"""
Django settings for Voice Agent Backend.
Uses django-environ for env vars. Copy .env.example to .env.
"""
import os
from pathlib import Path

import environ

env = environ.Env(
    DEBUG=(bool, False),
    ALLOWED_HOSTS=(list, []),
    DATABASE_URL=(str, "postgresql://voicebot:vmc@localhost:5432/voicebot"),
    REDIS_URL=(str, "redis://localhost:6379/0"),
    LIVEKIT_URL=(str, "ws://localhost:7880"),
    LIVEKIT_API_KEY=(str, ""),
    LIVEKIT_API_SECRET=(str, ""),
)

BASE_DIR = Path(__file__).resolve().parent.parent
environ.Env.read_env(BASE_DIR / ".env")

SECRET_KEY = env("SECRET_KEY", default="change-me-in-production")
DEBUG = env("DEBUG", default=True)
ALLOWED_HOSTS = env.list("ALLOWED_HOSTS", default=["localhost", "127.0.0.1"])

INSTALLED_APPS = [
    "django.contrib.admin",
    "django.contrib.auth",
    "django.contrib.contenttypes",
    "django.contrib.sessions",
    "django.contrib.messages",
    "django.contrib.staticfiles",
    "rest_framework",
    "corsheaders",
    "apps.users",
    "apps.conversations",
    "apps.knowledge_base",
    "apps.agents",
]

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"
WSGI_APPLICATION = "config.wsgi.application"

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",
            ],
        },
    },
]

DATABASES = {"default": env.db()}

CACHES = {
    "default": {
        "BACKEND": "django_redis.cache.RedisCache",
        "LOCATION": env("REDIS_URL"),
        "OPTIONS": {"CLIENT_CLASS": "django_redis.client.DefaultClient"},
    }
}

CELERY_BROKER_URL = env("REDIS_URL")
CELERY_RESULT_BACKEND = env("REDIS_URL")

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 = "en-us"
TIME_ZONE = "UTC"
USE_I18N = True
USE_TZ = True
STATIC_URL = "static/"
DEFAULT_AUTO_FIELD = "django.db.models.BigAutoField"

REST_FRAMEWORK = {
    "DEFAULT_PERMISSION_CLASSES": ["rest_framework.permissions.AllowAny"],
    "DEFAULT_PAGINATION_CLASS": "rest_framework.pagination.PageNumberPagination",
    "PAGE_SIZE": 20,
}

CORS_ALLOW_ALL_ORIGINS = DEBUG

# LiveKit (local server)
LIVEKIT_URL = env("LIVEKIT_URL")
LIVEKIT_API_KEY = env("LIVEKIT_API_KEY")
LIVEKIT_API_SECRET = env("LIVEKIT_API_SECRET")