#!/usr/bin/env node
import assert from 'assert'
import { isArray, isString } from 'lodash-es'

function countArrayValues(arr) {
  const counter = new Map()
  arr.forEach((value) => counter.set(value, (counter.get(value) || 0) + 1))
  return [...counter.entries()].map(([value, count]) => {
    return { value, count }
  })
}

export default function validateRecords(name, records) {
  assert(isString(name) && name.length, '`name` is required')
  assert(isArray(records) && records.length, '`records` must be a non-empty array')

  // each ID is unique
  const objectIDs = records.map((record) => record.objectID)
  const dupes = countArrayValues(objectIDs)
    .filter(({ count }) => count > 1)
    .map(({ value }) => value)
  assert(!dupes.length, `every objectID must be unique. dupes: ${dupes.join('; ')}`)

  records.forEach((record) => {
    assert(
      isString(record.objectID) && record.objectID.length,
      `objectID must be a string. received: ${record.objectID}, ${JSON.stringify(record)}`
    )

    assert(
      isString(record.title) && record.title.length,
      `title must be a string. received: ${record.title}, ${JSON.stringify(record)}`
    )
  })

  return true
}