plane/apps/app/components/gantt-chart/views/month-view.ts

// types
import { ChartDataType } from "../types";
// data
import { weeks, months } from "../data";
// helpers
import {
  generateDate,
  getWeekNumberByDate,
  getNumberOfDaysInMonth,
  getDatesBetweenTwoDates,
} from "./helpers";

type GetAllDaysInMonthInMonthViewType = {
  date: any;
  day: any;
  dayData: any;
  weekNumber: number;
  title: string;
  active: boolean;
  today: boolean;
};
const getAllDaysInMonthInMonthView = (month: number, year: number) => {
  const day: GetAllDaysInMonthInMonthViewType[] = [];
  const numberOfDaysInMonth = getNumberOfDaysInMonth(month, year);
  const currentDate = new Date();

  Array.from(Array(numberOfDaysInMonth).keys()).map((_day: number) => {
    const date: Date = generateDate(_day + 1, month, year);
    day.push({
      date: date,
      day: _day + 1,
      dayData: weeks[date.getDay()],
      weekNumber: getWeekNumberByDate(date),
      title: `${weeks[date.getDay()].shortTitle} ${_day + 1}`,
      active: false,
      today:
        currentDate.getFullYear() === year &&
        currentDate.getMonth() === month &&
        currentDate.getDate() === _day + 1
          ? true
          : false,
    });
  });

  return day;
};

const generateMonthDataByMonthAndYearInMonthView = (month: number, year: number) => {
  const currentMonth: number = month;
  const currentYear: number = year;

  const monthPayload = {
    year: currentYear,
    month: currentMonth,
    monthData: months[currentMonth],
    children: getAllDaysInMonthInMonthView(currentMonth, currentYear),
    title: `${months[currentMonth].title} ${currentYear}`,
  };

  return monthPayload;
};

export const generateMonthChart = (monthPayload: ChartDataType, side: null | "left" | "right") => {
  let renderState = monthPayload;
  const renderPayload: any = [];

  const range: number = renderState.data.approxFilterRange || 6;
  let filteredDates: Date[] = [];
  let minusDate: Date = new Date();
  let plusDate: Date = new Date();

  if (side === null) {
    const currentDate = renderState.data.currentDate;

    minusDate = new Date(
      currentDate.getFullYear(),
      currentDate.getMonth() - range,
      currentDate.getDate()
    );
    plusDate = new Date(
      currentDate.getFullYear(),
      currentDate.getMonth() + range,
      currentDate.getDate()
    );

    if (minusDate && plusDate) filteredDates = getDatesBetweenTwoDates(minusDate, plusDate);

    renderState = {
      ...renderState,
      data: {
        ...renderState.data,
        startDate: filteredDates[0],
        endDate: filteredDates[filteredDates.length - 1],
      },
    };
  } else if (side === "left") {
    const currentDate = renderState.data.startDate;

    minusDate = new Date(
      currentDate.getFullYear(),
      currentDate.getMonth() - range,
      currentDate.getDate()
    );
    plusDate = new Date(
      currentDate.getFullYear(),
      currentDate.getMonth() - 1,
      currentDate.getDate()
    );

    if (minusDate && plusDate) filteredDates = getDatesBetweenTwoDates(minusDate, plusDate);

    renderState = {
      ...renderState,
      data: { ...renderState.data, startDate: filteredDates[0] },
    };
  } else if (side === "right") {
    const currentDate = renderState.data.endDate;

    minusDate = new Date(
      currentDate.getFullYear(),
      currentDate.getMonth() + 1,
      currentDate.getDate()
    );
    plusDate = new Date(
      currentDate.getFullYear(),
      currentDate.getMonth() + range,
      currentDate.getDate()
    );

    if (minusDate && plusDate) filteredDates = getDatesBetweenTwoDates(minusDate, plusDate);

    renderState = {
      ...renderState,
      data: { ...renderState.data, endDate: filteredDates[filteredDates.length - 1] },
    };
  }

  if (filteredDates && filteredDates.length > 0)
    for (const currentDate in filteredDates) {
      const date = filteredDates[parseInt(currentDate)];
      const currentYear = date.getFullYear();
      const currentMonth = date.getMonth();
      renderPayload.push(generateMonthDataByMonthAndYearInMonthView(currentMonth, currentYear));
    }

  const scrollWidth =
    renderPayload
      .map((monthData: any) => monthData.children.length)
      .reduce((partialSum: number, a: number) => partialSum + a, 0) * monthPayload.data.width;

  return { state: renderState, payload: renderPayload, scrollWidth: scrollWidth };
};

export const getNumberOfDaysBetweenTwoDatesInMonth = (startDate: Date, endDate: Date) => {
  let daysDifference: number = 0;
  startDate.setHours(0, 0, 0, 0);
  endDate.setHours(0, 0, 0, 0);

  const timeDifference: number = startDate.getTime() - endDate.getTime();
  daysDifference = Math.abs(Math.floor(timeDifference / (1000 * 60 * 60 * 24)));

  return daysDifference;
};

export const getMonthChartItemPositionWidthInMonth = (chartData: ChartDataType, itemData: any) => {
  let scrollPosition: number = 0;
  let scrollWidth: number = 0;

  const { startDate } = chartData.data;
  const { start_date: itemStartDate, target_date: itemTargetDate } = itemData;

  startDate.setHours(0, 0, 0, 0);
  itemStartDate.setHours(0, 0, 0, 0);
  itemTargetDate.setHours(0, 0, 0, 0);

  // position code starts
  const positionTimeDifference: number = startDate.getTime() - itemStartDate.getTime();
  const positionDaysDifference: number = Math.abs(
    Math.floor(positionTimeDifference / (1000 * 60 * 60 * 24))
  );
  scrollPosition = positionDaysDifference * chartData.data.width;

  var diffMonths = (itemStartDate.getFullYear() - startDate.getFullYear()) * 12;
  diffMonths -= startDate.getMonth();
  diffMonths += itemStartDate.getMonth();

  scrollPosition = scrollPosition + diffMonths;
  // position code ends

  // width code starts
  const widthTimeDifference: number = itemStartDate.getTime() - itemTargetDate.getTime();
  const widthDaysDifference: number = Math.abs(
    Math.floor(widthTimeDifference / (1000 * 60 * 60 * 24))
  );
  scrollWidth = (widthDaysDifference + 1) * chartData.data.width + 1;
  // width code ends

  return { marginLeft: scrollPosition, width: scrollWidth };
};