<?php
/**
 * The preview of one advert: what would be sent, what is wrong, and which photos go out.
 * Rendered as an HTML fragment for the preview dialog on the Listings screen.
 *
 * @package Tidelist
 */

namespace Tidelist\Admin;

use Tidelist\Build\BuildResult;
use Tidelist\Media\PhotoPaths;
use Tidelist\Plugin;
use Tidelist\Support\Text;

/**
 * Advert preview.
 */
final class ListingPreview {

	/**
	 * Plugin.
	 *
	 * @var Plugin
	 */
	private $plugin;

	/**
	 * Constructor.
	 *
	 * @param Plugin $plugin Plugin.
	 */
	public function __construct( Plugin $plugin ) {
		$this->plugin = $plugin;
	}

	/**
	 * Translated text for a builder message.
	 *
	 * @param array  $message       [code, text].
	 * @param string $channel_label Marketplace name.
	 */
	public static function message_text( array $message, string $channel_label ): string {
		$texts = array(
			'no_category'           => Text::channel( __( 'Not mapped: this product has no {channel} category. Set it in the category mapping.', 'tidelist' ), $channel_label ),
			'category_not_leaf'     => Text::channel( __( '{channel} only takes adverts in the last level of its categories. Choose a more specific category.', 'tidelist' ), $channel_label ),
			'attribute_missing'     => Text::channel( __( 'A required {channel} field has no value. See the attribute mapping.', 'tidelist' ), $channel_label ),
			'attribute_unmapped'    => Text::channel( __( 'A value is not in the list {channel} offers. Map it in the attribute mapping.', 'tidelist' ), $channel_label ),
			'category_ambiguous'    => Text::channel( __( 'The shop categories of this product lead to more than one {channel} category, so one was picked. Check that it is the right one.', 'tidelist' ), $channel_label ),
			'attribute_many'        => Text::channel( __( '{channel} takes only one value for a field. The first one was used.', 'tidelist' ), $channel_label ),
			'no_attribute_data'     => Text::channel( __( 'The attributes of this {channel} category could not be read, so none are sent.', 'tidelist' ), $channel_label ),
			'out_of_stock'          => __( 'This product is out of stock, so it cannot be advertised. Put it back in stock in the shop first.', 'tidelist' ),
			'not_for_sale'          => __( 'This product is not published in the shop, so it cannot be advertised.', 'tidelist' ),
			'no_price'              => __( 'The product has no price.', 'tidelist' ),
			'no_photos'             => __( 'The product has no photos.', 'tidelist' ),
			'photos_from_parent'    => __( 'This variation has no own photos. The product photos are used and may show other options.', 'tidelist' ),
			'photo_convert_failed'  => __( 'A JPG copy of a .webp photo could not be made. Untick that photo.', 'tidelist' ),
			'photo_copy_not_public' => Text::channel( __( 'The JPG copies of .webp photos can only be downloaded by {channel} after the plugin is installed on the live site. Until then this advert cannot be published.', 'tidelist' ), $channel_label ),
			'contacts_removed'      => __( 'A web address, e-mail or phone number was removed from the product text.', 'tidelist' ),
			'no_contact'            => __( 'Contact name is not set (Settings).', 'tidelist' ),
		);
		$text  = $texts[ $message['code'] ] ?? $message['text'];
		// Say which field it is: the generic sentence alone leaves the owner guessing.
		$args = isset( $message['args'] ) && is_array( $message['args'] ) ? array_values( $message['args'] ) : array();
		if ( 'category_ambiguous' === $message['code'] && isset( $args[0], $args[1] ) ) {
			/* translators: 1: the category that was picked, 2: the other possible categories */
			$text .= ' ' . sprintf( __( 'Picked: %1$s. Also possible: %2$s.', 'tidelist' ), (string) $args[0], (string) $args[1] );
		} elseif ( 'attribute_missing' === $message['code'] && isset( $args[0] ) ) {
			/* translators: %s: name of the marketplace field */
			$text .= ' ' . sprintf( __( 'Field: "%s".', 'tidelist' ), (string) $args[0] );
		} elseif ( 'attribute_unmapped' === $message['code'] && isset( $args[0], $args[1] ) ) {
			/* translators: 1: name of the marketplace field, 2: the shop value */
			$text .= ' ' . sprintf( __( 'Field: "%1$s", value: "%2$s".', 'tidelist' ), (string) $args[0], (string) $args[1] );
		}
		return $text;
	}

