import os

from pyramid.response import Response
from pyramid.config import Configurator
from tracim_backend.exceptions import PageNotFound
from tracim_backend.views import BASE_API_V2
from tracim_backend.lib.utils.request import TracimRequest
from tracim_backend.views.controllers import Controller

INDEX_PAGE_NAME = 'index.html'


class FrontendController(Controller):

    def __init__(self, dist_folder_path: str):
        self.dist_folder_path = dist_folder_path

    def not_found_view(self, context, request: TracimRequest):

        if request.path.startswith(BASE_API_V2):
            raise PageNotFound('{} is not a valid path'.format(request.path)) from context
        return self.index(context, request)

    def index(self, context, request: TracimRequest):
        index_file_path = os.path.join(self.dist_folder_path, INDEX_PAGE_NAME)
        if not os.path.exists(index_file_path):
            raise FileNotFoundError()
        with open(index_file_path) as file:
            return Response(
                content_type='text/html',
                body=file.read()
            )

    def bind(self, configurator: Configurator) -> None:

        configurator.add_notfound_view(self.not_found_view)
        # index.html for /index.html and /
        configurator.add_route('root', '/', request_method='GET')
        configurator.add_view(self.index, route_name='root')
        configurator.add_route('index', INDEX_PAGE_NAME, request_method='GET')
        configurator.add_view(self.index, route_name='index')

        for dirname in os.listdir(self.dist_folder_path):
            configurator.add_static_view(
                name=dirname,
                path=os.path.join(self.dist_folder_path, dirname)
            )