        private void GenerateOffers()
        {
            ClearCurrentOffers();
            RewardProfile profile = GetProfile();
            if (profile == null)
            {
                return;
            }

            System.Random rng = RunManager.Instance?.currentRun?.randomizer?.Next() ?? new System.Random();
            _currentOffers = RewardGenerator.GenerateRuntimeOffers(profile, rng, GetOfferStagingRoot(),
                RewardGenerationContext.FromPlayer());
        }

        private void HandleOfferSelected(int index)
        {
            if (index < 0 || index >= _currentOffers.Count)
            {
                return;
            }

            ItemBase selected = _currentOffers[index];
            _currentOffers.RemoveAt(index);
            int amount = selected is ConsumableBase consumable ? consumable.stackAmount : 1;
            NotificationData notification = NotificationUIArea.CreateItemObtainedData(selected, amount);
            MainGameManager.Player.inventorySc.backpackSm.ObtainRewardOffer(selected);
            PlayerCanvas.NotificationUIArea?.Push(notification);
            ClearCurrentOffers();
            CompleteSupplyPack();
        }

        private void HandleOfferSkipped()
        {
            RewardProfile profile = GetProfile();
            System.Random rng = RunManager.Instance?.currentRun?.randomizer?.Next() ?? new System.Random();
            int compensation = profile?.RollSkipCompensation(rng) ?? 0;
            if (compensation > 0)
            {
                MainGameManager.Player.inventorySc.backpackSm.ObtainItem<RareMaterial>(compensation);
            }

            PlayerCanvas.NotificationUIArea?.PushRareMaterial(compensation, "放弃补给");

            ClearCurrentOffers();
            CompleteSupplyPack();
        }

        private void CompleteSupplyPack()
        {
            _isAvailable = false;
            RefreshChoiceStates();
            if (_currentView != null)
            {
                Destroy(_currentView);
            }

            if (_notAvailableTablePrefab != null)
            {
                _currentView = Instantiate(_notAvailableTablePrefab, transform);
            }

            SetExhausted();
            if (RunManager.Instance == null || !RunManager.Instance.TryCompletePendingCombatReward())
            {
                RunManager.Instance?.CompleteCurrentNode();
            }
        }

        private RewardProfile GetProfile()
        {
            return _profile;
        }

        private void RefreshChoiceStates()
        {
            if (choices == null || choices.Count == 0)
            {
                return;
            }

            choices[0].isInteractable = _isAvailable;
        }

        private void SetAvailable(bool available)
        {
            _isAvailable = available;
            RefreshChoiceStates();
            SetInteractable(available);
            if (_currentView != null)
            {
                _currentView.SetActive(available);
            }
        }

        private Transform GetOfferStagingRoot()
        {
            if (_offerStagingRoot != null)
            {
                return _offerStagingRoot;
            }

            GameObject root = new("GeneratedOffers");
            root.transform.SetParent(transform, false);
            root.SetActive(false);
            _offerStagingRoot = root.transform;
            return _offerStagingRoot;
        }

        private void ClearCurrentOffers()
        {
            foreach (ItemBase item in _currentOffers)
            {
                if (item != null)
                {
                    Destroy(item.gameObject);
                }
            }

            _currentOffers.Clear();
        }
    }
}