#pragma once

#include <xrpl/beast/utility/Journal.h>
#include <xrpl/peerfinder/Types.h>

#include <boost/system/error_code.hpp>

#include <string>

namespace xrpl::peer_finder {

/**
 * A static or dynamic source of peer addresses.
 * These are used as fallbacks when we are bootstrapping and don't have
 * a local cache, or when none of our addresses are functioning. Typically
 * sources will represent things like static text in the config file, a
 * separate local file with addresses, or a remote HTTPS URL that can
 * be updated automatically. Another solution is to use a custom DNS server
 * that hands out peer IP addresses when name lookups are performed.
 */
class Source
{
public:
    /**
     * The results of a fetch.
     */
    struct Results
    {
        explicit Results() = default;

        // error_code on a failure
        boost::system::error_code error;

        // list of fetched endpoints
        IPAddresses addresses;
    };

    virtual ~Source() = default;
    virtual std::string const&
    name() = 0;
    virtual void
    cancel()
    {
    }
    virtual void
    fetch(Results& results, beast::Journal journal) = 0;
};

}  // namespace xrpl::peer_finder