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

SCRIPT_DIR="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")" >/dev/null 2>&1 && pwd)"
APP_SOURCE_DIR="${SCRIPT_DIR}/app"
APP_DIR="${APP_SOURCE_DIR}/dist"
PORT="8092"
URL="http://127.0.0.1:${PORT}/"
LOG_DIR="${HOME}/.cache/web-rtcp-5axis-sim"
LOG_FILE="${LOG_DIR}/local-server.log"
BUILD_LOG_FILE="${LOG_DIR}/local-build.log"

mkdir -p "$LOG_DIR"

if [[ ! -f "${APP_DIR}/index.html" ]]; then
  npm --prefix "$APP_SOURCE_DIR" run build >"$BUILD_LOG_FILE" 2>&1 || {
    echo "failed to build web app; see ${BUILD_LOG_FILE}" >&2
    exit 1
  }
fi

is_serving() {
  curl -fsS --max-time 1 "$URL" >/dev/null 2>&1
}

if ! is_serving; then
  nohup python3 -m http.server "$PORT" --bind 127.0.0.1 --directory "$APP_DIR" >"$LOG_FILE" 2>&1 &
  for _ in $(seq 1 40); do
    if is_serving; then
      break
    fi
    sleep 0.1
  done
fi

if ! is_serving; then
  echo "local web server failed to start at ${URL}; see ${LOG_FILE}" >&2
  exit 1
fi

if command -v google-chrome-stable >/dev/null 2>&1; then
  exec google-chrome-stable --new-window "$URL"
elif command -v google-chrome >/dev/null 2>&1; then
  exec google-chrome --new-window "$URL"
elif command -v chromium >/dev/null 2>&1; then
  exec chromium --new-window "$URL"
elif command -v chromium-browser >/dev/null 2>&1; then
  exec chromium-browser --new-window "$URL"
else
  exec xdg-open "$URL"
fi