import { isInRange } from '../lib/dateFilter'

const getDate = (value) => {
  const d = new Date(value)

  let month = d.getUTCMonth() + 1
  const year = d.getUTCFullYear()

  if (month < 10) {
    month = `0${month}`
  }

  return `${month}/${year}`
}

const compute = (transactions, dateFrom, dateTo) => {
  const indexes = {}
  const values = {}
  const labels = []
  const up = {
    label: 'Argent épargné',
    borderColor: 'rgb(105, 167, 86)',
    backgroundColor: 'rgb(121, 199, 83)',
    fill: true,
    data: [],
  }
  const down = {
    label: 'Argent non épargné',
    borderColor: 'rgb(217, 139, 102)',
    backgroundColor: 'rgb(255, 209, 130)',
    fill: true,
    data: [],
  }

  transactions.forEach((transaction) => {
    if (!isInRange(transaction.date, dateFrom, dateTo)) {
      return
    }

    const date = getDate(transaction.date)

    if (!Object.hasOwn(indexes, date)) {
      indexes[date] = labels.length
      values[date] = 0
      labels.push(date)
    }

    values[date] += transaction.credit - transaction.debit
  })

  labels.forEach((label) => {
    const value = values[label]

    if (value >= 0) {
      up.data.push(value)
      down.data.push(0)
    } else {
      down.data.push(value)
      up.data.push(0)
    }
  })

  const config = {
    labels: labels,
    datasets: [up, down],
  }

  return config
}

export { compute }