# -*- coding: utf-8 -*-
"""
    rhodecode.lib.db_manage
    ~~~~~~~~~~~~~~~~~~~~~~~

    Database creation, and setup module for RhodeCode. Used for creation
    of database as well as for migration operations

    :created_on: Apr 10, 2010
    :author: marcink
    :copyright: (C) 2009-2011 Marcin Kuzminski <marcin@python-works.com>
    :license: GPLv3, see COPYING for more details.
"""
# This program 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.
#
# This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.

import os
import sys
import uuid
import logging
from os.path import dirname as dn, join as jn

from rhodecode import __dbversion__
from rhodecode.model import meta

from rhodecode.lib.auth import get_crypt_password, generate_api_key
from rhodecode.lib.utils import ask_ok
from rhodecode.model import init_model
from rhodecode.model.db import User, Permission, RhodeCodeUi, \
    RhodeCodeSettings, UserToPerm, DbMigrateVersion

from sqlalchemy.engine import create_engine

log = logging.getLogger(__name__)


class DbManage(object):
    def __init__(self, log_sql, dbconf, root, tests=False):
        self.dbname = dbconf.split('/')[-1]
        self.tests = tests
        self.root = root
        self.dburi = dbconf
        self.log_sql = log_sql
        self.db_exists = False
        self.init_db()

    def init_db(self):
        engine = create_engine(self.dburi, echo=self.log_sql)
        init_model(engine)
        self.sa = meta.Session()

    def create_tables(self, override=False):
        """Create a auth database
        """

        log.info("Any existing database is going to be destroyed")
        if self.tests:
            destroy = True
        else:
            destroy = ask_ok('Are you sure to destroy old database ? [y/n]')
        if not destroy:
            sys.exit()
        if destroy:
            meta.Base.metadata.drop_all()

        checkfirst = not override
        meta.Base.metadata.create_all(checkfirst=checkfirst)
        log.info('Created tables for %s', self.dbname)

    def set_db_version(self):
        try:
            ver = DbMigrateVersion()
            ver.version = __dbversion__
            ver.repository_id = 'rhodecode_db_migrations'
            ver.repository_path = 'versions'
            self.sa.add(ver)
            self.sa.commit()
        except:
            self.sa.rollback()
            raise
        log.info('db version set to: %s', __dbversion__)

    def upgrade(self):
        """Upgrades given database schema to given revision following
        all needed steps, to perform the upgrade

        """

        from rhodecode.lib.dbmigrate.migrate.versioning import api
        from rhodecode.lib.dbmigrate.migrate.exceptions import \
            DatabaseNotControlledError

        upgrade = ask_ok('You are about to perform database upgrade, make '
                         'sure You backed up your database before. '
                         'Continue ? [y/n]')
        if not upgrade:
            sys.exit('Nothing done')

        repository_path = jn(dn(dn(dn(os.path.realpath(__file__)))),
                             'rhodecode/lib/dbmigrate')
        db_uri = self.dburi

        try:
            curr_version = api.db_version(db_uri, repository_path)
            msg = ('Found current database under version'
                 ' control with version %s' % curr_version)

        except (RuntimeError, DatabaseNotControlledError):
            curr_version = 1
            msg = ('Current database is not under version control. Setting'
                   ' as version %s' % curr_version)
            api.version_control(db_uri, repository_path, curr_version)

        print (msg)

        if curr_version == __dbversion__:
            sys.exit('This database is already at the newest version')

        #======================================================================
        # UPGRADE STEPS
        #======================================================================
        class UpgradeSteps(object):
            """Those steps follow schema versions so for example schema
            for example schema with seq 002 == step_2 and so on.
            """

            def __init__(self, klass):
                self.klass = klass

            def step_0(self):
                #step 0 is the schema upgrade, and than follow proper upgrades
                print ('attempting to do database upgrade to version %s' \
                                % __dbversion__)
                api.upgrade(db_uri, repository_path, __dbversion__)
                print ('Schema upgrade completed')

            def step_1(self):
                pass

            def step_2(self):
                print ('Patching repo paths for newer version of RhodeCode')
                self.klass.fix_repo_paths()

                print ('Patching default user of RhodeCode')
                self.klass.fix_default_user()

                log.info('Changing ui settings')
                self.klass.create_ui_settings()

            def step_3(self):
                print ('Adding additional settings into RhodeCode db')
                self.klass.fix_settings()
                print ('Adding ldap defaults')
                self.klass.create_ldap_options(skip_existing=True)
                
        upgrade_steps = [0] + range(curr_version + 1, __dbversion__ + 1)

