import { useMemo } from "react";
import { useParams, useNavigate } from "react-router-dom";
import { Settings as SettingsIcon } from "lucide-react";
import { Alert, AlertDescription } from "@/components/ui/alert";
import { Badge } from "@/components/ui/badge";
import { Button } from "@/components/ui/button";
import { Tabs, TabsContent, TabsList, TabsTrigger } from "@/components/ui/tabs";
import { useServiceInstances } from "../hooks/useServices";
import type { ServiceInstance } from "../types";
import { SectionCard } from "../components/SectionCard";
import { getServiceBinding } from "../integrations/registry";
import {
	OVERVIEW_TAB,
	serviceContentTabs,
	type ContentTab,
} from "./service-tabs";

export function ServicePage() {
	const { serviceType = "", serviceId = "" } = useParams<{
		serviceType: string;
		serviceId: string;
	}>();
	const { data: services = [] } = useServiceInstances(serviceType || undefined);
	const navigate = useNavigate();

	const instance = useMemo(
		() => services.find((s) => s.id === serviceId),
		[services, serviceId],
	);
	const binding = getServiceBinding(serviceType);
	const contentTabs = useMemo(
		() => serviceContentTabs(serviceType),
		[serviceType],
	);
	const siblings = useMemo(
		() => services.filter((s) => s.service_type === serviceType && s.enabled),
		[services, serviceType],
	);
	const showInstanceTabs = siblings.length > 1;

	const allTabs: ContentTab[] = [OVERVIEW_TAB, ...contentTabs];

	if (!binding) {
		return (
			<Alert>
				<AlertDescription>Unknown service type: {serviceType}</AlertDescription>
			</Alert>
		);
	}

	if (!instance) {
		return (
			<Alert>
				<AlertDescription>Service not found.</AlertDescription>
			</Alert>
		);
	}

	const widgetsContent =
		binding.widgets.length > 0 ? (
			<div className="flex flex-col gap-2">
				{binding.widgets.map((w) => (
					<div
						key={w.kind}
						className="flex items-center justify-between rounded border p-2"
					>
						<div>
							<div className="font-medium">{w.name}</div>
							<div className="text-xs text-muted-foreground">
								{w.description}
							</div>
						</div>
						<Badge variant="outline">{w.kind}</Badge>
					</div>
				))}
				<p className="text-xs text-muted-foreground">
					Add these to the dashboard from the dashboard's edit dialog.
				</p>
			</div>
		) : (
			<p className="text-sm text-muted-foreground">
				No widget kinds for this service type.
			</p>
		);

	return (
		<div className="flex flex-col gap-4">
			{/* Header */}
			<div className="flex items-center justify-between gap-4">
				<div className="min-w-0">
					<h2 className="text-xl font-semibold">{instance.name}</h2>
					<p className="text-sm text-muted-foreground">{binding.description}</p>
				</div>
				<div className="flex items-center gap-2">
					<Badge variant="outline">{binding.name}</Badge>
					<Button
						variant="outline"
						size="sm"
						onClick={() =>
							navigate(
								`/settings?tab=services&service=${encodeURIComponent(instance.id)}`,
							)
						}
					>
						<SettingsIcon className="mr-1 h-3 w-3" />
						Settings
					</Button>
				</div>
			</div>

			{/* Instance tabs (only when >1 enabled sibling) */}
			{showInstanceTabs ? (
				<Tabs value={instance.id}>
					<TabsList>
						{siblings.map((sibling: ServiceInstance) => (
							<TabsTrigger
								key={sibling.id}
								value={sibling.id}
								onClick={() =>
									navigate(`/services/${serviceType}/${sibling.id}`)
								}
							>
								{sibling.name}
							</TabsTrigger>
						))}
					</TabsList>
				</Tabs>
			) : null}

			{/* Content tabs */}
			<Tabs defaultValue="Overview">
				<TabsList>
					<TabsTrigger value="Overview">Overview</TabsTrigger>
					{contentTabs.map((tab) => (
						<TabsTrigger key={tab.label} value={tab.label}>
							{tab.label}
						</TabsTrigger>
					))}
					<TabsTrigger value="Widgets">Widgets</TabsTrigger>
				</TabsList>

				{allTabs.map((tab) => {
					const TabComponent = tab.Component;
					return (
						<TabsContent key={tab.label} value={tab.label}>
							<TabComponent instance={instance} />
						</TabsContent>
					);
				})}

				<TabsContent value="Widgets">
					<SectionCard
						title="Widgets"
						description="Widget kinds this service provides."
					>
						{widgetsContent}
					</SectionCard>
				</TabsContent>
			</Tabs>
		</div>
	);
}