import os
import glob
import logging
import threading
import tempfile
import asyncio
from contextlib import asynccontextmanager
from fastapi import FastAPI, Request, Query, HTTPException, UploadFile, File, Form
from fastapi.responses import HTMLResponse, RedirectResponse
from fastapi.staticfiles import StaticFiles
from fastapi.templating import Jinja2Templates
from datetime import datetime

import database
import watcher

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

SNAPSHOTS_DIR = os.environ.get("SNAPSHOTS_DIR", "/data/snapshots")
EVENTS_DIR = os.environ.get("EVENTS_DIR", "/data/events")
os.makedirs(SNAPSHOTS_DIR, exist_ok=True)
os.makedirs(EVENTS_DIR, exist_ok=True)


@asynccontextmanager
async def lifespan(app: FastAPI):
    database.init_db()
    t = threading.Thread(target=watcher.run_watcher, daemon=True)
    t.start()
    yield


app = FastAPI(lifespan=lifespan)
app.mount("/snapshots", StaticFiles(directory=SNAPSHOTS_DIR), name="snapshots")
app.mount("/events", StaticFiles(directory=EVENTS_DIR), name="events")

templates = Jinja2Templates(directory="/app/templates")


def ts_to_str(ts):
    try:
        return datetime.fromtimestamp(ts).strftime("%d/%m/%Y %H:%M:%S")
    except Exception:
        return str(ts)


@app.get("/", response_class=HTMLResponse)
async def index(
    request: Request,
    page: int = Query(1, ge=1),
    plate: str = Query(""),
    camera: str = Query(""),
    date: str = Query(""),
):
    limit = 20
    offset = (page - 1) * limit
    events = database.get_events(limit=limit, offset=offset,
                                  plate_filter=plate or None,
                                  camera_filter=camera or None,
                                  date_filter=date or None)
    total = database.count_events(plate_filter=plate or None,
                                   camera_filter=camera or None,
                                   date_filter=date or None)
    cameras = database.get_cameras()
    total_pages = max(1, (total + limit - 1) // limit)

    for ev in events:
        ev["time_str"] = ts_to_str(ev["start_time"])

    return templates.TemplateResponse("index.html", {
        "request": request,
        "events": events,
        "total": total,
        "page": page,
        "total_pages": total_pages,
        "cameras": cameras,
        "filter_plate": plate,
        "filter_camera": camera,
        "filter_date": date,
    })


CAPTURE_DURATION = int(os.environ.get("CAPTURE_DURATION", "15"))
CAPTURE_FPS = int(os.environ.get("CAPTURE_FPS", "5"))


@app.get("/event/{event_id}", response_class=HTMLResponse)
async def event_detail(request: Request, event_id: str):
    ev = database.get_event(event_id)
    if not ev:
        raise HTTPException(status_code=404, detail="Événement introuvable")

    ev["time_str"] = ts_to_str(ev["start_time"])

    event_dir = os.path.join(EVENTS_DIR, event_id)
    frame_paths = sorted(glob.glob(os.path.join(event_dir, "frame_*.jpg")))
    frames = [f"events/{event_id}/{os.path.basename(p)}" for p in frame_paths]

    clip_abs = os.path.join("/data", ev["clip_path"]) if ev.get("clip_path") else None
    has_clip = bool(clip_abs and os.path.exists(clip_abs))
    clip_size = ""
    if has_clip:
        size = os.path.getsize(clip_abs)
        clip_size = f"{size // 1024 // 1024}MB" if size > 1024 * 1024 else f"{size // 1024}KB"

    plate_crop_abs = os.path.join(event_dir, "plate_crop.jpg")
    plate_crop = f"events/{event_id}/plate_crop.jpg" if os.path.exists(plate_crop_abs) else None

    return templates.TemplateResponse("event_detail.html", {
        "request": request,
        "ev": ev,
        "frames": frames,
        "has_clip": has_clip,
        "clip_size": clip_size,
        "plate_crop": plate_crop,
        "capture_duration": CAPTURE_DURATION,
        "capture_fps": CAPTURE_FPS,
        "capture_total": CAPTURE_DURATION * CAPTURE_FPS,
    })


@app.get("/api/events")
async def api_events(
    page: int = Query(1, ge=1),
    plate: str = Query(""),
    camera: str = Query(""),
    date: str = Query(""),
):
    limit = 20
    offset = (page - 1) * limit
    events = database.get_events(limit=limit, offset=offset,
                                  plate_filter=plate or None,
                                  camera_filter=camera or None,
                                  date_filter=date or None)
    total = database.count_events(plate_filter=plate or None,
                                   camera_filter=camera or None,
                                   date_filter=date or None)
    for ev in events:
        ev["time_str"] = ts_to_str(ev["start_time"])
    return {"events": events, "total": total}


@app.post("/event/{event_id}/plate")
async def update_plate(event_id: str, plate: str = Form("")):
    ev = database.get_event(event_id)
    if not ev:
        raise HTTPException(status_code=404, detail="Événement introuvable")
    database.update_plate(event_id, plate)
    return RedirectResponse(f"/event/{event_id}", status_code=303)


@app.post("/upload")
async def upload_clip(file: UploadFile = File(...)):
    if not file.filename.lower().endswith(".mp4"):
        raise HTTPException(status_code=400, detail="Seuls les fichiers .mp4 sont acceptés")

    with tempfile.NamedTemporaryFile(suffix=".mp4", delete=False) as tmp:
        content = await file.read()
        tmp.write(content)
        tmp_path = tmp.name

    try:
        loop = asyncio.get_event_loop()
        event_id = await loop.run_in_executor(None, watcher.process_uploaded_clip, tmp_path)
    finally:
        os.unlink(tmp_path)

    return RedirectResponse(f"/event/{event_id}", status_code=303)


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