import os
import textwrap
from optparse import make_option

from django.core.management.base import BaseCommand

from orchestra.utils.paths import get_project_dir
from orchestra.utils.sys import run, check_root


class Command(BaseCommand):
    def __init__(self, *args, **kwargs):
        super(Command, self).__init__(*args, **kwargs)
        self.option_list = BaseCommand.option_list + (
            make_option('--db_name', dest='db_name', default='orchestra',
                help='Specifies the database to create.'),
            make_option('--db_user', dest='db_user', default='orchestra',
                help='Specifies the database to create.'),
            make_option('--db_password', dest='db_password', default='orchestra',
                help='Specifies the database to create.'),
            make_option('--db_host', dest='db_host', default='localhost',
                help='Specifies the database to create.'),
            make_option('--db_port', dest='db_port', default='5432',
                help='Specifies the database to create.'),
            make_option('--noinput', action='store_false', dest='interactive', default=True,
                help='Tells Django to NOT prompt the user for input of any kind. '
                     'You must use --username with --noinput, and must contain the '
                     'cleeryd process owner, which is the user how will perform tincd updates'),
            )
    
    option_list = BaseCommand.option_list
    help = 'Setup PostgreSQL database.'
    
    @check_root
    def handle(self, *args, **options):
        # Configure firmware generation
        context = {
            'db_name': options.get('db_name'),
            'db_user': options.get('db_user'),
            'db_password': options.get('db_password'),
            'db_host': options.get('db_host'),
            'db_port': options.get('db_port'),
        }
        
        run(textwrap.dedent("""\
            su postgres -c "psql -c \\"CREATE USER %(db_user)s PASSWORD '%(db_password)s';\\"" || {
                su postgres -c "psql -c \\"ALTER USER %(db_user)s WITH PASSWORD '%(db_password)s';\\""
            }
            su postgres -c "psql -c \\"CREATE DATABASE %(db_name)s OWNER %(db_user)s;\\""\
            """) % context, valid_codes=(0,1)
        )
        context.update({
            'settings': os.path.join(get_project_dir(), 'settings.py')
        })
        
        if run("grep '^DATABASES\s*=\s*{' %(settings)s" % context, valid_codes=(0,1)).exit_code == 0:
            # Update existing settings_file
            run(textwrap.dedent("""\
                sed -i "s/'ENGINE':[^#]*/'ENGINE': 'django.db.backends.postgresql_psycopg2',/" %(settings)s
                sed -i "s/'NAME':[^#]*/'NAME': '%(db_name)s',/" %(settings)s
                sed -i "s/'USER':[^#]*/'USER': '%(db_user)s',/" %(settings)s
                sed -i "s/'PASSWORD':[^#]*/'PASSWORD': '%(db_password)s',/" %(settings)s
                sed -i "s/'HOST':[^#]*/'HOST': '%(db_host)s',/" %(settings)s
                sed -i "s/'PORT':[^#]*/'PORT': '%(db_port)s',/" %(settings)s\
                """) % context
            )
        else:
            db_config = textwrap.dedent("""\
                DATABASES = {
                    'default': {
                        'ENGINE': 'django.db.backends.postgresql_psycopg2',
                        'NAME': '%(db_name)s',
                        'USER': '%(db_user)s',
                        'PASSWORD': '%(db_password)s',
                        'HOST': '%(db_host)s',
                        'PORT': '%(db_port)s',
                        'ATOMIC_REQUESTS': True,
                    }
                }""") % context
            context.update({'db_config': db_config})
            run('echo "%(db_config)s" >> %(settings)s' % context)