"""
Django settings for config project.

Generated by 'django-admin startproject' using Django 5.2.15.

For more information on this file, see
https://docs.djangoproject.com/en/5.2/topics/settings/

For the full list of settings and their values, see
https://docs.djangoproject.com/en/5.2/ref/settings/
"""

import os
from decimal import Decimal
from pathlib import Path

# Build paths inside the project like this: BASE_DIR / 'subdir'.
BASE_DIR = Path(__file__).resolve().parent.parent


# Quick-start development settings - unsuitable for production
# See https://docs.djangoproject.com/en/5.2/howto/deployment/checklist/

def load_dotenv(path: Path) -> None:
    if not path.exists():
        return
    for raw_line in path.read_text(encoding="utf-8-sig").splitlines():
        line = raw_line.strip()
        if not line or line.startswith("#") or "=" not in line:
            continue
        key, value = line.split("=", 1)
        os.environ.setdefault(key.strip(), value.strip().strip('"').strip("'"))


def env_bool(name: str, default: bool = False) -> bool:
    value = os.environ.get(name)
    if value is None:
        return default
    return value.strip().lower() in {"1", "true", "yes", "on"}


def env_list(name: str, default: str = "") -> list[str]:
    value = os.environ.get(name, default)
    return [item.strip() for item in value.split(",") if item.strip()]


def env_int(name: str, default: int) -> int:
    value = os.environ.get(name)
    if not value:
        return default
    return int(value)


def env_decimal(name: str, default: str) -> Decimal:
    value = os.environ.get(name)
    if not value:
        value = default
    return Decimal(value)


load_dotenv(BASE_DIR / ".env")

# SECURITY WARNING: keep the secret key used in production secret.
SECRET_KEY = os.environ.get("DJANGO_SECRET_KEY", "django-insecure-dev-only-change-me")
AI_KEY_ENCRYPTION_KEY = os.environ.get("AI_KEY_ENCRYPTION_KEY", "")

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

PAYMENT_CALLBACK_MODE = os.environ.get(
    "PAYMENT_CALLBACK_MODE",
    "mock" if DEBUG else "sdk",
).strip().lower()
PAYMENT_MOCK_CALLBACK_SECRET = os.environ.get(
    "PAYMENT_MOCK_CALLBACK_SECRET",
    "cmhub-dev-mock-callback-secret" if DEBUG else "",
)
PAYMENT_QR_EXPIRES_MINUTES = env_int("PAYMENT_QR_EXPIRES_MINUTES", 10)
EMAIL_BACKEND = os.environ.get(
    "DJANGO_EMAIL_BACKEND",
    "django.core.mail.backends.console.EmailBackend",
)
DEFAULT_FROM_EMAIL = os.environ.get("DJANGO_DEFAULT_FROM_EMAIL", "noreply@cmhub.local")
WECHAT_PAY_APPID = os.environ.get("WECHAT_PAY_APPID", "")
WECHAT_PAY_MCHID = os.environ.get("WECHAT_PAY_MCHID", "")
WECHAT_PAY_API_V3_KEY = os.environ.get("WECHAT_PAY_API_V3_KEY", "")
WECHAT_PAY_CERT_SERIAL_NO = os.environ.get("WECHAT_PAY_CERT_SERIAL_NO", "")
WECHAT_PAY_PRIVATE_KEY_PATH = os.environ.get("WECHAT_PAY_PRIVATE_KEY_PATH", "")
WECHAT_PAY_NOTIFY_URL = os.environ.get("WECHAT_PAY_NOTIFY_URL", "")
ALIPAY_APPID = os.environ.get("ALIPAY_APPID", "")
ALIPAY_APP_PRIVATE_KEY_PATH = os.environ.get("ALIPAY_APP_PRIVATE_KEY_PATH", "")
ALIPAY_PUBLIC_KEY_PATH = os.environ.get("ALIPAY_PUBLIC_KEY_PATH", "")
ALIPAY_NOTIFY_URL = os.environ.get("ALIPAY_NOTIFY_URL", "")
ALIPAY_DEBUG = env_bool("ALIPAY_DEBUG", False)

