#!/bin/bash

SCRIPTPATH="$( cd "$(dirname "$0")" >/dev/null 2>&1 ; pwd -P )"
KSPATH=$(sed 's/\/scripts//g' <<< $SCRIPTPATH)
KSENV="${KLIPPERSCREEN_VENV:-${HOME}/.KlipperScreen-env}"

XSERVER="xinit xinput x11-xserver-utils xserver-xorg-input-evdev xserver-xorg-input-libinput xserver-xorg-legacy xserver-xorg-video-fbdev"
PYTHON="python3-virtualenv virtualenv python3-distutils"
PYGOBJECT="libgirepository1.0-dev gcc libcairo2-dev pkg-config python3-dev gir1.2-gtk-3.0"
MISC="librsvg2-common libopenjp2-7 wireless-tools libdbus-glib-1-dev autoconf"
OPTIONAL="fonts-nanum fonts-ipafont libmpv-dev policykit-1 network-manager"

Red='\033[0;31m'
Green='\033[0;32m'
Cyan='\033[0;36m'
Normal='\033[0m'

echo_text ()
{
    printf "${Normal}$1${Cyan}\n"
}

echo_error ()
{
    printf "${Red}$1${Normal}\n"
}

echo_ok ()
{
    printf "${Green}$1${Normal}\n"
}

install_packages()
{
    echo_text "Update package data"
    sudo apt-get update

    echo_text "Checking for broken packages..."
    output=$(dpkg-query -W -f='${db:Status-Abbrev} ${binary:Package}\n' | grep -E ^.[^nci])
    if [ $? -eq 0 ]; then
        echo_text "Detected broken packages. Attempting to fix"
        sudo apt-get -f install
        output=$(dpkg-query -W -f='${db:Status-Abbrev} ${binary:Package}\n' | grep -E ^.[^nci])
        if [ $? -eq 0 ]; then
            echo_error "Unable to fix broken packages. These must be fixed before KlipperScreen can be installed"
            exit 1
        fi
    else
        echo_ok "No broken packages"
    fi

    echo_text "Installing KlipperScreen dependencies"
    sudo apt-get install -y $XSERVER
    if [ $? -eq 0 ]; then
        echo_ok "Installed X"
    else
        echo_error "Installation of X-server dependencies failed ($XSERVER)"
        exit 1
    fi
    sudo apt-get install -y $OPTIONAL
    echo $_
    sudo apt-get install -y $PYTHON
    if [ $? -eq 0 ]; then
        echo_ok "Installed Python dependencies"
    else
        echo_error "Installation of Python dependencies failed ($PYTHON)"
        exit 1
    fi
    sudo apt-get install -y $PYGOBJECT
    if [ $? -eq 0 ]; then
        echo_ok "Installed PyGobject dependencies"
    else
        echo_error "Installation of PyGobject dependencies failed ($PYGOBJECT)"
        exit 1
    fi
    sudo apt-get install -y $MISC
    if [ $? -eq 0 ]; then
        echo_ok "Installed Misc packages"
    else
        echo_error "Installation of Misc packages failed ($MISC)"
        exit 1
    fi
}

check_requirements()
{
    echo_text "Checking Python version"
    python3 --version
    if ! python3 -c 'import sys; exit(1) if sys.version_info <= (3,7) else exit(0)'; then
        echo_text 'Not supported'
        exit 1
    fi
}

create_virtualenv()
{
    echo_text "Creating virtual environment"
    if [ ! -d ${KSENV} ]; then
        virtualenv -p /usr/bin/python3 ${KSENV}
    fi

    source ${KSENV}/bin/activate
    if [[ "$(uname -m)" =~ armv[67]l ]]; then
        echo_text "Using armv[67]l! Adding piwheels.org as extra index..."
        pip --disable-pip-version-check install --extra-index-url https://www.piwheels.org/simple -r ${KSPATH}/scripts/KlipperScreen-requirements.txt
    else
        pip --disable-pip-version-check install -r ${KSPATH}/scripts/KlipperScreen-requirements.txt
    fi
    if [ $? -gt 0 ]; then
        echo_error "Error: pip install exited with status code $?"
        echo_text "Trying again with new tools..."
        sudo apt-get install -y build-essential cmake
        if [[ "$(uname -m)" =~ armv[67]l ]]; then
            echo_text "Adding piwheels.org as extra index..."
            pip install --extra-index-url https://www.piwheels.org/simple --upgrade pip setuptools
            pip install --extra-index-url https://www.piwheels.org/simple -r ${KSPATH}/scripts/KlipperScreen-requirements.txt
        else
            pip install --upgrade pip setuptools
            pip install -r ${KSPATH}/scripts/KlipperScreen-requirements.txt
        fi
        if [ $? -gt 0 ]; then
            echo_error "Unable to install dependencies, aborting install."
            deactivate
            exit 1
        fi
    fi
    deactivate
    echo_ok "Virtual enviroment created"
}

install_systemd_service()
{
    echo_text "Installing KlipperScreen unit file"

    SERVICE=$(<$SCRIPTPATH/KlipperScreen.service)
    KSPATH_ESC=$(sed "s/\//\\\\\//g" <<< $KSPATH)
    KSENV_ESC=$(sed "s/\//\\\\\//g" <<< $KSENV)

