<?php
/**
 * Away mode: the owner is on holiday.
 *
 * @package Dealroot
 */

namespace Dealroot;

defined( 'ABSPATH' ) || exit;

/**
 * "I am away until 15 November." Every person who writes in that time gets a confirmation that
 * says honestly when the answer comes, and, with the AI assistant, still asks for what is missing
 * for an offer. Reminders and the morning message rest. Back again, the owner sees the enquiries
 * of that time, those likely worth the most first.
 *
 * phpcs:disable WordPress.DB.DirectDatabaseQuery.DirectQuery, WordPress.DB.DirectDatabaseQuery.NoCaching
 */
class Away {

	const OPTION = 'dealroot_away';

	/**
	 * Days the list of enquiries stays on the overview after the return.
	 */
	const SHOW_DAYS = 7;

	/**
	 * Hooks.
	 */
	public function register() {
		add_action( 'dealroot_lead_created', array( __CLASS__, 'reply' ), 40 );
		add_action( 'admin_post_dealroot_away', array( $this, 'handle' ) );
		add_action( 'dealroot_overview_top', array( __CLASS__, 'panel' ) );
	}

	/**
	 * The away time: from, until (both Y-m-d in the time zone of the site) and a note.
	 *
	 * @return array{from: string, until: string, note: string}
	 */
	public static function get() {
		$away = get_option( self::OPTION, array() );

		return array(
			'from'  => (string) ( $away['from'] ?? '' ),
			'until' => (string) ( $away['until'] ?? '' ),
			'note'  => (string) ( $away['note'] ?? '' ),
		);
	}

	/**
	 * Whether the owner is away today.
	 *
	 * @return bool
	 */
	public static function active() {
		$away = self::get();

		return '' !== $away['until'] && $away['until'] >= wp_date( 'Y-m-d' ) && $away['from'] <= wp_date( 'Y-m-d' );
	}

	/**
	 * The last day away, as people read it, e.g. "15 November 2026".
	 *
	 * @return string
	 */
	public static function until_text() {
		$until = date_create_immutable( self::get()['until'] . ' 12:00', wp_timezone() );

		return $until ? wp_date( get_option( 'date_format' ), $until->getTimestamp() ) : '';
	}

	/**
	 * Starts or ends the away time.
	 *
	 * @param string $until Last day away, Y-m-d, or "" to end it.
	 * @param string $note  What people should know, e.g. who stands in, optional.
	 * @return bool
	 */
	public static function set( $until, $note = '' ) {
		if ( '' === $until ) {
			$away = self::get();
			// The list of what came in stays for a few days.
			$away['until'] = $away['from'] && $away['until'] > wp_date( 'Y-m-d' ) ? wp_date( 'Y-m-d', time() - DAY_IN_SECONDS ) : $away['until'];

			return update_option( self::OPTION, $away, false );
		}

		if ( ! preg_match( '/^\d{4}-\d{2}-\d{2}$/', $until ) || $until < wp_date( 'Y-m-d' ) ) {
			return false;
		}

		return update_option(
			self::OPTION,
			array(
				'from'  => wp_date( 'Y-m-d' ),
				'until' => $until,
				'note'  => mb_substr( sanitize_textarea_field( $note ), 0, 300 ),
			),
			false
		);
	}

	/**
	 * Without the AI assistant, a short confirmation of its own; with it, the assistant writes it
	 * and says when the answer comes.
	 *
	 * @param int $lead_id Lead ID.
	 */
	public static function reply( $lead_id ) {
		if ( ! self::active() || Ai::enabled() ) {
			return;
		}

		$lead = Leads::get( (int) $lead_id );

		if ( ! $lead || 'new' !== $lead->status || in_array( $lead->form_plugin, array( 'manual', 'woocommerce', 'order' ), true ) || ! is_email( $lead->email ) ) {
			return;
		}

		// One answer a day per address, so a form sent twice gets one.
		if ( get_transient( 'dealroot_away_' . md5( strtolower( $lead->email ) ) ) ) {
			return;
		}

		set_transient( 'dealroot_away_' . md5( strtolower( $lead->email ) ), 1, DAY_IN_SECONDS );

