From cabd1347f86a0235ab4b367b1d8a73c0be5ed170 Mon Sep 17 00:00:00 2001
From: liuxueli <liuxueli@iieac.cn>
Date: Mon, 14 Aug 2023 20:10:05 +0800
Subject: err proc for fieldstat_get_cube_version

---
 include/fieldstat/fieldstat.h    |  7 ++++++-
 src/fieldstat.c                  | 15 ++++++++++++---
 test/test_register_and_reset.cpp | 10 +++++++++-
 3 files changed, 27 insertions(+), 5 deletions(-)

diff --git a/include/fieldstat/fieldstat.h b/include/fieldstat/fieldstat.h
index 1935cdb..acf086c 100644
--- a/include/fieldstat/fieldstat.h
+++ b/include/fieldstat/fieldstat.h
@@ -64,7 +64,12 @@ int fieldstat_register_cube(struct fieldstat *instance, const struct fieldstat_t
     * @return 0 if success. -1 if cube_id is invalid.
 */
 int fieldstat_unregister_cube(struct fieldstat *instance, int cube_id);
-unsigned long fieldstat_get_cube_version(const struct fieldstat *instance, int cube_id);
+
+/*
+    * @brief get the cube_version of the cube of cube_id.
+    * @return cube_version if success. -1 if instance is NULL. -2 if cube_id is -1. -3 if the cube_id is invalid(never registered for even once)
+*/
+long long fieldstat_get_cube_version(const struct fieldstat *instance, int cube_id);
 /*
     * @brief add a metric to the cube of cube_id. One metric may have multiple sub-metric that are associated with different cells.
     * @param cube_id: cube id, previously returned by fieldstat_register_cube.
diff --git a/src/fieldstat.c b/src/fieldstat.c
index 5d2603f..f5f2f12 100644
--- a/src/fieldstat.c
+++ b/src/fieldstat.c
@@ -127,12 +127,21 @@ int fieldstat_unregister_cube(struct fieldstat *instance, int cube_id)
     return 0;
 }
 
-unsigned long fieldstat_get_cube_version(const struct fieldstat *instance, int cube_id)
+long long fieldstat_get_cube_version(const struct fieldstat *instance, int cube_id)
 {
+    if (instance == NULL) {
+        return -1;
+    }
+    if (cube_id < 0) {
+        return -2;
+    }
     if (cube_id >= instance->valid_cube_arr_length) {
-        //printf("ERR: cube_id is out of range\n");
-        return 0;
+        return -3;
+    }
+    if (instance->cube[cube_id] == NULL && instance->cube_version[cube_id] == 0) {
+        return -3;
     }
+
     return instance->cube_version[cube_id];
 }
 
diff --git a/test/test_register_and_reset.cpp b/test/test_register_and_reset.cpp
index 8376f97..28d65a5 100644
--- a/test/test_register_and_reset.cpp
+++ b/test/test_register_and_reset.cpp
@@ -28,11 +28,19 @@ TEST(test_register, delete_cube_and_version_increase)
     ret = fieldstat_unregister_cube(instance, cube_id);
     EXPECT_EQ(ret, -1);
     EXPECT_EQ(fieldstat_get_cube_version(instance, cube_id), 1);
-    EXPECT_EQ(fieldstat_get_cube_version(instance, 123), 0);
 
     fieldstat_free(instance);
 }
 
+TEST(test_register, query_on_wrong_version)
+{
+    EXPECT_EQ(fieldstat_get_cube_version(NULL, 1), -1);
+    struct fieldstat *instance = fieldstat_new();
+    EXPECT_EQ(fieldstat_get_cube_version(instance, 1), -3);
+    EXPECT_EQ(fieldstat_get_cube_version(instance, -1), -2);
+    fieldstat_free(instance);
+}
+
 TEST(test_register, delete_cube_and_register_and_origin_position)
 {
     struct fieldstat *instance = fieldstat_new();
-- 
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