use std::fmt::{Display, Formatter};
#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)]
pub struct SquareCoordinate {
rank: u8,
file: u8,
}
impl SquareCoordinate {
pub(crate) fn new(rank: u8, file: u8) -> Self {
if rank > 32 {
panic!("A Square cannot have a rank greater than 32. Got {}", rank)
} else if file > 32 {
panic!("A Square cannot have a file greater than 32. Got {}", file)
} else {
Self { rank, file }
}
}
pub fn from_value(value: usize) -> Self {
static VALUE_COORDINATE_MAP: [SquareCoordinate; 32] = [
SquareCoordinate { rank: 0, file: 6 },
SquareCoordinate { rank: 1, file: 7 },
SquareCoordinate { rank: 4, file: 0 },
SquareCoordinate { rank: 5, file: 1 },
SquareCoordinate { rank: 6, file: 2 },
SquareCoordinate { rank: 7, file: 3 },
SquareCoordinate { rank: 0, file: 4 },
SquareCoordinate { rank: 1, file: 5 },
SquareCoordinate { rank: 2, file: 6 },
SquareCoordinate { rank: 3, file: 7 },
SquareCoordinate { rank: 6, file: 0 },
SquareCoordinate { rank: 7, file: 1 },
SquareCoordinate { rank: 0, file: 2 },
SquareCoordinate { rank: 1, file: 3 },
SquareCoordinate { rank: 2, file: 4 },
SquareCoordinate { rank: 3, file: 5 },
SquareCoordinate { rank: 4, file: 6 },
SquareCoordinate { rank: 5, file: 7 },
SquareCoordinate { rank: 0, file: 0 },
SquareCoordinate { rank: 1, file: 1 },
SquareCoordinate { rank: 2, file: 2 },
SquareCoordinate { rank: 3, file: 3 },
SquareCoordinate { rank: 4, file: 4 },
SquareCoordinate { rank: 5, file: 5 },
SquareCoordinate { rank: 6, file: 6 },
SquareCoordinate { rank: 7, file: 7 },
SquareCoordinate { rank: 2, file: 0 },
SquareCoordinate { rank: 3, file: 1 },
SquareCoordinate { rank: 4, file: 2 },
SquareCoordinate { rank: 5, file: 3 },
SquareCoordinate { rank: 6, file: 4 },
SquareCoordinate { rank: 7, file: 5 },
];
VALUE_COORDINATE_MAP[value]
}
pub fn to_value(self) -> Option<usize> {
if self.rank % 2 == 0 {
if self.file % 2 == 0 {
Some(((18 - ((self.file / 2) * 6)) + ((self.rank / 2) * 8)) as usize % 32)
} else {
None
}
} else {
if self.file % 2 == 1 {
let column_value = match self.file {
1 => 19,
3 => 13,
5 => 7,
7 => 1,
_ => unreachable!(),
};
let row_value = match self.file {
1 => 0,
3 => 8,
5 => 16,
7 => 24,
_ => unreachable!(),
};
Some((column_value + row_value) % 32)
} else {
None
}
}
}
}
impl Display for SquareCoordinate {
fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
write!(
f,
"{}{}",
char::from_u32((self.file + b'a') as u32).unwrap(),
self.rank + 1
)
}
}
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