#!/usr/bin/env bash

readonly VERSION=1.0.0
readonly ROOT=$(cd "$(dirname "$0")/.." && pwd)

# Space-separated check names; each has a check_<name> function.
CHECKS="repo_root_readable scripts_dir_present healthcheck_executable_bit
selftest_present test_healthcheck_present readme_present
no_crlf_line_endings no_tabs_in_scripts"

# name=ok / name=fail pairs, in run order.
RESULTS=
FAILED=0
TOTAL=0

# record <name> <status>: append one outcome to the results state.
record() {
  RESULTS="$RESULTS $1=$2"
  TOTAL=$((TOTAL + 1))
  [ "$2" = ok ] || FAILED=$((FAILED + 1))
}

check_repo_root_readable() { [ -d "$ROOT" ] && [ -r "$ROOT" ]; }
check_scripts_dir_present() { [ -d "$ROOT/scripts" ]; }
check_healthcheck_executable_bit() { [ -x "$ROOT/scripts/orchestra_e2e_healthcheck.sh" ]; }
check_selftest_present() { [ -f "$ROOT/scripts/orchestra_e2e_selftest.sh" ]; }
check_test_healthcheck_present() { [ -f "$ROOT/scripts/test_healthcheck.sh" ]; }
check_readme_present() { [ -f "$ROOT/README.md" ]; }

check_no_crlf_line_endings() {
  [ -d "$ROOT/scripts" ] || return 1
  ! grep -qU $'\r' "$ROOT"/scripts/*.sh "$ROOT/README.md" 2>/dev/null
}

check_no_tabs_in_scripts() {
  [ -d "$ROOT/scripts" ] || return 1
  ! grep -q "$(printf '\t')" "$ROOT"/scripts/*.sh 2>/dev/null
}

# emit <format> <template> [args...]: the single output path.
# format: text or json print; none suppresses (--quiet). Explicit argument,
# never read from an enclosing variable.
emit() {
  local format=$1
  shift
  [ "$format" = none ] || printf "$@"
}

main() {
  local quiet=
  local json=
  for arg in "$@"; do
    if [ "$arg" = --help ]; then
      emit text 'Usage: %s [--quiet]\n\n' "${0##*/}"
      emit text 'Healthcheck script for Orchestra E2E tests.\n'
      emit text 'Exits 0 with a success message if all checks pass.\n'
      emit text '  --quiet  Suppress the success message; still exits 0.\n'
      emit text 'Version: %s\n' "$VERSION"
      exit 0
    elif [ "$arg" = --quiet ]; then
      quiet=1
    elif [ "$arg" = --json ]; then
      json=1
    fi
  done

  local name
  for name in $CHECKS; do
    if "check_$name"; then
      record "$name" ok
    else
      record "$name" fail
    fi
  done

  local format=text
  [ -n "$quiet" ] && format=none
  [ -n "$json" ] && format=json

  if [ "$FAILED" -gt 0 ]; then
    local entry
    for entry in $RESULTS; do
      [ "${entry#*=}" = fail ] && emit "$format" 'FAIL - %s\n' "${entry%=*}"
    done
    exit 1
  fi

  if [ "$format" = json ]; then
    emit "$format" '{"status":"ok","checks":%d}\n' "$TOTAL"
    exit 0
  fi

  emit "$format" 'OK - all healthchecks passed\n'
  exit 0
}

main "$@"