using Godot;
using System;
using PokemonLike.Library.Support;

namespace PokemonLike.Library.Characters;

[GlobalClass]
public partial class CharacterMovement : Node
{
    [Signal]
    public delegate void AnimationEventHandler(string animationType);

    [ExportCategory("Nodes")]
    [Export] public CharacterBody2D Character;
    [Export] public CharacterInput CharacterInput;
    [Export] public CharacterCollisionRayCast CharacterCollisionRayCast;
    
    [ExportCategory("Movement")]
    [Export] public Vector2 TargetPosition = Vector2.Zero;
    [Export] public bool IsWalking = false;
    [Export] public bool CollisionDetected = false;
    
    
    public override void _Ready()
    {
        CharacterInput.Walk += StartWalking;
        CharacterInput.Turn += Turn;
        CharacterCollisionRayCast.Collision += (value) => CollisionDetected = value;
        Logger.Info("Loading character movement component ...");
    }

    public override void _Process(double delta)
    {
        Walk(delta);
    }

    public bool IsMoving() => IsWalking;

    public bool IsColliding() => CollisionDetected;

    public void StartWalking()
    {
        if (!IsMoving() && !IsColliding())
        {
            EmitSignal(SignalName.Animation, "walk");
            TargetPosition = Character.Position + CharacterInput.Direction * Globals.Instance.GRID_SIZE;
            Logger.Debug($"Moving from {Character.Position} to {TargetPosition}");
            IsWalking = true;
        }
    }

    public void Walk(double delta)
    {
        if (IsWalking)
        {
            Character.Position =
                Character.Position.MoveToward(TargetPosition, (float)delta * Globals.Instance.GRID_SIZE * 4);

            if (Character.Position.DistanceTo(TargetPosition) < 1f)
            {
                StopWalking();
            }
        }
        else
        {
            EmitSignal(SignalName.Animation, "idle");
        }
    }

    public void StopWalking()
    {
        IsWalking = false;
        SnapPositionToGrid();
    }

    public void Turn()
    {
        EmitSignal(SignalName.Animation, "turn");
    }

    public void SnapPositionToGrid()
    {
        Character.Position = new Vector2(
            Mathf.Round(Character.Position.X / Globals.Instance.GRID_SIZE) * Globals.Instance.GRID_SIZE,
            Mathf.Round(Character.Position.Y / Globals.Instance.GRID_SIZE) * Globals.Instance.GRID_SIZE
        );
    }
}