using System;
using System.Collections.Generic;
using Fruitomation.Game.Items;
using Fruitomation.Global;
using UnityEngine;
using Random = UnityEngine.Random;

namespace Fruitomation.Game
{
    public class FruitSpawner : MonoBehaviour
    {
        [Header("Settings")]
        [SerializeField] private int MaxSpawned;
        [SerializeField] private float MinSpawnTime;
        [SerializeField] private float MaxSpawnTime;
        
        [Header("References")]
        [SerializeField] private Transform FruitSpawnParent;
        [SerializeField] private Canvas GameCanvas;

        [Header("Prefabs")]
        [SerializeField] private GameObject BaseItemPrefab;
        [SerializeField] private GameObject ApplePrefab;
        [SerializeField] private GameObject GrapePrefab;
        [SerializeField] private GameObject BananaPrefab;
        [SerializeField] private GameObject MangoPrefab;
        [SerializeField] private GameObject DurianPrefab;
        [SerializeField] private GameObject PitayaPrefab;
        [SerializeField] private GameObject KiwiPrefab;
        [SerializeField] private GameObject BuddhasHandPrefab;

        private static FruitSpawner Instance;

        private float TimeUntilNextSpawn;
        
        private int CurrentItemCount => FruitSpawnParent.childCount;

        private void Awake()
            => Instance = this;
        
        private void Update()
        {
            if (CurrentItemCount <= MaxSpawned && GameStateController.Is(GameState.Simulation))
            {
                TimeUntilNextSpawn -= Time.deltaTime;
                
                if (TimeUntilNextSpawn <= 0f)
                {
                    TimeUntilNextSpawn = Random.Range(MinSpawnTime, MaxSpawnTime);
                    SpawnFruit();
                }
            }
        }

        private void SpawnFruit()
        {
            List<ItemType> unlocked = new() { ItemType.Apple };

            if (UpgradeManager.Is(BasicUpgrade.Grapes))
                unlocked.Add(ItemType.Grape);
            
            if (UpgradeManager.Is(BasicUpgrade.Bananas))
                unlocked.Add(ItemType.Banana);
            
            if (UpgradeManager.Is(BasicUpgrade.Kiwi))
                unlocked.Add(ItemType.Kiwi);
            
            if (UpgradeManager.Is(BasicUpgrade.Mangoes))
                unlocked.Add(ItemType.Mango);
            
            if (UpgradeManager.Is(BasicUpgrade.Durian))
                unlocked.Add(ItemType.Durian);
            
            if (UpgradeManager.Is(BasicUpgrade.BuddhasHand))
                unlocked.Add(ItemType.BuddhasHand);
            
            if (UpgradeManager.Is(BasicUpgrade.Pitayas))
                unlocked.Add(ItemType.Pitaya);
            
            SpawnItem(unlocked[Random.Range(0, unlocked.Count)]);
        }

        public static ItemBehaviour SpawnItem(ItemType item, Vector3? pos = null)
            => Instance.SpawnItemInternal(item, pos);

        private ItemBehaviour SpawnItemInternal(ItemType item, Vector3? pos = null)
        {
            GameObject parent = Instantiate(BaseItemPrefab, FruitSpawnParent);
            ItemBehaviour behaviour = parent.GetComponent<ItemBehaviour>();
            Debug.Assert(behaviour is not null, "Could not find ItemBehaviour");

            if (pos != null)
            {
                parent.transform.position = (Vector3)pos;
            }
            
            behaviour.InitBehaviour(GameCanvas, item);
            return behaviour;
        }
    }
}