<script lang="ts">
import { goto } from '$app/navigation';
import type { components } from '$lib/generated/api';
import { applyOffsets } from '$lib/document/search';
import DocumentDate from './DocumentDate.svelte';
import * as m from '$lib/paraglide/messages.js';
import { bulkSelectionStore } from '$lib/document/bulkSelection.svelte';
import ProgressRing from '$lib/shared/primitives/ProgressRing.svelte';
import ContributorStack from '$lib/shared/primitives/ContributorStack.svelte';
import DocumentThumbnail from './DocumentThumbnail.svelte';

type DocumentListItem = components['schemas']['DocumentListItem'];

let { item, canWrite = false }: { item: DocumentListItem; canWrite?: boolean } = $props();

const doc = $derived(item);
const titleText = $derived(doc.title || doc.originalFilename);
const titleOffsets = $derived(item.matchData?.titleOffsets ?? []);
const titleSegments = $derived(applyOffsets(titleText, titleOffsets));
const snippet = $derived(item.matchData?.transcriptionSnippet ?? null);
const snippetSegments = $derived(
	snippet ? applyOffsets(snippet, item.matchData?.snippetOffsets ?? []) : null
);
const summary = $derived(doc.summary?.trim() ? doc.summary : null);
const summarySegments = $derived(
	summary ? applyOffsets(summary, item.matchData?.summaryOffsets ?? []) : null
);
const archiveChips = $derived(
	[doc.archiveBox, doc.archiveFolder, doc.location].filter(
		(c): c is string => !!c && c.trim().length > 0
	)
);
const senderMatched = $derived(item.matchData?.senderMatched ?? false);
const matchedReceiverIds = $derived(new Set(item.matchData?.matchedReceiverIds ?? []));
const matchedTagIds = $derived(new Set(item.matchData?.matchedTagIds ?? []));
const hasMore = $derived(item.contributors.length >= 4);

function tagClass(matched: boolean): string {
	return matched
		? 'pointer-events-auto inline-flex items-center gap-1 rounded px-2 py-1.5 text-xs font-bold tracking-widest uppercase bg-primary text-primary-fg transition-colors'
		: 'pointer-events-auto inline-flex items-center gap-1 rounded px-2 py-1.5 text-xs font-bold tracking-widest uppercase bg-muted text-ink hover:bg-primary hover:text-primary-fg transition-colors';
}

function safeTagColor(color: string | null | undefined): string {
	return color && /^#[0-9a-fA-F]{6}$/.test(color) ? color : '#cdcbbf';
}
</script>

<li class="group relative transition-colors duration-200 hover:bg-muted/50">
	<!--
		Stretched-link pattern: the row-wide anchor sits as an overlay so it
		isn't a parent of interior interactive controls (tag buttons). Nesting
		<button> inside <a> is invalid HTML and was causing tag clicks to also
		fire the row navigation in real browsers.
	-->
	<a href="/documents/{doc.id}" aria-label={titleText} class="absolute inset-0 z-0 block"></a>
	<div class="pointer-events-none relative z-10 px-4 py-4 sm:py-5">
		<div class="flex gap-3 sm:gap-5">
			<!-- Bulk-selection checkbox -->
			{#if canWrite}
				<label
					class="pointer-events-auto flex min-h-[44px] min-w-[44px] flex-shrink-0 cursor-pointer items-start pt-1"
					data-testid="bulk-select-checkbox"
				>
					<input
						type="checkbox"
						class="h-5 w-5 cursor-pointer accent-brand-navy"
						checked={bulkSelectionStore.has(doc.id)}
						onchange={() => bulkSelectionStore.toggle(doc.id)}
						aria-label={m.bulk_edit_select_document({ title: titleText })}
					/>
				</label>
			{/if}
			<!-- Thumbnail tile -->
			<DocumentThumbnail doc={doc} size="lg" />

			<!-- Left column -->
			<div class="flex-1 sm:border-r sm:border-line sm:pr-5">
				<!-- Title -->
				<h3 class="mb-1 font-serif text-xl font-medium text-ink group-hover:underline">
					{#each titleSegments as seg, i (i)}
						{#if seg.highlight}
							<mark
								class="bg-transparent text-inherit underline decoration-brand-navy decoration-2 underline-offset-2"
								>{seg.text}</mark
							>
						{:else}
							{seg.text}
						{/if}
					{/each}
				</h3>

				<!-- Snippet -->
				{#if snippetSegments}
					<p
						data-testid="search-snippet"
						class="mb-2 line-clamp-2 font-sans text-sm text-ink-2 italic"
					>
						{#each snippetSegments as seg, i (i)}
							{#if seg.highlight}
								<mark
									class="bg-transparent text-inherit underline decoration-brand-navy decoration-2 underline-offset-2"
									>{seg.text}</mark
								>
							{:else}
								{seg.text}
							{/if}
						{/each}
					</p>
				{/if}

