#!/bin/sh
set -e

# Tag to allow some debhelper commands to inject relevant code
#DEBHELPER#

if [ "${1}" = "configure" ] && [ ! -z "${2}" ]; then
    if dpkg --compare-versions ${2} le "9.0.0~exp1"; then
        # Try remove folder if empty, left after 9.0.0~exp1 conf suppression
        # by debhelper conffile handling
        OLD_KDM_DIR=/etc/default/kdm.d
        if [ -d ${OLD_KDM_DIR} ] ; then
            echo "Removing old KDM configuration directory \"${OLD_KDM_DIR}\""
            rmdir ${OLD_KDM_DIR} || true
        fi
    fi
fi

if [ "$1" = "configure" ] || [ "$1" = "abort-upgrade" ] || [ "$1" = "abort-remove" ]; then
    # Theme package alternatives
    while read theme priority; do
        update-alternatives --install \
            /usr/share/desktop-base/active-theme \
            desktop-theme \
            /usr/share/desktop-base/$theme-theme $priority
    done << EOF
runner 50
EOF

    # Use active theme as highest priority for background
    active_background=/usr/share/desktop-base/active-theme/wallpaper/contents/images/1920x1080.svg
    if [ -e ${active_background} ]; then
        update-alternatives --install \
            /usr/share/images/desktop-base/desktop-background \
            desktop-background ${active_background} 70
    fi
    # Alternatives for the background in theme packages
    while read theme filename priority; do
        update-alternatives --install \
            /usr/share/images/desktop-base/desktop-background \
            desktop-background \
            /usr/share/desktop-base/$theme-theme/wallpaper/contents/images/$filename $priority
    done << EOF
runner 1024x768.svg 65
runner 1280x1024.svg 65
runner 1280x720.svg 65
runner 1280x800.svg 65
runner 1600x1200.svg 65
runner 1920x1080.svg 75
runner 1920x1200.svg 65
runner 2560x1440.svg 65
runner 2560x1600.svg 65
runner 3840x2160.svg 65
EOF

    # Set up an alternative for the XML version of the background
    # (for GNOME)
    # Highest priority for active theme
    active_background_xml=/usr/share/desktop-base/active-theme/wallpaper/gnome-background.xml
    if [ -e ${active_background_xml} ]; then
        update-alternatives --install \
            /usr/share/images/desktop-base/desktop-background.xml \
            desktop-background.xml ${active_background_xml} 50
    fi
    # Alternatives for theme packages
    while read theme priority; do
        update-alternatives --install \
            /usr/share/images/desktop-base/desktop-background.xml \
            desktop-background.xml \
            /usr/share/desktop-base/$theme-theme/wallpaper/gnome-background.xml $priority
    done << EOF
runner 40
EOF

    # Set up an alternative for the XML version of the lock screen
    # (for GNOME)
    # Highest priority for active theme
    active_lockscreen=/usr/share/desktop-base/active-theme/lockscreen/gnome-background.xml
    if [ -e ${active_lockscreen} ]; then
        update-alternatives --install \
            /usr/share/images/desktop-base/desktop-lockscreen.xml \
            desktop-lockscreen.xml ${active_lockscreen} 50
    fi
    # Alternatives for theme packages
    while read theme priority; do
        update-alternatives --install \
            /usr/share/images/desktop-base/desktop-lockscreen.xml \
            desktop-lockscreen.xml \
            /usr/share/desktop-base/$theme-theme/lockscreen/gnome-background.xml $priority
    done << EOF
runner 40
EOF

    # Set up an alternative for the wallpaper for Plasma 5/KDE
    # Highest priority for active theme
    active_plasma_wallpaper=/usr/share/desktop-base/active-theme/wallpaper
    if [ -e ${active_plasma_wallpaper} ]; then
        update-alternatives --install \
            /usr/share/wallpapers/DebianTheme \
            desktop-plasma5-wallpaper ${active_plasma_wallpaper} 50
    fi
    # Alternatives for theme packages
    while read theme priority; do
        update-alternatives --install \
            /usr/share/wallpapers/DebianTheme \
            desktop-plasma5-wallpaper \
            /usr/share/desktop-base/$theme-theme/wallpaper $priority
    done << EOF
runner 40
EOF

