using System;
using System.Collections;
using TMPro;
using UnityEngine;
using System.Collections.Generic;
using Unity.VisualScripting;

internal enum KeyType
{
    Number,
    MatchingDice
}

public class Room : MonoBehaviour
{
    [SerializeField] private GameObject numberTextObject;
    [SerializeField] private List<GameObject> adjacentRooms;
    [SerializeField] private bool isEntrance;
    [SerializeField] private KeyType keyType;
    [SerializeField] private int number;
    public event EventHandler<Room> ValidRoomClicked;
    
    bool _isExplored = false;
    private bool _isClickable = true;
    private Color _roomNumberOriginalColor;
    
    private void OnEnable() {
        GameManager.StateChanged += HandleStateChange;
        GameManager.DiceSelected += HandleDiceSelected;
        GameManager.DiceUnselected += HandDiceUnselected;
    }

    private void OnDisable() {
        GameManager.StateChanged -= HandleStateChange;
        GameManager.DiceSelected -= HandleDiceSelected;
        GameManager.DiceUnselected -= HandDiceUnselected;
    }

    // Start is called once before the first execution of Update after the MonoBehaviour is created
    void Start() {
        if (isEntrance) {
            SetPropertiesOfEntrance();
        }
        
        TextMeshProUGUI numberText = numberTextObject.GetComponent<TextMeshProUGUI>();
        _roomNumberOriginalColor = gameObject.GetComponentInChildren<TextMeshProUGUI>().color;
        
        if (keyType == KeyType.Number)
        {
            numberText.SetText(number.ToString());
        }
        else if (keyType == KeyType.MatchingDice)
        {
            numberText.SetText("=");
        }
    }

    public void SetRoomExplored() {
        _isExplored = true;
        UnhighlightRoomAsOption();
        gameObject.GetComponent<SpriteRenderer>().color =
            ColorHelper.AddColorTint(gameObject.GetComponent<SpriteRenderer>().color, Color.grey, 0.5f);
    }

    private void HighlightRoomAsOption()
    {
        gameObject.GetComponentInChildren<TextMeshProUGUI>().color = Color.blue;
    }

    private void UnhighlightRoomAsOption()
    {
        gameObject.GetComponentInChildren<TextMeshProUGUI>().color = _roomNumberOriginalColor;
    }

    void SetPropertiesOfEntrance() {
        gameObject.GetComponent<SpriteRenderer>().color = Color.green;
        isEntrance = true;
    }
    
    void OnMouseDown() {
        if (!_isClickable) return;
        if (IsValidRoomToExplore()) {
            OnValidRoomClicked();
        }
    }

    protected virtual void OnValidRoomClicked() {
        ValidRoomClicked?.Invoke(this, this);
    }

    // Check if the room is valid to be explored. If so trigger the event.
    private bool IsValidRoomToExplore() {
        if (_isExplored) {
            return false;
        }
        
        if (isEntrance) {
            // All entrance rooms are valid to be explored.
            return true;
        }
        else if (HasExploredAdjacentRooms()) {
            // Otherwise the room must have an adjacent room explored.
            return true;
        }
        return false;
    }

    bool HasExploredAdjacentRooms() {
        foreach (GameObject adjacentRoom in adjacentRooms) {
            if (adjacentRoom.GetComponent<Room>()._isExplored)
            {
                return true;
            }
        }
        return false;
    }
    
    public bool TryUnlock(DicePair pair)
    {
        switch (keyType)
        {
            case KeyType.Number:
                if (number == pair.Sum())
                {
                    return true;
                }
                return false;
            case KeyType.MatchingDice:
                if (pair.DoResultsMatch())
                {
                    return true;
                }

                return false;
        }

        return false;
    }

    private void HandleStateChange(GameState state) {
        UnhighlightRoomAsOption();
        switch (state)
        {
            case GameState.PickDiceOne:
            case GameState.PickDiceTwo:
            case GameState.RollDice:
                _isClickable = false;
                break;
            case GameState.PickRoomTwo:
            case GameState.PickRoomOne:
                _isClickable = true;
                break;
        }
    }

    private void HandleDiceSelected(DicePair pair) {
        if (TryUnlock(pair) && IsValidRoomToExplore())
        {
            HighlightRoomAsOption();
        }
    }

    private void HandDiceUnselected() {
        UnhighlightRoomAsOption();
    }
}