ALLOWED_HOSTS = env_list("DJANGO_ALLOWED_HOSTS", "127.0.0.1,localhost,testserver")
CSRF_TRUSTED_ORIGINS = env_list("DJANGO_CSRF_TRUSTED_ORIGINS", "")
SESSION_COOKIE_SECURE = env_bool("DJANGO_SESSION_COOKIE_SECURE", not DEBUG)
CSRF_COOKIE_SECURE = env_bool("DJANGO_CSRF_COOKIE_SECURE", not DEBUG)
SECURE_SSL_REDIRECT = env_bool("DJANGO_SECURE_SSL_REDIRECT", False)
SECURE_HSTS_SECONDS = env_int("DJANGO_SECURE_HSTS_SECONDS", 0)
SECURE_HSTS_INCLUDE_SUBDOMAINS = env_bool(
    "DJANGO_SECURE_HSTS_INCLUDE_SUBDOMAINS",
    False,
)
SECURE_HSTS_PRELOAD = env_bool("DJANGO_SECURE_HSTS_PRELOAD", False)
SECURE_PROXY_SSL_HEADER = (
    ("HTTP_X_FORWARDED_PROTO", "https")
    if env_bool("DJANGO_SECURE_PROXY_SSL_HEADER", False)
    else None
)

API_GENERATE_THROTTLE_RATE = os.environ.get("API_GENERATE_THROTTLE_RATE", "60/min")
API_AUTH_FAILURE_THROTTLE_RATE = os.environ.get("API_AUTH_FAILURE_THROTTLE_RATE", "30/min")
IMAGE_URL_MAX_BYTES = env_int("IMAGE_URL_MAX_BYTES", 10 * 1024 * 1024)
IMAGE_URL_MAX_REDIRECTS = env_int("IMAGE_URL_MAX_REDIRECTS", 3)
IMAGE_URL_CONNECT_TIMEOUT_SECONDS = env_int("IMAGE_URL_CONNECT_TIMEOUT_SECONDS", 10)
IMAGE_URL_READ_TIMEOUT_SECONDS = env_int("IMAGE_URL_READ_TIMEOUT_SECONDS", 60)
RECHARGE_MAX_AMOUNT_CNY = env_decimal("RECHARGE_MAX_AMOUNT_CNY", "100000.00")
MODERATION_ENABLED = env_bool("MODERATION_ENABLED", False)
MODERATION_PROVIDER = os.environ.get("MODERATION_PROVIDER", "keyword").strip().lower()
MODERATION_FAIL_CLOSED = env_bool("MODERATION_FAIL_CLOSED", True)
MODERATION_BLOCK_ON_REVIEW = env_bool("MODERATION_BLOCK_ON_REVIEW", False)
MODERATION_CACHE_VERSION_KEY = os.environ.get(
    "MODERATION_CACHE_VERSION_KEY",
    "moderation:sensitive_words:version",
)


# Application definition

INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'allauth',
    'allauth.account',
    'rest_framework',
    'apps.users',
    'apps.portal',
    'apps.billing',
    'apps.ai',
    'apps.moderation',
    'apps.api',
]

REST_FRAMEWORK = {
    "DEFAULT_AUTHENTICATION_CLASSES": [],
    "DEFAULT_PERMISSION_CLASSES": [
        "rest_framework.permissions.IsAuthenticated",
    ],
    "DEFAULT_THROTTLE_RATES": {
        "generate": API_GENERATE_THROTTLE_RATE,
        "api_auth_failure": API_AUTH_FAILURE_THROTTLE_RATE,
    },
    "EXCEPTION_HANDLER": "apps.api.exceptions.api_exception_handler",
}

