using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading;
using System.Threading.Tasks;
using Sirenix.OdinInspector;
using UnityEngine;

namespace DDD
{
    [CreateAssetMenu(fileName = "RestaurantCustomerStateSo", menuName = "RestaurantState/RestaurantCustomerStateSo")]
    public class RestaurantCustomerStateSo : ScriptableObject, IGameFlowHandler
    {
        [Title("스폰 제어")]
        [Tooltip("플로우 시작 후 첫 손님이 등장하기까지 대기 시간(초)")]
        [SerializeField] private float _firstSpawnDelaySeconds = 5f;
        
        [SerializeField] private Vector3 _spawnPoint = new(5f, 0f, 4f);

        [Title("디버그")]
        [SerializeField] private SpawnSchedule _spawnSchedule;
        
        private GameStateSo _gameStateSo;
        private LevelDataSo _levelDataSo;
        private CustomerDataSo _customerDataSo;
        private CustomerPoolDataSo _customerPoolDataSo;
        
        private ICustomerFactory _iCustomerFactory;
        
        private CancellationTokenSource _spawnLoopCancellationTokenSource;
        
        public async Task OnReadyNewFlow(GameFlowState newFlowState)
        {
            if (newFlowState == GameFlowState.RunRestaurant)
            {
                await InitializeRunRestaurant();
            }
        }

        public Task OnExitCurrentFlow(GameFlowState exitingFlowState)
        {
            if (exitingFlowState == GameFlowState.RunRestaurant)
            {
                _spawnLoopCancellationTokenSource?.Cancel();
                _spawnLoopCancellationTokenSource?.Dispose();
                _spawnLoopCancellationTokenSource = null;
            }
            
            return Task.CompletedTask;
        }

        private async Task InitializeRunRestaurant()
        {
            _gameStateSo = await AssetManager.LoadAsset<GameStateSo>(DataConstants.GameStateSo);
            
            Debug.Assert(_gameStateSo != null, "_gameStateSo is null");
            
            _iCustomerFactory = new CustomerFactory();

            var currentGameLevel = _gameStateSo.GetCurrentLevel();
            if (_levelDataSo == null)
            {
                _levelDataSo = DataManager.Instance.GetDataSo<LevelDataSo>();
            }
            if (_customerDataSo == null)
            {
                _customerDataSo = DataManager.Instance.GetDataSo<CustomerDataSo>();
            }
            if (_customerPoolDataSo == null)
            {
                _customerPoolDataSo = DataManager.Instance.GetDataSo<CustomerPoolDataSo>();
            }
            var currentLevelData = _levelDataSo.GetDataList().FirstOrDefault(data => data.Level == currentGameLevel);
            
            Debug.Assert(currentLevelData != null, "currentLevelData is null");
            
            var normalPool  = _customerPoolDataSo.GetDataById(currentLevelData.CustomerPool);
            var specialPool = _customerPoolDataSo.GetDataById(currentLevelData.SpecialCustomerPool);
            
            _spawnLoopCancellationTokenSource?.Cancel();
            _spawnLoopCancellationTokenSource = new CancellationTokenSource();
            _ = RunSpawnLoopAsync(currentLevelData, normalPool, specialPool, _spawnLoopCancellationTokenSource.Token);
        }
        
        private async Task RunSpawnLoopAsync(LevelData levelData, CustomerPoolData normalPool, CustomerPoolData specialPool, CancellationToken token)
        {
            if (_firstSpawnDelaySeconds > 0)
                await Task.Delay(TimeSpan.FromSeconds(_firstSpawnDelaySeconds), token);

            var scheduleBuilder = CreateBuilder(levelData.SpawnType);
            int randomSeed = Environment.TickCount;

            SpawnSchedule MakeSchedule() => scheduleBuilder.Build(new SpawnScheduleBuildArgs
            {
                NormalIds    = (IReadOnlyList<string>) (normalPool?.ValidCustomers)  ?? Array.Empty<string>(),
                SpecialIds   = (IReadOnlyList<string>) (specialPool?.ValidCustomers) ?? Array.Empty<string>(),
                NormalQuota  = Math.Max(0, normalPool?.CustomerLimitCount  ?? 0),
                SpecialQuota = Math.Max(0, specialPool?.CustomerLimitCount ?? 0),
                Seed         = ++randomSeed
            });

            _spawnSchedule = MakeSchedule();
            float wait = Mathf.Max(0.1f, levelData.CustomerRespawnTime);

            while (token.IsCancellationRequested == false)
            {
                if (_spawnSchedule.TryDequeue(out var customerId) == false) break;

                if (_customerDataSo.TryGetDataById(customerId, out var customerData))
                {
                    var rotation = Quaternion.identity;

                    _ = _iCustomerFactory.CreateAsync(new CustomerSpawnArgs
                    {
                        CustomerDataId   = customerId,
                        CustomerData = customerData,
                        Position     = _spawnPoint,
                        Rotation     = rotation,
                        Parent       = null
                    });
                }

                await Task.Delay(TimeSpan.FromSeconds(wait), token);
            }
        }

        private ISpawnScheduleBuilder CreateBuilder(SpawnType type)
        {
            return type switch
            {
                SpawnType.Random  => new RandomSpawnScheduleBuilder(),
                SpawnType.Regular => new RegularSpawnScheduleBuilder(),
                _ => new RandomSpawnScheduleBuilder()
            };
        }
    }
}