/**
 * Content Blocker – frontend.js
 * Click-to-load: the real iframe is CREATED only after the user actively
 * consents per service. Consent is stored in localStorage per service id.
 */

( function () {
	'use strict';

	const STORAGE_PREFIX = 'cb_consent_';

	/* ───────────────────────── consent storage ───────────────────────── */

	function hasConsent( serviceId ) {
		try {
			return localStorage.getItem( STORAGE_PREFIX + serviceId ) === '1';
		} catch ( e ) {
			return false;
		}
	}

	function grantConsent( serviceId ) {
		try {
			localStorage.setItem( STORAGE_PREFIX + serviceId, '1' );
		} catch ( e ) {
			// localStorage unavailable; allow the load for this session only.
		}
	}

	/* ───────────────────────── iframe loading ────────────────────────── */

	/** Replace a .cb-blocker element with the real iframe. src comes from data-src. */
	function loadContent( blockerEl ) {
		const src = blockerEl.dataset.src;
		if ( ! src ) {
			blockerEl.remove();
			return;
		}

		const iframe = document.createElement( 'iframe' );

		if ( blockerEl.dataset.width )  iframe.width  = blockerEl.dataset.width;
		if ( blockerEl.dataset.height ) iframe.height = blockerEl.dataset.height;

		iframe.setAttribute( 'loading', 'lazy' );
		iframe.setAttribute( 'allowfullscreen', '' );
		iframe.setAttribute( 'referrerpolicy', 'no-referrer-when-downgrade' );

		// Set src last — this is the moment the network request is made.
		iframe.src = src;

		blockerEl.parentNode.replaceChild( iframe, blockerEl );
	}

	function loadPreConsented() {
		document.querySelectorAll( '.cb-blocker[data-cb-id]' ).forEach( function ( el ) {
			const id = el.dataset.cbId;
			if ( id && hasConsent( id ) ) {
				loadContent( el );
			}
		} );
	}

	/* ───────────────────────── consent buttons ───────────────────────── */

	function attachButtons() {
		document.addEventListener( 'click', function ( e ) {
			const btn = e.target.closest( '.cb-blocker__button' );
			if ( ! btn ) return;

			const serviceId = btn.dataset.cbId;
			if ( ! serviceId ) return;

			grantConsent( serviceId );

			const wrapper = btn.closest( '.cb-blocker' );
			if ( wrapper ) {
				loadContent( wrapper );
			}
		} );
	}

	/* ───────────────────────── revoke (Art. 7 (3)) ───────────────────── */

	window.cbRevokeAll = function () {
		try {
			const keysToRemove = [];
			for ( let i = 0; i < localStorage.length; i++ ) {
				const key = localStorage.key( i );
				if ( key && key.indexOf( STORAGE_PREFIX ) === 0 ) {
					keysToRemove.push( key );
				}
			}
			keysToRemove.forEach( function ( k ) {
				localStorage.removeItem( k );
			} );
		} catch ( e ) {
			// Silently ignore if localStorage is unavailable.
		}
		window.location.reload();
	};

	/* ───────────────────────── bootstrap ─────────────────────────────── */

	function init() {
		loadPreConsented();
		attachButtons();
	}

	if ( document.readyState === 'loading' ) {
		document.addEventListener( 'DOMContentLoaded', init );
	} else {
		init();
	}
} )();