import { node } from "../../nodes/composite/type.js"
import { serializeRegex } from "../../nodes/primitive/regex.js"

// https://github.com/validatorjs/validator.js/blob/master/src/lib/isLuhnNumber.js
export const isLuhnValid = (creditCardInput: string) => {
    const sanitized = creditCardInput.replace(/[- ]+/g, "")
    let sum = 0
    let digit
    let tmpNum
    let shouldDouble
    for (let i = sanitized.length - 1; i >= 0; i--) {
        digit = sanitized.substring(i, i + 1)
        tmpNum = parseInt(digit, 10)
        if (shouldDouble) {
            tmpNum *= 2
            if (tmpNum >= 10) {
                sum += (tmpNum % 10) + 1
            } else {
                sum += tmpNum
            }
        } else {
            sum += tmpNum
        }
        shouldDouble = !shouldDouble
    }
    return !!(sum % 10 === 0 ? sanitized : false)
}

// https://github.com/validatorjs/validator.js/blob/master/src/lib/isCreditCard.js
const creditCardMatcher =
    /^(?:4[0-9]{12}(?:[0-9]{3,6})?|5[1-5][0-9]{14}|(222[1-9]|22[3-9][0-9]|2[3-6][0-9]{2}|27[01][0-9]|2720)[0-9]{12}|6(?:011|5[0-9][0-9])[0-9]{12,15}|3[47][0-9]{13}|3(?:0[0-5]|[68][0-9])[0-9]{11}|(?:2131|1800|35\d{3})\d{11}|6[27][0-9]{14}|^(81[0-9]{14,17}))$/

// TODO:   { mustBe: "a valid credit card number" }
export const creditCard = node({
    basis: "string",
    regex: serializeRegex(creditCardMatcher),
    narrow: (s, state) =>
        isLuhnValid(s) ||
        // TODO: Fix
        !state.mustBe("a valid credit card number", s, state.basePath)
})