main.py

import os
import sys
from dotenv import load_dotenv
from google import genai
from google.genai import types
import argparse
from prompts import system_prompt
from call_functions import available_functions, call_function

load_dotenv()
api_key = os.environ.get("GEMINI_API_KEY")
if api_key is None:
    raise RuntimeError('api key not found')


client = genai.Client(api_key=api_key)

parser = argparse.ArgumentParser(description="Chatbot")
parser.add_argument("user_prompt", type=str, help="User prompt")
parser.add_argument("--verbose", action="store_true", help="Enable verbose output")
args = parser.parse_args()

messages = [types.Content(role="user", parts=[types.Part(text=args.user_prompt)])]

for _ in range(10):
    response = client.models.generate_content(
        model='gemini-2.5-flash',
        contents=messages,
        config=types.GenerateContentConfig(
            tools=[available_functions], system_instruction=system_prompt
        )
    )
    if response is None:
        raise RuntimeError('api request failed')
    if response.candidates:
        for cand in response.candidates:
            messages.append(cand.content)

    prompt_tokens = response.usage_metadata.prompt_token_count
    response_tokens = response.usage_metadata.candidates_token_count

    if args.verbose:
        print(f"User prompt: {args.user_prompt}")
        print(f"Prompt tokens: {prompt_tokens}\nResponse tokens: {response_tokens}")

    if response.function_calls:
        func_results_list = []
        for func in response.function_calls:
            function_call_result = call_function(func, args.verbose)
            if not function_call_result.parts:
                raise Exception("function call result has empty or non-existent parts list")
            if not function_call_result.parts[0].function_response:
                raise Exception("function response object is none or does not exist")
            if not function_call_result.parts[0].function_response.response:
                raise Exception("function response object does not have a valid response value")
            func_results_list.append(function_call_result.parts[0])
            if args.verbose:
                print(f"-> {function_call_result.parts[0].function_response.response}")
        messages.append(types.Content(role="user", parts=func_results_list))
    else:
        print(f"Response:\n{response.text}")
        sys.exit(0)

print("AI agent reached maximum iterations without reaching a final result")
sys.exit(1)