From 9e278bd68ce98afc5d830d58e9e44bfed876943a Mon Sep 17 00:00:00 2001
From: kernoeb <kernoeb@protonmail.com>
Date: Fri, 19 Jan 2024 22:57:29 +0100
Subject: [PATCH] time zone management (#62)

* temp fix: convert date with a custom time zone

* feat: settings to change timezone

* Update calendar.js
---
 components/DialogSettings.vue | 64 ++++++++++++++++++++++++++++++++++-
 server/routes/calendar.js     | 14 ++++++--
 server/util/utils.js          | 25 ++++++++++++--
 3 files changed, 97 insertions(+), 6 deletions(-)

diff --git a/components/DialogSettings.vue b/components/DialogSettings.vue
index 9eafdf0..471c5cf 100644
--- a/components/DialogSettings.vue
+++ b/components/DialogSettings.vue
@@ -256,6 +256,45 @@
 
           <v-divider />
 
+          <v-subheader
+            class="mt-3"
+            style="height: 20px"
+          >
+            Utiliser une timezone personnalisée
+          </v-subheader>
+          <v-list-item
+            inactive
+            :ripple="false"
+            class="mb-2"
+          >
+            <v-list-item-content class="pt-0">
+              <div class="d-flex flex-row">
+                <v-text-field
+                  v-model="localeUtils.oldTZ"
+                  hide-details
+                  placeholder="Europe/Paris"
+                  class="mr-2"
+                  @change="$nextTick(() => updateLocaleUtils({oldTZ: $event || null, newTZ: localeUtils.newTZ || null}))"
+                />
+                <v-icon
+                  small
+                  :disabled="!localeUtils.oldTZ"
+                  class="align-self-end mr-2"
+                >
+                  {{ mdiArrowRightCircleOutline }}
+                </v-icon>
+                <v-text-field
+                  v-model="localeUtils.newTZ"
+                  hide-details
+                  placeholder="America/New_York"
+                  @change="$nextTick(() => updateLocaleUtils({oldTZ: localeUtils.oldTZ || null, newTZ: $event || null}))"
+                />
+              </div>
+            </v-list-item-content>
+          </v-list-item>
+
+          <v-divider />
+
           <div>
             <v-subheader>FAQ / Aide</v-subheader>
             <lazy-help-info style="width: 98%;" />
@@ -304,7 +343,7 @@
 </template>
 
 <script>
-import { mdiClose, mdiCheckboxBlankOutline, mdiCheckboxMarked, mdiCogOutline, mdiMail, mdiMenuDown, mdiTwitter } from '@mdi/js'
+import { mdiClose, mdiCheckboxBlankOutline, mdiCheckboxMarked, mdiCogOutline, mdiMail, mdiMenuDown, mdiTwitter, mdiArrowRightCircleOutline } from '@mdi/js'
 
 export default {
   name: 'DialogSettings',
@@ -332,10 +371,13 @@ export default {
       mdiCheckboxBlankOutline,
       mdiCheckboxMarked,
       mdiClose,
+      mdiArrowRightCircleOutline,
 
       blocklist: ['Maths', 'Communication', 'Férié'], // Oui, bon...
       blocklistSelect: [],
 
+      localeUtils: {},
+
       colorTP: '#bbe0ff',
       colorTD: '#d4fbcc',
       colorAmphi: '#efd6d8',
@@ -421,6 +463,19 @@ export default {
       if (c.other) this.colorOthers = c.other
     } catch (err) {}
 
+    if (this.$cookies.get('locale-utils') !== undefined) {
+      try {
+        const tmp = this.$cookies.get('locale-utils', { parseJSON: true })
+        if (tmp && Object.keys(tmp).length > 0 && tmp.oldTZ && tmp.newTZ) {
+          this.localeUtils = tmp
+        } else {
+          this.$cookies.remove('locale-utils')
+        }
+      } catch (e) {
+        this.$cookies.remove('locale-utils')
+      }
+    }
+
     try {
       const highlightTeacher = this.$cookies.get('highlightTeacher', { parseJSON: true })
       if (typeof highlightTeacher === 'boolean') this.highlightTeacher = highlightTeacher
@@ -471,6 +526,13 @@ export default {
       } catch (err) {
       }
     },
+    updateLocaleUtils (event) {
+      try {
+        this.$cookies.set('locale-utils', JSON.stringify(event), { maxAge: 2147483646 })
+        if ((event.oldTZ && event.newTZ) || (!event.oldTZ && !event.newTZ)) this.delayedFetch()
+      } catch (err) {
+      }
+    },
     setColor (type, color) {
       try {
         const tmpCookie = this.$cookies.get('customColorList') || {}
diff --git a/server/routes/calendar.js b/server/routes/calendar.js
index 09e7608..7441dae 100644
--- a/server/routes/calendar.js
+++ b/server/routes/calendar.js
@@ -45,6 +45,16 @@ router.get('/calendars', asyncWrapper(async (req, res) => {
     if (Object.keys(customColorList).length === 0) customColorList = null
   } catch (e) {}
 
