using Fruitomation.Game;
using UnityEngine.UI;
using UnityEngine;
using System.Linq;
using System;

namespace Fruitomation.UI
{
    public class BasicUpgradeButton : MonoBehaviour
    {
        private enum UpgradeState
        {
            Unlocked,
            Unlockable,
            Viewable,
            Hidden,
        }

        [Header("Settings")]
        [SerializeField] private BasicUpgrade Upgrade;
        [SerializeField] private int UpgradeCost;

        [Header("References")]
        [SerializeField] private BasicUpgradeButton[] RequiredUpgrades;

        private UpgradeState State = UpgradeState.Hidden;
        private Button AttachedButton;
        private Text AttachedText;
        
        private void Awake()
        {
            AttachedText = gameObject.GetComponentInChildren<Text>();
            AttachedButton = GetComponent<Button>();
            
            AttachedButton.onClick.AddListener(() =>
            {
                UpgradeManager.Unlock(Upgrade);
            });

            /* Stops null reference */
            RequiredUpgrades ??= Array.Empty<BasicUpgradeButton>();
        }

        private bool IsUnlockable =>
            RequiredUpgrades.Length == 0 ||
            RequiredUpgrades.All(required => required.IsUnlocked);

        private bool IsViewable =>
            RequiredUpgrades.Length == 0 ||
            RequiredUpgrades.Any(required => required.IsUnlocked);
        
        private void Update()
        {
            if (UpgradeManager.Is(Upgrade))
            {
                State = UpgradeState.Unlocked;
            }
            
            else if (IsUnlockable)
            {
                State = UpgradeState.Unlockable;
            }
            
            else if (IsViewable)
            {
                State = UpgradeState.Viewable;
            }

            else
            {
                State = UpgradeState.Hidden;
            }
            
            //

            AttachedText.text = State == UpgradeState.Hidden
                ? "???"
                : $"{Upgrade.ToString()} [{UpgradeCost}]";
        }
        
        private bool IsUnlocked => State == UpgradeState.Unlocked;
    }
}