#!/bin/bash -e
set -e

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

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
lines 40
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 $priority
    done << EOF
softwaves 1280x720.svg 65
softwaves 1280x800.svg 65
softwaves 1920x1080.svg 65
softwaves 1920x1200.svg 65
softwaves 2560x1440.svg 65
softwaves 2560x1600.svg 65
lines 1280x1024.svg 60
lines 1600x1200.svg 60
lines 1920x1080.svg 60
lines 1920x1200.svg 60
lines 2560x1080.svg 60
EOF
    # Old alternatives for the background
    while read background priority; do
        update-alternatives --install \
            /usr/share/images/desktop-base/desktop-background \
            desktop-background \
            /usr/share/images/desktop-base/$background $priority
    done << EOF
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
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
    # 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 $priority
    done << EOF
softwaves 40
lines 30
EOF
    # Old alternatives
    while read desktopbackground priority; do
        update-alternatives --install \
            /usr/share/images/desktop-base/desktop-background.xml \
            desktop-background.xml \
            /usr/share/images/desktop-base/$desktopbackground $priority
    done << EOF
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
    # 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
softwaves 40
lines 30
EOF

    # Set up an alternative for the wallpaper for Plasma 5/KDE
    # Highest priority for active theme
    update-alternatives --install \
        /usr/share/wallpapers/DebianTheme \
        desktop-plasma5-wallpaper \
        /usr/share/desktop-base/active-theme/wallpaper 50
    # 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
softwaves 40
lines 30
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/login/background.svg 50 \
        --slave /usr/share/sddm/themes/debian-theme/sddm-preview.jpg \
        desktop-sddm-preview \
        /usr/share/desktop-base/active-theme/login/sddm-preview.jpg
    # Alternatives for theme packages
    while read theme background sddm_preview priority; do
        update-alternatives --install /usr/share/images/desktop-base/login-background.svg \
            desktop-login-background \
            /usr/share/desktop-base/$theme-theme/login/$background $priority \
            --slave /usr/share/sddm/themes/debian-theme/sddm-preview.jpg \
            desktop-sddm-preview \
            /usr/share/desktop-base/$theme-theme/login/$sddm_preview
    done << EOF
softwaves background.svg sddm-preview.jpg 40
lines background.svg sddm-preview.jpg 30
lines background-nologo.svg sddm-preview-nologo.jpg 30
EOF
    # Old alternatives
    ## 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

    # Set up an alternative for the GRUB background/colors config
    # Highest priority for active theme
    ## Favor widescreen / hi-res background for efi installations
    num_grub_efi_installed=$(dpkg-query --list "grub-efi*" 2> /dev/null | grep "^i" | wc -l)
    if [ $num_grub_efi_installed -gt 0 ] ; then
        grub_prio_4x3=45
        grub_prio_16x9=50
    else
        grub_prio_4x3=50
        grub_prio_16x9=45
    fi
    update-alternatives --install \
        /usr/share/images/desktop-base/desktop-grub.png \
        desktop-grub \
        /usr/share/desktop-base/active-theme/grub/grub-4x3.png $grub_prio_4x3 \
        --slave /usr/share/desktop-base/grub_background.sh \
        desktop-grub.sh \
        /usr/share/desktop-base/active-theme/grub/grub_background.sh
    update-alternatives --install \
        /usr/share/images/desktop-base/desktop-grub.png \
        desktop-grub \
        /usr/share/desktop-base/active-theme/grub/grub-16x9.png $grub_prio_16x9 \
        --slave /usr/share/desktop-base/grub_background.sh \
        desktop-grub.sh \
        /usr/share/desktop-base/active-theme/grub/grub_background.sh
    # Alternatives for theme packages
    while read theme ratio priority; do
        update-alternatives --install /usr/share/images/desktop-base/desktop-grub.png \
            desktop-grub \
            /usr/share/desktop-base/$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
softwaves 4x3 40
softwaves 16x9 40
lines 4x3 30
lines 16x9 30
joy 4x3 30
joy 16x9 30
spacefun 4x3 30
spacefun 16x9 30
EOF

    # Apply GRUB background update into /boot
    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

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

fi