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<script lang="ts">
	import { Search, X } from '@lucide/svelte';
	import { Button } from '$lib/components/ui/button';
	import { Input } from '$lib/components/ui/input';
	import { Checkbox } from '$lib/components/ui/checkbox';
	import { ScrollArea } from '$lib/components/ui/scroll-area';
	import { SvelteSet } from 'svelte/reactivity';

	interface Props {
		conversations: DatabaseConversation[];
		messageCountMap?: Map<string, number>;
		mode: 'export' | 'import';
		onCancel: () => void;
		onConfirm: (selectedConversations: DatabaseConversation[]) => void;
	}

	let { conversations, messageCountMap = new Map(), mode, onCancel, onConfirm }: Props = $props();

	let searchQuery = $state('');
	let selectedIds = $state.raw<SvelteSet<string>>(getInitialSelectedIds());
	let lastClickedId = $state<string | null>(null);

	function getInitialSelectedIds(): SvelteSet<string> {
		return new SvelteSet(conversations.map((c) => c.id));
	}

	let filteredConversations = $derived(
		conversations.filter((conv) => {
			const name = conv.name || 'Untitled conversation';
			return name.toLowerCase().includes(searchQuery.toLowerCase());
		})
	);

	let allSelected = $derived(
		filteredConversations.length > 0 &&
			filteredConversations.every((conv) => selectedIds.has(conv.id))
	);

	let someSelected = $derived(
		filteredConversations.some((conv) => selectedIds.has(conv.id)) && !allSelected
	);

	function toggleConversation(id: string, shiftKey: boolean = false) {
		const newSet = new SvelteSet(selectedIds);

		if (shiftKey && lastClickedId !== null) {
			const lastIndex = filteredConversations.findIndex((c) => c.id === lastClickedId);
			const currentIndex = filteredConversations.findIndex((c) => c.id === id);

			if (lastIndex !== -1 && currentIndex !== -1) {
				const start = Math.min(lastIndex, currentIndex);
				const end = Math.max(lastIndex, currentIndex);

				const shouldSelect = !newSet.has(id);

				for (let i = start; i <= end; i++) {
					if (shouldSelect) {
						newSet.add(filteredConversations[i].id);
					} else {
						newSet.delete(filteredConversations[i].id);
					}
				}

				selectedIds = newSet;
				return;
			}
		}

		if (newSet.has(id)) {
			newSet.delete(id);
		} else {
			newSet.add(id);
		}

		selectedIds = newSet;
		lastClickedId = id;
	}

	function toggleAll() {
		if (allSelected) {
			const newSet = new SvelteSet(selectedIds);

			filteredConversations.forEach((conv) => newSet.delete(conv.id));
			selectedIds = newSet;
		} else {
			const newSet = new SvelteSet(selectedIds);

			filteredConversations.forEach((conv) => newSet.add(conv.id));
			selectedIds = newSet;
		}
	}

	function handleConfirm() {
		const selected = conversations.filter((conv) => selectedIds.has(conv.id));
		onConfirm(selected);
	}

	function handleCancel() {
		selectedIds = getInitialSelectedIds();
		searchQuery = '';
		lastClickedId = null;

		onCancel();
	}

	export function reset() {
		selectedIds = getInitialSelectedIds();
		searchQuery = '';
		lastClickedId = null;
	}
</script>

<div class="space-y-4">

	<div class="relative">

		<Search class="absolute top-1/2 left-3 h-4 w-4 -translate-y-1/2 text-muted-foreground" />



		<Input bind:value={searchQuery} placeholder="Search conversations..." class="pr-9 pl-9" />



		{#if searchQuery}

			<button

				class="absolute top-1/2 right-3 -translate-y-1/2 text-muted-foreground hover:text-foreground"

				onclick={() => (searchQuery = '')}

				type="button"

			>

				<X class="h-4 w-4" />

			</button>

		{/if}

	</div>



	<div class="flex items-center justify-between text-sm text-muted-foreground">

		<span>

			{selectedIds.size} of {conversations.length} selected

			{#if searchQuery}

				({filteredConversations.length} shown)

			{/if}

		</span>

	</div>



	<div class="overflow-hidden rounded-md border">

		<ScrollArea class="h-[400px]">

			<table class="w-full">

				<thead class="sticky top-0 z-10 bg-muted">

					<tr class="border-b">

						<th class="w-12 p-3 text-left">

							<Checkbox

								checked={allSelected}

								indeterminate={someSelected}

								onCheckedChange={toggleAll}

							/>

						</th>



						<th class="p-3 text-left text-sm font-medium">Conversation Name</th>



						<th class="w-32 p-3 text-left text-sm font-medium">Messages</th>

					</tr>

				</thead>

				<tbody>

					{#if filteredConversations.length === 0}

						<tr>

							<td colspan="3" class="p-8 text-center text-sm text-muted-foreground">

								{#if searchQuery}

									No conversations found matching "{searchQuery}"

								{:else}

									No conversations available

								{/if}

							</td>

						</tr>

					{:else}

						{#each filteredConversations as conv (conv.id)}

							<tr

								class="cursor-pointer border-b transition-colors hover:bg-muted/50"

								onclick={(e) => toggleConversation(conv.id, e.shiftKey)}

							>

								<td class="p-3">

									<Checkbox

										checked={selectedIds.has(conv.id)}

										onclick={(e) => {

											e.preventDefault();

											e.stopPropagation();

											toggleConversation(conv.id, e.shiftKey);

										}}

									/>

								</td>



								<td class="p-3 text-sm">

									<div class="max-w-[17rem] truncate" title={conv.name || 'Untitled conversation'}>

										{conv.name || 'Untitled conversation'}

									</div>

								</td>



								<td class="p-3 text-sm text-muted-foreground">

									{messageCountMap.get(conv.id) ?? 0}

								</td>

							</tr>

						{/each}

					{/if}

				</tbody>

			</table>

		</ScrollArea>

	</div>



	<div class="flex justify-end gap-2">

		<Button variant="outline" onclick={handleCancel}>Cancel</Button>



		<Button onclick={handleConfirm} disabled={selectedIds.size === 0}>

			{mode === 'export' ? 'Export' : 'Import'} ({selectedIds.size})

		</Button>

	</div>

</div>