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fluxer_app/src/components/modals/ScheduleMessageModal.tsx

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+/*
+ * Copyright (C) 2026 Fluxer Contributors
+ *
+ * This file is part of Fluxer.
+ *
+ * Fluxer is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Fluxer is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with Fluxer. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+import {useLingui} from '@lingui/react/macro';
+import React from 'react';
+import {Input} from '~/components/form/Input';
+import {Select, type SelectOption} from '~/components/form/Select';
+import styles from '~/components/modals/ConfirmModal.module.css';
+import * as Modal from '~/components/modals/Modal';
+import {Button} from '~/components/uikit/Button/Button';
+
+interface ScheduleMessageModalProps {
+	onClose: () => void;
+	onSubmit: (scheduledLocalAt: string, timezone: string) => Promise<void>;
+	initialScheduledLocalAt?: string;
+	initialTimezone?: string;
+	title?: string;
+	submitLabel?: string;
+	helpText?: React.ReactNode;
+}
+
+const formatInputValue = (value: Date): string => value.toISOString().slice(0, 16);
+
+export const ScheduleMessageModal = ({
+	onClose,
+	onSubmit,
+	initialScheduledLocalAt,
+	initialTimezone,
+	title,
+	submitLabel,
+	helpText,
+}: ScheduleMessageModalProps) => {
+	const {t} = useLingui();
+	const minDateTime = React.useMemo(() => formatInputValue(new Date(Date.now() + 60_000)), []);
+	const maxDateTime = React.useMemo(() => formatInputValue(new Date(Date.now() + 30 * 24 * 60 * 60 * 1000)), []);
+	const defaultTimezone = React.useMemo(() => Intl.DateTimeFormat().resolvedOptions().timeZone, []);
+	const timezoneOptions = React.useMemo((): Array<SelectOption<string>> => {
+		const intl = Intl as typeof Intl & {supportedValuesOf?: (type: string) => Array<string>};
+		const zones = typeof intl.supportedValuesOf === 'function' ? intl.supportedValuesOf('timeZone') : [defaultTimezone];
+		return zones.map((zone) => ({value: zone, label: zone}));
+	}, [defaultTimezone]);
+
+	const initialScheduledAt = React.useMemo(
+		() => initialScheduledLocalAt ?? formatInputValue(new Date(Date.now() + 5 * 60 * 1000)),
+		[initialScheduledLocalAt],
+	);
+	const [scheduledLocalAt, setScheduledLocalAt] = React.useState(initialScheduledAt);
+	const [timezone, setTimezone] = React.useState(initialTimezone ?? defaultTimezone);
+	React.useEffect(() => {
+		setScheduledLocalAt(initialScheduledLocalAt ?? formatInputValue(new Date(Date.now() + 5 * 60 * 1000)));
+	}, [initialScheduledLocalAt]);
+	React.useEffect(() => {
+		if (initialTimezone) {
+			setTimezone(initialTimezone);
+		}
+	}, [initialTimezone]);
+	const [submitting, setSubmitting] = React.useState(false);
+
+	const handleConfirm = React.useCallback(async () => {
+		if (!scheduledLocalAt) {
+			return;
+		}
+		setSubmitting(true);
+		try {
+			await onSubmit(scheduledLocalAt, timezone);
+			onClose();
+		} finally {
+			setSubmitting(false);
+		}
+	}, [scheduledLocalAt, timezone, onSubmit, onClose]);
+
+	return (
+		<Modal.Root size="small" centered onClose={onClose}>
+			<Modal.Header title={title ?? t`Schedule Message`} />
+			<Modal.Content className={styles.content}>
+				<span className={styles.descriptionText}>{helpText ?? t`Pick a time when this message should be posted.`}</span>
+
+				<div className={styles.inputContainer}>
+					<Input
+						id="schedule-message-time"
+						type="datetime-local"
+						label={t`Date & time`}
+						min={minDateTime}
+						max={maxDateTime}
+						value={scheduledLocalAt}
+						onChange={(event) => setScheduledLocalAt(event.target.value)}
+					/>
+
+					<Select
+						id="schedule-message-timezone"
+						label={t`Timezone`}
+						description={t`Scheduled messages can be at most 30 days in the future.`}
+						value={timezone}
+						options={timezoneOptions}
+						onChange={setTimezone}
+					/>
+				</div>
+			</Modal.Content>
+			<Modal.Footer>
+				<Button variant="secondary" onClick={onClose}>
+					{t`Cancel`}
+				</Button>
+				<Button variant="primary" onClick={handleConfirm} submitting={submitting} disabled={!scheduledLocalAt}>
+					{submitLabel ?? t`Schedule`}
+				</Button>
+			</Modal.Footer>
+		</Modal.Root>
+	);
+};