<?php
/**
 * Statutory withdrawal on or off (N-80, 04 §8).
 *
 * @package Careback
 */

namespace Careback;

defined( 'ABSPATH' ) || exit;

/**
 * The switch of statutory withdrawal on Settings: the two radio buttons, the
 * confirmation a shop gives before switching it off, the saved states and the
 * notices; and what Setup says about it.
 *
 * On for every install. Off, the customer's one action is the voluntary return
 * (Routes), nothing filed is recorded as a statutory withdrawal (Submission,
 * the manual entry), and requests already filed keep their type and dates.
 * Switching it off takes the confirmation; switching it on again does not.
 * Which countries the store sells to is read from WooCommerce's selling
 * locations, only to say so: nothing switches by itself.
 */
class Withdrawal_Switch {

	/** Countries of the EEA outside the EU, beside WooCommerce's list of the EU. */
	const EEA_EXTRA = array( 'IS', 'LI', 'NO' );

	/** Id of the switch on Settings: the target of the links to it. */
	const ANCHOR = 'careback-withdrawal-switch';

	/** The query argument the settings form answers with: on, off or unconfirmed. */
	const RESULT_ARG = 'careback_withdrawal';

	/**
	 * The countries of the EU and the EEA.
	 *
	 * @return string[]
	 */
	public static function eea_countries() {
		$eu = function_exists( 'WC' ) && WC()->countries ? (array) WC()->countries->get_european_union_countries() : array();

		return array_values( array_unique( array_merge( array_map( 'strval', $eu ), self::EEA_EXTRA ) ) );
	}

	/**
	 * True when WooCommerce's selling locations take in a country of the EU or the EEA.
	 *
	 * @return bool
	 */
	public static function sells_to_eea() {
		if ( ! function_exists( 'WC' ) || ! WC()->countries ) {
			return false;
		}

		return array() !== array_intersect( array_keys( (array) WC()->countries->get_allowed_countries() ), self::eea_countries() );
	}

	/**
	 * WooCommerce's selling locations in a few words: all countries, all but
	 * some, or specific countries.
	 *
	 * @return string
	 */
	public static function selling_label() {
		$allowed = (string) get_option( 'woocommerce_allowed_countries', 'all' );

		if ( 'specific' === $allowed ) {
			return __( 'specific countries', 'careback' );
		}

		if ( 'all_except' === $allowed ) {
			return __( 'all countries, except some', 'careback' );
		}

		return __( 'all countries', 'careback' );
	}

	/**
	 * Withdrawals still being worked on: the open statuses, the withdrawal type.
	 *
	 * @param Requests_Repository $requests The requests table.
	 * @return int
	 */
	public static function open_withdrawals( Requests_Repository $requests ) {
		return (int) $requests->count( Statuses::open(), '', array( 'withdrawal' ) );
	}

	/**
	 * The request list narrowed to the open withdrawals.
	 *
	 * @return string
	 */
	public static function open_withdrawals_url() {
		$query = 'admin.php?page=careback&type[]=withdrawal';

		foreach ( Statuses::open() as $status ) {
			$query .= '&status[]=' . rawurlencode( (string) $status );
		}

		return admin_url( $query );
	}

	/**
	 * The day it was switched off, in the site's date format, or ''.
	 *
	 * @param Settings $settings Plugin settings.
	 * @return string
	 */
	public static function off_since( Settings $settings ) {
		$at = (int) $settings->get( 'withdrawal_off_at', 0 );

		return $at > 0 ? (string) wp_date( (string) get_option( 'date_format' ), $at ) : '';
	}

	/**
	 * What the settings form asks of the switch: the values to store and the
	 * result the redirect carries ('' when nothing changed). Off is stored only
	 * with the confirmation; On always. A form that sends no switch changes
	 * nothing. The caller checked the nonce and the capability.
	 *
	 * @param Settings $settings Settings as stored.
	 * @param array    $posted   The posted form (Admin::save()).
	 * @return array{0:array,1:string}
	 */
	public static function from_post( Settings $settings, array $posted ) {
		if ( ! isset( $posted['withdrawal_enabled'] ) || ! is_scalar( $posted['withdrawal_enabled'] ) ) {
			return array( array(), '' );
		}

		$want_on = '0' !== sanitize_key( $posted['withdrawal_enabled'] );
		$confirm = ! empty( $posted['withdrawal_off_confirm'] );

