import { useEffect, useState } from "react";

export interface BeforeInstallPromptEvent extends Event {
    prompt(): Promise<void>;
    userChoice: Promise<{ outcome: "accepted" | "dismissed" }>;
}

const DISMISSED_KEY = "pwa-dismissed";

export function usePwaInstall() {
    const [promptEvent, setPromptEvent] =
        useState<BeforeInstallPromptEvent | null>(null);
    const [isInstalled, setIsInstalled] = useState(false);
    const [isDismissed, setIsDismissed] = useState(
        () => !!localStorage.getItem(DISMISSED_KEY),
    );

    useEffect(() => {
        if (window.matchMedia("(display-mode: standalone)").matches) {
            setIsInstalled(true);
            return;
        }

        const handleBeforeInstallPrompt = (e: Event) => {
            e.preventDefault();
            setPromptEvent(e as BeforeInstallPromptEvent);
        };

        const handleAppInstalled = () => {
            setIsInstalled(true);
            setPromptEvent(null);
        };

        window.addEventListener(
            "beforeinstallprompt",
            handleBeforeInstallPrompt,
        );
        window.addEventListener("appinstalled", handleAppInstalled);

        return () => {
            window.removeEventListener(
                "beforeinstallprompt",
                handleBeforeInstallPrompt,
            );
            window.removeEventListener("appinstalled", handleAppInstalled);
        };
    }, []);

    const install = async (): Promise<boolean> => {
        if (!promptEvent) return false;

        try {
            await promptEvent.prompt();
            const { outcome } = await promptEvent.userChoice;
            return outcome === "accepted";
        } finally {
            setPromptEvent(null);
        }
    };

    const dismiss = () => {
        localStorage.setItem(DISMISSED_KEY, "1");
        setIsDismissed(true);
    };

    return { promptEvent, isInstalled, isDismissed, install, dismiss };
}