import isEqual from 'lodash.isequal'

import cryptoUtils from '../crypto/utils.js'
import {Address} from '../types.js'
import {getAddress} from '../helpers.js'

function hexToBytes(hex: string) {
    const bytes = []
    for (let c = 0; c < hex.length; c += 2) {
        bytes.push(parseInt(hex.substr(c, 2), 16))
    }
    return bytes
}

function verifyChecksum(address: string) {
    const checksumBytes = address.slice(0, 32 * 2)
    const check = address.slice(32 * 2, 38 * 2)
    const blakeHash = cryptoUtils.blake2b(checksumBytes, 32).slice(0, 6 * 2)
    return !!isEqual(blakeHash, check)
}

export default {
    isValidAddress: function (address: Address) {
        const addr = getAddress(address)
        if (addr.length !== 76) {
            // Check if it has the basic requirements of an address
            return false
        }

        // Otherwise check each case
        return verifyChecksum(addr)
    },
}