		$is_on = Routes::withdrawal_offered( $settings );

		if ( $want_on ) {
			return $is_on ? array( array(), '' ) : array(
				array(
					'withdrawal_enabled' => 1,
					'withdrawal_off_at'  => 0,
					'withdrawal_off_by'  => 0,
				),
				'on',
			);
		}

		if ( ! $is_on ) {
			return array( array(), '' );
		}

		if ( ! $confirm ) {
			return array( array(), 'unconfirmed' );
		}

		return array(
			array(
				'withdrawal_enabled' => 0,
				'withdrawal_off_at'  => time(),
				'withdrawal_off_by'  => get_current_user_id(),
			),
			'off',
		);
	}

	/**
	 * The notice at the top of Settings after a save: the switch's result, or
	 * "Settings saved." alone.
	 *
	 * @return void
	 */
	public static function saved_notice() {
		// phpcs:disable WordPress.Security.NonceVerification.Recommended -- a notice after the redirect; nothing is changed.
		if ( ! isset( $_GET['updated'] ) ) {
			return;
		}

		$result = isset( $_GET[ self::RESULT_ARG ] ) ? sanitize_key( wp_unslash( $_GET[ self::RESULT_ARG ] ) ) : '';
		// phpcs:enable WordPress.Security.NonceVerification.Recommended

		if ( 'unconfirmed' === $result ) {
			printf(
				'<div class="notice notice-error"><p>%1$s <strong>%2$s</strong> %3$s <a href="#%4$s">%5$s</a></p></div>',
				esc_html__( 'Settings saved, except one:', 'careback' ),
				esc_html__( 'statutory withdrawal is still on.', 'careback' ),
				esc_html__( 'To switch it off, tick the confirmation below and save again.', 'careback' ),
				esc_attr( self::ANCHOR ),
				esc_html__( 'Go to the setting', 'careback' )
			);
			return;
		}

		if ( 'off' === $result ) {
			$text = __( 'Settings saved. Statutory withdrawal is off: the form offers only your voluntary return.', 'careback' );
		} elseif ( 'on' === $result ) {
			$text = __( 'Settings saved. Statutory withdrawal is on: the form offers it again from now on.', 'careback' );
		} else {
			$text = __( 'Settings saved.', 'careback' );
		}

		printf( '<div class="notice notice-success is-dismissible"><p>%s</p></div>', esc_html( $text ) );
	}

