import lodashMemoize from 'lodash/memoize.js';

/* @link http://stackoverflow.com/questions/46155/validate-email-address-in-javascript */
const EMAIL_REGEX =
    /^(([^<>()\[\]\\.,;:\s@"]+(\.[^<>()\[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/; // eslint-disable-line no-useless-escape

export const isEmpty = (value: any) =>
    typeof value === 'undefined' ||
    value === null ||
    value === '' ||
    (Array.isArray(value) && value.length === 0);

export interface ValidationErrorMessageWithArgs {
    message: string;
    args: {
        [key: string]: ValidationErrorMessageWithArgs | any;
    };
}

export type ValidationErrorMessage = string | ValidationErrorMessageWithArgs;

export type Validator = (
    value: any,
    values: any,
    props: any
) =>
    | ValidationErrorMessage
    | null
    | undefined
    | Promise<ValidationErrorMessage | null | undefined>;

// type predicate, see https://www.typescriptlang.org/docs/handbook/2/narrowing.html#using-type-predicates
function isValidationErrorMessageWithArgs(
    error: ReturnType<Validator>
): error is ValidationErrorMessageWithArgs {
    return error ? error.hasOwnProperty('message') : false;
}

export interface GetValidationMessageParams {
    args: any;
    value: any;
    values: any;
}

export type GetValidationMessage = (
    params: GetValidationMessageParams
) => ValidationErrorMessage;

const getMessage = (
    message: string | GetValidationMessage,
    messageArgs: any,
    value: any,
    values: any
) =>
    typeof message === 'function'
        ? message({
              args: messageArgs,
              value,
              values,
          })
        : messageArgs
          ? {
                message,
                args: messageArgs,
            }
          : message;

type Memoize = <T extends (...args: any[]) => any>(
    func: T,
    resolver?: (...args: any[]) => any
) => T;

// If we define validation functions directly in JSX, it will
// result in a new function at every render, and then trigger infinite re-render.
// Hence, we memoize every built-in validator to prevent a "Maximum call stack" error.
const memoize: Memoize = (fn: any) =>
    lodashMemoize(fn, (...args) => JSON.stringify(args));

const isFunction = value => typeof value === 'function';

export const combine2Validators = (
    validator1: Validator,
    validator2: Validator
): Validator => {
    return (value, values, meta) => {
        const result1 = validator1(value, values, meta);
        if (!result1) {
            return validator2(value, values, meta);
        }
        if (
            typeof result1 === 'string' ||
            isValidationErrorMessageWithArgs(result1)
        ) {
            return result1;
        }

        return result1.then(resolvedResult1 => {
            if (!resolvedResult1) {
                return validator2(value, values, meta);
            }
            return resolvedResult1;
        });
    };
};

// Compose multiple validators into a single one for use with react-hook-form
export const composeValidators = (...validators) => {
    const allValidators = (
        Array.isArray(validators[0]) ? validators[0] : validators
    ).filter(isFunction) as Validator[];
    return allValidators.reduce(combine2Validators, () => null);
};

// Compose multiple validators into a single one for use with react-hook-form
export const composeSyncValidators =
    (...validators) =>
    (value, values, meta) => {
        const allValidators = (
            Array.isArray(validators[0]) ? validators[0] : validators
        ).filter(isFunction) as Validator[];

        for (const validator of allValidators) {
            const error = validator(value, values, meta);

            if (error) {
                return error;
            }
        }
    };

/**
 * Required validator
 *
 * Returns an error if the value is null, undefined, or empty
 *
 * @param {string|Function} message
 *
 * @example
 *
 * const titleValidators = [required('The title is required')];
 * <TextInput name="title" validate={titleValidators} />
 */
export const required = memoize((message = 'ra.validation.required') =>
    Object.assign(
        (value, values) =>
            isEmpty(value)
                ? getMessage(message, undefined, value, values)
                : undefined,
        { isRequired: true }
    )
);

/**
 * Minimum length validator
 *
 * Returns an error if the value has a length less than the parameter
 *
 * @param {integer} min
 * @param {string|Function} message
 *
 * @example
 *
 * const passwordValidators = [minLength(10, 'Should be at least 10 characters')];
 * <TextInput type="password" name="password" validate={passwordValidators} />
 */
export const minLength = memoize(
    (min, message = 'ra.validation.minLength') =>
        (value, values) =>
            !isEmpty(value) && value.length < min
                ? getMessage(message, { min }, value, values)
                : undefined
);

