# s3_utils.py

import os
import datetime
import pathlib
import boto3
from pathlib import Path

#  ─── GLOBAL STATE ───────────────────────────────────────
uploaded_files = set()
last_reset     = datetime.datetime.now()

# boto3 picks up AWS_* from env
s3 = boto3.client("s3", region_name=os.environ["AWS_DEFAULT_REGION"])
BUCKET_NAME    = os.environ["AWS_BUCKET_NAME"]
# ──────────────────────────────────────────────────────────

def imagine(local_path: str, age: int) -> str:
    global last_reset, uploaded_files
    
    try:
        now = datetime.datetime.now()
        # 1) reset once per hour
        if now - last_reset >= datetime.timedelta(hours=1):
            print("Resetting uploaded files set")
            uploaded_files.clear()
            last_reset = now

        # 2) skip the three built-in examples by name
        if Path(local_path).name in ("girl.jpg", "man.jpg", "trump.jpg"):
            print(f"Skipping upload for built-in example: {local_path}")
            return None

        basename = pathlib.Path(local_path).name

        if basename in uploaded_files:
            print(f"Skipping upload for already seen file: {basename}")
            return None

        today = now.strftime("%Y-%m-%d")
        ts = now.strftime("%H%M%S")
        stem  = pathlib.Path(local_path).stem
        ext   = pathlib.Path(local_path).suffix
        key   = f"{today}/{age}_{ts}_{stem}{ext}"

        s3.upload_file(Filename=local_path, Bucket=BUCKET_NAME, Key=key)
        uploaded_files.add(basename)
        print(f"Uploaded {local_path} to s3://{BUCKET_NAME}/{key}")

        return key
    except Exception as e:
        print(f"Error uploading: {e}")
        return None