using System;
using System.Collections;
using System.Collections.Generic;
using TMPro;
using UnityEngine;
using UnityEngine.UI;
using UWE;

namespace NitroxClient.MonoBehaviours.Gui.Modals;

/// <summary>
/// Base class for Modal components, which are dialog boxes that appear in the middle of the screen
/// </summary>
public abstract class Modal
{
    /// <summary>
    /// Get a Modal by its type at any time (static)
    /// </summary>
    public static Dictionary<Type, Modal> Modals = new();
    /// <summary>
    /// Current modal that is visible on the screen
    /// </summary>
    public static Modal CurrentModal;

    private GameObject modalSubWindow;
    private TextMeshProUGUI text;

    // All the properties that will be overriden by new instances that inherit this class
    public string SubWindowName { get; init; }
    public string ModalText { get; set; }

    /// <summary>
    /// Makes it possible to dismiss the modal by clicking outside of the modal or pressing escape (default false).
    /// </summary>
    public bool IsAvoidable { get; init; }
    public bool HideNoButton { get; init; }

    public string YesButtonText { get; init; }
    public string NoButtonText { get; init; }

    public bool FreezeGame { get; init; }

    public float Transparency { get; init; }

    public float Height { get; init; }

    // Is useful for calling IngameMenu::OnDeselect() from a modal class (in Hide() for example)
    public bool IsAvoidableBypass = false;

    public Modal(string yesButtonText = "YES", bool hideNoButton = true, string noButtonText = "NO", string modalText = "", bool isAvoidable = false, bool freezeGame = false, float transparency = 0.392f, float height = 195f)
    {
        Type type = GetType();
        if (Modals.ContainsKey(type))
        {
            throw new NotSupportedException($"You cannot set two modals to have the same Type");
        }

        SubWindowName = GetType().Name;
        YesButtonText = yesButtonText;
        HideNoButton = hideNoButton;
        NoButtonText = noButtonText;
        ModalText = modalText;
        IsAvoidable = isAvoidable;
        FreezeGame = freezeGame;
        Transparency = transparency; // 0.392 is the default transparency for Subnautica's modal
        Height = height;

        Log.Debug($"Registered Modal {SubWindowName} of type {type}");
        Modals.Add(type, this);
    }

    /// <summary>
    /// Adds the Modal to the screen
    /// </summary>
    public void Show()
    {
        CoroutineHost.StartCoroutine(ShowAsync());
    }

    public IEnumerator ShowAsync()
    {
        CurrentModal?.Hide();
        CurrentModal = this;
        yield return ShowImplementation();
    }

    /// <summary>
    /// Removes the Modal from the screen
    /// </summary>
    public void Hide()
    {
        CurrentModal = null;
        if (FreezeGame)
        {
            FreezeTime.End(FreezeTime.Id.Quit);
        }
        if (IsAvoidable)
        {
            IngameMenu.main.OnDeselect();
        }
        else
        {
            IsAvoidableBypass = true;
            IngameMenu.main.OnDeselect();
            IsAvoidableBypass = false;
        }
    }

    /// <summary>
    /// Called when this modal is deselected (only when pressing outside of the modal)
    /// </summary>
    public virtual void OnDeselect() { }

    /// <summary>
    /// This creates the modal when showing it for the first time, you can't modify it afterwards
    /// </summary>
    private void InitSubWindow()
    {
        if (!IngameMenu.main)
        {
            throw new NotSupportedException($"Cannot show ingame subwindow {SubWindowName} because the ingame window does not exist.");
        }

        if (!modalSubWindow)
        {
            GameObject derivedSubWindow = IngameMenu.main.transform.Find("QuitConfirmation").gameObject;
            modalSubWindow = UnityEngine.Object.Instantiate(derivedSubWindow, IngameMenu.main.transform, false);
            modalSubWindow.name = SubWindowName;

            // Styling.
            RectTransform main = modalSubWindow.GetComponent<RectTransform>();
            main.sizeDelta = new Vector2(700, Height);

            RectTransform messageTransform = modalSubWindow.FindChild("Header").GetComponent<RectTransform>();
            messageTransform.sizeDelta = new Vector2(700, Height);
            messageTransform.anchoredPosition = new Vector2(0, 50 - Height / 2);
        }

        modalSubWindow.GetComponent<Image>().color = Color.white.WithAlpha(Transparency);

        // Will happen either it's initialized or not
        UpdateModal();
    }

    /// <summary>
    /// Update the modal with informations that may change from one Show() to another
    /// </summary>
    private void UpdateModal()
    {
        text = modalSubWindow.FindChild("Header").GetComponent<TextMeshProUGUI>();
        text.text = ModalText;

        GameObject buttonYesObject = modalSubWindow.FindChild("ButtonYes");
        GameObject buttonNoObject = modalSubWindow.FindChild("ButtonNo");
        Button yesButton = buttonYesObject.GetComponent<Button>();

        // We need to reinitialize onClick to avoid keeping Persisted Events (which are set manually inside Unity's Editor)
        yesButton.onClick = new Button.ButtonClickedEvent();
        yesButton.onClick.AddListener(ClickYes);
        buttonYesObject.GetComponentInChildren<TextMeshProUGUI>().text = YesButtonText;
        RectTransform yesButtonTransform = buttonYesObject.GetComponent<RectTransform>();
        yesButtonTransform.anchoredPosition = new Vector2(yesButtonTransform.anchoredPosition.x, 50f - Height);


        // TODO: fix yes and no button positions
        if (HideNoButton)
        {
            UnityEngine.Object.Destroy(buttonNoObject);
            buttonYesObject.transform.position = new Vector3(modalSubWindow.transform.position.x / 2, buttonYesObject.transform.position.y, buttonYesObject.transform.position.z); // Center Button
            return;
        }

        if (buttonNoObject)
        {
            Button noButton = buttonNoObject.GetComponent<Button>();
            noButton.onClick = new Button.ButtonClickedEvent();
            noButton.onClick.AddListener(ClickNo);
            buttonNoObject.GetComponentInChildren<TextMeshProUGUI>().text = NoButtonText;
            RectTransform noButtonTransform = buttonNoObject.GetComponent<RectTransform>();
            noButtonTransform.anchoredPosition = new Vector2(noButtonTransform.anchoredPosition.x, 50f - Height);
        }
    }

    public virtual void ClickYes() { }
    public virtual void ClickNo() { }

    private IEnumerator ShowImplementation()
    {
        // Execute frame-by-frame to allow UI scripts to initialize.
        InitSubWindow();
        yield return new WaitForEndOfFrame();
        // Equivalent of IngameMenu.main.Open() but without minding for the freeze
        IngameMenu.main.gameObject.SetActive(true);
        IngameMenu.main.Select();
        yield return new WaitForEndOfFrame();
        IngameMenu.main.ChangeSubscreen(SubWindowName);
        yield return new WaitForEndOfFrame();
        if (FreezeGame)
        {
            FreezeTime.Begin(FreezeTime.Id.Quit);
        }
    }

    /// <summary>
    /// Lets you get any existing Modal by its Type
    /// </summary>
    /// <typeparam name="T">The type of the modal to get</typeparam>
    /// <returns>An existing instance of the modal if it already exists, else, a new one</returns>
    public static T Get<T>() where T : Modal
    {
        if (Modals.TryGetValue(typeof(T), out Modal modal))
        {
            return (T)modal;
        }
        // No need to add entry in dictionary as it's done in constructor
        return (T)Activator.CreateInstance(typeof(T));
    }
}