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getISODay,
getISOWeek,
getISOWeeksInYear,
getYear,
parseISO,
} from "date-fns";
import type {
CalendarWeekData,
CalendarYearData,
CalendarYearsData,
ValuesPerDay,
} from "~/types";
/** Creates a UTC date. */
export const createUtcDate = (year: number, month: number, day: number) =>
new Date(Date.UTC(year, month - 1, day, 0, 0, 0, 0));
/**
* Extracts the minimum and maximum years from the given `ValuesPerDay`
* object.
*
* @param valuesPerDay - The `ValuesPerDay` object to extract the year
* range from.
* @returns An object containing the `minimumYear` and `maximumYear`.
*/
export const extractYearRange = (
valuesPerDay: ValuesPerDay
): { minimumYear: number; maximumYear: number } => {
let minimumYear = Infinity;
let maximumYear = -Infinity;
for (const dateString of valuesPerDay.keys()) {
const year = getYear(parseISO(dateString));
minimumYear = Math.min(minimumYear, year);
maximumYear = Math.max(maximumYear, year);
}
return { minimumYear, maximumYear };
};
/**
* Given a date, get its adjusted ISO week number based on the project
* requirements:
*
* - If a date's month is January and its week number is greater than 50, it
* will be changed to week 0.
* - If a date's month is December and its week number is less than 10, it
* will be changed to the number of ISO 8601 weeks in that year + 1.
*
* @param {Date} date - The date to get the adjusted ISO week number for.
* @returns {number} - The adjusted ISO week number.
*/
export const getAdjustedISOWeek = (date: Date): number => {
const month = date.getMonth();
const isoWeek = getISOWeek(date);
const isoWeeksInYear = getISOWeeksInYear(date);
if (month === 0 && isoWeek > 50) {
return 0;
} else if (month === 11 && isoWeek < 10) {
return isoWeeksInYear + 1;
}
return isoWeek;
};
/**
* Initializes an empty `CalendarYearData`.
*
* If there are no values for that specific day, it will be `0`. If that day is
* not part of the calendar year, it will be `-1`.
*
* @param {number} year - The year to initialize the data for.
* @returns {CalendarYearData} a `CalendarYearData` with default values.
*/
export const initializeEmptyCalendarYearData = (
year: number
): CalendarYearData => {
const firstDateOfYear = createUtcDate(year, 1, 1);
const lastDateOfYear = createUtcDate(year, 12, 31);
const firstWeekOfYearAdjusted = getAdjustedISOWeek(firstDateOfYear);
const lastWeekOfYearAdjusted = getAdjustedISOWeek(lastDateOfYear);
const firstDayOfYear = getISODay(firstDateOfYear) - 1;
const lastDayOfYear = getISODay(lastDateOfYear) - 1;
const yearData: CalendarYearData = [
...(Array.from(
{ length: 54 },
(_, weekIndex) =>
Array.from({ length: 7 }, (_, dayIndex) => {
if (
(weekIndex === firstWeekOfYearAdjusted &&
dayIndex < firstDayOfYear) ||
(weekIndex === lastWeekOfYearAdjusted && dayIndex > lastDayOfYear)
) {
return -1;
} else if (
weekIndex < firstWeekOfYearAdjusted ||
weekIndex > lastWeekOfYearAdjusted
) {
return -1;
} else {
return 0;
}
}) as CalendarWeekData
) as CalendarYearData),
];
return yearData;
};
/**
* Converts a `ValuesPerDay` object to a `CalendarYearsData` object.
*
* @param valuesPerDay - The `ValuesPerDay` object to convert.
* @returns The converted `CalendarYearsData` object.
*/
export const convertToCalendarYearData = (
valuesPerDay: ValuesPerDay
): CalendarYearsData => {
const { minimumYear, maximumYear } = extractYearRange(valuesPerDay);
const yearsData: CalendarYearsData = [];
for (let year = minimumYear; year <= maximumYear; year++) {
yearsData.push(initializeEmptyCalendarYearData(year));
}
for (const [dateString, value] of valuesPerDay) {
const date = parseISO(dateString);
const year = getYear(date);
const yearIndex = year - minimumYear;
const weekIndex = getAdjustedISOWeek(date);
const dayIndex = getISODay(date) - 1;
const yearData = yearsData[yearIndex];
if (!yearData) continue;
const weekData = yearData[weekIndex];
if (!weekData || weekData[dayIndex] === -1) continue;
weekData[dayIndex] = (weekData[dayIndex] ?? 0) + value;
}
return yearsData;
};
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