#!/usr/bin/env bash

# Function to check if a command exists
check_dependency() {
    if ! command -v "$1" &> /dev/null; then
        echo "$1 is not installed. Installing..."
        sudo apt-get install -y "$1"
    else
        echo "$1 is already installed."
    fi
}

# Step 1: Finding the current working directory and script location
SCRIPT_DIR=$(pwd)
BASH_SCRIPT="$SCRIPT_DIR/battery_daemon.sh"
SRC_SCRIPT="$SCRIPT_DIR/battery_monitor"

# Check if battery_daemon.sh exists
if [[ -f "$BASH_SCRIPT" ]]; then
    echo "Found battery_daemon.sh. Moving to /usr/local/bin."
    sudo cp "$BASH_SCRIPT" /usr/local/bin/battery_daemon.sh
    sudo cp "$SRC_SCRIPT" /usr/local/bin/battery_monitor
    sudo chmod +x /usr/local/bin/battery_monitor
    sudo chmod +x /usr/local/bin/battery_daemon.sh
else
    echo "battery_daemon.sh not found in the current directory!"
    exit 1
fi

# Step 2: Check for dependencies and install if not present
dependencies=("gcc" "make" "brightnessctl")

for dep in "${dependencies[@]}"; do
    check_dependency "$dep"
done

# Step 3: Copy battery_monitor.service to user systemd folder
SYSTEMD_SERVICE="$SCRIPT_DIR/battery_monitor.service"
USER_SYSTEMD_DIR="$HOME/.config/systemd/user"

if [[ -f "$SYSTEMD_SERVICE" ]]; then
    echo "Found battery_monitor.service."
    
    # Create the user systemd directory if it doesn't exist
    if [[ ! -d "$USER_SYSTEMD_DIR" ]]; then
        echo "Creating user systemd directory: $USER_SYSTEMD_DIR"
        mkdir -p "$USER_SYSTEMD_DIR"
    fi
    
    echo "Copying battery_monitor.service to $USER_SYSTEMD_DIR"
    cp "$SYSTEMD_SERVICE" "$USER_SYSTEMD_DIR/"
else
    echo "battery_monitor.service not found in the current directory!"
    exit 1
fi

# Step 4: Reload the systemd daemon, enable and restart the service (user-level)
echo "Reloading systemd user daemon..."
systemctl --user daemon-reload

echo "Enabling battery_monitor.service..."
systemctl --user enable battery_monitor.service

echo "Restarting battery_monitor.service..."
systemctl --user restart battery_monitor.service

# Check if the service was successfully started
if systemctl --user is-active --quiet battery_monitor.service; then
    echo "Service started successfully!"
else
    echo "Failed to start the service."
    exit 1
fi