#!/bin/sh

IS_ROOT=/tmp/is-root
DL_DIR=${IS_ROOT}/tmp/dl
LISTS_DIR_O=/tmp/opkg-lists
LISTS_DIR=${IS_ROOT}${LISTS_DIR_O}
OPKG_CONF_DIR=${IS_ROOT}/etc/opkg
FEEDS_SERVER=https://istore.linkease.com/repo
ARCH=`jsonfilter -i /etc/.app_store.id -e '$.arch'`

# for istore self upgrade
ISTORE_PKG=luci-app-store
ISTORE_INDEX=https://istore.linkease.com/repo/all/store/Packages.gz

action=${1}
shift

is_init() {
    mkdir -p ${DL_DIR} ${LISTS_DIR} ${IS_ROOT}/etc ${IS_ROOT}/var

    cat /etc/opkg.conf | grep -v lists_dir | grep -v check_signature > ${IS_ROOT}/etc/opkg.conf

    cp ${IS_ROOT}/etc/opkg.conf ${IS_ROOT}/etc/opkg_o.conf

    echo >> ${IS_ROOT}/etc/opkg.conf
    echo "lists_dir ext ${LISTS_DIR}" >> ${IS_ROOT}/etc/opkg.conf
    echo >> ${IS_ROOT}/etc/opkg_o.conf
    echo "lists_dir ext ${LISTS_DIR_O}" >> ${IS_ROOT}/etc/opkg_o.conf

    cp -au /etc/opkg ${IS_ROOT}/etc/
    [ -e ${IS_ROOT}/var/lock ] || ln -s /var/lock ${IS_ROOT}/var/lock
}

opkg_wrap() {
    OPKG_CONF_DIR=${OPKG_CONF_DIR} opkg -f ${IS_ROOT}/etc/opkg.conf "$@"
}

fcurl() {
    curl --fail --show-error "$@"
}

update() {
    if [ -z "${ARCH}" ]; then
        echo "Get architecture failed" >&2
        echo "/etc/.app_store.id:" >&2
        cat /etc/.app_store.id >&2
        return 1
    fi

    fcurl -o ${OPKG_CONF_DIR}/meta.conf "${FEEDS_SERVER}/all/meta.conf" && \
      fcurl -o ${OPKG_CONF_DIR}/all.conf "${FEEDS_SERVER}/all/isfeeds.conf" && \
      fcurl -o ${OPKG_CONF_DIR}/arch.conf "${FEEDS_SERVER}/${ARCH}/isfeeds.conf" || \
      return 1

    opkg -f ${IS_ROOT}/etc/opkg_o.conf --offline-root ${IS_ROOT} update

    return 0
}

update_if_outdate() {
    local idle_t=$((`date '+%s'` - `date -r ${IS_ROOT}/.last_force_ts '+%s' 2>/dev/null || echo '0'`))
    [ $idle_t -gt ${1:-120} ] || return 1
    update || return 1
    touch ${IS_ROOT}/.last_force_ts
    return 0
}

check_self_upgrade() {
    local newest=`curl --connect-timeout 2 --max-time 5 -s ${ISTORE_INDEX} | gunzip | grep -FA10 "Package: ${ISTORE_PKG}" | grep -Fm1 'Version: ' | sed 's/^Version: //'`
    local current=`grep -Fm1 'Version: ' /usr/lib/opkg/info/${ISTORE_PKG}.control | sed 's/^Version: //'`
    if [ "v$newest" = "v" -o "v$current" = "v" ]; then
        echo "Check version failed!" >&2
        exit 255
    fi
    if [ "$newest" != "$current" ]; then
        echo "$newest"
    fi
    return 0
}

do_self_upgrade() {
    check_mtime || return 1
    if opkg_wrap info ${ISTORE_PKG} | grep -qF not-installed ; then
        true
    else
        update_if_outdate || return 1
    fi
    opkg_wrap upgrade ${ISTORE_PKG}
}

check_mtime() {
    find ${OPKG_CONF_DIR}/arch.conf -mtime -1 2>/dev/null | grep -q .  || update
}

wrapped_in_update() {
    check_mtime || return 1
    opkg_wrap "$@" && return 0
    update_if_outdate || return 1
    opkg_wrap "$@"
}

new_upgrade() {
    check_mtime || return 1
    local metapkg=`echo "$@" | sed 's/ /\n/g' | grep -F app-meta-`
    if [ -z "$metapkg" ] || opkg_wrap info $metapkg | grep -qF not-installed ; then
        true
    else
        update_if_outdate
    fi
    wrapped_in_update upgrade "$@"
}

usage() {
    echo "usage: is-opkg sub-command [arguments...]"
    echo "where sub-command is one of:"
    echo "      update                  Update list of available packages"
    echo "      upgrade <pkgs>          Upgrade package(s)"
    echo "      install <pkgs>          Install package(s)"
    echo "      remove <pkgs|regexp>    Remove package(s)"
    echo "      info [pkg|regexp]       Display all info for <pkg>"
    echo "      list-upgradable         List installed and upgradable packages"
    echo "      check_self_upgrade      Check iStore upgrade"
    echo "      do_self_upgrade         Upgrade iStore"
}

is_init >/dev/null 2>&1

case $action in
    "update")
        update
    ;;
    "install")
        wrapped_in_update install "$@"
    ;;
    "upgrade")
        new_upgrade "$@"
    ;;
    "remove")
        opkg_wrap --autoremove --force-removal-of-dependent-packages remove "$@"
    ;;
    "info")
        opkg_wrap info "$@"
    ;;
    "list-upgradable")
        opkg_wrap list-upgradable
    ;;
    "check_self_upgrade")
        check_self_upgrade
    ;;
    "do_self_upgrade")
        do_self_upgrade
    ;;
    *)
        usage
    ;;
esac