from .hydrators import dehydrate_value
from .utils import get_setting_value, has_custom_value


def migrate_settings_group(apps, group_fixture, old_group_key=None):
    SettingsGroup = apps.get_model("misago_conf", "SettingsGroup")
    Setting = apps.get_model("misago_conf", "Setting")
    group_key = group_fixture["key"]

    # Fetch settings group

    if old_group_key:
        group = get_group(SettingsGroup, old_group_key)
        custom_settings_values = get_custom_settings_values(group)
    else:
        group = get_group(SettingsGroup, group_key)
        if group.pk:
            custom_settings_values = get_custom_settings_values(group)
        else:
            custom_settings_values = {}

    # Update group's attributes

    group.key = group_fixture["key"]
    group.name = group_fixture["name"]
    if group_fixture.get("description"):
        group.description = group_fixture.get("description")
    group.save()

    # Delete groups settings and make new ones
    # Its easier to create news ones and then assign them old values

    group.setting_set.all().delete()

    for order, setting_fixture in enumerate(group_fixture["settings"]):
        old_value = custom_settings_values.pop(setting_fixture["setting"], None)
        migrate_setting(Setting, group, setting_fixture, order, old_value)


def get_group(SettingsGroup, group_key):
    try:
        return SettingsGroup.objects.get(key=group_key)
    except SettingsGroup.DoesNotExist:
        return SettingsGroup()


def get_custom_settings_values(group):
    custom_settings_values = {}

    for setting in group.setting_set.iterator():
        if has_custom_value(setting):
            custom_settings_values[setting.setting] = get_setting_value(setting)

    return custom_settings_values


def migrate_setting(Setting, group, setting_fixture, order, old_value):
    setting_fixture["group"] = group
    setting_fixture["order"] = order

    setting_fixture["name"] = setting_fixture["name"]
    if setting_fixture.get("description"):
        setting_fixture["description"] = setting_fixture.get("description")

    if setting_fixture.get("field_extra") and setting_fixture.get("field_extra").get(
        "choices"
    ):
        untranslated_choices = setting_fixture["field_extra"]["choices"]
        translated_choices = []
        for val, name in untranslated_choices:
            translated_choices.append((val, name))
        setting_fixture["field_extra"]["choices"] = tuple(translated_choices)

    if old_value is None:
        value = setting_fixture.pop("value", None)
    else:
        value = old_value
    setting_fixture.pop("value", None)

    field_extra = setting_fixture.pop("field_extra", None)

    setting = Setting(**setting_fixture)
    setting.dry_value = dehydrate_value(setting.python_type, value)

    if setting_fixture.get("default_value"):
        setting.default_value = dehydrate_value(
            setting.python_type, setting_fixture.get("default_value")
        )

    setting.field_extra = field_extra or {}

    setting.save()