Refactored JSON value retrieval

1 files changed, 25 insertions, 1 deletions

diff --git a/subprojects/battleNetApi/include/hearthstoneApi.hpp b/subprojects/battleNetApi/include/hearthstoneApi.hpp
index bbcc8c7..c11acc7 100644
--- a/subprojects/battleNetApi/include/hearthstoneApi.hpp
+++ b/subprojects/battleNetApi/include/hearthstoneApi.hpp
@@ -1,17 +1,41 @@
 #pragma once
 #include "token.hpp"
+#include <iostream>
+#include <regex>
 #include <string>
 
 class HearthstoneApi {
   public:
     HearthstoneApi(Token &&iToken);
-    std::uint64_t numberOfCards();
+    std::uint64_t numberOfCards(const std::string &iApiResponse) const;
 
   private:
     std::string authorizationHeader();
     std::string makeApiRequest(const std::string &iUrl) const;
     static size_t curlCallbackStringOutput(void *iContent, size_t iSize, size_t iNmemb, std::string *iS);
 
+    /**
+     * @brief
+     * @param[in] iJsonContent The std::string which contains Json (Battle.net API response for instance)
+     * @param[in] iKeyValueRegex The regex used to retrieve value from (key, value) pair
+     * An example: "\"cardCount\":(\\d+)"
+     */
+    template <typename T> T valueInJson(const std::string &iJsonContent, const std::string &iKeyValueRegex) const {
+        const std::regex iRegex{iKeyValueRegex};
+        std::smatch aMatches;
+        if (std::regex_search(iJsonContent, aMatches, iRegex)) {
+            const std::string kValueString{aMatches[1].str()};
+            T aValue;
+            const auto kConversionStatus =
+                std::from_chars(kValueString.data(), kValueString.data() + kValueString.size(), aValue);
+            if (kConversionStatus.ec == std::errc{}) {
+                return aValue;
+            }
+        }
+        std::cerr << std::format("Unable to find value with regex: '{}'\n", iKeyValueRegex);
+        return 0;
+    }
+
     Token mToken;
     std::string mAuthorizationHeader; //<! Bearer authorization string for OAuth 2.0 header