"""Django settings for Jimeng Clone backend."""

import os
from pathlib import Path
from datetime import timedelta

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

SECRET_KEY = os.environ.get(
    'DJANGO_SECRET_KEY',
    'django-insecure-dev-key-change-in-production-jimeng-clone-2026'
)

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

ALLOWED_HOSTS = os.environ.get('DJANGO_ALLOWED_HOSTS', 'localhost,127.0.0.1').split(',')

INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    # Third party
    'rest_framework',
    'corsheaders',
    # Local apps
    'apps.accounts',
    'apps.generation',
]

MIDDLEWARE = [
    'utils.log_center.LogCenterMiddleware',
    'django.middleware.security.SecurityMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'corsheaders.middleware.CorsMiddleware',
    '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'

# Database configuration
# TESTING=true → isolated test_db.sqlite3 (never pollutes dev data)
# USE_MYSQL=true → Aliyun RDS MySQL (production)
# Otherwise → SQLite db.sqlite3 (local dev)
TESTING = os.environ.get('TESTING', 'false').lower() in ('true', '1', 'yes')

if TESTING:
    DATABASES = {
        'default': {
            'ENGINE': 'django.db.backends.sqlite3',
            'NAME': BASE_DIR / 'test_db.sqlite3',
        }
    }
elif os.environ.get('USE_MYSQL', 'false').lower() in ('true', '1', 'yes'):
    DATABASES = {
        'default': {
            'ENGINE': 'django.db.backends.mysql',
            'NAME': os.environ.get('DB_NAME', 'video_auto'),
            'USER': os.environ.get('DB_USER', 'ai_video'),
            'PASSWORD': os.environ.get('DB_PASSWORD', 'JogNQdtrd3WY8CBCAiYfYEGx'),
            'HOST': os.environ.get('DB_HOST', 'rm-7xv1uaw910558p1788o.mysql.rds.aliyuncs.com'),
            'PORT': os.environ.get('DB_PORT', '3306'),
            'OPTIONS': {
                'charset': 'utf8mb4',
                'init_command': "SET sql_mode='STRICT_TRANS_TABLES'",
            },
        }
    }
else:
    DATABASES = {
        'default': {
            'ENGINE': 'django.db.backends.sqlite3',
            'NAME': BASE_DIR / 'db.sqlite3',
        }
    }

AUTH_USER_MODEL = 'accounts.User'

AUTH_PASSWORD_VALIDATORS = [
    {'NAME': 'django.contrib.auth.password_validation.MinimumLengthValidator', 'OPTIONS': {'min_length': 6}},
]

# REST Framework
REST_FRAMEWORK = {
    'DEFAULT_AUTHENTICATION_CLASSES': (
        'rest_framework_simplejwt.authentication.JWTAuthentication',
    ),
    'DEFAULT_PERMISSION_CLASSES': (
        'rest_framework.permissions.IsAuthenticated',
    ),
    'DEFAULT_RENDERER_CLASSES': (
        'rest_framework.renderers.JSONRenderer',
    ),
    'EXCEPTION_HANDLER': 'utils.log_center.custom_exception_handler',
}

# JWT settings
SIMPLE_JWT = {
    'ACCESS_TOKEN_LIFETIME': timedelta(hours=2),
    'REFRESH_TOKEN_LIFETIME': timedelta(days=7),
    'ROTATE_REFRESH_TOKENS': False,
    'AUTH_HEADER_TYPES': ('Bearer',),
}

# CORS
CORS_ALLOWED_ORIGINS = [
    'http://localhost:5173',
    'http://127.0.0.1:5173',
    'http://localhost:3000',
]
_extra_cors = os.environ.get('CORS_ALLOWED_ORIGINS', '')
if _extra_cors:
    CORS_ALLOWED_ORIGINS += [o.strip() for o in _extra_cors.split(',') if o.strip()]
CORS_ALLOW_CREDENTIALS = True

CSRF_TRUSTED_ORIGINS = [o for o in CORS_ALLOWED_ORIGINS if o.startswith('https://')]

LANGUAGE_CODE = 'zh-hans'
TIME_ZONE = 'Asia/Shanghai'
USE_I18N = True
USE_TZ = True

STATIC_URL = 'static/'
STATIC_ROOT = BASE_DIR / 'staticfiles'

DEFAULT_AUTO_FIELD = 'django.db.models.BigAutoField'

# ──────────────────────────────────────────────
# TOS (Volcano Engine Object Storage)
# ──────────────────────────────────────────────
TOS_ACCESS_KEY = os.environ.get('TOS_ACCESS_KEY', 'AKLTYjVlOTQwOWFkZDY4NGNhMmFkZGRhODQzMTUwNmIxOTM')
TOS_SECRET_KEY = os.environ.get('TOS_SECRET_KEY', 'TlRFMU5EUmtNamxsWlRsaU5HSXdPV0l6TVRBeVpqWTNNR00xT1RZNE0yRQ==')
TOS_ENDPOINT = os.environ.get('TOS_ENDPOINT', 'https://tos-cn-guangzhou.volces.com')
TOS_S3_ENDPOINT = os.environ.get('TOS_S3_ENDPOINT', 'https://tos-s3-cn-guangzhou.volces.com')
TOS_BUCKET = os.environ.get('TOS_BUCKET', 'video-huoshan')
TOS_REGION = os.environ.get('TOS_REGION', 'cn-guangzhou')
TOS_CDN_DOMAIN = os.environ.get('TOS_CDN_DOMAIN', 'https://video-huoshan.tos-cn-guangzhou.volces.com')

# ──────────────────────────────────────────────
# Seedance API (Volcano Engine ARK)
# ──────────────────────────────────────────────
ARK_API_KEY = os.environ.get('ARK_API_KEY', '846b6981-9954-4c58-bb39-63079393bdb8')
ARK_BASE_URL = os.environ.get('ARK_BASE_URL', 'https://ark.cn-beijing.volces.com/api/v3')
# Set to True when Seedance model is activated on ARK platform
SEEDANCE_ENABLED = os.environ.get('SEEDANCE_ENABLED', 'false').lower() == 'true'