<?php
namespace Bookzenix;

defined( 'ABSPATH' ) || exit;

/**
 * Email notifications with placeholders, HTML layout and an .ics attachment.
 */
class Notifications {

	/** True while the customer should not get the per-appointment email. */
	public static $suppress_customer = false;
	/** True while the employee should not get the per-appointment email. */
	public static $suppress_employee = false;

	public function register() {
		add_action( 'bookzenix_appointment_status_changed', array( $this, 'on_status' ), 10, 3 );
		add_action( 'bookzenix_appointment_rescheduled', array( $this, 'on_reschedule' ), 10, 2 );
	}

	public static function default_templates() {
		$t = array(
			'customer_approved' => array(
				'subject' => 'Your {service_name} is confirmed – {appointment_date}',
				'body'    => "Hi {customer_first_name},\n\nGreat news! Your {service_name} with {employee_name} is confirmed for {appointment_date} at {appointment_time}.\n\nWhere: {location}\nTotal: {appointment_price}\n\nNeed to change something? Manage your booking here:\n{manage_link}\n\nSee you soon,\n{company_name}",
			),
			'customer_pending'  => array(
				'subject' => 'We received your booking request',
				'body'    => "Hi {customer_first_name},\n\nThanks for booking {service_name} on {appointment_date} at {appointment_time}. We'll confirm it shortly.\n\nManage your booking: {manage_link}\n\n{company_name}",
			),
			'customer_canceled' => array(
				'subject' => 'Your appointment was canceled',
				'body'    => "Hi {customer_first_name},\n\nYour {service_name} on {appointment_date} at {appointment_time} has been canceled.\n\nBook again anytime: {booking_page}\n\n{company_name}",
			),
			'customer_rescheduled' => array(
				'subject' => 'Your appointment was moved to {appointment_date}',
				'body'    => "Hi {customer_first_name},\n\nYour {service_name} is now on {appointment_date} at {appointment_time} with {employee_name}.\n\nManage your booking: {manage_link}\n\n{company_name}",
			),
			'employee_new'      => array(
				'subject' => 'New booking: {service_name} on {appointment_date}',
				'body'    => "Hi {employee_name},\n\nYou have a new appointment.\n\nService: {service_name}\nWhen: {appointment_date} {appointment_time}\nCustomer: {customer_full_name} ({customer_email}, {customer_phone})\nNote: {customer_note}\n\n{company_name}",
			),
			'admin_new'         => array(
				'subject' => '[{company_name}] New booking #{appointment_id}',
				'body'    => "New booking received.\n\nService: {service_name}\nEmployee: {employee_name}\nWhen: {appointment_date} {appointment_time}\nCustomer: {customer_full_name} ({customer_email})\nStatus: {appointment_status}\nPrice: {appointment_price}",
			),
		);
		// Customers change bookings by contacting the business, so the emails carry no manage link.
		foreach ( $t as $k => $x ) {
			$t[ $k ]['body'] = preg_replace( '/\n\n[^\n]*\n?\{manage_link\}/', '', $x['body'] );
		}
		return $t;
	}

	public static function placeholders() {
		return array( 'customer_first_name', 'customer_full_name', 'customer_email', 'customer_phone', 'customer_note', 'service_name', 'employee_name', 'appointment_id', 'appointment_date', 'appointment_time', 'appointment_end_time', 'appointment_price', 'appointment_status', 'location', 'booking_page', 'company_name', 'company_phone' );
	}

	public function on_status( $appt, $old, $new ) {
		$n    = Settings::get( 'notifications' );
		$appt = Repository::appointment( $appt['id'] ) ?: $appt; // fresh copy with all joined fields
		if ( null === $old ) {
			// Brand new booking.
			if ( ! empty( $n['admin_new'] ) ) {
				self::send( 'admin_new', $appt, Settings::get( 'company_email' ) );
			}
			if ( ! empty( $n['employee_new'] ) && ! empty( $appt['employee_email'] ) && ! self::$suppress_employee ) {
				self::send( 'employee_new', $appt, $appt['employee_email'] );
			}
		}
		$map = array(
			'approved' => 'customer_approved',
			'pending'  => 'customer_pending',
			'canceled' => 'customer_canceled',
			'rejected' => 'customer_canceled',
		);
		if ( isset( $map[ $new ] ) && ! empty( $n[ $map[ $new ] ] ) && ! self::$suppress_customer ) {
			self::send( $map[ $new ], $appt, $appt['customer_email'], 'approved' === $new );
		}
	}

