<?php
declare(strict_types=1);

namespace Unsupervised\Schedular\Auth;

use Unsupervised\Schedular\Val;

/**
 * Transactional emails for the self-approval registration flow: the email
 * confirmation link, the studio-admin heads-up that someone is ready to
 * approve, and the approval / rejection notices to the student.
 */
class RegistrationMailer {

	/**
	 * Email the new student a link to confirm their address. Returns false when
	 * there is no recipient.
	 */
	public function sendConfirmation( \WP_User $user, string $confirmUrl ): bool {
		if ( '' === (string) $user->user_email ) {
			return false;
		}

		$subject = sprintf(
			/* translators: %s: site name */
			__( 'Confirm your email for %s', 'unsupervised-schedular' ),
			$this->siteName()
		);

		$body = sprintf(
			/* translators: 1: site name, 2: confirmation URL */
			__( "Thanks for signing up at %1\$s.\n\nPlease confirm your email address by opening this link:\n%2\$s\n\nOnce confirmed, a studio admin will review and approve your account. You'll get another email when it's ready.", 'unsupervised-schedular' ),
			$this->siteName(),
			$confirmUrl
		);

		return (bool) wp_mail( $user->user_email, $subject, $body );
	}

	/**
	 * Tell the studio admins a self-signup has confirmed their email and is
	 * waiting for approval. Sent to the site admin email.
	 */
	public function notifyAdminsPending( \WP_User $user ): bool {
		$adminEmail = Val::string( get_option( 'admin_email', '' ) );
		if ( '' === $adminEmail ) {
			return false;
		}

		$subject = __( 'A new student is awaiting approval', 'unsupervised-schedular' );
		$body    = sprintf(
			/* translators: 1: student name, 2: student email */
			__( "%1\$s (%2\$s) has confirmed their email and is awaiting approval.\n\nReview them under Students → Pending Students in wp-admin.", 'unsupervised-schedular' ),
			(string) $user->display_name,
			(string) $user->user_email
		);

		return (bool) wp_mail( $adminEmail, $subject, $body );
	}

	/**
	 * Tell the student their account has been approved. Returns false when there
	 * is no recipient.
	 */
	public function sendApproved( \WP_User $user ): bool {
		if ( '' === (string) $user->user_email ) {
			return false;
		}

		$subject = sprintf(
			/* translators: %s: site name */
			__( 'Your %s account is approved', 'unsupervised-schedular' ),
			$this->siteName()
		);
		$body = sprintf(
			/* translators: 1: site name, 2: login URL */
			__( "Good news — your account at %1\$s has been approved. You can now log in and book:\n%2\$s", 'unsupervised-schedular' ),
			$this->siteName(),
			wp_login_url()
		);

		return (bool) wp_mail( $user->user_email, $subject, $body );
	}

	/**
	 * Tell an applicant their registration was declined. Takes the email address
	 * directly, since the account is deleted as part of rejection.
	 */
	public function sendRejected( string $email ): bool {
		if ( '' === $email ) {
			return false;
		}

		$subject = sprintf(
			/* translators: %s: site name */
			__( 'Your %s registration', 'unsupervised-schedular' ),
			$this->siteName()
		);
		$body = sprintf(
			/* translators: %s: site name */
			__( 'Thank you for your interest in %s. We are unable to approve your registration at this time. Please contact the studio if you have any questions.', 'unsupervised-schedular' ),
			$this->siteName()
		);

		return (bool) wp_mail( $email, $subject, $body );
	}

	/**
	 * Tell a registered student they have been given access to an invite-only
	 * group class and can now enrol. Returns false when there is no recipient.
	 */
	public function sendClassAccessGranted( \WP_User $user, string $className ): bool {
		if ( '' === (string) $user->user_email ) {
			return false;
		}

		$subject = sprintf(
			/* translators: %s: class title */
			__( 'You have been invited to %s', 'unsupervised-schedular' ),
			$className
		);
		$body = sprintf(
			/* translators: 1: class title, 2: site name, 3: login URL */
			__( "You have been given access to the group class \"%1\$s\" at %2\$s.\n\nLog in and open the group classes page to enrol:\n%3\$s", 'unsupervised-schedular' ),
			$className,
			$this->siteName(),
			wp_login_url()
		);

		return (bool) wp_mail( $user->user_email, $subject, $body );
	}

	/**
	 * Email a tokenised registration link to someone invited to a group class who
	 * does not yet have an account. Returns false when there is no recipient.
	 */
	public function sendClassInvite( string $email, string $link, string $className ): bool {
		if ( '' === $email ) {
			return false;
		}

		$subject = sprintf(
			/* translators: %s: class title */
			__( 'You are invited to join %s', 'unsupervised-schedular' ),
			$className
		);
		$body = sprintf(
			/* translators: 1: class title, 2: site name, 3: registration URL */
			__( "You have been invited to the group class \"%1\$s\" at %2\$s.\n\nCreate your account using this link, then choose to enrol in the class:\n%3\$s", 'unsupervised-schedular' ),
			$className,
			$this->siteName(),
			$link
		);

		return (bool) wp_mail( $email, $subject, $body );
	}

	private function siteName(): string {
		$name = (string) get_bloginfo( 'name' );

		return '' !== $name ? $name : __( 'the studio', 'unsupervised-schedular' );
	}
}