<?php
/**
 * Newsletter provider integration. When a participant opts in, their address is
 * pushed to the configured provider (Mailchimp, Brevo or CleverReach) via the
 * provider REST API. Double-opt-in is honoured where the provider supports it.
 */

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

class ADVK_Newsletter {

	public function hooks() {
		// Runs after an entry is stored; $extra carries the opt-in + name.
		add_action( 'advk_entry_created', array( $this, 'maybe_subscribe' ), 10, 5 );
	}

	/**
	 * @param int    $id    Entry id.
	 * @param int    $day   Door day.
	 * @param string $email Participant e-mail.
	 * @param string $losnr Lot number.
	 * @param array  $extra first, last, newsletter, reminder, ref.
	 */
	public function maybe_subscribe( $id, $day, $email, $losnr, $extra = array() ) {
		$opts = ADVK_Settings::get_options();

		if ( empty( $opts['newsletter_enabled'] ) ) {
			return;
		}
		// Only subscribe when the participant actively opted in.
		if ( empty( $extra['newsletter'] ) ) {
			return;
		}

		$provider = isset( $opts['newsletter_provider'] ) ? $opts['newsletter_provider'] : 'none';
		$api_key  = isset( $opts['newsletter_api_key'] ) ? trim( (string) $opts['newsletter_api_key'] ) : '';
		$list_id  = isset( $opts['newsletter_list_id'] ) ? trim( (string) $opts['newsletter_list_id'] ) : '';
		$double   = ! empty( $opts['newsletter_double_optin'] );

		if ( '' === $api_key || 'none' === $provider ) {
			return;
		}

		$first = isset( $extra['first'] ) ? (string) $extra['first'] : '';
		$last  = isset( $extra['last'] ) ? (string) $extra['last'] : '';

		switch ( $provider ) {
			case 'mailchimp':
				$this->mailchimp( $email, $first, $last, $api_key, $list_id, $double );
				break;
			case 'brevo':
				$this->brevo( $email, $first, $last, $api_key, $list_id, $double );
				break;
			case 'cleverreach':
				$this->cleverreach( $email, $first, $last, $api_key, $list_id );
				break;
		}
	}

	private function log_error( $provider, $result ) {
		if ( ! ( defined( 'WP_DEBUG' ) && WP_DEBUG ) ) {
			return;
		}
		$msg = is_wp_error( $result ) ? $result->get_error_message() : wp_remote_retrieve_body( $result );
		// phpcs:ignore WordPress.PHP.DevelopmentFunctions.error_log_error_log
		error_log( '[Adventura] Newsletter (' . $provider . '): ' . $msg );
	}

	/**
	 * Mailchimp Marketing API v3.
	 */
	private function mailchimp( $email, $first, $last, $api_key, $list_id, $double ) {
		// The data centre is the part after the dash in the API key.
		$parts = explode( '-', $api_key );
		$dc    = isset( $parts[1] ) ? $parts[1] : '';
		if ( '' === $dc || '' === $list_id ) {
			return;
		}

		$url  = 'https://' . $dc . '.api.mailchimp.com/3.0/lists/' . rawurlencode( $list_id ) . '/members/' . md5( strtolower( $email ) );
		$body = array(
			'email_address' => $email,
			'status_if_new' => $double ? 'pending' : 'subscribed',
			'merge_fields'  => array(
				'FNAME' => $first,
				'LNAME' => $last,
			),
		);

		$result = wp_remote_request(
			$url,
			array(
				'method'  => 'PUT',
				'timeout' => 10,
				'headers' => array(
					'Authorization' => 'Basic ' . base64_encode( 'anystring:' . $api_key ),
					'Content-Type'  => 'application/json',
				),
				'body'    => wp_json_encode( $body ),
			)
		);

		if ( is_wp_error( $result ) || (int) wp_remote_retrieve_response_code( $result ) >= 400 ) {
			$this->log_error( 'mailchimp', $result );
		}
	}

	/**
	 * Brevo (formerly Sendinblue) Contacts API v3.
	 */
	private function brevo( $email, $first, $last, $api_key, $list_id, $double ) {
		$body = array(
			'email'         => $email,
			'updateEnabled' => true,
			'attributes'    => array(
				'FIRSTNAME' => $first,
				'LASTNAME'  => $last,
			),
		);
		if ( '' !== $list_id ) {
			$body['listIds'] = array( (int) $list_id );
		}

		$result = wp_remote_post(
			'https://api.brevo.com/v3/contacts',
			array(
				'timeout' => 10,
				'headers' => array(
					'api-key'      => $api_key,
					'Content-Type' => 'application/json',
					'Accept'       => 'application/json',
				),
				'body'    => wp_json_encode( $body ),
			)
		);

		if ( is_wp_error( $result ) || (int) wp_remote_retrieve_response_code( $result ) >= 400 ) {
			$this->log_error( 'brevo', $result );
		}
	}

	/**
	 * CleverReach REST API v3 (token in API-key field).
	 */
	private function cleverreach( $email, $first, $last, $token, $list_id ) {
		if ( '' === $list_id ) {
			return;
		}

		$body = array(
			'email'      => $email,
			'registered' => time(),
			'activated'  => time(),
			'source'     => 'Adventura',
			'global_attributes' => array(
				'firstname' => $first,
				'lastname'  => $last,
			),
		);

		$result = wp_remote_post(
			'https://rest.cleverreach.com/v3/groups.json/' . rawurlencode( $list_id ) . '/receivers',
			array(
				'timeout' => 10,
				'headers' => array(
					'Authorization' => 'Bearer ' . $token,
					'Content-Type'  => 'application/json',
				),
				'body'    => wp_json_encode( $body ),
			)
		);

		if ( is_wp_error( $result ) || (int) wp_remote_retrieve_response_code( $result ) >= 400 ) {
			$this->log_error( 'cleverreach', $result );
		}
	}
}