5 files changed, 64 insertions, 14 deletions
diff --git a/subprojects/battleNetApi/include/apiUrl.hpp b/subprojects/battleNetApi/include/apiUrl.hpp
index 12124c6..509b248 100644
--- a/subprojects/battleNetApi/include/apiUrl.hpp
+++ b/subprojects/battleNetApi/include/apiUrl.hpp
@@ -9,7 +9,8 @@ class ApiUrl {
     void setRegion(const std::string &iRegion);
     void setLocale(const std::string &iLocale);
     void setGameMode(const std::string &iGameMode);
-    std::string operator()();
+    void setPageSize(const std::string &iPageSize);
+    std::string operator()() const;
 
   private:
     std::string mContentType;
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
 
diff --git a/subprojects/battleNetApi/src/apiUrl.cpp b/subprojects/battleNetApi/src/apiUrl.cpp
index e08c8c7..3de13cd 100644
--- a/subprojects/battleNetApi/src/apiUrl.cpp
+++ b/subprojects/battleNetApi/src/apiUrl.cpp
@@ -4,15 +4,29 @@
 ApiUrl::ApiUrl(const std::string &iContentType, const std::string &iRegion)
     : mContentType{iContentType}, mRegion{iRegion} {}
 void ApiUrl::setRegion(const std::string &iRegion) {
-    mRegion = iRegion; //<! eu
+    if (not iRegion.empty()) {
+        mRegion = iRegion; //!< The region of the data to receive, e.g. "eu"
+    }
 }
 void ApiUrl::setLocale(const std::string &iLocale) {
-    aParameters["locale"] = iLocale; //<! fr_FR, ko_KR
+    if (not iLocale.empty()) {
+        aParameters["locale"] = iLocale; //!< The locale to reflect in localized data, e.g. "fr_FR" or "ko_KR"
+                                         //!< If you do not supply a value, all translations are returned.
+    }
 }
 void ApiUrl::setGameMode(const std::string &iGameMode) {
-    aParameters["gameMode"] = iGameMode; //<! constructed
+    if (not iGameMode.empty()) {
+        aParameters["gameMode"] =
+            iGameMode; //!< A recognized game mode, e.g. "constructed"
+                       //!< @see https://community.developer.battle.net/documentation/hearthstone/guides/game-modes
+    }
+}
+void ApiUrl::setPageSize(const std::string &iPageSize) {
+    if (not iPageSize.empty()) {
+        aParameters["pageSize"] = iPageSize; //!< The number of results to choose per page, e.g. "40"
+    }
 }
-std::string ApiUrl::operator()() {
+std::string ApiUrl::operator()() const {
     std::string aFormattedParameters;
     for (const auto &[key, value] : aParameters) {
         aFormattedParameters += std::format("&{}={}", key, value);
diff --git a/subprojects/battleNetApi/src/hearthstoneApi.cpp b/subprojects/battleNetApi/src/hearthstoneApi.cpp
index b6eaf71..c34e6ad 100644
--- a/subprojects/battleNetApi/src/hearthstoneApi.cpp
+++ b/subprojects/battleNetApi/src/hearthstoneApi.cpp
@@ -4,11 +4,10 @@
 
 HearthstoneApi::HearthstoneApi(Token &&iToken) : mToken(iToken), mAuthorizationHeader(authorizationHeader()) {}
 
-std::uint64_t HearthstoneApi::numberOfCards() {
-    // TODO: implement logic
-    return 123456;
+std::uint64_t HearthstoneApi::numberOfCards(const std::string &iApiResponse) const {
+    const std::string aCardCountRegex{"\"cardCount\":(\\d+)"};
+    return valueInJson<std::uint64_t>(iApiResponse, aCardCountRegex);
 }
-
 std::string HearthstoneApi::authorizationHeader() { return std::format("Authorization: Bearer {}", mToken.toString()); }
 
 size_t HearthstoneApi::curlCallbackStringOutput(void *iContent, size_t iSize, size_t iNmemb, std::string *iS) {
diff --git a/subprojects/battleNetApi/tests/tests.cpp b/subprojects/battleNetApi/tests/tests.cpp
index 368a767..6513301 100644
--- a/subprojects/battleNetApi/tests/tests.cpp
+++ b/subprojects/battleNetApi/tests/tests.cpp
@@ -22,7 +22,10 @@ class TokenMock {
 class HearthstoneApiMock {
   public:
     HearthstoneApiMock() : mHearthstoneApi(std::move(mToken.getToken())) {};
-    std::string makeApiRequest(const std::string &iCardsUrl) { return mHearthstoneApi.makeApiRequest(iCardsUrl); }
+    std::string makeApiRequest(const std::string &iUrl) { return mHearthstoneApi.makeApiRequest(iUrl); }
+    std::uint64_t numberOfCards(const std::string &iApiResponse) {
+        return mHearthstoneApi.numberOfCards(iApiResponse);
+    };
 
   private:
     TokenMock mToken;
@@ -38,9 +41,16 @@ TEST_CASE("Retrieve API Token", "[getApiToken]") {
     REQUIRE(kTokenSize <= 40);
 }
 
-TEST_CASE("Retrieve number of pages", "[getPagesCount]") {
+TEST_CASE("Retrieve number of cards", "[getCardsCount]") {
     HearthstoneApiMock aHearthstoneApi;
-    // std::cout << aHearthstoneApi.numberOfCards() << '\n';
+    const std::string kContentType{"cards"};
+    const std::string kRegion{"eu"};
+    ApiUrl aApiUrl(kContentType, kRegion);
+    aApiUrl.setLocale("fr_FR");
+    aApiUrl.setGameMode("constructed");
+    aApiUrl.setPageSize("1");
+    std::uint64_t kNumberOfCards{aHearthstoneApi.numberOfCards(aHearthstoneApi.makeApiRequest(aApiUrl()))};
+    std::cout << std::format("Number of cards: {}", kNumberOfCards) << '\n';
 }
 
 TEST_CASE("Retrieve cards", "[retrieveCards]") {
@@ -50,5 +60,7 @@ TEST_CASE("Retrieve cards", "[retrieveCards]") {
     ApiUrl aApiUrl(kContentType, kRegion);
     aApiUrl.setLocale("fr_FR");
     aApiUrl.setGameMode("constructed");
-    std::cout << aHearthstoneApi.makeApiRequest(aApiUrl()) << '\n';
+    aApiUrl.setPageSize("10");
+    const std::string kApiResponse{aHearthstoneApi.makeApiRequest(aApiUrl())};
+    REQUIRE(kApiResponse.size() > 300);
 }