import random
import sys
from datetime import datetime, timezone

try:
    import requests
except ImportError:
    sys.exit("Erreur : install requests (pip install requests)")

# ---------------------------------------------------------------------------
# CONFIG — à adapter
# ---------------------------------------------------------------------------
CONFIG = {
    
    "BACKEND_URL": "http://127.0.0.1:5000/api/ingest",

    "DEVICE_ID": "esp32-01",
    "DEVICE_SECRET": "demo-secret-esp32-01",  # correspond au backend

    # Simulation de la LDR 
    "LIGHT_MIN": 0,
    "LIGHT_MAX": 4095,

    "SEND_INTERVAL": 60,   # secondes entre envois
    "DRY_RUN": False,      # True : affiche le payload sans l'envoyer
}


# ---------------------------------------------------------------------------
# Lecture simulée 
# ---------------------------------------------------------------------------
def read_light():
    """Retourne une valeur brute simulée, bornée (0..4095 par défaut)."""
    return random.randint(CONFIG["LIGHT_MIN"], CONFIG["LIGHT_MAX"])


# ---------------------------------------------------------------------------
# Payload JSON 
# ---------------------------------------------------------------------------
def build_payload(raw_value):
    return {
        "device_id": CONFIG["DEVICE_ID"],
        "timestamp": datetime.now(timezone.utc).isoformat(),
        "light_value": int(raw_value),
    }


# ---------------------------------------------------------------------------
# Envoi 
# ---------------------------------------------------------------------------
def send_measure(payload):
    headers = {
        "Content-Type": "application/json",
        "X-Device-ID": CONFIG["DEVICE_ID"],
        "X-Device-Secret": CONFIG["DEVICE_SECRET"],
    }
    try:
        resp = requests.post(CONFIG["BACKEND_URL"], json=payload,
                             headers=headers, timeout=10)
        print("[send] device={} status={} ok={}".format(
            CONFIG["DEVICE_ID"], resp.status_code,
            200 <= resp.status_code < 300))
        return resp.status_code, (200 <= resp.status_code < 300)
    except requests.exceptions.RequestException as exc:
        print("[http] erreur envoi (device={}) : {}".format(
            CONFIG["DEVICE_ID"], type(exc).__name__))
        return None, False


# ---------------------------------------------------------------------------
# Boucle
# ---------------------------------------------------------------------------
def main():
    dry_run = CONFIG["DRY_RUN"] or "--dry-run" in sys.argv

    if dry_run:
        print("[dry-run] payload :", build_payload(read_light()))
        return

    while True:
        raw = read_light()
        send_measure(build_payload(raw))
        print("  (prochain envoi dans {} s)".format(CONFIG["SEND_INTERVAL"]))
        time.sleep(CONFIG["SEND_INTERVAL"])


if __name__ == "__main__":
    import time
    main()