#!/usr/bin/env bash
# phone-timesync: Precision clock synchronization between t520 (Master) and Android (Slave)
# Fleet Techné 2026

TARGET_IP="192.168.1.103"
ADB_TARGET="192.168.1.103:5555"
MASTER_IP="192.168.1.100"

echo "[*] Ověřuji časovou synchronizaci telefonu s centrálními hodinami t520 ($MASTER_IP)..."

# 1. Connect wireless ADB if not already connected
if ! adb devices | grep -q "$TARGET_IP"; then
    adb connect "$ADB_TARGET" >/dev/null 2>&1
fi

# 2. Check current settings on Android
CURRENT_NTP=$(adb -s "$ADB_TARGET" shell settings get global ntp_server 2>/dev/null | tr -d '\r')
if [ "$CURRENT_NTP" != "$MASTER_IP" ]; then
    echo "[*] Nastavuji globální NTP server Androidu na $MASTER_IP..."
    adb -s "$ADB_TARGET" shell settings put global ntp_server "$MASTER_IP"
    adb -s "$ADB_TARGET" shell settings put global ntp_timeout 5000
else
    echo "[✓] Globální NTP server Androidu je nastaven na: $CURRENT_NTP"
fi

# 3. Query current time offset via Termux Python NTP query
python3 - << EOF
import socket, struct, time, sys

try:
    c = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
    c.settimeout(2.0)
    # Query Chrony on t520
    data = b'\x1b' + 47 * b'\0'
    t1 = time.time()
    c.sendto(data, ('$MASTER_IP', 123))
    data, _ = c.recvfrom(1024)
    t4 = time.time()
    unpacked = struct.unpack('!12I', data)
    t2 = unpacked[8] + float(unpacked[9]) / 2**32 - 2208988800
    t3 = unpacked[10] + float(unpacked[11]) / 2**32 - 2208988800
    rtt = (t4 - t1) - (t3 - t2)
    print(f"[✓] Stratum 1 Chrony na $MASTER_IP odpovídá (RTT: {rtt*1000:.2f} ms)")
except Exception as e:
    print(f"[-] Chyba dotazu na NTP: {e}")
EOF

# 4. Trigger NetworkTimeUpdateService resync on Android
adb -s "$ADB_TARGET" shell "cmd time_detector clear_network_time; cmd time_detector set_auto_detection_enabled false; sleep 0.2; cmd time_detector set_auto_detection_enabled true" >/dev/null 2>&1
echo "[✓] Služba time_detector na Androidu byla resetována a navázána na $MASTER_IP."