import $ from 'jquery';
import { Datepicker } from 'vanillajs-datepicker';
import { toggleModal } from './modals.js';
import * as localStorage from './local-storage.js';

// Placeholder start date used in InfluxDB custom timestamps
const defaultStartDate = '2022-01-01';

// Return yyyy-mm-dd formatted string from a Date object
function formatDate(dateObj) {
  return dateObj.toISOString().replace(/T.*$/, '');
}

// Return yesterday's date
function yesterday() {
  const yesterday = new Date();
  yesterday.setDate(yesterday.getDate() - 1);

  return formatDate(yesterday);
}

// Split a date string into year, month, and day
function datePart(date) {
  const datePartRegex = /(\d{4})-(\d{2})-(\d{2})/;
  const year = date.replace(datePartRegex, '$1');
  const month = date.replace(datePartRegex, '$2');
  const day = date.replace(datePartRegex, '$3');

  return { year: year, month: month, day: day };
}

///////////////////////// PREFERENCE COOKIE MANAGEMENT /////////////////////////

const prefID = 'sample_get_started_date';

function setStartDate(setDate) {
  localStorage.setPreference(prefID, setDate);
}

function getStartDate() {
  return localStorage.getPreference(prefID);
}

////////////////////////////////////////////////////////////////////////////////

// If the user has not set the startDate cookie, default the startDate to yesterday
var startDate = getStartDate() || yesterday();

// Convert a time value to a Unix timestamp (seconds)
function timeToUnixSeconds(time) {
  const unixSeconds = new Date(time).getTime() / 1000;

  return unixSeconds;
}

  // Default time values in getting started sample data
  const defaultTimes = [
    {
      rfc3339: `${defaultStartDate}T08:00:00Z`,
      unix: timeToUnixSeconds(`${defaultStartDate}T08:00:00Z`),
    }, // 1641024000
    {
      rfc3339: `${defaultStartDate}T09:00:00Z`,
      unix: timeToUnixSeconds(`${defaultStartDate}T09:00:00Z`),
    }, // 1641027600
    {
      rfc3339: `${defaultStartDate}T10:00:00Z`,
      unix: timeToUnixSeconds(`${defaultStartDate}T10:00:00Z`),
    }, // 1641031200
    {
      rfc3339: `${defaultStartDate}T11:00:00Z`,
      unix: timeToUnixSeconds(`${defaultStartDate}T11:00:00Z`),
    }, // 1641034800
    {
      rfc3339: `${defaultStartDate}T12:00:00Z`,
      unix: timeToUnixSeconds(`${defaultStartDate}T12:00:00Z`),
    }, // 1641038400
    {
      rfc3339: `${defaultStartDate}T13:00:00Z`,
      unix: timeToUnixSeconds(`${defaultStartDate}T13:00:00Z`),
    }, // 1641042000
    {
      rfc3339: `${defaultStartDate}T14:00:00Z`,
      unix: timeToUnixSeconds(`${defaultStartDate}T14:00:00Z`),
    }, // 1641045600
    {
      rfc3339: `${defaultStartDate}T15:00:00Z`,
      unix: timeToUnixSeconds(`${defaultStartDate}T15:00:00Z`),
    }, // 1641049200
    {
      rfc3339: `${defaultStartDate}T16:00:00Z`,
      unix: timeToUnixSeconds(`${defaultStartDate}T16:00:00Z`),
    }, // 1641052800
    {
      rfc3339: `${defaultStartDate}T17:00:00Z`,
      unix: timeToUnixSeconds(`${defaultStartDate}T17:00:00Z`),
    }, // 1641056400
    {
      rfc3339: `${defaultStartDate}T18:00:00Z`,
      unix: timeToUnixSeconds(`${defaultStartDate}T18:00:00Z`),
    }, // 1641060000
    {
      rfc3339: `${defaultStartDate}T19:00:00Z`,
      unix: timeToUnixSeconds(`${defaultStartDate}T19:00:00Z`),
    }, // 1641063600
    {
      rfc3339: `${defaultStartDate}T20:00:00Z`,
      unix: timeToUnixSeconds(`${defaultStartDate}T20:00:00Z`),
    }, // 1641067200
  ];