    SERVICE=$(sed "s/KS_USER/$USER/g" <<< $SERVICE)
    SERVICE=$(sed "s/KS_ENV/$KSENV_ESC/g" <<< $SERVICE)
    SERVICE=$(sed "s/KS_DIR/$KSPATH_ESC/g" <<< $SERVICE)

    echo "$SERVICE" | sudo tee /etc/systemd/system/KlipperScreen.service > /dev/null
    sudo systemctl unmask KlipperScreen.service
    sudo systemctl daemon-reload
    sudo systemctl enable KlipperScreen
    sudo systemctl set-default multi-user.target
    sudo adduser $USER tty
}

create_policy()
{
    POLKIT_DIR="/etc/polkit-1/rules.d"
    POLKIT_USR_DIR="/usr/share/polkit-1/rules.d"

    echo_text "Installing KlipperScreen PolicyKit Rules"
    sudo groupadd -f klipperscreen
    sudo adduser $USER netdev
    if [ ! -x "$(command -v pkaction)" ]; then
        echo "PolicyKit not installed"
        return
    fi

    POLKIT_VERSION="$( pkaction --version | grep -Po "(\d+\.?\d*)" )"
    echo_text "PolicyKit Version ${POLKIT_VERSION} Detected"
    if [ "$POLKIT_VERSION" = "0.105" ]; then
        # install legacy pkla
        create_policy_legacy
        return
    fi

    RULE_FILE=""
    if [ -d $POLKIT_USR_DIR ]; then
        RULE_FILE="${POLKIT_USR_DIR}/KlipperScreen.rules"
    elif [ -d $POLKIT_DIR ]; then
        RULE_FILE="${POLKIT_DIR}/KlipperScreen.rules"
    else
        echo "PolicyKit rules folder not detected"
        exit 1
    fi
    echo_text "Installing PolicyKit Rules to ${RULE_FILE}..."

    KS_GID=$( getent group klipperscreen | awk -F: '{printf "%d", $3}' )
    sudo /bin/sh -c "cat > ${RULE_FILE}" << EOF
// Allow KlipperScreen to reboot, shutdown, etc
polkit.addRule(function(action, subject) {
    if ((action.id == "org.freedesktop.login1.power-off" ||
         action.id == "org.freedesktop.login1.power-off-multiple-sessions" ||
         action.id == "org.freedesktop.login1.reboot" ||
         action.id == "org.freedesktop.login1.reboot-multiple-sessions" ||
         action.id == "org.freedesktop.login1.halt" ||
         action.id == "org.freedesktop.login1.halt-multiple-sessions" ||
         action.id.startsWith("org.freedesktop.NetworkManager.")) &&
        subject.user == "$USER") {
        // Only allow processes with the "klipperscreen" supplementary group
        // access
        var regex = "^Groups:.+?\\\s$KS_GID[\\\s\\\0]";
        var cmdpath = "/proc/" + subject.pid.toString() + "/status";
        try {
            polkit.spawn(["grep", "-Po", regex, cmdpath]);
            return polkit.Result.YES;
        } catch (error) {
            return polkit.Result.NOT_HANDLED;
        }
    }
});
EOF
}

create_policy_legacy()
{
    RULE_FILE="/etc/polkit-1/localauthority/50-local.d/20-klipperscreen.pkla"
    ACTIONS="org.freedesktop.login1.power-off"
    ACTIONS="${ACTIONS};org.freedesktop.login1.power-off-multiple-sessions"
    ACTIONS="${ACTIONS};org.freedesktop.login1.reboot"
    ACTIONS="${ACTIONS};org.freedesktop.login1.reboot-multiple-sessions"
    ACTIONS="${ACTIONS};org.freedesktop.login1.halt"
    ACTIONS="${ACTIONS};org.freedesktop.login1.halt-multiple-sessions"
    ACTIONS="${ACTIONS};org.freedesktop.NetworkManager.*"
    sudo /bin/sh -c "cat > ${RULE_FILE}" << EOF
[KlipperScreen]
Identity=unix-user:$USER
Action=$ACTIONS
ResultAny=yes
EOF
}

update_x11()
{
    echo_text "Adding X11 Xwrapper"
    sudo /bin/sh -c "cat >  /etc/X11/Xwrapper.config" << EOF
allowed_users=anybody
needs_root_rights=yes
EOF
}

fix_fbturbo()
{
    if [ $(dpkg-query -W -f='${Status}' xserver-xorg-video-fbturbo 2>/dev/null | grep -c "ok installed") -eq 0 ];
    then
        FBCONFIG="/usr/share/X11/xorg.conf.d/99-fbturbo.conf"
        if [ -e $FBCONFIG ]
        then
            echo_text "FBturbo not installed, but the configuration file exists"
            echo_text "This will fail if the config is not removed or the package installed"
            echo_text "moving the config to the home folder"
            sudo mv $FBCONFIG ~/99-fbturbo-backup.conf
        fi
    fi
}

add_desktop_file()
{
    DESKTOP=$(<$SCRIPTPATH/KlipperScreen.desktop)
    mkdir -p $HOME/.local/share/applications/
    echo "$DESKTOP" | tee $HOME/.local/share/applications/KlipperScreen.desktop > /dev/null
    sudo cp $SCRIPTPATH/../styles/icon.svg /usr/share/icons/hicolor/scalable/apps/KlipperScreen.svg
}

start_KlipperScreen()
{
    echo_text "Starting service..."
    sudo systemctl stop KlipperScreen
    sudo systemctl start KlipperScreen
}
if [ "$EUID" == 0 ]
    then echo_error "Please do not run this script as root"
    exit 1
fi
install_packages
check_requirements
create_virtualenv
create_policy
update_x11
fix_fbturbo
add_desktop_file
read -r -e -p "Install as a service? (This will enable boot to console) [Y/n]" choice
if [[ $choice =~ ^[nN]$ ]]; then
    echo_text "Not installing the service, KlipperScreen will need to be manually started"
    echo_ok "KlipperScreen was installed"
else
    install_systemd_service
    start_KlipperScreen
fi