Function buildYearlyEvolution

app/utils/chart-data-buckets.ts:106–140

(
  daily: DailyRawPoint[],
  rangeStartIso?: string,
  rangeEndIso?: string,
)

}

export function buildYearlyEvolution(
  daily: DailyRawPoint[],
  rangeStartIso?: string,
  rangeEndIso?: string,
): YearlyDataPoint[] {
  const sorted = sortedDaily(daily)
  const byYear = new Map<string, number>()
  for (const item of sorted) {
    const y = item.day.slice(0, 4)
    byYear.set(y, (byYear.get(y) ?? 0) + item.value)
  }

  const entries = Array.from(byYear.entries()).sort(([a], [b]) => a.localeCompare(b))

  return entries.map(([year, value], i) => {
    const total = daysInYear(Number(year))
    const yearStart = parseIsoDate(`${year}-01-01`)
    const isFirst = i === 0
    const isLast = i === entries.length - 1

    const startOffset =
      isFirst && rangeStartIso
        ? Math.floor((parseIsoDate(rangeStartIso).getTime() - yearStart.getTime()) / DAY_MS)
        : 0
    const endOffset =
      isLast && rangeEndIso
        ? Math.floor((parseIsoDate(rangeEndIso).getTime() - yearStart.getTime()) / DAY_MS) + 1
        : total
    const actualDays = endOffset - startOffset

    if (actualDays < total) value = fillPartialBucket(value, actualDays, total)

    return { year, value, timestamp: yearStart.getTime() }
  })
}