"""Foodlinkk Email Agent — IMAP sync + CEO approval workflow."""
from __future__ import annotations

import asyncio
from contextlib import asynccontextmanager
from typing import Any

from fastapi import FastAPI, HTTPException
from pydantic import BaseModel, Field

from app.config import settings
from app.db import close_pool, fetch_one, init_pool
from app import imap_sync


class DraftIn(BaseModel):
    title: str = Field(..., min_length=3, max_length=255)
    to: str
    subject: str
    body: str


async def _sync_loop() -> None:
    while True:
        try:
            imap_sync.sync_all_accounts()
        except Exception:
            pass
        await asyncio.sleep(settings.SYNC_INTERVAL_SEC)


@asynccontextmanager
async def lifespan(app: FastAPI):
    init_pool()
    task = asyncio.create_task(_sync_loop())
    yield
    task.cancel()
    close_pool()


app = FastAPI(title="Foodlinkk Email Agent", version="1.0.0", lifespan=lifespan)


@app.get("/health")
def health() -> dict[str, Any]:
    db_ok = bool(fetch_one("SELECT 1 AS ok"))
    accounts = fetch_one(
        "SELECT COUNT(*) AS n FROM email_accounts WHERE is_active = TRUE AND sync_enabled = TRUE"
    )
    return {
        "status": "ok" if db_ok else "degraded",
        "database": "connected" if db_ok else "error",
        "imap_accounts": int((accounts or {}).get("n") or 0),
    }


@app.post("/sync")
def sync_now() -> dict[str, Any]:
    return imap_sync.sync_all_accounts()


@app.get("/drafts/pending")
def pending_drafts() -> dict[str, Any]:
    items = imap_sync.list_pending_drafts()
    return {"items": items, "count": len(items)}


@app.post("/drafts")
def create_draft(payload: DraftIn) -> dict[str, Any]:
    row = imap_sync.create_draft(payload.title, payload.body, payload.to, payload.subject)
    return {"draft": row}


@app.post("/drafts/{rec_id}/approve")
def approve_draft(rec_id: int) -> dict[str, Any]:
    try:
        return imap_sync.approve_draft(rec_id)
    except ValueError as exc:
        raise HTTPException(400, str(exc)) from exc
    except Exception as exc:  # noqa: BLE001
        raise HTTPException(502, str(exc)) from exc