app.py

# app.py
import gradio as gr
import pydantic_ai.messages as pai_msg
from agent import agent, Deps


def extract_content(content) -> str:
    if isinstance(content, str):
        return content
    if isinstance(content, list):
        return " ".join(
            item.get("text", "") if isinstance(item, dict) else str(item)
            for item in content
        )
    return str(content or "")


def gradio_to_pydantic_history(history: list) -> list:
    print(f"[HISTORY] Recebido: {len(history)} itens")
    result = []

    for i, item in enumerate(history):
        try:
            role    = item.get("role", "")
            content = extract_content(item.get("content", ""))
            print(f"[HISTORY] Item {i}: role={role}, content='{content[:60]}'")

            if not content:
                continue

            if role == "user":
                result.append(pai_msg.ModelRequest(
                    parts=[pai_msg.UserPromptPart(content=content)]
                ))
            elif role == "assistant":
                result.append(pai_msg.ModelResponse(
                    parts=[pai_msg.TextPart(content=content)],
                    model_name="",
                ))
        except Exception as e:
            print(f"[HISTORY] Item {i} ERRO: {e}")

    print(f"[HISTORY] {len(result)} mensagens convertidas")
    return result


async def respond(message: str, history: list):
    print(f"\n{'='*50}")
    print(f"[RESPOND] Mensagem: '{message}' | History: {len(history)} itens")

    pydantic_history = gradio_to_pydantic_history(history)

    try:
        result = await agent.run(
            message,
            deps=Deps(),
            message_history=pydantic_history,
        )
        print(f"[AGENT] OK: '{result.output[:80]}'")
        yield result.output
    except Exception as e:
        print(f"[AGENT] ERRO: {type(e).__name__}: {e}")
        raise


CUSTOM_CSS = """
.buy-coffee {
    display: flex;
    justify-content: center;
    margin-top: 8px;
}
.buy-coffee a img {
    height: 40px;
    border-radius: 8px;
    transition: opacity 0.2s;
}
.buy-coffee a img:hover {
    opacity: 0.85;
}
"""

with gr.Blocks(css=CUSTOM_CSS) as demo:
    gr.ChatInterface(
        fn=respond,
        title="✈️ Agente de Viagens Brasil",
        description="Encontre as melhores passagens aéreas do Brasil. Ex: *'Quero ir de Salvador para São Paulo em abril'*",
        examples=[
            "Quero viajar de Salvador para São Paulo em abril. Quais as melhores passagens?",
            "Voos de Recife para Florianópolis, ida e volta, 2 adultos, saindo dia 10/05 voltando 17/05",
            "Qual o voo mais barato de Fortaleza para Brasília em maio?",
            "Quero ir de Vitória da Conquista para o Rio de Janeiro no fim de semana",
        ],
    )

    with gr.Row(elem_classes="buy-coffee"):
        gr.HTML("""
            <a href="https://ko-fi.com/fredcaixeta" target="_blank">
                <img src="https://ko-fi.com/img/githubbutton_sm.svg" alt="Buy Me a Coffee at ko-fi.com" />
            </a>
        """)


if __name__ == "__main__":
    demo.launch()