<script lang="ts">
	import Modal from '$lib/components/common/Modal.svelte';
	import { getContext } from 'svelte';
	import { getModelChats, getModelOverview } from '$lib/apis/analytics';
	import ModelActivityChart from '$lib/components/admin/Evaluations/ModelActivityChart.svelte';
	import ChatList from '$lib/components/common/ChatList.svelte';
	import XMark from '$lib/components/icons/XMark.svelte';
	import Tooltip from '$lib/components/common/Tooltip.svelte';
	import { config } from '$lib/stores';

	export let show = false;
	export let model: { id: string; name: string } | null = null;
	export let startDate: number | null = null;
	export let endDate: number | null = null;
	export let onClose: () => void = () => {};

	const i18n = getContext('i18n');

	type Tab = 'overview' | 'chats';
	let selectedTab: Tab = 'overview';

	// Overview tab state
	type TimeRange = '30d' | '1y' | 'all';
	const TIME_RANGES: { key: TimeRange; label: string; days: number }[] = [
		{ key: '30d', label: '30D', days: 30 },
		{ key: '1y', label: '1Y', days: 365 },
		{ key: 'all', label: 'All', days: 0 }
	];
	let selectedRange: TimeRange = '30d';
	let history: Array<{ date: string; won: number; lost: number }> = [];
	let tags: Array<{ tag: string; count: number }> = [];
	let loadingOverview = false;

	// Chats tab state
	let chatList: Array<{
		id: string;
		title: string;
		updated_at: number;
		user_id?: string;
		user_name?: string;
	}> = [];
	let chatListLoading = false;
	let allChatsLoaded = false;
	const PAGE_SIZE = 50;

	const close = () => {
		show = false;
		selectedTab = 'overview';
		chatList = [];
		allChatsLoaded = false;
		history = [];
		tags = [];
		onClose();
	};

	const loadOverview = async (days: number) => {
		if (!model?.id) return;
		loadingOverview = true;
		try {
			const result = await getModelOverview(localStorage.token, model.id, days);
			history = result?.history ?? [];
			tags = result?.tags ?? [];
		} catch (err) {
			console.error('Failed to load overview:', err);
			history = [];
			tags = [];
		}
		loadingOverview = false;
	};

	const selectRange = (range: TimeRange) => {
		selectedRange = range;
		const config = TIME_RANGES.find((r) => r.key === range);
		if (config) {
			loadOverview(config.days);
		}
	};

	const loadChats = async () => {
		if (!model?.id) return;
		chatListLoading = true;
		chatList = [];
		allChatsLoaded = false;
		try {
			const res = await getModelChats(
				localStorage.token,
				model.id,
				startDate,
				endDate,
				0,
				PAGE_SIZE
			);
			const chats = res?.chats ?? [];
			chatList = chats.map((c: any) => ({
				id: c.chat_id,
				title: c.first_message || 'No preview',
				updated_at: c.updated_at,
				user_id: c.user_id,
				user_name: c.user_name
			}));
			allChatsLoaded = chats.length < PAGE_SIZE;
		} catch (err) {
			console.error('Failed to load chats:', err);
			chatList = [];
			allChatsLoaded = true;
		}
		chatListLoading = false;
	};

	const loadMoreChats = async () => {
		if (!model?.id || chatListLoading || allChatsLoaded) return;
		chatListLoading = true;
		try {
			const skip = chatList.length;
			const res = await getModelChats(
				localStorage.token,
				model.id,
				startDate,
				endDate,
				skip,
				PAGE_SIZE
			);
			const chats = res?.chats ?? [];
			const newChats = chats.map((c: any) => ({
				id: c.chat_id,
				title: c.first_message || 'No preview',
				updated_at: c.updated_at,
				user_id: c.user_id,
				user_name: c.user_name
			}));
			const existingIds = new Set(chatList.map((c) => c.id));
			const uniqueNewChats = newChats.filter((c) => !existingIds.has(c.id));
			chatList = [...chatList, ...uniqueNewChats];
			allChatsLoaded = chats.length < PAGE_SIZE;
		} catch (err) {
			console.error('Failed to load more chats:', err);
		}
		chatListLoading = false;
	};

	const selectTab = (tab: Tab) => {
		selectedTab = tab;
		if (tab === 'chats' && chatList.length === 0) {
			loadChats();
		}
	};