				<!-- Summary excerpt — only when populated -->
				{#if summarySegments}
					<p
						data-testid="doc-summary"
						class="mt-1 mb-2 line-clamp-2 font-serif text-sm text-ink-2 italic"
					>
						{#each summarySegments as seg, i (i)}
							{#if seg.highlight}
								<mark
									class="bg-transparent text-inherit underline decoration-brand-navy decoration-2 underline-offset-2"
									>{seg.text}</mark
								>
							{:else}
								{seg.text}
							{/if}
						{/each}
					</p>
				{/if}

				<!-- Archive metadata chips — desktop only -->
				{#if archiveChips.length > 0}
					<div class="mt-2 hidden flex-wrap items-center gap-1.5 sm:flex">
						{#each archiveChips as chip, i (i)}
							<span
								class="rounded border border-line px-1.5 py-0.5 font-sans text-[10px] tracking-widest text-ink-3 uppercase"
								>{chip}</span
							>
						{/each}
					</div>
				{/if}

				<!-- Tags -->
				{#if doc.tags && doc.tags.length > 0}
					<div class="mt-2 flex flex-wrap gap-1.5">
						{#each doc.tags as tag (tag.id)}
							<button
								type="button"
								class={tagClass(matchedTagIds.has(tag.id))}
								onclick={() => goto('/documents?tag=' + encodeURIComponent(tag.name))}
							>
								{#if tag.color}
									<span
										class="h-1.5 w-1.5 rounded-full"
										style="background-color: {safeTagColor(tag.color)};"
									></span>
								{/if}
								{tag.name}
							</button>
						{/each}
					</div>
				{/if}

				<!-- Mobile-only metadata -->
				<div class="mt-3 grid grid-cols-2 gap-x-4 gap-y-1 font-sans text-xs text-ink-2 sm:hidden">
					<div>
						<DocumentDate
							iso={doc.documentDate}
							precision={doc.metaDatePrecision}
							end={doc.metaDateEnd}
						/>
					</div>
					<div class="flex items-start gap-2">
						<ProgressRing percentage={item.completionPercentage} />
						<div class="flex h-9 items-center">
							<ContributorStack contributors={item.contributors} hasMore={hasMore} />
						</div>
					</div>
				</div>
			</div>

			<!-- Right column — desktop only -->
			<div class="hidden flex-col gap-2 pl-4 font-sans text-sm text-ink-2 sm:flex sm:w-44 lg:w-56">
				<div>
					<!-- An undated document is an absence, not an error (#668): DocumentDate
					     defensively maps a null date to the "Datum unbekannt" badge, so we
					     always render it — never a bare em-dash fallback. -->
					<DocumentDate
						iso={doc.documentDate}
						precision={doc.metaDatePrecision}
						end={doc.metaDateEnd}
					/>
				</div>
				<div>
					<span class="font-bold tracking-wide text-ink-3 uppercase">{m.docs_list_from()}</span>
					<span class="ml-1">
						{#if doc.sender}
							{#if senderMatched}
								<mark
									class="bg-transparent text-inherit underline decoration-brand-navy decoration-2 underline-offset-2"
									>{doc.sender.displayName}</mark
								>
							{:else}
								{doc.sender.displayName}
							{/if}
						{:else}
							<span class="text-ink-3 italic">{m.docs_list_unknown()}</span>
						{/if}
					</span>
				</div>
				<div>
					<span class="font-bold tracking-wide text-ink-3 uppercase">{m.docs_list_to()}</span>
					<span class="ml-1">
						{#if doc.receivers && doc.receivers.length > 0}
							{#each doc.receivers as receiver, i (receiver.id)}
								{#if i > 0}<span>, </span>{/if}
								{#if matchedReceiverIds.has(receiver.id)}
									<mark
										class="bg-transparent text-inherit underline decoration-brand-navy decoration-2 underline-offset-2"
										>{receiver.displayName}</mark
									>
								{:else}
									{receiver.displayName}
								{/if}
							{/each}
						{:else}
							<span class="text-ink-3 italic">{m.docs_list_unknown()}</span>
						{/if}
					</span>
				</div>
				<div class="flex items-start gap-2">
					<ProgressRing percentage={item.completionPercentage} />
					<div class="flex h-9 items-center">
						<ContributorStack contributors={item.contributors} hasMore={hasMore} />
					</div>
				</div>
			</div>
		</div>
	</div>
</li>
