import logging
import os
import re

from flask import make_response, render_template
from flask_restful import reqparse

from config import frontend_visible_config
from external_libraries import get_external_javascript, get_external_css

from config_app.c_app import app, IS_KUBERNETES
from config_app._init_config import ROOT_DIR
from config_app.config_util.k8sconfig import get_k8s_namespace


def truthy_bool(param):
  return param not in {False, 'false', 'False', '0', 'FALSE', '', 'null'}


DEFAULT_JS_BUNDLE_NAME = 'configapp'
PARAM_REGEX = re.compile(r'<([^:>]+:)*([\w]+)>')
logger = logging.getLogger(__name__)
TYPE_CONVERTER = {
  truthy_bool: 'boolean',
  str: 'string',
  basestring: 'string',
  reqparse.text_type: 'string',
  int: 'integer',
}


def _list_files(path, extension, contains=""):
  """ Returns a list of all the files with the given extension found under the given path. """

  def matches(f):
    return os.path.splitext(f)[1] == '.' + extension and contains in os.path.splitext(f)[0]

  def join_path(dp, f):
    # Remove the static/ prefix. It is added in the template.
    return os.path.join(dp, f)[len(ROOT_DIR) + 1 + len('config_app/static/'):]

  filepath = os.path.join(os.path.join(ROOT_DIR, 'config_app/static/'), path)
  return [join_path(dp, f) for dp, _, files in os.walk(filepath) for f in files if matches(f)]


FONT_AWESOME_4 = 'netdna.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.css'


def render_page_template(name, route_data=None, js_bundle_name=DEFAULT_JS_BUNDLE_NAME, **kwargs):
  """ Renders the page template with the given name as the response and returns its contents. """
  main_scripts = _list_files('build', 'js', js_bundle_name)

  use_cdn = os.getenv('TESTING') == 'true'

  external_styles = get_external_css(local=not use_cdn, exclude=FONT_AWESOME_4)
  external_scripts = get_external_javascript(local=not use_cdn)

  contents = render_template(name,
                             route_data=route_data,
                             main_scripts=main_scripts,
                             external_styles=external_styles,
                             external_scripts=external_scripts,
                             config_set=frontend_visible_config(app.config),
                             kubernetes_namespace=IS_KUBERNETES and get_k8s_namespace(),
                             **kwargs)

  resp = make_response(contents)
  resp.headers['X-FRAME-OPTIONS'] = 'DENY'
  return resp


def fully_qualified_name(method_view_class):
  return '%s.%s' % (method_view_class.__module__, method_view_class.__name__)