	// Load overview when modal opens
	$: if (show && model?.id) {
		selectedTab = 'overview';
		chatList = [];
		allChatsLoaded = false;
		selectRange(selectedRange);
	}
</script>

<Modal size="md" bind:show>
	{#if model}
		<div class="flex justify-between dark:text-gray-300 px-5 pt-4 pb-2">
			<Tooltip content={`${model.name} (${model.id})`} placement="top-start">
				<div class="text-lg font-medium self-center line-clamp-1">
					{model.name}
				</div>
			</Tooltip>
			<button class="self-center" on:click={close} aria-label="Close">
				<XMark className={'size-5'} />
			</button>
		</div>

		<!-- Tabs -->
		<div class="px-5 border-b border-gray-100 dark:border-gray-850">
			<div class="flex gap-4">
				<button
					class="py-2 text-sm font-medium border-b-2 transition-colors {selectedTab === 'overview'
						? 'border-black dark:border-white text-gray-900 dark:text-white'
						: 'border-transparent text-gray-500 hover:text-gray-700 dark:hover:text-gray-300'}"
					on:click={() => selectTab('overview')}
				>
					{$i18n.t('Overview')}
				</button>
				{#if $config?.features?.enable_admin_chat_access}
					<button
						class="py-2 text-sm font-medium border-b-2 transition-colors {selectedTab === 'chats'
							? 'border-black dark:border-white text-gray-900 dark:text-white'
							: 'border-transparent text-gray-500 hover:text-gray-700 dark:hover:text-gray-300'}"
						on:click={() => selectTab('chats')}
					>
						{$i18n.t('Chats')}
					</button>
				{/if}
			</div>
		</div>

		<div class="px-5 pb-4 dark:text-gray-200">
			{#if selectedTab === 'overview'}
				<!-- Activity Chart -->
				<div class="mb-4 mt-3">
					<div class="flex items-center justify-between mb-2">
						<Tooltip content={$i18n.t('Thumbs up/down ratings from users on model responses')}>
							<div class="text-xs text-gray-500 font-medium uppercase tracking-wide cursor-help">
								{$i18n.t('Feedback Activity')}
							</div>
						</Tooltip>
						<div
							class="inline-flex rounded-full bg-gray-100/80 p-0.5 dark:bg-gray-800/80 backdrop-blur-sm"
						>
							{#each TIME_RANGES as range}
								<button
									type="button"
									class="rounded-full transition-all duration-200 px-2.5 py-0.5 text-xs font-medium {selectedRange ===
									range.key
										? 'bg-white text-gray-900 shadow-sm dark:bg-gray-700 dark:text-white'
										: 'text-gray-500 hover:text-gray-700 dark:text-gray-400 dark:hover:text-gray-200'}"
									on:click={() => selectRange(range.key)}
								>
									{range.label}
								</button>
							{/each}
						</div>
					</div>
					<ModelActivityChart
						{history}
						loading={loadingOverview}
						aggregateWeekly={selectedRange === '1y' || selectedRange === 'all'}
					/>
				</div>

				<!-- Tags -->
				<div class="mb-4">
					<div class="text-xs text-gray-500 mb-2 font-medium uppercase tracking-wide">
						{$i18n.t('Tags')}
					</div>
					{#if tags.length}
						<div class="flex flex-wrap gap-1 -mx-1">
							{#each tags as tagInfo}
								<span class="px-2 py-0.5 rounded-full bg-gray-100 dark:bg-gray-850 text-xs">
									{tagInfo.tag} <span class="text-gray-500 font-medium">{tagInfo.count}</span>
								</span>
							{/each}
						</div>
					{:else}
						<span class="text-gray-500 text-sm">-</span>
					{/if}
				</div>
			{:else if selectedTab === 'chats'}
				<div class="mt-3">
					<ChatList
						{chatList}
						loading={chatListLoading}
						allLoaded={allChatsLoaded}
						showUserInfo={true}
						shareUrl={true}
						onLoadMore={loadMoreChats}
						onChatClick={() => (show = false)}
					/>
				</div>
			{/if}

			<div class="flex justify-end pt-4">
				<button
					class="px-3.5 py-1.5 text-sm font-medium bg-black hover:bg-gray-900 text-white dark:bg-white dark:text-black dark:hover:bg-gray-100 transition rounded-full"
					type="button"
					on:click={close}
				>
					{$i18n.t('Close')}
				</button>
			</div>
		</div>
	{/if}
</Modal>
