using System;
using UnityEngine;
using Object = UnityEngine.Object;
using System.Collections.Generic;
using Abilities;
using DungeonSelection;
using TMPro;
using Unity.VisualScripting;

public class EndOfGameEventArgs : EventArgs
{
    public EndOfGameEventArgs(
        string message,
        bool died,
        int diamonds,
        int pointsFromHealth,
        int finalScore)
    {
        Message = message;
        Died = died;
        Diamonds = diamonds;
        PointsFromHealth = pointsFromHealth;
        FinalScore = finalScore;
    }
    
    public bool Died { get; private set; }
    public int Diamonds { get; private set; }
    public readonly int DiamondsMultiplier = 3;
    public int PointsFromHealth { get; private set; }
    public int FinalScore { get; private set; }
    public string Message { get; private set; }
}
public enum GameState
{
    RollDice,
    PickRoomOne,
    PickRoomTwo,
    PickDiceOne,
    PickDiceTwo,
}
public class GameManager : MonoBehaviour
{
    [SerializeField] public static GameState State;
    [SerializeField] private GameObject rooms;
    [SerializeField] private DiceRoller diceRoller;
    [SerializeField] private PassManager passManager;
    [SerializeField] private Player player;
    [SerializeField] private DungeonData dungeonData;

    private DicePair _dicePairOne = new();
    private DicePair _dicePairTwo = new();

    private int monstersLeft = 0; // Includes boss monster. Used for detecting end of game.
    public static event Action<GameState> StateChanged;
    public static event Action<DicePair> DiceSelected;
    public static event Action DiceUnselected;
    public static event EventHandler<EndOfGameEventArgs> EndOfGame;

    private void OnEnable()
    {
        MonsterRoom.MonsterRoomExplored += HandleMonsterRoomExplored;
        player.Died += HandlePlayerDied;
    }

    private void OnDisable()
    {
        MonsterRoom.MonsterRoomExplored -= HandleMonsterRoomExplored;
        player.Died -= HandlePlayerDied;
    }

    // Start is called once before the first execution of Update after the MonoBehaviour is created
    void Start()
    {
        DiceRoller.diceRolled += DiceRolled;
        passManager.PassRequested += PassRequested;
        rooms = GameObject.FindWithTag("RoomsParent");
        foreach (Transform roomTransform in rooms.transform)
        {
            Room roomComponent = roomTransform.gameObject.GetComponent<Room>();
            roomComponent.RoomExploredByDice += HandleRoomExploredByDice;
            if (roomComponent is MonsterRoom)
            {
                monstersLeft++;
            }
        }
        foreach (Transform diceTransform in diceRoller.dice.transform)
        {
            diceTransform.gameObject.GetComponent<Die>().DieSelected += HandleDieSelected;
            diceTransform.gameObject.GetComponent<Die>().DieUnselected += HandleDieUnselected;
        }
        StartNewTurn();
    }
    
    private void ChangeState(GameState stateToChangeTo) {
        if (State != stateToChangeTo)
        {
            State = stateToChangeTo;
            StateChanged?.Invoke(State);
        }
    }

    private void StartNewTurn()
    {
        ChangeState(GameState.RollDice);
        diceRoller.Enable();
        diceRoller.ResetDice();
        _dicePairOne = new DicePair();
        _dicePairTwo = new DicePair();
    }

    void HandleRoomExploredByDice(Room room) {
        if (State == GameState.PickRoomOne)
        {
            ChangeState(GameState.PickDiceTwo);
        }
        else
        {
            StartNewTurn();
        }
    }

    private void HandleDieSelected(Die die) {
        switch (State)
        {
            case GameState.PickDiceOne:
                _dicePairOne.SelectDie(die);
                if (_dicePairOne.AreBothDiceSelected())
                {
                    ChangeState(GameState.PickRoomOne);
                    DiceSelected?.Invoke(_dicePairOne);
                }
                break;
            case GameState.PickDiceTwo:
                _dicePairTwo.SelectDie(die);
                if (_dicePairTwo.AreBothDiceSelected())
                {
                    ChangeState(GameState.PickRoomTwo);
                    DiceSelected?.Invoke(_dicePairTwo);
                }
                break;
            default:
                return;
        }
    }

    private void HandleDieUnselected(Die die) {
        switch (State)
        {
            case GameState.PickDiceOne:
            case GameState.PickRoomOne:
                if (State == GameState.PickRoomOne)
                {
                    ChangeState(GameState.PickDiceOne);
                }
                _dicePairOne.UnselectDie(die);
                DiceUnselected?.Invoke();
                break;
            case GameState.PickDiceTwo:
            case GameState.PickRoomTwo:
                if (State == GameState.PickRoomTwo)
                {
                    ChangeState(GameState.PickDiceTwo);
                }
                _dicePairTwo.UnselectDie(die);
                DiceUnselected?.Invoke();
                break;
        }
    }

    private void PassTurn() {
        player.TakeDamage(1);
        StartNewTurn();
    }

    private void DiceRolled(object sender, EventArgs e)
    {
        if (State == GameState.RollDice)
        {
            diceRoller.Disable();
            ChangeState(GameState.PickDiceOne);
        }
    }

    private void PassRequested(object sender, EventArgs e) {
        switch (State)
        {
            case GameState.PickDiceOne:
            case GameState.PickDiceTwo:
            case GameState.PickRoomOne:
            case GameState.PickRoomTwo:
                PassTurn();
                break;
            default:
                return;
        }
    }

    private void HandleMonsterRoomExplored()
    {
        monstersLeft--;
        if (monstersLeft <= 0)
        {
            ResolveEndOfGame(true);
        }
    }

    private void HandlePlayerDied()
    {
        ResolveEndOfGame(false);
    }
    
    private void ResolveEndOfGame(bool allMonstersKilled)
    {
        string message;
        if (allMonstersKilled)
        {
            message = dungeonData.WinMessage;
        }
        else
        {
            message = dungeonData.DieMessage;
        }
        
        int finalScore = CalculateScore();
        Debug.Log($"Final score: {finalScore}");
        EndOfGame?.Invoke(this, new EndOfGameEventArgs(
            message,
            !allMonstersKilled,
            player.GetDiamondCount(),
            player.GetHealthScore(),
            finalScore));
    }

    private int CalculateScore()
    {
        int sum = 0;
        sum += player.GetDiamondCount() * 3;
        sum += player.GetHealthScore();

        return sum;
    }
}