/**
 * Frontend functionality for subscribers and tags.
 *
 * @since   1.9.6
 *
 * @package ConvertKit
 * @author ConvertKit
 */

/**
 * Gets the subscriber ID for the given email address, storing
 * it in the `ck_subscriber_id` cookie if it exists.
 *
 * Typically called when the user completes a ConvertKit Form
 * that has either "Auto-confirm new subscribers" or
 * "Send subscriber to thank you page" enabled (both scenarios
 * include a ck_subscriber_id).
 *
 * @since   1.9.6
 *
 * @param   string  emailAddress   Email Address
 */
function convertStoreSubscriberEmailAsIDInCookie( emailAddress ) {

	if ( convertkit.debug ) {
		console.log( 'convertStoreSubscriberEmailAsIDInCookie' );
		console.log( emailAddress );
	}

	fetch(
		convertkit.ajaxurl,
		{
			method: 'POST',
			headers: {
				'Content-Type': 'application/x-www-form-urlencoded',
			},
			body: new URLSearchParams(
				{
					action: 'convertkit_store_subscriber_email_as_id_in_cookie',
					convertkit_nonce: convertkit.nonce,
					email: emailAddress
				}
			)
		}
	)
	.then(
		function ( response ) {
			if ( convertkit.debug ) {
				console.log( response );
			}

			return response.json();
		}
	)
	.then(
		function ( result ) {
			if ( convertkit.debug ) {
				console.log( result );
			}

			// Emit custom event with subscriber ID.
			convertKitEmitCustomEvent(
				'convertkit_user_subscribed',
				{
					id: result.data.id,
					email: emailAddress
				}
			);
		}
	)
	.catch(
		function ( error ) {
			if ( convertkit.debug ) {
				console.error( error );
			}
		}
	);

}

/**
 * Remove the url subscriber_id url param
 *
 * The 'ck_subscriber_id' should only be set on URLs included on
 * links from a ConvertKit email with no other URL parameters.
 * This function removes the parameters so a customer won't share
 * a URL with their subscriber ID in it.
 *
 * @param url
 */
function convertKitRemoveSubscriberIDFromURL( url ) {

	// Parse URL.
	const url_object       = new URL( url );
	const ck_subscriber_id = url_object.searchParams.get( 'ck_subscriber_id' );

	// If ck_subscriber_id is null, it's not included in the URL.
	// Don't modify the URL.
	if ( ck_subscriber_id === null ) {
		return;
	}

	// Remove ck_subscriber_id from URL params.
	url_object.searchParams.delete( 'ck_subscriber_id' );

	// Get title and string of parameters.
	const title = document.getElementsByTagName( 'title' )[0].innerHTML;
	let params  = url_object.searchParams.toString();

	// Only add '?' if there are parameters.
	if ( params.length > 0 ) {
		params = '?' + params;
	}

	// Update history.
	window.history.replaceState( null, title, url_object.pathname + params + url_object.hash );

}

/**
 * Utility function to pause for the given number of milliseconds
 *
 * @since   1.9.6
 *
 * @param   int     milliseconds
 */
function convertKitSleep( milliseconds ) {

	var start = new Date().getTime();
	for (var i = 0; i < 1e7; i++) {
		if ((new Date().getTime() - start) > milliseconds) {
			break;
		}
	}

}

/**
 * Emit a custom event with optional detail data.
 *
 * This function creates and dispatches a custom event with the specified
 * event name and detail data.
 *
 * @since 2.5.0
 *
 * @param {string} eventName	The name of the custom event to emit.
 * @param {Object} [detail={}] 	Optional detail data to include with the event.
 */
function convertKitEmitCustomEvent( eventName, detail ) {

	const event = new CustomEvent( eventName, { detail } );
	document.dispatchEvent( event );

}

/**
 * Register events
 */
document.addEventListener(
	'DOMContentLoaded',
	function () {

		// Removes `ck_subscriber_id` from the URI.
		convertKitRemoveSubscriberIDFromURL( window.location.href );

		// Store subscriber ID as a cookie from the email address used when a ConvertKit Form is submitted.
		document.addEventListener(
			'click',
			function (e) {
				// Check if the form submit button was clicked, or the span element was clicked and its parent is the form submit button.
				if ( ! e.target.matches( '.formkit-submit' ) && ( ! e.target.parentElement || ! e.target.parentElement.matches( '.formkit-submit' ) ) ) {
					if ( convertkit.debug ) {
						console.log( 'not a ck form' );
					}

					return;
				}

				// Get email address.
				let emailAddress = document.querySelector( 'input[name="email_address"]' ).value;

				// If the email address is empty, don't attempt to get the subscriber ID by email.
				if ( ! emailAddress.length ) {
					if ( convertkit.debug ) {
						console.log( 'email empty' );
					}

					return;
				}

				// If the email address is invalid, don't attempt to get the subscriber ID by email.
				var validator = /^(([^<>()\[\]\\.,;:\s@"]+(\.[^<>()\[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
				if ( ! validator.test( emailAddress.toLowerCase() ) ) {
					if ( convertkit.debug ) {
						console.log( 'email not an email address' );
					}

					return;
				}

				// Wait a moment before sending the AJAX request.
				convertKitSleep( 2000 );
				convertStoreSubscriberEmailAsIDInCookie( emailAddress );
			}
		);

	}
);