<?php
/**
 * Dashboard provider class.
 *
 * @package WP_Prometheus
 */

namespace Magdev\WpPrometheus\Admin;

// Prevent direct file access.
if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * DashboardProvider class.
 *
 * Provides Grafana dashboard templates for download.
 */
class DashboardProvider {

	/**
	 * Dashboard directory path.
	 *
	 * @var string
	 */
	private string $dashboard_dir;

	/**
	 * Available dashboard definitions.
	 *
	 * @var array
	 */
	private array $dashboards = array();

	/**
	 * Constructor.
	 */
	public function __construct() {
		$this->dashboard_dir = WP_PROMETHEUS_PATH . 'assets/dashboards/';

		$this->dashboards = array(
			'wordpress-overview'    => array(
				'title'       => __( 'WordPress Overview', 'wp-prometheus' ),
				'description' => __( 'General WordPress metrics including users, posts, comments, and plugins.', 'wp-prometheus' ),
				'file'        => 'wordpress-overview.json',
				'icon'        => 'dashicons-wordpress',
			),
			'wordpress-runtime'     => array(
				'title'       => __( 'Runtime Performance', 'wp-prometheus' ),
				'description' => __( 'HTTP request metrics, database query performance, and response times.', 'wp-prometheus' ),
				'file'        => 'wordpress-runtime.json',
				'icon'        => 'dashicons-performance',
			),
			'wordpress-woocommerce' => array(
				'title'       => __( 'WooCommerce Store', 'wp-prometheus' ),
				'description' => __( 'WooCommerce metrics including products, orders, revenue, and customers.', 'wp-prometheus' ),
				'file'        => 'wordpress-woocommerce.json',
				'icon'        => 'dashicons-cart',
			),
		);
	}

	/**
	 * Get list of available dashboards.
	 *
	 * @return array
	 */
	public function get_available(): array {
		$available = array();

		foreach ( $this->dashboards as $slug => $dashboard ) {
			$file_path = $this->dashboard_dir . $dashboard['file'];
			if ( file_exists( $file_path ) ) {
				$available[ $slug ] = $dashboard;
			}
		}

		return $available;
	}

	/**
	 * Get dashboard content by slug.
	 *
	 * @param string $slug Dashboard slug.
	 * @return string|null JSON content or null if not found.
	 */
	public function get_dashboard( string $slug ): ?string {
		// Validate slug to prevent directory traversal.
		$slug = sanitize_file_name( $slug );

		if ( ! isset( $this->dashboards[ $slug ] ) ) {
			return null;
		}

		$file_path = $this->dashboard_dir . $this->dashboards[ $slug ]['file'];

		// Security: Ensure file is within dashboard directory.
		$real_path = realpath( $file_path );
		$real_dir  = realpath( $this->dashboard_dir );

		if ( false === $real_path || false === $real_dir || strpos( $real_path, $real_dir ) !== 0 ) {
			return null;
		}

		if ( ! file_exists( $file_path ) || ! is_readable( $file_path ) ) {
			return null;
		}

		// phpcs:ignore WordPress.WP.AlternativeFunctions.file_get_contents_file_get_contents
		$content = file_get_contents( $file_path );

		if ( false === $content ) {
			return null;
		}

		return $content;
	}

	/**
	 * Get dashboard metadata by slug.
	 *
	 * @param string $slug Dashboard slug.
	 * @return array|null Dashboard metadata or null if not found.
	 */
	public function get_metadata( string $slug ): ?array {
		$slug = sanitize_file_name( $slug );

		if ( ! isset( $this->dashboards[ $slug ] ) ) {
			return null;
		}

		return $this->dashboards[ $slug ];
	}

	/**
	 * Get filename for download.
	 *
	 * @param string $slug Dashboard slug.
	 * @return string|null Filename or null if not found.
	 */
	public function get_filename( string $slug ): ?string {
		$slug = sanitize_file_name( $slug );

		if ( ! isset( $this->dashboards[ $slug ] ) ) {
			return null;
		}

		return $this->dashboards[ $slug ]['file'];
	}
}