/**
 * Maximum length validator
 *
 * Returns an error if the value has a length higher than the parameter
 *
 * @param {integer} max
 * @param {string|Function} message
 *
 * @example
 *
 * const nameValidators = [maxLength(10, 'Should be at most 10 characters')];
 * <TextInput name="name" validate={nameValidators} />
 */
export const maxLength = memoize(
    (max, message = 'ra.validation.maxLength') =>
        (value, values) =>
            !isEmpty(value) && value.length > max
                ? getMessage(message, { max }, value, values)
                : undefined
);

/**
 * Minimum validator
 *
 * Returns an error if the value is less than the parameter
 *
 * @param {integer} min
 * @param {string|Function} message
 *
 * @example
 *
 * const fooValidators = [minValue(5, 'Should be more than 5')];
 * <NumberInput name="foo" validate={fooValidators} />
 */
export const minValue = memoize(
    (min, message = 'ra.validation.minValue') =>
        (value, values) =>
            !isEmpty(value) && value < min
                ? getMessage(message, { min }, value, values)
                : undefined
);

/**
 * Maximum validator
 *
 * Returns an error if the value is higher than the parameter
 *
 * @param {integer} max
 * @param {string|Function} message
 *
 * @example
 *
 * const fooValidators = [maxValue(10, 'Should be less than 10')];
 * <NumberInput name="foo" validate={fooValidators} />
 */
export const maxValue = memoize(
    (max, message = 'ra.validation.maxValue') =>
        (value, values) =>
            !isEmpty(value) && value > max
                ? getMessage(message, { max }, value, values)
                : undefined
);

/**
 * Number validator
 *
 * Returns an error if the value is not a number
 *
 * @param {string|Function} message
 *
 * @example
 *
 * const ageValidators = [number('Must be a number')];
 * <TextInput name="age" validate={ageValidators} />
 */
export const number = memoize(
    (message = 'ra.validation.number') =>
        (value, values) =>
            !isEmpty(value) && isNaN(Number(value))
                ? getMessage(message, undefined, value, values)
                : undefined
);

/**
 * Regular expression validator
 *
 * Returns an error if the value does not match the pattern given as parameter
 *
 * @param {RegExp} pattern
 * @param {string|Function} message
 *
 * @example
 *
 * const zipValidators = [regex(/^\d{5}(?:[-\s]\d{4})?$/, 'Must be a zip code')];
 * <TextInput name="zip" validate={zipValidators} />
 */
export const regex = lodashMemoize(
    (pattern, message = 'ra.validation.regex') =>
        (value, values?) =>
            !isEmpty(value) && typeof value === 'string' && !pattern.test(value)
                ? getMessage(message, { pattern }, value, values)
                : undefined,
    (pattern, message) => {
        return pattern.toString() + message;
    }
);

/**
 * Email validator
 *
 * Returns an error if the value is not a valid email
 *
 * @param {string|Function} message
 *
 * @example
 *
 * const emailValidators = [email('Must be an email')];
 * <TextInput name="email" validate={emailValidators} />
 */
export const email = memoize((message = 'ra.validation.email') =>
    regex(EMAIL_REGEX, message)
);

const oneOfTypeMessage: GetValidationMessage = ({ args }) => ({
    message: 'ra.validation.oneOf',
    args,
});

/**
 * Choices validator
 *
 * Returns an error if the value is not among the list passed as parameter
 *
 * @param {array} list
 * @param {string|Function} message
 *
 * @example
 *
 * const genderValidators = [choices(['male', 'female'], 'Must be either Male or Female')];
 * <TextInput name="gender" validate={genderValidators} />
 */
export const choices = memoize(
    (list, message = oneOfTypeMessage) =>
        (value, values) =>
            !isEmpty(value) && list.indexOf(value) === -1
                ? getMessage(message, { list }, value, values)
                : undefined
);

/**
 * Given a validator, returns a boolean indicating whether the field is required or not.
 */
export const isRequired = validate => {
    if (validate && validate.isRequired) {
        return true;
    }
    if (Array.isArray(validate)) {
        return !!validate.find(it => it.isRequired);
    }
    return false;
};