<?php
/**
 * Helper functions.
 */

defined( 'ABSPATH' ) || exit;

function ethebo_defaults() {
	return (array) apply_filters( 'ethebo_defaults', array(
		'language'      => 'en',
		'currency'      => '€',
		'admin_email'   => get_option( 'admin_email' ),
		'auto_confirm'  => 0,
		'guest_emails'  => 1,
		'sync_interval' => 'ethebo_30min',
		'accent'        => '#2563eb',
		'delete_data'   => 0,
		'mail_from_name'  => '',
		'mail_from_email' => '',
		// Payments (online methods and their keys are added by Ethereal Booking Pro).
		'pay_methods'    => array( 'arrival' ),
		'bank_details'   => '',
		'arrival_note'   => '',
		'currency_code'  => 'EUR',
		'deposit'        => 100,
	) );
}

/**
 * HTML the plugin prints (escaped late with wp_kses()): post HTML plus the forms of the search bar
 * and the booking form, and the plugin's inline SVG icons.
 */
function ethebo_allowed_html() {
	static $allowed = null;
	if ( null !== $allowed ) {
		return $allowed;
	}
	$common = array(
		'class'       => true,
		'id'          => true,
		'style'       => true,
		'title'       => true,
		'role'        => true,
		'hidden'      => true,
		'tabindex'    => true,
		'data-*'      => true,
		'aria-*'      => true,
		'aria-hidden' => true,
		'aria-label'  => true,
	);
	$field  = $common + array(
		'type'         => true,
		'name'         => true,
		'value'        => true,
		'checked'      => true,
		'selected'     => true,
		'disabled'     => true,
		'readonly'     => true,
		'required'     => true,
		'placeholder'  => true,
		'min'          => true,
		'max'          => true,
		'step'         => true,
		'rows'         => true,
		'autocomplete' => true,
		'inputmode'    => true,
		'for'          => true,
		'form'         => true,
	);
	$svg    = array(
		'class'           => true,
		'viewbox'         => true,
		'width'           => true,
		'height'          => true,
		'fill'            => true,
		'stroke'          => true,
		'stroke-width'    => true,
		'stroke-linecap'  => true,
		'stroke-linejoin' => true,
		'aria-hidden'     => true,
		'focusable'       => true,
		'role'            => true,
		'xmlns'           => true,
		'd'               => true,
		'x'               => true,
		'y'               => true,
		'rx'              => true,
		'ry'              => true,
		'cx'              => true,
		'cy'              => true,
		'r'               => true,
		'points'          => true,
		'x1'              => true,
		'y1'              => true,
		'x2'              => true,
		'y2'              => true,
	);
	$allowed = wp_kses_allowed_html( 'post' );
	foreach ( array( 'div', 'span', 'p', 'a', 'ul', 'ol', 'li', 'section', 'article', 'header', 'nav', 'img', 'strong', 'em', 'b', 'i', 'small', 'h2', 'h3', 'h4', 'details', 'summary', 'dl', 'dt', 'dd' ) as $tag ) {
		$allowed[ $tag ] = ( $allowed[ $tag ] ?? array() ) + $common;
	}
	$allowed['img']      += array( 'src' => true, 'srcset' => true, 'sizes' => true, 'alt' => true, 'width' => true, 'height' => true, 'loading' => true, 'decoding' => true, 'fetchpriority' => true );
	$allowed['a']        += array( 'href' => true, 'target' => true, 'rel' => true );
	$allowed['form']      = $common + array( 'action' => true, 'method' => true, 'novalidate' => true, 'autocomplete' => true );
	$allowed['fieldset']  = $common;
	$allowed['legend']    = $common;
	$allowed['label']     = $field;
	$allowed['input']     = $field;
	$allowed['select']    = $field;
	$allowed['option']    = $field;
	$allowed['textarea']  = $field;
	$allowed['button']    = $field;
	$allowed['output']    = $field;
	$allowed['noscript']  = array();
	foreach ( array( 'svg', 'path', 'rect', 'circle', 'line', 'polyline', 'g' ) as $tag ) {
		$allowed[ $tag ] = $svg;
	}
	return $allowed;
}

function ethebo_opt( $key ) {
	$opts = wp_parse_args( (array) get_option( 'ethebo_settings', array() ), ethebo_defaults() );
	return isset( $opts[ $key ] ) ? $opts[ $key ] : null;
}

function ethebo_cron_schedules( $schedules ) {
	$schedules['ethebo_15min'] = array( 'interval' => 15 * MINUTE_IN_SECONDS, 'display' => 'Every 15 minutes' );
	$schedules['ethebo_30min'] = array( 'interval' => 30 * MINUTE_IN_SECONDS, 'display' => 'Every 30 minutes' );
	return $schedules;
}