	/**
	 * The preview as HTML.
	 *
	 * @param int      $product_id   Product ID.
	 * @param int|null $variation_id Variation ID.
	 */
	public function html( int $product_id, ?int $variation_id ): string {
		$channel       = $this->plugin->channel();
		$channel_label = $channel->label();
		$result        = $this->plugin->build_listing( $product_id, $variation_id );
		ob_start();
		if ( null === $result ) {
			echo '<p>' . esc_html__( 'This product no longer exists.', 'tidelist' ) . '</p>';
			return (string) ob_get_clean();
		}
		$listing = $result->listing;
		$body    = null === $listing ? array() : $channel->request_body( $listing );
		?>
		<h2 style="margin-top:0;"><?php echo esc_html( null === $listing ? '' : $listing->title ); ?></h2>
		<?php $this->messages( $result, $channel_label ); ?>
		<table class="widefat striped" style="max-width:900px;">
			<tbody>
				<tr><th style="width:180px;"><?php esc_html_e( 'Price', 'tidelist' ); ?></th><td>
					<?php
					$price_info = (float) ( $result->info['shop_price'] ?? 0 );
					$sent       = null === $listing ? 0.0 : $listing->price;
					echo esc_html( number_format_i18n( $sent, 2 ) . ' ' . (string) ( $result->info['currency'] ?? '' ) );
					if ( abs( $price_info - $sent ) > 0.001 ) {
						echo ' <small>' . esc_html( sprintf( /* translators: %s: converted shop price */ __( '(price rule applied; converted shop price %s)', 'tidelist' ), number_format_i18n( $price_info, 2 ) ) ) . '</small>';
					}
					?>
				</td></tr>
				<tr><th><?php echo esc_html( Text::channel( __( '{channel} category', 'tidelist' ), $channel_label ) ); ?></th><td><?php echo esc_html( '' !== (string) ( $result->info['category'] ?? '' ) ? (string) $result->info['category'] : '—' ); ?></td></tr>
				<tr><th><?php echo esc_html( Text::channel( __( '{channel} fields', 'tidelist' ), $channel_label ) ); ?></th><td><code><?php echo esc_html( $this->attributes_text( null === $listing ? array() : $listing->attributes ) ); ?></code></td></tr>
				<tr><th><?php esc_html_e( 'Contact', 'tidelist' ); ?></th><td><?php echo esc_html( implode( ' · ', array_filter( array_merge( null === $listing ? array() : $listing->contact, array( (string) ( $result->info['location'] ?? '' ) ) ) ) ) ); ?></td></tr>
			</tbody>
		</table>

		<?php $this->category_form( $product_id, $variation_id, $channel_label ); ?>

		<h3><?php esc_html_e( 'Description', 'tidelist' ); ?></h3>
		<pre style="white-space:pre-wrap;max-width:900px;background:#fff;border:1px solid #c3c4c7;padding:12px;"><?php echo esc_html( null === $listing ? '' : $listing->description ); ?></pre>

		<h3><?php esc_html_e( 'Photos', 'tidelist' ); ?></h3>
		<?php $this->photos( $result, null === $listing ? array() : $listing->images, $product_id, $variation_id ); ?>

		<details style="margin-top:12px;">
			<summary><?php echo esc_html( Text::channel( __( 'Exact data sent to {channel} (JSON)', 'tidelist' ), $channel_label ) ); ?></summary>
			<pre style="white-space:pre-wrap;max-width:900px;background:#f6f7f7;border:1px solid #c3c4c7;padding:12px;max-height:400px;overflow:auto;"><?php echo esc_html( (string) wp_json_encode( $body, JSON_PRETTY_PRINT | JSON_UNESCAPED_UNICODE | JSON_UNESCAPED_SLASHES ) ); ?></pre>
		</details>
		<?php
		return (string) ob_get_clean();
	}

	/**
	 * Choose another marketplace category for this product only.
	 *
	 * @param int      $product_id    Product ID.
	 * @param int|null $variation_id  Variation ID.
	 * @param string   $channel_label Marketplace name.
	 */
	private function category_form( int $product_id, ?int $variation_id, string $channel_label ): void {
		$chosen  = $this->plugin->category_override_of( $product_id );
		$product = wc_get_product( $product_id );
		$title   = $product ? wp_strip_all_tags( $product->get_name() ) : '';
		?>
		<h3><?php echo esc_html( Text::channel( __( 'Change the {channel} category of this product', 'tidelist' ), $channel_label ) ); ?></h3>
		<form method="post" action="<?php echo esc_url( admin_url( 'admin-post.php' ) ); ?>" data-none="<?php echo esc_attr( __( 'No category found. Try other words.', 'tidelist' ) ); ?>" style="max-width:900px;margin-bottom:8px;">
			<input type="hidden" name="action" value="<?php echo esc_attr( ListingActions::PRODUCT_CATEGORY ); ?>" />
			<input type="hidden" name="item" value="<?php echo esc_attr( $product_id . ':' . (int) $variation_id ); ?>" />
			<?php wp_nonce_field( ListingActions::PRODUCT_CATEGORY ); ?>
			<p class="description">
				<?php
				echo esc_html(
					$chosen > 0
						? Text::channel( __( 'This category was chosen for this product. The category mapping is not used for it.', 'tidelist' ), $channel_label )
						: Text::channel( __( 'The category comes from the category mapping. Search for another {channel} category to use for this product only.', 'tidelist' ), $channel_label )
				);
				?>
			</p>
			<p>
				<input type="search" class="regular-text" autocomplete="off" data-tidelist-cat-search placeholder="<?php echo esc_attr( __( 'Search categories, for example: men jackets', 'tidelist' ) ); ?>" />
				<?php if ( '' !== $title ) : ?>
					<button type="button" class="button" data-tidelist-cat-suggest data-title="<?php echo esc_attr( $title ); ?>"><?php echo esc_html( Text::channel( __( 'Suggest from the product title', 'tidelist' ), $channel_label ) ); ?></button>
				<?php endif; ?>
			</p>
			<ul data-tidelist-cat-results style="margin:0 0 8px;"></ul>
			<input type="hidden" name="category" value="" data-tidelist-cat-value />
			<p>
				<button type="submit" class="button button-primary" data-tidelist-cat-save disabled><?php esc_html_e( 'Use this category', 'tidelist' ); ?></button>
				<?php if ( $chosen > 0 ) : ?>
					<button type="submit" name="clear" value="1" class="button"><?php esc_html_e( 'Back to the category mapping', 'tidelist' ); ?></button>
				<?php endif; ?>
			</p>
		</form>
		<?php
	}