+  // Get custom timezone and locale
+  let localeUtils = null
+  try {
+    if (req.cookies?.['locale-utils']) {
+      const { oldTZ, newTZ } = JSON.parse(req.cookies['locale-utils'])
+      if (oldTZ && newTZ) localeUtils = { oldTZ, newTZ }
+    }
+  } catch (e) {
+  }
+
   // Highlight courses with teachers
   let highlightTeacher = false
   try {
@@ -68,7 +78,7 @@ router.get('/calendars', asyncWrapper(async (req, res) => {
           status: 'ok',
           title: allPlannings[id].title,
           timestamp: new Date().toISOString(),
-          events: getFormattedEvents({ data: fetched, blocklist, colors: customColorList, highlightTeacher })
+          events: getFormattedEvents({ data: fetched, blocklist, colors: customColorList, localeUtils, highlightTeacher })
         }
       } else {
         const backed = await getBackedPlanning(id)
@@ -78,7 +88,7 @@ router.get('/calendars', asyncWrapper(async (req, res) => {
             status: 'backup',
             title: allPlannings[id].title,
             timestamp: backed.timestamp || undefined,
-            events: getFormattedEvents({ data: backed.backup, blocklist, colors: customColorList, highlightTeacher })
+            events: getFormattedEvents({ data: backed.backup, blocklist, colors: customColorList, localeUtils, highlightTeacher })
           }
         } else {
           return { id, title: allPlannings[id].title, status: 'off' }
diff --git a/server/util/utils.js b/server/util/utils.js
index 2c90e2a..df8144d 100644
--- a/server/util/utils.js
+++ b/server/util/utils.js
@@ -4,6 +4,7 @@ const { Planning } = require('../models/planning')
 const { CustomEvent } = require('../models/customevent')
 const http = require('./http')
 const logger = require('./signale')
+const { DateTime } = require('luxon')
 
 const dateStartTemplate = '{date-start}'
 const dateEndTemplate = '{date-end}'
@@ -84,6 +85,23 @@ const cleanName = (name) => {
   return (name && name.replace(/([A-Za-z])\?([A-Za-z])/gi, (_, b, c) => b + "'" + c).trim()) || ''
 }
 
+/**
+ * Get date
+ * @param {Date} date
+ * @param {{newTZ: string, oldTZ: string}|null} localeUtils
+ * @returns {number}
+ */
+const getDate = (date, localeUtils) => {
+  if (!localeUtils || !localeUtils.oldTZ || !localeUtils.newTZ) return date.getTime() // default behavior
+  try {
+    const tmpDate = DateTime.fromJSDate(date, { zone: localeUtils.oldTZ }).setZone(localeUtils.newTZ, { keepLocalTime: true }).toMillis()
+    if (!isNaN(tmpDate)) return tmpDate
+    return date.getTime()
+  } catch (err) {
+    return date.getTime()
+  }
+}
+
 module.exports = {
   /**
    * Get custom events for a planning
@@ -117,17 +135,18 @@ module.exports = {
    * @param {object} j
    * @param {string[]} blocklist
    * @param {object} colors
+   * @param {object|null} localeUtils
    * @param {boolean} highlightTeacher
    * @returns {[]}
    */
-  getFormattedEvents: ({ data: j, blocklist, colors, highlightTeacher }) => {
+  getFormattedEvents: ({ data: j, blocklist, colors, localeUtils, highlightTeacher }) => {
     const events = []
     for (const i of j.events || j) {
       if (!blocklist.some(str => i.summary.value.toUpperCase().includes(str))) {
         events.push({
           name: cleanName(i.summary.value),
-          start: new Date(i.dtstart.value).getTime(),
-          end: new Date(i.dtend.value).getTime(),
+          start: getDate(new Date(i.dtstart.value), localeUtils),
+          end: getDate(new Date(i.dtend.value), localeUtils),
           color: getColor(i.summary.value, i.location.value, i.description.value, { customColor: colors, highlightTeacher }),
           location: cleanLocation(i.location.value),
           description: cleanDescription(i.description.value),