from urllib.parse import urljoin

from flask import Flask
from mongoengine import Document

from restapi.views import ApiView
from restapi import Methods


class MongoApi:
    app: Flask = None

    def __init__(self, app: Flask):
        self.app = app

    def register_model(self, model: any, uri: str = None, name: str = None) -> None:
        if not getattr(model, '_meta').get('methods'):
            raise Exception("{} model methods not set".format(model.__name__))
        if not uri:
            uri = model.__name__.lower()
        if uri[:-1] != "/":
            uri = uri + "/"
        if uri[0] != "/":
            uri = "/" + uri
        if not name:
            name = model.__name__
        self.app.add_url_rule(
            uri,
            methods=(method.method for method in getattr(model, '_meta').get('methods') if
                     method not in (Methods.Get, Methods.Update)),
            view_func=ApiView.as_view(name, model=model))

        single = []
        if Methods.Update in getattr(model, '_meta').get('methods'):
            single.append('PUT')

        if Methods.Get in getattr(model, '_meta').get('methods'):
            single.append('GET')
        if single:
            self.app.add_url_rule(
                urljoin(uri, '<pk>/'),
                methods=single,
                view_func=ApiView.as_view("{}_GET_PUT".format(name), model=model))