#!/usr/bin/python

# (c) 2012, Mark Theunissen <mark.theunissen@gmail.com>
# Sponsored by Four Kitchens http://fourkitchens.com.
#
# This file is part of Ansible
#
# Ansible is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Ansible is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Ansible.  If not, see <http://www.gnu.org/licenses/>.

import ConfigParser
try:
    import MySQLdb
except ImportError:
    mysqldb_found = False
else:
    mysqldb_found = True

# ===========================================
# MySQL module specific support methods.
#

def db_exists(cursor, db):
    res = cursor.execute("SHOW DATABASES LIKE %s", (db,))
    return bool(res)

def db_delete(cursor, db):
    query = "DROP DATABASE %s" % db
    cursor.execute(query)
    return True

def db_create(cursor, db):
    query = "CREATE DATABASE %s" % db
    res = cursor.execute(query)
    return True

def load_mycnf():
    config = ConfigParser.RawConfigParser()
    mycnf = os.path.expanduser('~/.my.cnf')
    try:
        config.readfp(open(mycnf))
        creds = dict(user=config.get('client', 'user'),passwd=config.get('client', 'pass'))
    except (ConfigParser.NoOptionError, IOError):
        return False
    return creds

# ===========================================
# Module execution.
#

def main():
    module = AnsibleModule(
        argument_spec = dict(
            loginuser=dict(default=None),
            loginpasswd=dict(default=None),
            loginhost=dict(default="localhost"),
            db=dict(required=True),
            state=dict(default="present", choices=["absent", "present"]),
        )
    )

    if not mysqldb_found:
        module.fail_json(msg="the python mysqldb module is required")

    db = module.params["db"]
    state = module.params["state"]

    # Either the caller passes both a username and password with which to connect to
    # mysql, or they pass neither and allow this module to read the credentials from
    # ~/.my.cnf.
    loginpass = module.params["loginpass"]
    loginuser = module.params["loginuser"]
    if loginuser is None and loginpass is None:
        mycnf_creds = load_mycnf()
        if mycnf_creds is False:
            module.fail_json(msg="incomplete login arguments passed and can't find them in ~/.my.cnf")
        else:
            loginuser = mycnf_creds["user"]
            loginpass = mycnf_creds["passwd"]
    elif loginpass is None or loginuser is None:
        module.fail_json(msg="when supplying login arguments, both user and pass must be provided")

    try:
        db_connection = MySQLdb.connect(host=module.params["loginhost"], user=loginuser, passwd=loginpass, db="mysql")
        cursor = db_connection.cursor()
    except Exception as e:
        module.fail_json(msg="unable to connect to database")

    changed = False
    if db_exists(cursor, db):
        if state == "absent":
            changed = db_delete(cursor, db)
    else:
        if state == "present":
            changed = db_create(cursor, db)

    module.exit_json(changed=changed, db=db)

# this is magic, see lib/ansible/module_common.py
#<<INCLUDE_ANSIBLE_MODULE_COMMON>>
main()