#!/bin/bash

## List upstream available versions in reverse chronological order
##
## These versions information will be the input for the version information
## usually used by the build process.
## A external query of upstream sources will be done.
##

## This script is launched by ``charm upstream-versions`` and will receive these env variables
##
##
##  VERSION_LIMIT   ## limit number of version to read
##
##
## The script CWD will be the root of the charm directory
##

DOCKER_IMAGE_NAME=collabora/code

semver:normalize() {
    local upstream_version="$1"
    local version="${upstream_version/./}"
    read -r year_month major minor patch <<< ${version//./ }
    if ! [ "${#patch}" == 1 ]; then
        echo "Error: build number is not a single digit: '${patch}' (upstream: '${upstream_version}')" >&2
        return 1
    fi
    if [ "${#major}" -gt 2 ]; then
        echo "Error: major number is more than 2 digits: '${major}' (upstream: '${upstream_version}')" >&2 
        return 1
    fi
    major=$(printf "%02d" ${major})
    echo "${year_month}${major}.${minor}.${patch}"
}


upstream:list() {
    local limit=${1:-5}
    docker-tags-fetch "$DOCKER_IMAGE_NAME" -l "${limit}" -f "^[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+\.[0-9]+" |
        sort -rV |
        cut -f 1 -d "-"
}


while read -r "upstream_version"; do
    normalized_version=$(semver:normalize "${upstream_version}") || exit 1
    printf "%s %s\n" "$(semver:normalize "${upstream_version}")" "$upstream_version"
done < <(upstream:list "${VERSION_LIMIT}")