#!/bin/sh
# Automatically update the timezone whenever NetworkManager detects a connectivity change.
# Uses `connectivity-change` instead of `up` to avoid conflicts with VPN connections.
# Ensures the system has the correct timezone to mitigate potential signature verification errors.

# Dependencies: `curl`, `timedatectl`
# Reference: https://wiki.archlinux.org/title/Pacman/Package_signing#Invalid_signature_errors

# Function to log errors
log_error() {
    echo "[ERROR] $1" >&2
}

# Check if required commands are available
command -v curl >/dev/null 2>&1 || {
    log_error "curl is not installed. Please install it and try again."
    exit 1
}

command -v timedatectl >/dev/null 2>&1 || {
    log_error "timedatectl is not available. Ensure systemd is being used."
    exit 1
}

# Main logic
case "$2" in
    connectivity-change)
        # Fetch the timezone using ipapi.co
        TIMEZONE=$(curl --fail --silent --retry 3 https://ipapi.co/timezone)
        if [ -n "$TIMEZONE" ]; then
            # Set the timezone if fetched successfully
            timedatectl set-timezone "$TIMEZONE" || log_error "Failed to set timezone to $TIMEZONE."
        else
            log_error "Failed to fetch timezone. Ensure your internet connection is active."
        fi
    ;;
    *)
        # No action needed for other events
        exit 0
    ;;
esac