/*
 * test_netio_reconnect_gen.c — TDD tests for endpoint_t.reconnect_gen.
 *
 * component-failover-adoption Phase 6 (bug-1548): a monotonic counter bumped
 * by xce_ctx_reconnect() (xcectx.c) on every successful transport reconnect,
 * so a consumer (apiserver's heartbeat prober) can detect a reconnect even
 * when it completed silently inside a single XCECLI_FF_CALL and the call's
 * own return code never surfaced a failure.
 *
 * Mirrors test_netio_on_fini.c's structure for the same class of field
 * (a passive observation point added to endpoint_t). These tests exercise
 * only the field's lifecycle guarantees at the netio.c level — they do NOT
 * exercise xce_ctx_reconnect() itself (that requires a live socket/SSL
 * handshake) and are not a substitute for the required live E2E re-run of
 * task 5.2's scenario. Tests verify:
 *   1. A freshly heap-allocated endpoint_t starts with reconnect_gen == 0
 *   2. endpoint_init() does not reset a previously-bumped value
 *   3. endpoint_fini() does not reset a previously-bumped value
 */

#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <sys/socket.h>

#include <unity/unity.h>
#include "netio.h"

/* ── Test 1: fresh endpoint_t starts at zero ─────────────────────── */

static void test_reconnect_gen_starts_at_zero(void)
{
    endpoint_t *ep = endpoint_get();
    TEST_ASSERT_NOT_NULL(ep);

    TEST_ASSERT_EQUAL_UINT64(0, ep->reconnect_gen);

    free(ep);
    printf("test_reconnect_gen_starts_at_zero: PASS\n");
}

/* ── Test 2: endpoint_init() does not reset a bumped value ───────── */

static void test_reconnect_gen_survives_endpoint_init(void)
{
    endpoint_t *ep = endpoint_get();
    TEST_ASSERT_NOT_NULL(ep);

    ep->reconnect_gen = 7;

    int fd = endpoint_init(ep, AF_INET, SOCK_STREAM, 0, 0);
    TEST_ASSERT_TRUE(fd >= 0);

    TEST_ASSERT_EQUAL_UINT64(7, ep->reconnect_gen);

    endpoint_fini(ep);
    free(ep);
    printf("test_reconnect_gen_survives_endpoint_init: PASS\n");
}

/* ── Test 3: endpoint_fini() does not reset a bumped value ───────── */

static void test_reconnect_gen_survives_endpoint_fini(void)
{
    endpoint_t *ep = endpoint_get();
    TEST_ASSERT_NOT_NULL(ep);

    int fd = endpoint_init(ep, AF_INET, SOCK_STREAM, 0, 0);
    TEST_ASSERT_TRUE(fd >= 0);

    ep->reconnect_gen = 3;

    endpoint_fini(ep);

    TEST_ASSERT_EQUAL_UINT64(3, ep->reconnect_gen);

    free(ep);
    printf("test_reconnect_gen_survives_endpoint_fini: PASS\n");
}

/* ── Test suite entry point ───────────────────────────────────────── */

void test_netio_reconnect_gen(void)
{
    printf("\n>> netio reconnect_gen field lifecycle tests\n\n");

    RUN_TEST(test_reconnect_gen_starts_at_zero);
    RUN_TEST(test_reconnect_gen_survives_endpoint_init);
    RUN_TEST(test_reconnect_gen_survives_endpoint_fini);
}