import { LLM_CONFIG } from "../../config/llm.js";
import { OpenAiCompatibleAdapter } from "./openai-compatible.js";
import { GeminiAdapter } from "./gemini.js";
import type { LlmAdapter } from "./types.js";

export function createAdapter(): LlmAdapter {
  switch (LLM_CONFIG.provider) {
    case "local":
      return new OpenAiCompatibleAdapter(
        LLM_CONFIG.url,
        undefined,
        LLM_CONFIG.model,
      );
    case "openrouter":
      return new OpenAiCompatibleAdapter(
        LLM_CONFIG.url,
        process.env["OPENROUTER_API_KEY"],
        LLM_CONFIG.model,
      );
    case "deepseek":
      return new OpenAiCompatibleAdapter(
        LLM_CONFIG.url,
        process.env["DEEPSEEK_API_KEY"],
        LLM_CONFIG.model,
      );
    case "groq":
      return new OpenAiCompatibleAdapter(
        LLM_CONFIG.url,
        process.env["GROQ_API_KEY"],
        LLM_CONFIG.model,
      );
    case "gemini": {
      const apiKey = process.env["GEMINI_API_KEY"];
      if (!apiKey) throw new Error("GEMINI_API_KEY env var not set");
      if (!LLM_CONFIG.model)
        throw new Error("LLM_CONFIG.model required for gemini");
      return new GeminiAdapter(apiKey, LLM_CONFIG.model);
    }
    default:
      throw new Error(`Unknown provider: ${LLM_CONFIG.provider as string}`);
  }
}