import logging
from collections import defaultdict

from wtforms_sqlalchemy.orm import model_form

from ttfrog.db.manager import db


class BaseController:
    model = None

    def __init__(self, request):
        self.request = request
        self.record = None
        self.attrs = defaultdict(str)
        self.configure()
        if self.model:
            self.model_form = model_form(self.model, db_session=db.session)

        # load this from dotenv or something
        self.config = {
            'static_url': '/static',
            'project_name': 'TTFROG'
        }

    def configure(self):
        self.load_from_id()


    def load_from_id(self):
        if not self.request.POST['id']:
            return
        self.record = db.query(self.model).get(self.request.POST['id'])

    def form(self) -> str:
        # no model? no form.
        if not self.model:
            return ''

        # no user submission to process
        if self.request.method != 'POST':
            return self.model_form(obj=self.record)

        # process submission
        form = self.model_form(self.request.POST, obj=self.record)
        if self.model.validate(form):
            form.populate_obj(self.record)
            error = self.save_changes()
            if error:
                form.errors['process'] = error
        return form

    def save_changes(self):
        try:
            with db.transaction():
                for (key, val) in self.request.POST.items():
                    if hasattr(self.record, key):
                        setattr(self.record, key, val)
        except Exception as e:
            return e
        return None

    def output(self, **kwargs) -> dict:
        return dict(
            config=self.config,
            request=self.request,
            record=self.record,
            form=self.form(),
            **self.attrs,
            **kwargs,
        )

    def response(self):
        return self.output()