import datetime

import wtforms
from babel.dates import LOCALTZ
from canaille.app.forms import DateTimeUTCField
from flask import current_app
from werkzeug.datastructures import ImmutableMultiDict


def test_datetime_utc_field_no_timezone_is_local_timezone(testclient):
    del current_app.config["TIMEZONE"]

    offset = LOCALTZ.utcoffset(datetime.datetime.utcnow())

    class TestForm(wtforms.Form):
        dt = DateTimeUTCField()

    form = TestForm()
    form.validate()
    assert form.dt.data is None

    utc_date = datetime.datetime(2023, 6, 1, 12, tzinfo=datetime.timezone.utc)
    locale_date = datetime.datetime(2023, 6, 1, 12) + offset
    rendered_locale_date = locale_date.strftime("%Y-%m-%d %H:%M:%S")
    rendered_locale_date_form = locale_date.strftime("%Y-%m-%d %H:%M:%S")

    request_form = ImmutableMultiDict({"dt": rendered_locale_date_form})
    form = TestForm(request_form)
    assert form.validate()
    assert form.dt.data == utc_date
    assert (
        form.dt()
        == f'<input id="dt" name="dt" type="datetime-local" value="{rendered_locale_date_form}">'
    )

    form = TestForm(data={"dt": utc_date})
    assert form.validate()
    assert form.dt.data == utc_date
    assert (
        form.dt()
        == f'<input id="dt" name="dt" type="datetime-local" value="{rendered_locale_date}">'
    )

    class Foobar:
        dt = utc_date

    form = TestForm(obj=Foobar())
    assert form.validate()
    assert form.dt.data == utc_date
    assert (
        form.dt()
        == f'<input id="dt" name="dt" type="datetime-local" value="{rendered_locale_date}">'
    )


def test_datetime_utc_field_utc(testclient):
    current_app.config["TIMEZONE"] = "UTC"

    class TestForm(wtforms.Form):
        dt = DateTimeUTCField()

    form = TestForm()
    form.validate()
    assert form.dt.data is None

    date = datetime.datetime(2023, 6, 1, 12, tzinfo=datetime.timezone.utc)
    rendered_date = date.strftime("%Y-%m-%d %H:%M:%S")
    rendered_date_form = date.strftime("%Y-%m-%d %H:%M:%S")

    request_form = ImmutableMultiDict({"dt": rendered_date_form})
    form = TestForm(request_form)
    assert form.validate()
    assert form.dt.data == date
    assert (
        form.dt()
        == f'<input id="dt" name="dt" type="datetime-local" value="{rendered_date_form}">'
    )

    form = TestForm(data={"dt": date})
    assert form.validate()
    assert form.dt.data == date
    assert (
        form.dt()
        == f'<input id="dt" name="dt" type="datetime-local" value="{rendered_date}">'
    )

    class Foobar:
        dt = date

    form = TestForm(obj=Foobar())
    assert form.validate()
    assert form.dt.data == date
    assert (
        form.dt()
        == f'<input id="dt" name="dt" type="datetime-local" value="{rendered_date}">'
    )


def test_datetime_utc_field_japan_timezone(testclient):
    current_app.config["TIMEZONE"] = "Japan"

    class TestForm(wtforms.Form):
        dt = DateTimeUTCField()

    form = TestForm()
    form.validate()
    assert form.dt.data is None

    utc_date = datetime.datetime(2023, 6, 1, 12, tzinfo=datetime.timezone.utc)
    locale_date = datetime.datetime(2023, 6, 1, 21)
    rendered_locale_date = locale_date.strftime("%Y-%m-%d %H:%M:%S")
    rendered_locale_date_form = locale_date.strftime("%Y-%m-%d %H:%M:%S")

    request_form = ImmutableMultiDict({"dt": rendered_locale_date_form})
    form = TestForm(request_form)
    assert form.validate()
    assert form.dt.data == utc_date
    assert (
        form.dt()
        == f'<input id="dt" name="dt" type="datetime-local" value="{rendered_locale_date_form}">'
    )

    form = TestForm(data={"dt": utc_date})
    assert form.validate()
    assert form.dt.data == utc_date
    assert (
        form.dt()
        == f'<input id="dt" name="dt" type="datetime-local" value="{rendered_locale_date}">'
    )

    class Foobar:
        dt = utc_date

    form = TestForm(obj=Foobar())
    assert form.validate()
    assert form.dt.data == utc_date
    assert (
        form.dt()
        == f'<input id="dt" name="dt" type="datetime-local" value="{rendered_locale_date}">'
    )


def test_datetime_utc_field_invalid_timezone(testclient):
    current_app.config["TIMEZONE"] = "invalid"

    offset = LOCALTZ.utcoffset(datetime.datetime.utcnow())

    class TestForm(wtforms.Form):
        dt = DateTimeUTCField()

    form = TestForm()
    form.validate()
    assert form.dt.data is None

    utc_date = datetime.datetime(2023, 6, 1, 12, tzinfo=datetime.timezone.utc)
    locale_date = datetime.datetime(2023, 6, 1, 12) + offset
    rendered_locale_date = locale_date.strftime("%Y-%m-%d %H:%M:%S")
    rendered_locale_date_form = locale_date.strftime("%Y-%m-%d %H:%M:%S")

    request_form = ImmutableMultiDict({"dt": rendered_locale_date_form})
    form = TestForm(request_form)
    assert form.validate()
    assert form.dt.data == utc_date
    assert (
        form.dt()
        == f'<input id="dt" name="dt" type="datetime-local" value="{rendered_locale_date_form}">'
    )

    form = TestForm(data={"dt": utc_date})
    assert form.validate()
    assert form.dt.data == utc_date
    assert (
        form.dt()
        == f'<input id="dt" name="dt" type="datetime-local" value="{rendered_locale_date}">'
    )

    class Foobar:
        dt = utc_date

    form = TestForm(obj=Foobar())
    assert form.validate()
    assert form.dt.data == utc_date
    assert (
        form.dt()
        == f'<input id="dt" name="dt" type="datetime-local" value="{rendered_locale_date}">'
    )