		$business = Ai::business();
		$note     = self::get()['note'];
		$body     = sprintf(
			/* translators: 1: date, 2: name of the business */
			__( "Thank you for your message. We are away until %1\$s and will answer you personally after that.\n\nKind regards\n%2\$s", 'dealroot' ),
			self::until_text(),
			$business
		);

		if ( '' !== $note ) {
			$body = str_replace( "\n\n", "\n\n" . $note . "\n\n", $body );
		}

		/* translators: %s: name of the business */
		Ai::mail( $lead->email, sprintf( __( 'Your message to %s', 'dealroot' ), $business ), $body, true );
	}

	/**
	 * Enquiries that came while the owner was away and still wait, those likely worth the most first.
	 *
	 * @return object[]
	 */
	public static function waiting() {
		global $wpdb;

		$away = self::get();

		if ( '' === $away['from'] ) {
			return array();
		}

		$from  = date_create_immutable( $away['from'] . ' 00:00', wp_timezone() );
		$leads = (array) $wpdb->get_results(
			$wpdb->prepare(
				"SELECT * FROM %i WHERE status = 'new' AND form_plugin NOT IN ('manual', 'woocommerce') AND ai_kind NOT IN ('spam', 'job') AND created_at >= %s ORDER BY created_at DESC LIMIT 100",
				Installer::table(),
				gmdate( 'Y-m-d H:i:s', $from ? $from->getTimestamp() : time() )
			)
		);

		foreach ( $leads as $lead ) {
			$worth = null !== $lead->ai_budget ? (float) $lead->ai_budget : ( null !== $lead->value ? (float) $lead->value : 0.0 );

			/**
			 * Filters what a lead is likely worth, e.g. with the expected value of Dealroot Pro.
			 *
			 * @param float  $worth Amount in the currency of the site.
			 * @param object $lead  Lead.
			 */
			$lead->worth = (float) apply_filters( 'dealroot_lead_worth', $worth, $lead );
		}

		usort(
			$leads,
			static function ( $a, $b ) {
				$order = $b->worth <=> $a->worth;

				return 0 !== $order ? $order : strcmp( $a->created_at, $b->created_at );
			}
		);

		return $leads;
	}

	/**
	 * On the overview: while away, that the mode is on; back again, what came in.
	 */
	public static function panel() {
		$away = self::get();

		if ( '' === $away['until'] ) {
			return;
		}

		$active = self::active();
		$back   = ! $active && $away['until'] < wp_date( 'Y-m-d' ) && $away['until'] >= wp_date( 'Y-m-d', time() - self::SHOW_DAYS * DAY_IN_SECONDS );

		if ( ! $active && ! $back ) {
			return;
		}

		$leads    = self::waiting();
		$currency = (string) Settings::get( 'currency' );
		?>
		<section class="dealroot-panel dealroot-away" aria-labelledby="dealroot-away-title">
			<h2 id="dealroot-away-title">
				<?php
				echo esc_html(
					$active
						/* translators: %s: date */
						? sprintf( __( 'You are away until %s', 'dealroot' ), self::until_text() )
						: __( 'Welcome back – this came in while you were away', 'dealroot' )
				);
				?>
			</h2>
			<?php if ( $active ) : ?>
				<p><?php esc_html_e( 'Everyone who writes gets a confirmation that says when you answer, and is asked for what is missing for your offer. Reminders and the morning message rest.', 'dealroot' ); ?></p>
				<form method="post" action="<?php echo esc_url( admin_url( 'admin-post.php' ) ); ?>">
					<input type="hidden" name="action" value="dealroot_away">
					<input type="hidden" name="until" value="">
					<?php wp_nonce_field( 'dealroot_away' ); ?>
					<button type="submit" class="dealroot-button"><?php esc_html_e( 'I am back', 'dealroot' ); ?></button>
				</form>
			<?php endif; ?>
			<?php if ( $leads ) : ?>
				<p class="dealroot-muted">
					<?php
					echo esc_html(
						sprintf(
							/* translators: %s: number of enquiries */
							_n( '%s enquiry waits for your answer, those likely worth the most first:', '%s enquiries wait for your answer, those likely worth the most first:', count( $leads ), 'dealroot' ),
							number_format_i18n( count( $leads ) )
						)
					);
					?>
				</p>
				<ol class="dealroot-away__list">
					<?php foreach ( array_slice( $leads, 0, 10 ) as $lead ) : ?>
						<li>
							<a href="<?php echo esc_url( Admin\Shell::url( Admin\Admin::PAGE, array( 'lead' => (int) $lead->id ) ) ); ?>"><?php echo esc_html( '' !== trim( (string) $lead->name ) ? $lead->name : $lead->email ); ?></a>
							<span><?php echo esc_html( wp_html_excerpt( (string) ( '' !== (string) $lead->ai_summary ? $lead->ai_summary : $lead->form_name ), 90, '…' ) ); ?></span>
							<?php if ( $lead->worth > 0 ) : ?>
								<strong><?php echo esc_html( Admin\Format::money( $lead->worth, $currency ) ); ?></strong>
							<?php endif; ?>
						</li>
					<?php endforeach; ?>
				</ol>
			<?php endif; ?>
		</section>
		<?php
	}