        #CALL THE PROPER ORDER OF STEPS TO PERFORM FULL UPGRADE
        for step in upgrade_steps:
            print ('performing upgrade step %s' % step)
            callable = getattr(UpgradeSteps(self), 'step_%s' % step)()

    def fix_repo_paths(self):
        """Fixes a old rhodecode version path into new one without a '*'
        """

        paths = self.sa.query(RhodeCodeUi)\
                .filter(RhodeCodeUi.ui_key == '/')\
                .scalar()

        paths.ui_value = paths.ui_value.replace('*', '')

        try:
            self.sa.add(paths)
            self.sa.commit()
        except:
            self.sa.rollback()
            raise

    def fix_default_user(self):
        """Fixes a old default user with some 'nicer' default values,
        used mostly for anonymous access
        """
        def_user = self.sa.query(User)\
                .filter(User.username == 'default')\
                .one()

        def_user.name = 'Anonymous'
        def_user.lastname = 'User'
        def_user.email = 'anonymous@rhodecode.org'

        try:
            self.sa.add(def_user)
            self.sa.commit()
        except:
            self.sa.rollback()
            raise

    def fix_settings(self):
        """Fixes rhodecode settings adds ga_code key for google analytics
        """

        hgsettings3 = RhodeCodeSettings('ga_code', '')

        try:
            self.sa.add(hgsettings3)
            self.sa.commit()
        except:
            self.sa.rollback()
            raise

    def admin_prompt(self, second=False):
        if not self.tests:
            import getpass

            def get_password():
                password = getpass.getpass('Specify admin password '
                                           '(min 6 chars):')
                confirm = getpass.getpass('Confirm password:')

                if password != confirm:
                    log.error('passwords mismatch')
                    return False
                if len(password) < 6:
                    log.error('password is to short use at least 6 characters')
                    return False

                return password

            username = raw_input('Specify admin username:')

            password = get_password()
            if not password:
                #second try
                password = get_password()
                if not password:
                    sys.exit()

            email = raw_input('Specify admin email:')
            self.create_user(username, password, email, True)
        else:
            log.info('creating admin and regular test users')
            self.create_user('test_admin', 'test12',
                             'test_admin@mail.com', True)
            self.create_user('test_regular', 'test12',
                             'test_regular@mail.com', False)
            self.create_user('test_regular2', 'test12',
                             'test_regular2@mail.com', False)

    def create_ui_settings(self):
        """Creates ui settings, fills out hooks
        and disables dotencode

        """
        #HOOKS
        hooks1_key = RhodeCodeUi.HOOK_UPDATE
        hooks1_ = self.sa.query(RhodeCodeUi)\
            .filter(RhodeCodeUi.ui_key == hooks1_key).scalar()

        hooks1 = RhodeCodeUi() if hooks1_ is None else hooks1_
        hooks1.ui_section = 'hooks'
        hooks1.ui_key = hooks1_key
        hooks1.ui_value = 'hg update >&2'
        hooks1.ui_active = False

        hooks2_key = RhodeCodeUi.HOOK_REPO_SIZE
        hooks2_ = self.sa.query(RhodeCodeUi)\
            .filter(RhodeCodeUi.ui_key == hooks2_key).scalar()

        hooks2 = RhodeCodeUi() if hooks2_ is None else hooks2_
        hooks2.ui_section = 'hooks'
        hooks2.ui_key = hooks2_key
        hooks2.ui_value = 'python:rhodecode.lib.hooks.repo_size'

        hooks3 = RhodeCodeUi()
        hooks3.ui_section = 'hooks'
        hooks3.ui_key = RhodeCodeUi.HOOK_PUSH
        hooks3.ui_value = 'python:rhodecode.lib.hooks.log_push_action'

        hooks4 = RhodeCodeUi()
        hooks4.ui_section = 'hooks'
        hooks4.ui_key = RhodeCodeUi.HOOK_PULL
        hooks4.ui_value = 'python:rhodecode.lib.hooks.log_pull_action'

        #For mercurial 1.7 set backward comapatibility with format
        dotencode_disable = RhodeCodeUi()
        dotencode_disable.ui_section = 'format'
        dotencode_disable.ui_key = 'dotencode'
        dotencode_disable.ui_value = 'false'

        try:
            self.sa.add(hooks1)
            self.sa.add(hooks2)
            self.sa.add(hooks3)
            self.sa.add(hooks4)
            self.sa.add(dotencode_disable)
            self.sa.commit()
        except:
            self.sa.rollback()
            raise

    def create_ldap_options(self,skip_existing=False):
        """Creates ldap settings"""

        try:
            for k, v in [('ldap_active', 'false'), ('ldap_host', ''),
                        ('ldap_port', '389'), ('ldap_tls_kind', 'PLAIN'),
                        ('ldap_tls_reqcert', ''), ('ldap_dn_user', ''),
                        ('ldap_dn_pass', ''), ('ldap_base_dn', ''),
                        ('ldap_filter', ''), ('ldap_search_scope', ''),
                        ('ldap_attr_login', ''), ('ldap_attr_firstname', ''),
                        ('ldap_attr_lastname', ''), ('ldap_attr_email', '')]:

                if skip_existing and RhodeCodeSettings.get_by_name(k) != None:
                    log.debug('Skipping option %s' % k)
                    continue
                setting = RhodeCodeSettings(k, v)
                self.sa.add(setting)
            self.sa.commit()
        except:
            self.sa.rollback()
            raise

    def config_prompt(self, test_repo_path='', retries=3):
        if retries == 3:
            log.info('Setting up repositories config')

        if not self.tests and not test_repo_path:
            path = raw_input('Specify valid full path to your repositories'
                        ' you can change this later in application settings:')
        else:
            path = test_repo_path
        path_ok = True

