from flask_restful import Resource, abort
from flask import g, render_template
from marshmallow import Schema, fields
from webargs.flaskparser import use_args
from flasgger import swag_from
from app.api.blueprint import api
import app.accounts.api as accounts
from app.accounts.tasks import send_email_task
from app.api.auth_protection import ProtectedResource
from app.api.permission_protection import (requires_permission,
                                           valid_permissions)
from app.api.schemas import BaseResourceSchema


class UserSchema(BaseResourceSchema):
    username = fields.Str(required=True)
    email = fields.Email(required=True)
    password = fields.Str(required=True, load_only=True)


class RoleUpdateSchema(Schema):
    role_id = fields.Integer(required=True, load_only=True, location='json')


def validate_role_permissions(permissions_list):
    return set(permissions_list).issubset(valid_permissions)


class RoleSchema(BaseResourceSchema):
    id = fields.Integer(required=True, location='json')
    display_name = fields.String(required=True, location='json')
    permissions = fields.List(fields.String, required=True,
                              location='json', many=True,
                              validate=validate_role_permissions)


class RoleCreationSchema(Schema):
    display_name = fields.String(required=True, location='json')
    permissions = fields.List(fields.String, required=True,
                              location='json', many=True)


class AccountResource(ProtectedResource):
    @swag_from('swagger/get_account_spec.yaml')
    def get(self, account_id):
        if g.current_account.id == account_id:
            return UserSchema().dump(g.current_account), 200
        abort(403, message='You can only get your own account', status='error')


class RoleResource(ProtectedResource):
    @swag_from('swagger/get_role_spec.yaml')
    def get(self, role_id):
        return RoleSchema().dump(
                accounts.get_role(role_id)), 200


class RolesResource(ProtectedResource):
    @requires_permission('CREATE_ROLE', 'Role creation')
    @use_args(RoleCreationSchema(), locations=('json',))
    @swag_from('swagger/create_role_spec.yaml')
    def post(self, args):
        success = accounts.create_role(args['display_name'],
                                       args['permissions'])
        if success:
            return '', 201

    @swag_from('swagger/get_roles_spec.yaml')
    def get(self):
        return RoleSchema().dump(accounts.get_all_roles(), many=True), 200


class AccountRoleResource(ProtectedResource):
    @use_args(RoleUpdateSchema(), locations=('json',))
    @swag_from('swagger/update_account_role_spec.yaml')
    def put(self, args, account_id):
        if g.current_account.id == account_id:
            abort(403, message='You may not change your own roles',
                  status='error')
        success = accounts.update_account_role(account_id, args['role_id'])
        if success:
            return '', 204


class AccountListResource(Resource):
    @use_args(UserSchema(), locations=('json',))
    @swag_from('swagger/create_account_spec.yaml')
    def post(self, args):
        try:
            emailtoken = accounts.create_account(
                    args['username'],
                    args['email'],
                    args['password'])
            confirm_url = api.url_for(
                    AccountEmailTokenResource,
                    token=emailtoken, _external=True)
            html = render_template(
                    'activate_mail.html',
                    confirm_url=confirm_url)
            send_email_task.delay(
                    args['email'],
                    'Please confirm your email',
                    html)
            return '', 201
        except ValueError:
            abort(422, message='Account already exists', status='error')


class AccountEmailTokenResource(Resource):
    def get(self, token):
        success = accounts.confirm_email_token(token)
        if success:
            return '{"status": "success", \
                     "message": "Successfully confirmed email"}', 200


class AccountEmailTokenResendResource(Resource):
    @use_args(UserSchema(), locations=('json',))
    def post(self, args):
        return '', 201