# frozen_string_literal: true

class DiscourseAi::Evals::Llm
  CONFIGS = {
    "gpt-4o" => {
      display_name: "GPT-4o",
      name: "gpt-4o",
      tokenizer: "DiscourseAi::Tokenizer::OpenAiTokenizer",
      api_key_env: "OPENAI_API_KEY",
      provider: "open_ai",
      url: "https://api.openai.com/v1/chat/completions",
      max_prompt_tokens: 131_072,
      vision_enabled: true,
    },
    "gpt-4o-mini" => {
      display_name: "GPT-4o-mini",
      name: "gpt-4o-mini",
      tokenizer: "DiscourseAi::Tokenizer::OpenAiTokenizer",
      api_key_env: "OPENAI_API_KEY",
      provider: "open_ai",
      url: "https://api.openai.com/v1/chat/completions",
      max_prompt_tokens: 131_072,
      vision_enabled: true,
    },
    "claude-3.5-haiku" => {
      display_name: "Claude 3.5 Haiku",
      name: "claude-3-5-haiku-latest",
      tokenizer: "DiscourseAi::Tokenizer::AnthropicTokenizer",
      api_key_env: "ANTHROPIC_API_KEY",
      provider: "anthropic",
      url: "https://api.anthropic.com/v1/messages",
      max_prompt_tokens: 200_000,
      vision_enabled: false,
    },
    "claude-3.5-sonnet" => {
      display_name: "Claude 3.5 Sonnet",
      name: "claude-3-5-sonnet-latest",
      tokenizer: "DiscourseAi::Tokenizer::AnthropicTokenizer",
      api_key_env: "ANTHROPIC_API_KEY",
      provider: "anthropic",
      url: "https://api.anthropic.com/v1/messages",
      max_prompt_tokens: 200_000,
      vision_enabled: true,
    },
    "gemini-2.0-flash" => {
      display_name: "Gemini 2.0 Flash",
      name: "gemini-2-0-flash",
      tokenizer: "DiscourseAi::Tokenizer::GeminiTokenizer",
      api_key_env: "GEMINI_API_KEY",
      provider: "google",
      url: "https://generativelanguage.googleapis.com/v1beta/models/gemini-2.0-flash",
      max_prompt_tokens: 1_000_000,
      vision_enabled: true,
    },
    "gemini-2.0-pro-exp" => {
      display_name: "Gemini 2.0 pro",
      name: "gemini-2-0-pro-exp",
      tokenizer: "DiscourseAi::Tokenizer::GeminiTokenizer",
      api_key_env: "GEMINI_API_KEY",
      provider: "google",
      url: "https://generativelanguage.googleapis.com/v1beta/models/gemini-2.0-pro-exp",
      max_prompt_tokens: 1_000_000,
      vision_enabled: true,
    },
  }

  def self.print
    CONFIGS
      .keys
      .map do |config_name|
        begin
          new(config_name)
        rescue StandardError
          nil
        end
      end
      .compact
      .each { |llm| puts "#{llm.config_name}: #{llm.name} (#{llm.provider})" }
  end

  def self.choose(config_name)
    if CONFIGS[config_name].nil?
      CONFIGS
        .keys
        .map do |config_name|
          begin
            new(config_name)
          rescue => e
            puts "Error initializing #{config_name}: #{e}"
            nil
          end
        end
        .compact
    elsif !CONFIGS.include?(config_name)
      raise "Invalid llm"
    else
      [new(config_name)]
    end
  end

  attr_reader :llm_model
  attr_reader :llm_proxy
  attr_reader :config_name

  def initialize(config_name)
    config = CONFIGS[config_name].dup
    api_key_env = config.delete(:api_key_env)
    if !ENV[api_key_env]
      raise "Missing API key for #{config_name}, should be set via #{api_key_env}"
    end

    config[:api_key] = ENV[api_key_env]
    @llm_model = LlmModel.new(config)
    @llm_proxy = DiscourseAi::Completions::Llm.proxy(@llm_model)
    @config_name = config_name
  end

  def provider
    @llm_model.provider
  end

  def name
    @llm_model.display_name
  end

  def vision?
    @llm_model.vision_enabled
  end
end