<?php

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

/**
 * Local WordPress mail notifications for the directory package.
 *
 * No external mail service, tracking endpoint or license server is contacted.
 */
class DPSUPPORT_Notifications {
	public static function notify_staff_new_ticket( $ticket_id, $message_id = 0 ) {
		if ( ! self::option_enabled( 'dpsupport_notify_staff_new_ticket', true ) ) {
			return false;
		}

		$ticket = self::get_ticket( $ticket_id );
		if ( ! $ticket ) {
			return false;
		}

		$message = $message_id ? self::get_message( $message_id ) : null;
		$subject = sprintf( '[%1$s Support] Neues Ticket %2$s – %3$s', self::site_name(), $ticket->ticket_number, $ticket->subject );
		$body = array(
			'Ein neues Support-Ticket wurde erstellt.',
			'',
			'Ticket: ' . $ticket->ticket_number,
			'Kunde: ' . ( $ticket->customer_name ?: '—' ),
			'E-Mail: ' . ( $ticket->customer_email ?: '—' ),
			'Betreff: ' . $ticket->subject,
		);
		if ( $message ) {
			$body[] = '';
			$body[] = 'Nachricht:';
			$body[] = self::message_excerpt( $message->body );
		}
		$body[] = '';
		$body[] = 'Ticket im Backend öffnen:';
		$body[] = self::admin_ticket_url( $ticket->id );

		return self::send( self::staff_recipients(), $subject, implode( "\n", $body ) );
	}

	public static function notify_staff_customer_reply( $ticket_id, $message_id ) {
		if ( ! self::option_enabled( 'dpsupport_notify_staff_customer_reply', true ) ) {
			return false;
		}

		$ticket  = self::get_ticket( $ticket_id );
		$message = self::get_message( $message_id );
		if ( ! $ticket || ! $message ) {
			return false;
		}

		$subject = sprintf( '[%1$s Support] Neue Kundenantwort %2$s – %3$s', self::site_name(), $ticket->ticket_number, $ticket->subject );
		$body = array(
			'Ein Kunde hat auf ein Support-Ticket geantwortet.',
			'',
			'Ticket: ' . $ticket->ticket_number,
			'Kunde: ' . ( $ticket->customer_name ?: '—' ),
			'Betreff: ' . $ticket->subject,
			'',
			'Antwort:',
			self::message_excerpt( $message->body ),
			'',
			'Ticket im Backend öffnen:',
			self::admin_ticket_url( $ticket->id ),
		);

		return self::send( self::staff_recipients(), $subject, implode( "\n", $body ) );
	}

	public static function notify_customer_staff_reply( $ticket_id, $message_id ) {
		$result = self::notify_customer_staff_reply_detailed( $ticket_id, $message_id );
		return ! empty( $result['sent'] );
	}

	public static function notify_customer_staff_reply_detailed( $ticket_id, $message_id ) {
		if ( ! self::option_enabled( 'dpsupport_notify_customer_staff_reply', true ) ) {
			return array( 'sent' => false, 'message' => __( 'Kundenbenachrichtigung ist deaktiviert.', '24laser-support-tickets' ) );
		}

		$ticket  = self::get_ticket( $ticket_id );
		$message = self::get_message( $message_id );
		if ( ! $ticket || ! $message ) {
			return array( 'sent' => false, 'message' => __( 'Ticket oder Nachricht wurde nicht gefunden.', '24laser-support-tickets' ) );
		}

		$recipient = self::resolve_customer_recipient( $ticket );
		if ( ! $recipient ) {
			return array( 'sent' => false, 'message' => __( 'Keine gültige Kunden-E-Mail-Adresse vorhanden.', '24laser-support-tickets' ) );
		}

		$subject = sprintf( '[%1$s Support] Antwort zu %2$s – %3$s', self::site_name(), $ticket->ticket_number, $ticket->subject );
		$body = array(
			'Hallo ' . ( $ticket->customer_name ?: '' ) . ',',
			'',
			'unser Support-Team hat auf dein Ticket ' . $ticket->ticket_number . ' geantwortet.',
			'',
			wp_strip_all_tags( (string) $message->body ),
		);
		$url = self::customer_ticket_url( $ticket );
		if ( $url ) {
			$body[] = '';
			$body[] = 'Ticket ansehen / antworten:';
			$body[] = $url;
		}
		$body[] = '';
		$body[] = 'Viele Grüße';
		$body[] = self::site_name();

		$result = self::send_detailed( array( $recipient ), $subject, implode( "\n", $body ) );
		return array(
			'sent'      => ! empty( $result['sent'] ),
			'recipient' => $recipient,
			'message'   => ! empty( $result['sent'] ) ? __( 'Kundenbenachrichtigung wurde versendet.', '24laser-support-tickets' ) : ( $result['error'] ?? __( 'Kundenbenachrichtigung konnte nicht versendet werden.', '24laser-support-tickets' ) ),
		);
	}

	public static function notify_customer_ticket_created( $ticket_id, $message_id = 0, $created_by_customer = false ) {
		unset( $message_id, $created_by_customer );
		if ( ! self::option_enabled( 'dpsupport_notify_customer_ticket_created', true ) ) {
			return false;
		}

