feat: parse group info

src/klotski_core/ffi/tmain.cc

@@ -38,11 +38,23 @@ void tmain() {
 //    auto start = clock();
 
 //    auto ret = GroupCase::encode(CommonCode(0x1A9BF0C00));
-    auto ret = GroupCase::encode(CommonCode(0x4FEA13400));
-
-    std::cout << "type id: " << ret.type_id << std::endl;
-    std::cout << "group id: " << ret.group_id << std::endl;
-    std::cout << "group index: " << ret.group_index << std::endl;
+//    auto ret = GroupCase::encode(CommonCode(0x4FEA13400));
+//
+//    std::cout << "type id: " << ret.type_id << std::endl;
+//    std::cout << "group id: " << ret.group_id << std::endl;
+//    std::cout << "group index: " << ret.group_index << std::endl;
+
+    std::cout << GroupCase::parse({
+        .type_id = 169,
+        .group_id = 1,
+        .group_index = 7472,
+    }) << std::endl;
+
+    std::cout << GroupCase::parse({
+         .type_id = 164,
+         .group_id = 0,
+         .group_index = 30833,
+    }) << std::endl;
 
 //    std::cerr << (clock() - start) * 1000 / CLOCKS_PER_SEC << "ms" << std::endl;
 

src/klotski_core/group/group_info.cc

@@ -2,8 +2,6 @@
 #include "group.h"
 #include "type_id.h"
 
-#include <iostream>
-
 namespace klotski {
 
 /// --------------------------------------- Group Type ----------------------------------------
@@ -38,11 +36,21 @@ GroupCase::info_t GroupCase::encode(const RawCode &raw_code) noexcept {
     return encode(raw_code.to_common_code());
 }
 
-GroupCase::info_t GroupCase::encode(const CommonCode &common_code) noexcept {
-    auto cases = Group::cases(common_code);
+CommonCode GroupCase::parse(const info_t &info) {
+    auto cases = Group(info.type_id, info.group_id).cases();
+    if (cases.size() <= info.group_index) {
+        throw std::invalid_argument("group index overflow"); // check group index
+    }
+
     std::vector<CommonCode> group(cases.begin(), cases.end());
+    std::nth_element(group.begin(), group.begin() + info.group_index, group.end());
+    return group[info.group_index]; // located nth as target
+}
 
+GroupCase::info_t GroupCase::encode(const CommonCode &common_code) noexcept {
     uint32_t group_index = 0;
+    auto cases = Group::cases(common_code);
+    std::vector<CommonCode> group(cases.begin(), cases.end());
     for (auto &&code: group) {
         if (code < common_code) {
             ++group_index; // locate group index
@@ -58,13 +66,4 @@ GroupCase::info_t GroupCase::encode(const CommonCode &common_code) noexcept {
     };
 }
 
-CommonCode GroupCase::parse(const info_t &info) {
-
-    // TODO: check group index
-
-    // TODO: function body
-
-    return CommonCode(0);
-}
-
 } // namespace klotski