#!/bin/bash

# ANSI color codes
GREEN='\033[0;32m'
ORANGE='\033[0;33m'
CYAN='\033[0;36m'
NC='\033[0m' # No Color

# Warn with a prompt if we're running as root
if [ "$EUID" -eq 0 ]; then
    echo -e "${ORANGE}WARNING: You are running this script as root. It is recommended to run this script as a non-root user.${NC}"
    echo -e "${ORANGE}Do you want to continue? (y/n)${NC}"
    read choice

    if [ "$choice" != "y" ] && [ "$choice" != "Y" ]; then
        echo -e "${ORANGE}Aborting installation.${NC}"
        exit 1
    fi
fi

# CD to project root if we're in the scripts dir
current_dir=$(pwd)
if [ "$(basename "$current_dir")" = "scripts" ]; then
    cd ..
fi

#
# Python version verification
#
if ! command -v python3 &>/dev/null; then
    echo -e "${ORANGE}Python 3 is not installed or not found. Please install at least Python 3.9 before you continue.${NC}"
    exit 1
fi

python_version=$(python3 --version) || exit 1
version_number=$(echo "$python_version" | awk '{print $2}')
IFS='.' read -r major minor patch <<< "$version_number"

if [[ "$major" -eq 3 && "$minor" -ge 9 ]]; then
    echo -e "${GREEN}Python 3.9 or later is installed (Current version: $version_number)${NC}"
else
    if [[ -f /etc/os-release ]]; then
        source /etc/os-release
        if [[ "$VERSION_CODENAME" == "buster" ]]; then
            echo -e "${ORANGE}Python 3.9 or later is not installed (Current version: $version_number)${NC}"
            echo -e "${ORANGE}You are running an outdated version of Debian/Raspbian (Buster). If you upgrade to Bullseye, you will get the correct python version. Please see guides online on how to upgrade your operating system.${NC}"
            exit 1
        fi
    fi
    echo -e "${ORANGE}Current version of Python ($version_number) is too old for Spoolman.${NC}"
    echo -e "${ORANGE}Please look up how to install Python 3.9 or later for your specific operating system.${NC}"
    exit 1
fi
#
# Get os package manager
#
if [[ -f /etc/os-release ]]; then
    source /etc/os-release
    if [[ "$ID_LIKE" == *"debian"* ]]; then
        pkg_manager="apt-get"
        update_cmd="sudo $pkg_manager update"
        install_cmd="sudo $pkg_manager install -y"
        echo -e "${GREEN}Detected Debian-based system. Using apt-get package manager.${NC}"
    elif [[ "$ID_LIKE" == *"arch"* ]]; then
        pkg_manager="pacman"
        update_cmd="sudo $pkg_manager -Sy"
        install_cmd="sudo $pkg_manager -S --noconfirm"
        echo -e "${GREEN}Detected Arch-based system. Using pacman package manager.${NC}"
    else
        echo -e "${ORANGE}Your operating system is not supported. Either try to install manually or reach out to spoolman github for support.${NC}"
        exit 1
    fi
fi

# Run pkg manager update
echo -e "${GREEN}Updating $pkg_manager cache...${NC}"
$update_cmd || exit 1
packages=""
if ! python3 -c 'import venv, ensurepip' &>/dev/null; then
    echo -e "${ORANGE}Python venv module is not accessible. Installing venv...${NC}"
    if [[ "$pkg_manager" == "apt-get" ]]; then
        packages+="python3-venv"
    elif [[ "$pkg_manager" == "pacman" ]]; then
        packages+="python-virtualenv"
    fi
fi

if ! command -v pip3 &>/dev/null; then
    echo -e "${ORANGE}Python pip is not installed. Installing pip...${NC}"
    if [[ "$pkg_manager" == "apt-get" ]]; then
        packages+="python3-pip"
    elif [[ "$pkg_manager" == "pacman" ]]; then
        packages+="python-pip"
    fi
fi

if ! command -v pg_config &>/dev/null; then
    echo -e "${ORANGE}pg_config is not available. Installing libpq-dev...${NC}"
    if [[ "$pkg_manager" == "apt-get" ]]; then
        packages+="libpq-dev"
    elif [[ "$pkg_manager" == "pacman" ]]; then
        packages+="postgresql-libs"
    fi
fi

if ! command -v unzip &>/dev/null; then
    echo -e "${ORANGE}unzip is not available. Installing unzip...${NC}"
    packages+="unzip"
fi

if [[ -n "$packages" ]]; then
    $install_cmd $packages || exit 1
fi

#
# Update pip
#
echo -e "${GREEN}Updating pip...${NC}"

# Run pip upgrade command and capture stdout
upgrade_output=$(python3 -m pip install --user --upgrade pip 2>&1)
exit_code=$?

