#!/usr/bin/env bash
# Print the CI build matrix (JSON) for the images affected by the paths on
# stdin (one per line). Any change to shared files or the build tooling
# rebuilds every image. Empty input (e.g. schedule/manual runs) rebuilds all.
set -euo pipefail

changed="$(cat || true)"

all=0
[[ -z "${changed}" ]] && all=1
grep -qE '^(build\.sh|release\.sh|prune-releases\.sh|prune-registry\.sh|ci-matrix\.sh|\.gitea/)' <<< "${changed}" && all=1
grep -qE '^images/shared/' <<< "${changed}" && all=1

cosmic=0
remote=0
if [[ "${all}" == 1 ]]; then
  cosmic=1
  remote=1
fi
grep -qE '^images/fedora-cosmic/' <<< "${changed}" && cosmic=1
grep -qE '^images/fedora-remote/' <<< "${changed}" && remote=1

entries=()
if [[ "${cosmic}" == 1 ]]; then
  entries+=('{"image":"fedora-cosmic","distro":"44","arch":"x86_64","runner":"job-v2"}')
  entries+=('{"image":"fedora-cosmic","distro":"rawhide","arch":"x86_64","runner":"job-v2"}')
fi
if [[ "${remote}" == 1 ]]; then
  entries+=('{"image":"fedora-remote","distro":"44","arch":"x86_64","runner":"job-v2"}')
fi

joined="$(IFS=,; printf '%s' "${entries[*]:-}")"
printf '{"include":[%s]}\n' "${joined}"