// Search parameters
pub const CORPUS_FILE_NAME: &str = "corpus.txt";

pub const STARTING_LAYOUT_STRING: &str = "
Q W E R T  Y U I O P
A S D F G  H J K L '
Z X C V B  N M , . /
";

pub const NUM_CONTESTANTS: usize = 128;
pub const NUM_PERSIST: usize = 8;

pub const DESIRED_INDEX_USAGE_PERCENT: f32 = 0.15;
pub const fn index_usage_fitness(index_threshold: u32, index_count: u32) -> u32 {
    (index_threshold as i64 - index_count as i64).abs() as u32 / 64
}

// Do not change, code makes assumptions about these
pub const NUM_KEYS: usize = 30;
pub const ROW_LENGTH: usize = 10;

pub const KEY_CHARS: [char; NUM_KEYS] = [
    'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S',
    'T', 'U', 'V', 'W', 'X', 'Y', 'Z', '/', '.', ',', '\'',
];

pub const KEY_TO_FINGER: [usize; NUM_KEYS] = [
    0, 1, 2, 3, 3, 4, 4, 5, 6, 7, 0, 1, 2, 3, 3, 4, 4, 5, 6, 7, 0, 1, 2, 3, 3, 4, 4, 5, 6, 7,
];

pub fn canonicalise(inp: char) -> Option<char> {
    if inp.is_ascii_alphabetic() {
        return Some(inp.to_ascii_uppercase());
    } else {
        match inp {
            '.' => Some('.'),
            '>' => Some('.'),
            ',' => Some(','),
            '<' => Some(','),
            '/' => Some('/'),
            '?' => Some('/'),
            '\'' => Some('\''),
            '"' => Some('\''),
            _ => None,
        }
    }
}