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import DateProfileGenerator from '../DateProfileGenerator'
import { DateMarker, addDays, diffDays } from '../datelib/marker'
import { DateRange } from '../datelib/date-range'
export interface DaySeriesSeg {
firstIndex: number
lastIndex: number
isStart: boolean
isEnd: boolean
}
export default class DaySeries {
cnt: number
dates: DateMarker[] // whole-day dates for each column. left to right
indices: number[] // for each day from start, the offset
constructor(range: DateRange, dateProfileGenerator: DateProfileGenerator) {
let date: DateMarker = range.start
let end: DateMarker = range.end
let indices: number[] = []
let dates: DateMarker[] = []
let dayIndex = -1
while (date < end) { // loop each day from start to end
if (dateProfileGenerator.isHiddenDay(date)) {
indices.push(dayIndex + 0.5) // mark that it's between indices
} else {
dayIndex++
indices.push(dayIndex)
dates.push(date)
}
date = addDays(date, 1)
}
this.dates = dates
this.indices = indices
this.cnt = dates.length
}
sliceRange(range: DateRange): DaySeriesSeg | null {
let firstIndex = this.getDateDayIndex(range.start) // inclusive first index
let lastIndex = this.getDateDayIndex(addDays(range.end, -1)) // inclusive last index
let clippedFirstIndex = Math.max(0, firstIndex)
let clippedLastIndex = Math.min(this.cnt - 1, lastIndex)
// deal with in-between indices
clippedFirstIndex = Math.ceil(clippedFirstIndex) // in-between starts round to next cell
clippedLastIndex = Math.floor(clippedLastIndex) // in-between ends round to prev cell
if (clippedFirstIndex <= clippedLastIndex) {
return {
firstIndex: clippedFirstIndex,
lastIndex: clippedLastIndex,
isStart: firstIndex === clippedFirstIndex,
isEnd: lastIndex === clippedLastIndex
}
} else {
return null
}
}
// Given a date, returns its chronolocial cell-index from the first cell of the grid.
// If the date lies between cells (because of hiddenDays), returns a floating-point value between offsets.
// If before the first offset, returns a negative number.
// If after the last offset, returns an offset past the last cell offset.
// Only works for *start* dates of cells. Will not work for exclusive end dates for cells.
private getDateDayIndex(date: DateMarker) {
let indices = this.indices
let dayOffset = Math.floor(diffDays(this.dates[0], date))
if (dayOffset < 0) {
return indices[0] - 1
} else if (dayOffset >= indices.length) {
return indices[indices.length - 1] + 1
} else {
return indices[dayOffset]
}
}
}