const ipv4 = (params) => {
    const ipv4WithMaskPattern = /^(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\/(0|1[0-9]|2[0-9]|3[0-2]|[0-9])$/;
    return (text) => {
        return ipv4WithMaskPattern.test(text);
    }
}

const ipv6 = (params) => {
    const ipv6WithMaskPattern = /(^\s*((([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9]{2}|2[0-4][0-9]|25[0-5]))\s*$)|(^\s*((([0-9A-Fa-f]{1,4}:){7}([0-9A-Fa-f]{1,4}|:))|(([0-9A-Fa-f]{1,4}:){6}(:[0-9A-Fa-f]{1,4}|((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3})|:))|(([0-9A-Fa-f]{1,4}:){5}(((:[0-9A-Fa-f]{1,4}){1,2})|:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3})|:))|(([0-9A-Fa-f]{1,4}:){4}(((:[0-9A-Fa-f]{1,4}){1,3})|((:[0-9A-Fa-f]{1,4})?:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:))|(([0-9A-Fa-f]{1,4}:){3}(((:[0-9A-Fa-f]{1,4}){1,4})|((:[0-9A-Fa-f]{1,4}){0,2}:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:))|(([0-9A-Fa-f]{1,4}:){2}(((:[0-9A-Fa-f]{1,4}){1,5})|((:[0-9A-Fa-f]{1,4}){0,3}:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:))|(([0-9A-Fa-f]{1,4}:){1}(((:[0-9A-Fa-f]{1,4}){1,6})|((:[0-9A-Fa-f]{1,4}){0,4}:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:))|(:(((:[0-9A-Fa-f]{1,4}){1,7})|((:[0-9A-Fa-f]{1,4}){0,5}:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:)))(\/(\d{1,2}|1[0-1]\d|12[0-8]))(%.+)?\s*$)/;


    return (text) => {
        return ipv6WithMaskPattern.test(text);
    }
}

const hostname = (params) => {
    const maxHostnameLength = 253;
    const maxLabelLength = 63;
    const labelRegex = /^[a-zA-Z0-9]([a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?$/;

    return (text) => {
        if (text.length > maxHostnameLength) {
            return false;
        }
        const labels = text.split('.');
        for (const label of labels) {
            if (label.length < 1
                || label.length > maxLabelLength
                || !labelRegex.test(label)) {
                return false;
            }
        }
        return true;
    }
}

const ipv4OrHost = (params) => {
    const hostnameLocal = hostname(params);
    const ipv4Local = ipv4(params);
    return (text) => {
        return ipv4Local(text) || hostnameLocal(text);
    }
}

const ipv4or6 = (params) => {
    const ipv4Local = ipv4(params);
    const ipv6Local = ipv6(params);
    return (text) => {
        return ipv4Local(text) || ipv6Local(text);
    }
}

const frequency = (params) => {
    const factors = {
        "mhz": 1e6,
        "khz": 1e3,
        "hz":  1e1,
        "ghz": 1e9,
    };

    return (text) => {
        const splited = text.split(/(\s+)/);
        const numerator = parseFloat(splited[0]);
        if (splited.length !== 3 || isNaN(numerator)) return false;
        const factor = factors[splited[2].toLowerCase()];
        if (!factor) return false;
        const realFreq = factor * numerator;
        return realFreq >= (params.min || 10*factors.mhz) && realFreq <= (params.max || 1*factors.ghz);
    }
}

export const Validation = {
    ipv4: ipv4,
    ipv6: ipv6,
    ipv4or6: ipv4or6,
    hostname: hostname,
    ipv4OrHost: ipv4OrHost,
    frequency: frequency
};