<?php declare( strict_types=1 );

namespace ACP\ConditionalFormat;

use AC\Type\ListScreenId;
use AC\Type\UserId;
use ACP\ConditionalFormat\Entity\Rule;

final class RulesRepository {

	private const FORMAT = 'format';
	private const FACT = 'fact';
	private const OPERATOR = 'operator';
	private const COLUMN_NAME = 'column_name';

	/**
	 * @var string
	 */
	private $key;

	public function __construct( ListScreenId $list_screen_id ) {
		$this->key = 'ac_conditional_format_' . $list_screen_id;
	}

	public function find( UserId $id ): RuleCollection {
		$rules = get_user_meta( $id->get_value(), $this->key, true );

		if ( ! is_array( $rules ) ) {
			$rules = [];
		}

		return $this->create_rules( $rules );
	}

	public function find_by_column( UserId $id, string $column_name ): RuleCollection {
		$rule_collection = new RuleCollection();

		foreach ( $this->find( $id ) as $rule ) {
			if ( $column_name === $rule->get_column_name() ) {
				$rule_collection->add( $rule );
			}
		}

		return $rule_collection;
	}

	public function save( UserId $id, RuleCollection $rules ): void {
		$encoded = [];

		foreach ( $rules as $rule ) {
			$encoded[] = [
				self::COLUMN_NAME => $rule->get_column_name(),
				self::FORMAT      => $rule->get_format(),
				self::OPERATOR    => $rule->get_operator(),
				self::FACT        => $rule->has_fact() ? $rule->get_fact() : null,
			];
		}

		update_user_meta( $id->get_value(), $this->key, $encoded );
	}

	public function remove( UserId $id ): void {
		delete_user_meta( $id->get_value(), $this->key );
	}

	public function remove_for_all_users(): void {
		global $wpdb;

		$wpdb->delete(
			$wpdb->usermeta,
			[
				'meta_key' => $this->key,
			],
			[
				'%s',
			]
		);
	}

	private function create_rules( array $encoded_rules ): RuleCollection {
		$rule_collection = new RuleCollection();

		foreach ( $encoded_rules as $encoded_rule ) {
			$rule = new Rule(
				$encoded_rule[ self::COLUMN_NAME ],
				$encoded_rule[ self::FORMAT ],
				$encoded_rule[ self::OPERATOR ],
				$encoded_rule[ self::FACT ] ?? null
			);

			$rule_collection->add( $rule );
		}

		return $rule_collection;
	}

}