mod consts;
mod game;
mod inputstatus;
mod objects;
mod physics;
mod render;
mod shipbehavior;

use std::path::PathBuf;

use anyhow::Result;
use galactica_content as content;
use winit::{
	event::{Event, KeyboardInput, WindowEvent},
	event_loop::{ControlFlow, EventLoop},
	window::WindowBuilder,
};

fn main() -> Result<()> {
	// TODO: error if missing
	let content = content::Content::load_dir(
		PathBuf::from(consts::CONTENT_ROOT),
		PathBuf::from(consts::TEXTURE_ROOT),
		consts::STARFIELD_TEXTURE_NAME.to_owned(),
	)?;

	pollster::block_on(run(content))?;
	return Ok(());
}

async fn run(content: content::Content) -> Result<()> {
	let event_loop = EventLoop::new();
	let window = WindowBuilder::new().build(&event_loop).unwrap();

	let mut gpu = render::GPUState::new(window, &content).await?;
	let mut game = game::Game::new(content);

	gpu.update_starfield_buffer(&game);

	event_loop.run(move |event, _, control_flow| {
		match event {
			Event::RedrawRequested(window_id) if window_id == gpu.window().id() => {
				game.update();
				match gpu.render(&game) {
					Ok(_) => {}
					// Reconfigure the surface if lost
					Err(wgpu::SurfaceError::Lost) => gpu.resize(&game, gpu.window_size),
					// The system is out of memory, we should probably quit
					Err(wgpu::SurfaceError::OutOfMemory) => *control_flow = ControlFlow::Exit,
					// All other errors (Outdated, Timeout) should be resolved by the next frame
					Err(e) => eprintln!("{:?}", e),
				}
			}

			Event::MainEventsCleared => {
				// RedrawRequested will only trigger once unless we manually
				// request it.
				gpu.window().request_redraw();
			}

			Event::WindowEvent {
				ref event,
				window_id,
			} if window_id == gpu.window.id() => {
				match event {
					WindowEvent::Focused(state) => {
						game.set_paused(!state);
					}
					WindowEvent::CloseRequested => *control_flow = ControlFlow::Exit,
					WindowEvent::KeyboardInput {
						input:
							KeyboardInput {
								state,
								virtual_keycode: Some(key),
								..
							},
						..
					} => game.process_key(state, key),
					WindowEvent::MouseInput { state, button, .. } => {
						game.process_click(state, button);
					}
					WindowEvent::MouseWheel { delta, phase, .. } => {
						game.process_scroll(delta, phase);
					}
					WindowEvent::Resized(physical_size) => {
						gpu.resize(&game, *physical_size);
					}
					WindowEvent::ScaleFactorChanged { new_inner_size, .. } => {
						// new_inner_size is &&mut so we have to dereference it twice
						gpu.resize(&game, **new_inner_size);
					}
					_ => {}
				}
			}
			_ => {}
		}
	});
}