// With the below parameters and the supplied corpus searches seem to converge on a few layouts, with one of the better ones being
// V L O M Z  P F U H ,
// S R A T K  Y C E N I
// X J / D Q  G W ' B .
// Percent per key:
//  0.92  3.96  7.42  2.57  0.06   1.62  2.10  2.77  5.94  1.78
//  6.03  5.56  7.74  8.60  0.77   1.99  2.35 11.90  6.62  6.68
//  0.15  0.15  0.14  4.25  0.10   1.93  2.27  1.00  1.50  1.14
//
// Finger usage:  7.10%,  9.66%, 15.30%, 16.36%, 12.25%, 15.67%, 14.06%,  9.61%
// Hand usage: 48.42% vs 51.58%
// SFB distribution :  0.002%,  0.088%,  0.089%,  0.047%,  0.104%,  0.197%,  0.044%,  0.024%
// DSFB distribution:  0.166%,  0.402%,  0.614%,  1.302%,  0.761%,  0.985%,  1.101%,  0.405%
// Total sfb: 0.595% (50086)
// Total dsfb: 5.736% (482638)

// -----------------------------------------------------------------------------
//                                    Tweak
// -----------------------------------------------------------------------------

// Input parameters
pub const CORPUS_FILE_NAME: &str = "corpus.txt";
pub const STARTING_LAYOUT_STRING: &str = "
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 . , / '
";

// Tournament parameters
pub const NUM_CONTESTANTS: usize = 256;
pub const NUM_PERSIST: usize = 8;
pub const MAX_NUM_TRANSPOSITIONS: usize = 12;

// Fitness parameters
pub const DESIRED_INDEX_USAGE_PERCENT: f32 = 0.12;
pub const STANDARD_DSFB_WEIGHT: f32 = 1.0 / 8.0;
pub const INDEX_DSFB_WEIGHT: f32 = 1.0 / 8.0;
pub fn index_usage_fitness(total_count: u32, index_count: u32) -> f32 {
    let index_perc = index_count as f32 / total_count as f32;
    if index_perc < DESIRED_INDEX_USAGE_PERCENT {
        DESIRED_INDEX_USAGE_PERCENT - index_perc
    } else {
        0.0
    }
}

// -----------------------------------------------------------------------------
//     Do not change the following, the 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<u8> {
    if inp.is_ascii_alphabetic() {
        return Some(inp.to_ascii_uppercase() as u8);
    } else {
        match inp {
            '.' => Some('.' as u8),
            '>' => Some('.' as u8),
            ',' => Some(',' as u8),
            '<' => Some(',' as u8),
            '/' => Some('/' as u8),
            '?' => Some('/' as u8),
            '\'' => Some('\'' as u8),
            '"' => Some('\'' as u8),
            _ => None,
        }
    }
}