# Check if the upgrade command failed and contains the specified error message
is_externally_managed_env=$(echo "$upgrade_output" | grep "error: externally-managed-environment")
if [[ $exit_code -ne 0 ]]; then
    if [[ $is_externally_managed_env ]]; then
        echo -e "${GREEN}Warning:${NC} Failed to upgrade pip since it's version is managed by the OS. Continuing anyway..."
    else
        echo -e "${GREEN}Error:${NC} Pip upgrade failed with exit code $exit_code and the following output:"
        echo "$upgrade_output"
        exit 1
    fi
else
    echo -e "${GREEN}Pip updated successfully.${NC}"
fi

#
# Install various pip packages if needed
#
echo -e "${GREEN}Installing system-wide pip packages needed for Spoolman...${NC}"
if [[ $is_externally_managed_env ]]; then
    echo -e "${GREEN}Installing the packages using apt-get instead of pip since pip is externally managed...${NC}"
    if [[ "$pkg_manager" == "apt-get" ]]; then
        packages="python3-setuptools python3-wheel"
    elif [[ "$pkg_manager" == "pacman" ]]; then
        packages="python-setuptools python-wheel"
    fi
    $install_cmd $packages || exit 1
else
    packages="setuptools wheel"
    for package in $packages; do
        if ! pip3 show "$package" &>/dev/null; then
            echo -e "${GREEN}Installing $package...${NC}"
            pip3 install --user "$package" || exit 1
        fi
    done
fi

#
# Add python bin dir to PATH if needed
#
user_python_bin_dir=$(python3 -m site --user-base)/bin
if [[ ! "$PATH" =~ "$user_python_bin_dir" ]]; then
    export PATH=$user_python_bin_dir:$PATH
fi

#
# Install Spoolman
#

# Install dependencies
echo -e "${GREEN}Installing Spoolman backend and its dependencies...${NC}"
# Create venv if it doesn't exist
if [ ! -d ".venv" ]; then
    python3 -m venv .venv || exit 1
fi

# Activate venv
source .venv/bin/activate || exit 1

# Install dependencies using pip
pip3 install -r requirements.txt || exit 1

#
# Initialize the .env file if it doesn't exist
#
if [ ! -f ".env" ]; then
    echo -e "${ORANGE}.env file not found. Creating it...${NC}"
    cp .env.example .env
fi

#
# Add execute permissions of all files in scripts dir
#
echo -e "${GREEN}Adding execute permissions to all files in scripts dir...${NC}"
chmod +x scripts/*.sh

#
# Install systemd service
#
echo -e "${CYAN}Do you want to install Spoolman as a systemd service? This will automatically start Spoolman when your server starts. (y/n)${NC}"
read choice

if [ "$choice" == "y" ] || [ "$choice" == "Y" ]; then
    systemd_user_dir="$HOME/.config/systemd/user"
    service_name="Spoolman"

    # Check if user-level systemd service exists and remove it
    if [ -f "$systemd_user_dir/$service_name.service" ]; then
        echo -e "${ORANGE}User-level systemd service already installed. Removing the existing service.${NC}"
        systemctl --user stop Spoolman  # Stop the service if it's running
        systemctl --user disable Spoolman  # Disable the service
        rm "$systemd_user_dir/$service_name.service"  # Remove the user-level service unit file
        systemctl --user daemon-reload  # Reload the systemd user service manager
    fi

    # Get the parent directory of the installer script
    script_dir=$( cd -- "$( dirname -- "${BASH_SOURCE[0]}" )" &> /dev/null && pwd )
    spoolman_dir=$(dirname "$script_dir")

    # Verify that we found the right spoolman dir by checking for the existence of pyproject.toml
    if [ ! -f "$spoolman_dir/pyproject.toml" ]; then
        echo -e "${ORANGE}Could not automatically find the Spoolman directory. Please specify the path to the Spoolman directory (the directory containing pyproject.toml):${NC}"
        read spoolman_dir
        # Expand the path
        spoolman_dir=$(eval echo "$spoolman_dir")
        # Verify again
        if [ ! -f "$spoolman_dir/pyproject.toml" ]; then
            echo -e "${ORANGE}Could not find pyproject.toml in $spoolman_dir. Aborting installation.${NC}"
            exit 1
        fi
    fi

    # Define the systemd service unit file
    service_unit="[Unit]
Description=Spoolman

[Service]
Type=simple
ExecStart=bash $spoolman_dir/scripts/start.sh
WorkingDirectory=$spoolman_dir
User=$USER
Restart=always

[Install]
WantedBy=default.target
"

    # Create the systemd service unit file
    service_file="/etc/systemd/system/$service_name.service"
    echo "$service_unit" | sudo tee "$service_file" > /dev/null

    # Reload the systemd user service manager
    sudo systemctl daemon-reload

    # Enable and start the service
    sudo systemctl enable "$service_name"
    sudo systemctl start "$service_name"

    # Load .env file now
    set -o allexport
    source .env
    set +o allexport

    local_ip=$(hostname -I | awk '{print $1}')

    echo -e "${GREEN}Spoolman systemd service has been installed and Spoolman is now starting.${NC}"
    echo -e "${GREEN}Spoolman will soon be reachable at ${ORANGE}http://$local_ip:$SPOOLMAN_PORT${NC}"
    echo -e "${GREEN}Please note that the displayed IP address may be incorrect for your setup. If needed, replace it manually with the correct IP.${NC}"
    echo -e "${GREEN}You can start/restart/stop the service by running e.g. '${CYAN}sudo systemctl stop Spoolman${GREEN}'${NC}"
    echo -e "${GREEN}You can disable the service from starting automatically by running '${CYAN}sudo systemctl disable Spoolman${GREEN}'${NC}"
    echo -e "${GREEN}You can view the Spoolman logs by running '${CYAN}sudo journalctl -u Spoolman${GREEN}'${NC}"
else
    echo -e "${ORANGE}Skipping systemd service installation.${NC}"
    echo -e "${ORANGE}You can start Spoolman manually by running 'bash scripts/start.sh'${NC}"
fi

echo -e "${GREEN}Spoolman has been installed successfully!${NC}"
echo -e "${GREEN}If you want to connect to an external database, you can edit the .env file and restart the service.${NC}"