using CharacterSystem;
using PrizeSystem;
using System;
using System.Collections.Generic;
using System.Linq;
using UnityEngine;
using UnityEngine.Serialization;
using UnityEngine.UI;

public class PrizesSelector : MonoBehaviour, IControlable
{
    public event Action OnConfirmed;

    [SerializeField] private RectTransform _addedPrizesTable;
    [SerializeField] private AvailablePrizesTable _availablePrizesTable;
    [SerializeField] private MSignalButton _selectButton;
    [SerializeField, FormerlySerializedAs("pointer")] private RectTransform _pointer;

    private readonly List<PrizeButton> _addedPrizeButtons = new();
    private PrizeSet _prizeSet;
    private SelectionArea _selectionArea;
    private int _rowIndex;
    private bool _waitForActionRelease;

    public bool ControlsEnabled { get; set; } = true;

    private enum SelectionArea
    {
        Available,
        Added,
        Confirm
    }

    private void Awake()
    {
        _availablePrizesTable.OnPrizeConfigured += OnPrizeConfigured;
        _selectButton.OnClick += Confirm;
    }

    private void OnDestroy()
    {
        _availablePrizesTable.OnPrizeConfigured -= OnPrizeConfigured;
        _selectButton.OnClick -= Confirm;
    }

    public void Open(Character character)
    {
        gameObject.SetActive(true);
        _prizeSet = PrizeSystemManager.PrizeContainer.Sets[character.CharacterIndex];
        RefreshView();

        _selectionArea = _availablePrizesTable.PrizeButtons.Count > 0
            ? SelectionArea.Available
            : GetInitialFallbackArea();
        _rowIndex = 0;
        _waitForActionRelease = In.GetAction(JoystickSide.Both, InteractMode.Continious);
        RebuildLayouts();
        UpdatePointer();
    }

    public void UpdateControls()
    {
        bool actionPressed = In.GetAction(JoystickSide.Both, InteractMode.Continious);
        if (_waitForActionRelease)
        {
            _waitForActionRelease = actionPressed;
            return;
        }

        Vector2Int axes = In.GetAxis(JoystickSide.Both, InteractMode.Discrete);
        NavigateHorizontal(axes.x);
        NavigateVertical(axes.y);
        GetSelectedButton()?.TakeInput(actionPressed);
    }

    private void RefreshView()
    {
        ClearAddedPrizes();
        DisplayAddedPrizes();
        _availablePrizesTable.Refresh(_prizeSet);
    }

    private void DisplayAddedPrizes()
    {
        foreach (Prize prize in _prizeSet.Prizes.Where(prize => prize is not EmptyPrize))
        {
            PrizeButton button = Instantiate(_availablePrizesTable.PrizeButtonPrefab, _addedPrizesTable);
            button.Configure(prize);
            button.OnPrize += _ => RemovePrize(prize);
            _addedPrizeButtons.Add(button);
        }
    }

    private void ClearAddedPrizes()
    {
        _addedPrizeButtons.Clear();
        for (int i = _addedPrizesTable.childCount - 1; i >= 0; i--)
        {
            Transform child = _addedPrizesTable.GetChild(i);
            child.SetParent(null, false);
            Destroy(child.gameObject);
        }
    }

    private void OnPrizeConfigured(Prize prize)
    {
        _prizeSet.Prizes.RemoveAll(item => item is EmptyPrize);
        _prizeSet.Prizes.Add(prize);
        RefreshView();

        _selectionArea = SelectionArea.Added;
        _rowIndex = _addedPrizeButtons.Count - 1;
        _waitForActionRelease = true;
        RebuildLayouts();
        UpdatePointer();
        ControlsPerformer.Instance.SetControlable(this);
    }

    private void RemovePrize(Prize prize)
    {
        _prizeSet.Prizes.Remove(prize);
        EnsureEmptyPrizeWhenNeeded();
        RefreshView();

        _selectionArea = _availablePrizesTable.PrizeButtons.Count > 0
            ? SelectionArea.Available
            : GetInitialFallbackArea();
        _rowIndex = 0;
        _waitForActionRelease = true;
        RebuildLayouts();
        UpdatePointer();
    }

    private void EnsureEmptyPrizeWhenNeeded()
    {
        if (_prizeSet.Prizes.Count == 0)
            _prizeSet.Prizes.Add(new EmptyPrize());
    }

    private void NavigateHorizontal(int direction)
    {
        if (direction < 0 && _availablePrizesTable.PrizeButtons.Count > 0)
        {
            _selectionArea = SelectionArea.Available;
            ClampRowIndex();
            UpdatePointer();
        }
        else if (direction > 0 && _addedPrizeButtons.Count > 0)
        {
            _selectionArea = SelectionArea.Added;
            ClampRowIndex();
            UpdatePointer();
        }
    }

    private void NavigateVertical(int direction)
    {
        if (direction == 0)
            return;

        if (_selectionArea == SelectionArea.Confirm)
        {
            if (direction > 0)
                SelectBottomAvailableRow();
            return;
        }

        int buttonsCount = GetCurrentButtons().Count;
        if (buttonsCount == 0)
        {
            SelectConfirm();
            return;
        }

        if (direction < 0 && _rowIndex == buttonsCount - 1)
            SelectConfirm();
        else
            _rowIndex = Mathf.Clamp(_rowIndex - direction, 0, buttonsCount - 1);

        UpdatePointer();
    }

    private void SelectBottomAvailableRow()
    {
        if (_availablePrizesTable.PrizeButtons.Count > 0)
        {
            _selectionArea = SelectionArea.Available;
            _rowIndex = _availablePrizesTable.PrizeButtons.Count - 1;
        }
        else if (_addedPrizeButtons.Count > 0)
        {
            _selectionArea = SelectionArea.Added;
            _rowIndex = _addedPrizeButtons.Count - 1;
        }

        UpdatePointer();
    }

    private void SelectConfirm()
    {
        _selectionArea = SelectionArea.Confirm;
        _rowIndex = 0;
    }

    private void ClampRowIndex()
    {
        _rowIndex = Mathf.Clamp(_rowIndex, 0, GetCurrentButtons().Count - 1);
    }

    private void UpdatePointer()
    {
        MSignalButton selectedButton = GetSelectedButton();
        if (selectedButton != null)
            _pointer.position = selectedButton.transform.position;
    }

    private void RebuildLayouts()
    {
        Canvas.ForceUpdateCanvases();
        LayoutRebuilder.ForceRebuildLayoutImmediate((RectTransform)_availablePrizesTable.transform);
        LayoutRebuilder.ForceRebuildLayoutImmediate(_addedPrizesTable);
        Canvas.ForceUpdateCanvases();
    }

    private MSignalButton GetSelectedButton()
    {
        if (_selectionArea == SelectionArea.Confirm)
            return _selectButton;

        IReadOnlyList<PrizeButton> buttons = GetCurrentButtons();
        return buttons.Count > 0 ? buttons[_rowIndex] : null;
    }

    private IReadOnlyList<PrizeButton> GetCurrentButtons()
    {
        return _selectionArea == SelectionArea.Added
            ? _addedPrizeButtons
            : _availablePrizesTable.PrizeButtons;
    }

    private SelectionArea GetInitialFallbackArea()
    {
        return _addedPrizeButtons.Count > 0 ? SelectionArea.Added : SelectionArea.Confirm;
    }

    private void Confirm()
    {
        OnConfirmed?.Invoke();
    }
}