FEATURE: AI Bot Gemini support. (#402)

It also corrects the syntax around tool support, which was wrong.

Gemini doesn't want us to include messages about previous tool invocations, so I had to shuffle around some code to send the response it generated from those invocations instead. For this, I created the "multi_turn" context, which bundles all the context involved in the interaction.

lib/ai_bot/bot.rb

@@ -125,6 +125,8 @@ module DiscourseAi
             "gpt-3.5-turbo-16k"
           when DiscourseAi::AiBot::EntryPoint::MIXTRAL_ID
             "mistralai/Mixtral-8x7B-Instruct-v0.1"
+          when DiscourseAi::AiBot::EntryPoint::GEMINI_ID
+            "gemini-pro"
           else
             nil
           end
@@ -146,9 +148,10 @@ module DiscourseAi
           <summary>#{summary}</summary>
           <p>#{details}</p>
         </details>
+
         HTML
 
-        placeholder << custom_raw << "\n" if custom_raw
+        placeholder << custom_raw if custom_raw
 
         placeholder
       end

lib/ai_bot/entry_point.rb

@@ -10,12 +10,14 @@ module DiscourseAi
       CLAUDE_V2_ID = -112
       GPT4_TURBO_ID = -113
       MIXTRAL_ID = -114
+      GEMINI_ID = -115
       BOTS = [
         [GPT4_ID, "gpt4_bot", "gpt-4"],
         [GPT3_5_TURBO_ID, "gpt3.5_bot", "gpt-3.5-turbo"],
         [CLAUDE_V2_ID, "claude_bot", "claude-2"],
         [GPT4_TURBO_ID, "gpt4t_bot", "gpt-4-turbo"],
         [MIXTRAL_ID, "mixtral_bot", "mixtral-8x7B-Instruct-V0.1"],
+        [GEMINI_ID, "gemini_bot", "gemini-pro"],
       ]
 
       def self.map_bot_model_to_user_id(model_name)
@@ -30,6 +32,8 @@ module DiscourseAi
           CLAUDE_V2_ID
         in "mixtral-8x7B-Instruct-V0.1"
           MIXTRAL_ID
+        in "gemini-pro"
+          GEMINI_ID
         else
           nil
         end

lib/ai_bot/playground.rb

@@ -37,7 +37,6 @@ module DiscourseAi
 
         result = []
 
-        first = true
         context.each do |raw, username, custom_prompt|
           custom_prompt_translation =
             Proc.new do |message|
@@ -51,25 +50,22 @@ module DiscourseAi
 
                 custom_context[:name] = message[1] if custom_context[:type] != "assistant"
 
-                result << custom_context
+                custom_context
               end
             end
 
           if custom_prompt.present?
-            if first
-              custom_prompt.reverse_each(&custom_prompt_translation)
-              first = false
-            else
-              tool_call_and_tool = custom_prompt.first(2)
-              tool_call_and_tool.reverse_each(&custom_prompt_translation)
-            end
+            result << {
+              type: "multi_turn",
+              content: custom_prompt.reverse_each.map(&custom_prompt_translation).compact,
+            }
           else
             context = {
               content: raw,
               type: (available_bot_usernames.include?(username) ? "assistant" : "user"),
             }
 
-            context[:name] = username if context[:type] == "user"
+            context[:name] = clean_username(username) if context[:type] == "user"
 
             result << context
           end