//! A lightweight Rust crate to help you build awesome tools
//!
//! It's designed to be framework-less and relatively simple while providing awesome helper functions for basic tasks that almost any program needs to do. These tasks include reading a config file with multiple paths (user and global), printing with color similar to `println!()` and getting user directories cross-platform.
//!
//! To add it to your dependencies, either run:
//! ```bash
//! cargo add apputils
//! ```
//!
//! Or update your `Cargo.toml`:
//! ```toml
//! [dependencies]
//! apputils = "0.1.0"
//! ```
//!
//!
//! ## Printing with color
//! ```rust
//! use apputils::Colors;
//! use apputils::paintln;
//!
//! paintln!(Colors::White, "I'm white.");
//! paintln!(Colors::Black, "I'm black.");
//! paintln!(Colors::Yellow, "I'm yellow.");
//! paintln!(Colors::Red, "I'm red.");
//! paintln!(Colors::Rgb(35, 170, 242), "I'm #23AAF2.");
//! ```
//!
//! ## Reading config and data files
//! An example with [wallpaper-dl](https://crates.io/crates/wallpaper-dl)'s file structure:
//! ```rust
//! use apputils::config::{Cfg, Appdata};
//! use apputils::dirs::{config_home, data_home};
//!
//! const APP_NAME: &str = "wallpaper-dl";
//! const CONFIG_FILE: &str = "config.toml";
//! const DB_FILE: &str = "wallpapers.toml";
//!
//! let cfg_path = Cfg::path(APP_NAME, CONFIG_FILE);
//! let db_path = Appdata::path(APP_NAME, DB_FILE);
//!
//! assert_eq!(cfg_path, config_home().unwrap().join(APP_NAME).join(CONFIG_FILE)); // e.g. ~/.config/wallpaper-dl/config.toml
//! assert_eq!(db_path, data_home().unwrap().join(APP_NAME).join(DB_FILE));        // e.g. ~/.local/share/wallpaper-dl/wallpapers.toml

use std::fmt;

/// Console Colors
///
/// This enum contains a member for every color, one for True Color via RGB, and a dummy to disable color in-place.
pub enum Colors {
	None,

	Black,
	BlackBold,

	Red,
	RedBold,

	Green,
	GreenBold,

	Yellow,
	YellowBold,

	Blue,
	BlueBold,

	Magenta,
	MagentaBold,

	Cyan,
	CyanBold,

	White,
	WhiteBold,

	Rgb(u8, u8, u8),
	RgbBold(u8, u8, u8)
}

impl Colors {
	/// Pretty [print] an [Iterator]
	///
	/// Pretty prints an [Iterable](IntoIterator) type with the given color and separator.
	pub fn print<I: IntoIterator>(&self, sep: impl fmt::Display, vec: I)
	where
		<I as IntoIterator>::Item: fmt::Display,
	{
		let mut iter = vec.into_iter().peekable();
		while let Some(item) = iter.next() {
			paint!(self, "{item}");
			if iter.peek().is_some() {
				print!("{}", sep);
			}
		}
	}

	/// Pretty [println] an [Iterator]
	///
	/// Like [print](Colors::print) but with a newline.
	pub fn println<I: IntoIterator>(&self, sep: impl fmt::Display, vec: I)
	where
		<I as IntoIterator>::Item: fmt::Display,
	{
		self.print(sep, vec);
		println!();
	}
}

impl From<&Colors> for u8 {
	fn from(val: &Colors) -> Self {
		match val {
			Colors::None => 0,
			Colors::Black | Colors::BlackBold => 30,
			Colors::Red | Colors::RedBold => 31,
			Colors::Green | Colors::GreenBold => 32,
			Colors::Yellow | Colors::YellowBold => 33,
			Colors::Blue | Colors::BlueBold => 34,
			Colors::Magenta | Colors::MagentaBold => 35,
			Colors::Cyan | Colors::CyanBold => 36,
			Colors::White | Colors::WhiteBold => 37,
			Colors::Rgb(_, _, _) | Colors::RgbBold(_, _, _) => 38,
		}
	}
}

impl From<&Colors> for (u8, u8) {
	fn from(val: &Colors) -> Self {
		match val {
			Colors::None
			| Colors::Black
			| Colors::Red
			| Colors::Green
			| Colors::Yellow
			| Colors::Blue
			| Colors::Magenta
			| Colors::Cyan
			| Colors::White
			| Colors::Rgb(_, _, _) => (val.into(), 22),

			Colors::BlackBold
			| Colors::RedBold
			| Colors::GreenBold
			| Colors::YellowBold
			| Colors::BlueBold
			| Colors::MagentaBold
			| Colors::CyanBold
			| Colors::WhiteBold
			| Colors::RgbBold(_, _, _) => (val.into(), 1),
		}
	}
}

impl fmt::Display for Colors {
	fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
		match self {
			Colors::None => write!(f, ""),
			Colors::Rgb(r, g, b) => write!(f, "\x1b[38;2;{};{};{}m", r, g, b),
			Colors::RgbBold(r, g, b) => write!(f, "\x1b[38;2;{};{};{};1m", r, g, b),
			_ => {
				let cc: (u8, u8) = self.into();
				write!(f, "\x1b[{};{}m", cc.0, cc.1)
			}
		}
	}
}

/// [print!] with [Colors]
///
/// Drop-in replacement for the [print!]-macro from [std].
#[macro_export]
macro_rules! paint {
	($color:expr, $($arg:tt)*) => {{
		print!("{}", $color);
		print!($($arg)*);
		print!("\x1b[0m");
	}};
}

/// [println!] with [Colors]
///
/// Drop-in replacement for the [println!]-macro from [std].
/// This macro is just a wrapper around the [paint!]-macro with an added newline.
#[macro_export]
macro_rules! paintln {
	($color:expr, $($arg:tt)*) => {{
		$crate::paint!($color, $($arg)*);
		println!("");
	}};
}

/// Config file helpers
///
/// Functions to aid in loading and managing config files.
/// It consists mostly of neat wrappers.
pub mod config;

/// User environment wrappers
///
/// This submodule's purpose is similar to [dirs](https://crates.io/crates/dirs), [directories](https://crates.io/crates/directories) or [xdg](https://crates.io/crates/xdg).
///
/// It currently just includes the XDG User Directories and a Windows translation of them.
pub mod dirs;