		$ticket = self::get_ticket( $ticket_id );
		if ( ! $ticket ) {
			return false;
		}

		$recipient = self::resolve_customer_recipient( $ticket );
		if ( ! $recipient ) {
			return false;
		}

		$subject = sprintf( '[%1$s Support] Ticket %2$s eingegangen', self::site_name(), $ticket->ticket_number );
		$body = array(
			'Hallo ' . ( $ticket->customer_name ?: '' ) . ',',
			'',
			'deine Support-Anfrage ist bei uns eingegangen.',
			'',
			'Ticket: ' . $ticket->ticket_number,
			'Betreff: ' . $ticket->subject,
		);
		$url = self::customer_ticket_url( $ticket );
		if ( $url ) {
			$body[] = '';
			$body[] = 'Ticket ansehen / antworten:';
			$body[] = $url;
		}
		$body[] = '';
		$body[] = 'Viele Grüße';
		$body[] = self::site_name();

		return self::send( array( $recipient ), $subject, implode( "\n", $body ) );
	}

	public static function send_guest_access_link_detailed( $ticket_id ) {
		$ticket = self::get_ticket( $ticket_id );
		if ( ! $ticket || ! empty( $ticket->customer_id ) ) {
			return array( 'sent' => false, 'message' => __( 'Dieses Ticket ist kein Gastticket.', '24laser-support-tickets' ) );
		}

		$recipient = self::resolve_customer_recipient( $ticket );
		$url       = DPSUPPORT_Guest_Ticket_Access::ticket_url( $ticket );
		if ( ! $recipient || ! $url ) {
			return array( 'sent' => false, 'message' => __( 'Gastzugang konnte nicht erzeugt werden.', '24laser-support-tickets' ) );
		}

		$subject = sprintf( '[%1$s Support] Zugang zu Ticket %2$s', self::site_name(), $ticket->ticket_number );
		$body = array(
			'Hallo ' . ( $ticket->customer_name ?: '' ) . ',',
			'',
			'hier ist dein persönlicher Zugang zum Support-Ticket ' . $ticket->ticket_number . '.',
			'',
			$url,
			'',
			'Bitte behandle diesen persönlichen Link vertraulich.',
		);
		$result = self::send_detailed( array( $recipient ), $subject, implode( "\n", $body ) );

		return array(
			'sent'      => ! empty( $result['sent'] ),
			'recipient' => $recipient,
			'message'   => ! empty( $result['sent'] ) ? __( 'Gastzugangslink wurde versendet.', '24laser-support-tickets' ) : ( $result['error'] ?? __( 'Gastzugangslink konnte nicht versendet werden.', '24laser-support-tickets' ) ),
		);
	}

	public static function send_test_email( $recipient ) {
		$recipient = sanitize_email( $recipient );
		if ( ! $recipient || ! is_email( $recipient ) ) {
			return array( 'sent' => false, 'message' => __( 'Bitte gib eine gültige E-Mail-Adresse ein.', '24laser-support-tickets' ) );
		}

		$result = self::send_detailed(
			array( $recipient ),
			sprintf( '[%s Support] Test-E-Mail', self::site_name() ),
			"24laser Support Tickets Free\n\nDer WordPress-Mailversand funktioniert für diese Testnachricht."
		);

		return array(
			'sent'    => ! empty( $result['sent'] ),
			'message' => ! empty( $result['sent'] ) ? __( 'Test-E-Mail wurde versendet.', '24laser-support-tickets' ) : ( $result['error'] ?? __( 'Test-E-Mail konnte nicht versendet werden.', '24laser-support-tickets' ) ),
		);
	}

	private static function get_ticket( $ticket_id ) {
		return ( new DPSUPPORT_Ticket_Repository() )->get( absint( $ticket_id ) );
	}

	private static function get_message( $message_id ) {
		return ( new DPSUPPORT_Message_Repository() )->get( absint( $message_id ) );
	}

	private static function staff_recipients() {
		$raw = (string) get_option( 'dpsupport_notification_email', get_option( 'admin_email', '' ) );
		$parts = preg_split( '/[;,\s]+/', $raw );
		$valid = array();
		foreach ( (array) $parts as $email ) {
			$email = sanitize_email( $email );
			if ( $email && is_email( $email ) ) {
				$valid[ strtolower( $email ) ] = $email;
			}
		}
		return array_values( $valid );
	}

