using System.Collections;
using UnityEngine;
using TMPro;
using UnityEngine.SceneManagement;
using UnityEngine.UI;

public class MainMenuManager : MonoBehaviour
{
    public const string MainMenuSceneName = "MainMenu";

    const string CryptoAddressPrefsKey = "MainMenu.CryptoAddress";
    /// <summary>500 CC fee to process a withdrawal.</summary>
    const int WithdrawalFeeCc = 500;
    /// <summary>$20 USD = 20.0 RC, stored in DB as 80 rc coins (4 coins per 1.0 RC).</summary>
    const int MinimumWithdrawalRcCoins = 80;

    [Header("Stats")]
    [SerializeField] private GameObject statsPanel;
    [SerializeField] private TMP_Text usernameText;
    [SerializeField] private TMP_Text ccText;
    [SerializeField] private TMP_Text rcText;

    [Header("Screens")]
    public GameObject mainMenuScreen;
    public GameObject gameModesScreen;
    public GameObject dummyBuyScreen;
    public GameObject withdrawalScreen;
    [Header("Play")]
    public Button btnPlay;
    public TMP_Text rcPlayText;
    public TMP_Text entryFeeTxt;
    public TMP_Text rcPrizeTxt;

    [Header("Dummy Buy")]
    public Button btnBuyUsd5;
    public Button btnBuyUsd20;
    public Button btnBuyUsd50;

    [Header("Withdrawal")]
    public Button btnWithdrawal;
    public Button btnPaste;
    public TMP_InputField inputCryptoAddress;
    public TMP_Text txtWithdrawStatus;
    private bool isCoinBuyInProgress;

    [Header("Audio")]
    public ToggleButton toggleSfx;
    public ToggleButton toggleMusic;

    /// <summary>Default play cost (coin units) if <c>/settings</c> is not loaded yet.</summary>
    const int FallbackEntryFeeCoins = 21;

    int _matchEntryFeeCoins = FallbackEntryFeeCoins;

    public static MainMenuManager instance;

    void Awake()
    {
        if(LoginManager.instance==null){
            SceneManager.LoadScene(0);
        }
        instance = this;
    }

    void Start()
    {
        LoginManager.OnUserDataUpdated += OnUserUpdated;

        usernameText.text = "";
        ccText.text = "";
        rcText.text = "";
        LoginManager.instance.GetUserData((success, error, user) => {
            if (success)
            {
                OnUserUpdated(user);
            }
            else
            {
                if (btnPlay != null)
                    btnPlay.interactable = false;
                if (rcPlayText != null)
                    rcPlayText.text = string.IsNullOrEmpty(error) ? "Could not load profile. Try again." : error;
            }
        });

        btnBuyUsd5.onClick.AddListener(() => OnBuy(RcPack.Usd5));
        btnBuyUsd20.onClick.AddListener(() => OnBuy(RcPack.Usd20));
        btnBuyUsd50.onClick.AddListener(() => OnBuy(RcPack.Usd50));

        if (inputCryptoAddress != null)
        {
            inputCryptoAddress.text = PlayerPrefs.GetString(CryptoAddressPrefsKey, string.Empty);
            inputCryptoAddress.onValueChanged.AddListener(OnCryptoAddressChanged);
        }

        UpdateWithdrawalStatus();

        if (btnPaste != null)
            btnPaste.onClick.AddListener(OnPasteFromClipboard);

        btnPlay.onClick.AddListener(OnPlay);

        toggleSfx.onToggleValueChanged.AddListener(OnToggleSfx);
        toggleMusic.onToggleValueChanged.AddListener(OnToggleMusic);

        toggleSfx.SetIsOn(AudioManager.instance.IsSFXOn());
        toggleMusic.SetIsOn(AudioManager.instance.IsMusicOn());

        if (!LevelLoadManager.BlocksMainMenuSettingsBootstrap)
            StartCoroutine(CoBootstrapSettingsWithoutLoader());
    }

    void OnDestroy(){
        LoginManager.OnUserDataUpdated -= OnUserUpdated;
        toggleSfx.onToggleValueChanged.RemoveListener(OnToggleSfx);
        toggleMusic.onToggleValueChanged.RemoveListener(OnToggleMusic);
    }

    void OnToggleSfx(bool isOn)
    {
        AudioManager.instance.SetSfxVolume(isOn ? 1f : 0f);
    }

    void OnToggleMusic(bool isOn)
    {
        AudioManager.instance.SetMusicVolume(isOn ? 1f : 0f);
    }

    void OnPlay()
    {
        if (LoginManager.CurrentUser == null)
        {
            Debug.LogError("Play blocked: user profile not loaded.");
            return;
        }
        if (LoginManager.CurrentUser.rc < _matchEntryFeeCoins)
        {
            Debug.LogError("Not enough RC to play");
            return;
        }
        if (CupidLobby.instance == null)
        {
            Debug.LogError("Play blocked: CupidLobby is missing from this scene.");
            return;
        }
        CupidLobby.instance.Matchmake();
    }

    void OnCryptoAddressChanged(string value)
    {
        PlayerPrefs.SetString(CryptoAddressPrefsKey, value ?? string.Empty);
        PlayerPrefs.Save();
        UpdateWithdrawalStatus();
    }

    void UpdateWithdrawalStatus(UserData user = null)
    {
        if (txtWithdrawStatus == null)
            return;
        UserData u = user ?? LoginManager.CurrentUser;
        if (u == null)
            return;

