/**
 * FIXME: add documentation here !
 */

function Validator() {

    this.runAtom = function (atomName, value) {
        console.log('runAtom input: ', atomName, value);
        var response = this['responseMessage'];

        if (!this['registeredAtoms'][atomName]) {
            response.error = true;
            response.code = this.invalidAtomCode;
            response.message = 'Invalid validation rule: ' + atomName;
            return response;
        }

        if(!this['atom_' + atomName](value)) {
            response.error = true;
            return response;
        }

        return response;
    };

    this.runOption = function (optName, value, args) {
        console.log('runOption input: ', optName, value, args);
        var response = this['responseMessage'];

        if (!this['registeredOptions'][optName]) {
            response.error = true;
            response.code = this.invalidOptionCode;
            response.message = 'Invalid validation rule: ' + optName;
            return response;
        }

        args = (!args) ? [] : args;
        if(!this['option_' + optName](value, args)) {
            response.error = true;
            return response;
        }

        return response;
    };

    this.run = function (atomList, optionList, value) {

        var response = this['responseMessage'];

        if(atomList && atomList.length > 0) {

            for (var i=0; i < atomList.length ;i++) {
                response = this.runAtom(atomList[i], value);
                if (response.error) {
                    return response;
                }
            }
        }

        if (optionList && Object.keys(optionList).length !== 0) {

            for (var key in optionList) {
                if (optionList.hasOwnProperty(key)) {
                    response = this.runOption(key, value, optionList[key]);
                    if (response.error) {
                        return response;
                    }
                }
            }
        }

        return response;
    };

    this.getErrorMapLabel = function() {
        return this['errorMapLabel'];
    };

    this.getResponseObject = function() {
        return this['responseMessage'];
    };


    /**
     * Validator - atoms functions
     */
    this.atom_int = function (val) {
        if (!val) return true;

        return Number(val) === val && val % 1 === 0;
    };

    this.atom_float = function (val) {
        if (!val) return true;

        return Number(val) === val && val % 1 !== 0;
    };

    this.atom_numeric = function (val) {
        if (!val) return true;

        var regex = new RegExp('^[0-9]+$');
        return regex.test(val);
    };

    this.atom_string = function (val) {
        if (!val) return true;

        return (typeof val == 'string' || val instanceof String);
    };

    this.atom_alfanum = function (val) {
        if (!val) return true;

        var regex = new RegExp('^[a-z0-9]+$', 'i');
        return regex.test(val);
    };

    this.atom_object_id = function (val) {
        if (!val) return true;

        return this.atom_numeric(val);
    };

    this.atom_text = function (val) {
        if (!val) return true;

        var regex_notaccept = new RegExp('([\"@><\{\}\[\]\+\/#!~\|\$%\^])');
        return this.atom_string(val) && !(regex_notaccept.test(val));
    };

    this.atom_name = function (val) {
        if (!val) return true;

        return this.atom_text(val) && val.length>=3 && val.length<=64;
    };

    this.atom_email = function (val) {
        if (!val) return true;

        return val.length <= 255 && /^("(?:[\\x00-\\x21\\x23-\\x5B\\x5D-\\x7F]|\\[\\x00-\\x7F])*"|(?:[!#-'*+\-\/-9=\/A-Z^-~]|\\[\\x00-\\x7F])+(?:\.(?:[!#-'*+\-\/-9=\/A-Z^-~]|\\[\\x00-\\x7F])+)*)@((?:[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?\.)+(?:[0-9][0-9-]*)?[a-zA-Z](?:[a-zA-Z0-9-]*[a-zA-Z0-9])?)$/.test(val);
    };

    this.atom_password = function (val) {
        if (!val) return true;

        var PASSWORD_1_RE = /^[!-~]{8,64}$/;
        var PASSWORD_2_RE = /(.)\\1{3,}/i;

        return PASSWORD_1_RE.test(val) && !PASSWORD_2_RE.test(val);
    };

    this.atom_username = function (val) {
        if (!val) return true;

        var regex = new RegExp('^[a-z0-9_.-@-]{1,62}$', 'i');
        return regex.test(val);
    };

    // FIXME !!!
    this.atom_date = function (val) {
        return true;
        //if (!val) return true;

        //var regex = new RegExp('^[12][0-9]{3}\-[01]?[0-9]\-[0-3]?[0-9]$', 'i');
        //return regex.test(val);
    };

    this.atom_activation_id = function (val) {
        if (!val) return true;

        return this.atom_base64(val)
    };

    this.atom_base64 = function (val) {
        if (!val) return true;

        var regex = new RegExp('^[a-z0-9+\/=]+$', 'i');
        return regex.test(val);
    };

    this.atom_jwt = function (val) {
        if (!val) return true;

        var regex = new RegExp('^(?:[a-z0-9+\/=_-]+\.){2}[a-z0-9+\/=_-]+$', 'i');
        return regex.test(val);
    };


    this.registeredAtoms = {

        'int': true,
        'numeric': true,
        'float': true,
        'string': true,
        'alfanum': true,
        'object_id': true,
        'text': true,
        'name': true,
        'date': true,
        'email': true,
        'password': true,
	    'username': true,
        'base64': true,
        'jwt': true,
        'activation_id': true
    };


    /**
     * Validator - options functions
     */
    this.option_notempty = function (val, args) {

        return !!(typeof val != 'undefined' && val);
    };

    this.option_minval = function (val, args) {
        if (this.atom_int(val)) {
            return val >= args[0];
        }
        if (this.atom_string(val)) {
            return val.length >= args[0];
        }
        return false;
    };

    this.option_maxval = function (val, args) {
        if (this.atom_int(val)) {
            return val <= args[0];
        }
        if (this.atom_string(val)) {
            return val.length <= args[0];
        }
        return false;
    };

    this.options_eq = function (val, args) {
        if (this.atom_int(val)) {
            return val == args[0];
        }
        if (this.atom_string(val)) {
            return val.length == args[0];
        }
        return false;
    };

    this.options_neq = function (val, args) {
        if (this.atom_int(val)) {
            return val != args[0];
        }
        if (this.atom_string(val)) {
            return val.length != args[0];
        }
        return false;
    };

    this.options_gt = function (val, args) {
        if (this.atom_int(val)) {
            return val > args[0];
        }
        return false;
    };

    this.options_st = function (val, args) {
        if (this.atom_int(val)) {
            return val < args[0];
        }
        return false;
    };

    this.options_enum = function (val, args) {
        return args.indexOf(val);
    };

    this.registeredOptions = {

        'notempty': true,
        'minlen': true,
        'maxlen': true,
        'eq': true, // equal
        'neq': true, // not equal
        'gt': true, // grater than
        'st': true, // smaller than
        'enum': true // specific matching values
    };

    this.responseMessage = {
        error: false,
        code: 0,
        message: '',
        context: '',
        field: ''
    };

    this.invalidAtomCode = -1;
    this.invalidOptionCode = -2;
    this.errorMapLabel = 'validator';
}