import os, secrets, argparse, django
from pathlib import Path
from django.core.management import call_command
from django.contrib.auth import get_user_model
from django.conf import settings
BASE_DIR = Path(__file__).resolve().parent

def write_settings(node_ip, lnd_tls_path, lnd_macaroon_path, lnd_database_path, lnd_network, lnd_rpc_server, lnd_max_message, whitenoise, debug, csrftrusted, nologinrequired, force_new, cookie_age):
    #Generate a unique secret to be used for your django site
    secret = secrets.token_urlsafe(64)
    if whitenoise:
        wnl = """
    'whitenoise.middleware.WhiteNoiseMiddleware',"""
    else:
        wnl = ''
    if csrftrusted:
        csrf = """
CSRF_TRUSTED_ORIGINS = ['%s']
    """ % (csrftrusted)
    else:
        csrf = ''
    if not nologinrequired:
        api_login = """
    'DEFAULT_PERMISSION_CLASSES': [
        'rest_framework.permissions.IsAuthenticated',
    ],"""
    else:
        print('WARNING: No password login option detected, LNDg will not require authentication...')
        api_login = ''
    settings_file = '''"""
Django settings for lndg project.

Generated by 'django-admin startproject' using Django {{ django_version }}.

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

For the full list of settings and their values, see
https://docs.djangoproject.com/en/{{ docs_version }}/ref/settings/
"""
import os
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/{{ docs_version }}/howto/deployment/checklist/

# SECURITY WARNING: keep the secret key used in production secret!
SECRET_KEY = '%s'

# SECURITY WARNING: don't run with debug turned on in production!
DEBUG = %s

ALLOWED_HOSTS = ['%s']
%s
LND_TLS_PATH = '%s'
LND_MACAROON_PATH = '%s'
LND_DATABASE_PATH = '%s'
LND_NETWORK = '%s'
LND_RPC_SERVER = '%s'
LND_MAX_MESSAGE = '%s'
LOGIN_REQUIRED = %s

# Application definition

INSTALLED_APPS = [
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'django.contrib.admin',
    'django.contrib.humanize',
    'gui',
    'rest_framework',
    'django_filters',
]

MIDDLEWARE = [
    'django.middleware.security.SecurityMiddleware',%s
    '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 = 'lndg.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 = 'lndg.wsgi.application'


# Database
# https://docs.djangoproject.com/en/{{ docs_version }}/ref/settings/#databases

DATABASES = {
    'default': {
        'ENGINE': 'django.db.backends.sqlite3',
        'NAME': BASE_DIR / 'data/db.sqlite3',
        'OPTIONS': {
            'timeout': 20,
        },
    }
}


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

REST_FRAMEWORK = {
    'DEFAULT_PAGINATION_CLASS': 'rest_framework.pagination.LimitOffsetPagination',
    'PAGE_SIZE': 100,%s
    'DEFAULT_AUTHENTICATION_CLASSES': [
        'rest_framework.authentication.BasicAuthentication',
        'rest_framework.authentication.SessionAuthentication',
    ],
    'DEFAULT_FILTER_BACKENDS': ['django_filters.rest_framework.DjangoFilterBackend'],
}

# Internationalization
# https://docs.djangoproject.com/en/{{ docs_version }}/topics/i18n/

LANGUAGE_CODE = 'en-us'

TIME_ZONE = 'UTC'

USE_I18N = True

USE_TZ = False


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

STATIC_URL = 'static/'
STATIC_ROOT = os.path.join(BASE_DIR, 'gui/static/')
DEFAULT_AUTO_FIELD = 'django.db.models.BigAutoField'
SESSION_COOKIE_AGE = %s

