#!/usr/bin/env bash

readonly VERSION=1.0.0
readonly SUCCESS_MESSAGE='OK - all healthchecks passed'
readonly CHECKS=(script-runs)

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

  results+=("healthcheck ok")

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

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

  if [ -n "$summary" ]; then
    for r in "${results[@]}"; do
      emit "$format" '%s: %s\n' "${r%% *}" "${r#* }"
    done
  fi

  emit "$format" '%s\n' "$SUCCESS_MESSAGE"
  exit 0
}

main "$@"