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use types::*;


// Reference: https://www.shodor.org/unchem/basic/nomen/index.html
// Reference: BiNaS 6th edition, table 66C


/// The basic function which converts a number to greek
/// This function should only be called by the public `number_to_greek` function
fn basic_number_to_greek(n: u8, tenplus: bool) -> String {
    if n == 0 {
        panic!("0 can't be converted to greek");
    }

    else if n == 1 && !tenplus  { "mono".to_owned() }
    else if n == 1 && tenplus   { "hen".to_owned()  }

    else if n == 2 && !tenplus  { "di".to_owned() }
    else if n == 2 && tenplus   { "do".to_owned() }

    else if n == 20 && !tenplus { "icosa".to_owned() }
    else if n == 20 && tenplus  { "cosa".to_owned()  }

    else if n == 3  { "tri".to_owned() }
    else if n == 4  { "tetra".to_owned() }
    else if n == 5  { "penta".to_owned() }
    else if n == 6  { "hexa".to_owned() }
    else if n == 7  { "hepta".to_owned() }
    else if n == 8  { "octa".to_owned() }
    else if n == 9  { "nona".to_owned() }
    else if n == 10 { "deca".to_owned() }
    else if n == 11 { "undeca".to_owned() }
    else if n == 12 { "dodeca".to_owned() }
    else if n == 30 { "triaconta".to_owned() }


    else {
        panic!("{} uncalculatable", n.to_string());
    }
}


/// Get the last character of a word
fn last_char(word: &str) -> char {
    word.chars().nth(word.len() - 1).unwrap()
}


/// Convert a number to greek notation
pub fn number_to_greek(n: u8) -> String {
    if n <= 12 || n == 20 || n == 30 {
        basic_number_to_greek(n, false)
    }

    else if n >= 13 && n < 20 {
        basic_number_to_greek(n - 10, true) + "deca"
    }

    else if n > 20 && n < 30 {
        let prefix = basic_number_to_greek(n - 20, true);
        let suffix = if is_vowel!(last_char(&prefix)) { "cosa" } else { "icosa" };

        prefix + suffix
    }

    else if n > 30 && n < 40 {
        basic_number_to_greek(n - 30, true) + "triaconta"
    }

    else if n >= 40 && n < 100 {
        let factor_ten: u8 = n / 10;

        if n == factor_ten*10 {
            basic_number_to_greek(factor_ten, true) + "conta"
        } else {
            basic_number_to_greek(n - factor_ten*10, true) +
                &basic_number_to_greek(factor_ten, true) + "conta"
        }
    }

    else {
        panic!(n.to_string().to_owned() + " uncalculatable");
    }
}


/// Convert a number to roman notaion
pub fn number_to_roman(n: i8) -> String {
    if n < 0 {
        "-".to_owned() + &number_to_roman(-n)
    }

    else if n == 0 { "0".to_owned() }
    else if n == 1 { "I".to_owned() }
    else if n == 2 { "II".to_owned() }
    else if n == 3 { "III".to_owned() }
    else if n == 4 { "IV".to_owned() }
    else if n == 5 { "V".to_owned() }
    else if n == 6 { "VI".to_owned() }
    else if n == 7 { "VII".to_owned() }
    else if n == 8 { "VIII".to_owned() }
    else if n == 9 { "IX".to_owned() }
    else if n == 10 { "X".to_owned() }
    else if n == 11 { "XI".to_owned() }
    else if n == 12 { "XII".to_owned() }
    else if n == 13 { "XIII".to_owned() }
    else if n == 14 { "XIV".to_owned() }
    else if n == 15 { "XV".to_owned() }
    else if n == 16 { "XVI".to_owned() }

    else {
        panic!(n.to_string().to_owned() + " uncalculatable");
    }
}


/// Convert a number to subscript notation
pub fn subscript(n: u8) -> String {
    if n >= 10 {
        return subscript(n / 10) + &subscript(n % 10);
    }

    else if n == 0  { "₀".to_owned() }
    else if n == 1  { "₁".to_owned() }
    else if n == 2  { "₂".to_owned() }
    else if n == 3  { "₃".to_owned() }
    else if n == 4  { "₄".to_owned() }
    else if n == 5  { "₅".to_owned() }
    else if n == 6  { "₆".to_owned() }
    else if n == 7  { "₇".to_owned() }
    else if n == 8  { "₈".to_owned() }
    else if n == 9  { "₉".to_owned() }

    else {
        panic!(n.to_string().to_owned() + " can't be converted to subscript.");
    }
}


/// Convert a number to superscript notation
/// See also ion_superscript
pub fn superscript(n: u8) -> String {
    if n == 0 { "⁰".to_owned() }
    else if n == 1 { "¹".to_owned() }
    else if n == 2 { "²".to_owned() }
    else if n == 3 { "³".to_owned() }
    else if n == 4 { "⁴".to_owned() }
    else if n == 5 { "⁵".to_owned() }
    else if n == 6 { "⁶".to_owned() }
    else if n == 7 { "⁷".to_owned() }
    else if n == 8 { "⁸".to_owned() }
    else if n == 9 { "⁹".to_owned() }

    else if n >= 10 {
        superscript(n / 10) + &superscript(n % 10)
    }

    else {
        panic!(n.to_string().to_owned() + " can't be converted to superscript.");
    }
}


/// Convert a number to ionic superscript notation
/// The difference with normal superscript notation is that the 1 is omitted,
/// also, ionic superscript supports negative numbers (of which the sign
/// is put at the end, instead of at the beginning)
pub fn ion_superscript(n: IonCharge) -> String {
    if n == -1 {
        "⁻".to_owned()
    } else if n == 1 {
        "⁺".to_owned()
    } else if n < 0 {
        superscript((-n) as u8) + &"⁻".to_owned()
    } else if n > 0 {
        superscript(n as u8) + &"⁺".to_owned()
    } else {
        superscript(n as u8)
    }
}