LOGGING = {
    'version': 1,
    'disable_existing_loggers': False,
    'formatters': {
        'verbose': {
            'format': '{asctime} {name} {levelname} - {message}',
            'style': '{',
        },
        'simple': {
            'format': '{asctime} {name} - {message}',
            'style': '{',
        },
    },
    'handlers': {
        'app-file': {
            'level': 'INFO',
            'class': 'concurrent_log_handler.ConcurrentRotatingFileHandler',
            'filename': os.path.join(BASE_DIR, 'data/lndg-controller.log'),
            'maxBytes': 25*(1024*1024),
            'backupCount': 5,
            'formatter': 'verbose',
        },
        'web-file': {
            'level': 'INFO',
            'class': 'logging.handlers.RotatingFileHandler',
            'filename': os.path.join(BASE_DIR, 'data/lndg-web.log'),
            'maxBytes': 25*(1024*1024),
            'backupCount': 5,
            'formatter': 'verbose',
        },
        'console': {
            'level': 'INFO',
            'class': 'logging.StreamHandler',
            'formatter': 'simple',
        },
    },
    'loggers': {
        '[Controller]': {
            'handlers': ['app-file', 'console'],
            'level': 'INFO',
            'propagate': False,
        },
        '[Data]': {
            'handlers': ['app-file', 'console'],
            'level': 'INFO',
            'propagate': False,
        },
        '[Rebalancer]': {
            'handlers': ['app-file', 'console'],
            'level': 'INFO',
            'propagate': False,
        },
        '[HTLC]': {
            'handlers': ['app-file', 'console'],
            'level': 'INFO',
            'propagate': False,
        },
        '[P2P]': {
            'handlers': ['app-file', 'console'],
            'level': 'INFO',
            'propagate': False,
        },
        'django': {
            'handlers': ['web-file', 'console'],
            'level': 'INFO',
            'propagate': False,
        },
    },
}
''' % (secret, debug, node_ip, csrf, lnd_tls_path, lnd_macaroon_path, lnd_database_path, lnd_network, lnd_rpc_server, lnd_max_message, not nologinrequired, wnl, api_login, cookie_age)
    if not force_new and Path("lndg/settings.py").exists():
        print('A settings file already exist, skipping creation...')
        return
    try:
        with open("lndg/settings.py", "w") as f:
            f.write(settings_file)
    except Exception as e:
        print('Error creating the settings file: ', str(e))

def write_supervisord_settings(sduser):
    supervisord_secret = secrets.token_urlsafe(16)
    supervisord_settings_file = '''[supervisord]
user=%s
childlogdir = /var/log
logfile = /var/log/supervisord.log
logfile_maxbytes = 50MB
logfile_backups = 30
loglevel = info
pidfile = /var/supervisord.pid
umask = 022
nodaemon = false
nocleanup = false

[inet_http_server]
port = 9001
username = lndg-supervisord
password = %s

[supervisorctl]
serverurl = http://localhost:9001
username = lndg-supervisord
password = %s

[rpcinterface:supervisor]
supervisor.rpcinterface_factory=supervisor.rpcinterface:make_main_rpcinterface

[program:controller]
command = sh -c "python controller.py && sleep 15"
process_name = lndg-controller
directory = %s
autorestart = true
redirect_stderr = true
stdout_logfile = /var/log/lndg-controller.log
stdout_logfile_maxbytes = 150MB
stdout_logfile_backups = 15
''' % (sduser, supervisord_secret, supervisord_secret, BASE_DIR)
    if Path("/usr/local/supervisord.conf").exists():
        print('A supervisord settings file already exist, skipping creation...')
        return
    try:
        with open("/usr/local/supervisord.conf", "w") as f:
            f.write(supervisord_settings_file)
    except Exception as e:
        print('Error creating the settings file: ', str(e))

def initialize_django(adminuser, adminpw):
    try:
        DATA_DIR = os.path.join(BASE_DIR, 'data')
        try:
            os.mkdir(DATA_DIR)
        except:
            print('Data directory already found...')
        Path(os.path.join(DATA_DIR, 'db.sqlite3')).touch()
        settings.configure(
            SECRET_KEY = secrets.token_urlsafe(64),
            DATABASES = {
                'default':{
                    'ENGINE':'django.db.backends.sqlite3',
                    'NAME': BASE_DIR / 'data/db.sqlite3'
                }
            },
            INSTALLED_APPS = [
                'django.contrib.auth',
                'django.contrib.contenttypes',
                'django.contrib.sessions',
                'django.contrib.messages',
                'django.contrib.staticfiles',
                'django.contrib.admin',
                'rest_framework',
                'gui',
            ],
            STATIC_URL = 'static/', 
            STATIC_ROOT = os.path.join(BASE_DIR, 'gui/static/')
        )
        django.setup()
        call_command('migrate', verbosity=0)
        call_command('collectstatic', verbosity=0, interactive=False)
        if get_user_model().objects.count() == 0:
            print('Setting up initial user...')
            try:
                call_command('createsuperuser', username=adminuser, email='admin@lndg.local', interactive=False)
                admin = get_user_model().objects.get(username=adminuser)
                login_pw = secrets.token_urlsafe(16) if adminpw is None else adminpw
                admin.set_password(login_pw)
                admin.save()
                if adminpw is None:
                    try:
                        Path(os.path.join(DATA_DIR, 'lndg-admin.txt')).touch(mode=0o600)
                        Path(os.path.join(DATA_DIR, 'lndg-admin.txt')).chmod(0o600)
                        f = open('data/lndg-admin.txt', 'w')
                        f.write(login_pw)
                        f.close()
                    except Exception as e:
                        print('Error writing password file:', str(e))
                    print('FIRST TIME LOGIN PASSWORD:' + login_pw)
            except Exception as e:
                print('Error setting up initial user:', str(e))
    except Exception as e:
        print('Error initializing django:', str(e))

