OCDB: Function to get cache count for regions

ocdb.cpp

@@ -407,3 +407,52 @@ void OCdb::set_revision(int rev) {
 	revision = rev;
 	request("UPDATE revision SET revision = " + std::to_string(revision) + ';');
 }
+
+std::map<std::string, int> OCdb::get_region_stats() {
+	std::map<std::string, int> count;
+	int res;
+	std::vector<std::string> regions = {
+		"dolnośląskie",
+		"śląskie",
+		"kujawsko-pomorskie",
+		"łódzkie",
+		"lubelskie",
+		"lubuskie",
+		"małopolskie",
+		"mazowieckie",
+		"opolskie",
+		"podkarpackie",
+		"podlaskie",
+		"pomorskie",
+		"świętokrzyskie",
+		"warmińsko-mazurskie",
+		"wielkopolskie",
+		"zachodniopomorskie"
+	};
+
+	//code TEXT PRIMARY KEY, name TEXT, location TEXT, type TEXT, status TEXT, size TEXT, difficulty REAL, terrain REAL, country TEXT, region TEXT, owner TEXT)
+	std::string sql = "SELECT COUNT(code) FROM caches WHERE status = 'Available' AND region = ?;";
+
+	res = sqlite3_prepare_v2(db, sql.c_str(), sql.length() + 1, &stmt, NULL);
+	if (res != SQLITE_OK) {
+		Debug(1) << "Request \"" << sql << "\" failed:\n"
+				 << sqlite3_errmsg(db);
+		throw 0;
+	}
+
+	for (auto reg : regions) {
+		sqlite3_bind_text(stmt, 1, reg.c_str(), -1, nullptr);
+		res = sqlite3_step(stmt);
+		if (res != SQLITE_ROW) {
+			Debug(1) << "Request \"" << sql << "\" failed:\n"
+					 << sqlite3_errmsg(db);
+			throw 0;
+		}
+		count[reg] = sqlite3_column_int(stmt, 0);
+		sqlite3_reset(stmt);
+		sqlite3_clear_bindings(stmt);
+	}
+
+	sqlite3_finalize(stmt);
+	return count;
+}

ocdb.h

@@ -4,6 +4,7 @@
 #include "api.h"
 
 #include <string>
+#include <map>
 #include <nlohmann/json_fwd.hpp>
 
 typedef struct sqlite3 sqlite3;
@@ -36,4 +37,5 @@ public:
 
 	Caches get_user_caches_not_found(const std::string& uuid) const;
 	Caches get_user_caches(const std::string& uuid, int count = 0) const override;
+	std::map<std::string, int> get_region_stats();
 };