use serde::{Deserialize, Serialize};

use crate::ScriptContext;

mod tortuise {
	#[link(wasm_import_module = "tortuise")]
	unsafe extern "C" {
		pub safe fn add_cell(
			context: u64,
			character: u32,
			location: u32,
			z: u32,
			foreground_color: u32,
			background_color: u32,
			underline_color: u32,
			attributes: u32,
		);
		pub safe fn window_size(context: u64) -> u32;
	}
}

#[derive(Debug, Clone, Copy, Default, Eq, PartialEq, Serialize, Deserialize)]
pub struct Cell {
	pub character: char,
	pub foreground_color: Color,
	pub background_color: Color,
	pub underline_color: Color,
	pub attributes: Attributes,
	pub x: u16,
	pub y: u16,
	pub z: u8,
}

#[derive(Debug, Clone, Copy, Default, Eq, PartialEq, Serialize, Deserialize)]
pub struct WindowSize {
	pub rows: u16,
	pub columns: u16,
}

#[derive(
	Copy, Clone, Debug, Default, PartialEq, Eq, Ord, PartialOrd, Hash, Serialize, Deserialize,
)]
pub enum Color {
	/// Resets the terminal color.
	#[default]
	Reset,

	/// Black color.
	Black,

	/// Dark grey color.
	DarkGrey,

	/// Light red color.
	Red,

	/// Dark red color.
	DarkRed,

	/// Light green color.
	Green,

	/// Dark green color.
	DarkGreen,

	/// Light yellow color.
	Yellow,

	/// Dark yellow color.
	DarkYellow,

	/// Light blue color.
	Blue,

	/// Dark blue color.
	DarkBlue,

	/// Light magenta color.
	Magenta,

	/// Dark magenta color.
	DarkMagenta,

	/// Light cyan color.
	Cyan,

	/// Dark cyan color.
	DarkCyan,

	/// White color.
	White,

	/// Grey color.
	Grey,

	/// An RGB color. See [RGB color model](https://en.wikipedia.org/wiki/RGB_color_model) for more info.
	///
	/// Most UNIX terminals and Windows 10 supported only.
	/// See [Platform-specific notes](enum.Color.html#platform-specific-notes) for more info.
	Rgb { r: u8, g: u8, b: u8 },

	/// An ANSI color. See [256 colors - cheat sheet](https://jonasjacek.github.io/colors/) for more info.
	///
	/// Most UNIX terminals and Windows 10 supported only.
	/// See [Platform-specific notes](enum.Color.html#platform-specific-notes) for more info.
	AnsiValue(u8),
}

#[derive(
	Copy, Clone, Debug, Default, PartialEq, Eq, Ord, PartialOrd, Hash, Serialize, Deserialize,
)]
pub struct Attributes(u32);

pub enum Attribute {
	/// Increases the text intensity.
	Bold = 1,
	/// Decreases the text intensity.
	Dim = 2,
	/// Emphasises the text.
	Italic = 4,
	/// Underlines the text.
	Underlined = 8,

	// Other types of underlining
	/// Double underlines the text.
	DoubleUnderlined = 16,
	/// Undercurls the text.
	Undercurled = 32,
	/// Underdots the text.
	Underdotted = 64,
	/// Underdashes the text.
	Underdashed = 128,

	/// Makes the text blinking (< 150 per minute).
	SlowBlink = 256,
	/// Makes the text blinking (>= 150 per minute).
	RapidBlink = 512,
	/// Swaps foreground and background colors.
	Reverse = 1024,
	/// Hides the text (also known as Conceal).
	Hidden = 2048,
	/// Crosses the text.
	CrossedOut = 4096,
	/// Sets the [Fraktur](https://en.wikipedia.org/wiki/Fraktur) typeface.
	///
	/// Mostly used for [mathematical alphanumeric symbols](https://en.wikipedia.org/wiki/Mathematical_Alphanumeric_Symbols).
	Fraktur = 8192,
	/// Makes the text framed.
	Framed = 16384,
	/// Makes the text encircled.
	Encircled = 32768,
	/// Draws a line at the top of the text.
	OverLined = 65536,
}

fn color_to_u32(color: Color) -> u32 {
	match color {
		Color::Reset => 1 << 24,
		Color::Black => 1 << 24 | 1,
		Color::DarkGrey => 1 << 24 | 2,
		Color::Red => 1 << 24 | 3,
		Color::DarkRed => 1 << 24 | 4,
		Color::Green => 1 << 24 | 5,
		Color::DarkGreen => 1 << 24 | 6,
		Color::Yellow => 1 << 24 | 7,
		Color::DarkYellow => 1 << 24 | 8,
		Color::Blue => 1 << 24 | 9,
		Color::DarkBlue => 1 << 24 | 10,
		Color::Magenta => 1 << 24 | 11,
		Color::DarkMagenta => 1 << 24 | 12,
		Color::Cyan => 1 << 24 | 13,
		Color::DarkCyan => 1 << 24 | 14,
		Color::White => 1 << 24 | 15,
		Color::Grey => 1 << 24 | 16,
		Color::AnsiValue(num) => 2 << 24 | num as u32,
		Color::Rgb { r, g, b } => 3 << 24 | ((r as u32) << 16) | ((g as u32) << 8) | (b as u32),
	}
}

impl Attributes {
	pub fn none() -> Self {
		Self(0)
	}

	pub fn with(self, attribute: Attribute) -> Self {
		Self(self.0 | attribute as u32)
	}

	pub fn without(self, attribute: Attribute) -> Self {
		Self(self.0 & !(attribute as u32))
	}

	pub fn set(&mut self, attribute: Attribute) {
		self.0 |= attribute as u32;
	}

	pub fn unset(&mut self, attribute: Attribute) {
		self.0 &= !(attribute as u32)
	}

	pub fn has(self, attribute: Attribute) -> bool {
		self.0 & (attribute as u32) != 0
	}

	pub fn extend(&mut self, attributes: Attributes) {
		self.0 |= attributes.0
	}

	pub fn is_empty(self) -> bool {
		self.0 == 0
	}
}

impl ScriptContext {
	pub fn add_cell(&self, cell: Cell) {
		tortuise::add_cell(
			self.0,
			cell.character as u32,
			(cell.x as u32) << 16 | cell.y as u32,
			cell.z as u32,
			color_to_u32(cell.foreground_color),
			color_to_u32(cell.background_color),
			color_to_u32(cell.underline_color),
			cell.attributes.0,
		);
	}

	pub fn window_size(&self) -> WindowSize {
		let size = tortuise::window_size(self.0);
		WindowSize {
			rows: (size >> 16) as u16,
			columns: (size & 0xffff) as u16,
		}
	}
}