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#include "src/core/ext/transport/chttp2/alpn/alpn.h"

#include <grpc/support/log.h>
#include "test/core/util/test_config.h"

static void test_alpn_success(void) {
  GPR_ASSERT(grpc_chttp2_is_alpn_version_supported("h2", 2));
  GPR_ASSERT(grpc_chttp2_is_alpn_version_supported("grpc-exp", 8));
}

static void test_alpn_failure(void) {
  GPR_ASSERT(!grpc_chttp2_is_alpn_version_supported("h2-155", 6));
  GPR_ASSERT(!grpc_chttp2_is_alpn_version_supported("h1-15", 5));
}

// First index in ALPN supported version list of a given protocol. Returns a
// value one beyond the last valid element index if not found.
static size_t alpn_version_index(const char *version, size_t size) {
  size_t i;
  for (i = 0; i < grpc_chttp2_num_alpn_versions(); ++i) {
    if (!strncmp(version, grpc_chttp2_get_alpn_version_index(i), size)) {
      return i;
    }
  }
  return i;
}

static void test_alpn_grpc_before_h2(void) {
  // grpc-exp is preferred over h2.
  GPR_ASSERT(alpn_version_index("grpc-exp", 8) < alpn_version_index("h2", 2));
}

int main(int argc, char **argv) {
  grpc_test_init(argc, argv);
  test_alpn_success();
  test_alpn_failure();
  test_alpn_grpc_before_h2();
  return 0;
}