#!/bin/sh
temp_location="/tmp"
install_root="/tmp/alroot"
installed_pkg_database="${install_root}/var/aps/installed"
locpkg_database="${install_root}/var/aps/repos"
lock="${install_root}/var/aps/lock"
official="https://git.hippoz.xyz/alnux/repo"
[ ! -d "${installed_pkg_database}" ] && mkdir -p "${installed_pkg_database}"
die() {
    echo "${1}"
    rm "${lock}"
    exit 2
}
run_package_script() { # --- $2 is the package path, and $1 is the script to run
    {
        if [ -x "${2}/${1}" ]; then
            echo ":: Running ${1}"
            cd "${2}" || die "Could not enter package working directory. Exiting..."
            "${2}/${1}" "${2}/payload" "${2}"
        fi
    }
}
install_local_package() {
    [ ! -e "${1}" ] && die "[E] File ${1} does not exist. Exiting..."
    # Extract the package
    echo "[*] Copying package ${1} into temporary location ${temp_location}..."
    cp -prv "${1}" "${temp_location}"
    pkg_name="${1%/}"
    pkg_name="${pkg_name##*/}"
    pkg_name=$(echo "${pkg_name}" | cut -f 1 -d '.')
    pkg_path="${temp_location}/${pkg_name}"
    cd "${pkg_path}" || die "Could not enter package path."
    # Set default values for package
    pkg_config_deploy=true
    pkg_config_ver="0"
    pkg_config_makedepends=""
    pkg_config_depends=""
    # Install package
    . "${pkg_path}/package"
    run_package_script "build" "${pkg_path}"
    run_package_script "predeploy" "${pkg_path}"
    # Deploy package
    if [ "${pkg_config_deploy}" = true ]; then
        echo ":: Deploying target ${pkg_name}..."
        cp -rpv "${pkg_path}/payload"/* "${install_root}" > "${temp_location}/${pkg_name}-payloaddeploylog"
        sed 's/^.*-> //' "${temp_location}/${pkg_name}-payloaddeploylog" | tr -d \'\" > "${temp_location}/${pkg_name}-payloadfiles"
        rm "${temp_location}/${pkg_name}-payloaddeploylog"
    fi
    run_package_script "postdeploy" "${pkg_path}"
    echo "[*] Install complete for target ${pkg_name}"
    # Add package to database
    if [ -x "${pkg_path}/package" ]; then
        echo ":: Adding target ${pkg_name} to installed package database..."
        [ ! -d "${installed_pkg_database}/${pkg_name}" ] && mkdir "${installed_pkg_database}/${pkg_name}"
        cp -pv "${pkg_path}/package" "${installed_pkg_database}/${pkg_name}/package"
        [ -e "${temp_location}/${pkg_name}-payloadfiles" ] && cp -pv "${temp_location}/${pkg_name}-payloadfiles" "${installed_pkg_database}/${pkg_name}/payloadfiles"
    else
        die "[E] Target ${pkg_name} does not have a package script (it's an invalid package!). Exiting..."
    fi
    # Cleanup
    echo "[*] Cleaning up after target ${pkg_name}..."
    rm -r "${pkg_path}"
    rm "${temp_location}/${pkg_name}-payloadfiles"
    cd "${install_root}" || die "Could not return to main directory. Exiting..."
    unset pkg_path
    unset pkg_name
    unset pkg_config_deploy
    unset pkg_config_ver
    unset pkg_config_makedepends
    unset pkg_config_depends
}
remove_local_package() {
    pkg_path="${installed_pkg_database}/${1}"
    [ ! -d "${pkg_path}" ] && die "Package could not be found in local installed package database. Exiting..."
    payloadfiles_path="${pkg_path}/payloadfiles"
    [ ! -e "${payloadfiles_path}" ] && die "[E] Package ${1} does not have a payloadfiles file. Exiting..."
    echo ":: Removing target ${1}..."
    rm -rv "$(cat ${payloadfiles_path})"
    rm -rv "${pkg_path}"
    echo "[*] Removal complete for target ${pkg_name}"
}
sync_local_repo_database() {
    echo ":: Syncing local database for repo ${1}..."
    if [ ! -d "${locpkg_database}/${1}" ]; then
        echo ":: Local database for repo ${1} does not exist, cloning..."
        git clone "${2}" "${locpkg_database}/${1}"
    else
        echo ":: Local database for repo ${1} exists, updating..."
        cd "${locpkg_database}/${1}" || die "Could not enter local database. Exiting..."
        git pull
    fi
}
install_package_from_repo() { # NOTE(hippoz): This can get a tad confusing... ${1} is the repo and ${2} is the package
    echo ":: Installing package ${2} from ${1} repo"
    [ ! -d "${locpkg_database}/${1}/${2}" ] && die "[E] Target not found."
    install_local_package "${locpkg_database}/${1}/${2}"
}
upgrade() {
    echo ":: Upgrading installed packages..."
    unset_config_values
    cd "${installed_pkg_database}" || die "Could not enter installed package database. Exiting..."
    for pkg in */; do
        installed_pkg_path="${installed_pkg_database}/${pkg}"
        . "${installed_pkg_path}/package"
        pkg_name="${installed_pkg_path%/}"
        pkg_name="${pkg_name##*/}"
        already_installed_version=${pkg_config_ver}
        [ ! -d "${locpkg_database}/${1}/${pkg_name}" ] && die "[E] Package ${pkg_name} was not found in ${1}, exiting..."
        . "${locpkg_database}/${1}/${pkg_name}/package"
        if [ ! "${already_installed_version}" = "${pkg_config_ver}" ]; then
            echo ":: Package ${pkg_name} is out of date, updating..."
            install_package_from_repo "${1}" "${pkg_name}"
        fi
        unset pkg_config_deploy
        unset pkg_config_ver
        unset pkg_config_makedepends
        unset pkg_config_depends
    done
}
main() {
    if [ -f "${lock}" ]; then
        echo "[E] A lock file already exists. If you're sure no package manager is running, remove the file ${lock}."
        exit 1
    fi
    touch "${lock}"
    case ${1} in
        install) install_local_package "${2}" ;;
        remove) remove_local_package "${2}" ;;
        sync)
            sync_local_repo_database "official" ${official}
            [ -z "${2}" ] && die "[*] No targets specified."
            install_package_from_repo "official" "${2}" ;;
        upgrade) upgrade "official" ;;
        *) die "[E] Invalid option ${1}, exiting..." ;;
    esac
    rm "${lock}"
}
main "${1}" "${2}"