#!/bin/bash -e
set -e

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
softwaves 50
EOF

    # Use active theme as highest priority for background
    update-alternatives --install \
        /usr/share/images/desktop-base/desktop-background \
        desktop-background \
        /usr/share/desktop-base/active-theme/wallpaper/contents/images/1920x1080.svg 70
    # 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 $priority
    done << EOF
softwaves 1280x720.svg 65
softwaves 1920x1080.svg 65
softwaves 2560x1440.svg 65
EOF
    # Old alternatives for the background
    while read background priority; do
        update-alternatives --install \
            /usr/share/images/desktop-base/desktop-background \
            desktop-background \
            /usr/share/images/desktop-base/$background $priority
    done << EOF
lines-wallpaper_1280x1024.svg 60
lines-wallpaper_1600x1200.svg 60
lines-wallpaper_1920x1080.svg 60
lines-wallpaper_1920x1200.svg 60
lines-wallpaper_2560x1080.svg 60
joy-wallpaper_1600x1200.svg 50
joy-wallpaper_1280x1024.svg 50
joy-wallpaper_1920x1080.svg 50
joy-wallpaper_1920x1200.svg 50
joy-inksplat-wallpaper_1920x1080.svg 50
spacefun-wallpaper.svg 50
spacefun-wallpaper-widescreen.svg  50
moreblue-orbit-wallpaper.svg 40
moreblue-orbit-wallpaper-widescreen.svg 40
EOF

    # Set up an alternative for the XML version of the background
    # (for GNOME)
    # Highest priority for active theme
    update-alternatives --install \
        /usr/share/images/desktop-base/desktop-background.xml \
        desktop-background.xml \
        /usr/share/desktop-base/active-theme/wallpaper/gnome-background.xml 50
    # Alternative 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 $priority
    done << EOF
softwaves 40
EOF
    # Old alternatives
    while read desktopbackground priority; do
        update-alternatives --install \
            /usr/share/images/desktop-base/desktop-background.xml \
            desktop-background.xml \
            /usr/share/images/desktop-base/$desktopbackground $priority
    done << EOF
lines.xml 20
joy.xml 20
EOF

    # Set up an alternative for the XML version of the lock screen
    # (for GNOME)
    # Highest priority for active theme
    update-alternatives --install \
        /usr/share/images/desktop-base/desktop-lockscreen.xml \
        desktop-lockscreen.xml \
        /usr/share/desktop-base/active-theme/lockscreen/gnome-background.xml 50
    # Alternative 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
softwaves 40
EOF

    # Login theme
    # Highest priority for active theme
    update-alternatives --install /usr/share/images/desktop-base/login-background.svg \
        desktop-login-background \
        /usr/share/desktop-base/active-theme/backgrounds/login.svg 50 \
        --slave /usr/share/sddm/themes/debian-theme/sddm-preview.jpg \
        desktop-sddm-preview \
        /usr/share/desktop-base/active-theme/sddm-preview.jpg
    # Alternative for theme packages
    while read theme priority; do
        update-alternatives --install /usr/share/images/desktop-base/login-background.svg \
            desktop-login-background \
            /usr/share/desktop-base/$theme-theme/backgrounds/login.svg $priority \
            --slave /usr/share/sddm/themes/debian-theme/sddm-preview.jpg \
            desktop-sddm-preview \
            /usr/share/desktop-base/$theme-theme/sddm-preview.jpg
    done << EOF
softwaves 40
EOF
    # Old alternatives
    ## Lines
    update-alternatives --install /usr/share/images/desktop-base/login-background.svg \
        desktop-login-background \
        /usr/share/desktop-base/lines-theme/login-background.svg 20 \
        --slave /usr/share/sddm/themes/debian-theme/sddm-preview.jpg \
        desktop-sddm-preview \
        /usr/share/desktop-base/lines-theme/sddm-preview.jpg
    update-alternatives --install /usr/share/images/desktop-base/login-background.svg \
        desktop-login-background \
        /usr/share/desktop-base/lines-theme/login-background-with-logo.svg 20 \
        --slave /usr/share/sddm/themes/debian-theme/sddm-preview.jpg \
        desktop-sddm-preview \
        /usr/share/desktop-base/lines-theme/sddm-preview.jpg
    ## Joy
    update-alternatives --install /usr/share/images/desktop-base/login-background.svg \
        desktop-login-background \
        /usr/share/desktop-base/joy-theme/login-background.svg 20 \
        --slave /usr/share/sddm/themes/debian-theme/sddm-preview.jpg \
        desktop-sddm-preview \
        /usr/share/desktop-base/joy-theme/sddm-preview.jpg

    # Alternatives for grub
    ## Favor widescreen / hi-res background for efi installations
    num_grub_efi_installed=$(dpkg-query --list "grub-efi*" | grep "^i" | wc -l)
    if [ $num_grub_efi_installed -gt 0 ] ; then
        lines_grub_prio=15
        lines_grub_1920_prio=20
    else
        lines_grub_prio=20
        lines_grub_1920_prio=15
    fi
    update-alternatives --install \
        /usr/share/images/desktop-base/desktop-grub.png \
        desktop-grub \
        /usr/share/images/desktop-base/lines-grub.png $lines_grub_prio
    update-alternatives --install \
        /usr/share/images/desktop-base/desktop-grub.png \
        desktop-grub \
        /usr/share/images/desktop-base/lines-grub-1920x1080.png $lines_grub_1920_prio

    while read background priority; do
        update-alternatives --install \
            /usr/share/images/desktop-base/desktop-grub.png \
            desktop-grub \
            /usr/share/images/desktop-base/$background $priority
    done << EOF
joy-grub.png 15
spacefun-grub.png 15
spacefun-grub-widescreen.png 14
EOF

    # GRUB background
    if which update-grub2 > /dev/null ; then
        # Ensure the background image file has actually been written to disc
        # before updating.
        sync
        update-grub2 || true
    fi

    which update-initramfs > /dev/null
    if [ $? -eq 0 ] ; then
        update-initramfs -u
    fi

fi