from datetime import date, datetime

import pytest
from freezegun import freeze_time

from app.billing.rest import update_free_sms_fragment_limit_data
from app.dao.annual_billing_dao import dao_get_free_sms_fragment_limit_for_year
from app.dao.date_util import get_current_calendar_year_start_year
from tests.app.db import (
    create_annual_billing,
    create_ft_billing,
    create_service,
    create_template,
)

APR_2016_MONTH_START = datetime(2016, 3, 31, 23, 00, 00)
APR_2016_MONTH_END = datetime(2016, 4, 30, 22, 59, 59, 99999)

IN_MAY_2016 = datetime(2016, 5, 10, 23, 00, 00)
IN_JUN_2016 = datetime(2016, 6, 3, 23, 00, 00)


def test_create_update_free_sms_fragment_limit_invalid_schema(admin_request, sample_service):
    json_response = admin_request.post(
        'billing.create_or_update_free_sms_fragment_limit',
        service_id=sample_service.id,
        _data={},
        _expected_status=400
    )

    assert 'errors' in json_response


def test_create_free_sms_fragment_limit_current_year_updates_future_years(admin_request, sample_service):
    current_year = get_current_calendar_year_start_year()
    future_billing = create_annual_billing(sample_service.id, 1, current_year + 1)

    admin_request.post(
        'billing.create_or_update_free_sms_fragment_limit',
        service_id=sample_service.id,
        _data={'free_sms_fragment_limit': 9999},
        _expected_status=201
    )

    current_billing = dao_get_free_sms_fragment_limit_for_year(sample_service.id, current_year)
    assert future_billing.free_sms_fragment_limit == 9999
    assert current_billing.financial_year_start == current_year
    assert current_billing.free_sms_fragment_limit == 9999


@pytest.mark.parametrize('update_existing', [True, False])
def test_create_or_update_free_sms_fragment_limit_past_year_doenst_update_other_years(
    admin_request,
    sample_service,
    update_existing
):
    current_year = get_current_calendar_year_start_year()
    create_annual_billing(sample_service.id, 1, current_year)
    if update_existing:
        create_annual_billing(sample_service.id, 1, current_year - 1)

    data = {'financial_year_start': current_year - 1, 'free_sms_fragment_limit': 9999}
    admin_request.post(
        'billing.create_or_update_free_sms_fragment_limit',
        service_id=sample_service.id,
        _data=data,
        _expected_status=201)

    assert dao_get_free_sms_fragment_limit_for_year(sample_service.id, current_year - 1).free_sms_fragment_limit == 9999
    assert dao_get_free_sms_fragment_limit_for_year(sample_service.id, current_year).free_sms_fragment_limit == 1


def test_create_free_sms_fragment_limit_updates_existing_year(admin_request, sample_service):
    current_year = get_current_calendar_year_start_year()
    annual_billing = create_annual_billing(sample_service.id, 1, current_year)

    admin_request.post(
        'billing.create_or_update_free_sms_fragment_limit',
        service_id=sample_service.id,
        _data={'financial_year_start': current_year, 'free_sms_fragment_limit': 2},
        _expected_status=201)

    assert annual_billing.free_sms_fragment_limit == 2


@freeze_time('2021-04-02 13:00')
def test_get_free_sms_fragment_limit(
    admin_request, sample_service
):
    create_annual_billing(service_id=sample_service.id, free_sms_fragment_limit=11000, financial_year_start=2021)

    json_response = admin_request.get(
        'billing.get_free_sms_fragment_limit',
        service_id=sample_service.id
    )

    assert json_response['financial_year_start'] == 2021
    assert json_response['free_sms_fragment_limit'] == 11000


