module.exports = fi => {
    let dni = fi;
    let getLetterDni = dni => {
        const regExpDni = 'TRWAGMYFPDXBNJZSQVHLCKE';
        const letterDni = dni.toUpperCase().substring(0, 1);
        let positionLetter = parseInt(dni) % 23;
        let getLetter = regExpDni.substring(positionLetter + 1, positionLetter);
        switch (letterDni) {
        case 'X': case 'Y': case 'Z':
            positionLetter = parseInt(dni.replace(letterDni, letterDni.charCodeAt(0) - 88)) % 23;
            getLetter = regExpDni.substring(positionLetter + 1, positionLetter);
            console.log(letterDni.charCodeAt(0));
        }
        return getLetter;
    };

    let getDniSpain = (dniNumeric, dniLetter) => {
        let returnValue = false;
        switch (dni.length) {
        case 9:
            if (dniLetter === getLetterDni(dni))
                returnValue = true;
        }
        return returnValue;
    };

    let getDniForeign = (dniNumeric, dniLetter) => {
        let returnValue = false;
        switch (dni.length) {
        case 9:
            if (dniLetter === getLetterDni(dni))
                returnValue = true;
        }
        return returnValue;
    };

    let getDniBusiness = () => {
        if (dni.length == 9)
            return true;
        return false;
    };

    let getDniFrance = dniLetterCountry => {
        let returnValue = false;
        switch (dni.length) {
        case 13:
            if (dniLetter === 'R')
                returnValue = true;
        }
        return returnValue;
    };

    let getDniItaly = dniLetterCountry => {
        let returnValue = false;
        switch (dni.length) {
        case 13:
            if (dniLetter === 'T')
                returnValue = true;
        }
        return returnValue;
    };

    let getDni = () => {
        const dniNumeric = dni.substring(0, 8);
        const dniLetter = dni.substring(8, 9);
        const dniLetterCountry = dni.substring(0, 1);
        const dniLetterAscii = parseInt(dniLetterCountry.charCodeAt(0));
        let dniValue = false;
        switch (true) {
        case (dniLetterAscii >= 88 && dniLetterAscii <= 90): // X-Z
            dniValue = getDniForeign(dniNumeric, dniLetter);
            break;
        case (dniLetterAscii === 66): // B
            dniValue = getDniBusiness();
            break;
        case (dniLetterAscii === 70): // F
            dniValue = getDniFrance(dniLetterCountry);
            break;
        case (dniLetterAscii === 73): // I
            dniValue = getDniItaly(dniLetterCountry);
            break;
        case (dniLetterAscii >= 48 && dniLetterAscii <= 57): // 0- 9
            console.log('dni spain');
            dniValue = getDniSpain(dniNumeric, dniLetter);
            break;
        default:
            console.log('default');
            dniValue = true;
        }
        return dniValue;
    };

    return getDni();
};