use serde::{Deserialize, Serialize};

use crate::ScriptContext;

mod tortuise {
	#[link(wasm_import_module = "tortuise")]
	unsafe extern "C" {
		pub safe fn is_key_pressed_this_frame(context: u64, keycode: u32) -> u32;
	}
}

/// Represents a key.
#[derive(Debug, PartialOrd, PartialEq, Eq, Clone, Copy, Hash, Serialize, Deserialize)]
pub enum KeyCode {
	/// Backspace key (Delete on macOS, Backspace on other platforms).
	Backspace,
	/// Enter key.
	Enter,
	/// Left arrow key.
	Left,
	/// Right arrow key.
	Right,
	/// Up arrow key.
	Up,
	/// Down arrow key.
	Down,
	/// Home key.
	Home,
	/// End key.
	End,
	/// Page up key.
	PageUp,
	/// Page down key.
	PageDown,
	/// Tab key.
	Tab,
	/// Shift + Tab key.
	BackTab,
	/// Delete key. (Fn+Delete on macOS, Delete on other platforms)
	Delete,
	/// Insert key.
	Insert,
	/// F key.
	///
	/// `KeyCode::F(1)` represents F1 key, etc.
	F(u8),
	/// A character.
	///
	/// `KeyCode::Char('c')` represents `c` character, etc.
	Char(char),
	/// Null.
	Null,
	/// Escape key.
	Esc,
}

fn key_code_to_number(key_code: KeyCode) -> u32 {
	match key_code {
		KeyCode::Null => 0,
		KeyCode::Backspace => 1 << 24,
		KeyCode::Enter => 2 << 24,
		KeyCode::Left => 3 << 24,
		KeyCode::Right => 4 << 24,
		KeyCode::Up => 5 << 24,
		KeyCode::Down => 6 << 24,
		KeyCode::Home => 7 << 24,
		KeyCode::End => 8 << 24,
		KeyCode::PageUp => 9 << 24,
		KeyCode::PageDown => 10 << 24,
		KeyCode::Tab => 11 << 24,
		KeyCode::BackTab => 12 << 24,
		KeyCode::Delete => 13 << 24,
		KeyCode::Insert => 14 << 24,
		KeyCode::F(f) => 15 << 24 | f as u32,
		KeyCode::Char(c) => 16 << 24 | c as u32,
		KeyCode::Esc => 17 << 24,
	}
}

impl ScriptContext {
	pub fn is_key_pressed_this_frame(&self, key_code: KeyCode) -> bool {
		tortuise::is_key_pressed_this_frame(self.0, key_code_to_number(key_code)) > 0
	}
}