//! The `graphics` crate contains the core functionality for
//! rendering using the `raylib` library.

use std::borrow::Cow;
use std::cell::RefCell;

use dungeon::Dungeon;
use raylib::prelude::*;

use crate::audio::Audio;
use crate::render::Renderer;

mod audio;
mod render;

/// The `KeyCode` type represents different keys being pressed on the users keyboard
pub use raylib::consts::KeyboardKey as KeyCode;

/// The `Error` type used within this crate
pub type Error = Box<dyn std::error::Error>;

/// The `Result` type used witin this crate
pub type Result<T> = std::result::Result<T, crate::Error>;

/// The `WindowBuilder` type allows setting partial options for the window
#[derive(Debug)]
pub struct WindowBuilder<'a> {
	title: Cow<'a, str>,
	width: u16,
	height: u16,
	vsync: bool,
	verbose: bool,
}
impl<'a> WindowBuilder<'a> {
	/// Default window builder
	pub fn new() -> Self {
		Self::default()
	}

	/// Set the window title
	pub fn title(&mut self, title: impl Into<Cow<'a, str>>) -> &mut Self {
		self.title = title.into();
		self
	}

	/// Set the default window width
	pub fn width(&mut self, width: u16) -> &mut Self {
		self.width = width;
		self
	}

	/// Set the default window height
	pub fn height(&mut self, height: u16) -> &mut Self {
		self.height = height;
		self
	}

	/// Toggle vsync support
	pub fn vsync(&mut self, vsync: bool) -> &mut Self {
		self.vsync = vsync;
		self
	}

	/// Toggle verbose logging
	pub fn verbose(&mut self, verbose: bool) -> &mut Self {
		self.verbose = verbose;
		self
	}

	/// Build the window
	pub fn build(&self) -> crate::Result<Window> {
		let mut builder = raylib::init();

		// Set raylib args from builder
		builder.size(self.width.into(), self.height.into());
		builder.title(&self.title);
		builder.resizable();
		if self.vsync {
			builder.vsync();
		}
		if self.verbose {
			builder.log_level(TraceLogLevel::LOG_INFO);
		} else {
			builder.log_level(TraceLogLevel::LOG_WARNING);
		}

		// Set highdpi for wayland (this is only an issue for glfw)
		// Rust binding to not make this accessable
		#[cfg(feature = "wayland")]
		#[cfg(not(feature = "sdl"))]
		unsafe {
			use ffi::ConfigFlags::*;
			ffi::SetConfigFlags(FLAG_WINDOW_HIGHDPI as u32);
		}

		let (mut handle, thread) = builder.build();
		if !handle.is_window_ready() {
			return Err("Raylib window not ready!".into());
		}

		// update window min size
		handle.set_window_min_size(self.width.into(), self.height.into());

		// load audio
		let audio = Audio::load()?;

		// load renderer
		let renderer = Renderer::new(&mut handle, &thread)?;

		Ok(Window {
			handle: RefCell::new(handle),
			thread,
			renderer,
			audio,
		})
	}
}
impl Default for WindowBuilder<'_> {
	fn default() -> Self {
		Self {
			title: Cow::Borrowed("Dungeon Crawl"),
			width: render::RENDER_WIDTH,
			height: render::RENDER_HEIGHT,
			vsync: false,
			verbose: false,
		}
	}
}

/// The `Window` type represents the game window
#[derive(Debug)]
pub struct Window {
	// persistant renderer
	renderer: Renderer,
	// core raylib handles
	handle: RefCell<RaylibHandle>,
	thread: RaylibThread,
	// audio data/subsystem
	audio: Audio,
}
impl Window {
	/// Returns if the window should be closed.
	/// This usually means the 'x' button has been pressed.
	pub fn is_open(&self) -> bool {
		!self.handle.borrow().window_should_close()
	}

	/// Draws the next ingame frame
	pub fn draw_frame(&mut self, dungeon: &Dungeon) {
		self.renderer
			.draw_frame(self.handle.get_mut(), &self.thread, dungeon);
	}

	/// Toggles the debug UI
	pub fn toggle_debug(&mut self) {
		self.renderer.toggle_debug();
	}

	/// Returns the per frame delta time
	pub fn delta_time(&self) -> f32 {
		self.handle.borrow().get_frame_time()
	}

	/// Returns if the provided `KeyCode` has been pressed once
	pub fn is_key_pressed(&self, key: KeyCode) -> bool {
		self.handle.borrow().is_key_pressed(key)
	}

	/// Returns if the provided `KeyCode` is NOT currently pressed
	pub fn is_key_up(&self, key: KeyCode) -> bool {
		self.handle.borrow().is_key_up(key)
	}

	/// Returns if the provided `KeyCode` is currently pressed
	pub fn is_key_down(&self, key: KeyCode) -> bool {
		self.handle.borrow().is_key_down(key)
	}

	/// Get the last key pressed
	pub fn get_key_pressed(&self) -> Option<KeyCode> {
		// We dont want to require a mutable reference
		// to read the last key pressed
		self.handle
			.try_borrow_mut()
			.ok()
			.and_then(|mut h| h.get_key_pressed())
	}

	/// Get audio data for the window
	pub fn audio(&self) -> &Audio {
		&self.audio
	}
}