def main():
    help_msg = "LNDg Initializer"
    parser = argparse.ArgumentParser(description = help_msg)
    parser.add_argument('-ip', '--nodeip',help = 'IP that will be used to access the LNDg page', default='*')
    parser.add_argument('-dir', '--lnddir',help = 'LND Directory for tls cert and admin macaroon paths', default=None)
    parser.add_argument('-net', '--network', help = 'Network LND will run over', default='mainnet')
    parser.add_argument('-rpc', '--rpcserver', help = 'Server address to use for rpc communications with LND', default='localhost:10009')
    parser.add_argument('-maxmsg', '--maxmessage', help = 'Maximum message size for grpc communications (MB)', default='35')
    parser.add_argument('-sd', '--supervisord', help = 'Setup supervisord to run jobs/rebalancer background processes', action='store_true')
    parser.add_argument('-sdu', '--sduser', help = 'Configure supervisord with a non-root user', default='root')
    parser.add_argument('-wn', '--whitenoise', help = 'Add whitenoise middleware (docker requirement for static files)', action='store_true')
    parser.add_argument('-d', '--docker', help = 'Single option for docker container setup (supervisord + whitenoise)', action='store_true')
    parser.add_argument('-dx', '--debug', help = 'Setup the django site in debug mode', action='store_true')
    parser.add_argument('-u', '--adminuser', help = 'Setup a custom admin username', default='lndg-admin')
    parser.add_argument('-pw', '--adminpw', help = 'Setup a custom admin password', default=None)
    parser.add_argument('-csrf', '--csrftrusted', help = 'Set trusted CSRF origins', default=None)
    parser.add_argument('-tls', '--tlscert', help = 'Set the path to a custom tls cert', default=None)
    parser.add_argument('-mcrn', '--macaroon', help = 'Set the path to a custom macroon file', default=None)
    parser.add_argument('-lnddb', '--lnddatabase', help = 'Set the path to the channel.db for monitoring', default=None)
    parser.add_argument('-nologin', '--nologinrequired', help = 'By default, force all connections to be authenticated', action='store_true')
    parser.add_argument('-sessionage', '--sessioncookieage', help = 'Number of seconds before the login session expires', default='1209600')
    parser.add_argument('-f', '--force', help = 'Force a new settings file to be created', action='store_true')
    args = parser.parse_args()
    node_ip = args.nodeip
    lnd_dir_path = args.lnddir if args.lnddir else '~/.lnd'
    lnd_network = args.network
    lnd_rpc_server = args.rpcserver
    lnd_max_message = args.maxmessage
    setup_supervisord = args.supervisord
    sduser = args.sduser
    whitenoise = args.whitenoise
    docker = args.docker
    debug = args.debug
    adminuser = args.adminuser
    adminpw = args.adminpw
    csrftrusted = args.csrftrusted
    nologinrequired = args.nologinrequired
    force_new = args.force
    lnd_tls_path = args.tlscert if args.tlscert else lnd_dir_path + '/tls.cert'
    lnd_macaroon_path = args.macaroon if args.macaroon else lnd_dir_path + '/data/chain/bitcoin/' + lnd_network + '/admin.macaroon'
    lnd_database_path = args.lnddatabase if args.lnddatabase else lnd_dir_path + '/data/graph/' + lnd_network + '/channel.db'
    cookie_age = int(args.sessioncookieage)
    if docker:
        whitenoise = True
    write_settings(node_ip, lnd_tls_path, lnd_macaroon_path, lnd_database_path, lnd_network, lnd_rpc_server, lnd_max_message, whitenoise, debug, csrftrusted, nologinrequired, force_new, cookie_age)
    if setup_supervisord:
        print('Supervisord setup requested...')
        write_supervisord_settings(sduser)
    initialize_django(adminuser, adminpw)

if __name__ == '__main__':
    main()