using System;
using UnityEngine;
using UnityEngine.InputSystem;

public class GameInput : MonoBehaviour
{
    public static GameInput Instance { get; private set; }

    public enum Binding
    {
        MoveUp,
        MoveDown,
        MoveLeft,
        MoveRight,
        Interact,
        InteractAlternate,
        Pause,
        Gamepad_Interact,
        Gamepad_InteractAlternate,
        Gamepad_Pause
    }

    private const string PlayerPrefsBindings = "InputBindings";
    private static PlayerInputActions playerInputActions;

    private void Awake()
    {
        Instance = this;

        playerInputActions = new();
        if (PlayerPrefs.HasKey(PlayerPrefsBindings))
            playerInputActions.LoadBindingOverridesFromJson(PlayerPrefs.GetString(PlayerPrefsBindings));
        playerInputActions.Player.Enable();

        playerInputActions.Player.Interact.performed += InteractPerformed;
        playerInputActions.Player.InteractAlternate.performed += InteractAlternate_performed;
        playerInputActions.Player.Pause.performed += Pause_performed;
    }

    public event EventHandler OnInteractAction;
    public event EventHandler OnInteractAlternateAction;
    public event EventHandler OnPauseAction;
    public event EventHandler OnBindingRebind;

    private void InteractAlternate_performed(InputAction.CallbackContext obj) =>
        OnInteractAlternateAction?.Invoke(this, System.EventArgs.Empty);

    private void InteractPerformed(InputAction.CallbackContext obj) => OnInteractAction?.Invoke(this, System.EventArgs.Empty);
    private void Pause_performed(InputAction.CallbackContext obj) => OnPauseAction?.Invoke(this, System.EventArgs.Empty);

    public static Vector2 GetMovementVectorNormalized()
    {
        Vector2 inputVector = playerInputActions.Player.Move.ReadValue<Vector2>();
        return inputVector.normalized;
    }

    public string GetBindingText(Binding binding)
    {
        return binding switch
        {
            Binding.MoveUp => playerInputActions.Player.Move.bindings[1].ToDisplayString(),
            Binding.MoveDown => playerInputActions.Player.Move.bindings[2].ToDisplayString(),
            Binding.MoveLeft => playerInputActions.Player.Move.bindings[3].ToDisplayString(),
            Binding.MoveRight => playerInputActions.Player.Move.bindings[4].ToDisplayString(),
            Binding.Interact => playerInputActions.Player.Interact.bindings[0].ToDisplayString(),
            Binding.InteractAlternate => playerInputActions.Player.InteractAlternate.bindings[0].ToDisplayString(),
            Binding.Pause => playerInputActions.Player.Pause.bindings[0].ToDisplayString(),
            Binding.Gamepad_Interact => playerInputActions.Player.Interact.bindings[1].ToDisplayString(),
            Binding.Gamepad_InteractAlternate => playerInputActions.Player.InteractAlternate.bindings[1].ToDisplayString(),
            Binding.Gamepad_Pause => playerInputActions.Player.Pause.bindings[1].ToDisplayString(),
            _ => throw new NotImplementedException(),
        };
    }

    public void RebindBinding(Binding binding, Action onActionRebound)
    {
        playerInputActions.Player.Disable();

        InputAction inputAction;
        int bindingIndex;

        switch (binding)
        {
            default:
            case Binding.MoveUp:
                inputAction = playerInputActions.Player.Move;
                bindingIndex = 1;
                break;
            case Binding.MoveDown:
                inputAction = playerInputActions.Player.Move;
                bindingIndex = 2;
                break;
            case Binding.MoveLeft:
                inputAction = playerInputActions.Player.Move;
                bindingIndex = 3;
                break;
            case Binding.MoveRight:
                inputAction = playerInputActions.Player.Move;
                bindingIndex = 4;
                break;
            case Binding.Interact:
                inputAction = playerInputActions.Player.Interact;
                bindingIndex = 0;
                break;
            case Binding.InteractAlternate:
                inputAction = playerInputActions.Player.InteractAlternate;
                bindingIndex = 0;
                break;
            case Binding.Pause:
                inputAction = playerInputActions.Player.Pause;
                bindingIndex = 0;
                break;
            case Binding.Gamepad_Interact:
                inputAction = playerInputActions.Player.Interact;
                bindingIndex = 1;
                break;
            case Binding.Gamepad_InteractAlternate:
                inputAction = playerInputActions.Player.InteractAlternate;
                bindingIndex = 1;
                break;
            case Binding.Gamepad_Pause:
                inputAction = playerInputActions.Player.Interact;
                bindingIndex = 1;
                break;
        }

        inputAction.PerformInteractiveRebinding(bindingIndex).OnComplete(callback =>
        {
            playerInputActions.Player.Enable();
            onActionRebound();
            PlayerPrefs.SetString(PlayerPrefsBindings, playerInputActions.SaveBindingOverridesAsJson());
            PlayerPrefs.Save();
            OnBindingRebind?.Invoke(this, System.EventArgs.Empty);
        })
            .Start();
    }
}