use redoxfs::Disk;

#[cfg(all(target_arch = "x86", target_os = "none"))]
pub use self::bios::*;

#[cfg(all(target_arch = "x86", target_os = "none"))]
#[macro_use]
mod bios;

#[derive(Clone, Copy, Debug)]
pub enum OsHwDesc {
	Acpi(u64, u64),
	DeviceTree(u64, u64),
	NotFound,
}

#[derive(Clone, Copy, Debug)]
pub enum OsKey {
	Left,
	Right,
	Up,
	Down,
	Backspace,
	Delete,
	Enter,
	Char(char),
	Other,
}

// Keep synced with BootloaderMemoryKind in kernel
#[derive(Clone, Copy, Debug, Eq, PartialEq)]
#[repr(u64)]
pub enum OsMemoryKind {
	Null = 0,
	Free = 1,
	Reclaim = 2,
	Reserved = 3,
}

// Keep synced with BootloaderMemoryEntry in kernel
#[derive(Clone, Copy, Debug)]
#[repr(C, packed(8))]
pub struct OsMemoryEntry {
	pub base: u64,
	pub size: u64,
	pub kind: OsMemoryKind,
}

#[derive(Clone, Copy, Debug)]
pub struct OsVideoMode {
	pub id: u32,
	pub width: u32,
	pub height: u32,
	pub stride: u32,
	pub base: u64,
}

pub trait Os<D: Disk, V: Iterator<Item = OsVideoMode>> {
	fn name(&self) -> &str;

	fn alloc_zeroed_page_aligned(&self, size: usize) -> *mut u8;

	#[allow(dead_code)]
	fn page_size(&self) -> usize;

	fn filesystem(&self, password_opt: Option<&[u8]>) -> syscall::Result<redoxfs::FileSystem<D>>;

	fn hwdesc(&self) -> OsHwDesc;

	fn video_outputs(&self) -> usize;
	fn video_modes(&self, output_i: usize) -> V;
	fn set_video_mode(&self, output_i: usize, mode: &mut OsVideoMode);
	fn best_resolution(&self, output_i: usize) -> Option<(u32, u32)>;

	fn get_key(&self) -> OsKey;

	fn clear_text(&self);
	fn get_text_position(&self) -> (usize, usize);
	fn set_text_position(&self, x: usize, y: usize);
	fn set_text_highlight(&self, highlight: bool);
}