	/** Plain email in the branded layout. */
	public static function mail( $to, $subject, $text, array $attachments = array() ) {
		if ( ! is_email( $to ) ) {
			return false;
		}
		$body = self::layout( nl2br( esc_html( $text ) ) );
		$body = preg_replace( '~(https?://[^\s<]+)~', '<a href="$1" style="color:' . esc_attr( Settings::get( 'primary_color' ) ) . '">$1</a>', $body );
		return wp_mail( $to, $subject, $body, array( 'Content-Type: text/html; charset=UTF-8', 'From: ' . Settings::get( 'company_name' ) . ' <' . Settings::get( 'company_email' ) . '>' ), $attachments );
	}

	public function on_reschedule( $appt ) {
		$appt = Repository::appointment( $appt['id'] ) ?: $appt;
		if ( ! self::$suppress_customer ) {
			self::send( 'customer_rescheduled', $appt, $appt['customer_email'], true );
		}
		if ( ! empty( $appt['employee_email'] ) && ! self::$suppress_employee ) {
			self::send( 'employee_new', $appt, $appt['employee_email'] );
		}
	}

	public static function render( $text, array $appt ) {
		$s    = Settings::all();
		$vars = array(
			'customer_first_name'  => $appt['customer_first_name'] ?? '',
			'customer_full_name'   => $appt['customer_name'] ?? '',
			'customer_email'       => $appt['customer_email'] ?? '',
			'customer_phone'       => $appt['customer_phone'] ?? '',
			'customer_note'        => $appt['customer_note'] ?? '',
			'service_name'         => $appt['service_name'] ?? '',
			'employee_name'        => trim( $appt['employee_name'] ?? '' ),
			'appointment_id'       => $appt['id'] ?? '',
			'appointment_date'     => isset( $appt['start_utc'] ) ? wp_date( get_option( 'date_format' ), strtotime( $appt['start_utc'] . ' UTC' ) ) : '',
			'appointment_time'     => isset( $appt['start_utc'] ) ? wp_date( get_option( 'time_format' ), strtotime( $appt['start_utc'] . ' UTC' ) ) : '',
			'appointment_end_time' => isset( $appt['end_utc'] ) ? wp_date( get_option( 'time_format' ), strtotime( $appt['end_utc'] . ' UTC' ) ) : '',
			'appointment_price'    => $s['currency_symbol'] . number_format_i18n( (float) ( $appt['price'] ?? 0 ), 2 ),
			'appointment_status'   => ucfirst( $appt['status'] ?? '' ),
			'location'             => self::location( $appt ),
			'booking_page'         => home_url( '/' ),
			'company_name'         => $s['company_name'],
			'company_phone'        => $s['company_phone'],
		);
		$vars = apply_filters( 'bookzenix_placeholders', $vars, $appt );
		foreach ( $vars as $k => $v ) {
			$text = str_replace( '{' . $k . '}', (string) $v, $text );
		}
		return $text;
	}

	/** Human-readable "where": meeting link, address, or business name. */
	public static function location( array $appt ) {
		return ! empty( $appt['location_text'] ) ? $appt['location_text'] : Settings::get( 'company_name' );
	}

	public static function send( $template, array $appt, $to, $attach_ics = false ) {
		if ( ! is_email( $to ) ) {
			return false;
		}
		$tpls = Settings::get( 'templates' );
		$tpl  = $tpls[ $template ] ?? ( self::default_templates()[ $template ] ?? null );
		if ( ! $tpl ) {
			return false;
		}
		$subject = self::render( $tpl['subject'], $appt );
		$body    = self::layout( nl2br( esc_html( self::render( $tpl['body'], $appt ) ) ) );
		// Make the manage link clickable.
		$body = preg_replace( '~(https?://[^\s<]+)~', '<a href="$1" style="color:' . esc_attr( Settings::get( 'primary_color' ) ) . '">$1</a>', $body );

