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#!/bin/bash
#-------------------------------------------------------------------------------------------------------------
# Copyright (c) Microsoft Corporation. All rights reserved.
# Copyright (c) 2024 Antmicro <www.antmicro.com>
# Licensed under the MIT License. See https://go.microsoft.com/fwlink/?linkid=2090316 for license information.
#-------------------------------------------------------------------------------------------------------------
#
# Docs: https://github.com/microsoft/vscode-dev-containers/blob/main/script-library/docs/desktop-lite.md
# Maintainer: The VS Code and Codespaces Teams

. common.sh

NOVNC_VERSION="${NOVNCVERSION:-"1.2.0"}" # TODO: Add in a 'latest' auto-detect and swap name to 'version'
VNC_PASSWORD=${PASSWORD:-"vscode"}
NOVNC_PORT="${WEBPORT:-6080}"
VNC_PORT="${VNCPORT:-5901}"

INSTALL_NOVNC="${INSTALL_NOVNC:-"true"}"
USERNAME="${USERNAME:-"${_REMOTE_USER:-"automatic"}"}"

WEBSOCKETIFY_VERSION=0.10.0

if [ "$(id -u)" -ne 0 ]; then
    echo -e 'Script must be run as root. Use sudo, su, or add "USER root" to your Dockerfile before running this script.'
    exit 1
fi

# Determine the appropriate non-root user
if [ "${USERNAME}" = "auto" ] || [ "${USERNAME}" = "automatic" ]; then
    USERNAME=""
    POSSIBLE_USERS=("vscode" "node" "codespace" "$(awk -v val=1000 -F ":" '$3==val{print $1}' /etc/passwd)")
    for CURRENT_USER in "${POSSIBLE_USERS[@]}"; do
        if id -u ${CURRENT_USER} > /dev/null 2>&1; then
            USERNAME=${CURRENT_USER}
            break
        fi
    done
    if [ "${USERNAME}" = "" ]; then
        USERNAME=root
    fi
elif [ "${USERNAME}" = "none" ] || ! id -u ${USERNAME} > /dev/null 2>&1; then
    USERNAME=root
fi



##########################
#  Install starts here   #
##########################

# Ensure apt is in non-interactive to avoid prompts
export DEBIAN_FRONTEND=noninteractive

apt_get_update

# Check at least one locale exists
if ! grep -o -E '^\s*en_US.UTF-8\s+UTF-8' /etc/locale.gen > /dev/null; then
    echo "en_US.UTF-8 UTF-8" >> /etc/locale.gen
    locale-gen
fi

# Install the Cascadia Code fonts - https://github.com/microsoft/cascadia-code
if [ ! -d "/usr/share/fonts/truetype/cascadia" ]; then
    curl -sSL https://github.com/microsoft/cascadia-code/releases/download/v2008.25/CascadiaCode-2008.25.zip -o /tmp/cascadia-fonts.zip
    unzip /tmp/cascadia-fonts.zip -d /tmp/cascadia-fonts
    mkdir -p /usr/share/fonts/truetype/cascadia
    mv /tmp/cascadia-fonts/ttf/* /usr/share/fonts/truetype/cascadia/
    rm -rf /tmp/cascadia-fonts.zip /tmp/cascadia-fonts
fi

# Install noVNC
if [ "${INSTALL_NOVNC}" = "true" ] && [ ! -d "/usr/local/novnc" ]; then
    mkdir -p /usr/local/novnc
    curl -sSL https://github.com/novnc/noVNC/archive/v${NOVNC_VERSION}.zip -o /tmp/novnc-install.zip
    unzip /tmp/novnc-install.zip -d /usr/local/novnc
    cp /usr/local/novnc/noVNC-${NOVNC_VERSION}/vnc.html /usr/local/novnc/noVNC-${NOVNC_VERSION}/index.html
    curl -sSL https://github.com/novnc/websockify/archive/v${WEBSOCKETIFY_VERSION}.zip -o /tmp/websockify-install.zip
    unzip /tmp/websockify-install.zip -d /usr/local/novnc
    ln -s /usr/local/novnc/websockify-${WEBSOCKETIFY_VERSION} /usr/local/novnc/noVNC-${NOVNC_VERSION}/utils/websockify
    rm -f /tmp/websockify-install.zip /tmp/novnc-install.zip

    # Install noVNC dependencies and use them.
    check_packages python3-minimal python3-numpy
    sed -i -E 's/^python /python3 /' /usr/local/novnc/websockify-${WEBSOCKETIFY_VERSION}/run
fi

# Set up folders for scripts and init files
mkdir -p /var/run/dbus /usr/local/etc/vscode-dev-containers/

# Script to change resolution of desktop
cat << EOF > /usr/local/bin/set-resolution
#!/bin/bash
RESOLUTION=\${1:-\${VNC_RESOLUTION:-1920x1080}}
DPI=\${2:-\${VNC_DPI:-96}}
IGNORE_ERROR=\${3:-"false"}
if [ -z "\$1" ]; then
    echo -e "**Current Settings **\n"
    xrandr
    echo -n -e "\nEnter new resolution (WIDTHxHEIGHT, blank for \${RESOLUTION}, Ctrl+C to abort).\n> "
    read NEW_RES
    if [ "\${NEW_RES}" != "" ]; then
        RESOLUTION=\${NEW_RES}
    fi
    if ! echo "\${RESOLUTION}" | grep -E '[0-9]+x[0-9]+' > /dev/null; then
        echo -e "\nInvalid resolution format!\n"
        exit 1
    fi
    if [ -z "\$2" ]; then
        echo -n -e "\nEnter new DPI (blank for \${DPI}, Ctrl+C to abort).\n> "
        read NEW_DPI
        if [ "\${NEW_DPI}" != "" ]; then
            DPI=\${NEW_DPI}
        fi
    fi
fi