        #check proper dir
        if not os.path.isdir(path):
            path_ok = False
            log.error('Given path %s is not a valid directory', path)

        #check write access
        if not os.access(path, os.W_OK) and path_ok:
            path_ok = False
            log.error('No write permission to given path %s', path)


        if retries == 0:
            sys.exit('max retries reached')
        if path_ok is False:
            retries -= 1
            return self.config_prompt(test_repo_path, retries)

        return path

    def create_settings(self, path):

        self.create_ui_settings()

        #HG UI OPTIONS
        web1 = RhodeCodeUi()
        web1.ui_section = 'web'
        web1.ui_key = 'push_ssl'
        web1.ui_value = 'false'

        web2 = RhodeCodeUi()
        web2.ui_section = 'web'
        web2.ui_key = 'allow_archive'
        web2.ui_value = 'gz zip bz2'

        web3 = RhodeCodeUi()
        web3.ui_section = 'web'
        web3.ui_key = 'allow_push'
        web3.ui_value = '*'

        web4 = RhodeCodeUi()
        web4.ui_section = 'web'
        web4.ui_key = 'baseurl'
        web4.ui_value = '/'

        paths = RhodeCodeUi()
        paths.ui_section = 'paths'
        paths.ui_key = '/'
        paths.ui_value = path

        hgsettings1 = RhodeCodeSettings('realm', 'RhodeCode authentication')
        hgsettings2 = RhodeCodeSettings('title', 'RhodeCode')
        hgsettings3 = RhodeCodeSettings('ga_code', '')

        try:
            self.sa.add(web1)
            self.sa.add(web2)
            self.sa.add(web3)
            self.sa.add(web4)
            self.sa.add(paths)
            self.sa.add(hgsettings1)
            self.sa.add(hgsettings2)
            self.sa.add(hgsettings3)

            self.sa.commit()
        except:
            self.sa.rollback()
            raise

        self.create_ldap_options()

        log.info('created ui config')

    def create_user(self, username, password, email='', admin=False):
        log.info('creating administrator user %s', username)
        
        form_data = dict(username=username,
                         password=password,
                         active=True,
                         admin=admin,
                         name='RhodeCode',
                         lastname='Admin',
                         email=email)
        User.create(form_data)


    def create_default_user(self):
        log.info('creating default user')
        #create default user for handling default permissions.

        form_data = dict(username='default',
                         password=str(uuid.uuid1())[:8],
                         active=False,
                         admin=False,
                         name='Anonymous',
                         lastname='User',
                         email='anonymous@rhodecode.org')
        User.create(form_data)
        
    def create_permissions(self):
        #module.(access|create|change|delete)_[name]
        #module.(read|write|owner)
        perms = [('repository.none', 'Repository no access'),
                 ('repository.read', 'Repository read access'),
                 ('repository.write', 'Repository write access'),
                 ('repository.admin', 'Repository admin access'),
                 ('hg.admin', 'Hg Administrator'),
                 ('hg.create.repository', 'Repository create'),
                 ('hg.create.none', 'Repository creation disabled'),
                 ('hg.register.none', 'Register disabled'),
                 ('hg.register.manual_activate', 'Register new user with '
                                                 'RhodeCode without manual'
                                                 'activation'),

                 ('hg.register.auto_activate', 'Register new user with '
                                               'RhodeCode without auto '
                                               'activation'),
                ]

        for p in perms:
            new_perm = Permission()
            new_perm.permission_name = p[0]
            new_perm.permission_longname = p[1]
            try:
                self.sa.add(new_perm)
                self.sa.commit()
            except:
                self.sa.rollback()
                raise

    def populate_default_permissions(self):
        log.info('creating default user permissions')

        default_user = self.sa.query(User)\
        .filter(User.username == 'default').scalar()

        reg_perm = UserToPerm()
        reg_perm.user = default_user
        reg_perm.permission = self.sa.query(Permission)\
        .filter(Permission.permission_name == 'hg.register.manual_activate')\
        .scalar()

        create_repo_perm = UserToPerm()
        create_repo_perm.user = default_user
        create_repo_perm.permission = self.sa.query(Permission)\
        .filter(Permission.permission_name == 'hg.create.repository')\
        .scalar()

        default_repo_perm = UserToPerm()
        default_repo_perm.user = default_user
        default_repo_perm.permission = self.sa.query(Permission)\
        .filter(Permission.permission_name == 'repository.read')\
        .scalar()

        try:
            self.sa.add(reg_perm)
            self.sa.add(create_repo_perm)
            self.sa.add(default_repo_perm)
            self.sa.commit()
        except:
            self.sa.rollback()
            raise
