import {
  addDays,
  addMonths,
  addYears, format, startOfMonth,
  startOfWeek,
  startOfYear
} from 'date-fns'


const xAxisFormats = [
  { duration: 'week', dateFormat: 'YYYY-MM-DD', xAxis: 'DD/MM' },
  { duration: 'month', dateFormat: 'YYYY-MM', xAxis: 'MM/YYYY' },
  { duration: 'year', dateFormat: 'YYYY', xAxis: 'YYYY' },
]

export const formatDuration = (totalSeconds, formatWithDay = false) => {
  let days = '0'
  if (formatWithDay) {
    days = String(Math.floor(totalSeconds / 86400))
    totalSeconds %= 86400
  }
  const hours = String(Math.floor(totalSeconds / 3600)).padStart(2, '0')
  totalSeconds %= 3600
  const minutes = String(Math.floor(totalSeconds / 60)).padStart(2, '0')
  const seconds = String(totalSeconds % 60).padStart(2, '0')
  if (formatWithDay) {
    return `${
      days === '0' ? '' : `${days}d:`
    }${
      hours === '00' ? '' : `${hours}h:`
    }${minutes}m:${seconds}s`
  }
  return `${hours === '00' ? '' : `${hours}:`}${minutes}:${seconds}`
}

export const formatValue = (displayedData, value) => value === 0
    ? ''
    : displayedData === 'distance'
      ? `${value.toFixed(2)} km`
      : displayedData === 'duration'
        ? formatDuration(value)
        : value

const dateIncrement = (duration, day) => {
  switch (duration) {
    case 'week':
      return addDays(day, 7)
    case 'year':
      return addYears(day, 1)
    case 'month':
    default:
      return addMonths(day, 1)
  }
}

const startDate = (duration, day) => {
  switch (duration) {
    case 'week':
      return startOfWeek(day)
    case 'year':
      return startOfYear(day)
    case 'month':
    default:
      return startOfMonth(day)
  }
}

export const formatStats = (
  stats, sports, params, displayedSports
) => {
  const nbActivitiesStats = []
  const distanceStats = []
  const durationStats = []

  for (let day = startDate(params.duration, params.start);
       day <= params.end;
       day = dateIncrement(params.duration, day)
  ) {
    const [xAxisFormat] = xAxisFormats.filter(
      x => x.duration === params.duration
    )
    const date = format(day, xAxisFormat.dateFormat)
    const xAxis = format(day, xAxisFormat.xAxis)
    const dataNbActivities = { date: xAxis }
    const dataDistance = { date: xAxis }
    const dataDuration = { date: xAxis }

    if (stats[date]) {
      Object.keys(stats[date]).filter(
        sportId => displayedSports ? displayedSports.includes(+sportId) : true
      ).map(sportId => {
        const sportLabel = sports.filter(s => s.id === +sportId)[0].label
        dataNbActivities[sportLabel] = stats[date][sportId].nb_activities
        dataDistance[sportLabel] = stats[date][sportId].total_distance
        dataDuration[sportLabel] = stats[date][sportId].total_duration
        return null
      })
    }
    nbActivitiesStats.push(dataNbActivities)
    distanceStats.push(dataDistance)
    durationStats.push(dataDuration)
  }

  return {
    activities: nbActivitiesStats,
    distance: distanceStats,
    duration: durationStats
  }
}