function ethebo_sync_intervals() {
	return array(
		'ethebo_15min'  => ethebo__( 'Every 15 minutes' ),
		'ethebo_30min'  => ethebo__( 'Every 30 minutes' ),
		'hourly'     => ethebo__( 'Every hour' ),
		'twicedaily' => ethebo__( 'Twice a day' ),
	);
}

function ethebo_statuses() {
	return array(
		'pending'   => ethebo__( 'Pending' ),
		'confirmed' => ethebo__( 'Confirmed' ),
		'blocked'   => ethebo__( 'Blocked' ),
		'cancelled' => ethebo__( 'Cancelled' ),
	);
}

function ethebo_source_label( $source ) {
	$labels = array(
		'website' => ethebo__( 'Website' ),
		'manual'  => ethebo__( 'Manual' ),
		'booking' => 'Booking.com',
		'airbnb'  => 'Airbnb',
	);
	if ( isset( $labels[ $source ] ) ) {
		return $labels[ $source ];
	}
	return 0 === strpos( $source, 'ical' ) ? 'iCal' : $source;
}

/** Bookings made on the website or added manually – everything else comes from sync. */
function ethebo_is_local_source( $source ) {
	return in_array( $source, array( 'website', 'manual' ), true );
}

function ethebo_price( $amount ) {
	$amount   = (float) $amount;
	$decimals = floor( $amount ) == $amount ? 0 : 2;
	return number_format_i18n( $amount, $decimals ) . ' ' . ethebo_opt( 'currency' );
}

function ethebo_valid_date( $date ) {
	$d = DateTime::createFromFormat( '!Y-m-d', (string) $date );
	return $d && $d->format( 'Y-m-d' ) === $date;
}

function ethebo_nights( $check_in, $check_out ) {
	$a = new DateTimeImmutable( $check_in, new DateTimeZone( 'UTC' ) );
	$b = new DateTimeImmutable( $check_out, new DateTimeZone( 'UTC' ) );
	return $b > $a ? (int) $a->diff( $b )->days : 0;
}

function ethebo_format_date( $date ) {
	return wp_date( 'd.m.Y', strtotime( $date . ' 00:00:00 UTC' ), new DateTimeZone( 'UTC' ) );
}

function ethebo_meta( $post_id, $key, $default = '' ) {
	$value = get_post_meta( $post_id, '_ethebo_' . $key, true );
	return '' === $value ? $default : $value;
}

/* -------------------------------------------------------------------------
 * Email
 *
 * Every email is sent as HTML (clean, in the site colour) with a plain-text
 * version inside the same message, from the sender set in Settings. Both help
 * the email land in the Inbox instead of Spam.
 * ---------------------------------------------------------------------- */

/** Booking details as label => value (empty values skipped). */
function ethebo_booking_rows( $b ) {
	$rows = array(
		ethebo__( 'Booking' )   => '#' . $b->id,
		ethebo__( 'Property' )  => get_the_title( $b->property_id ),
		ethebo__( 'Check-in' )  => ethebo_format_date( $b->check_in ),
		ethebo__( 'Check-out' ) => ethebo_format_date( $b->check_out ),
		ethebo__( 'Nights' )    => ethebo_nights( $b->check_in, $b->check_out ),
		ethebo__( 'Guests' )    => $b->guests,
		ethebo__( 'Total' )     => ethebo_price( $b->total ),
		ethebo__( 'Payment' )   => $b->payment_method ? ETHEBO_Payments::label( $b->payment_method ) . ' – ' . ETHEBO_Payments::status_label( $b ) : '',
		ethebo__( 'Name' )      => $b->guest_name,
		ethebo__( 'Email' )     => $b->guest_email,
		ethebo__( 'Phone' )     => $b->guest_phone,
		ethebo__( 'Notes' )     => $b->notes,
	);
	return array_filter( $rows, function ( $v ) {
		return '' !== trim( (string) $v );
	} );
}

/** Plain-text summary (also used in the text part of the emails). */
function ethebo_booking_summary( $b ) {
	$lines = array();
	foreach ( ethebo_booking_rows( $b ) as $label => $value ) {
		$lines[] = str_pad( $label . ':', 14 ) . $value;
	}
	return implode( "\n", $lines );
}

