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<script lang="ts">
	import type i18nType from '$lib/i18n';
	import { getContext } from 'svelte';

	import Dropdown from '$lib/components/common/Dropdown.svelte';

	const i18n: typeof i18nType = getContext('i18n');

	export let frequency = 'DAILY';
	export let interval = 1;
	export let hour = 9;
	export let minute = 0;
	export let selectedDays: string[] = [];
	export let monthDay = 1;
	export let onceDate = '';
	export let onceTime = '09:00';
	export let customRrule = '';

	export let side: 'top' | 'bottom' = 'top';
	export let align: 'start' | 'end' = 'start';

	/** Optional callback when any value changes */
	export let onChange: () => void = () => {};

	let showDropdown = false;

	$: FREQUENCIES = [
		{ key: 'ONCE', label: $i18n.t('Once') },
		{ key: 'HOURLY', label: $i18n.t('Hourly') },
		{ key: 'DAILY', label: $i18n.t('Daily') },
		{ key: 'WEEKLY', label: $i18n.t('Weekly') },
		{ key: 'MONTHLY', label: $i18n.t('Monthly') },
		{ key: 'CUSTOM', label: $i18n.t('Custom') }
	];

	$: DAYS = [
		{ key: 'MO', label: $i18n.t('Mo', { context: 'day_of_week' }) },
		{ key: 'TU', label: $i18n.t('Tu', { context: 'day_of_week' }) },
		{ key: 'WE', label: $i18n.t('We', { context: 'day_of_week' }) },
		{ key: 'TH', label: $i18n.t('Th', { context: 'day_of_week' }) },
		{ key: 'FR', label: $i18n.t('Fr', { context: 'day_of_week' }) },
		{ key: 'SA', label: $i18n.t('Sa', { context: 'day_of_week' }) },
		{ key: 'SU', label: $i18n.t('Su', { context: 'day_of_week' }) }
	];

	let lastVisualFrequency = 'DAILY';
	let prevFrequency = 'DAILY';

	$: if (frequency !== 'CUSTOM') {
		lastVisualFrequency = frequency;
	}

	$: if (frequency === 'ONCE' && !onceDate) {
		const soon = new Date(Date.now() + 5 * 60_000);
		onceDate = soon.toISOString().split('T')[0];
		onceTime = `${String(soon.getHours()).padStart(2, '0')}:${String(soon.getMinutes()).padStart(2, '0')}`;
	}

	$: {
		if (frequency === 'CUSTOM' && prevFrequency !== 'CUSTOM') {
			customRrule = buildVisualRrule();
		}
		prevFrequency = frequency;
	}

	const buildVisualRrule = (): string => {
		if (lastVisualFrequency === 'ONCE') {
			const dt = onceDate.replace(/-/g, '') + 'T' + onceTime.replace(/:/g, '') + '00';
			return `DTSTART:${dt}\nRRULE:FREQ=DAILY;COUNT=1`;
		}
		let parts = [`FREQ=${lastVisualFrequency}`];
		if (interval > 1) parts.push(`INTERVAL=${interval}`);
		if (lastVisualFrequency === 'WEEKLY' && selectedDays.length) {
			parts.push(`BYDAY=${selectedDays.join(',')}`);
		}
		if (lastVisualFrequency === 'MONTHLY') {
			parts.push(`BYMONTHDAY=${monthDay}`);
		}
		if (['DAILY', 'WEEKLY', 'MONTHLY'].includes(lastVisualFrequency)) {
			parts.push(`BYHOUR=${hour}`);
		}
		parts.push(`BYMINUTE=${minute}`);
		return `RRULE:${parts.join(';')}`;
	};