function updateTimestamps (newStartDate, seedTimes=defaultTimes) {
  // Update the times array with replacement times
  const times = seedTimes.map(x => {
    var newStartTimestamp = x.rfc3339.replace(/^.*T/, newStartDate + 'T');

    return {
      rfc3339: x.rfc3339,
      unix: x.unix,
      rfc3339_new: newStartTimestamp,
      unix_new: timeToUnixSeconds(newStartTimestamp),
    };
  });

  var updateBlockElWhitelist = [
    '.custom-timestamps pre',
    '.custom-timestamps li',
    '.custom-timestamps p',
    '.custom-timestamps table',
  ];

  $(updateBlockElWhitelist.join()).each(function () {
    var wrapper = $(this)[0];

    times.forEach(function (x) {
      const oldDatePart = datePart(x.rfc3339.replace(/T.*$/, ''));
      const newDatePart = datePart(x.rfc3339_new.replace(/T.*$/, ''));
      const rfc3339Regex = new RegExp(
        `${oldDatePart.year}(.*?)${oldDatePart.month}(.*?)${oldDatePart.day}`,
        'g'
      );
      const rfc3339Repl = `${newDatePart.year}$1${newDatePart.month}$2${newDatePart.day}`;

      wrapper.innerHTML = wrapper.innerHTML
        .replaceAll(x.unix, x.unix_new)
        .replaceAll(rfc3339Regex, rfc3339Repl);
    });
  });

  $('span.custom-timestamps').each(function () {
    var wrapper = $(this)[0];

    times.forEach(function (x) {
      const oldDatePart = datePart(x.rfc3339.replace(/T.*$/, ''));
      const newDatePart = datePart(x.rfc3339_new.replace(/T.*$/, ''));
      const rfc3339Regex = new RegExp(
        `${oldDatePart.year}-${oldDatePart.month}-${oldDatePart.day}`,
        'g'
      );
      const rfc3339Repl = `${newDatePart.year}-${newDatePart.month}-${newDatePart.day}`;

      wrapper.innerHTML = wrapper.innerHTML
        .replaceAll(x.unix, x.unix_new)
        .replaceAll(rfc3339Regex, rfc3339Repl);
    });
  });

  // Create a new seed times array with new start time for next change
  return times.map((x) => {
    var newStartTimestamp = x.rfc3339.replace(/^.*T/, newStartDate + 'T');

    return {
      rfc3339: newStartTimestamp,
      unix: timeToUnixSeconds(newStartTimestamp),
    };
  });
}

/////////////////////// MODAL INTERACTIONS / DATE PICKER ///////////////////////

function CustomTimeTrigger({component}) {
  const $component = $(component);
  $component
    .find('a[data-action="open"]:first')
    .on('click', () => toggleModal('#influxdb-gs-date-select'));

  // Date picker form element
  var datePickerEl = $('#custom-date-selector');

  // Initialize the date picker with the current startDate
  const elem = datePickerEl[0];
  const datepicker = new Datepicker(elem, {
    defaultViewDate: startDate,
    format: 'yyyy-mm-dd',
    nextArrow: '>',
    prevArrow: '<',
  });

  //////////////////////////////////// ACTIONS ///////////////////////////////////

  // Initial update to yesterdays date ON PAGE LOAD
  // Conditionally set the start date cookie it startDate is equal to the default value
  let updatedTimes = updateTimestamps(startDate, defaultTimes);

  if (startDate === yesterday()) {
    setStartDate(startDate);
  }

  // Submit new date
  $('#submit-custom-date').click(function () {
    let newDate = datepicker.getDate();

    if (newDate != undefined) {
      newDate = formatDate(newDate);
      
      // Update the last updated timestamps with the new date
      // and reassign the updated times.
      updatedTimes = updateTimestamps(newDate, updatedTimes);
      setStartDate(newDate);
      toggleModal('#influxdb-gs-date-select');
    } else {
      toggleModal('#influxdb-gs-date-select');
    }
  });
}

export { CustomTimeTrigger };