'use client';
import { useCallback, useEffect, useState } from 'react';
import { LOCALE_COOKIE_NAME } from '../i18n/index.js';
import { ACCEPT_ALL_CONSENT, DEFAULT_CONSENT, REJECT_ALL_CONSENT } from './categories.js';
import { updateConsent } from './googleConsent.js';
import { CONSENT_COOKIE, CONSENT_MAX_AGE, parseConsent, serializeConsent } from './storage.js';
/**
 * Cookies to delete when consent for a category is withdrawn. Keyed by
 * category. The plugin knows about its own functional cookie (locale); clients
 * can extend this via the `cookieMap` arg to useConsent if they set their own.
 */ const DEFAULT_COOKIE_MAP = {
    functional: [
        LOCALE_COOKIE_NAME
    ]
};
/** Expire a cookie now, across the whole site. */ function deleteCookie(name) {
    document.cookie = `${name}=;path=/;max-age=0;samesite=lax`;
}
export function useConsent(cookieMap = DEFAULT_COOKIE_MAP) {
    const [state, setState] = useState(DEFAULT_CONSENT);
    const [decided, setDecided] = useState(false);
    useEffect(()=>{
        const raw = document.cookie.split('; ').find((c)=>c.startsWith(`${CONSENT_COOKIE}=`))?.split('=')[1];
        const parsed = parseConsent(raw);
        if (parsed) {
            setState(parsed);
            setDecided(true);
        }
    }, []);
    const persist = useCallback((next)=>{
        // Withdrawal cleanup: for any category flipping true → false, delete the
        // cookies tied to it. GDPR: withdrawing consent must stop the processing,
        // so a functional cookie (e.g. locale) written under consent has to go when
        // that consent is revoked. Uses the current `state` as the previous value.
        for (const cat of Object.keys(cookieMap)){
            const wasGranted = state[cat] === true;
            const nowDenied = next[cat] !== true;
            if (wasGranted && nowDenied) {
                for (const name of cookieMap[cat] ?? []){
                    deleteCookie(name);
                }
            }
        }
        document.cookie = `${CONSENT_COOKIE}=${serializeConsent(next)};path=/;max-age=${CONSENT_MAX_AGE};samesite=lax`;
        setState(next);
        setDecided(true);
        // Tell Google right away. Tags are already on the page holding whatever
        // defaults Analytics set at load; without this update they keep them for
        // the rest of the session and never write their cookies — the banner would
        // look like it worked while nothing changed.
        updateConsent(next);
    }, [
        state,
        cookieMap
    ]);
    const acceptAll = useCallback(()=>persist(ACCEPT_ALL_CONSENT), [
        persist
    ]);
    const rejectAll = useCallback(()=>persist(REJECT_ALL_CONSENT), [
        persist
    ]);
    const savePreferences = useCallback((choices)=>persist({
            ...DEFAULT_CONSENT,
            ...choices,
            necessary: true
        }), [
        persist
    ]);
    const reopen = useCallback(()=>setDecided(false), []);
    return {
        acceptAll,
        decided,
        rejectAll,
        reopen,
        savePreferences,
        state
    };
}

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