    # Login theme
    # Highest priority for active theme
    active_login_background=/usr/share/desktop-base/active-theme/login/background.svg
    if [ -e ${active_login_background} ]; then
        update-alternatives --install /usr/share/images/desktop-base/login-background.svg \
            desktop-login-background ${active_login_background} 50
    fi
    # Alternatives for theme packages
    while read theme background priority; do
        update-alternatives --install /usr/share/images/desktop-base/login-background.svg \
            desktop-login-background \
            /usr/share/desktop-base/$theme-theme/login/$background $priority
    done << EOF
runner background.svg 40
EOF

    # Set up an alternative for the GRUB background/colors config
    # Highest priority for active theme
    # Favor widescreen / hi-res background for efi installations detected
    # by the presence of grub-efi* packages (not the grub-efi*-bin which don’t
    # necessary account for grub being the active bootloader).
    if dpkg-query --list grub-efi* | grep -v "^... grub-efi[^[:space:]]*-bin" | grep -q "^[ih][HUFWti] " ; then
        echo "grub-efi* packages found, using 16/9 as default grub background ratio"
        grub_first_ratio="16x9"
        grub_second_ratio="4x3"
    else
        echo "No grub-efi* package found, using 4/3 as default grub background ratio"
        grub_first_ratio="4x3"
        grub_second_ratio="16x9"
    fi
    active_grub_background=/usr/share/desktop-base/active-theme/grub/grub_background.sh
    active_grub_first_ratio=/usr/share/desktop-base/active-theme/grub/grub-${grub_first_ratio}.png
    if [ -e ${active_grub_first_ratio} ] && [ -e ${active_grub_background} ]; then
        update-alternatives --install \
            /usr/share/images/desktop-base/desktop-grub.png \
            desktop-grub ${active_grub_first_ratio} 50 \
            --slave /usr/share/desktop-base/grub_background.sh \
            desktop-grub.sh ${active_grub_background}
    fi
    active_grub_second_ratio=/usr/share/desktop-base/active-theme/grub/grub-${grub_second_ratio}.png
    if [ -e ${active_grub_second_ratio} ] && [ -e ${active_grub_background} ]; then
        update-alternatives --install \
            /usr/share/images/desktop-base/desktop-grub.png \
            desktop-grub ${active_grub_second_ratio} 45 \
            --slave /usr/share/desktop-base/grub_background.sh \
            desktop-grub.sh ${active_grub_background}
    fi
    # Alternatives for theme packages
    while read theme ratio priority; do
        update-alternatives --install /usr/share/images/desktop-base/desktop-grub.png \
            desktop-grub \
            /usr/share/desktop-base/$theme-theme/grub/grub-$ratio.png $priority \
            --slave /usr/share/desktop-base/grub_background.sh \
            desktop-grub.sh \
            /usr/share/desktop-base/$theme-theme/grub/grub_background.sh
    done << EOF
runner 4x3 40
runner 16x9 40
EOF

    # Apply GRUB background update into /boot
    # Try detecting active grub packages (so not -doc, -common, -bin) as a hint
    # that GRUB is being used as bootloader before calling update-grub.
    # Some people use the *-bin packages without using GRUB as bootloader
    # (see #851893 for more context).
    if dpkg-query --list "grub-*" | grep -v "^... grub\(-common\|-emu\|[^[:space:]]*\(-bin\|-doc\)\)" | grep -q "^[ih][HUFWti] " \
            && which update-grub > /dev/null ; then
        # Ensure the background image file has actually been written to disc
        # before updating.
        sync
        # Report success whatever grub return status. This is needed at least
        # in live systems fon installation to succeed (see #850601).
        # Until we find a better solution like detecting we’re in a live image
        # and not calling update-grub at all.
        update-grub || echo "Updating grub failed, report success anyway!"
    fi

    if which update-initramfs > /dev/null; then
        update-initramfs -u
    fi

fi
