From 6975055fd388c813e730a9be65f6fc96ad5f213e Mon Sep 17 00:00:00 2001
From: Anton Tananaev <anton@traccar.org>
Date: Sat, 6 Aug 2022 07:24:13 -0700
Subject: Support direct calendar creation

---
 modern/src/settings/CalendarPage.js | 132 +++++++++++++++++++++++++++++++++---
 web/l10n/en.json                    |  14 ++++
 2 files changed, 137 insertions(+), 9 deletions(-)

diff --git a/modern/src/settings/CalendarPage.js b/modern/src/settings/CalendarPage.js
index 27fdb462..862aa9a3 100644
--- a/modern/src/settings/CalendarPage.js
+++ b/modern/src/settings/CalendarPage.js
@@ -1,7 +1,8 @@
+import moment from 'moment';
 import React, { useState } from 'react';
 import TextField from '@mui/material/TextField';
 import {
-  Accordion, AccordionSummary, AccordionDetails, Typography,
+  Accordion, AccordionSummary, AccordionDetails, Typography, FormControl, InputLabel, Select, MenuItem,
 } from '@mui/material';
 import makeStyles from '@mui/styles/makeStyles';
 import ExpandMoreIcon from '@mui/icons-material/ExpandMore';
@@ -10,6 +11,49 @@ import EditItemView from './components/EditItemView';
 import EditAttributesAccordion from './components/EditAttributesAccordion';
 import { useTranslation } from '../common/components/LocalizationProvider';
 import SettingsMenu from './components/SettingsMenu';
+import { prefixString } from '../common/util/stringUtils';
+
+const formatTime = (time) => {
+  const tzid = Intl.DateTimeFormat().resolvedOptions().timeZone;
+  return `TZID=${tzid}:${time.format('YYYYMMDDTHHmmss')}`;
+};
+
+const parseRule = (rule) => {
+  const fragments = rule.split(';');
+  const frequency = fragments[0].includes('FREQ') ? fragments[0].substring(11) : 'ONCE';
+  const by = fragments.length > 1 ? fragments[1].split('=')[1].split(',') : null;
+  return { frequency, by };
+};
+
+const formatRule = (rule) => {
+  const by = rule.by && rule.by.join(',');
+  switch (rule.frequency) {
+    case 'DAILY':
+      return `RRULE:FREQ=${rule.frequency}`;
+    case 'WEEKLY':
+      return `RRULE:FREQ=${rule.frequency};BYDAY=${by || 'SU'}`;
+    case 'MONTHLY':
+      return `RRULE:FREQ=${rule.frequency};BYMONTHDAY=${by || 1}`;
+    default:
+      return 'RRULE:';
+  }
+};
+
+const updateCalendar = (lines, index, element) => window.btoa(lines.map((e, i) => (i !== index ? e : element)).join('\n'));
+
+const simpleCalendar = () => window.btoa([
+  'BEGIN:VCALENDAR',
+  'VERSION:2.0',
+  'PRODID:-//Traccar//NONSGML Traccar//EN',
+  'BEGIN:VEVENT',
+  'UID:00000000-0000-0000-0000-000000000000',
+  `DTSTART;${formatTime(moment())}`,
+  `DTEND;${formatTime(moment().add(1, 'hours'))}`,
+  'RRULE:FREQ=DAILY',
+  'SUMMARY:Event',
+  'END:VEVENT',
+  'END:VCALENDAR',
+].join('\n'));
 
 const useStyles = makeStyles((theme) => ({
   details: {
@@ -26,6 +70,14 @@ const CalendarPage = () => {
 
   const [item, setItem] = useState();
 
+  const decoded = item && item.data && window.atob(item.data);
+
+  const simple = decoded && decoded.indexOf('//Traccar//') > 0;
+
+  const lines = decoded && decoded.split('\n');
+
+  const rule = simple && parseRule(lines[7]);
+
   const handleFiles = (files) => {
     if (files.length > 0) {
       const reader = new FileReader();
@@ -34,8 +86,6 @@ const CalendarPage = () => {
         setItem({ ...item, data: result.substr(result.indexOf(',') + 1) });
       };
       reader.readAsDataURL(files[0]);
-    } else {
-      setItem({ ...item, data: null });
     }
   };
 
