<?php
/**
 * A coupon campaign: one offer with its rules, giving either personal codes or one shared code.
 *
 * @package CNWS\Coupons
 */

namespace CNWS\Coupons;

defined( 'ABSPATH' ) || exit;

final class Campaign {

	public const TYPE_PERSONAL = 'personal';
	public const TYPE_SHARED   = 'shared';

	public const TYPES          = array( self::TYPE_PERSONAL, self::TYPE_SHARED );
	public const DISCOUNT_TYPES = array( 'percent', 'fixed_cart' );
	public const STATUSES       = array( 'active', 'ended' );

	public int $id = 0;

	public string $slug = '';

	public string $name = '';

	public int $category_id = 0;

	public string $type = self::TYPE_PERSONAL;

	public string $discount_type = 'percent';

	public float $amount = 0.0;

	/**
	 * First valid day (Y-m-d), or '' for immediately.
	 */
	public string $starts_on = '';

	/**
	 * Last valid day (Y-m-d), or '' for none.
	 */
	public string $expires_on = '';

	/**
	 * Personal codes: days a code stays valid after it was issued, or 0 for no limit.
	 */
	public int $valid_days = 0;

	public string $code_prefix = '';

	/**
	 * Personal codes: most codes the campaign may issue, or 0 for no limit.
	 */
	public int $max_codes = 0;

	/**
	 * Personal codes: how many orders may use one code.
	 */
	public int $uses_per_code = 1;

	/**
	 * Shared code: most orders that may use it in total, or 0 for no limit.
	 */
	public int $max_redemptions = 0;

	/**
	 * Shared code: most orders per e-mail address, or 0 for no limit.
	 */
	public int $max_per_email = 0;

	/**
	 * What the codes cover: products, categories, tags, attributes, sale items, countries, amounts.
	 */
	public Restrictions $restrictions;

	public bool $email_restricted = true;

	/**
	 * Settings stored by add-on plugins, keyed by add-on.
	 *
	 * @var array<string, mixed>
	 */
	public array $extensions = array();

	public string $status = 'active';

	public function __construct() {
		$this->restrictions = new Restrictions();
	}

	/**
	 * @param array|object $row Database row.
	 */
	public static function from_row( $row ): self {
		$row      = (array) $row;
		$campaign = new self();

		$campaign->id               = (int) ( $row['id'] ?? 0 );
		$campaign->slug             = (string) ( $row['slug'] ?? '' );
		$campaign->name             = (string) ( $row['name'] ?? '' );
		$campaign->category_id      = (int) ( $row['category_id'] ?? 0 );
		$campaign->type             = self::allowed( $row['type'] ?? '', self::TYPES );
		$campaign->discount_type    = self::allowed( $row['discount_type'] ?? '', self::DISCOUNT_TYPES );
		$campaign->amount           = (float) ( $row['amount'] ?? 0 );
		$campaign->starts_on        = (string) ( $row['starts_on'] ?? '' );
		$campaign->expires_on       = (string) ( $row['expires_on'] ?? '' );
		$campaign->valid_days       = (int) ( $row['valid_days'] ?? 0 );
		$campaign->code_prefix      = (string) ( $row['code_prefix'] ?? '' );
		$campaign->max_codes        = (int) ( $row['max_codes'] ?? 0 );
		$campaign->uses_per_code    = max( 1, (int) ( $row['uses_per_code'] ?? 1 ) );
		$campaign->max_redemptions  = (int) ( $row['max_redemptions'] ?? 0 );
		$campaign->max_per_email    = (int) ( $row['max_per_email'] ?? 0 );
		$campaign->restrictions     = Restrictions::from_array( $row['restrictions'] ?? array() );
		$campaign->email_restricted = ! empty( $row['email_restricted'] );
		$campaign->extensions       = self::json_object( $row['extensions'] ?? '' );
		$campaign->status           = self::allowed( $row['status'] ?? '', self::STATUSES );

		return $campaign;
	}

	public function is_active(): bool {
		return 'active' === $this->status;
	}

	public function is_shared(): bool {
		return self::TYPE_SHARED === $this->type;
	}

	/**
	 * How many orders may use one code of this campaign, or 0 for no limit.
	 */
	public function uses_limit(): int {
		return $this->is_shared() ? $this->max_redemptions : $this->uses_per_code;
	}

	/**
	 * Whether the campaign's first valid day has come, in the site's time zone.
	 *
	 * @param int $now Unix timestamp.
	 */
	public function has_started( int $now ): bool {
		if ( '' === $this->starts_on ) {
			return true;
		}

		$today = ( new \DateTimeImmutable( '@' . $now ) )->setTimezone( wp_timezone() )->format( 'Y-m-d' );

		return $today >= $this->starts_on;
	}

	/**
	 * An add-on's stored settings.
	 *
	 * @param string $key Add-on key.
	 */
	public function extension( string $key ): array {
		return isset( $this->extensions[ $key ] ) && is_array( $this->extensions[ $key ] ) ? $this->extensions[ $key ] : array();
	}

	/**
	 * @param mixed $value JSON list, array or comma-separated string.
	 * @return int[]
	 */
	public static function id_list( $value ): array {
		if ( is_string( $value ) && '' !== $value && '[' === $value[0] ) {
			$value = json_decode( $value, true );
		} elseif ( is_string( $value ) ) {
			$value = explode( ',', $value );
		}

		return array_values( array_unique( array_filter( array_map( 'absint', (array) $value ) ) ) );
	}

	/**
	 * @param mixed $value JSON object or array.
	 */
	private static function json_object( $value ): array {
		if ( is_string( $value ) && '' !== $value ) {
			$value = json_decode( $value, true );
		}

		return is_array( $value ) ? $value : array();
	}

	/**
	 * @param mixed    $value   Stored value.
	 * @param string[] $allowed Allowed values; the first is the default.
	 */
	private static function allowed( $value, array $allowed ): string {
		return in_array( $value, $allowed, true ) ? (string) $value : $allowed[0];
	}
}