	private static function resolve_customer_recipient( $ticket ) {
		if ( ! is_object( $ticket ) ) {
			return '';
		}
		$email = sanitize_email( (string) ( $ticket->customer_email ?? '' ) );
		if ( $email && is_email( $email ) ) {
			return $email;
		}
		if ( ! empty( $ticket->customer_id ) ) {
			$user = get_user_by( 'id', absint( $ticket->customer_id ) );
			if ( $user && is_email( $user->user_email ) ) {
				return sanitize_email( $user->user_email );
			}
		}
		return '';
	}

	private static function send_detailed( array $recipients, $subject, $body ) {
		$recipients = array_values( array_filter( array_unique( array_map( 'sanitize_email', $recipients ) ), 'is_email' ) );
		if ( ! $recipients ) {
			return array( 'sent' => false, 'error' => __( 'Keine gültige Empfängeradresse vorhanden.', '24laser-support-tickets' ), 'transport' => 'wordpress' );
		}

		$subject = str_replace( array( "\r", "\n" ), '', wp_strip_all_tags( (string) $subject ) );
		$headers = array( 'Content-Type: text/plain; charset=UTF-8', 'X-24laser-Support-System: outbound' );
		$from_email = self::support_from_email();
		$from_name  = self::support_from_name();
		$reply_to   = self::support_reply_to_email();
		if ( $from_email ) {
			$headers[] = 'From: ' . self::format_mailbox_header( $from_name, $from_email );
		}
		if ( $reply_to ) {
			$headers[] = 'Reply-To: ' . self::format_mailbox_header( $from_name, $reply_to );
		}

		$captured_error = '';
		$failure_callback = static function ( $error ) use ( &$captured_error ) {
			if ( is_wp_error( $error ) ) {
				$captured_error = $error->get_error_message();
			}
		};
		add_action( 'wp_mail_failed', $failure_callback, 999, 1 );
		try {
			$sent = (bool) wp_mail( $recipients, $subject, (string) $body, $headers );
		} catch ( Throwable $error ) {
			$sent = false;
			$captured_error = $error->getMessage();
		} finally {
			remove_action( 'wp_mail_failed', $failure_callback, 999 );
		}

		return array(
			'sent'      => $sent,
			'error'     => $sent ? '' : sanitize_text_field( $captured_error ?: __( 'wp_mail() hat false zurückgegeben.', '24laser-support-tickets' ) ),
			'transport' => 'wordpress',
		);
	}

	private static function support_from_email() {
		foreach ( array( get_option( 'dpsupport_support_from_email', '' ), get_option( 'admin_email', '' ) ) as $candidate ) {
			$email = sanitize_email( (string) $candidate );
			if ( $email && is_email( $email ) ) {
				return $email;
			}
		}
		return '';
	}

	private static function support_reply_to_email() {
		$email = sanitize_email( (string) get_option( 'dpsupport_support_reply_to_email', '' ) );
		return $email && is_email( $email ) ? $email : self::support_from_email();
	}

	private static function support_from_name() {
		$name = sanitize_text_field( (string) get_option( 'dpsupport_support_from_name', self::site_name() . ' Support' ) );
		return $name ?: self::site_name() . ' Support';
	}

	private static function format_mailbox_header( $name, $email ) {
		$name  = str_replace( array( "\r", "\n", '"' ), '', sanitize_text_field( $name ) );
		$email = sanitize_email( $email );
		return $name ? sprintf( '"%s" <%s>', $name, $email ) : $email;
	}

	private static function send( array $recipients, $subject, $body ) {
		$result = self::send_detailed( $recipients, $subject, $body );
		return ! empty( $result['sent'] );
	}

	private static function option_enabled( $name, $default = true ) {
		return 'yes' === get_option( $name, $default ? 'yes' : 'no' );
	}

	private static function message_excerpt( $body ) {
		$text = trim( wp_strip_all_tags( (string) $body ) );
		return mb_strlen( $text ) > 1200 ? mb_substr( $text, 0, 1200 ) . '…' : $text;
	}

	private static function admin_ticket_url( $ticket_id ) {
		return add_query_arg( array( 'page' => 'dpsupport-support', 'ticket_id' => absint( $ticket_id ) ), admin_url( 'admin.php' ) );
	}

	private static function customer_ticket_url( $ticket ) {
		if ( ! is_object( $ticket ) ) {
			return '';
		}
		if ( empty( $ticket->customer_id ) ) {
			return DPSUPPORT_Guest_Ticket_Access::ticket_url( $ticket );
		}
		if ( function_exists( 'wc_get_account_endpoint_url' ) ) {
			return add_query_arg( 'dpsupport_ticket', absint( $ticket->id ), wc_get_account_endpoint_url( 'support' ) );
		}
		return '';
	}

	private static function site_name() {
		return wp_specialchars_decode( (string) get_bloginfo( 'name' ), ENT_QUOTES );
	}
}