/* test_job_dispatch.c -- scheduler-dispatch-commit task 1.1
 *
 * Unit tests for the Controller Dispatch-Failure Classification component
 * (design.md, "Controller Dispatch-Failure Classification"): a pure, static,
 * file-local function in job.c that maps each of dispatch_a_job_()'s six
 * post-lookup failure points (xce_dispatch_fail_site_t) to a retryable-vs-
 * terminal classification (xce_dispatch_fail_class_t), per Requirements
 * 4.1/4.2.
 *
 * xce_classify_dispatch_fail() and its enum types are deliberately NOT
 * declared in any header (design.md's own placement-correction note: nothing
 * outside job.c consumes them). This test file reaches the static function
 * through a thin, int-typed, XCE_TESTING-only wrapper exported from job.c
 * (xce_classify_dispatch_fail_test), the same pattern job.c already uses for
 * job_array_apply_test_set_force_fail_at()/friends -- and, like test_job_
 * array_fence.c's ha_arm_promotion_fence_timer_for_test, the extern
 * declaration lives directly in this test file rather than in a shared
 * header.
 *
 * No cluster_t/persist/worker fixture is needed: the classification is a
 * pure decision with no side effects, independently testable against every
 * known failure case without a live dispatch attempt (task 1.1's own
 * Observable-completion clause).
 */

#include <stdio.h>

#include <unity/unity.h>

/* Mirrors design.md's Service Interface enum values exactly (job.c's own
 * xce_dispatch_fail_site_t/xce_dispatch_fail_class_t are file-local and not
 * shared via a header -- this test drives the wrapper by the same plain-int
 * values documented there, not by including a private type). */
#define SITE_WORKER_LOOKUP    0
#define SITE_WORKER_NULL      1
#define SITE_WORKER_NOT_READY 2
#define SITE_INVALID_ALLOC    3
#define SITE_QUEUE_EXEC       4
#define SITE_RPC_FAILURE      5

#define CLASS_RETRYABLE 0
#define CLASS_TERMINAL  1

extern int xce_classify_dispatch_fail_test(int site);

static void test_worker_lookup_is_retryable(void)
{
    TEST_ASSERT_EQUAL_INT(CLASS_RETRYABLE,
                          xce_classify_dispatch_fail_test(SITE_WORKER_LOOKUP));
    printf("test_worker_lookup_is_retryable: PASS\n");
}

static void test_worker_null_is_retryable(void)
{
    TEST_ASSERT_EQUAL_INT(CLASS_RETRYABLE,
                          xce_classify_dispatch_fail_test(SITE_WORKER_NULL));
    printf("test_worker_null_is_retryable: PASS\n");
}

static void test_worker_not_ready_is_retryable(void)
{
    TEST_ASSERT_EQUAL_INT(CLASS_RETRYABLE, xce_classify_dispatch_fail_test(
                                               SITE_WORKER_NOT_READY));
    printf("test_worker_not_ready_is_retryable: PASS\n");
}

static void test_rpc_failure_is_retryable(void)
{
    TEST_ASSERT_EQUAL_INT(CLASS_RETRYABLE,
                          xce_classify_dispatch_fail_test(SITE_RPC_FAILURE));
    printf("test_rpc_failure_is_retryable: PASS\n");
}

static void test_invalid_alloc_is_terminal(void)
{
    TEST_ASSERT_EQUAL_INT(CLASS_TERMINAL,
                          xce_classify_dispatch_fail_test(SITE_INVALID_ALLOC));
    printf("test_invalid_alloc_is_terminal: PASS\n");
}

static void test_queue_exec_is_terminal(void)
{
    TEST_ASSERT_EQUAL_INT(CLASS_TERMINAL,
                          xce_classify_dispatch_fail_test(SITE_QUEUE_EXEC));
    printf("test_queue_exec_is_terminal: PASS\n");
}

/* Invariant (design.md Service Interface Postconditions): the same site
 * always classifies the same way -- no hidden state, no time-dependence. */
static void test_classification_is_stable_across_repeated_calls(void)
{
    int first  = xce_classify_dispatch_fail_test(SITE_WORKER_NOT_READY);
    int second = xce_classify_dispatch_fail_test(SITE_WORKER_NOT_READY);
    int third  = xce_classify_dispatch_fail_test(SITE_QUEUE_EXEC);
    int fourth = xce_classify_dispatch_fail_test(SITE_QUEUE_EXEC);

    TEST_ASSERT_EQUAL_INT(first, second);
    TEST_ASSERT_EQUAL_INT(third, fourth);
    printf("test_classification_is_stable_across_repeated_calls: PASS\n");
}

void test_job_dispatch(void)
{
    UnitySetTestFile(__FILE__);
    printf("\n>> dispatch-failure classification tests (Req 4.1, 4.2)\n\n");

    RUN_TEST(test_worker_lookup_is_retryable);
    RUN_TEST(test_worker_null_is_retryable);
    RUN_TEST(test_worker_not_ready_is_retryable);
    RUN_TEST(test_rpc_failure_is_retryable);
    RUN_TEST(test_invalid_alloc_is_terminal);
    RUN_TEST(test_queue_exec_is_terminal);
    RUN_TEST(test_classification_is_stable_across_repeated_calls);
}