feat(domain): add entities and json helpers for sqlite schema

backend/src/domain/enum_strings.cc

@@ -0,0 +1,74 @@
+#include "csp/domain/enum_strings.h"
+
+#include <algorithm>
+
+namespace csp::domain {
+
+namespace {
+
+std::string Upper(std::string s) {
+  std::transform(s.begin(), s.end(), s.begin(), [](unsigned char c) {
+    return static_cast<char>(std::toupper(c));
+  });
+  return s;
+}
+
+}  // namespace
+
+std::string ToString(SubmissionStatus s) {
+  switch (s) {
+    case SubmissionStatus::Pending:
+      return "Pending";
+    case SubmissionStatus::Compiling:
+      return "Compiling";
+    case SubmissionStatus::Running:
+      return "Running";
+    case SubmissionStatus::AC:
+      return "AC";
+    case SubmissionStatus::WA:
+      return "WA";
+    case SubmissionStatus::TLE:
+      return "TLE";
+    case SubmissionStatus::MLE:
+      return "MLE";
+    case SubmissionStatus::RE:
+      return "RE";
+    case SubmissionStatus::CE:
+      return "CE";
+    case SubmissionStatus::Unknown:
+    default:
+      return "Unknown";
+  }
+}
+
+SubmissionStatus SubmissionStatusFromString(const std::string& s) {
+  const auto u = Upper(s);
+  if (u == "PENDING") return SubmissionStatus::Pending;
+  if (u == "COMPILING") return SubmissionStatus::Compiling;
+  if (u == "RUNNING") return SubmissionStatus::Running;
+  if (u == "AC") return SubmissionStatus::AC;
+  if (u == "WA") return SubmissionStatus::WA;
+  if (u == "TLE") return SubmissionStatus::TLE;
+  if (u == "MLE") return SubmissionStatus::MLE;
+  if (u == "RE") return SubmissionStatus::RE;
+  if (u == "CE") return SubmissionStatus::CE;
+  return SubmissionStatus::Unknown;
+}
+
+std::string ToString(Language l) {
+  switch (l) {
+    case Language::Cpp:
+      return "cpp";
+    case Language::Unknown:
+    default:
+      return "unknown";
+  }
+}
+
+Language LanguageFromString(const std::string& s) {
+  const auto u = Upper(s);
+  if (u == "CPP" || u == "C++" || u == "CXX") return Language::Cpp;
+  return Language::Unknown;
+}
+
+}  // namespace csp::domain

backend/src/domain/json.cc

@@ -0,0 +1,54 @@
+#include "csp/domain/json.h"
+
+namespace csp::domain {
+
+Json::Value ToPublicJson(const User& u) {
+  Json::Value j;
+  j["id"] = Json::Int64(u.id);
+  j["username"] = u.username;
+  j["rating"] = u.rating;
+  j["created_at"] = Json::Int64(u.created_at);
+  return j;
+}
+
+Json::Value ToJson(const Problem& p) {
+  Json::Value j;
+  j["id"] = Json::Int64(p.id);
+  j["slug"] = p.slug;
+  j["title"] = p.title;
+  j["statement_md"] = p.statement_md;
+  j["difficulty"] = p.difficulty;
+  j["source"] = p.source;
+  j["created_at"] = Json::Int64(p.created_at);
+  return j;
+}
+
+Json::Value ToJson(const Submission& s) {
+  Json::Value j;
+  j["id"] = Json::Int64(s.id);
+  j["user_id"] = Json::Int64(s.user_id);
+  j["problem_id"] = Json::Int64(s.problem_id);
+  j["language"] = ToString(s.language);
+  j["status"] = ToString(s.status);
+  j["score"] = s.score;
+  j["time_ms"] = s.time_ms;
+  j["memory_kb"] = s.memory_kb;
+  j["created_at"] = Json::Int64(s.created_at);
+  return j;
+}
+
+Json::Value ToJson(const WrongBookItem& w) {
+  Json::Value j;
+  j["user_id"] = Json::Int64(w.user_id);
+  j["problem_id"] = Json::Int64(w.problem_id);
+  if (w.last_submission_id.has_value()) {
+    j["last_submission_id"] = Json::Int64(*w.last_submission_id);
+  } else {
+    j["last_submission_id"] = Json::nullValue;
+  }
+  j["note"] = w.note;
+  j["updated_at"] = Json::Int64(w.updated_at);
+  return j;
+}
+
+}  // namespace csp::domain