import { useEffect, useRef, useState } from "react";
import { useEventContext } from "../../../state/events";
import {
	handleEventToast,
	mapEventToCategory,
	mapEventToSeverity,
} from "../../toast-rules";
import { getUserConfig } from "../../../api/settings";
import type { UserConfig } from "../../../api/settings";

interface ToastConfig {
	notification_toast_level: string;
	notification_mute_categories: string[];
}

export function EventToastBridge(): JSX.Element | null {
	const { events } = useEventContext();
	const processedRef = useRef<Set<string>>(new Set());
	const [config, setConfig] = useState<ToastConfig | null>(null);

	useEffect(() => {
		getUserConfig()
			.then((c) => {
				setConfig({
					notification_toast_level: c.notification_toast_level ?? "all",
					notification_mute_categories: c.notification_mute_categories ?? [],
				});
			})
			.catch(() => {
				setConfig({
					notification_toast_level: "all",
					notification_mute_categories: [],
				});
			});

		const handler = (e: Event) => {
			const detail = (e as CustomEvent<Partial<UserConfig>>).detail;
			if (detail) {
				setConfig((prev) => ({
					notification_toast_level:
						detail.notification_toast_level ??
						prev?.notification_toast_level ??
						"all",
					notification_mute_categories:
						detail.notification_mute_categories ??
						prev?.notification_mute_categories ??
						[],
				}));
			}
		};

		window.addEventListener("userconfig:updated", handler);
		return () => window.removeEventListener("userconfig:updated", handler);
	}, []);

	useEffect(() => {
		if (!config) return;

		for (const event of events) {
			const key = `${event.correlation_id}:${event.timestamp}`;
			if (processedRef.current.has(key)) continue;
			processedRef.current.add(key);

			const category = mapEventToCategory(event);
			const severity = mapEventToSeverity(event);

			if (config.notification_toast_level === "none") continue;
			if (config.notification_toast_level === "errors" && severity !== "error")
				continue;
			if (config.notification_mute_categories.includes(category)) continue;

			handleEventToast(event);
		}
	}, [events, config]);

	return null;
}
