<?php
/**
 * One place that turns "this person wants our emails" into a PostaraMail
 * contact. Forms, registration, comments and WooCommerce all use it.
 */

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

class PostaraMail_Subscriber {

	/**
	 * Sends one signup to PostaraMail (adds the contact, then optionally
	 * enrols them in an automation). No queueing here: see subscribe().
	 *
	 * @param array $item email, first, last, automation (int), source.
	 */
	public static function send( $item ) {
		// "Said no" is sent as a decline, not as a subscription.
		if ( isset( $item['kind'] ) && 'decline' === $item['kind'] ) {
			$email = isset( $item['email'] ) ? sanitize_email( $item['email'] ) : '';
			if ( ! is_email( $email ) ) {
				return array(
					'ok'      => false,
					'retry'   => false,
					'code'    => 'invalid_email',
					'message' => '',
					'created' => false,
				);
			}
			$r = PostaraMail_API::contacts_sync( array(), array( $email ) );
			return array_merge( $r, array( 'created' => false ) );
		}
		$email = isset( $item['email'] ) ? sanitize_email( $item['email'] ) : '';
		if ( ! is_email( $email ) ) {
			return array(
				'ok'      => false,
				'retry'   => false,
				'code'    => 'invalid_email',
				'message' => __( 'Please enter a valid email address.', 'postaramail' ),
				'created' => false,
			);
		}

		$start = (bool) get_option( 'postaramail_start_automations', 1 );
		$r     = PostaraMail_API::add_contact(
			$email,
			isset( $item['first'] ) ? $item['first'] : '',
			isset( $item['last'] ) ? $item['last'] : '',
			$start,
			( isset( $item['source'] ) && 'woocommerce' === $item['source'] ) ? 'woocommerce' : 'WordPress',
			isset( $item['consent'] ) ? substr( (string) $item['consent'], 0, 380 ) : '',
			isset( $item['method'] ) ? $item['method'] : 'optin',
			isset( $item['country'] ) ? $item['country'] : '',
			isset( $item['ip'] ) ? $item['ip'] : '',
			! empty( $item['confirmed'] )
		);
		if ( ! $r['ok'] ) {
			return array_merge( $r, array( 'created' => false ) );
		}

		$created = ! empty( $r['data']['created'] );

		// A specific automation (chosen in the form or in Settings).
		$automation = isset( $item['automation'] ) ? (int) $item['automation'] : 0;
		if ( $automation > 0 ) {
			$e = PostaraMail_API::enroll( $automation, $email );
			// "Not active yet" is a setup issue: tell the admin, but the contact itself was added.
			if ( ! $e['ok'] && ! $e['retry'] ) {
				self::remember_error( $e['message'] );
			} elseif ( ! $e['ok'] ) {
				return array_merge( $e, array( 'created' => $created ) );
			}
		}

		if ( $created ) {
			delete_transient( 'postaramail_me' ); // Usage on the dashboard changes.
		}
		self::count_success( $created );
		return array(
			'ok'      => true,
			'retry'   => false,
			'code'    => '',
			'message' => '',
			'created' => $created,
		);
	}

	/**
	 * Public entry point. Sends now; if PostaraMail is temporarily
	 * unreachable, queues it for retry and still reports success to the visitor.
	 */
	public static function subscribe( $item ) {
		$r = self::send( $item );
		if ( $r['ok'] ) {
			return $r;
		}
		if ( $r['retry'] ) {
			PostaraMail_Queue::push( $item );
			self::remember_error( $r['message'] ? $r['message'] : $r['code'] );
			return array_merge(
				$r,
				array(
					'ok'     => true,
					'queued' => true,
				)
			);
		}
		if ( ! in_array( $r['code'], array( 'invalid_email', 'consent_required', 'contact_not_subscribed' ), true ) ) {
			self::remember_error( $r['message'] ? $r['message'] : $r['code'] ); // Setup problem the owner should see.
		}
		return $r;
	}

	/** Records that someone said no (or queues it for retry). They become "Declined" in PostaraMail. */
	public static function decline( $email ) {
		$item = array(
			'kind'  => 'decline',
			'email' => $email,
		);
		$r    = self::send( $item );
		if ( ! $r['ok'] && $r['retry'] ) {
			PostaraMail_Queue::push( $item );
		}
		return $r;
	}

	/** Friendly text for the visitor. Setup problems are never shown to them. */
	public static function visitor_message( $r, $success_text ) {
		if ( ! empty( $r['ok'] ) ) {
			return $success_text;
		}
		switch ( isset( $r['code'] ) ? $r['code'] : '' ) {
			case 'invalid_email':
				return __( 'Please enter a valid email address.', 'postaramail' );
			case 'contact_not_subscribed':
				return __( 'This email address has unsubscribed, so we can’t add it again.', 'postaramail' );
			default:
				return __( 'Sorry, we couldn’t sign you up just now. Please try again in a little while.', 'postaramail' );
		}
	}

	public static function remember_error( $message ) {
		update_option(
			'postaramail_last_error',
			array(
				'message' => substr( wp_strip_all_tags( (string) $message ), 0, 300 ),
				'time'    => time(),
			),
			false
		);
	}

	private static function count_success( $created ) {
		$s = get_option(
			'postaramail_stats',
			array(
				'added' => 0,
				'last'  => 0,
			)
		);
		if ( $created ) {
			$s['added'] = (int) $s['added'] + 1;
		}
		$s['last'] = time();
		update_option( 'postaramail_stats', $s, false );
	}

	/** Splits "Sara Khan" into first and last name. */
	public static function split_name( $name ) {
		$name  = trim( preg_replace( '/\s+/', ' ', (string) $name ) );
		$parts = explode( ' ', $name, 2 );
		return array( sanitize_text_field( $parts[0] ), isset( $parts[1] ) ? sanitize_text_field( $parts[1] ) : '' );
	}
}