	export const buildRrule = (): string => {
		if (frequency === 'CUSTOM') return customRrule;
		if (frequency === 'ONCE') {
			const dt = onceDate.replace(/-/g, '') + 'T' + onceTime.replace(/:/g, '') + '00';
			return `DTSTART:${dt}\nRRULE:FREQ=DAILY;COUNT=1`;
		}
		let parts = [`FREQ=${frequency}`];
		if (interval > 1) parts.push(`INTERVAL=${interval}`);
		if (frequency === 'WEEKLY' && selectedDays.length) {
			parts.push(`BYDAY=${selectedDays.join(',')}`);
		}
		if (frequency === 'MONTHLY') {
			parts.push(`BYMONTHDAY=${monthDay}`);
		}
		if (['DAILY', 'WEEKLY', 'MONTHLY'].includes(frequency)) {
			parts.push(`BYHOUR=${hour}`);
		}
		parts.push(`BYMINUTE=${minute}`);
		return `RRULE:${parts.join(';')}`;
	};

	export const parseRrule = (s: string) => {
		// Detect ONCE (COUNT=1 with DTSTART)
		if (s.includes('COUNT=1')) {
			frequency = 'ONCE';
			const match = s.match(/DTSTART:(\d{4})(\d{2})(\d{2})T(\d{2})(\d{2})/);
			if (match) {
				onceDate = `${match[1]}-${match[2]}-${match[3]}`;
				onceTime = `${match[4]}:${match[5]}`;
			}
			return;
		}
		const parts: Record<string, string> = {};
		s.replace('RRULE:', '')
			.split(';')
			.forEach((p) => {
				const [k, v] = p.split('=');
				if (k && v) parts[k] = v;
			});
		const freq = parts.FREQ || 'DAILY';
		if (!['HOURLY', 'DAILY', 'WEEKLY', 'MONTHLY'].includes(freq)) {
			frequency = 'CUSTOM';
			customRrule = s;
			return;
		}
		frequency = freq;
		interval = parseInt(parts.INTERVAL || '1');
		hour = parseInt(parts.BYHOUR || '9');
		minute = parseInt(parts.BYMINUTE || '0');
		selectedDays = parts.BYDAY ? parts.BYDAY.split(',') : [];
		monthDay = parseInt(parts.BYMONTHDAY || '1');
	};

	export const getScheduleLabel = (): string => {
		if (frequency === 'ONCE') return 'Once';
		if (frequency === 'HOURLY') return 'Hourly';
		if (frequency === 'DAILY') return 'Daily';
		if (frequency === 'WEEKLY') return 'Weekly';
		if (frequency === 'MONTHLY') return 'Monthly';
		if (frequency === 'CUSTOM') return 'Custom';
		return 'Schedule';
	};

	$: scheduleLabel = (() => {
		if (frequency === 'ONCE') return 'Once';
		if (frequency === 'HOURLY') return 'Hourly';
		if (frequency === 'DAILY') return 'Daily';
		if (frequency === 'WEEKLY') return 'Weekly';
		if (frequency === 'MONTHLY') return 'Monthly';
		if (frequency === 'CUSTOM') return 'Custom';
		return 'Schedule';
	})();
</script>

<Dropdown bind:show={showDropdown} {side} {align}>
	<button
		type="button"
		class="flex items-center gap-1.5 px-2.5 py-1.5 rounded-2xl text-xs transition
			text-gray-600 dark:text-gray-400 hover:bg-black/5 dark:hover:bg-white/5"
	>
		<svg
			xmlns="http://www.w3.org/2000/svg"
			fill="none"
			viewBox="0 0 24 24"
			stroke-width="1.5"
			stroke="currentColor"
			class="size-3.5"
		>
			<path
				stroke-linecap="round"
				stroke-linejoin="round"
				d="M12 6v6h4.5m4.5 0a9 9 0 1 1-18 0 9 9 0 0 1 18 0Z"
			/>
		</svg>
		<span class="whitespace-nowrap">{scheduleLabel}</span>
		<svg
			xmlns="http://www.w3.org/2000/svg"
			fill="none"
			viewBox="0 0 24 24"
			stroke-width="2"
			stroke="currentColor"
			class="size-2.5"
		>
			<path stroke-linecap="round" stroke-linejoin="round" d="m19.5 8.25-7.5 7.5-7.5-7.5" />
		</svg>
	</button>

