===============
Mia! Accounting
===============


Description
===========

*Mia! Accounting* is an accounting module for Flask_ applications.
It implements `double-entry bookkeeping`_, and generates the following
accounting reports:

* Trial balance
* Income statement
* Balance sheet

In addition, *Mia! Accounting* tracks offsets for unpaid payables and
receivables.

You may try the `live demonstration`_.


Installation
============

Install *Mia! Accounting* with ``pip``:

::

    pip install mia-accounting

You may also download the from the `PyPI project page`_ or the
`release page`_ on the `Git repository`_.


Prerequisites
=============

You need a running Flask application with database user login.
The primary key of the user data model must be integer.

The following front-end JavaScript libraries must be loaded.  You may
download it locally or use CDN_.

* Bootstrap_ 5.2.3 or above
* FontAwesome_ 6.2.1 or above
* `Decimal.js`_ 6.4.3 or above
* `Tempus-Dominus`_ 6.4.3 or above


Configuration
=============

You need to pass the Flask *app* and an implementation of
``UserUtilityInterface`` to the ``init_app`` function.
``UserUtilityInterface`` contains everything *Mia! Accounting* needs.

The following is an example configuration for *Mia! Accounting*.

::

    from flask import Response, redirect
    from .auth import current_user()
    from .modules import User

    def create_app(test_config=None) -> Flask:
        app: Flask = Flask(__name__)

        ... (Configuration of SQLAlchemy, CSRF, Babel_JS, ... etc) ...

        import accounting

        class UserUtilities(accounting.UserUtilityInterface[User]):

            def can_view(self) -> bool:
                return True

            def can_edit(self) -> bool:
                return "editor" in current_user().roles

            def can_admin(self) -> bool:
                return current_user().is_admin

            def unauthorized(self) -> Response:
                return redirect("/login")

            @property
            def cls(self) -> t.Type[User]:
                return User

            @property
            def pk_column(self) -> Column:
                return User.id

            @property
            def current_user(self) -> User | None:
                return current_user()

            def get_by_username(self, username: str) -> User | None:
                return User.query.filter(User.username == username).first()

            def get_pk(self, user: User) -> int:
                return user.id

        accounting.init_app(app, UserUtils())

        ... (Any other configuration) ...

        return app


Database Initialization
=======================

After the configuration, you need to run
`flask_sqlalchemy.SQLAlchemy.create_all`_ to create the
database tables that *Mia! Accounting* uses.

*Mia! Accounting* adds three console commands:

* ``accounting-init-base``
* ``accounting-init-accounts``
* ``accounting-init-currencies``

You need to run ``accounting-init-base`` first, and then the other
two commands.

::

    % flask --app myapp accounting-init-base
    % flask --app myapp accounting-init-accounts
    % flask --app myapp accounting-init-currencies


Navigation Menu
===============

Include the navigation menu in the `Bootstrap navigation bar`_ in your
base template:

::

    <nav class="navbar navbar-expand-lg bg-body-tertiary bg-dark navbar-dark">
      <div class="container-fluid">
        ...
        <div id="collapsible-navbar" class="collapse navbar-collapse">
          <ul class="navbar-nav me-auto mb-2 mb-lg-0">
            ...
            {% include "accounting/include/nav.html" %}
            ...
          </ul>
          ...
        </div>
      </div>
    </nav>

Check your Flask application and see how it works.


Test Site and Live Demonstration
================================

You may find a working example in the `test site`_ in the
`source distribution`_.  It is the simplest website that works with
*Mia! Accounting*.  It is used in the automatic tests.  It is the same
code run for `live demonstration`_.

If you do not have a running Flask application, you may start with the
test site.


Documentation
=============

Refer to the `documentation on Read the Docs`_.


Copyright
=========

 Copyright (c) 2023 imacat.

 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at

     http://www.apache.org/licenses/LICENSE-2.0

 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.


Authors
=======

| imacat
| imacat@mail.imacat.idv.tw
| 2023/1/27


.. _Flask: https://flask.palletsprojects.com
.. _double-entry bookkeeping: https://en.wikipedia.org/wiki/Double-entry_bookkeeping
.. _live demonstration: https://accounting.imacat.idv.tw
.. _Bootstrap: https://getbootstrap.com
.. _FontAwesome: https://fontawesome.com
.. _Decimal.js: https://mikemcl.github.io/decimal.js
.. _Tempus-Dominus: https://getdatepicker.com
.. _CDN: https://en.wikipedia.org/wiki/Content_delivery_network
.. _PyPI project page: https://pypi.org/project/mia-accounting
.. _release page: https://github.com/imacat/mia-accounting/releases
.. _Git repository: https://github.com/imacat/mia-accounting
.. _flask_sqlalchemy.SQLAlchemy.create_all: https://flask-sqlalchemy.palletsprojects.com/en/3.0.x/api/#flask_sqlalchemy.SQLAlchemy.create_all
.. _Bootstrap navigation bar: https://getbootstrap.com/docs/5.3/components/navbar/
.. _test site: https://github.com/imacat/mia-accounting/tree/main/tests/test_site
.. _source distribution: https://pypi.org/project/mia-accounting/#files
.. _documentation on Read the Docs: https://mia-accounting.readthedocs.io