MIDDLEWARE = [
    'django.middleware.security.SecurityMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.common.CommonMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'allauth.account.middleware.AccountMiddleware',
    'django.middleware.clickjacking.XFrameOptionsMiddleware',
]

ROOT_URLCONF = 'config.urls'

TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'DIRS': [BASE_DIR / 'apps' / 'portal' / 'templates'],
        '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'

AUTH_USER_MODEL = 'users.User'
AUTHENTICATION_BACKENDS = [
    'django.contrib.auth.backends.ModelBackend',
    'allauth.account.auth_backends.AuthenticationBackend',
]

LOGIN_URL = "/login"
LOGIN_REDIRECT_URL = "/dashboard"
LOGOUT_REDIRECT_URL = "/login"

ACCOUNT_ADAPTER = "apps.portal.adapters.CmhubAccountAdapter"
ACCOUNT_EMAIL_VERIFICATION = "none"
ACCOUNT_UNIQUE_EMAIL = True
ACCOUNT_LOGIN_METHODS = {"email", "username"}
ACCOUNT_SIGNUP_FIELDS = ["username*", "email*", "password1*", "password2*"]
ACCOUNT_LOGIN_ON_EMAIL_CONFIRMATION = False
ACCOUNT_EMAIL_CONFIRMATION_ANONYMOUS_REDIRECT_URL = "/login"
ACCOUNT_EMAIL_CONFIRMATION_AUTHENTICATED_REDIRECT_URL = "/dashboard"
ACCOUNT_EMAIL_SUBJECT_PREFIX = "[cmhub] "


# Database
# https://docs.djangoproject.com/en/5.2/ref/settings/#databases

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.mysql',
        'HOST': os.environ.get('MYSQL_HOST', '127.0.0.1'),
        'PORT': env_int('MYSQL_PORT', 3306),
        'NAME': os.environ.get('MYSQL_DATABASE', 'cmhub'),
        'USER': os.environ.get('MYSQL_USER', ''),
        'PASSWORD': os.environ.get('MYSQL_PASSWORD', ''),
        'OPTIONS': {
            'charset': os.environ.get('MYSQL_CHARSET', 'utf8mb4'),
            'connect_timeout': env_int('MYSQL_CONNECT_TIMEOUT', 30),
            'read_timeout': env_int('MYSQL_READ_TIMEOUT', 120),
            'write_timeout': env_int('MYSQL_WRITE_TIMEOUT', 120),
            'init_command': "SET sql_mode='STRICT_TRANS_TABLES'",
        },
    }
}

CACHES = {
    "default": {
        "BACKEND": os.environ.get(
            "DJANGO_CACHE_BACKEND",
            "django.core.cache.backends.locmem.LocMemCache",
        ),
        "LOCATION": os.environ.get("DJANGO_CACHE_LOCATION", "cmhub-local-cache"),
    }
}


# Password validation
# https://docs.djangoproject.com/en/5.2/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',
    },
]


# Internationalization
# https://docs.djangoproject.com/en/5.2/topics/i18n/

LANGUAGE_CODE = 'zh-hans'

TIME_ZONE = os.environ.get('DJANGO_TIME_ZONE', 'Asia/Shanghai')

USE_I18N = True

USE_TZ = True


# Static files (CSS, JavaScript, Images)
# https://docs.djangoproject.com/en/5.2/howto/static-files/

STATIC_URL = os.environ.get("STATIC_URL", "/static/")
STATIC_ROOT = os.environ.get("STATIC_ROOT", str(BASE_DIR / "staticfiles"))

MEDIA_ROOT = os.environ.get("MEDIA_ROOT", str(BASE_DIR / "media"))
MEDIA_URL = os.environ.get("MEDIA_URL", "/media/")

# Default primary key field type
# https://docs.djangoproject.com/en/5.2/ref/settings/#default-auto-field

DEFAULT_AUTO_FIELD = 'django.db.models.BigAutoField'