<script lang="ts">
import { m } from '$lib/paraglide/messages.js';
import { SvelteMap } from 'svelte/reactivity';
import BackButton from '$lib/components/BackButton.svelte';
import PersonCard from './PersonCard.svelte';
import NameHistoryCard from './NameHistoryCard.svelte';
import CoCorrespondentsList from './CoCorrespondentsList.svelte';
import PersonDocumentList from './PersonDocumentList.svelte';
import PersonRelationshipsCard from './PersonRelationshipsCard.svelte';

let { data } = $props();

const person = $derived(data.person);
const sentDocuments = $derived(data.sentDocuments);
const receivedDocuments = $derived(data.receivedDocuments);

const coCorrespondents = $derived.by(() => {
	const freq = new SvelteMap<string, { id: string; name: string; count: number }>();

	for (const doc of sentDocuments) {
		for (const receiver of doc.receivers ?? []) {
			const key = receiver.id;
			const existing = freq.get(key);
			if (existing) existing.count++;
			else
				freq.set(key, {
					id: receiver.id,
					name: receiver.displayName,
					count: 1
				});
		}
	}

	for (const doc of receivedDocuments) {
		if (doc.sender && doc.sender.id !== person.id) {
			const key = doc.sender.id;
			const existing = freq.get(key);
			if (existing) existing.count++;
			else
				freq.set(key, {
					id: doc.sender.id,
					name: doc.sender.displayName,
					count: 1
				});
		}
	}

	return [...freq.values()].sort((a, b) => b.count - a.count).slice(0, 5);
});
</script>

<div class="mx-auto max-w-6xl px-4 py-10">
	<!-- Back Link -->
	<div class="mb-6">
		<BackButton />
	</div>

	<!-- 2-column layout on large screens -->
	<div class="lg:grid lg:grid-cols-[35%_65%] lg:gap-8">
		<!-- Left column: Person card + name history -->
		<div>
			<PersonCard person={person} canWrite={data.canWrite} />
			<div class="mt-6">
				<NameHistoryCard aliases={data.aliases} personFirstName={person.firstName} />
			</div>
		</div>

		<!-- Right column: correspondents + relationships + documents -->
		<div>
			<CoCorrespondentsList coCorrespondents={coCorrespondents} personId={person.id} />

			<div class="mt-6">
				<PersonRelationshipsCard
					personId={person.id}
					relationships={data.relationships}
					inferredRelationships={data.inferredRelationships}
				/>
			</div>

			<div class="mt-6">
				<PersonDocumentList
					documents={sentDocuments}
					heading={m.person_docs_heading()}
					emptyMessage={m.person_no_docs()}
				/>
			</div>

			<div class="mt-6">
				<PersonDocumentList
					documents={receivedDocuments}
					heading={m.person_received_docs_heading()}
					emptyMessage={m.person_no_received_docs()}
				/>
			</div>
		</div>
	</div>
</div>