@@ -46,6 +96,7 @@ const CalendarPage = () => {
       endpoint="calendars"
       item={item}
       setItem={setItem}
+      defaultItem={{ data: simpleCalendar() }}
       validate={validate}
       menu={<SettingsMenu />}
       breadcrumbs={['settingsTitle', 'sharedCalendar']}
@@ -64,12 +115,75 @@ const CalendarPage = () => {
                 onChange={(event) => setItem({ ...item, name: event.target.value })}
                 label={t('sharedName')}
               />
-              <DropzoneArea
-                dropzoneText={t('sharedDropzoneText')}
-                filesLimit={1}
-                onChange={handleFiles}
-                showAlerts={false}
-              />
+              <FormControl>
+                <InputLabel>{t('sharedType')}</InputLabel>
+                <Select
+                  label={t('sharedType')}
+                  value={simple ? 'simple' : 'custom'}
+                  onChange={(e) => setItem({ ...item, data: (e.target.value === 'simple' ? simpleCalendar() : null) })}
+                >
+                  <MenuItem value="simple">{t('calendarSimple')}</MenuItem>
+                  <MenuItem value="custom">{t('reportCustom')}</MenuItem>
+                </Select>
+              </FormControl>
+              {simple ? (
+                <>
+                  <TextField
+                    label={t('reportFrom')}
+                    type="datetime-local"
+                    value={moment(lines[5].slice(-15)).locale('en').format(moment.HTML5_FMT.DATETIME_LOCAL)}
+                    onChange={(e) => {
+                      const time = formatTime(moment(e.target.value, moment.HTML5_FMT.DATETIME_LOCAL));
+                      setItem({ ...item, data: updateCalendar(lines, 5, `DTSTART;${time}`) });
+                    }}
+                  />
+                  <TextField
+                    label={t('reportTo')}
+                    type="datetime-local"
+                    value={moment(lines[6].slice(-15)).locale('en').format(moment.HTML5_FMT.DATETIME_LOCAL)}
+                    onChange={(e) => {
+                      const time = formatTime(moment(e.target.value, moment.HTML5_FMT.DATETIME_LOCAL));
+                      setItem({ ...item, data: updateCalendar(lines, 6, `DTEND;${time}`) });
+                    }}
+                  />
+                  <FormControl>
+                    <InputLabel>{t('calendarRecurrence')}</InputLabel>
+                    <Select
+                      label={t('calendarRecurrence')}
+                      value={rule.frequency}
+                      onChange={(e) => setItem({ ...item, data: updateCalendar(lines, 7, formatRule({ frequency: e.target.value })) })}
+                    >
+                      {['ONCE', 'DAILY', 'WEEKLY', 'MONTHLY'].map((it) => (
+                        <MenuItem key={it} value={it}>{t(prefixString('calendar', it.toLowerCase()))}</MenuItem>
+                      ))}
+                    </Select>
+                  </FormControl>
+                  {['WEEKLY', 'MONTHLY'].includes(rule.frequency) && (
+                    <FormControl>
+                      <InputLabel>{t('calendarDays')}</InputLabel>
+                      <Select
+                        multiple
+                        label={t('calendarDays')}
+                        value={rule.by}
+                        onChange={(e) => setItem({ ...item, data: updateCalendar(lines, 7, formatRule({ ...rule, by: e.target.value })) })}
+                      >
+                        {rule.frequency === 'WEEKLY' ? ['sunday', 'monday', 'tuesday', 'wednesday', 'thursday', 'friday', 'saturday'].map((it) => (
+                          <MenuItem key={it} value={it.substring(0, 2).toUpperCase()}>{t(prefixString('calendar', it))}</MenuItem>
+                        )) : Array.from({ length: 31 }, (_, i) => i + 1).map((it) => (
+                          <MenuItem key={it} value={it}>{it}</MenuItem>
+                        ))}
+                      </Select>
+                    </FormControl>
+                  )}
+                </>
+              ) : (
+                <DropzoneArea
+                  dropzoneText={t('sharedDropzoneText')}
+                  filesLimit={1}
+                  onChange={handleFiles}
+                  showAlerts={false}
+                />
+              )}
             </AccordionDetails>
           </Accordion>
           <EditAttributesAccordion
diff --git a/web/l10n/en.json b/web/l10n/en.json
index c23cb402..2f2ee27b 100644
--- a/web/l10n/en.json
+++ b/web/l10n/en.json
@@ -96,6 +96,20 @@
     "sharedImport": "Import",
     "sharedColumns": "Columns",
     "sharedDropzoneText": "Drag and drop a file here or click",
+    "calendarSimple": "Simple",
+    "calendarRecurrence": "Recurrence",
+    "calendarOnce": "Once",
+    "calendarDaily": "Daily",
+    "calendarWeekly": "Weekly",
+    "calendarMonthly": "Monthly",
+    "calendarDays": "Days",
+    "calendarSunday": "Sunday",
+    "calendarMonday": "Monday",
+    "calendarTuesday": "Tuesday",
+    "calendarWednesday": "Wednesday",
+    "calendarThursday": "Thursday",
+    "calendarFriday": "Friday",
+    "calendarSaturday": "Saturday",
     "attributeSpeedLimit": "Speed Limit",
     "attributeFuelDropThreshold": "Fuel Drop Threshold",
     "attributeFuelIncreaseThreshold": "Fuel Increase Threshold",
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