/**
 * Sends a booking email.
 *
 * @param string      $to       Recipient.
 * @param string      $subject  Subject.
 * @param string      $intro    First paragraph(s).
 * @param object|null $b        Booking (its details are listed) or null.
 * @param string      $extra    Extra block, e.g. bank details (shown in a box).
 * @param string      $reply_to Reply-To address.
 * @param array       $button   [ url, label ] optional button.
 */
function ethebo_send_mail( $to, $subject, $intro, $b = null, $extra = '', $reply_to = '', $button = array() ) {
	$subject = trim( preg_replace( '/[\r\n\t]+/', ' ', (string) $subject ) ); // A subject can never add email headers.
	$site   = get_bloginfo( 'name' );
	$rows   = $b ? ethebo_booking_rows( $b ) : array();
	$accent = sanitize_hex_color( ethebo_opt( 'accent' ) );
	$accent = $accent ? $accent : '#2563eb';

	// Plain text.
	$text = $intro;
	if ( $rows ) {
		$text .= "\n\n" . ethebo_booking_summary( $b );
	}
	if ( $extra ) {
		$text .= "\n\n" . $extra;
	}
	if ( $button ) {
		$text .= "\n\n" . $button[1] . ': ' . $button[0];
	}
	$text .= "\n\n— \n" . $site . "\n" . home_url( '/' );

	// HTML (inline styles: email programs ignore <style>).
	$table = '';
	foreach ( $rows as $label => $value ) {
		$table .= '<tr><td style="padding:9px 0;color:#6b7280;font-size:14px;border-bottom:1px solid #f0f1f3;width:38%">' . esc_html( $label ) . '</td>'
			. '<td style="padding:9px 0;color:#111827;font-size:14px;font-weight:600;border-bottom:1px solid #f0f1f3;text-align:right">' . nl2br( esc_html( $value ) ) . '</td></tr>';
	}
	$html  = '<!doctype html><html><head><meta charset="utf-8"><meta name="viewport" content="width=device-width"></head>';
	$html .= '<body style="margin:0;padding:0;background:#f3f4f6;font-family:-apple-system,BlinkMacSystemFont,\'Segoe UI\',Roboto,Helvetica,Arial,sans-serif">';
	$html .= '<table role="presentation" width="100%" cellpadding="0" cellspacing="0" style="background:#f3f4f6;padding:24px 12px"><tr><td align="center">';
	$html .= '<table role="presentation" width="100%" cellpadding="0" cellspacing="0" style="max-width:560px;background:#ffffff;border-radius:14px;overflow:hidden">';
	$html .= '<tr><td style="background:' . esc_attr( $accent ) . ';padding:20px 28px;color:#ffffff;font-size:18px;font-weight:700">' . esc_html( $site ) . '</td></tr>';
	$html .= '<tr><td style="padding:28px">';
	$html .= '<div style="color:#111827;font-size:15px;line-height:1.6">' . nl2br( esc_html( $intro ) ) . '</div>';
	if ( $table ) {
		$html .= '<table role="presentation" width="100%" cellpadding="0" cellspacing="0" style="margin-top:20px;border-top:1px solid #f0f1f3">' . $table . '</table>';
	}
	if ( $extra ) {
		$html .= '<div style="margin-top:20px;padding:14px 16px;background:#f6f7f9;border-radius:10px;color:#111827;font-size:14px;line-height:1.6;font-family:Menlo,Consolas,monospace">' . nl2br( esc_html( $extra ) ) . '</div>';
	}
	if ( $button ) {
		$html .= '<p style="margin:24px 0 0"><a href="' . esc_url( $button[0] ) . '" style="display:inline-block;background:' . esc_attr( $accent ) . ';color:#ffffff;text-decoration:none;font-weight:600;font-size:14px;padding:12px 20px;border-radius:10px">' . esc_html( $button[1] ) . '</a></p>';
	}
	$html .= '</td></tr>';
	$html .= '<tr><td style="padding:16px 28px;background:#f9fafb;color:#9ca3af;font-size:12px;text-align:center"><a href="' . esc_url( home_url( '/' ) ) . '" style="color:#9ca3af">' . esc_html( wp_parse_url( home_url(), PHP_URL_HOST ) ) . '</a></td></tr>';
	$html .= '</table></td></tr></table></body></html>';

	$headers   = array( 'Content-Type: text/html; charset=UTF-8' );
	$from      = ethebo_opt( 'mail_from_email' );
	$from_name = trim( str_replace( array( ',', '"', '<', '>', "\r", "\n" ), '', (string) ( ethebo_opt( 'mail_from_name' ) ? ethebo_opt( 'mail_from_name' ) : $site ) ) );
	if ( is_email( $from ) ) {
		$headers[] = 'From: ' . $from_name . ' <' . $from . '>';
	}
	if ( $reply_to && is_email( $reply_to ) ) {
		$headers[] = 'Reply-To: ' . $reply_to;
	}

