"""
boot.py — runs before main.py on every ESP32 boot

Connects WiFi, runs OTA update, then hands off to main.py.
Keep this file as simple as possible — it is never OTA-updated itself
(it lives outside the repo folder) so bugs here require USB to fix.
"""

import network
import utime
import sys

import ota

ota.load_config()
WIFI_SSID, WIFI_PASSWORD = ota.WIFI_SSID, ota.WIFI_PASSWORD

def _connect_wifi(timeout_s=20):
    sta = network.WLAN(network.STA_IF)
    sta.active(True)
    sta.config(txpower=15)
    if sta.isconnected():
        return True
    sta.connect(WIFI_SSID, WIFI_PASSWORD)
    deadline = utime.time() + timeout_s
    while not sta.isconnected():
        if utime.time() > deadline:
            return False
        utime.sleep_ms(300)
    return True

if WIFI_SSID is None:
    print("[boot] No WiFi credentials — cannot connect, skipping OTA")
elif _connect_wifi():
    ip = network.WLAN(network.STA_IF).ifconfig()[0]
    print(f"[boot] WiFi connected — {ip}")

    try:
        ota.update()
    except Exception as e:
        print(f"[boot] OTA error: {e} — continuing with existing files")
        sys.print_exception(e)
else:
    print("[boot] WiFi failed — skipping OTA, booting with existing files")

# main.py runs automatically after boot.py