import uuid
import pkg_resources

from pyramid.response import Response, FileResponse
from pyramid.view import view_config
import transaction
from soter.models import DBSession
from soter.models.auth import Role, Permission
from soter.models.validation_exception import ValidationError, TryCatchFunction

@view_config(route_name='role_list', permission='Users')
@view_config(request_method='GET', route_name='role_id', permission='Users')
@view_config(request_method='GET', route_name='role', permission='Users')
def html(request):
    package, resource = 'brewman:static/base.html'.split(':', 1)
    file = pkg_resources.resource_filename(package, resource)
    return FileResponse(file, request=request)


@view_config(request_method='POST', route_name='api_role', renderer='json', permission='Users')
@TryCatchFunction
def save(request):
    role = Role(request.json_body['Name'])
    DBSession.add(role)
    add_permissions(role, request.json_body['Permissions'])
    transaction.commit()
    return role_info(role.id)


@view_config(request_method='POST', route_name='api_role_id', renderer='json', permission='Users')
@TryCatchFunction
def update(request):
    id = request.matchdict.get('id', None)
    role = Role.by_id(uuid.UUID(id))
    role.name = request.json_body['Name']
    add_permissions(role, request.json_body['Permissions'])
    transaction.commit()
    return role_info(role.id)


def add_permissions(role, permissions):
    for permission in permissions:
        id = uuid.UUID(permission['PermissionID'])
        gp = [p for p in role.permissions if p.id == id]
        gp = None if len(gp) == 0 else gp[0]
        if permission['Enabled'] and gp is None:
            role.permissions.append(Permission.by_id(id))
        elif not permission['Enabled'] and gp:
            role.permissions.remove(gp)


@view_config(request_method='DELETE', route_name='api_role_id', renderer='json', permission='Users')
def delete(request):
    id = request.matchdict.get('id', None)
    if id is None:
        response = Response("Role is Null")
        response.status_int = 500
        return response
    else:
        response = Response("Role deletion not implemented")
        response.status_int = 500
        return response


@view_config(request_method='GET', route_name='api_role_id', renderer='json', permission='Users')
def show_id(request):
    return role_info(uuid.UUID(request.matchdict.get('id', None)))


@view_config(request_method='GET', route_name='api_role', renderer='json', permission='Users')
def show_blank(request):
    return role_info(None)


@view_config(request_method='GET', route_name='api_role', renderer='json', request_param='list', permission='Users')
def show_list(request):
    list = Role.list()
    roles = []
    for item in list:
        role = {'Name': item.name, 'Permissions': [], 'Url': request.route_url('role_id', id=item.id)}
        for permission in item.permissions:
            role['Permissions'].append(permission.name)
        roles.append(role)
    return roles


def role_info(id):
    if id is None:
        role = {'Name': '', 'Permissions': []}
        for item in Permission.list():
            role['Permissions'].append({'PermissionID': item.id, 'Name': item.name, 'Enabled': False})
    else:
        role_object = Role.by_id(id)
        role = {'RoleID': role_object.id, 'Name': role_object.name, 'Permissions': []}
        for item in Permission.list():
            role['Permissions'].append(
                {'PermissionID': item.id, 'Name': item.name, 'Enabled': True if item in role_object.permissions else False})
    return role