#!/bin/bash

INI_FILE="/boot/kioskbrowser.ini"
REFRESH_INTERVAL=$(awk -F '=' '/^\[screen\]/ { in_screen=1; next }
                                in_screen && /^\[/ { in_screen=0 }
                                in_screen && $1 ~ /refresh_screen_every_x_min/ { gsub(/ /, "", $2); print $2 }' "$INI_FILE")

# Function to safely remount root FS
remount_root() {
    local mode=$1
    echo "Remounting root filesystem as $mode..."
    mount -o remount,"$mode" / || {
        echo "Failed to remount root as $mode"
        exit 1
    }
}

# Safely check if REFRESH_INTERVAL is a positive integer
if [[ "$REFRESH_INTERVAL" =~ ^[0-9]+$ ]] && (( REFRESH_INTERVAL > 0 )); then
    echo "Setting up screen refresh every $REFRESH_INTERVAL minutes..."

    SERVICE_UNIT="/etc/systemd/system/screen-refresh.service"
    TIMER_UNIT="/etc/systemd/system/screen-refresh.timer"

    # Remount as read-write
    remount_root rw

    # Write unit files
    cat <<EOF | tee "$SERVICE_UNIT" > /dev/null
[Unit]
Description=Refresh Screen
After=graphical.target

[Service]
Type=oneshot
User=pi
Environment=DISPLAY=:0
Environment=XAUTHORITY=/home/pi/.Xauthority
ExecStart=/usr/bin/refresh-screen
EOF

    cat <<EOF | tee "$TIMER_UNIT" > /dev/null
[Unit]
Description=Run screen refresh every $REFRESH_INTERVAL minutes

[Timer]
OnBootSec=1min
OnUnitActiveSec=${REFRESH_INTERVAL}min
Persistent=false

[Install]
WantedBy=timers.target
EOF

    # Reload and enable timer
    systemctl daemon-reload
    systemctl enable --now screen-refresh.timer

    # Remount as read-only
    remount_root ro

    echo "Screen refresh timer setup complete."
else
    echo "Invalid or missing refresh interval"
fi