from fastapi import FastAPI, UploadFile, File, Query, HTTPException
from fastapi.middleware.cors import CORSMiddleware
import tempfile
import shutil
import os

from utils import check_image_nsfw, check_video_nsfw, download_file

app = FastAPI()

# ✅ CORS CONFIG
app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],  # 🔥 allow all (change later if needed)
    allow_credentials=True,
    allow_methods=["*"],
    allow_headers=["*"],
)

MAX_MB = 25


@app.get("/health")
def health():
    return {"status": "ok", "api": "live", "creator": "JerryCoder"}


# -----------------------------
# Save upload with size limit
# -----------------------------
def save_upload(file: UploadFile):
    tmp = tempfile.NamedTemporaryFile(delete=False)

    size = 0
    with open(tmp.name, "wb") as buffer:
        while chunk := file.file.read(1024 * 1024):
            size += len(chunk)

            if size > MAX_MB * 1024 * 1024:
                buffer.close()
                os.remove(tmp.name)
                raise HTTPException(413, "Max 25MB exceeded")

            buffer.write(chunk)

    return tmp.name


def is_video(name):
    return name.lower().endswith((".mp4", ".mov", ".avi", ".mkv", ".webm"))


def is_image(name):
    return name.lower().endswith((".jpg", ".jpeg", ".png", ".webp"))


# -----------------------------
# POST upload
# -----------------------------
@app.post("/detect")
async def detect(file: UploadFile = File(...)):
    path = save_upload(file)

    try:
        if is_image(file.filename):
            return {"type": "image", "nsfw": check_image_nsfw(path)}

        elif is_video(file.filename):
            return {"type": "video", "nsfw": check_video_nsfw(path)}

        else:
            raise HTTPException(400, "Unsupported file")

    finally:
        if os.path.exists(path):
            os.remove(path)


# -----------------------------
# GET URL
# -----------------------------
@app.get("/detect")
async def detect_url(url: str = Query(...)):
    try:
        path = download_file(url)
    except Exception:
        raise HTTPException(400, "Cannot fetch URL")

    try:
        size = os.path.getsize(path) / (1024 * 1024)

        if size > MAX_MB:
            raise HTTPException(413, "Max 25MB exceeded")

        if is_image(url):
            return {"type": "image", "nsfw": check_image_nsfw(path)}

        elif is_video(url):
            return {"type": "video", "nsfw": check_video_nsfw(path)}

        else:
            raise HTTPException(400, "Unsupported file")

    finally:
        if os.path.exists(path):
            os.remove(path)