#!/bin/bash
## compose: no-hooks


if [ -z "$SERVICE_DATASTORE" ]; then
    echo "This script is meant to be run through 'compose' to work properly." >&2
    exit 1
fi

version=0.1
usage="$exname [-h|--help] [--force|-f] [TARGET_VERSION]"
help="
USAGE:

$usage

DESCRIPTION:

Migrate the current nextcloud service to given target version. Don't
forget to change your =compose.yml= accordingly afterwards.

EXAMPLES:

  $exname 21.0.0

"

no_hint=
force=
target=
while [ "$1" ]; do
    case "$1" in
        "--help"|"-h")
            print_help >&2
            exit 0
            ;;
        "--force"|"-f")
            force=yes
            ;;
        "--no-hint")
            no_hint=yes
            ;;
        --*|-*)
            err "Unexpected optional argument '$1'"
            print_usage >&2
            exit 1
            ;;
        *)
            [ -z "$target" ] && { target=$1 ; shift ; continue ; }
            err "Unexpected positional argument '$1'"
            print_usage >&2
            exit 1
        ;;
    esac
    shift
done

. lib/common

nextcloud:code:version() {
    cat "$SERVICE_DATASTORE/var/www/html/version.php" |
        grep 'VersionString =' |
        cut -f 3 -d ' ' |
        cut -f 2 -d \'
}

current_image_version="${DOCKER_BASE_IMAGE#*:}"
current_image_version="${current_image_version%-myc}"


if ! [[ "$current_image_version" =~ ^[0-9]+.[0-9]+.[0-9]+$ ]]; then
    err "Current nextcloud version '$current_image_version' is unsupported yet."
    exit 1
fi


if ! [ -e "$SERVICE_DATASTORE/var/www/html/version.php" ]; then
    err "No code seem to have been deployed yet in datastore." \
        "This is not supported yet."
    exit 1
fi

current_code_version=$(nextcloud:code:version)

if [ "$current_code_version" != "$current_image_version" ]; then
    err "Current code version ${WHITE}$current_code_version${NORMAL}" \
        "mismatch with current image version" \
        "${WHITE}$current_image_version${NORMAL}"
    exit 1
fi

current_config_version=$(nextcloud:config:version)

info "Current config version: ${WHITE}$current_config_version${NORMAL}"
if [ "$current_config_version" != "$current_code_version" ]; then
    warn "Current config version ${WHITE}$current_config_version${NORMAL}" \
        "mismatch with current code version" \
        "${WHITE}$current_code_version${NORMAL}"
    echo "  Will use the config version as reference for upgrade." >&2
fi

last_available_versions=(
    $(DEBUG= docker:tags:fetch docker.0k.io/nextcloud 30 '[0-9]+\.[0-9+]\.[0-9]+-myc$' |
          sed -r 's/-myc$//g' |
          sort -rV)
)

## XXXvlab: put this in kal-shlib-common
version_gt() { test "$(printf '%s\n' "$@" | sort -V | head -n 1)" != "$1"; }

last_upgradable_versions=()
for v in "${last_available_versions[@]}"; do
    if version_gt "$v" "$current_config_version"; then
        last_upgradable_versions+=("$v")
    fi
done

docker_version=$(docker info --format '{{.ServerVersion}}')
last_compatible_versions=()
for v in "${last_upgradable_versions[@]}"; do
    if version_gt "$docker_version" 20.10.0; then
        last_compatible_versions+=("$v")
        continue
    fi
    if version_gt "26.99.99" "$v"; then
        last_compatible_versions+=("$v")
    fi
done


if [ "${#last_upgradable_versions[@]}" == 0 ]; then
    info "${DARKYELLOW}nextcloud${NORMAL} is already ${GREEN}up-to-date${NORMAL}."
    exit 0
fi

if [ -z "$target" ]; then
    info "Target latest version: ${WHITE}${last_available_versions[0]}${NORMAL}"
    target=${last_upgradable_versions[0]}
else
    if [[ " ${last_available_versions[*]} " != *" $target "* ]]; then
        err "Invalid version ${WHITE}$target${NORMAL} selected, please specify one of:"
        for v in "${last_upgradable_versions[@]}"; do
            echo " - $v"
        done >&2
        exit 1
    fi
    info "Target version ${WHITE}$target${NORMAL}"
fi

if [[ " ${last_compatible_versions[*]} " != *" $target "* ]]; then
    err "Sorry, ${DARKYELLOW}$SERVICE_NAME${NORMAL} ${WHITE}$target${NORMAL}" \
        "require docker version >= ${WHITE}20.10${NORMAL} (current: $docker_version)"
    echo "  Nextcloud versions <= ${WHITE}27${NORMAL} are still supported." >&2
    echo "  You can specify one of:" >&2
    for v in "${last_compatible_versions[@]}"; do
        echo "   - $v" >&2
    done
    exit 1
fi

upgrade_path=($(echo "${last_upgradable_versions[*]}" | tr ' ' '\n' | uniq -w 3 | sort -V))

containers="$(get_running_containers_for_service "$SERVICE_NAME")"

container_stopped=()
if [ -n "$containers" ]; then
    #err "Running container(s) for $DARKYELLOW$SERVICE_NAME$NORMAL are still running:"
    for container in $containers; do
        docker stop "$container" >/dev/null || {
            err "Failed to stop container '$container'."
            exit 1
        }
        docker rm "$container" > /dev/null || {
            err "Couldn't delete container '$container'."
        }
        container_stopped+=("$container")
    done
fi

