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

# ECC Codex Git Hook: pre-push
# Runs a lightweight verification flow before pushes.

if [[ "${ECC_SKIP_GIT_HOOKS:-0}" == "1" || "${ECC_SKIP_PREPUSH:-0}" == "1" ]]; then
  exit 0
fi

if [[ -f ".ecc-hooks-disable" || -f ".git/ecc-hooks-disable" ]]; then
  exit 0
fi

if ! git rev-parse --is-inside-work-tree >/dev/null 2>&1; then
  exit 0
fi

# Skip checks for branch deletion pushes (e.g., git push origin --delete <branch>).
# The pre-push hook receives lines on stdin: <local ref> <local sha> <remote ref> <remote sha>.
# For deletions, the local sha is the zero OID.
is_delete_only=true
while read -r _local_ref local_sha _remote_ref _remote_sha; do
  if [[ "$local_sha" != "0000000000000000000000000000000000000000" ]]; then
    is_delete_only=false
    break
  fi
done
if [[ "$is_delete_only" == "true" ]]; then
  exit 0
fi

ran_any_check=0

log() {
  printf '[ECC pre-push] %s\n' "$*"
}

fail() {
  printf '[ECC pre-push] FAILED: %s\n' "$*" >&2
  exit 1
}

detect_pm() {
  if [[ -f "pnpm-lock.yaml" ]]; then
    echo "pnpm"
  elif [[ -f "bun.lockb" ]]; then
    echo "bun"
  elif [[ -f "yarn.lock" ]]; then
    echo "yarn"
  elif [[ -f "package-lock.json" ]]; then
    echo "npm"
  else
    echo "npm"
  fi
}

has_node_script() {
  local script_name="$1"
  node -e 'const fs=require("fs"); const p=JSON.parse(fs.readFileSync("package.json","utf8")); process.exit(p.scripts && p.scripts[process.argv[1]] ? 0 : 1)' "$script_name" >/dev/null 2>&1
}

run_pnpm() {
  if command -v corepack >/dev/null 2>&1; then
    # Corepack may download the pinned pnpm version on a cache miss. Set
    # COREPACK_ENABLE_NETWORK=0 to make an offline cache miss fail immediately.
    corepack pnpm "$@"
  elif command -v pnpm >/dev/null 2>&1; then
    pnpm "$@"
  else
    fail "pnpm could not be resolved from PATH or Corepack"
  fi
}

run_node_script() {
  local pm="$1"
  local script_name="$2"
  case "$pm" in
    pnpm) run_pnpm run "$script_name" ;;
    bun) bun run "$script_name" ;;
    yarn) yarn "$script_name" ;;
    npm) npm run "$script_name" ;;
    *) npm run "$script_name" ;;
  esac
}

if [[ -f "package.json" ]]; then
  pm="$(detect_pm)"
  log "Node project detected (package manager: $pm)"

  for script_name in lint typecheck test build; do
    if has_node_script "$script_name"; then
      ran_any_check=1
      log "Running: $script_name"
      run_node_script "$pm" "$script_name" || fail "$script_name failed"
    else
      log "Skipping missing script: $script_name"
    fi
  done

  if [[ "${ECC_PREPUSH_AUDIT:-0}" == "1" ]]; then
    ran_any_check=1
    log "Running dependency audit (ECC_PREPUSH_AUDIT=1)"
    case "$pm" in
      pnpm) run_pnpm audit --prod || fail "pnpm audit failed" ;;
      bun) bun audit || fail "bun audit failed" ;;
      yarn) yarn npm audit --recursive || fail "yarn audit failed" ;;
      npm) npm audit --omit=dev || fail "npm audit failed" ;;
      *) npm audit --omit=dev || fail "npm audit failed" ;;
    esac
  fi
fi

if [[ -f "go.mod" ]] && command -v go >/dev/null 2>&1; then
  ran_any_check=1
  log "Go project detected. Running: go test ./..."
  go test ./... || fail "go test failed"
fi

# Resolve how this project runs pytest, into PYTEST_CMD as an argv array.
#
# Looking only for `pytest` on PATH meant the hook skipped every project that keeps
# its tools in a virtualenv -- which is most of them -- and reported "pytest is not
# installed" while sitting next to a .venv with pytest in it. A gate that silently
# declines to gate is worse than no gate, because the skip line reads like a pass.
#
# An array rather than one string, because a virtualenv path may contain spaces:
# a scalar command splits `/home/me/my env/bin/python` into two paths that do not
# exist, and the hook then rejects the push for a reason that has nothing to do
# with the code being pushed.
#
# Echoes the command it will run, so the reason for a skip is always visible.
PYTEST_CMD=()

