import { ValidationOptions } from "../ValidationOptions";
import { registerDecorator } from "../../register-decorator";
import { ValidationArguments } from "../../validation/ValidationArguments";
import { ValidatorConstraintInterface } from "../../validation/ValidatorConstraintInterface";

export interface ValidateByOptions {
    name: string;
    constraints?: any[];
    validator: ValidatorConstraintInterface | Function;
    async?: boolean;
}

export function buildMessage(
    impl: (eachPrefix: string, args?: ValidationArguments) => string,
    validationOptions?: ValidationOptions): (validationArguments?: ValidationArguments) => string {
    return (validationArguments?: ValidationArguments): string => {
        const eachPrefix = validationOptions && validationOptions.each
            ? "each value in "
            : "";
        return impl(eachPrefix, validationArguments);
    };
}

export function ValidateBy(options: ValidateByOptions, validationOptions?: ValidationOptions): PropertyDecorator {
    return function (object: object, propertyName: string): void {
        registerDecorator({
            name: options.name,
            target: object.constructor,
            propertyName: propertyName,
            options: validationOptions,
            constraints: options.constraints,
            validator: options.validator
        });
    };
}