@freeze_time('2021-04-02 13:00')
def test_get_free_sms_fragment_limit_current_year_creates_new_row_if_annual_billing_is_missing(
    admin_request, sample_service
):
    json_response = admin_request.get(
        'billing.get_free_sms_fragment_limit',
        service_id=sample_service.id
    )

    assert json_response['financial_year_start'] == 2021
    assert json_response['free_sms_fragment_limit'] == 150000  # based on other organisation type


def test_update_free_sms_fragment_limit_data(client, sample_service):
    current_year = get_current_calendar_year_start_year()
    create_annual_billing(sample_service.id, free_sms_fragment_limit=250000, financial_year_start=current_year - 1)

    update_free_sms_fragment_limit_data(sample_service.id, 9999, current_year)

    annual_billing = dao_get_free_sms_fragment_limit_for_year(sample_service.id, current_year)
    assert annual_billing.free_sms_fragment_limit == 9999


def test_get_yearly_usage_by_monthly_from_ft_billing(admin_request, notify_db_session):
    service = create_service()
    create_annual_billing(service_id=service.id, free_sms_fragment_limit=1, financial_year_start=2016)

    sms_template = create_template(service=service, template_type="sms")
    email_template = create_template(service=service, template_type="email")

    for dt in (date(2016, 1, 28), date(2016, 8, 10), date(2016, 12, 26)):
        create_ft_billing(local_date=dt, template=sms_template, rate=0.0162)
        create_ft_billing(local_date=dt, template=email_template, billable_unit=0, rate=0)

    json_response = admin_request.get(
        'billing.get_yearly_usage_by_monthly_from_ft_billing',
        service_id=service.id,
        year=2016
    )

    assert len(json_response) == 3  # 3 billed months for SMS

    email_rows = [row for row in json_response if row['notification_type'] == 'email']
    assert len(email_rows) == 0

    sms_row = next(x for x in json_response if x['notification_type'] == 'sms')

    assert sms_row["month"] == "January"
    assert sms_row["notification_type"] == "sms"
    assert sms_row["chargeable_units"] == 1
    assert sms_row["notifications_sent"] == 1
    assert sms_row["rate"] == 0.0162
    # free allowance is 1
    assert sms_row["cost"] == 0
    assert sms_row["free_allowance_used"] == 1
    assert sms_row["charged_units"] == 0


def test_get_yearly_billing_usage_summary_from_ft_billing_returns_400_if_missing_year(admin_request, sample_service):
    json_response = admin_request.get(
        'billing.get_yearly_billing_usage_summary_from_ft_billing',
        service_id=sample_service.id,
        _expected_status=400
    )
    assert json_response == {
        'message': 'No valid year provided', 'result': 'error'
    }


def test_get_yearly_billing_usage_summary_from_ft_billing_returns_empty_list_if_no_billing_data(
    admin_request, sample_service
):
    json_response = admin_request.get(
        'billing.get_yearly_billing_usage_summary_from_ft_billing',
        service_id=sample_service.id,
        year=2016
    )
    assert json_response == []


def test_get_yearly_billing_usage_summary_from_ft_billing(admin_request, notify_db_session):
    service = create_service()
    create_annual_billing(service_id=service.id, free_sms_fragment_limit=1, financial_year_start=2016)

    sms_template = create_template(service=service, template_type="sms")
    email_template = create_template(service=service, template_type="email")

    for dt in (date(2016, 1, 28), date(2016, 8, 10), date(2016, 12, 26)):
        create_ft_billing(local_date=dt, template=sms_template, rate=0.0162)
        create_ft_billing(local_date=dt, template=email_template, billable_unit=0, rate=0)

    json_response = admin_request.get(
        'billing.get_yearly_billing_usage_summary_from_ft_billing',
        service_id=service.id,
        year=2016
    )

    assert len(json_response) == 2

    assert json_response[0]['notification_type'] == 'email'
    assert json_response[0]['chargeable_units'] == 0
    assert json_response[0]['notifications_sent'] == 3
    assert json_response[0]['rate'] == 0
    assert json_response[0]['cost'] == 0
    assert json_response[0]['free_allowance_used'] == 0
    assert json_response[0]['charged_units'] == 0

    assert json_response[1]['notification_type'] == 'sms'
    assert json_response[1]['chargeable_units'] == 3
    assert json_response[1]['notifications_sent'] == 3
    assert json_response[1]['rate'] == 0.0162
    assert json_response[1]['cost'] == 0.0324
    assert json_response[1]['free_allowance_used'] == 1
    assert json_response[1]['charged_units'] == 2
