# frozen_string_literal: true

module DiscourseAi
  module AiBot
    class EntryPoint
      REQUIRE_TITLE_UPDATE = "discourse-ai-title-update"

      GPT4_ID = -110
      GPT3_5_TURBO_ID = -111
      CLAUDE_V2_ID = -112
      GPT4_TURBO_ID = -113
      MIXTRAL_ID = -114
      GEMINI_ID = -115
      FAKE_ID = -116 # only used for dev and test

      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"],
        [FAKE_ID, "fake_bot", "fake"],
      ]

      def self.map_bot_model_to_user_id(model_name)
        case model_name
        in "gpt-4-turbo"
          GPT4_TURBO_ID
        in "gpt-3.5-turbo"
          GPT3_5_TURBO_ID
        in "gpt-4"
          GPT4_ID
        in "claude-2"
          CLAUDE_V2_ID
        in "mixtral-8x7B-Instruct-V0.1"
          MIXTRAL_ID
        in "gemini-pro"
          GEMINI_ID
        in "fake"
          FAKE_ID
        else
          nil
        end
      end

      def inject_into(plugin)
        plugin.on(:site_setting_changed) do |name, _old_value, _new_value|
          if name == :ai_bot_enabled_chat_bots || name == :ai_bot_enabled ||
               name == :discourse_ai_enabled
            DiscourseAi::AiBot::SiteSettingsExtension.enable_or_disable_ai_bots
          end
        end

        plugin.register_seedfu_fixtures(
          Rails.root.join("plugins", "discourse-ai", "db", "fixtures", "ai_bot"),
        )

        plugin.add_to_serializer(
          :current_user,
          :ai_enabled_personas,
          include_condition: -> do
            SiteSetting.ai_bot_enabled && scope.authenticated? &&
              scope.user.in_any_groups?(SiteSetting.ai_bot_allowed_groups_map)
          end,
        ) do
          DiscourseAi::AiBot::Personas::Persona
            .all(user: scope.user)
            .map do |persona|
              { id: persona.id, name: persona.name, description: persona.description }
            end
        end

        plugin.add_to_serializer(
          :current_user,
          :ai_enabled_chat_bots,
          include_condition: -> do
            SiteSetting.ai_bot_enabled && scope.authenticated? &&
              scope.user.in_any_groups?(SiteSetting.ai_bot_allowed_groups_map)
          end,
        ) do
          model_map = {}
          SiteSetting
            .ai_bot_enabled_chat_bots
            .split("|")
            .each do |bot_name|
              model_map[
                ::DiscourseAi::AiBot::EntryPoint.map_bot_model_to_user_id(bot_name)
              ] = bot_name
            end

          # not 100% ideal, cause it is one extra query, but we need it
          bots = DB.query_hash(<<~SQL, user_ids: model_map.keys)
            SELECT username, id FROM users WHERE id IN (:user_ids)
          SQL

          bots.each { |hash| hash["model_name"] = model_map[hash["id"]] }
          bots
        end

        plugin.register_svg_icon("robot")

        plugin.add_to_serializer(
          :topic_view,
          :ai_persona_name,
          include_condition: -> { SiteSetting.ai_bot_enabled && object.topic.private_message? },
        ) do
          id = topic.custom_fields["ai_persona_id"]
          name =
            DiscourseAi::AiBot::Personas::Persona.find_by(user: scope.user, id: id.to_i)&.name if id
          name || topic.custom_fields["ai_persona"]
        end

        plugin.on(:post_created) do |post|
          bot_ids = BOTS.map(&:first)

          # Don't schedule a reply for a bot reply.
          if !bot_ids.include?(post.user_id)
            bot_user = post.topic.topic_allowed_users.where(user_id: bot_ids).first&.user
            bot = DiscourseAi::AiBot::Bot.as(bot_user)
            DiscourseAi::AiBot::Playground.new(bot).update_playground_with(post)
          end
        end

        if plugin.respond_to?(:register_editable_topic_custom_field)
          plugin.register_editable_topic_custom_field(:ai_persona_id)
        end
      end
    end
  end
end
