#!/usr/bin/env bash
# ci-cd.yml › detect — which checks does this pull request need?
# Compares the PR head's folder tree hashes with the target branch's. Tree hashes are content
# addressed, so this needs no merge-base and works on depth-1 clones.
# shellcheck source=common.sh
source "$(dirname "${BASH_SOURCE[0]}")/common.sh"

: "${BASE_REF:?BASE_REF (the PR target branch) is required}"
base="refs/remotes/origin/$BASE_REF"
git_remote fetch -q --depth 1 "$REPO_GIT_URL" "+refs/heads/$BASE_REF:$base"

# changed <path...> — succeeds if any path differs between the target branch and HEAD.
changed() {
  local p
  for p in "$@"; do
    if [[ "$(tree_hash "$p")" != "$(tree_hash "$p" "$base")" ]]; then return 0; fi
  done
  return 1
}
flag() { if changed "$@"; then echo true; else echo false; fi; }

set_output backend "$(flag "$BACKEND_PATH" "$BACKEND_TESTS_PATH" Backend/ERPCore.sln)"
set_output frontend "$(flag "$FRONTEND_PATH")"
set_output e2e "$(flag "$E2E_PATH")"
set_output scripts "$(flag deploy .gitea)"
set_output frontend_hash "$(tree_hash "$FRONTEND_PATH")"