	/**
	 * The row of the switch on Settings: the two radio buttons in a fieldset;
	 * while it is on, the confirmation under them — printed for a browser
	 * without JavaScript too, read only when Off is sent; while it is off, since
	 * when and by whom, and the withdrawals filed before that are still open.
	 *
	 * @param Settings            $settings Settings the screen prints.
	 * @param Requests_Repository $requests The requests table.
	 * @return void
	 */
	public static function render_row( Settings $settings, Requests_Repository $requests ) {
		// phpcs:ignore WordPress.Security.NonceVerification.Recommended -- the result of the redirect; nothing is changed.
		$unconfirmed = isset( $_GET[ self::RESULT_ARG ] ) && 'unconfirmed' === sanitize_key( wp_unslash( $_GET[ self::RESULT_ARG ] ) );
		$on          = Routes::withdrawal_offered( $settings );
		$days        = (int) $settings->get( 'return_window_days', 30 );
		?>
		<tr class="careback-withdrawal-row">
			<th scope="row"><?php esc_html_e( 'Statutory withdrawal', 'careback' ); ?></th>
			<td>
				<fieldset id="<?php echo esc_attr( self::ANCHOR ); ?>" class="careback-radio-list" tabindex="-1">
					<legend class="screen-reader-text"><?php esc_html_e( 'Statutory withdrawal', 'careback' ); ?></legend>
					<label><input type="radio" name="withdrawal_enabled" value="1" <?php checked( $on && ! $unconfirmed ); ?> /> <strong><?php esc_html_e( 'On', 'careback' ); ?></strong> — <?php esc_html_e( 'customers can withdraw from a purchase within the period, without giving a reason', 'careback' ); ?></label>
					<label><input type="radio" name="withdrawal_enabled" value="0" <?php checked( ! $on || $unconfirmed ); ?> /> <strong><?php esc_html_e( 'Off', 'careback' ); ?></strong> — <?php esc_html_e( 'customers can only return items under your return rules', 'careback' ); ?></label>
				</fieldset>
				<?php if ( $on ) : ?>
					<div class="careback-panel<?php echo $unconfirmed ? ' is-error' : ''; ?>" id="careback-withdrawal-confirm" role="group" aria-labelledby="careback-withdrawal-confirm-title" data-careback-confirm="<?php echo $unconfirmed ? 'error' : 'on'; ?>">
						<p class="careback-panel-title" id="careback-withdrawal-confirm-title"><strong><?php esc_html_e( 'Before you switch it off', 'careback' ); ?></strong></p>
						<p><?php esc_html_e( 'When you save:', 'careback' ); ?></p>
						<ul class="careback-list-plain">
							<li>
								<?php
								echo esc_html(
									sprintf(
										/* translators: %d: the shop's return period in days. */
										_n( 'The form offers only your voluntary return, from delivery until the end of your return period (%d day).', 'The form offers only your voluntary return, from delivery until the end of your return period (%d days).', $days, 'careback' ),
										$days
									)
								);
								?>
							</li>
							<li><?php esc_html_e( 'Texts about the statutory right of withdrawal, the model withdrawal form and the legal guarantee notice are no longer shown to customers.', 'careback' ); ?></li>
							<li><?php esc_html_e( 'Requests already filed keep their type and dates.', 'careback' ); ?></li>
						</ul>
						<?php if ( self::sells_to_eea() ) : ?>
							<p>
								<strong><?php esc_html_e( 'Your store sells to EU or EEA countries', 'careback' ); ?></strong>
								<?php esc_html_e( '(WooCommerce → Settings → General → Selling location(s)). Consumers there have a right of withdrawal for most online purchases.', 'careback' ); ?>
							</p>
						<?php endif; ?>
						<label class="careback-confirm-box"><input type="checkbox" name="withdrawal_off_confirm" value="1"<?php echo $unconfirmed ? ' aria-invalid="true" aria-describedby="careback-withdrawal-confirm-error"' : ''; ?> /> <?php esc_html_e( 'I have checked that my customers have no statutory right of withdrawal.', 'careback' ); ?></label>
						<?php if ( $unconfirmed ) : ?>
							<span class="careback-field-error" id="careback-withdrawal-confirm-error" role="alert"><?php esc_html_e( 'Tick this box to switch statutory withdrawal off. It is still on.', 'careback' ); ?></span>
						<?php endif; ?>
					</div>
				<?php else : ?>
					<p class="careback-withdrawal-state">
						<span class="careback-state is-off"><?php esc_html_e( 'Off', 'careback' ); ?></span>
						<?php echo esc_html( self::off_line( $settings ) ); ?>
					</p>
					<?php $open = self::open_withdrawals( $requests ); ?>
					<?php if ( $open > 0 ) : ?>
						<p class="description">
							<?php
							echo esc_html(
								sprintf(
									/* translators: %d: number of withdrawals still open. */
									_n( '%d withdrawal filed before then is still open. It keeps its dates.', '%d withdrawals filed before then are still open. They keep their dates.', $open, 'careback' ),
									$open
								)
							);
							?>
							<a href="<?php echo esc_url( self::open_withdrawals_url() ); ?>"><?php esc_html_e( 'View them', 'careback' ); ?></a>
						</p>
					<?php endif; ?>
				<?php endif; ?>
			</td>
		</tr>
		<?php
	}

	/**
	 * Since when it is off and who switched it off, as Settings says it.
	 *
	 * @param Settings $settings Plugin settings.
	 * @return string
	 */
	private static function off_line( Settings $settings ) {
		$since = self::off_since( $settings );
		$user  = get_userdata( (int) $settings->get( 'withdrawal_off_by', 0 ) );

		if ( '' !== $since && $user ) {
			// One sentence of its own after the "Off" badge, so no language has to continue the badge.
			/* translators: 1: date it was switched off, 2: name of the user who switched it off. */
			return sprintf( __( 'Switched off on %1$s by %2$s. Customers see only your voluntary return.', 'careback' ), $since, $user->display_name );
		}

		if ( '' !== $since ) {
			/* translators: %s: date it was switched off. */
			return sprintf( __( 'Switched off on %s. Customers see only your voluntary return.', 'careback' ), $since );
		}

		return __( 'Customers see only your voluntary return.', 'careback' );
	}
}