using GameCore.ECS;
using GameCore.ECS.Interfaces;
using GameCore.Events;

namespace GameCore.Interaction;

public class DoorSystem : ISystem
{
    public void Update(World world, float deltaTime)
    {
        var doors = world.GetEntitiesWith<DoorComponent>();
        foreach (var entity in doors)
        {
            var door = world.GetComponent<DoorComponent>(entity);
            if (door == null) continue;

            switch (door.CurrentState)
            {
                case DoorComponent.DoorState.Opening:
                    ApplyMovement(entity, door, world, deltaTime, DoorComponent.DoorState.Open,
                        System.Math.Max(door.OpenSpeed, 0f));
                    break;

                case DoorComponent.DoorState.Closing:
                    ApplyMovement(entity, door, world, -deltaTime, DoorComponent.DoorState.Closed, 0f);
                    break;

                case DoorComponent.DoorState.Open:
                    door.Timer = System.Math.Max(door.OpenSpeed, 0f);
                    door.OpenProgress = 1f;
                    break;

                case DoorComponent.DoorState.Closed:
                case DoorComponent.DoorState.Locked:
                    door.Timer = 0f;
                    door.OpenProgress = 0f;
                    break;
            }
        }
    }

    private void ApplyMovement(Entity entity, DoorComponent door, World world, float delta,
        DoorComponent.DoorState targetState, float targetBoundary)
    {
        var effectiveSpeed = System.Math.Max(door.OpenSpeed, 0f);
        door.Timer = System.Math.Clamp(door.Timer + delta, 0f, effectiveSpeed);

        if (effectiveSpeed > 0f)
            door.OpenProgress = System.Math.Clamp(door.Timer / effectiveSpeed, 0f, 1f);
        else
            door.OpenProgress = door.Timer > 0f ? 1f : 0f;

        if ((!(delta > 0f) || !(door.Timer >= targetBoundary)) &&
            (!(delta < 0f) || !(door.Timer <= targetBoundary))) return;
        
        door.CurrentState = targetState;
        world.PublishEvent(new DoorStateChangedEvent(entity, door.CurrentState));
    }
}