import {ValidationResult, ValidatorFunction} from "./types";
import {isJSON} from '../../util'

/**
 * String-related validation rules.
 */
export namespace Str {
    const regexes: {[key: string]: RegExp} = {
        'string.is.alpha': /[a-zA-Z]*/,
        'string.is.alpha_num': /[a-zA-Z0-9]*/,
        'string.is.alpha_dash': /[a-zA-Z\-]*/,
        'string.is.alpha_score': /[a-zA-Z_]*/,
        'string.is.alpha_num_dash_score': /[a-zA-Z\-_0-9]*/,
        'string.is.email': /(?:[a-z0-9!#$%&'*+/=?^_`{|}~-]+(?:\.[a-z0-9!#$%&'*+/=?^_`{|}~-]+)*|"(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21\x23-\x5b\x5d-\x7f]|\\[\x01-\x09\x0b\x0c\x0e-\x7f])*")@(?:(?:[a-z0-9](?:[a-z0-9-]*[a-z0-9])?\.)+[a-z0-9](?:[a-z0-9-]*[a-z0-9])?|\[(?:(?:(2(5[0-5]|[0-4][0-9])|1[0-9][0-9]|[1-9]?[0-9]))\.){3}(?:(2(5[0-5]|[0-4][0-9])|1[0-9][0-9]|[1-9]?[0-9])|[a-z0-9-]*[a-z0-9]:(?:[\x01-\x08\x0b\x0c\x0e-\x1f\x21-\x5a\x53-\x7f]|\\[\x01-\x09\x0b\x0c\x0e-\x7f])+)])/,
        'string.is.ip': /((^\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*$)|(^\s*((([0-9A-Fa-f]{1,4}:){7}([0-9A-Fa-f]{1,4}|:))|(([0-9A-Fa-f]{1,4}:){6}(:[0-9A-Fa-f]{1,4}|((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3})|:))|(([0-9A-Fa-f]{1,4}:){5}(((:[0-9A-Fa-f]{1,4}){1,2})|:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3})|:))|(([0-9A-Fa-f]{1,4}:){4}(((:[0-9A-Fa-f]{1,4}){1,3})|((:[0-9A-Fa-f]{1,4})?:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:))|(([0-9A-Fa-f]{1,4}:){3}(((:[0-9A-Fa-f]{1,4}){1,4})|((:[0-9A-Fa-f]{1,4}){0,2}:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:))|(([0-9A-Fa-f]{1,4}:){2}(((:[0-9A-Fa-f]{1,4}){1,5})|((:[0-9A-Fa-f]{1,4}){0,3}:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:))|(([0-9A-Fa-f]{1,4}:){1}(((:[0-9A-Fa-f]{1,4}){1,6})|((:[0-9A-Fa-f]{1,4}){0,4}:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:))|(:(((:[0-9A-Fa-f]{1,4}){1,7})|((:[0-9A-Fa-f]{1,4}){0,5}:((25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)(\.(25[0-5]|2[0-4]\d|1\d\d|[1-9]?\d)){3}))|:)))(%.+)?\s*$))/,
        'string.is.ip.v4': /(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]?)){3}/,
        'string.is.ip.v6': /(([0-9a-fA-F]{1,4}:){7}[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,7}:|([0-9a-fA-F]{1,4}:){1,6}:[0-9a-fA-F]{1,4}|([0-9a-fA-F]{1,4}:){1,5}(:[0-9a-fA-F]{1,4}){1,2}|([0-9a-fA-F]{1,4}:){1,4}(:[0-9a-fA-F]{1,4}){1,3}|([0-9a-fA-F]{1,4}:){1,3}(:[0-9a-fA-F]{1,4}){1,4}|([0-9a-fA-F]{1,4}:){1,2}(:[0-9a-fA-F]{1,4}){1,5}|[0-9a-fA-F]{1,4}:((:[0-9a-fA-F]{1,4}){1,6})|:((:[0-9a-fA-F]{1,4}){1,7}|:)|fe80:(:[0-9a-fA-F]{0,4}){0,4}%[0-9a-zA-Z]+|::(ffff(:0{1,4})?:)?((25[0-5]|(2[0-4]|1?[0-9])?[0-9])\.){3}(25[0-5]|(2[0-4]|1?[0-9])?[0-9])|([0-9a-fA-F]{1,4}:){1,4}:((25[0-5]|(2[0-4]|1?[0-9])?[0-9])\.){3}(25[0-5]|(2[0-4]|1?[0-9])?[0-9]))/,
        'string.is.mime': /^(?=[-a-z]{1,127}\/[-.a-z0-9]{1,127}$)[a-z]+(-[a-z]+)*\/[a-z0-9]+([-.][a-z0-9]+)*$/,
        'string.is.url': /((([A-Za-z]{3,9}:(?:\/\/)?)(?:[\-;:&=+$,\w]+@)?[A-Za-z0-9.\-]+|(?:www\.|[\-;:&=+$,\w]+@)[A-Za-z0-9.\-]+)((?:\/[+~%\/.\w\-_]*)?\??(?:[\-+=&;%@.\w_]*)#?(?:[.!\/\\\w]*))?)/,
        'string.is.uuid': /^[0-9a-fA-F]{8}\b-[0-9a-fA-F]{4}\b-[0-9a-fA-F]{4}\b-[0-9a-fA-F]{4}\b-[0-9a-fA-F]{12}$/,
    }

    function validateRex(key: string, inputValue: any, message: string): ValidationResult {
        if ( regexes[key].test(inputValue) ) {
            return { valid: true }
        }

        return {
            valid: false,
            message
        }
    }

    /** Requires the input value to be alphabetical characters only. */
    export function alpha(fieldName: string, inputValue: any): ValidationResult {
        return validateRex('string.is.alpha', inputValue, 'must be alphabetical only')
    }

