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<script lang="ts">
	import { getContext, onMount } from 'svelte';
	const i18n = getContext('i18n');

	import dayjs from 'dayjs';
	import localizedFormat from 'dayjs/plugin/localizedFormat';
	import { getTimeRange } from '$lib/utils';
	import ChevronUp from '$lib/components/icons/ChevronUp.svelte';
	import ChevronDown from '$lib/components/icons/ChevronDown.svelte';
	import Loader from '$lib/components/common/Loader.svelte';
	import Spinner from '$lib/components/common/Spinner.svelte';

	dayjs.extend(localizedFormat);

	export let chats = [];

	export let chatListLoading = false;
	export let allChatsLoaded = false;

	export let loadHandler: Function = null;

	let chatList = null;

	const init = async () => {
		if (chats.length === 0) {
			chatList = [];
		} else {
			chatList = chats.map((chat) => ({
				...chat,
				time_range: getTimeRange(chat.updated_at)
			}));

			chatList.sort((a, b) => {
				if (direction === 'asc') {
					return a[orderBy] > b[orderBy] ? 1 : -1;
				} else {
					return a[orderBy] < b[orderBy] ? 1 : -1;
				}
			});
		}
	};

	const setSortKey = (key) => {
		if (orderBy === key) {
			direction = direction === 'asc' ? 'desc' : 'asc';
		} else {
			orderBy = key;
			direction = 'asc';
		}

		init();
	};

	let orderBy = 'updated_at';
	let direction = 'desc'; // 'asc' or 'desc'

	$: if (chats) {
		init();
	}
</script>

{#if chatList}
	{#if chatList.length > 0}
		<div class="flex text-xs font-medium mb-1 items-center -mr-0.5">
			<button
				class="px-1.5 py-1 cursor-pointer select-none basis-3/5"
				on:click={() => setSortKey('title')}
			>
				<div class="flex gap-1.5 items-center">
					{$i18n.t('Title')}

					{#if orderBy === 'title'}
						<span class="font-normal"
							>{#if direction === 'asc'}
								<ChevronUp className="size-2" />
							{:else}
								<ChevronDown className="size-2" />
							{/if}
						</span>
					{:else}
						<span class="invisible">
							<ChevronUp className="size-2" />
						</span>
					{/if}
				</div>
			</button>
			<button
				class="px-1.5 py-1 cursor-pointer select-none hidden sm:flex sm:basis-2/5 justify-end"
				on:click={() => setSortKey('updated_at')}
			>
				<div class="flex gap-1.5 items-center">
					{$i18n.t('Updated at')}

					{#if orderBy === 'updated_at'}
						<span class="font-normal"
							>{#if direction === 'asc'}
								<ChevronUp className="size-2" />
							{:else}
								<ChevronDown className="size-2" />
							{/if}
						</span>
					{:else}
						<span class="invisible">
							<ChevronUp className="size-2" />
						</span>
					{/if}
				</div>
			</button>
		</div>
	{/if}

	<div class="text-left text-sm w-full mb-3">
		{#if chatList.length === 0}
			<div
				class="text-xs text-gray-500 dark:text-gray-400 text-center px-5 min-h-20 w-full h-full flex justify-center items-center"
			>
				{$i18n.t('No chats found')}
			</div>
		{/if}

		{#each chatList as chat, idx (chat.id)}
			{#if (idx === 0 || (idx > 0 && chat.time_range !== chatList[idx - 1].time_range)) && chat?.time_range}
				<div
					class="w-full text-xs text-gray-500 dark:text-gray-500 font-medium {idx === 0
						? ''
						: 'pt-5'} pb-2 px-2"
				>
					{$i18n.t(chat.time_range)}
					<!-- localisation keys for time_range to be recognized from the i18next parser (so they don't get automatically removed):
							{$i18n.t('Today')}
							{$i18n.t('Yesterday')}
							{$i18n.t('Previous 7 days')}
							{$i18n.t('Previous 30 days')}
							{$i18n.t('January')}
							{$i18n.t('February')}
							{$i18n.t('March')}
							{$i18n.t('April')}
							{$i18n.t('May')}
							{$i18n.t('June')}
							{$i18n.t('July')}
							{$i18n.t('August')}
							{$i18n.t('September')}
							{$i18n.t('October')}
							{$i18n.t('November')}
							{$i18n.t('December')}
							-->
				</div>
			{/if}

			<a
				class=" w-full flex justify-between items-center rounded-lg text-sm py-2 px-3 hover:bg-gray-50 dark:hover:bg-gray-850"
				draggable="false"
				href={`/c/${chat.id}`}
				on:click={() => (show = false)}
			>
				<div class="text-ellipsis line-clamp-1 w-full sm:basis-3/5">
					{chat?.title}
				</div>

				<div class="hidden sm:flex sm:basis-2/5 items-center justify-end">
					<div class=" text-gray-500 dark:text-gray-400 text-xs">
						{dayjs(chat?.updated_at * 1000).calendar()}
					</div>
				</div>
			</a>
		{/each}

		{#if !allChatsLoaded && loadHandler}
			<Loader
				on:visible={(e) => {
					if (!chatListLoading) {
						loadHandler();
					}
				}}
			>
				<div class="w-full flex justify-center py-1 text-xs animate-pulse items-center gap-2">
					<Spinner className=" size-4" />
					<div class=" ">Loading...</div>
				</div>
			</Loader>
		{/if}
	</div>
{/if}