#!/usr/bin/env bash
set -euo pipefail

# Build historical source, not today's implementation with a legacy DTO.
# Keep this commit pinned; a moved release tag must not silently change the gate.
case "${EVOBGP_LEGACY_VERSION:-2.56.2}" in
  2.56.2) legacy_ref=924f111e4871e1d6d47c9916d7da1b9051718f1c ;;
  1.0.0) legacy_ref=6ca34b900859665eede22044d734b698059bdf84 ;;
  *) echo 'Unsupported legacy test version' >&2; exit 2 ;;
esac
if ! git cat-file -e "$legacy_ref^{commit}" 2>/dev/null; then
  git fetch --no-tags --depth=1 origin "$legacy_ref"
fi
legacy_tmp="$(mktemp -d)"
trap 'rm -rf -- "$legacy_tmp"' EXIT
mkdir "$legacy_tmp/source"
archive_paths=(go.mod go.sum cmd/evobgp-node internal migrations)
if [ "${EVOBGP_LEGACY_VERSION:-2.56.2}" = 2.56.2 ]; then
  archive_paths+=(cmd/evobgp-agent)
fi
git archive "$legacy_ref" "${archive_paths[@]}" |
  tar -x -C "$legacy_tmp/source"
(
  cd "$legacy_tmp/source"
  go build -mod=readonly -o "$legacy_tmp/evobgp-node-legacy" ./cmd/evobgp-node
  if [ "${EVOBGP_LEGACY_VERSION:-2.56.2}" = 2.56.2 ]; then
    go build -mod=readonly -o "$legacy_tmp/evobgp-agent-legacy" ./cmd/evobgp-agent
  fi
)
export EVOBGP_TEST_LEGACY_NODE_BIN="$legacy_tmp/evobgp-node-legacy"
go test -race -count=1 -json -run '^TestLegacyNodeBinaryCurrentControlPlane$' ./internal/httpapi |
  tee "$legacy_tmp/result.jsonl"
assert_test() {
python3 - "$1" "$2" "$3" <<'PY'
import json
import sys

events = [json.loads(line) for line in open(sys.argv[1], encoding="utf-8")]
package, expected = sys.argv[2:4]
if any(e.get("Package") != package for e in events):
    raise SystemExit("unexpected legacy compatibility package")
if any(e.get("Action") in ("skip", "fail") for e in events):
    raise SystemExit("legacy compatibility test skipped or failed")
if not any(e.get("Test") == expected and e.get("Action") == "pass" for e in events):
    raise SystemExit("required legacy binary compatibility test did not execute")
if not any("Test" not in e and e.get("Action") == "pass" for e in events):
    raise SystemExit("legacy compatibility package did not pass")
print(f"Pinned legacy executable passed {expected}")
PY
}
assert_test "$legacy_tmp/result.jsonl" evobgp/internal/httpapi TestLegacyNodeBinaryCurrentControlPlane
if [ "${EVOBGP_LEGACY_VERSION:-2.56.2}" = 2.56.2 ]; then
  export EVOBGP_TEST_LEGACY_AGENT_BIN="$legacy_tmp/evobgp-agent-legacy"
  go test -race -count=1 -json -run '^TestLegacyAgentBinaryCurrentDispatch$' ./internal/nodedispatch |
    tee "$legacy_tmp/agent-result.jsonl"
  assert_test "$legacy_tmp/agent-result.jsonl" evobgp/internal/nodedispatch TestLegacyAgentBinaryCurrentDispatch
fi