	<div
		slot="content"
		class="rounded-2xl shadow-lg border border-gray-200 dark:border-gray-800 flex flex-col bg-white dark:bg-gray-850 w-48 p-1"
	>
		<div class="px-2 text-xs text-gray-500 pt-1">
			{$i18n.t('Schedule')}
		</div>

		<div class="px-1.5 py-0.5">
			<select
				class="w-full bg-transparent rounded-xl text-xs py-1.5 px-1.5 outline-hidden"
				bind:value={frequency}
				on:click={(e) => e.stopPropagation()}
				on:change={onChange}
			>
				{#each FREQUENCIES as f}
					<option value={f.key}>{f.label}</option>
				{/each}
			</select>
		</div>

		{#if frequency === 'CUSTOM'}
			<div class="px-2 pb-2">
				<input
					type="text"
					bind:value={customRrule}
					placeholder="RRULE:FREQ=DAILY;BYHOUR=9;BYMINUTE=0"
					class="w-full bg-transparent outline-hidden text-xs placeholder:text-gray-400 dark:placeholder:text-gray-600"
					on:click={(e) => e.stopPropagation()}
					on:input={onChange}
				/>
			</div>
		{:else if frequency !== 'HOURLY'}
			<div class="flex gap-2 flex-wrap items-center px-3 pb-2 text-xs">
				{#if frequency === 'ONCE'}
					<div class="flex items-center gap-1.5">
						<input
							type="date"
							bind:value={onceDate}
							min={new Date().toISOString().split('T')[0]}
							class="bg-transparent outline-hidden text-xs dark:color-scheme-dark"
							on:click={(e) => e.stopPropagation()}
							on:input={onChange}
						/>
					</div>
					<div class="flex items-center gap-1.5">
						<input
							type="time"
							bind:value={onceTime}
							class="bg-transparent outline-hidden text-xs dark:color-scheme-dark"
							on:click={(e) => e.stopPropagation()}
							on:input={onChange}
						/>
					</div>
				{:else}
					<div class="flex items-center gap-1.5">
						<span class="text-xs text-gray-500 mr-0.5">{$i18n.t('Time')}</span>
						<input
							type="time"
							value={`${String(hour).padStart(2, '0')}:${String(minute).padStart(2, '0')}`}
							on:input={(e) => {
								const [h, m] = e.currentTarget.value.split(':').map(Number);
								hour = h;
								minute = m;
								onChange();
							}}
							class="bg-transparent text-center outline-hidden text-xs dark:color-scheme-dark"
							on:click={(e) => e.stopPropagation()}
						/>
					</div>
				{/if}

				{#if frequency === 'MONTHLY'}
					<div class="flex items-center gap-1.5">
						<span class="text-xs text-gray-500">{$i18n.t('Day')}</span>
						<input
							type="number"
							bind:value={monthDay}
							min={1}
							max={31}
							class="w-8 bg-transparent text-center outline-hidden text-xs"
							on:click={(e) => e.stopPropagation()}
							on:input={onChange}
						/>
					</div>
				{/if}
			</div>

			{#if frequency === 'WEEKLY'}
				<div class="flex gap-1 px-2 pb-2">
					{#each DAYS as d}
						<button
							type="button"
							class="flex-1 py-1 text-xs rounded-xl transition {selectedDays.includes(d.key)
								? 'bg-gray-50 dark:bg-gray-800 text-black dark:text-gray-100'
								: 'text-gray-400 dark:text-gray-500 hover:text-gray-700 dark:hover:text-gray-200'}"
							on:click={() => {
								if (selectedDays.includes(d.key)) {
									selectedDays = selectedDays.filter((x) => x !== d.key);
								} else {
									selectedDays = [...selectedDays, d.key];
								}
								onChange();
							}}
						>
							{d.label}
						</button>
					{/each}
				</div>
			{/if}
		{/if}
	</div>
</Dropdown>