/* TRUCS MANQUANT
*   Verifier qu'il y a un nombre pair de caractere hexa dans la ligne correspondante d'une section du fichier source
*   Sinon on ne peut pas automatiquement remplir chaque octect car 2 hexa = 1 octet
*/




/* FORMAT FICHIER.TXT Représentant la mémoire apres éxecution d'un prog
*   PC
*   SP
*   Section_1
*   Section_2
*   ...
*   ...
*   Section_n
*/

/* Chaque section se divise en 3 parties, sur 2 lignes de texte
*  addr ESPACE len
*  content
*/

//content est une suite hexadécimale

//Section dans le fichier, champ String car informations proviennent d'un fichier txt
struct SectionFormat{
    addr: String,
    len: String,
    content: String,
}

//Section dans le programme
struct Section{
    addr: usize, // adresse dans la mémoire
    len: usize, // nombre d'octets de la donnée à addr
    content: Vec<u8>, // la donnée en question
}

/*
* Voir si instanciation d'une structure deplace les valeurs "locales" à la méthode from, je sais plus ....
 */
impl Section{
    fn from(section: &SectionFormat) -> Section {
        let mut content: Vec<u8> = Vec::new();
        let addr: usize = section.addr.parse().unwrap();
        let len: usize = section.len.parse().unwrap();

        let mut tmp_a: char = ' ';
        let mut tmp_b: char = ' ';

        for (i, c) in section.content.chars().enumerate(){

            if i%2 == 0 {
                tmp_a = c;
            }
            else {
                tmp_b = c;
                content.push(two_hex_to_u8(tmp_a,tmp_b));
            }
        }


        Section{addr:addr, len:len, content:content}
    }
}

/*
* Representation de l'etat de la mémoire (apres execution.... a  confirmer), sous forme de sections
*/
struct Mem_Checker{
    pc: usize,
    sp: usize,
    sections: Vec<Section>,
}


impl Mem_Checker{
    /*fn from(path: &String) -> Mem_Checker{

    }*/
}


/*
* c doit etre un caractère hexadécimale
 */
fn one_hex_to_dec(c: char) -> u8 {

    match c {
        'A' | 'a' => 10,
        'B' | 'b' => 11,
        'C' | 'c' => 12,
        'D' | 'd' => 13,
        'E' | 'e' => 14,
        'F' | 'f' => 15,
        _ => {
             let ret : u8 = c.to_digit(10).unwrap() as u8;
            return ret; 
            },
        }
    }

   

fn two_hex_to_u8(c1: char, c2: char) -> u8 {
    let a = one_hex_to_dec(c1);
    let b = one_hex_to_dec(c2);

    16*a + b
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_create_section_content(){
        let section_format = SectionFormat{
            addr: "0".to_string(),
            len: "0".to_string(),
            content: "00FF0AA0A5".to_string(),
        };

        let section = Section::from(&section_format);
        let mut expected_vec:  Vec<u8> = Vec::new();
        expected_vec.push(0u8);
        expected_vec.push(255u8);
        expected_vec.push(10u8);
        expected_vec.push(160u8);
        expected_vec.push(165u8);

        //println!("Vec from created section {:?}", &section.content);
        //println!("Expected vec {:?}", &expected_vec);

        assert_eq!(section.content, expected_vec);
    }





    
    #[test]
    fn test_mod(){
        let cond = (0%2) == 0;
        assert_eq!(true, cond);
    }

    #[test]
    fn test_mod_2(){
        let cond = (1%2) == 1;
        assert_eq!(true, cond);
    }

    #[test]
    fn test_hex_1(){
        let b = two_hex_to_u8('0', '0');
        assert_eq!(0u8, b);
    }

    #[test]
    fn test_hex_2(){
        let b = two_hex_to_u8('F', 'F');
        assert_eq!(255u8, b);
    }

    #[test]
    fn test_hex_3(){
        let b = two_hex_to_u8('0', 'A');
        assert_eq!(10u8, b);
    }

    #[test]
    fn test_hex_4(){
        let b = two_hex_to_u8('A', '0');
        assert_eq!(160u8, b);
    }

    #[test]
    fn test_hex_5(){
        let b = two_hex_to_u8('A', '5');
        assert_eq!(165u8, b);
    }
}