	/**
	 * Starts or ends the away time from the settings or the overview.
	 */
	public function handle() {
		check_admin_referer( 'dealroot_away' );

		if ( ! current_user_can( Admin\Admin::capability() ) ) {
			wp_die( esc_html__( 'You are not allowed to do this.', 'dealroot' ), 403 );
		}

		$until = isset( $_POST['until'] ) ? sanitize_text_field( wp_unslash( $_POST['until'] ) ) : '';
		$note  = isset( $_POST['note'] ) ? sanitize_textarea_field( wp_unslash( $_POST['note'] ) ) : '';

		self::set( $until, $note );

		wp_safe_redirect( wp_get_referer() ? wp_get_referer() : admin_url( 'admin.php?page=dealroot' ) );
		exit;
	}

	/**
	 * The fields to go away, inside the settings form.
	 */
	public static function fields() {
		$away = self::get();
		$name = Settings::OPTION;

		if ( self::active() ) {
			?>
			<p>
				<?php
				/* translators: %s: date */
				echo esc_html( sprintf( __( 'You are away until %s.', 'dealroot' ), self::until_text() ) );
				?>
			</p>
			<p><label><input type="checkbox" name="<?php echo esc_attr( $name ); ?>[away_back]" value="1"> <?php esc_html_e( 'I am back', 'dealroot' ); ?></label></p>
			<?php
			return;
		}
		?>
		<p>
			<label for="dealroot-away-until"><?php esc_html_e( 'Away until and including', 'dealroot' ); ?></label><br>
			<input type="date" id="dealroot-away-until" name="<?php echo esc_attr( $name ); ?>[away_until]" min="<?php echo esc_attr( wp_date( 'Y-m-d' ) ); ?>">
		</p>
		<p>
			<label for="dealroot-away-note"><?php esc_html_e( 'Note for people who write, optional', 'dealroot' ); ?></label><br>
			<textarea id="dealroot-away-note" name="<?php echo esc_attr( $name ); ?>[away_note]" rows="2" class="large-text" maxlength="300" placeholder="<?php esc_attr_e( 'e.g. In urgent cases, call Ms Berger on 0511 123456.', 'dealroot' ); ?>"><?php echo esc_textarea( $away['note'] ); ?></textarea>
		</p>
		<p class="description"><?php esc_html_e( 'Everyone who writes in that time gets a confirmation that says when you answer; with the AI assistant, it also asks for what is missing for your offer. Reminders and the morning message rest. Back again, the overview shows what came in, the enquiries likely worth the most first.', 'dealroot' ); ?></p>
		<?php
	}

	/**
	 * Takes the away fields from the posted settings.
	 *
	 * @param array $input Posted settings.
	 */
	public static function from_settings( array $input ) {
		if ( ! empty( $input['away_back'] ) ) {
			self::set( '' );
		} elseif ( ! empty( $input['away_until'] ) ) {
			self::set( sanitize_text_field( (string) $input['away_until'] ), (string) ( $input['away_note'] ?? '' ) );
		}
	}
}