import os, glob, subprocess, configparser
import web, system
import codecs

def run_profile_hooks(profile, step, cwd=None, env=None):
  hooks_dir = get_hooks_dir()
  step_hooks = profile[step]["hooks"]
  if not step_hooks:
    return
  for hook_name in step_hooks.split(","):
    trimmed_hook_name = hook_name.strip(' \t\n\r')
    if not trimmed_hook_name:
      continue
    hook_path = os.path.join(hooks_dir, trimmed_hook_name)
    code = subprocess.call(hook_path, cwd=cwd, stdin=subprocess.PIPE, env=env)
    if code != 0:
      raise Exception("Hook '{:s}' exited with a non zero code ({:d}) !".format(trimmed_hook_name, code))

def get_hooks_dir():
  return os.path.realpath(os.path.dirname(os.path.abspath(__file__)) + "/../hooks")

def get_lib_dir():
  return os.path.realpath(os.path.dirname(os.path.abspath(__file__)) + "/../lib")

def load_profile(profile_name):
  profile_filename = profile_name+".conf"
  for profile_file in get_available_profiles():
    if profile_filename == os.path.basename(profile_file):
      config = configparser.ConfigParser()
      with codecs.open(profile_file, encoding = 'utf-8', mode = 'r') as handle:
        config.read_file(handle)
        return config
  return None

def get_profiles_dir():
  return os.path.realpath(os.path.dirname(os.path.abspath(__file__)) + "/../profiles")

def get_available_profiles():
    return glob.glob(get_profiles_dir() + '/*.conf')

def get_available_profile_names():
    profile_files = get_available_profiles()
    return [os.path.splitext(os.path.basename(f))[0] for f in profile_files]

def get_workspace_dir():
    """Return the absolute path to the tamarin workspace ($HOME/.tamarin)"""
    home = os.environ["HOME"]
    return os.path.join(os.sep, home, '.tamarin')

def get_workspace_subdir(subdir):
    """Return the absolute path to a subdirectory in tamarin workspace"""
    dir_path = os.path.join(os.sep, get_workspace_dir(), subdir)
    os.makedirs(dir_path, exist_ok=True)
    return dir_path

def get_acbuild_achive_dest_dir():
    """Return the first path matching the acbuild archive extraction destination in tamarin workspace"""
    workspace_tmp = get_workspace_subdir('tmp')
    return glob.glob(os.path.join(os.sep, workspace_tmp, 'acbuild-v*'))[0]

def get_rkt_achive_dest_dir():
    """Return the first path matching the rkt archive extraction destination in tamarin workspace"""
    workspace_tmp = get_workspace_subdir('tmp')
    return glob.glob(os.path.join(os.sep, workspace_tmp, 'rkt-v*'))[0]

def download_rkt():
    """Download a local copy of rkt in the tamarin workspace and return the absolute path to the archive"""
    url = "https://github.com/coreos/rkt/releases/download/v1.22.0/rkt-v1.22.0.tar.gz"
    file_path=os.path.join(os.sep, get_workspace_subdir('tmp'), "rkt.tar.gz")
    web.download_file(file_url=url, dest_path=file_path)
    return file_path

def download_acbuild():
    """Download a local copy of acbuild in the tamarin workspace and return the absolute path to the archive"""
    url = "https://github.com/containers/build/releases/download/v0.4.0/acbuild-v0.4.0.tar.gz"
    file_path=os.path.join(os.sep, get_workspace_subdir('tmp'), "acbuild.tar.gz")
    web.download_file(file_url=url, dest_path=file_path)
    return file_path

def run_acbuild(args, captureOutput=False):
    """Run acbuild with the specified args (use the local copy if acbuild is not found in the $PATH)"""
    acbuild_bin = system.which('acbuild', get_workspace_subdir('acbuild'))
    print(" ".join([acbuild_bin] + args))
    if captureOutput:
        return subprocess.check_output([acbuild_bin] + args, stdin=subprocess.PIPE)
    else:
        return subprocess.call([acbuild_bin] + args, stdin=subprocess.PIPE)