"""FastAPI app for Bookly. Hosts /api/chat, /health, and the static chat UI."""

from __future__ import annotations

import logging

from fastapi import FastAPI, HTTPException
from fastapi.responses import RedirectResponse
from fastapi.staticfiles import StaticFiles
from pydantic import BaseModel, Field

import agent

logging.basicConfig(level=logging.INFO, format="%(asctime)s %(levelname)s %(name)s %(message)s")
logger = logging.getLogger("bookly.server")

app = FastAPI(title="Bookly", docs_url=None, redoc_url=None)


class ChatRequest(BaseModel):
    session_id: str = Field(..., min_length=1, max_length=128)
    message: str = Field(..., min_length=1, max_length=4000)


class ChatResponse(BaseModel):
    session_id: str
    reply: str


@app.get("/health")
def health() -> dict:
    return {"status": "ok"}


@app.get("/")
def root() -> RedirectResponse:
    return RedirectResponse(url="/static/index.html")


@app.post("/api/chat", response_model=ChatResponse)
def chat(request: ChatRequest) -> ChatResponse:
    try:
        reply = agent.run_turn(request.session_id, request.message)
    except Exception:
        logger.exception("chat_failed session=%s", request.session_id)
        raise HTTPException(status_code=500, detail="Something went wrong handling that message.")
    return ChatResponse(session_id=request.session_id, reply=reply)


app.mount("/static", StaticFiles(directory="static"), name="static")