#!/usr/bin/python

import os
import sys

# print 'Number of arguments:', len(sys.argv), 'arguments.'
# print 'Argument List:', str(sys.argv)

actions = ['help', 'drop_user', 'create_user', 'delete_user', 'delete_database', 'create_database', 'grant_all_privileges']
def usage():
    print('')
    print('USAGE: '+__file__+' ['+'|'.join(action for action in actions)+'] [parameters]')
    print('')
    print('    '+__file__+' create_user <user_name> <password>')
    print('    '+__file__+' delete_user <user_name>')
    print('    '+__file__+' create_database <database_name>')
    print('    '+__file__+' delete_database <database_name> --force')
    print('    '+__file__+' grant_all_privileges <database_name> <user_name>')
    print('')
    print('')
    print('NOTE: this tool is intended to be used as \'postgres\' system user')
    print('')
    print('')


def show_help_and_exit():
    usage()
    exit()

def on_result_and_exit(result):
    if result==0:
        exit(0)
    
    print('ERRROR')
    exit(error_code)

#######


if len(sys.argv)<=1:
    show_help_and_exit()
    
if sys.argv[1] not in actions:
    print('Unknown command %s'%sys.argv[1])
    show_help_and_exit()
    
if sys.argv[1]=='help':
    show_help_and_exit()


if sys.argv[1]=='create_user':
    if len(sys.argv)!=4:
        show_help_and_exit()
    user_name = sys.argv[2]
    user_pass = sys.argv[3]
    
    print('PG - CREATE USER')
    print('- name: '+user_name)
    print('- password: XXX')
    
    sql = '"CREATE USER %s WITH PASSWORD \'%s\';"' %(user_name, user_pass)
    result = os.system('echo %s|psql' % (sql))
    on_result_and_exit(result)


if sys.argv[1]=='delete_user':
    if len(sys.argv)!=3:
        show_help_and_exit()

    user_name = sys.argv[2]
    
    print('PG - DELETE USER')
    print('- name: '+user_name)
    
    sql = '"DROP ROLE %s;"' %(user_name)
    result = os.system('echo %s|psql' % (sql))
    on_result_and_exit(result)


if sys.argv[1]=='create_database':
    if len(sys.argv)!=3:
        show_help_and_exit()
    name = sys.argv[2]
    
    print('PG - CREATE DATABASE')
    print('- name: '+name)
    
    sql = '"CREATE DATABASE %s;"' %(name)
    result = os.system('echo %s|psql' % (sql))
    on_result_and_exit(result)

if sys.argv[1]=='delete_database':
    if len(sys.argv)!=4:
        show_help_and_exit()
    name = sys.argv[2]
    force = sys.argv[3]
    
    print('PG - DROP DATABASE')
    print('- name: '+name)
    
    if force!='--force':
        print('Add --force option in order to drop a database')
        on_result_and_exit(-1)
        
    sql = '"DROP DATABASE %s;"' %(name)
    result = os.system('echo %s|psql' % (sql))
    on_result_and_exit(result)


if sys.argv[1]=='grant_all_privileges':
    if len(sys.argv)!=4:
        show_help_and_exit()
    database_name = sys.argv[2]
    user_name = sys.argv[3]
    
    print('PG - GRANT ALL PRIVILEGES ON DATABASE')
    print('- database: '+database_name)
    print('- user: '+user_name)
    
    sql = '"GRANT ALL PRIVILEGES ON DATABASE %s to %s;"' % (database_name, user_name)
    result = os.system('echo %s|psql' % (sql))
    on_result_and_exit(result)