use winit::{
	event::{ElementState, KeyEvent, MouseScrollDelta, WindowEvent},
	keyboard::{KeyCode, PhysicalKey},
};

use crate::camera::Camera;

pub struct CameraController {
	speed: f32,
	cursor: (f64, f64),
	forward: f32,
}

impl CameraController {
	pub fn new(speed: f32) -> Self {
		Self {
			speed,
			cursor: (0.0, 0.0),
			forward: 0.0,
		}
	}

	pub fn process_events(&mut self, event: &WindowEvent) -> bool {
		match event {
			WindowEvent::CursorMoved { position, .. } => {
				self.cursor = (position.x, position.y);
				true
			}
			WindowEvent::MouseWheel { delta, .. } => match delta {
				MouseScrollDelta::LineDelta(_, y) => {
					self.forward = *y;
					true
				}
				_ => false,
			},
			_ => false,
		}
	}

	pub fn update_camera(&mut self, camera: &mut Camera) {
		use cgmath::InnerSpace;

		let forward = camera.target - camera.eye;
		let forward_norm = forward.normalize();

		if self.forward > 0.0 {
			camera.eye += forward_norm * self.speed;
		}
		else if self.forward < 0.0 {
			camera.eye -= forward_norm * self.speed;
		}

		camera.eye.x = (self.cursor.0 as f32 / 1920.0) - 0.5;
		camera.eye.y = (-self.cursor.1 as f32 / 1080.0) + 0.5;

		camera.target.x = (self.cursor.0 as f32 / 1920.0) - 0.5;
		camera.target.y = (-self.cursor.1 as f32 / 1080.0) + 0.5;

		self.forward = 0.0;
	}
}