import os
import decimal
import pickle

import pytest

from datetime import date, timedelta, datetime, time
from django import forms
from django.db.models import signals
from django.core.files.uploadedfile import SimpleUploadedFile
from django.conf import settings

from dynamic_preferences.models import GlobalPreferenceModel
from dynamic_preferences.settings import preferences_settings
from dynamic_preferences.registries import global_preferences_registry
from dynamic_preferences import types

from .test_app.models import BlogEntry


@pytest.fixture
def no_validate_names(settings):
    settings.DYNAMIC_PREFERENCES = {"VALIDATE_NAMES": False}


@pytest.fixture
def blog_entry(db):
    return BlogEntry.objects.create(title="Hello", content="World")


def test_default_accepts_callable(no_validate_names):
    class P(types.IntPreference):
        def get_default(self):
            return 4

    assert P().get("default") == 4


def test_getter(no_validate_names):
    class PNoGetter(types.IntPreference):
        default = 1
        help_text = "Hello"

    class PGetter(types.IntPreference):
        def get_default(self):
            return 1

        def get_help_text(self):
            return "Hello"

    p_no_getter = PNoGetter()
    p_getter = PGetter()
    for attribute, expected in [("default", 1), ("help_text", "Hello")]:
        assert p_no_getter.get(attribute) == expected
        assert p_getter.get(attribute) == expected


def test_field(no_validate_names):
    class P(types.IntPreference):
        default = 1
        verbose_name = "P"

    p = P()

    assert p.field.initial == 1
    assert p.field.label == "P"
    assert p.field.__class__ == forms.IntegerField


def test_boolean_field_class_instantiation(no_validate_names):
    class P(types.BooleanPreference):
        default = False

    preference = P()
    assert preference.field.initial is False


def test_char_field_class_instantiation(no_validate_names):
    class P(types.StringPreference):
        default = "hello world!"

    preference = P()

    assert preference.field.initial == "hello world!"


def test_longstring_preference_widget(no_validate_names):
    class P(types.LongStringPreference):
        default = "hello world!"

    preference = P()

    assert isinstance(preference.field.widget, forms.Textarea) is True


def test_decimal_preference(no_validate_names):
    class P(types.DecimalPreference):
        default = decimal.Decimal("2.5")

    preference = P()

    assert preference.field.initial == decimal.Decimal("2.5")


def test_float_preference(no_validate_names):
    class P(types.FloatPreference):
        default = 0.35

    preference = P()

    assert preference.field.initial == 0.35
    assert preference.field.initial != 0.3
    assert preference.field.initial != 0.3001


def test_duration_preference(no_validate_names):
    class P(types.DurationPreference):
        default = timedelta(0)

    preference = P()

    assert preference.field.initial == timedelta(0)


def test_date_preference(no_validate_names):
    class P(types.DatePreference):
        default = date.today()

    preference = P()

    assert preference.field.initial == date.today()


def test_datetime_preference(no_validate_names):
    initial_date_time = datetime(2017, 10, 4, 23, 7, 20, 682380)

    class P(types.DateTimePreference):
        default = initial_date_time

    preference = P()

    assert preference.field.initial == initial_date_time


def test_time_preference(no_validate_names):
    class P(types.TimePreference):
        default = time(0)

    preference = P()

    assert preference.field.initial == time(0)


def test_file_preference_defaults_to_none(no_validate_names):
    class P(types.FilePreference):
        pass

    preference = P()

    assert preference.field.initial is None


def test_can_get_upload_path(no_validate_names):
    class P(types.FilePreference):
        pass

    p = P()

    assert p.get_upload_path() == (
        preferences_settings.FILE_PREFERENCE_UPLOAD_DIR + "/" + p.identifier()
    )


def test_file_preference_store_file_path(db):
    f = SimpleUploadedFile(
        "test_file_1ce410e5-6814-4910-afd7-be1486d3644f.txt",
        "hello world".encode("utf-8"),
    )
    p = global_preferences_registry.get(section="blog", name="logo")
    manager = global_preferences_registry.manager()
    manager["blog__logo"] = f
    assert manager["blog__logo"].read() == b"hello world"
    assert manager["blog__logo"].url == os.path.join(
        settings.MEDIA_URL, p.get_upload_path(), f.name
    )

