feat(timezone): Adds timezone as option

source/Discord/Commands/Groups.ts

@@ -1,9 +1,10 @@
 import {
   AutocompleteInteraction,
   ChatInputCommandInteraction,
-  EmbedBuilder,
   GuildMember,
   GuildMemberRoleManager,
+  hyperlink,
+  inlineCode,
   InteractionReplyOptions,
   MessageFlags,
   PermissionFlagsBits,
@@ -35,8 +36,8 @@ import {PermissionError} from "../PermissionError";
 import {EmbedLibrary, EmbedType} from "../EmbedLibrary";
 import {EventHandler} from "../../Events/EventHandler";
 import {ElementChangedEvent} from "../../Events/EventClasses/ElementChangedEvent";
-import GroupConfiguration from "../../Database/tables/GroupConfiguration";
 import Groups from "../../Database/tables/Groups";
+import {TimezoneHandler, TimezoneSaveTarget} from "../../Configuration/TimezoneHandler";
 
 export class GroupCommand implements Command, ChatInteractionCommand, AutocompleteCommand {
   private static GOODBYE_MESSAGES: string[] = [
@@ -95,6 +96,16 @@ export class GroupCommand implements Command, ChatInteractionCommand, Autocomple
           .setDescription("The member, that is the new leader")
           .setRequired(true)
         )
+      )
+      .addSubcommand(command => command
+        .setName("timezone")
+        .setDescription("Sets the timezone for the group, if a value is provided. If not, the current timezone is displayed.")
+        .addIntegerOption(GroupSelection.createOptionSetup())
+        .addStringOption(option => option
+          .setName('timezone')
+          .setDescription("The timezone the group should use.")
+          .setRequired(false)
+        )
       );
   }
 
@@ -115,6 +126,9 @@ export class GroupCommand implements Command, ChatInteractionCommand, Autocomple
       case "transfer":
         await this.transferLeadership(interaction);
         break;
+      case "timezone":
+        await this.handleTimezone(interaction);
+        break;
       default:
         throw new Error("Unsupported command");
     }
@@ -395,4 +409,51 @@ export class GroupCommand implements Command, ChatInteractionCommand, Autocomple
       flags: MessageFlags.Ephemeral,
     })
   }
+
+  private async handleTimezone(interaction: ChatInputCommandInteraction) {
+    const group = GroupSelection.getGroup(interaction);
+    const enteredTimezone = interaction.options.getString('timezone');
+    
+    const timezoneHandler = new TimezoneHandler(
+      interaction.guildId ?? '',
+      group
+    );
+    if (!enteredTimezone) {
+      await interaction.reply(
+        {
+          embeds: [
+            EmbedLibrary.withGroup(
+              group,
+              "Timezone",
+              `The group currently uses the timezone ${inlineCode(timezoneHandler.getCurrentTimezone())}.`,
+              EmbedType.Info
+            )
+          ]
+        }
+      )
+      return;
+    }
+    
+    if (!TimezoneHandler.ALL_TIMEZONES.includes(enteredTimezone)) {
+      throw new UserError(
+        `Invalid timezone provided: ${enteredTimezone}`,
+        `Try using timezones found in this list using the 'TZ Identifier'. ${hyperlink("List", 'https://en.wikipedia.org/wiki/List_of_tz_database_time_zones#List')}`
+      )
+    }
+    
+    timezoneHandler.save(enteredTimezone, TimezoneSaveTarget.Group);
+    await interaction.reply(
+      {
+        embeds: [
+          EmbedLibrary.withGroup(
+            group,
+            "Timezone changed",
+            `The group now uses the timezone ${inlineCode(enteredTimezone)}.`,
+            EmbedType.Info
+          )
+        ]
+      }
+    )
+    
+  }
 }