import { useEffect, useRef } from 'react';
import { settingsStore } from '@/lib/store/settings-store';
import { fetchSourcesFromUrl, mergeSources } from '@/lib/utils/source-import-utils';

export function useSubscriptionSync() {
    const hasSyncedRef = useRef(false);

    useEffect(() => {
        if (hasSyncedRef.current) return;
        hasSyncedRef.current = true;

        const sync = async () => {
            const settings = settingsStore.getSettings();
            const subscriptions = settings.subscriptions.filter(s => s.autoRefresh !== false);

            if (subscriptions.length === 0) return;

            let anyChanged = false;
            let currentSources = [...settings.sources];
            let currentAdultSources = [...settings.adultSources];
            let updatedSubscriptions = [...settings.subscriptions];

            for (let i = 0; i < subscriptions.length; i++) {
                const sub = subscriptions[i];
                try {
                    const result = await fetchSourcesFromUrl(sub.url);

                    if (result.normalSources.length > 0) {
                        currentSources = mergeSources(currentSources, result.normalSources);
                        anyChanged = true;
                    }

                    if (result.adultSources.length > 0) {
                        currentAdultSources = mergeSources(currentAdultSources, result.adultSources);
                        anyChanged = true;
                    }

                    // Update timestamp
                    const subIdx = updatedSubscriptions.findIndex(s => s.id === sub.id);
                    if (subIdx !== -1) {
                        updatedSubscriptions[subIdx] = {
                            ...updatedSubscriptions[subIdx],
                            lastUpdated: Date.now()
                        };
                    }
                } catch (e) {
                    console.error(`Failed to sync subscription: ${sub.name}`, e);
                }
            }

            if (anyChanged) {
                settingsStore.saveSettings({
                    ...settings,
                    sources: currentSources,
                    adultSources: currentAdultSources,
                    subscriptions: updatedSubscriptions
                });
            }
        };

        sync();
    }, []);
}