<?php
namespace Agentsia_Agents;

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

final class Api_Client {

	const CACHE_TRANSIENT_PREFIX = 'agentsia_wp_';
	const CACHE_TTL              = 300;

	public static function build_url( string $path ): string {
		$settings = Plugin::get_settings();
		$base     = untrailingslashit( $settings['api_base'] ?: AGENTSIA_AGENTS_DEFAULT_API_BASE );
		return $base . '/' . ltrim( $path, '/' );
	}

	public static function request( string $path, array $args = [] ) {
		$settings = Plugin::get_settings();
		if ( empty( $settings['api_key'] ) ) {
			return new \WP_Error( 'agentsia_missing_api_key', __( 'Aucune clé API configurée.', 'agentsia-agents' ) );
		}

		$defaults = [
			'method'  => 'GET',
			'timeout' => 15,
			'headers' => [],
		];
		$args = array_merge( $defaults, $args );

		$args['headers'] = array_merge(
			[
				'Authorization' => 'Bearer ' . $settings['api_key'],
				'Accept'        => 'application/json',
				'User-Agent'    => 'AgentsiaWP/' . AGENTSIA_AGENTS_VERSION . ' (' . home_url() . ')',
			],
			(array) $args['headers']
		);

		$url = self::build_url( $path );
		$res = wp_remote_request( $url, $args );

		if ( is_wp_error( $res ) ) {
			return $res;
		}

		$code = wp_remote_retrieve_response_code( $res );
		$body = wp_remote_retrieve_body( $res );
		$data = json_decode( $body, true );

		if ( $code >= 400 ) {
			if ( is_array( $data ) && isset( $data['error'] ) ) {
				$message = (string) $data['error'];
			} else {
				/* translators: %d: HTTP status code */
				$message = sprintf( __( 'Erreur HTTP %d', 'agentsia-agents' ), $code );
			}
			return new \WP_Error( 'agentsia_api_error', $message, [ 'status' => $code ] );
		}

		return is_array( $data ) ? $data : [];
	}

	public static function verify_key(): array {
		$result = self::request( '/api/public/wp/me' );
		if ( is_wp_error( $result ) ) {
			return [
				'ok'      => false,
				'message' => $result->get_error_message(),
			];
		}
		return [
			'ok'      => true,
			'company' => $result['company'] ?? null,
			'scopes'  => $result['scopes'] ?? [],
		];
	}

	public static function list_chatbots( bool $fresh = false ): array {
		return self::cached_list( 'chatbots', '/api/public/wp/chatbots', 'chatbots', $fresh );
	}

	public static function list_booking_calendars( bool $fresh = false ): array {
		return self::cached_list( 'booking_calendars', '/api/public/wp/booking-calendars', 'calendars', $fresh );
	}

	private static function cached_list( string $cache_key, string $path, string $response_key, bool $fresh ): array {
		$transient_key = self::CACHE_TRANSIENT_PREFIX . $cache_key;

		if ( ! $fresh ) {
			$cached = get_transient( $transient_key );
			if ( is_array( $cached ) ) {
				return $cached;
			}
		}

		$result = self::request( $path );
		if ( is_wp_error( $result ) ) {
			return [];
		}

		$list = isset( $result[ $response_key ] ) && is_array( $result[ $response_key ] )
			? $result[ $response_key ]
			: [];

		set_transient( $transient_key, $list, self::CACHE_TTL );
		return $list;
	}

	public static function clear_cache(): void {
		delete_transient( self::CACHE_TRANSIENT_PREFIX . 'chatbots' );
		delete_transient( self::CACHE_TRANSIENT_PREFIX . 'booking_calendars' );
	}
}