        if (inputCryptoAddress != null && string.IsNullOrWhiteSpace(inputCryptoAddress.text))
        {
            txtWithdrawStatus.text = "Enter a valid wallet address to withdraw safely.";
            return;
        }
        if (u.rc < MinimumWithdrawalRcCoins)
        {
            txtWithdrawStatus.text = "Your RC balance is below the minimum withdrawal amount ($20 USD / 20.0 RC).";
            return;
        }
        if (u.cc < WithdrawalFeeCc)
        {
            txtWithdrawStatus.text = "Withdrawal costs 500 CC. Your CC balance is below 500 CC.";
            return;
        }
        txtWithdrawStatus.text = string.Empty;
    }

    void OnPasteFromClipboard()
    {
        if (inputCryptoAddress == null)
            return;
        string clip = GUIUtility.systemCopyBuffer;
        if (!string.IsNullOrEmpty(clip))
            inputCryptoAddress.text = clip;
    }

    void OnBuy(string packId){
        if (isCoinBuyInProgress)
            return;

        isCoinBuyInProgress = true;
        SetCoinBuyButtonsInteractable(false);

        LoginManager.instance.PurchaseRcPack(packId, (success, error) => {
            if(success){
                OnUserUpdated(LoginManager.CurrentUser);
                AudioManager.instance.PlayCoinsSfx();
            }

            isCoinBuyInProgress = false;
            SetCoinBuyButtonsInteractable(true);
        });
    }

    void SetCoinBuyButtonsInteractable(bool interactable)
    {
        if (btnBuyUsd5 != null)
            btnBuyUsd5.interactable = interactable;
        if (btnBuyUsd20 != null)
            btnBuyUsd20.interactable = interactable;
        if (btnBuyUsd50 != null)
            btnBuyUsd50.interactable = interactable;
    }

    

    // Update is called once per frame
    void Update()
    {
        
    }

    void OnUserUpdated(UserData user){
        usernameText.text = user.username;
        ccText.text = user.cc.ToString("N0") + " CC";
        rcText.text = CoinHelper.FormatString(user.rc) + " RC";

        if (LoginManager.CurrentUser.rc < _matchEntryFeeCoins)
        {
            rcPlayText.text = "Not enough RC to play";
            btnPlay.interactable = false;
        }
        else
        {
            rcPlayText.text = "";
            btnPlay.interactable = true;
        }

        UpdateWithdrawalStatus(user);
    }

    /// <summary>Called by <see cref="LevelLoadManager"/> so the loading overlay stays until matchmaker settings are refreshed.</summary>
    public IEnumerator FinishLoadingScreenAndApplySettings()
    {
        yield return CoReadyMatchmakerSettingsThenApply();
    }

    IEnumerator CoBootstrapSettingsWithoutLoader()
    {
        yield return null;
        yield return CoReadyMatchmakerSettingsThenApply();
    }

    IEnumerator CoReadyMatchmakerSettingsThenApply()
    {
        const float endpointWaitSec = 30f;
        float deadline = Time.realtimeSinceStartup + endpointWaitSec;
        while (!Cupid.IsEndpointReady && Time.realtimeSinceStartup < deadline)
            yield return null;

        yield return Cupid.CoRefreshSettings();

        ApplyMatchmakerFeeUi();

        if (LoginManager.CurrentUser != null)
            OnUserUpdated(LoginManager.CurrentUser);
    }

    void ApplyMatchmakerFeeUi()
    {
        if (Cupid.Settings == null)
        {
            _matchEntryFeeCoins = FallbackEntryFeeCoins;
            if (entryFeeTxt != null)
                entryFeeTxt.text = "—";
            if (rcPrizeTxt != null)
                rcPrizeTxt.text = "—";
            return;
        }

        CupidSettings s = Cupid.Settings;
        _matchEntryFeeCoins = s.entry_fee > 0 ? s.entry_fee : FallbackEntryFeeCoins;

        if (entryFeeTxt != null)
        {
            entryFeeTxt.text = s.entry_fee > 0
                ? CoinHelper.FormatString(s.entry_fee) + " RC"
                : "—";
        }
        if (rcPrizeTxt != null)
        {
            rcPrizeTxt.text = s.rc_prize > 0
                ? CoinHelper.FormatString(s.rc_prize) + " RC"
                : "—";
        }
    }


    public void ShowMainMenuScreen(){
        statsPanel.SetActive(true);
        mainMenuScreen.SetActive(true);
        gameModesScreen.SetActive(false);
        dummyBuyScreen.SetActive(false);
        withdrawalScreen.SetActive(false);
    }

    public void ShowGameModesScreen(){
        statsPanel.SetActive(true);
        mainMenuScreen.SetActive(false);
        gameModesScreen.SetActive(true);
        dummyBuyScreen.SetActive(false);
        withdrawalScreen.SetActive(false);
    }

    public void ShowDummyBuyScreen(){
        statsPanel.SetActive(false);
        mainMenuScreen.SetActive(false);
        gameModesScreen.SetActive(false);
        dummyBuyScreen.SetActive(true);
        withdrawalScreen.SetActive(false);
    }

    public void ShowWithdrawalScreen(){
        statsPanel.SetActive(false);
        mainMenuScreen.SetActive(false);
        gameModesScreen.SetActive(false);
        dummyBuyScreen.SetActive(false);
        withdrawalScreen.SetActive(true);
        UpdateWithdrawalStatus();
    }

}