3 files changed, 202 insertions, 0 deletions
diff --git a/src/guestbook.cpp b/src/guestbook.cpp
new file mode 100644
index 0000000..0b58ddf
--- /dev/null
+++ b/src/guestbook.cpp
@@ -0,0 +1,78 @@
+#include "guestbook.hpp"
+#include "json.hpp"
+
+#include <filesystem>
+#include <fstream>
+#include <iostream>
+
+using json = nlohmann::json;
+
+namespace {
+    const std::filesystem::path guestbookFilePath = "data/guestbook.json";
+}
+
+std::vector<GuestbookEntry> loadGuestbook()
+{
+    std::ifstream file(guestbookFilePath);
+
+    if (!file.is_open())
+    {
+        return {};
+    }
+
+    if (file.peek() == std::ifstream::traits_type::eof())
+    {
+        return {};
+    }
+
+    // An existing but empty file is not valid JSON. Treat it like a new
+    // guestbook so a partially initialized data directory cannot crash the
+    // server during startup.
+    json data = json::parse(file, nullptr, false);
+
+    if (data.is_discarded() || !data.is_array())
+    {
+        std::cerr << "Warning: ignoring invalid guestbook data in "
+                  << guestbookFilePath << '\n';
+        return {};
+    }
+
+    std::vector<GuestbookEntry> entries;
+
+    for (const auto& item : data)
+    {
+        GuestbookEntry entry;
+        entry.name = item.at("name").get<std::string>();
+        entry.message = item.at("message").get<std::string>();
+
+        entries.push_back(entry);
+    }
+
+    return entries;
+}
+
+bool saveGuestbook(const std::vector<GuestbookEntry>& entries)
+{
+    std::filesystem::create_directories(guestbookFilePath.parent_path());
+
+    json data = json::array();
+
+    for (const GuestbookEntry& entry : entries)
+    {
+        data.push_back({
+            {"name", entry.name},
+            {"message", entry.message}
+        });
+    }
+
+    std::ofstream file(guestbookFilePath);
+
+    if (!file.is_open())
+    {
+        return false;
+    }
+
+    file << data.dump(4);
+
+    return true;
+}
diff --git a/src/main.cpp b/src/main.cpp
new file mode 100644
index 0000000..ad0214a
--- /dev/null
+++ b/src/main.cpp
@@ -0,0 +1,84 @@
+#include <iostream>
+#include "httplib.h"
+#include "views.hpp"
+#include "guestbook.hpp"
+#include "json.hpp"
+
+using json = nlohmann::json;
+
+int main()
+{
+    httplib::Server server;
+
+    int views = loadViews();
+    std::vector<GuestbookEntry> guestbook = loadGuestbook();
+
+    server.Get("/health", [](const httplib::Request& request, httplib::Response& response)
+    {
+        response.set_content("OK", "text/plain");
+    });
+
+    server.Get("/api/views", [&views](const httplib::Request& request, httplib::Response& response)
+    {
+        response.set_content(std::to_string(views), "text/plain");
+    });
+
+    server.Post("/api/views", [&views](const httplib::Request& request, httplib::Response& response)
+    {
+        const int newViews = views + 1;
+
+        if (!saveViews(newViews))
+        {
+            response.status = 500;
+            response.set_content("Failed to save views", "text/plain");
+            return;
+        }
+
+        views = newViews;
+        
+        response.set_content(std::to_string(views), "text/plain");
+    });
+
+    server.Get("/api/guestbook", [&guestbook](const httplib::Request& request, httplib::Response& response)
+    {
+        json data = json::array();
+
+        for (const GuestbookEntry& entry : guestbook)
+        {
+            data.push_back({
+                {"name", entry.name},
+                {"message", entry.message}
+            });
+        }
+
+        response.set_content(data.dump(), "application/json");
+    });
+
+    server.Post("/api/guestbook", [&guestbook](const httplib::Request& request, httplib::Response& response)
+    {
+        json body = json::parse(request.body);
+
+        GuestbookEntry entry;
+        entry.name = body.at("name").get<std::string>();
+        entry.message = body.at("message").get<std::string>();
+
+        guestbook.push_back(entry);
+
+        if (!saveGuestbook(guestbook))
+        {
+            response.status = 500;
+            response.set_content("Failed to save guestbook", "text/plain");
+            return;
+        }
+
+        response.status = 201;
+        response.set_content("Entry created", "text/plain");
+    });
+
+    std::cout << "Blog backend started\n";
+    std::cout << "Port: 8080\n";
+
+    server.listen("0.0.0.0", 8080);
+
+    return 0;
+}
+\ No newline at end of file
diff --git a/src/views.cpp b/src/views.cpp
new file mode 100644
index 0000000..f03d794
--- /dev/null
+++ b/src/views.cpp
@@ -0,0 +1,40 @@
+#include "views.hpp"
+
+#include <fstream>
+#include <filesystem>
+
+namespace {
+    const std::filesystem::path viewsFilePath = "data/views.txt";
+}
+
+int loadViews()
+{
+    std::ifstream file(viewsFilePath);
+
+    int views = 0;
+
+    if (!file.is_open())
+    {
+        return views;
+    }
+
+    file >> views;
+
+    return views;
+}
+
+bool saveViews(int views)
+{
+    //Create directory if doesn't exist
+    std::filesystem::create_directories(viewsFilePath.parent_path());
+    
+    std::ofstream file(viewsFilePath);
+
+    if (!file.is_open()) {
+        return false;
+    }
+
+    file << views;
+
+    return true;
+}
+\ No newline at end of file