"""
Configuración del proyecto — Sistema de Evaluación Docente.

Base de datos: MySQL (administrada vía phpMyAdmin) por defecto.
Para desarrollo rápido sin servidor MySQL a mano, se puede forzar SQLite
con la variable de entorno DB_ENGINE=sqlite (ver .env.example).
"""
from datetime import timedelta
from pathlib import Path
from decouple import config, Csv

BASE_DIR = Path(__file__).resolve().parent.parent

SECRET_KEY = config("SECRET_KEY", default="dev-secret-key-cambiar-en-produccion")
DEBUG = config("DEBUG", default=True, cast=bool)
ALLOWED_HOSTS = config("ALLOWED_HOSTS", default="localhost,127.0.0.1", cast=Csv())

INSTALLED_APPS = [
    "django.contrib.admin",
    "django.contrib.auth",
    "django.contrib.contenttypes",
    "django.contrib.sessions",
    "django.contrib.messages",
    "django.contrib.staticfiles",

    "rest_framework",
    "rest_framework_simplejwt",
    "corsheaders",

    "evaluacion",
]

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.debug",
                "django.template.context_processors.request",
                "django.contrib.auth.context_processors.auth",
                "django.contrib.messages.context_processors.messages",
            ],
        },
    },
]

WSGI_APPLICATION = "config.wsgi.application"

# ---------------------------------------------------------------------------
# Base de datos
# ---------------------------------------------------------------------------
DB_ENGINE = config("DB_ENGINE", default="mysql")

if DB_ENGINE == "mysql":
    import pymysql
    pymysql.install_as_MySQLdb()

    DATABASES = {
        "default": {
            "ENGINE": "django.db.backends.mysql",
            "NAME": config("DB_NAME", default="evaluacion_docente"),
            "USER": config("DB_USER", default="root"),
            "PASSWORD": config("DB_PASSWORD", default=""),
            "HOST": config("DB_HOST", default="127.0.0.1"),
            "PORT": config("DB_PORT", default="3306"),
            "OPTIONS": {"charset": "utf8mb4"},
        }
    }
else:
    # Fallback para desarrollo/pruebas sin servidor MySQL disponible
    DATABASES = {
        "default": {
            "ENGINE": "django.db.backends.sqlite3",
            "NAME": BASE_DIR / "db.sqlite3",
        }
    }

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"},
]

LANGUAGE_CODE = "es"
TIME_ZONE = "America/La_Paz"
USE_I18N = True
USE_TZ = True

STATIC_URL = "static/"
STATIC_ROOT = BASE_DIR / "staticfiles"

MEDIA_URL = "media/"
MEDIA_ROOT = BASE_DIR / "media"

DEFAULT_AUTO_FIELD = "django.db.models.BigAutoField"

# ---------------------------------------------------------------------------
# Django REST Framework + JWT
# ---------------------------------------------------------------------------
REST_FRAMEWORK = {
    "DEFAULT_AUTHENTICATION_CLASSES": (
        "rest_framework_simplejwt.authentication.JWTAuthentication",
    ),
    "DEFAULT_PERMISSION_CLASSES": (
        "rest_framework.permissions.IsAuthenticated",
    ),
    "DEFAULT_PAGINATION_CLASS": "rest_framework.pagination.PageNumberPagination",
    "PAGE_SIZE": 50,
    "DEFAULT_THROTTLE_RATES": {
        # Aplicados solo a los endpoints publicos de encuesta (ver views.py),
        # no afectan al panel administrativo autenticado.
        "encuesta_lectura": "30/minute",
        "encuesta_envio": "10/minute",
    },
}

# Limite de tamano para archivos subidos (escudos, Excel) - 5 MB
DATA_UPLOAD_MAX_MEMORY_SIZE = 5 * 1024 * 1024
FILE_UPLOAD_MAX_MEMORY_SIZE = 5 * 1024 * 1024

SIMPLE_JWT = {
    "ACCESS_TOKEN_LIFETIME": timedelta(hours=8),
    "REFRESH_TOKEN_LIFETIME": timedelta(days=7),
    "ROTATE_REFRESH_TOKENS": True,
}

# ---------------------------------------------------------------------------
# CORS (frontend React/Vite)
# ---------------------------------------------------------------------------
CORS_ALLOWED_ORIGINS = config(
    "CORS_ALLOWED_ORIGINS",
    default="http://localhost:5173,http://127.0.0.1:5173",
    cast=Csv(),
)

# URL pública (frontend) a la que apuntan los QR generados
FRONTEND_ENCUESTA_URL = config(
    "FRONTEND_ENCUESTA_URL", default="http://localhost:5173/encuesta"
)