import logging
from collections.abc import AsyncIterable
from pathlib import Path

from fastapi import FastAPI
from fastapi.responses import FileResponse
from fastapi.staticfiles import StaticFiles

from app.agent import MODEL, run_agent
from app.models import AgentRequest, TextChunk

logging.basicConfig(
    level=logging.INFO,
    format="%(asctime)s %(levelname)s %(name)s: %(message)s",
)

logger = logging.getLogger(__name__)

app = FastAPI()

_STATIC = Path(__file__).parent / "static"
app.mount("/static", StaticFiles(directory=_STATIC), name="static")


@app.get("/config")
async def config():
    return {"model": MODEL}


@app.get("/")
async def index() -> FileResponse:
    return FileResponse(_STATIC / "index.html")


@app.post("/agent")
async def handle_agent_call(request: AgentRequest) -> AsyncIterable[TextChunk]:
    try:
        async for chunk in run_agent(request.input):
            yield chunk
    except Exception as exc:
        logger.exception("Agent error during streaming")
        yield TextChunk(type="error", content=str(exc))