Add /gemini command

README.md

@@ -12,9 +12,12 @@ If DPP is installed in a different location you can specify the root directory t
 cmake .. -DDPP_ROOT_DIR=<your-path>
 ```
 ## Running the bot
-Create a config.json in the directory above the build directory:
+Create a config.json in the directory above the `build` directory :
 ```json
-{ "token": "your bot token here" }
+{ 
+  "token": "your bot token here",
+  "gemini": "your gemini api key here"
+}
 ```
 Start the bot :
 ```bash

src/main.cpp

@@ -8,13 +8,58 @@ int main(int argc, char const *argv[]) {
     configfile >> configdocument;
 
     const std::string BOT_TOKEN = configdocument["token"];
+    const std::string GEMINI_KEY = configdocument["gemini"];
+
     dpp::cluster bot(BOT_TOKEN, dpp::i_default_intents | dpp::i_guild_members);
 
     bot.on_log(dpp::utility::cout_logger());
 
-    bot.on_slashcommand([](const dpp::slashcommand_t& event) {
+    bot.on_slashcommand([&bot, GEMINI_KEY](const dpp::slashcommand_t& event) {
         if (event.command.get_command_name() == "ping") {
             event.reply("Pong!");
+            return;
+        } else if (event.command.get_command_name() == "gemini") {
+            std::string prompt = std::get<std::string>(
+                event.get_parameter("prompt")
+            );
+            json payload = {{
+                    "contents", json::array({{
+                            {
+                                "role", "user"
+                            },
+                            {
+                                "parts", json::array({
+                                    { { "text", prompt } }
+                                })
+                            }
+                        }
+                    })
+                }
+            };
+            std::string postdata = payload.dump();
+            event.thinking();
+            bot.request("https://generativelanguage.googleapis.com/v1beta/models/gemini-2.5-flash:generateContent", dpp::m_post,
+                [&bot, event, GEMINI_KEY](const dpp::http_request_completion_t& cc) {
+                    if (cc.status != 200) {
+                        event.edit_original_response(
+                            dpp::message(std::to_string(cc.status))
+                        );
+                        return;
+                    }
+                    json response = json::parse(cc.body, nullptr, false);
+                    std::string reply = response["candidates"][0]["content"]["parts"][0]["text"];
+                    if (reply.size() > 2000) {
+                        reply = reply.substr(0, 2000);
+                    }
+                    event.edit_original_response(
+                        dpp::message(reply)
+                    );
+                },
+                postdata,
+                "application/json", {
+                    { "x-goog-api-key", GEMINI_KEY }
+                }
+            );
         }
     });
 
@@ -60,6 +105,9 @@ int main(int argc, char const *argv[]) {
     bot.on_ready([&bot](const dpp::ready_t& event) {
         if (dpp::run_once<struct register_bot_commands>()) {
             bot.global_command_create(dpp::slashcommand("ping", "Ping pong!", bot.me.id));
+
+            bot.global_command_create(dpp::slashcommand("gemini", "Ask gemini-2.5-flash.", bot.me.id)
+                .add_option(dpp::command_option(dpp::co_string, "prompt", "What you want to ask.", true)));
         }
     });