#!/usr/bin/env bash

# Change between dummy and fbdev driver for X session.

sudoFlags=()
if [[ -n "${SUDO_ASKPASS:-}" ]]; then
    sudoFlags=("-A")
fi

xorgConfDir="/etc/X11/xorg.conf.d"
xorgConfFile="${xorgConfDir}/10-screendriver.conf"

ensure_xorg_conf_dir() {
    if ! sudo "${sudoFlags[@]}" mkdir -p "${xorgConfDir}"; then
        msgbox "Failed to create ${xorgConfDir}."
        return 1
    fi
}

active_screen() {
    if ! ensure_xorg_conf_dir; then
        return 1
    fi
    if ! sudo "${sudoFlags[@]}" tee "${xorgConfFile}" > /dev/null << 'EOF'
Section "Device"
    Identifier  "FBdev"
    Driver      "fbdev"
EndSection
EOF
    then
        msgbox "Failed to write ${xorgConfFile}."
        return 1
    fi
}

headless() {
    if ! ensure_xorg_conf_dir; then
        return 1
    fi
    if ! sudo "${sudoFlags[@]}" tee "${xorgConfFile}" > /dev/null << 'EOF'
Section "Monitor"
    Identifier "dummy_monitor"
    HorizSync 28.0-80.0
    VertRefresh 48.0-75.0
    Modeline "1920x1080" 172.80 1920 2040 2248 2576 1080 1081 1084 1118
EndSection

Section "Device"
    Identifier "dummy_card"
    Driver "dummy"
    VideoRam 256000
    Option "UseFBDev" "false"
EndSection

Section "Screen"
    Identifier "dummy_screen"
    Device "dummy_card"
    Monitor "dummy_monitor"
    SubSection "Display"
        Depth 24
        Modes "1920x1080"
    EndSubSection
EndSection

Section "ServerLayout"
    Identifier "dummy_layout"
    Screen 0 "dummy_screen"
EndSection
EOF
    then
        msgbox "Failed to write ${xorgConfFile}."
        return 1
    fi
}


source ./.includes/functions.sh
source ./.includes/ui.sh
answer=$(yesno "Do you have a physical screen attached?")
if [[ "${answer}" == "Yes" ]]; then
    if active_screen; then
        msgbox "Settings for physical screen applied."
    else
        exit 1
    fi
else
    if headless; then
        msgbox "Settings for no screen applied."
    else
        exit 1
    fi
fi

if [[ "$1" != "-n" ]]; then
    restart
fi