from __future__ import annotations

import json
import os
from datetime import datetime, timezone
from pathlib import Path
from typing import Any, Dict, List, Optional

from fastapi import FastAPI, Query
from fastapi.responses import HTMLResponse, JSONResponse
from fastapi.staticfiles import StaticFiles

from .updater import ensure_monthly_refresh, load_events, query_events

ROOT = Path(__file__).resolve().parents[1]
DATA_DIR = ROOT / "data"
STATIC_DIR = ROOT / "static"

app = FastAPI(title="AI Timeline", version="0.1.0")

# Serve the SPA
app.mount("/static", StaticFiles(directory=str(STATIC_DIR)), name="static")

@app.get("/", response_class=HTMLResponse)
def index() -> HTMLResponse:
    return HTMLResponse((STATIC_DIR / "index.html").read_text(encoding="utf-8"))

@app.get("/api/events")
def api_events(
    q: Optional[str] = Query(default=None, description="Full-text search (title/description/org)."),
    category: Optional[str] = Query(default=None, description="open-weights | api | all"),
    org: Optional[str] = Query(default=None, description="Filter by org/author (HF)."),
    date_from: Optional[str] = Query(default=None, description="YYYY-MM-DD"),
    date_to: Optional[str] = Query(default=None, description="YYYY-MM-DD"),
) -> JSONResponse:
    """
    Returns events for the timeline.
    Refresh logic: on every request we *cheap-check* whether the month changed since last refresh.
    If yes, we refresh the Hugging Face portion (open-weight models) and merge into events.json.
    """
    ensure_monthly_refresh(data_dir=DATA_DIR)

    payload = load_events(DATA_DIR)
    events = query_events(
        payload["events"],
        q=q,
        category=category,
        org=org,
        date_from=date_from,
        date_to=date_to,
    )
    return JSONResponse(
        {
            "as_of": datetime.now(timezone.utc).isoformat(),
            "count": len(events),
            "events": events,
            "meta": {
                "tracked_orgs": payload.get("tracked_orgs", []),
                "last_refresh_month": payload.get("last_refresh_month"),
                "last_refresh_at": payload.get("last_refresh_at"),
            },
        }
    )