"""
Django settings para o SIFER (piloto).

Segredos e configuração de ambiente são lidos de variáveis de ambiente
(ficheiro `.env` via python-dotenv). Nunca colocar valores reais no código.
"""

import os
from pathlib import Path

from dotenv import load_dotenv

# Caminhos do projecto
BASE_DIR = Path(__file__).resolve().parent.parent

# Carrega variáveis de ambiente do ficheiro .env (se existir)
load_dotenv(BASE_DIR / ".env")


def _csv(value: str) -> list[str]:
    """Converte uma string separada por vírgulas numa lista limpa."""
    return [item.strip() for item in value.split(",") if item.strip()]


# ---------------------------------------------------------------- segurança
SECRET_KEY = os.environ.get(
    "DJANGO_SECRET_KEY",
    "django-insecure-dev-only-change-me",
)

DEBUG = os.environ.get("DJANGO_DEBUG", "True").lower() in ("1", "true", "yes")

ALLOWED_HOSTS = _csv(
    os.environ.get("DJANGO_ALLOWED_HOSTS", "localhost,127.0.0.1")
)

# A simulação de demonstração segue o DEBUG por defeito, mas pode ser forçada
# via variável de ambiente. Em produção deve permanecer desactivada.
SIMULATION_ENABLED = os.environ.get(
    "SIMULATION_ENABLED", str(DEBUG)
).lower() in ("1", "true", "yes")

# ------------------------------------------------------------------ apps
INSTALLED_APPS = [
    "django.contrib.admin",
    "django.contrib.auth",
    "django.contrib.contenttypes",
    "django.contrib.sessions",
    "django.contrib.messages",
    "django.contrib.staticfiles",
    # Terceiros
    "rest_framework",
    "corsheaders",
    "django_filters",
    # SIFER
    "apps.accounts",
    "apps.corridors",
    "apps.infrastructure",
    "apps.trains",
    "apps.incidents",
    "apps.audit",
    "apps.simulation",
    "apps.dashboard",
]

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

ROOT_URLCONF = "config.urls"

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

WSGI_APPLICATION = "config.wsgi.application"

# ------------------------------------------------------------ base de dados
DATABASES = {
    "default": {
        "ENGINE": "django.db.backends.sqlite3",
        "NAME": BASE_DIR / "db.sqlite3",
    }
}

# ------------------------------------------------------------- autenticação
AUTH_USER_MODEL = "accounts.User"

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",
    },
]

# ------------------------------------------------------------------- DRF
REST_FRAMEWORK = {
    "DEFAULT_AUTHENTICATION_CLASSES": [
        "rest_framework_simplejwt.authentication.JWTAuthentication",
    ],
    "DEFAULT_PERMISSION_CLASSES": [
        "rest_framework.permissions.IsAuthenticated",
    ],
    "DEFAULT_FILTER_BACKENDS": [
        "django_filters.rest_framework.DjangoFilterBackend",
        "rest_framework.filters.OrderingFilter",
        "rest_framework.filters.SearchFilter",
    ],
    "DEFAULT_PAGINATION_CLASS": "rest_framework.pagination.PageNumberPagination",
    "PAGE_SIZE": 50,
}

# Simple JWT
from datetime import timedelta  # noqa: E402

SIMPLE_JWT = {
    "ACCESS_TOKEN_LIFETIME": timedelta(minutes=60),
    "REFRESH_TOKEN_LIFETIME": timedelta(days=1),
    "ROTATE_REFRESH_TOKENS": True,
    "BLACKLIST_AFTER_ROTATION": False,
    "AUTH_HEADER_TYPES": ("Bearer",),
}

# -------------------------------------------------------------------- CORS
CORS_ALLOWED_ORIGINS = _csv(
    os.environ.get(
        "CORS_ALLOWED_ORIGINS",
        "http://localhost:5173,http://127.0.0.1:5173",
    )
)

# ---------------------------------------------------------- internacionalização
LANGUAGE_CODE = "pt"
TIME_ZONE = "Africa/Luanda"
USE_I18N = True
USE_TZ = True

# ---------------------------------------------------------------- estáticos
STATIC_URL = "static/"

DEFAULT_AUTO_FIELD = "django.db.models.BigAutoField"