	/**
	 * Errors and warnings.
	 *
	 * @param BuildResult $result        Result.
	 * @param string      $channel_label Marketplace name.
	 */
	private function messages( BuildResult $result, string $channel_label ): void {
		foreach ( $result->errors as $message ) {
			echo '<div class="notice notice-error inline"><p><strong>' . esc_html__( 'Fix before publishing:', 'tidelist' ) . '</strong> ' . esc_html( self::message_text( $message, $channel_label ) ) . '</p></div>';
		}
		foreach ( $result->warnings as $message ) {
			echo '<div class="notice notice-warning inline"><p>' . esc_html( self::message_text( $message, $channel_label ) ) . '</p></div>';
		}
		if ( ! $result->errors && ! $result->warnings ) {
			echo '<div class="notice notice-success inline"><p>' . esc_html__( 'Ready: no errors or warnings.', 'tidelist' ) . '</p></div>';
		}
	}

	/**
	 * Photo picker.
	 *
	 * @param BuildResult $result       Result.
	 * @param string[]    $sent         Photo addresses that are sent.
	 * @param int         $product_id   Product ID.
	 * @param int|null    $variation_id Variation ID.
	 */
	private function photos( BuildResult $result, array $sent, int $product_id, ?int $variation_id ): void {
		$image_base = (string) $this->plugin->settings()->get( 'image_base_url' );
		$base_url   = rtrim( $image_base, '/' ) . '/wp-content/uploads/';
		$all        = array_values( array_filter( explode( "\n", (string) ( $result->info['all_photos'] ?? '' ) ) ) );
		?>
		<form method="post" action="<?php echo esc_url( admin_url( 'admin-post.php' ) ); ?>">
			<input type="hidden" name="action" value="<?php echo esc_attr( ListingActions::PHOTOS ); ?>" />
			<input type="hidden" name="item" value="<?php echo esc_attr( $product_id . ':' . (int) $variation_id ); ?>" />
			<?php wp_nonce_field( ListingActions::PHOTOS ); ?>
			<div style="display:flex;flex-wrap:wrap;gap:8px;">
				<?php foreach ( $all as $i => $path ) : ?>
					<?php
					$url      = $base_url . implode( '/', array_map( 'rawurlencode', explode( '/', ltrim( $path, '/' ) ) ) );
					$sent_url = PhotoPaths::url( $image_base, $path );
					$used     = in_array( $sent_url, $sent, true );
					?>
					<figure style="margin:0;width:130px;text-align:center;<?php echo $used ? '' : 'opacity:.45;'; ?>">
						<a href="<?php echo esc_url( $url ); ?>" target="_blank" rel="noopener noreferrer"><img src="<?php echo esc_url( $url ); ?>" alt="" style="width:130px;height:130px;object-fit:cover;border:1px solid #c3c4c7;" loading="lazy" /></a>
						<figcaption>
							<label><input type="checkbox" name="keep[]" value="<?php echo esc_attr( $path ); ?>" <?php checked( $used ); ?> /> <?php echo esc_html( ( $i + 1 ) . '. ' . __( 'use', 'tidelist' ) ); ?></label>
							<?php if ( $sent_url !== $url ) : ?>
								<br /><small><?php esc_html_e( 'a JPG copy is sent', 'tidelist' ); ?></small>
							<?php endif; ?>
						</figcaption>
					</figure>
				<?php endforeach; ?>
			</div>
			<p><button type="submit" class="button"><?php esc_html_e( 'Save photo choice for this product', 'tidelist' ); ?></button></p>
		</form>
		<?php
	}

	/**
	 * Compact text of the attributes.
	 *
	 * @param array $attributes Attributes.
	 */
	private function attributes_text( array $attributes ): string {
		$parts = array();
		foreach ( $attributes as $attribute ) {
			$value   = isset( $attribute['values'] ) ? implode( '+', (array) $attribute['values'] ) : (string) ( $attribute['value'] ?? '' );
			$parts[] = (string) $attribute['code'] . '=' . $value;
		}
		return implode( ' · ', $parts );
	}
}