import os
from pathlib import Path
from dotenv import load_dotenv

BASE_DIR = Path(__file__).resolve().parent.parent
load_dotenv(BASE_DIR.parent / '.env')

SECRET_KEY = os.environ.get('SECRET_KEY', 'django-insecure-your-secret-key-here')
DEBUG = os.environ.get('DEBUG', 'True') == 'True'
ALLOWED_HOSTS = ['localhost', '127.0.0.1']

INSTALLED_APPS = [
    'daphne',                      # must load first: makes `runserver` ASGI/WebSocket-aware
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'corsheaders',
    'rest_framework',
    'channels',
    'testing_app',
    'api',
]

MIDDLEWARE = [
    'corsheaders.middleware.CorsMiddleware',
    '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',
    'django.middleware.clickjacking.XFrameOptionsMiddleware',
]

ROOT_URLCONF = 'yatra_testing.urls'

TEMPLATES = [
    {
        'BACKEND': 'django.template.backends.django.DjangoTemplates',
        'DIRS': [BASE_DIR / 'templates'],
        '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 = 'yatra_testing.wsgi.application'
ASGI_APPLICATION = 'yatra_testing.asgi.application'

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.mysql',
        'NAME': os.environ.get('DB_NAME', 'yatra_booking'),
        'USER': os.environ.get('DB_USER', 'root'),
        'PASSWORD': os.environ.get('DB_PASSWORD', ''),
        'HOST': os.environ.get('DB_HOST', 'localhost'),
        'PORT': os.environ.get('DB_PORT', '3306'),
        'OPTIONS': {
            'init_command': "SET sql_mode='STRICT_TRANS_TABLES'",
        },
    }
}

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/'
STATICFILES_DIRS = [BASE_DIR / 'static']
STATIC_ROOT = BASE_DIR / 'staticfiles'
MEDIA_URL = '/media/'
MEDIA_ROOT = BASE_DIR / 'media'

DEFAULT_AUTO_FIELD = 'django.db.models.BigAutoField'

CORS_ALLOW_ALL_ORIGINS = True

# ---------- Email (Gmail SMTP) for OTP login ----------
EMAIL_BACKEND = 'django.core.mail.backends.smtp.EmailBackend'
EMAIL_HOST = 'smtp.gmail.com'
EMAIL_PORT = 465
EMAIL_USE_SSL = True
EMAIL_HOST_USER = 'hexahacks0@gmail.com'
EMAIL_HOST_PASSWORD = 'vhldeibpfgumsgci'  # Gmail app password (spaces removed)
DEFAULT_FROM_EMAIL = 'Yatra Booking <hexahacks0@gmail.com>'

# ---------- Google OAuth (operator login) ----------
GOOGLE_CLIENT_ID = '693666064762-d5ftfeohkio30pihgdrllpk0lko6t1lc.apps.googleusercontent.com'
GOOGLE_CLIENT_SECRET = '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'
GOOGLE_CALLBACK_URL = 'http://localhost:8000/api/v1/auth/google/callback'

SESSION_COOKIE_AGE = 7 * 24 * 60 * 60   # 7 days in seconds
SESSION_EXPIRE_AT_BROWSER_CLOSE = False

# ---------- Redis (Channels channel layer) ----------
# When using Upstash, set REDIS_URL to your Upstash connection string.
# If no env var is provided, the Upstash default URL below will be used.
REDIS_URL = os.environ.get(
    'REDIS_URL',
    'rediss://default:gQAAAAAAAidHAAIgcDJkYWRkM2U4MjEyMmQ0YmI5ODI0M2ViNTRmZDI0MWRmZQ@in-whippet-141127.upstash.io:6379'
)

CHANNEL_LAYERS = {
    'default': {
        'BACKEND': 'channels_redis.core.RedisChannelLayer',
        'CONFIG': {'hosts': [REDIS_URL]},
    },
}

# ---------- Django REST Framework ----------
REST_FRAMEWORK = {
    'DEFAULT_AUTHENTICATION_CLASSES': [
        'api.jwt_auth.YatraJWTAuthentication',
    ],
    'DEFAULT_PERMISSION_CLASSES': [
        'rest_framework.permissions.AllowAny',  # jwt_required() is the real gatekeeper below
    ],
    'DEFAULT_PAGINATION_CLASS': 'rest_framework.pagination.PageNumberPagination',
    'PAGE_SIZE': 200,  # generous default so existing unpaginated client behaviour is unaffected
    'EXCEPTION_HANDLER': 'api.jwt_auth.yatra_exception_handler',
}

# ---------- SimpleJWT ----------
from datetime import timedelta
SIMPLE_JWT = {
    'ACCESS_TOKEN_LIFETIME': timedelta(minutes=30),
    'REFRESH_TOKEN_LIFETIME': timedelta(days=7),   # matches the 1-week session policy
    'ROTATE_REFRESH_TOKENS': True,
    'BLACKLIST_AFTER_ROTATION': True,
    'UPDATE_LAST_LOGIN': False,
    'ALGORITHM': 'HS256',
    'SIGNING_KEY': SECRET_KEY,
    'AUTH_HEADER_TYPES': ('Bearer',),
    'USER_ID_FIELD': 'id',
    'USER_ID_CLAIM': 'user_id',
}

DEVICE_TRUST_DAYS = 7  # operator OTP is skipped on a remembered browser for this long
SEAT_LOCK_MINUTES = 10  # BR-1: how long a selected seat is held before release

# ---------- eSewa ePay v2 (sandbox / UAT credentials) ----------
# To go live: swap these four values for your production merchant credentials.
# Nothing else in the codebase needs to change.
ESEWA_SETTINGS = {
    'PRODUCT_CODE': 'EPAYTEST',
    'SECRET_KEY': '8gBm/:&EnhH.1/q',
    'FORM_URL': 'https://rc-epay.esewa.com.np/api/epay/main/v2/form',
    'STATUS_CHECK_URL': 'https://rc.esewa.com.np/api/epay/transaction/status/',
    # Production values (uncomment when merchant account is approved):
    # 'FORM_URL': 'https://epay.esewa.com.np/api/epay/main/v2/form',
    # 'STATUS_CHECK_URL': 'https://esewa.com.np/api/epay/transaction/status/',
}