# Check either a package is installed or not
#
# example: ynh_package_is_installed 'yunohost' && echo "ok"
#
# usage: ynh_package_is_installed name
# | arg: name - the package name to check
ynh_package_is_installed() {
    dpkg-query -W -f '${Status}' "$1" 2>/dev/null \
        | grep -c "ok installed" &>/dev/null
}

# Get the version of an installed package
#
# example: version=$(ynh_package_version 'yunohost')
#
# usage: ynh_package_version name
# | arg: name - the package name to get version
# | ret: the version or an empty string
ynh_package_version() {
    if ynh_package_is_installed "$1"; then
        dpkg-query -W -f '${Version}' "$1" 2>/dev/null
    else
        echo ''
    fi
}

# Update package index files
#
# usage: ynh_package_update
ynh_package_update() {
    sudo apt-get -y -qq update
}

# Install package(s)
#
# usage: ynh_package_install name [name [...]]
# | arg: name - the package name to install
ynh_package_install() {
    sudo apt-get -y -qq install $@
}

# Build and install a package from an equivs control file
#
# example: generate an empty control file with `equivs-control`, adjust its
#          content and use helper to build and install the package:
#              ynh_package_install_from_equivs /path/to/controlfile
#
# usage: ynh_package_install_from_equivs controlfile
# | arg: controlfile - path of the equivs control file
ynh_package_install_from_equivs() {
    ynh_package_is_installed 'equivs' \
        || ynh_package_install equivs

    # retrieve package information
    pkgname=$(grep '^Package: ' $1 | cut -d' ' -f 2)
    pkgversion=$(grep '^Version: ' $1 | cut -d' ' -f 2)
    [[ -z "$pkgname" || -z "$pkgversion" ]] \
        && echo "Invalid control file" && exit 1
    controlfile=$(readlink -f "$1")

    # update packages cache
    ynh_package_update

    # build and install the package
    TMPDIR=$(ynh_mkdir_tmp)
    (cd $TMPDIR \
     && equivs-build "$controlfile" 1>/dev/null \
     && sudo dpkg --force-depends \
          -i "./${pkgname}_${pkgversion}_all.deb" 2>&1 \
     && sudo apt-get -f -y -qq install) \
        && ([[ -n "$TMPDIR" ]] && rm -rf $TMPDIR)
}

# Remove package(s)
#
# usage: ynh_package_remove name [name [...]]
# | arg: name - the package name to remove
ynh_package_remove() {
    sudo apt-get -y -qq remove $@
}

# Remove package(s) and their uneeded dependencies
#
# usage: ynh_package_autoremove name [name [...]]
# | arg: name - the package name to remove
ynh_package_autoremove() {
    sudo apt-get -y -qq autoremove $@
}