xrandr --fb \${RESOLUTION} --dpi \${DPI} > /dev/null 2>&1

if [ \$? -ne 0 ] && [ "\${IGNORE_ERROR}" != "true" ]; then
    echo -e "\nFAILED TO SET RESOLUTION!\n"
    exit 1
fi

echo -e "\nSuccess!\n"
EOF

# Container ENTRYPOINT script
cat << EOF > /usr/local/share/desktop-init.sh
#!/bin/bash

user_name="${USERNAME}"
group_name="$(id -gn ${USERNAME})"
LOG=/tmp/container-init.log

export DBUS_SESSION_BUS_ADDRESS="${DBUS_SESSION_BUS_ADDRESS:-"autolaunch:"}"
export DISPLAY="${DISPLAY:-:1}"
export VNC_RESOLUTION="${VNC_RESOLUTION:-1440x768x16}"
export LANG="${LANG:-"en_US.UTF-8"}"
export LANGUAGE="${LANGUAGE:-"en_US.UTF-8"}"

# Execute the command it not already running
startInBackgroundIfNotRunning()
{
    log "Starting \$1."
    echo -e "\n** \$(date) **" | sudoIf tee -a /tmp/\$1.log > /dev/null
    if ! pgrep -x \$1 > /dev/null; then
        keepRunningInBackground "\$@"
        while ! pgrep -x \$1 > /dev/null; do
            sleep 1
        done
        log "\$1 started."
    else
        echo "\$1 is already running." | sudoIf tee -a /tmp/\$1.log > /dev/null
        log "\$1 is already running."
    fi
}

# Keep command running in background
keepRunningInBackground()
{
    (\$2 bash -c "while :; do echo [\\\$(date)] Process started.; \$3; echo [\\\$(date)] Process exited!; sleep 5; done 2>&1" | sudoIf tee -a /tmp/\$1.log > /dev/null & echo "\$!" | sudoIf tee /tmp/\$1.pid > /dev/null)
}

# Use sudo to run as root when required
sudoIf()
{
    if [ "\$(id -u)" -ne 0 ]; then
        sudo "\$@"
    else
        "\$@"
    fi
}

# Use sudo to run as non-root user if not already running
sudoUserIf()
{
    if [ "\$(id -u)" -eq 0 ] && [ "\${user_name}" != "root" ]; then
        sudo -u \${user_name} "\$@"
    else
        "\$@"
    fi
}

# Log messages
log()
{
    echo -e "[\$(date)] \$@" | sudoIf tee -a \$LOG > /dev/null
}

log "** SCRIPT START **"

# Start dbus.
log 'Running "/etc/init.d/dbus start".'
if [ -f "/var/run/dbus/pid" ] && ! pgrep -x dbus-daemon  > /dev/null; then
    sudoIf rm -f /var/run/dbus/pid
fi
sudoIf /etc/init.d/dbus start 2>&1 | sudoIf tee -a /tmp/dbus-daemon-system.log > /dev/null
while ! pgrep -x dbus-daemon > /dev/null; do
    sleep 1
done

# Startup tigervnc server and fluxbox
sudoIf rm -rf /tmp/.X11-unix /tmp/.X*-lock
mkdir -p /tmp/.X11-unix
sudoIf chmod 1777 /tmp/.X11-unix
sudoIf chown root:\${group_name} /tmp/.X11-unix
if [ "\$(echo "\${VNC_RESOLUTION}" | tr -cd 'x' | wc -c)" = "1" ]; then VNC_RESOLUTION=\${VNC_RESOLUTION}x16; fi
screen_geometry="\${VNC_RESOLUTION%*x*}"
screen_depth="\${VNC_RESOLUTION##*x}"

# Change remote scaling
sed -i 's/UI.initSetting('\''resize'\''\, '\''off'\'')/UI.initSetting('\''resize'\''\, '\''remote'\'')/' /usr/local/novnc/noVNC*/app/ui.js

startInBackgroundIfNotRunning "Xtigervnc" sudoUserIf "tigervncserver \${DISPLAY} -geometry \${screen_geometry} -depth \${screen_depth} -rfbport ${VNC_PORT} -dpi \${VNC_DPI:-96} -localhost -desktop xfwm4 -fg -SecurityTypes None"

# Spin up noVNC if installed and not running.
if [ -d "/usr/local/novnc" ] && [ "\$(ps -ef | grep /usr/local/novnc/noVNC*/utils/launch.sh | grep -v grep)" = "" ]; then
    keepRunningInBackground "noVNC" sudoIf "/usr/local/novnc/noVNC*/utils/launch.sh --listen ${NOVNC_PORT} --vnc localhost:${VNC_PORT}"
    log "noVNC started."
else
    log "noVNC is already running or not installed."
fi

# Run whatever was passed in
log "Executing \"\$@\"."
exec "\$@"
log "** SCRIPT EXIT **"
EOF

echo "${VNC_PASSWORD}" | vncpasswd -f > /usr/local/etc/vscode-dev-containers/vnc-passwd
chmod +x /usr/local/share/desktop-init.sh /usr/local/bin/set-resolution

cat << EOF

You now have a working desktop! Connect to in one of the following ways:

- Forward port ${NOVNC_PORT} and use a web browser start the noVNC client (recommended)
- Forward port ${VNC_PORT} using VS Code client and connect using a VNC Viewer

In both cases, use the password "${VNC_PASSWORD}" when connecting

(*) Done!

EOF