	// Plain-text version inside the same email (multipart/alternative).
	$alt = function ( $phpmailer ) use ( $text ) {
		$phpmailer->AltBody = $text;
	};
	add_action( 'phpmailer_init', $alt );
	// A broken mail setup (SMTP plugin, server) must never break the booking: the error goes to
	// "wp_mail_failed", where SMTP / mail log plugins record it, and the booking carries on.
	try {
		$sent = wp_mail( $to, $subject, $html, $headers );
	} catch ( \Throwable $e ) {
		$sent = false;
		do_action( 'wp_mail_failed', new WP_Error( 'ethebo_mail', $e->getMessage(), array( 'to' => (array) $to, 'subject' => $subject ) ) ); // phpcs:ignore WordPress.NamingConventions.PrefixAllGlobals.NonPrefixedHooknameFound -- WordPress core hook, read by mail log plugins.
	} finally {
		remove_action( 'phpmailer_init', $alt );
	}
	return $sent;
}

function ethebo_admin_email() {
	return is_email( ethebo_opt( 'admin_email' ) ) ? ethebo_opt( 'admin_email' ) : get_option( 'admin_email' );
}

/* -------------------------------------------------------------------------
 * Email templates (editable in Settings → Emails)
 * ---------------------------------------------------------------------- */

/** All emails with their default subject / message (in the plugin language, with placeholders). */
function ethebo_email_types() {
	$hello = sprintf( ethebo__( 'Hello %s,' ), '{guest_name}' ) . "\n\n";
	return array(
		'admin_new'       => array(
			'label'   => ethebo__( 'New booking (to you)' ),
			'subject' => str_replace( array( '%1$s', '%2$d', '%3$s' ), array( '{site_name}', '{booking_id}', '{property}' ), ethebo__( '[%1$s] New booking #%2$d – %3$s' ) ),
			'body'    => sprintf( ethebo__( 'You have a new booking (%s).' ), '{status}' ),
		),
		'guest_received'  => array(
			'label'   => ethebo__( 'Request received (to the guest)' ),
			'subject' => sprintf( ethebo__( '[%s] We received your booking request' ), '{site_name}' ),
			'body'    => $hello . ethebo__( 'Thank you! We received your request and will confirm it shortly.' ),
		),
		'guest_confirmed' => array(
			'label'   => ethebo__( 'Booking confirmed (to the guest)' ),
			'subject' => sprintf( ethebo__( '[%s] Your booking is confirmed' ), '{site_name}' ),
			'body'    => $hello . ethebo__( 'Your booking is confirmed. We look forward to welcoming you!' ),
		),
		'guest_paid'      => array(
			'label'   => ethebo__( 'Payment received (to the guest)' ),
			'subject' => sprintf( ethebo__( '[%s] We received your payment' ), '{site_name}' ),
			'body'    => $hello . ethebo__( 'Thank you, we received your payment. Your booking is confirmed.' ),
		),
		'guest_cancelled' => array(
			'label'   => ethebo__( 'Booking cancelled (to the guest)' ),
			'subject' => sprintf( ethebo__( '[%s] Your booking was cancelled' ), '{site_name}' ),
			'body'    => $hello . ethebo__( 'We are sorry, your booking was cancelled. If you have any questions, simply reply to this email.' ),
		),
	);
}

/** Placeholders usable in the templates. */
function ethebo_email_placeholders() {
	return array(
		'{guest_name}' => ethebo__( 'Guest name' ),
		'{booking_id}' => ethebo__( 'Booking number' ),
		'{property}'   => ethebo__( 'Property' ),
		'{check_in}'   => ethebo__( 'Check-in' ),
		'{check_out}'  => ethebo__( 'Check-out' ),
		'{nights}'     => ethebo__( 'Nights' ),
		'{guests}'     => ethebo__( 'Guests' ),
		'{total}'      => ethebo__( 'Total' ),
		'{payment}'    => ethebo__( 'Payment' ),
		'{status}'     => ethebo__( 'Status' ),
		'{site_name}'  => ethebo__( 'Website name' ),
		'{site_url}'   => ethebo__( 'Website address' ),
	);
}

function ethebo_email_vars( $b ) {
	return array(
		'{guest_name}' => $b->guest_name,
		'{booking_id}' => $b->id,
		'{property}'   => get_the_title( $b->property_id ),
		'{check_in}'   => ethebo_format_date( $b->check_in ),
		'{check_out}'  => ethebo_format_date( $b->check_out ),
		'{nights}'     => ethebo_nights( $b->check_in, $b->check_out ),
		'{guests}'     => $b->guests,
		'{total}'      => ethebo_price( $b->total ),
		'{payment}'    => $b->payment_method ? ETHEBO_Payments::label( $b->payment_method ) . ' – ' . ETHEBO_Payments::status_label( $b ) : '',
		'{status}'     => ethebo_statuses()[ $b->status ] ?? $b->status,
		'{site_name}'  => get_bloginfo( 'name' ),
		'{site_url}'   => home_url( '/' ),
	);
}