    /** Requires the input value to be alphanumeric characters only. */
    export function alphaNum(fieldName: string, inputValue: any): ValidationResult {
        return validateRex('string.is.alpha_num', inputValue, 'must be alphanumeric only')
    }

    /** Requires the input value to be alphabetical characters or the "-" character only. */
    export function alphaDash(fieldName: string, inputValue: any): ValidationResult {
        return validateRex('string.is.alpha_dash', inputValue, 'must be alphabetical and dashes only')
    }

    /** Requires the input value to be alphabetical characters or the "_" character only. */
    export function alphaScore(fieldName: string, inputValue: any): ValidationResult {
        return validateRex('string.is.alpha_score', inputValue, 'must be alphabetical and underscores only')
    }

    /** Requires the input value to be alphabetical characters, numeric characters, "-", or "_" only. */
    export function alphaNumDashScore(fieldName: string, inputValue: any): ValidationResult {
        return validateRex('string.is.alpha_num_dash_score', inputValue, 'must be alphanumeric, dashes, and underscores only')
    }

    /** Requires the input value to be a valid RFC email address format. */
    export function email(fieldName: string, inputValue: any): ValidationResult {
        return validateRex('string.is.email', inputValue, 'must be an email address')
    }

    /** Requires the input value to be a valid IPv4 or IPv6 address. */
    export function ip(fieldName: string, inputValue: any): ValidationResult {
        return validateRex('string.is.ip', inputValue, 'must be a valid IP address')
    }

    /** Requires the input value to be a valid IPv4 address. */
    export function ipv4(fieldName: string, inputValue: any): ValidationResult {
        return validateRex('string.is.ip.v4', inputValue, 'must be a valid IP version 4 address')
    }

    /** Requires the input value to be a valid IPv6 address. */
    export function ipv6(fieldName: string, inputValue: any): ValidationResult {
        return validateRex('string.is.ip.v6', inputValue, 'must be a valid IP version 6 address')
    }

    /** Requires the input value to be a valid file MIME type. */
    export function mime(fieldName: string, inputValue: any): ValidationResult {
        return validateRex('string.is.mime', inputValue, 'must be a valid MIME-type')
    }

    /** Requires the input value to be a valid RFC URL format. */
    export function url(fieldName: string, inputValue: any): ValidationResult {
        return validateRex('string.is.url', inputValue, 'must be a valid URL')
    }

    /** Requires the input value to be a valid RFC UUID format. */
    export function uuid(fieldName: string, inputValue: any): ValidationResult {
        return validateRex('string.is.uuid', inputValue, 'must be a valid UUID')
    }

    /**
     * Builds a validation function that requires the input value to match the given regex.
     * @param rex
     */
    export function regex(rex: RegExp): ValidatorFunction {
        return function regex(fieldName: string, inputValue: any): ValidationResult {
            if ( rex.test(inputValue) ) {
                return { valid: true }
            }

            return {
                valid: false,
                message: 'is not valid'
            }
        }
    }

    /**
     * Builds a validation function that requires the input to NOT match the given regex.
     * @param rex
     */
    export function notRegex(rex: RegExp): ValidatorFunction {
        return function notRegex(fieldName: string, inputValue: any): ValidationResult {
            if ( !rex.test(inputValue) ) {
                return { valid: true }
            }

            return {
                valid: false,
                message: 'is not valid'
            }
        }
    }

    /**
     * Builds a validation function that requires the given input to end with the substring.
     * @param substr
     */
    export function ends(substr: string): ValidatorFunction {
        return function ends(fieldName: string, inputValue: any): ValidationResult {
            if ( String(inputValue).endsWith(substr) ) {
                return { valid: true }
            }

            return {
                valid: false,
                message: `must end with "${substr}"`
            }
        }
    }

    /**
     * Builds a validation function that requires the given input to begin with the substring.
     * @param substr
     */
    export function begins(substr: string): ValidatorFunction {
        return function begins(fieldName: string, inputValue: any): ValidationResult {
            if ( String(inputValue).startsWith(substr) ) {
                return { valid: true }
            }

            return {
                valid: false,
                message: `must begin with "${substr}"`
            }
        }
    }

    /** Requires the input value to be a valid JSON string. */
    export function json(fieldName: string, inputValue: any): ValidationResult {
        if ( isJSON(inputValue) ) {
            return { valid: true }
        }

        return {
            valid: false,
            message: 'must be valid JSON'
        }
    }

    /**
     * Builds a validator function that requires the input value to have exactly len many characters.
     * @param len
     */
    export function length(len: number): ValidatorFunction {
        return function length(fieldName: string, inputValue: any): ValidationResult {
            if ( inputValue.length === len ) {
                return { valid: true }
            }

            return {
                valid: false,
                message: `must be exactly of length ${len}`
            }
        }
    }

    /**
     * Builds a validator function that requires the input value to have at least len many characters.
     * @param len
     */
    export function lengthMin(len: number): ValidatorFunction {
        return function lengthMin(fieldName: string, inputValue: any): ValidationResult {
            if ( inputValue.length >= len ) {
                return { valid: true }
            }

            return {
                valid: false,
                message: `must be at least length ${len}`
            }
        }
    }

    /**
     * Builds a validator function that requires the input value to have at most len many characters.
     * @param len
     */
    export function lengthMax(len: number): ValidatorFunction {
        return function lengthMax(fieldName: string, inputValue: any): ValidationResult {
            if ( inputValue.length <= len ) {
                return { valid: true }
            }

            return {
                valid: false,
                message: `must be at most length ${len}`
            }
        }
    }
}