import {useEffect, useState} from 'react';
import {check, Update} from '@tauri-apps/plugin-updater';
import {relaunch} from '@tauri-apps/plugin-process';

export interface UpdateState {
    available: boolean;
    version: string;
    notes: string;
    downloading: boolean;
    progress: number;
    install: () => Promise<void>;
    dismiss: () => void;
}

export function useAutoUpdate(): UpdateState {
    const [available, setAvailable] = useState(false);
    const [version, setVersion] = useState('');
    const [notes, setNotes] = useState('');
    const [downloading, setDownloading] = useState(false);
    const [progress, setProgress] = useState(0);
    const [update, setUpdate] = useState<Update | null>(null);

    useEffect(() => {
        let cancelled = false;

        async function checkForUpdate() {
            try {
                const result = await check();
                if (cancelled || !result) return;
                setUpdate(result);
                setAvailable(true);
                setVersion(result.version);
                setNotes(result.body ?? '');
            } catch (_) {
                // silently fail — no update or offline
            }
        }

        checkForUpdate();
        return () => { cancelled = true; };
    }, []);

    async function install() {
        if (!update) return;
        setDownloading(true);
        try {
            await update.downloadAndInstall((event) => {
                if (event.event === 'Started' && event.data.contentLength) {
                    setProgress(0);
                } else if (event.event === 'Progress') {
                    setProgress((prev) => prev + event.data.chunkLength);
                } else if (event.event === 'Finished') {
                    setProgress(100);
                }
            });
            await relaunch();
        } catch (_) {
            setDownloading(false);
        }
    }

    function dismiss() {
        setAvailable(false);
    }

    return {available, version, notes, downloading, progress, install, dismiss};
}