import {validator} from 'vendor';

export const validators = {
    presence: value => {
        if (validator.isEmpty(value))
            throw new Error(`Value can't be empty`);
    },
    absence: value => {
        if (!validator.isEmpty(value))
            throw new Error(`Value should be empty`);
    },
    length: (value, conf) => {
        let options = {
            min: conf.min || conf.is,
            max: conf.max || conf.is
        };
        let val = String(value);
        if (!validator.isLength(val, options)) {
            if (conf.is) {
                throw new Error(`Value should be ${conf.is} characters long`);
            } else if (conf.min && conf.max) {
                throw new Error(`Value should have a length between ${conf.min} and ${conf.max}`);
            } else if (conf.min) {
                throw new Error(`Value should have at least ${conf.min} characters`);
            } else {
                throw new Error(`Value should have at most ${conf.max} characters`);
            }
        }
    },
    numericality: (value, conf) => {
        if (conf.int) {
            if (!validator.isInt(value))
                throw new Error(`Value should be integer`);
        } else if (!validator.isNumeric(value))
            throw new Error(`Value should be a number`);
    },
    inclusion: (value, conf) => {
        if (!validator.isIn(value, conf.in))
            throw new Error(`Invalid value`);
    },
    exclusion: (value, conf) => {
        if (validator.isIn(value, conf.in))
            throw new Error(`Invalid value`);
    },
    format: (value, conf) => {
        if (!validator.matches(value, conf.with))
            throw new Error(`Invalid value`);
    },
    custom: (value, conf) => {
        if (!conf.bindedFunction(value))
            throw new Error(`Invalid value`);
    }
};

/**
 * Checks if value satisfies a set of validations.
 *
 * @param {*} value The value
 * @param {Array} validations Array with validations
 */
export function validateAll(value, validations) {
    for (let conf of validations)
        validate(value, conf);
}

/**
 * Checks if value satisfies a validation.
 *
 * @param {*} value The value
 * @param {Object} conf The validation configuration
 */
export function validate(value, conf) {
    let validator = validators[conf.validation];
    try {
        checkNull(value, conf);

        if (validator && value != null)
            validator(value, conf);
    } catch (e) {
        let message = conf.message ? conf.message : e.message;
        throw new Error(message);
    }
}

/**
 * Checks if value satisfies a blank or not null validation.
 *
 * @param {*} value The value
 * @param {Object} conf The validation configuration
 */
export function checkNull(value, conf) {
    if (conf.allowBlank === false && value === '')
        throw new Error(`Value can't be blank`);
    else if (conf.allowNull === false && value == null)
        throw new Error(`Value can't be null`);
}