/**
 * [ subject, message ] of an email: the default text, or the owner's own template
 * (editable templates are added by Ethereal Booking Pro through the ethebo_email_template filter).
 */
function ethebo_email_content( $type, $b ) {
	$types   = ethebo_email_types();
	$tpl     = (array) apply_filters( 'ethebo_email_template', array( 'subject' => $types[ $type ]['subject'], 'body' => $types[ $type ]['body'] ), $type, $b );
	$subject = (string) ( $tpl['subject'] ?? $types[ $type ]['subject'] );
	$body    = (string) ( $tpl['body'] ?? $types[ $type ]['body'] );
	$vars    = array_map( 'strval', ethebo_email_vars( $b ) );
	return array( strtr( $subject, $vars ), strtr( $body, $vars ) );
}

function ethebo_notify_admin( $booking_id ) {
	$b = ETHEBO_Bookings::get( $booking_id );
	if ( ! $b ) {
		return;
	}
	list( $subject, $message ) = ethebo_email_content( 'admin_new', $b );
	ethebo_send_mail(
		ethebo_admin_email(),
		$subject,
		$message,
		$b,
		'',
		$b->guest_email,
		array( admin_url( 'edit.php?post_type=ethebo_property&page=ethebo-bookings' ), ethebo__( 'Manage bookings' ) )
	);
}

/** @param string $type received | confirmed | paid | cancelled */
function ethebo_notify_guest( $booking_id, $type ) {
	if ( ! ethebo_opt( 'guest_emails' ) ) {
		return;
	}
	$b = ETHEBO_Bookings::get( $booking_id );
	if ( ! $b || ! is_email( $b->guest_email ) ) {
		return;
	}
	$key = 'guest_' . ( in_array( $type, array( 'confirmed', 'paid', 'cancelled' ), true ) ? $type : 'received' );
	list( $subject, $message ) = ethebo_email_content( $key, $b );

	$extra = '';
	if ( 'bank' === $b->payment_method && 'paid' !== $b->payment_status && 'cancelled' !== $type && ethebo_opt( 'bank_details' ) ) {
		$extra = ethebo__( 'Bank transfer details:' ) . "\n" . ethebo_opt( 'bank_details' );
	}
	if ( 'arrival' === $b->payment_method && 'cancelled' !== $type && ethebo_opt( 'arrival_note' ) ) {
		$extra = ethebo_opt( 'arrival_note' );
	}
	ethebo_send_mail( $b->guest_email, $subject, $message, $b, $extra, ethebo_admin_email() );
}

/**
 * Test email from Settings: the "Booking confirmed" email with sample data,
 * so the owner sees the real design and text (and whether it lands in the Inbox).
 */
function ethebo_send_test_mail() {
	$ids    = get_posts( array( 'post_type' => ETHEBO_Post_Type::PT, 'numberposts' => 1, 'fields' => 'ids', 'post_status' => 'publish' ) );
	$sample = (object) array(
		'id'             => 1001,
		'property_id'    => $ids ? (int) $ids[0] : 0,
		'check_in'       => gmdate( 'Y-m-d', strtotime( '+14 days' ) ),
		'check_out'      => gmdate( 'Y-m-d', strtotime( '+17 days' ) ),
		'guests'         => 2,
		'total'          => 300,
		'status'         => 'confirmed',
		'guest_name'     => 'Arben Hoxha',
		'guest_email'    => 'guest@example.com',
		'guest_phone'    => '+355 69 000 0000',
		'notes'          => '',
		'payment_method' => '',
		'payment_status' => '',
		'paid_amount'    => 0,
	);
	list( $subject, $message ) = ethebo_email_content( 'guest_confirmed', $sample );
	return ethebo_send_mail(
		ethebo_admin_email(),
		'[' . ethebo__( 'Test email' ) . '] ' . $subject,
		ethebo__( 'If you can read this, booking emails work. Check that it arrived in the Inbox and not in Spam.' ) . "\n\n— — —\n\n" . $message,
		$sample
	);
}