# Does this command actually run pytest? Accepting `--version` is not evidence --
# plenty of programs take it and exit 0 -- so the output has to name pytest. The
# version is captured rather than piped: under `set -o pipefail` a `| grep -q` can
# report the SIGPIPE of the program it just matched.
#
# Only ever called on a command this script composed itself. Probing an arbitrary
# operator-supplied command is not safe: a wrapper that ignores `--version` and
# execs pytest runs the entire suite during the probe, and is then rejected for
# not having printed a version.
is_pytest() {
  local version
  version="$("$@" --version 2>&1)" || return 1
  grep -qiE 'pytest[[:space:]]+(version[[:space:]]+)?[0-9]' <<<"$version"
}

resolve_pytest() {
  if [[ -n "${ECC_PYTEST_CMD:-}" ]]; then
    # Taken as given. This is a deliberate override, and the hook cannot inspect it
    # without running it -- a wrapper script may ignore `--version` and run the
    # suite, so probing costs a duplicate test run and then blocks the push anyway.
    # Pointing this at something that is not pytest turns the gate off, and that is
    # the operator's call to make, not a misconfiguration for the hook to second
    # guess. Word-split, so the command names something on PATH or an interpreter
    # whose path has no spaces; a venv with spaces is found by the loop below.
    read -r -a PYTEST_CMD <<<"$ECC_PYTEST_CMD" || true
    [[ ${#PYTEST_CMD[@]} -gt 0 ]] || fail "ECC_PYTEST_CMD is set but empty"
    return 0
  fi
  local venv
  for venv in "${VIRTUAL_ENV:-}" .venv venv env; do
    if [[ -n "$venv" && -x "$venv/bin/python" ]]; then
      if "$venv/bin/python" -c "import pytest" >/dev/null 2>&1; then
        PYTEST_CMD=("$venv/bin/python" -m pytest)
        return 0
      fi
    fi
  done
  if [[ -f "uv.lock" ]] && command -v uv >/dev/null 2>&1; then
    if uv run --no-sync python -c "import pytest" >/dev/null 2>&1; then
      PYTEST_CMD=(uv run --no-sync pytest)
      return 0
    fi
  fi
  if [[ -f "poetry.lock" ]] && command -v poetry >/dev/null 2>&1; then
    if poetry run python -c "import pytest" >/dev/null 2>&1; then
      PYTEST_CMD=(poetry run pytest)
      return 0
    fi
  fi
  # `command -v` proves only that a file of that name exists on PATH. This one the
  # script composed itself, so confirming it costs a harmless `pytest --version`.
  if command -v pytest >/dev/null 2>&1 && is_pytest pytest; then
    PYTEST_CMD=(pytest)
    return 0
  fi
  PYTEST_CMD=()
  return 1
}

if [[ -f "pyproject.toml" || -f "requirements.txt" ]]; then
  if resolve_pytest; then
    ran_any_check=1
    log "Python project detected. Running: ${PYTEST_CMD[*]} -q"
    pytest_status=0
    "${PYTEST_CMD[@]}" -q || pytest_status=$?
    case "$pytest_status" in
      0) ;;
      # pytest reserves 5 for NO_TESTS_COLLECTED, which is not a red suite. A
      # pyproject.toml that only configures ruff or black is still a Python project
      # by this hook's test, and blocking those pushes would make the gate something
      # people switch off. Never silent, though: a bad rootdir, testpaths or a
      # conftest that fails to import also collects nothing, and swallowing that is
      # the same skip-reads-like-a-pass hole this resolver exists to close.
      5)
        log "pytest collected no tests (exit 5). Not gating this push."
        log "  If this repository is supposed to have tests, that is the bug:"
        log "  check rootdir, testpaths, and conftest.py import errors."
        ;;
      # The code is in the message because 1 (tests failed) and 4 (usage error)
      # need different responses, and "pytest failed" alone cannot tell them apart.
      *) fail "pytest failed (exit $pytest_status)" ;;
    esac
  else
    log "Python project detected but no pytest found (checked \$VIRTUAL_ENV, .venv,"
    log "  venv, env, uv, poetry, PATH). Set ECC_PYTEST_CMD to point at it."
  fi
fi


if [[ "$ran_any_check" -eq 0 ]]; then
  log "No supported checks found in this repository. Skipping."
else
  log "Verification checks passed."
fi

exit 0