using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Events;

public class BlackjackGameManager : MonoBehaviour
{
    [Header("UI")]
    [SerializeField] private UIController ui;
    [SerializeField] private GameObject blackjackCanvas;

    [Header("Game Settings")]
    [SerializeField] private int maxCardCount = 4;
    [SerializeField] private int startCardCount = 2;

    [Header("Score Settings")]
    [SerializeField] private int blackjackScore = 21;
    [SerializeField] private int successScore = 18;
    [SerializeField] private int normalScore = 15;

    [Header("Events")]
    [SerializeField] private UnityEvent onSuccess;
    [SerializeField] private UnityEvent onFail;
    [SerializeField] private UnityEvent onExit;

    private readonly List<int> playerCards = new List<int>();
    private int currentScore;
    private bool isGameOver;

    private void Start()
    {
        StartGame();
    }

    public void StartGame()
    {
        playerCards.Clear();
        currentScore = 0;
        isGameOver = false;

        if (ui != null)
        {
            ui.ClearUI();
            ui.SetTurn("Player Turn");
        }

        for (int i = 0; i < startCardCount; i++)
        {
            DrawCard();
        }

        CheckAutoResult();
    }

    public void OnHitClicked()
    {
        if (isGameOver)
            return;

        if (playerCards.Count >= maxCardCount)
        {
            FinishByStand();
            return;
        }

        DrawCard();
        CheckAutoResult();
    }

    public void OnStandClicked()
    {
        if (isGameOver)
            return;

        FinishByStand();
    }

    public void OnRestartClicked()
    {
        StartGame();
    }

    public void OnExitClicked()
    {
        if (blackjackCanvas != null)
            blackjackCanvas.SetActive(false);

        onExit?.Invoke();
    }

    private void DrawCard()
    {
        int cardValue = Random.Range(1, 11);

        playerCards.Add(cardValue);
        currentScore += cardValue;

        if (ui != null)
        {
            ui.SetCardsByValues(playerCards);
            ui.SetScore(currentScore);
        }
    }

    private void CheckAutoResult()
    {
        if (currentScore > blackjackScore)
        {
            FinishGame(
                "BUST!",
                $"ÇöÀç Á¡¼ö : {currentScore}\n21À» ÃÊ°úÇß½À´Ï´Ù.",
                false
            );
            return;
        }

        if (currentScore == blackjackScore)
        {
            FinishGame(
                "BLACKJACK!",
                $"ÇöÀç Á¡¼ö : {currentScore}\nÁ¤È®È÷ 21ÀÔ´Ï´Ù!\nº¸»ó ȹµæ!",
                true
            );
            return;
        }

        if (playerCards.Count >= maxCardCount)
        {
            FinishByStand();
        }
    }

    private void FinishByStand()
    {
        if (currentScore > blackjackScore)
        {
            FinishGame(
                "BUST!",
                $"ÃÖÁ¾ Á¡¼ö : {currentScore}\n21À» ÃÊ°úÇß½À´Ï´Ù.",
                false
            );
            return;
        }

        if (currentScore == blackjackScore)
        {
            FinishGame(
                "BLACKJACK!",
                $"ÃÖÁ¾ Á¡¼ö : {currentScore}\n¿Ïº®ÇÕ´Ï´Ù!\nº¸»ó ȹµæ!",
                true
            );
            return;
        }

        if (currentScore >= successScore)
        {
            FinishGame(
                "¼º°ø!",
                $"ÃÖÁ¾ Á¡¼ö : {currentScore}\n21¿¡ ¾ÆÁÖ °¡±õ½À´Ï´Ù.\nº¸»ó ȹµæ!",
                true
            );
            return;
        }

        if (currentScore >= normalScore)
        {
            FinishGame(
                "º¸Åë",
                $"ÃÖÁ¾ Á¡¼ö : {currentScore}\n³ª»ÚÁö ¾ÊÀº ¼±ÅÃÀÔ´Ï´Ù.",
                false
            );
            return;
        }

        FinishGame(
            "½ÇÆÐ",
            $"ÃÖÁ¾ Á¡¼ö : {currentScore}\nÁ¡¼ö°¡ ³Ê¹« ³·½À´Ï´Ù.",
            false
        );
    }

    private void FinishGame(string title, string description, bool isSuccess)
    {
        isGameOver = true;

        if (ui != null)
        {
            ui.ShowResult(title, description);
        }

        if (isSuccess)
        {
            onSuccess?.Invoke();
        }
        else
        {
            onFail?.Invoke();
        }
    }
}