## XXXvlab: taking first container is probably not a good idea
container="$(echo "$containers" | head -n 1)"

settmpdir MIGRATION_TMPDIR
set -o pipefail
for image_version in "${upgrade_path[@]}"; do

    while true; do
        patched=()

        current_code_version=$(nextcloud:code:version)
        current_config_version=$(nextcloud:config:version)
        if [ "$current_config_version" == "$image_version" ]; then
            err "Unexpected step where config version ${WHITE}$current_config_version${NORMAL} is same than image version"
            exit 1
        fi
        if ! version_gt "$image_version" "$current_config_version"; then
            err "Unexpected step where config version ${WHITE}$current_config_version${NORMAL} is greater than image version ${WHITE}$image_version${NORMAL}"
            exit 1
        fi
        if (( ${image_version%%.*} - ${current_config_version%%.*} > 1 )); then
            err "Unexpected step where config version ${WHITE}$current_config_version${NORMAL} is more than one major version less than image version ${WHITE}$image_version${NORMAL}"
            exit 1
        fi
        docker rmi "docker.0k.io/nextcloud:${current_config_version}-myc" >/dev/null 2>&1 || true
        if [ "$current_code_version" == "$image_version" ]; then
            ## Code already setup, we need to call ``occ upgrade`` by our selves
            info "Upgrading ${WHITE}$current_config_version${NORMAL} => ${WHITE}$image_version${NORMAL} (db)"
            compose --no-hooks \
                    --add-compose-content="$SERVICE_NAME:
  docker-compose:
    image: docker.0k.io/nextcloud:${image_version}-myc" \
                    run --rm \
                    -u www-data --entrypoint /var/www/html/occ "$SERVICE_NAME" \
                    upgrade 2>&1 |
                tee "$MIGRATION_TMPDIR/migration.log"
            errlvl="$?"
        else
            ## Code will be upgraded
            info "Upgrading ${WHITE}$current_config_version${NORMAL} => ${WHITE}$image_version${NORMAL} (code, db)"
            compose --no-hooks \
                    --add-compose-content="$SERVICE_NAME:
  docker-compose:
    image: docker.0k.io/nextcloud:${image_version}-myc" \
                    run --rm \
                    -v "$CHARM_PATH"/src/fake-apache:/usr/bin/apache \
                    --entrypoint /entrypoint.sh "$SERVICE_NAME" apache 2>&1 |
                tee "$MIGRATION_TMPDIR/migration.log"
            errlvl="$?"
        fi

        [ "$errlvl" == 0 ] && continue 2

        ##
        ## Damage control, there are some things we can solve
        ##
        if grep "^Update failed" "$MIGRATION_TMPDIR/migration.log" >/dev/null 2>&1; then

            ## XXXvlab: this comes from and should move to onlyoffice charm in
            ## some way.
            if grep "Update app onlyoffice" "$MIGRATION_TMPDIR/migration.log" >/dev/null 2>&1 && (
                    grep "SQLSTATE" "$MIGRATION_TMPDIR/migration.log" >/dev/null 2>&1 ||
                    grep "^Database error when running migration latest for app onlyoffice" "$MIGRATION_TMPDIR/migration.log" >/dev/null 2>&1 ); then

                if [ -e "$DATASTORE"/"$SERVICE_NAME/var/www/html/custom_apps/onlyoffice/lib/Migration/Version070400Date20220607111111.php" ]; then
                    patch="$CHARM_PATH/../onlyoffice/src/patch/00-onlyoffice-nextcloud.patch"
                    if ! [[ " ${patched[*]} " == *" $patch "* ]]; then
                        if (
                            cd "$DATASTORE"/"$SERVICE_NAME/var/www/html/custom_apps/onlyoffice/";
                            patch -Np1 --dry-run < "$patch" ); then
                            info "Found OnlyOffice issue, correcting it, and retrying."
                            (
                                cd "$DATASTORE"/"$SERVICE_NAME/var/www/html/custom_apps/onlyoffice/";
                                patch -Np1 < "$patch"
                            ) || exit 1
                            patched+=("$patch")
                            continue
                        fi
                    fi
                fi
            fi
        fi
        err "Upgrade to ${WHITE}$image_version${NORMAL} ${DARKRED}failed${NORMAL}. Aborting."
        exit 1

    done
done
if grep "^Nextcloud is in maintenance mode" "$MIGRATION_TMPDIR/migration.log" >/dev/null 2>&1; then
    info "Forcing maintenance mode off"
    compose --no-hooks \
            --add-compose-content="$SERVICE_NAME:
  docker-compose:
    image: docker.0k.io/nextcloud:${target}-myc" \
            run --rm \
            -u www-data --entrypoint /var/www/html/occ "$SERVICE_NAME" \
            maintenance:mode --off
fi
info "Successfully upgraded from ${WHITE}$current_config_version${NORMAL} to ${WHITE}$target${NORMAL}"

if [ -z "$no_hint" ]; then
    cat <<EOF >&2
Don't forget to force the version in your \`\`compose.yml\`\`. For instance:

  ${DARKYELLOW}$SERVICE_NAME${NORMAL}:

    ${DARKGRAY}# ...${NORMAL}

    ${WHITE}docker-compose${NORMAL}:
      ${WHITE}image${NORMAL}: docker.0k.io/nextcloud:${target}-myc

    ${DARKGRAY}# ...${NORMAL}

EOF
fi