		$headers     = array( 'Content-Type: text/html; charset=UTF-8', 'From: ' . Settings::get( 'company_name' ) . ' <' . Settings::get( 'company_email' ) . '>' );
		$attachments = array();
		if ( $attach_ics ) {
			$file = self::ics_file( $appt );
			if ( $file ) {
				$attachments[] = $file;
			}
		}
		$ok = wp_mail( $to, $subject, $body, $headers, $attachments );
		foreach ( $attachments as $f ) {
			wp_delete_file( $f );
		}

		global $wpdb;
		$wpdb->insert(
			Plugin::table( 'notification_log' ),
			array(
				'appointment_id' => $appt['id'] ?? null,
				'template'       => $template,
				'recipient'      => $to,
				'success'        => $ok ? 1 : 0,
				'created_at'     => current_time( 'mysql', true ),
			)
		);
		return $ok;
	}

	public static function layout( $inner ) {
		$c    = esc_attr( Settings::get( 'primary_color' ) );
		$name = esc_html( Settings::get( 'company_name' ) );
		return '<!doctype html><html><body style="margin:0;background:#f4f5f7;font-family:-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif">'
			. '<table width="100%" cellpadding="0" cellspacing="0"><tr><td align="center" style="padding:32px 12px">'
			. '<table width="560" cellpadding="0" cellspacing="0" style="max-width:560px;background:#fff;border-radius:14px;overflow:hidden">'
			. '<tr><td style="background:' . $c . ';padding:22px 28px;color:#fff;font-size:18px;font-weight:600">' . $name . '</td></tr>'
			. '<tr><td style="padding:28px;color:#1f2937;font-size:15px;line-height:1.6">' . $inner . '</td></tr>'
			. '</table></td></tr></table></body></html>';
	}

	/** Build a temporary .ics file. */
	public static function ics_file( array $appt ) {
		$ics = self::ics( $appt );
		$up  = wp_upload_dir();
		$dir = trailingslashit( $up['basedir'] ) . 'bookzenix-tmp';
		if ( ! wp_mkdir_p( $dir ) ) {
			return false;
		}
		$file = $dir . '/appointment-' . (int) $appt['id'] . '-' . wp_generate_password( 8, false ) . '.ics';
		return false !== file_put_contents( $file, $ics ) ? $file : false; // phpcs:ignore
	}

	public static function ics( array $appt ) {
		$fmt = function ( $utc ) {
			return gmdate( 'Ymd\THis\Z', strtotime( $utc . ' UTC' ) );
		};
		$esc = function ( $s ) {
			return addcslashes( (string) $s, ",;\\" );
		};
		$lines = array(
			'BEGIN:VCALENDAR',
			'VERSION:2.0',
			'PRODID:-//Bookzenix//Booking//EN',
			'METHOD:PUBLISH',
			'BEGIN:VEVENT',
			'UID:bkz-' . (int) $appt['id'] . '@' . wp_parse_url( home_url(), PHP_URL_HOST ),
			'DTSTAMP:' . gmdate( 'Ymd\THis\Z' ),
			'DTSTART:' . $fmt( $appt['start_utc'] ),
			'DTEND:' . $fmt( $appt['end_utc'] ),
			'SUMMARY:' . $esc( $appt['service_name'] . ' – ' . Settings::get( 'company_name' ) ),
			'DESCRIPTION:' . $esc( 'With ' . trim( $appt['employee_name'] ) ),
			'LOCATION:' . $esc( self::location( $appt ) ),
			'END:VEVENT',
			'END:VCALENDAR',
		);
		return implode( "\r\n", $lines ) . "\r\n";
	}
}