From cc01bd18b2f522352b53ee4c4b1c7bcbb9c41994 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Th=C3=A9o=20LUDWIG?= <contact@theoludwig.fr>
Date: Thu, 29 Jun 2023 23:03:03 +0200
Subject: [PATCH] feat(skill/date_time): time zone

---
 skills/utilities/date_time/config/en.json     | 16 +++++
 .../current_date_time_with_time_zone.ts       | 69 +++++++++++++++++++
 2 files changed, 85 insertions(+)
 create mode 100644 skills/utilities/date_time/src/actions/current_date_time_with_time_zone.ts

diff --git a/skills/utilities/date_time/config/en.json b/skills/utilities/date_time/config/en.json
index b7328c32..6b37da37 100644
--- a/skills/utilities/date_time/config/en.json
+++ b/skills/utilities/date_time/config/en.json
@@ -48,12 +48,25 @@
         "In how many days will it be February 10th?",
         "Calculate the number until March 1st"
       ]
+    },
+    "current_date_time_with_time_zone": {
+      "type": "logic",
+      "utterance_samples": [
+        "What is the time in San Francisco?",
+        "What time is it in Paris?",
+        "Can you tell me the current time in London?",
+        "What's the time right now in Tokyo?",
+        "What is the current date and time in New York City?"
+      ]
     }
   },
   "answers": {
     "current_date_time": [
       "It is %weekday%, %month% %day%, %year%, and it is %hours%:%minutes%:%seconds%."
     ],
+    "current_date_time_with_time_zone": [
+      "Greetings from %city%, %country%! The local date and time is %weekday%, %month% %day%, %year%, and it is %hours%:%minutes%:%seconds%."
+    ],
     "current_date": ["It is %weekday%, %month% %day%, %year%."],
     "current_time": ["It is %hours%:%minutes%:%seconds%."],
     "current_week_number": ["It is the %week_number% week of the year."],
@@ -62,6 +75,9 @@
     ],
     "days_countdown_error": [
       "I'm sorry, I didn't understand the date you said."
+    ],
+    "city_not_found": [
+      "I'm sorry, I couldn't find the city you said. Please try again."
     ]
   }
 }
diff --git a/skills/utilities/date_time/src/actions/current_date_time_with_time_zone.ts b/skills/utilities/date_time/src/actions/current_date_time_with_time_zone.ts
new file mode 100644
index 00000000..c4e0389b
--- /dev/null
+++ b/skills/utilities/date_time/src/actions/current_date_time_with_time_zone.ts
@@ -0,0 +1,69 @@
+import type { ActionFunction, SpacyLocationCityEntity } from '@sdk/types'
+import { leon } from '@sdk/leon'
+
+import { zeroPad } from '../lib/zeroPad'
+
+/**
+ * Determine if the given date is in Daylight Saving Time (DST).
+ * @example isDaylightSavingTime(new Date(2020, 0, 1)) // false
+ * @example isDaylightSavingTime(new Date(2020, 7, 1)) // true
+ */
+function isDaylightSavingTime(date: Date): boolean {
+  const january = new Date(date.getFullYear(), 0, 1).getTimezoneOffset()
+  const july = new Date(date.getFullYear(), 6, 1).getTimezoneOffset()
+  return Math.max(january, july) !== date.getTimezoneOffset()
+}
+
+/**
+ * Get the current date in Coordinated Universal Time (UTC).
+ */
+function getCurrentCoordinatedUniversalTime(): Date {
+  const currentDate = new Date()
+  const utcOffset = currentDate.getTimezoneOffset()
+  currentDate.setMinutes(currentDate.getMinutes() + utcOffset)
+  return currentDate
+}
+
+export const run: ActionFunction = async function (params) {
+  let cityEntity: SpacyLocationCityEntity | null = null
+  for (const entity of params.current_entities) {
+    if (entity.type === 'location:city') {
+      cityEntity = entity
+      break
+    }
+  }
+
+  if (cityEntity == null) {
+    return await leon.answer({
+      key: 'city_not_found'
+    })
+  }
+
+  const { time_zone } = cityEntity.resolution.data
+
+  const currentDate = getCurrentCoordinatedUniversalTime()
+  if (isDaylightSavingTime(currentDate)) {
+    currentDate.setHours(
+      currentDate.getHours() + time_zone.daylight_saving_time_offset
+    )
+  } else {
+    currentDate.setHours(
+      currentDate.getHours() + time_zone.coordinated_universal_time_offset
+    )
+  }
+
+  await leon.answer({
+    key: 'current_date_time_with_time_zone',
+    data: {
+      weekday: currentDate.toLocaleString(params.lang, { weekday: 'long' }),
+      month: currentDate.toLocaleString(params.lang, { month: 'long' }),
+      day: currentDate.getDate(),
+      year: currentDate.getFullYear(),
+      hours: zeroPad(currentDate.getHours()),
+      minutes: zeroPad(currentDate.getMinutes()),
+      seconds: zeroPad(currentDate.getSeconds()),
+      city: cityEntity.resolution.data.name,
+      country: time_zone.country_code
+    }
+  })
+}