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//! Cursor helper structs (from [https://crates.io/crates/termion](https://crates.io/crates/termion))

use numtoa::NumToA;
use std::fmt;

/// Move cursor left.
#[derive(Copy, Clone, PartialEq, Eq)]
pub struct Left(pub u16);

impl From<Left> for String {
    fn from(this: Left) -> String {
        let mut buf = [0u8; 20];
        ["\x1B[", this.0.numtoa_str(10, &mut buf), "D"].concat()
    }
}

impl fmt::Display for Left {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "\x1B[{}D", self.0)
    }
}

/// Move cursor right.
#[derive(Copy, Clone, PartialEq, Eq)]
pub struct Right(pub u16);

impl From<Right> for String {
    fn from(this: Right) -> String {
        let mut buf = [0u8; 20];
        ["\x1B[", this.0.numtoa_str(10, &mut buf), "C"].concat()
    }
}

impl fmt::Display for Right {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "\x1B[{}C", self.0)
    }
}

/// Move cursor up.
#[derive(Copy, Clone, PartialEq, Eq)]
pub struct Up(pub u16);

impl From<Up> for String {
    fn from(this: Up) -> String {
        let mut buf = [0u8; 20];
        ["\x1B[", this.0.numtoa_str(10, &mut buf), "A"].concat()
    }
}

impl fmt::Display for Up {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "\x1B[{}A", self.0)
    }
}

/// Move cursor down.
#[derive(Copy, Clone, PartialEq, Eq)]
pub struct Down(pub u16);

impl From<Down> for String {
    fn from(this: Down) -> String {
        let mut buf = [0u8; 20];
        ["\x1B[", this.0.numtoa_str(10, &mut buf), "B"].concat()
    }
}

impl fmt::Display for Down {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        write!(f, "\x1B[{}B", self.0)
    }
}

/// Goto some position ((1,1)-based).
#[derive(Copy, Clone, PartialEq, Eq)]
pub struct Goto(pub u16, pub u16);

impl From<Goto> for String {
    fn from(this: Goto) -> String {
        let (mut x, mut y) = ([0u8; 20], [0u8; 20]);
        [
            "\x1B[",
            this.1.numtoa_str(10, &mut x),
            ";",
            this.0.numtoa_str(10, &mut y),
            "H",
        ]
        .concat()
    }
}

impl Default for Goto {
    fn default() -> Goto {
        Goto(1, 1)
    }
}

impl fmt::Display for Goto {
    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
        debug_assert!(self != &Goto(0, 0), "Goto is one-based.");
        write!(f, "\x1B[{};{}H", self.1, self.0)
    }
}