#!/usr/bin/env bash
# Regression harness for Gitea PR metadata normalization and merge preflight.

set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
GIT_TOOLS_DIR="$(cd "$SCRIPT_DIR/.." && pwd)"
TEST_ROOT="${TEST_ROOT:-$(pwd)/.test-output/pr-gitea-wrapper-regression}"
FAKE_BIN="$TEST_ROOT/bin"
FAKE_REPO="$TEST_ROOT/repo"

rm -rf "$TEST_ROOT"
mkdir -p "$FAKE_BIN" "$FAKE_REPO" "$TEST_ROOT/state"

cat > "$FAKE_BIN/git" <<'SH'
#!/usr/bin/env bash
set -euo pipefail
if [[ "$*" == "remote get-url origin" ]]; then
  echo "https://git.uscllc.com/usc/uconnect.git"
  exit 0
fi
echo "unexpected git invocation: $*" >&2
exit 2
SH
chmod +x "$FAKE_BIN/git"

cat > "$FAKE_BIN/curl" <<'SH'
#!/usr/bin/env bash
set -euo pipefail
method="GET"
out_file=""
write_format=""
url=""
while [[ $# -gt 0 ]]; do
  case "$1" in
    -X)
      method="$2"; shift 2 ;;
    -o)
      out_file="$2"; shift 2 ;;
    -w)
      write_format="$2"; shift 2 ;;
    -H|-d)
      shift 2 ;;
    -s|-S|-f|-k|-sS|-fsS)
      shift ;;
    http*)
      url="$1"; shift ;;
    *)
      shift ;;
  esac
done

body='{}'
code="200"
if [[ "$method" == "GET" && "$url" == *"/api/v1/repos/usc/uconnect/pulls/1908" ]]; then
  body='{"number":1908,"title":"Test PR","body":"","state":"open","user":{"login":"edith"},"head":{"label":"fix/t_23fa9e1d-portal-health-backend","ref":"refs/pull/1908/head","sha":"abc123"},"base":{"label":"main","ref":"main","sha":"def456"},"labels":[],"assignees":[],"created_at":"2026-05-22T00:00:00Z","updated_at":"2026-05-22T00:00:00Z","html_url":"https://git.uscllc.com/usc/uconnect/pulls/1908","draft":false,"mergeable":true,"diff_url":"https://git.uscllc.com/usc/uconnect/pulls/1908.diff"}'
elif [[ "$method" == "POST" && "$url" == *"/api/v1/repos/usc/uconnect/pulls/1908/merge" ]]; then
  echo "$url" > "${TEST_ROOT:?}/state/merge-url"
  body='{"merged":true}'
else
  code="404"
  body='{"message":"not found"}'
fi

if [[ -n "$out_file" ]]; then
  printf '%s' "$body" > "$out_file"
else
  printf '%s' "$body"
fi
if [[ -n "$write_format" ]]; then
  printf '%s' "$code"
fi
SH
chmod +x "$FAKE_BIN/curl"

cat > "$FAKE_BIN/tea" <<'SH'
#!/usr/bin/env bash
echo "tea must not be invoked by Gitea merge preflight" >&2
exit 99
SH
chmod +x "$FAKE_BIN/tea"

cat > "$TEST_ROOT/credentials.json" <<'JSON'
{
  "gitea": {
    "usc": {"url": "https://git.uscllc.com", "token": "fake-token-usc"},
    "mosaicstack": {"url": "https://git.mosaicstack.dev", "token": "fake-token-mosaic"}
  }
}
JSON

export PATH="$FAKE_BIN:$PATH"
export TEST_ROOT
export MOSAIC_CREDENTIALS_FILE="$TEST_ROOT/credentials.json"
cd "$FAKE_REPO"

metadata="$("$GIT_TOOLS_DIR/pr-metadata.sh" -n 1908)"
python3 - "$metadata" <<'PY'
import json
import sys
metadata = json.loads(sys.argv[1])
assert metadata["baseRefName"] == "main", metadata
assert metadata["headRefName"] == "fix/t_23fa9e1d-portal-health-backend", metadata
PY

merge_output="$("$GIT_TOOLS_DIR/pr-merge.sh" -n 1908 -m squash --skip-queue-guard --dry-run 2>&1)"
if grep -q "mosaicstack\|Login name\|tea must not" <<<"$merge_output"; then
  echo "$merge_output" >&2
  exit 1
fi
if ! grep -q "Dry run: Gitea merge preflight OK" <<<"$merge_output"; then
  echo "$merge_output" >&2
  exit 1
fi

printf 'Gitea PR metadata and merge preflight regression passed\n'