"""
Django settings for ucast project.

Generated by 'django-admin startproject' using Django 4.0.4.

For more information on this file, see
https://docs.djangoproject.com/en/4.0/topics/settings/

For the full list of settings and their values, see
https://docs.djangoproject.com/en/4.0/ref/settings/
"""

import os
import time
from importlib import resources
from pathlib import Path

import dotenv

VAR_PREFIX = "UCAST_"


def get_env(name, default=None):
    val_raw = os.environ.get(VAR_PREFIX + name, default)

    if default is not None:
        return type(default)(val_raw)

    return val_raw


def get_env_path(name, default=None):
    raw_env = get_env(name)
    if not raw_env:
        folder = default
    else:
        folder = Path(raw_env).absolute()
    os.makedirs(folder, exist_ok=True)
    return folder


def get_env_list(name):
    raw_env = get_env(name)
    if not raw_env:
        return []
    return [i.strip() for i in raw_env.split(",")]


def _load_dotenv() -> Path:
    """
    Look for a .env file in the current working directory or
    its parent directories.

    The directory containing the .env file becomes the application
    working directory, if no ``UCAST_WORKDIR`` environment variable
    is present.

    :return: Application working directory
    """
    dotenv_path = dotenv.find_dotenv()
    default_workdir = Path().resolve()

    if dotenv_path:
        dotenv.load_dotenv(dotenv_path)
        default_workdir = Path(dotenv_path).resolve().parent

    os.chdir(default_workdir)

    env_workdir = get_env("WORKDIR")
    if env_workdir:
        env_workdir_path = Path(env_workdir).resolve()
        os.makedirs(env_workdir_path, exist_ok=True)
        os.chdir(env_workdir_path)
        return env_workdir_path

    return default_workdir


# Build paths inside the project like this: BASE_DIR / 'subdir'.
BASE_DIR = _load_dotenv()

# SECURITY WARNING: keep the secret key used in production secret!
# generate with openssl rand -base64 64
SECRET_KEY = get_env(
    "SECRET_KEY", "django-insecure-$b25pq-s+(_zx2!2$+i+^0$kft0&y3kwmj7j5a#d_jop)$d061"
)

# SECURITY WARNING: don't run with debug turned on in production!
DEBUG = get_env("DEBUG", False)

ALLOWED_HOSTS = get_env_list("ALLOWED_HOSTS")

# Application definition

INSTALLED_APPS = [
    "ucast",
    "django.contrib.admin",
    "django.contrib.auth",
    "django.contrib.contenttypes",
    "django.contrib.sessions",
    "django.contrib.messages",
    "django.contrib.staticfiles",
    "bulma",
    "django_htmx",
]

MIDDLEWARE = [
    "django.middleware.security.SecurityMiddleware",
    "django.contrib.sessions.middleware.SessionMiddleware",
    "django.middleware.locale.LocaleMiddleware",
    "django.middleware.common.CommonMiddleware",
    "django.middleware.csrf.CsrfViewMiddleware",
    "django.contrib.auth.middleware.AuthenticationMiddleware",
    "django.contrib.messages.middleware.MessageMiddleware",
    "django.middleware.clickjacking.XFrameOptionsMiddleware",
    "django_htmx.middleware.HtmxMiddleware",
]

ROOT_URLCONF = "ucast_project.urls"

TEMPLATES = [
    {
        "BACKEND": "django.template.backends.django.DjangoTemplates",
        "DIRS": [],
        "APP_DIRS": True,
        "OPTIONS": {
            "context_processors": [
                "django.template.context_processors.debug",
                "django.template.context_processors.request",
                "django.contrib.auth.context_processors.auth",
                "django.contrib.messages.context_processors.messages",
                "ucast.template_context",
            ],
        },
    },
]

WSGI_APPLICATION = "ucast_project.wsgi.application"


def _get_db_config() -> dict:
    db_name = get_env("DB_NAME", "db")
    db_engine = get_env("DB_ENGINE", "sqlite")

    if db_engine == "sqlite":
        return {
            "ENGINE": "django.db.backends.sqlite3",
            "NAME": DB_DIR / f"{db_name}.sqlite",
            "OPTIONS": {
                "timeout": 20,
            },
        }

    db_port = get_env("DB_PORT")
    if not db_port:
        if db_engine == "postgresql":
            db_port = "5432"
        elif db_engine == "mysql":
            db_port = "3306"

    return {
        "ENGINE": f"django.db.backends.{db_engine}",
        "NAME": db_name,
        "USER": get_env("DB_USER"),
        "PASSWORD": get_env("DB_PASSWORD"),
        "HOST": get_env("DB_HOST", "127.0.0.1"),
        "PORT": db_port,
    }


# Static files (CSS, JavaScript, Images)
# https://docs.djangoproject.com/en/4.0/howto/static-files/

STATIC_URL = "static/"
STATIC_ROOT = get_env_path("STATIC_ROOT", BASE_DIR / "static")
DOWNLOAD_ROOT = get_env_path("DOWNLOAD_ROOT", BASE_DIR / "data")
CACHE_ROOT = get_env_path("CACHE_ROOT", BASE_DIR / "cache")
DB_DIR = get_env_path("DB_DIR", BASE_DIR / "db")

STATICFILES_DIRS = [resources.path("ucast", "static")]


# Database
# https://docs.djangoproject.com/en/4.0/ref/settings/#databases
DATABASES = {
    "default": _get_db_config(),
}

# Password validation
# https://docs.djangoproject.com/en/4.0/ref/settings/#auth-password-validators

AUTH_PASSWORD_VALIDATORS = [
    {
        "NAME": "django.contrib.auth.password_validation.UserAttributeSimilarityValidator",
    },
    {
        "NAME": "django.contrib.auth.password_validation.MinimumLengthValidator",
    },
    {
        "NAME": "django.contrib.auth.password_validation.CommonPasswordValidator",
    },
    {
        "NAME": "django.contrib.auth.password_validation.NumericPasswordValidator",
    },
]

AUTH_USER_MODEL = "ucast.user"

LOGIN_REDIRECT_URL = "/"
LOGOUT_REDIRECT_URL = "/"

# Internationalization
# https://docs.djangoproject.com/en/4.0/topics/i18n/

LANGUAGE_CODE = "en-us"

TIME_ZONE = get_env("TZ", time.tzname[0])

USE_I18N = True

USE_TZ = True

# Default primary key field type
# https://docs.djangoproject.com/en/4.0/ref/settings/#default-auto-field

DEFAULT_AUTO_FIELD = "django.db.models.BigAutoField"

REDIS_URL = get_env("REDIS_URL", "redis://localhost:6379")
REDIS_QUEUE_TIMEOUT = get_env("REDIS_QUEUE_TIMEOUT", 600)
REDIS_QUEUE_RESULT_TTL = 600

YT_UPDATE_INTERVAL = get_env("YT_UPDATE_INTERVAL", 900)
FEED_MAX_ITEMS = get_env("FEED_MAX_ITEMS", 100)

INTERNAL_FILES_ROOT = get_env("INTERNAL_FILES_ROOT", "internal_files")
INTERNAL_REDIRECT_HEADER = get_env("INTERNAL_REDIRECT_HEADER", "X-Accel-Redirect")