<?php
/**
 * One advert as the plugin wants it on a marketplace, independent of the marketplace's own format.
 *
 * @package Tidelist
 */

namespace Tidelist\Channel;

use Tidelist\Support\Json;

/**
 * Marketplace-neutral listing (value object).
 */
final class Listing {

	/**
	 * Title.
	 *
	 * @var string
	 */
	public $title = '';

	/**
	 * Plain-text description.
	 *
	 * @var string
	 */
	public $description = '';

	/**
	 * Price in the marketplace currency.
	 *
	 * @var float
	 */
	public $price = 0.0;

	/**
	 * Currency code (EUR, PLN, …).
	 *
	 * @var string
	 */
	public $currency = 'EUR';

	/**
	 * Marketplace category ID (a leaf category).
	 *
	 * @var string
	 */
	public $category_id = '';

	/**
	 * Attributes: list of ['code' => string, 'value' => string] or ['code' => string, 'values' => string[]].
	 *
	 * @var array<int, array>
	 */
	public $attributes = array();

	/**
	 * Public image URLs, in display order.
	 *
	 * @var string[]
	 */
	public $images = array();

	/**
	 * Location, e.g. ['city_id' => 1234].
	 *
	 * @var array
	 */
	public $location = array();

	/**
	 * Contact, e.g. ['name' => 'Shop', 'phone' => '+359…'].
	 *
	 * @var array
	 */
	public $contact = array();

	/**
	 * ID of the item in the shop (used to find the advert again and to avoid duplicates).
	 *
	 * @var string
	 */
	public $external_id = '';

	/**
	 * Channel-specific extras (advertiser_type, courier, negotiable, …).
	 *
	 * @var array
	 */
	public $extra = array();

	/**
	 * Constructor.
	 *
	 * @param array $fields Field values by name. Unknown names are ignored.
	 */
	public function __construct( array $fields = array() ) {
		foreach ( $this->to_array() as $name => $default ) {
			if ( ! array_key_exists( $name, $fields ) ) {
				continue;
			}
			$value = $fields[ $name ];
			if ( is_float( $default ) ) {
				$value = (float) $value;
			} elseif ( is_string( $default ) ) {
				$value = (string) $value;
			} else {
				$value = (array) $value;
			}
			$this->$name = $value;
		}
	}

	/**
	 * All fields as an array.
	 */
	public function to_array(): array {
		return array(
			'title'       => $this->title,
			'description' => $this->description,
			'price'       => $this->price,
			'currency'    => $this->currency,
			'category_id' => $this->category_id,
			'attributes'  => $this->attributes,
			'images'      => $this->images,
			'location'    => $this->location,
			'contact'     => $this->contact,
			'external_id' => $this->external_id,
			'extra'       => $this->extra,
		);
	}

	/**
	 * Fingerprint (to detect changes after publishing).
	 */
	public function hash(): string {
		return sha1( Json::encode( $this->to_array() ) );
	}
}