#include <doctest/doctest.h>

#include <vector>

#include "packeteer/l7/mdns.hpp"

using namespace packeteer::net;

namespace {

// A typical mDNS query for a ".local" hostname, id=0 per RFC 6762
// 18.1's convention for multicast queries.
std::vector<unsigned char> mdns_query() {
    return {
        0x00, 0x00,  // id = 0
        0x00, 0x00,  // flags: query
        0x00, 0x01,  // qdcount = 1
        0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
        6, 'm', 'y', 'h', 'o', 's', 't', 5, 'l', 'o', 'c', 'a', 'l', 0,
        0x00, 0x01,  // qtype = A
        0x00, 0x01,  // qclass = IN
    };
}

}  // namespace

TEST_CASE("MdnsDissector claims port 5353") {
    MdnsDissector dissector;
    CHECK(dissector.port() == kMdnsPort);
}

TEST_CASE("MdnsDissector summarizes a query without an id= field") {
    MdnsDissector dissector;
    auto summary = dissector.summarize(mdns_query());
    REQUIRE(summary.has_value());
    CHECK(summary->substr(0, 10) == "mDNS query");
    CHECK(summary->find("myhost.local") != std::string::npos);
    CHECK(summary->find("id=") == std::string::npos);
}

TEST_CASE("MdnsDissector summarizes a response with ancount") {
    MdnsDissector dissector;
    std::vector<unsigned char> bytes = {
        0x00, 0x00,
        0x84, 0x00,  // flags: QR=1 (response), AA=1
        0x00, 0x00,  // qdcount = 0 (typical for an mDNS response)
        0x00, 0x01,  // ancount = 1
        0x00, 0x00, 0x00, 0x00,
    };
    auto summary = dissector.summarize(bytes);
    REQUIRE(summary.has_value());
    CHECK(summary->substr(0, 13) == "mDNS response");
    CHECK(summary->find("ancount=1") != std::string::npos);
}

TEST_CASE("MdnsDissector::summarize returns nullopt for a truncated payload") {
    MdnsDissector dissector;
    std::vector<unsigned char> bytes(5, 0);
    CHECK_FALSE(dissector.summarize(bytes).has_value());
}