    assert manager["blog__logo"].path == os.path.join(
        settings.MEDIA_ROOT, p.get_upload_path(), f.name
    )


def test_file_preference_conflicting_file_names(db):
    """
    f2 should have a different file name to f, since Django storage needs
    to differentiate between the two
    """
    f = SimpleUploadedFile(
        "test_file_c95d02ef-0e5d-4d36-98c0-1b54505860d0.txt",
        "hello world".encode("utf-8"),
    )
    f2 = SimpleUploadedFile(
        "test_file_c95d02ef-0e5d-4d36-98c0-1b54505860d0.txt",
        "hello world 2".encode("utf-8"),
    )
    manager = global_preferences_registry.manager()

    manager["blog__logo"] = f
    manager["blog__logo2"] = f2

    assert manager["blog__logo2"].read() == b"hello world 2"
    assert manager["blog__logo"].read() == b"hello world"

    assert manager["blog__logo"].url != manager["blog__logo2"].url
    assert manager["blog__logo"].path != manager["blog__logo2"].path


def test_can_delete_file_preference(db):
    f = SimpleUploadedFile(
        "test_file_bf2e72ef-092f-4a71-9cda-f2442d6166d0.txt",
        "hello world".encode("utf-8"),
    )
    p = global_preferences_registry.get(section="blog", name="logo")
    manager = global_preferences_registry.manager()
    manager["blog__logo"] = f
    path = os.path.join(settings.MEDIA_ROOT, p.get_upload_path(), f.name)
    assert os.path.exists(path) is True
    manager["blog__logo"].delete()
    assert os.path.exists(path) is False


def test_file_preference_api_repr_returns_path(db):
    f = SimpleUploadedFile(
        "test_file_24485a80-8db9-4191-ae49-da7fe2013794.txt",
        "hello world".encode("utf-8"),
    )
    p = global_preferences_registry.get(section="blog", name="logo")
    manager = global_preferences_registry.manager()
    manager["blog__logo"] = f

    f = manager["blog__logo"]
    assert p.api_repr(f) == f.url


def test_file_preference_if_pickleable(db):
    manager = global_preferences_registry.manager()
    f = SimpleUploadedFile(
        "test_file_24485a80-8db9-4191-ae49-da7fe2013794.txt",
        "hello world".encode("utf-8"),
    )
    try:
        manager["blog__logo"] = f
        pickle.dumps(manager["blog__logo"])
    except Exception:
        pytest.fail("FilePreference not pickleable")


def test_choice_preference(fake_user):
    fake_user.preferences["user__favorite_vegetable"] = "C"
    assert fake_user.preferences["user__favorite_vegetable"] == "C"
    fake_user.preferences["user__favorite_vegetable"] = "P"
    assert fake_user.preferences["user__favorite_vegetable"] == "P"

    with pytest.raises(forms.ValidationError):
        fake_user.preferences["user__favorite_vegetable"] = "Nope"


def test_multiple_choice_preference(fake_user):
    fake_user.preferences["user__favorite_vegetables"] = ["C", "T"]
    assert fake_user.preferences["user__favorite_vegetables"] == ["C", "T"]
    fake_user.preferences["user__favorite_vegetables"] = ["P"]
    assert fake_user.preferences["user__favorite_vegetables"] == ["P"]

    with pytest.raises(forms.ValidationError):
        fake_user.preferences["user__favorite_vegetables"] = ["Nope", "C"]


def test_model_choice_preference(blog_entry):
    global_preferences = global_preferences_registry.manager()
    global_preferences["blog__featured_entry"] = blog_entry

    in_db = GlobalPreferenceModel.objects.get(section="blog", name="featured_entry")
    assert in_db.value == blog_entry
    assert in_db.raw_value == str(blog_entry.pk)


def test_deleting_model_also_delete_preference(blog_entry):
    global_preferences = global_preferences_registry.manager()
    global_preferences["blog__featured_entry"] = blog_entry

    assert len(signals.pre_delete.receivers) > 0

    blog_entry.delete()

    with pytest.raises(GlobalPreferenceModel.DoesNotExist):
        GlobalPreferenceModel.objects.get(section="blog", name="featured_entry")