if [[ "${BASH_VERSINFO[0]}" -lt "4" ]]; then
  echo "!! Your system Bash is out of date: $BASH_VERSION"
  echo "!! Please upgrade to Bash 4 or greater."
  exit 2
fi

readonly app_path="${APP_PATH:-/app}"
readonly env_path="${ENV_PATH:-/tmp/env}"
readonly build_path="${BUILD_PATH:-/tmp/build}"
readonly cache_path="${CACHE_PATH:-/tmp/cache}"
readonly import_path="${IMPORT_PATH:-/tmp/app}"
readonly buildpack_path="${BUILDPACK_PATH:-/tmp/buildpacks}"

declare unprivileged_user="$USER"
declare unprivileged_group="${USER/nobody/nogroup}"

export PS1='\[\033[01;34m\]\w\[\033[00m\] \[\033[01;32m\]$ \[\033[00m\]'

ensure-paths() {
  mkdir -p \
    "$app_path" \
    "$env_path" \
    "$build_path" \
    "$cache_path" \
    "$buildpack_path"
}

paths() {
  declare desc="Shows path settings"
  printf "%-32s # %s\n" \
    "APP_PATH=$app_path" "Application path during runtime" \
    "ENV_PATH=$env_path" "Path to files for defining base environment" \
    "BUILD_PATH=$build_path" "Working directory during builds" \
    "CACHE_PATH=$cache_path" "Buildpack cache location" \
    "IMPORT_PATH=$import_path" "Mounted path to copy to app path" \
    "BUILDPACK_PATH=$buildpack_path" "Path to installed buildpacks"
}

version() {
  declare desc="Show version and supported version info"
  echo "herokuish: ${HEROKUISH_VERSION:-dev}"
  echo "buildpacks:"
  asset-cat include/buildpacks.txt | sed -e 's/.*heroku\///' -e 's/.*dokku\///' | xargs printf "  %-26s %s\n"
}

title() {
  echo $'\e[1G----->' "$@"
}

indent() {
  while read -r line; do
    if [[ "$line" == --* ]] || [[ "$line" == ==* ]]; then
      # shellcheck disable=SC2086
      echo $'\e[1G'$line
    else
      echo $'\e[1G      ' "$line"
    fi
  done
}

unprivileged() {
  setuidgid "$unprivileged_user" "$@"
}

detect-unprivileged() {
  unprivileged_user="$(stat -c %U "$app_path")"
  unprivileged_group="${unprivileged_user/nobody/nogroup}"
}

randomize-unprivileged() {
  local userid="$((RANDOM + 1000))"
  local username="u${userid}"

  addgroup --quiet --gid "$userid" "$username"
  adduser \
    --shell /bin/bash \
    --disabled-password \
    --force-badname \
    --no-create-home \
    --uid "$userid" \
    --gid "$userid" \
    --gecos '' \
    --quiet \
    --home "$app_path" \
    "$username"

  unprivileged_user="$username"
  unprivileged_group="$username"
}

herokuish-test() {
  declare desc="Test running an app through Herokuish"
  declare path="${1:-/}" expected="$2"
  export PORT=5678
  echo "::: BUILDING APP :::"
  buildpack-build
  echo "::: STARTING WEB :::"
  procfile-start web &
  for retry in $(seq 1 30); do
    sleep 1
    if ! nc -z -w 5 localhost "$PORT"; then
      echo "::: RETRYING LISTENER ($retry) :::"
    else
      echo "::: FOUND LISTENER :::" && break
    fi
  done
  echo "::: CHECKING APP :::"
  local output
  output="$(curl --fail --retry 10 --retry-delay 2 -v -s "localhost:${PORT}${path}")"
  if [[ "$expected" ]]; then
    sleep 1
    echo "::: APP OUTPUT :::"
    echo -e "$output"
    if [[ "$output" != "$expected" ]]; then
      echo "::: TEST FAILED :::"
      echo "::: EXPECTED: $expected :::"
      exit 2
    fi
  fi
  echo "::: TEST FINISHED :::"
}

main() {
  set -eo pipefail
  [[ "$TRACE" ]] && set -x

  cmd-export paths
  cmd-export version
  cmd-export herokuish-test test

  cmd-export-ns buildpack "Use and install buildpacks"
  cmd-export buildpack-build
  cmd-export buildpack-install
  cmd-export buildpack-list
  cmd-export buildpack-test

  cmd-export-ns slug "Manage application slugs"
  cmd-export slug-import
  cmd-export slug-generate
  cmd-export slug-export

  cmd-export-ns procfile "Use Procfiles and run app commands"
  cmd-export procfile-start
  cmd-export procfile-exec
  cmd-export procfile-parse

  case "$SELF" in
    /start) procfile-start "$@" ;;
    /exec) procfile-exec "$@" ;;
    /build) buildpack-build ;;
    *) cmd-ns "" "$@" ;;
  esac
}
