<script lang="ts">
	import { character, charaNames, type Character } from '$lib/data/character';
	import { byChara, locations, groupPopulars, conversation, type Conversation, requiredCharas } from '$lib/data/convo';
	import CharaPick from '$lib/CharaPick.svelte';
	import { onMount } from 'svelte';

	let conversations: Conversation[] = $state([]);
	const convoMap = $derived(byChara(conversations));
	const popular = $derived(groupPopulars(conversations));
	let characters: Character[] = $state([]);
	const selCharas = $derived(characters.filter((c) => convoMap.has(c.chara_id)));
	const names = $derived(charaNames(characters ?? []));
	const minSuggest = 8;

	onMount(async () => {
		[conversations, characters] = await Promise.all([conversation(), character()]);
	});

	let chara: Character | undefined = $state();
	let convo = $state(1);

	const options = $derived(convoMap.get(chara?.chara_id ?? 0) ?? []);
	const cur = $derived(options.find((c) => c.number === convo));
	const cur1Name = $derived(cur?.chara_1 && names.get(cur.chara_1)?.en);
	const cur2Name = $derived(cur?.chara_2 && names.get(cur.chara_2)?.en);
	const cur3Name = $derived(cur?.chara_3 && names.get(cur.chara_3)?.en);
	const suggested = $derived.by(() => {
		if (cur == null) {
			return [];
		}
		const u = popular[locations[cur.location].group].filter(
			(s) => names.get(s[0]) != null && s[0] !== cur.chara_1 && s[0] !== cur.chara_2 && s[0] !== cur.chara_3,
		);
		const r = u.length <= minSuggest ? u : u.filter((s) => s[1] >= u[minSuggest][1]);
		return r.map(([chara_id, count]) => ({ chara_id, chara_name: names.get(chara_id), count }));
	});
	const curLoc = $derived(cur != null ? locations[cur.location] : null);
	const req = $derived(cur != null ? requiredCharas(cur) : []);
</script>

<h1 class="text-4xl">Lobby Conversations</h1>
<div class="mx-auto mt-8 flex flex-col rounded-md text-center shadow-md ring md:max-w-xl md:flex-row">
	<div class="m-4 flex-1 md:mt-3">
		<label for="chara" class="hidden md:inline">Character</label>
		<CharaPick id="chara" characters={selCharas} class="w-full" bind:value={chara} required />
	</div>
	<div class="m-4 flex-1 md:mt-3">
		<label for="convo" class="hidden md:inline">Conversation</label>
		<select id="convo" bind:value={convo} class="w-full">
			{#each options as opt (opt.number)}
				<option value={opt.number}>Slice of Life {opt.number}</option>
			{/each}
		</select>
	</div>
</div>
{#if cur}
	<div class="shadow-sm transition-shadow hover:shadow-md">
		<div class="mt-8 flex text-center text-lg">
			<span class={{ 'flex-1': true, 'font-bold italic': req.includes(cur.chara_1) }}>{cur1Name}</span>
			{#if cur2Name}
				<span class={{ 'flex-1': true, 'font-bold italic': cur.chara_2 != null && req.includes(cur.chara_2) }}>{cur2Name}</span>
			{/if}
			{#if cur3Name}
				<span class={{ 'flex-1': true, 'font-bold italic': cur.chara_3 != null && req.includes(cur.chara_3) }}>{cur3Name}</span>
			{/if}
		</div>
		<div class="flex w-full text-center text-lg">
			<span class="flex-1">at {curLoc?.name.en}</span>
		</div>
		{#if req.length > 0}
			<div class="mt-2 flex w-full text-center text-sm italic">
				<span class="flex-1">
					The conversation will not appear unless you own a trainee or support card of all characters with names in italics.
				</span>
			</div>
		{/if}
	</div>
	<div class="mt-4 block text-center">
		<span>Other characters who appear here most often:</span>
	</div>
	<div class="mt-4 grid text-center shadow-sm transition-shadow ease-in hover:shadow-md hover:ease-out md:grid-cols-4">
		{#each suggested as s (s.chara_id)}
			<span>{s.chara_name?.en}: {s.count}&#xd7;</span>
		{/each}
	</div>
	<div class="mt-4 block text-center">
		<span>
			Set these characters to fixed positions (main, upgrades, story, races) to maximize the chance of getting this conversation.
		</span>
	</div>
{/if}
