# -*- coding: utf-8 -*-
# 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/>.
"""
kallithea.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) 2013 RhodeCode GmbH.
:license: GPLv3, see LICENSE.md for more details.
"""

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

from kallithea import __dbversion__, __py_version__

from kallithea.model.user import UserModel
from kallithea.lib.utils import ask_ok
from kallithea.model import init_model
from kallithea.model.db import User, Permission, Ui, \
    Setting, UserToPerm, DbMigrateVersion, RepoGroup, \
    UserRepoGroupToPerm, CacheInvalidation, UserGroup, Repository

from sqlalchemy.engine import create_engine
from kallithea.model.repo_group import RepoGroupModel
#from kallithea.model import meta
from kallithea.model.meta import Session, Base
from kallithea.model.repo import RepoModel
from kallithea.model.permission import PermissionModel
from kallithea.model.user_group import UserGroupModel


log = logging.getLogger(__name__)


def notify(msg):
    """
    Notification for migrations messages
    """
    ml = len(msg) + (4 * 2)
    print('\n%s\n*** %s ***\n%s' % ('*' * ml, msg, '*' * ml)).upper()


class DbManage(object):
    def __init__(self, log_sql, dbconf, root, tests=False, SESSION=None, cli_args={}):
        self.dbname = dbconf.split('/')[-1]
        self.tests = tests
        self.root = root
        self.dburi = dbconf
        self.log_sql = log_sql
        self.db_exists = False
        self.cli_args = cli_args
        self.init_db(SESSION=SESSION)

        force_ask = self.cli_args.get('force_ask')
        if force_ask is not None:
            global ask_ok
            ask_ok = lambda *args, **kwargs: force_ask

    def init_db(self, SESSION=None):
        if SESSION:
            self.sa = SESSION
        else:
            #init new sessions
            engine = create_engine(self.dburi, echo=self.log_sql)
            init_model(engine)
            self.sa = 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:
            print 'Nothing done.'
            sys.exit(0)
        if destroy:
            Base.metadata.drop_all()

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

    def set_db_version(self):
        ver = DbMigrateVersion()
        ver.version = __dbversion__
        ver.repository_id = 'rhodecode_db_migrations'
        ver.repository_path = 'versions'
        self.sa.add(ver)
        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 kallithea.lib.dbmigrate.migrate.versioning import api
        from kallithea.lib.dbmigrate.migrate.exceptions import \
            DatabaseNotControlledError

        if 'sqlite' in self.dburi:
            print (
               '********************** WARNING **********************\n'
               'Make sure your version of sqlite is at least 3.7.X.  \n'
               'Earlier versions are known to fail on some migrations\n'
               '*****************************************************\n')

        upgrade = ask_ok('You are about to perform database upgrade, make '
                         'sure You backed up your database before. '
                         'Continue ? [y/n]')
        if not upgrade:
            print 'No upgrade performed'
            sys.exit(0)

        repository_path = jn(dn(dn(dn(os.path.realpath(__file__)))),
                             'kallithea/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)

        notify(msg)
        if curr_version == __dbversion__:
            print 'This database is already at the newest version'
            sys.exit(0)

        # clear cache keys
        log.info("Clearing cache keys now...")
        CacheInvalidation.clear_cache()

        upgrade_steps = range(curr_version + 1, __dbversion__ + 1)
        notify('attempting to do database upgrade from '
               'version %s to version %s' % (curr_version, __dbversion__))

        # CALL THE PROPER ORDER OF STEPS TO PERFORM FULL UPGRADE
        _step = None
        for step in upgrade_steps:
            notify('performing upgrade step %s' % step)
            time.sleep(0.5)

            api.upgrade(db_uri, repository_path, step)
            notify('schema upgrade for step %s completed' % (step,))

            _step = step

        notify('upgrade to version %s successful' % _step)

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

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

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

        try:
            self.sa.add(paths)
            self.sa.commit()
        except Exception:
            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 == User.DEFAULT_USER)\
                .one()

        def_user.name = 'Anonymous'
        def_user.lastname = 'User'
        def_user.email = 'anonymous@kallithea-scm.org'

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

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

        hgsettings3 = Setting('ga_code', '')

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

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

            # defaults
            defaults = self.cli_args
            username = defaults.get('username')
            password = defaults.get('password')
            email = defaults.get('email')

            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
            if username is None:
                username = raw_input('Specify admin username:')
            if password is None:
                password = get_password()
                if not password:
                    #second try
                    password = get_password()
                    if not password:
                        sys.exit()
            if email is None:
                email = raw_input('Specify admin email:')
            self.create_user(username, password, email, True)
        else:
            log.info('creating admin and regular test users')
            from kallithea.tests import TEST_USER_ADMIN_LOGIN, \
            TEST_USER_ADMIN_PASS, TEST_USER_ADMIN_EMAIL, \
            TEST_USER_REGULAR_LOGIN, TEST_USER_REGULAR_PASS, \
            TEST_USER_REGULAR_EMAIL, TEST_USER_REGULAR2_LOGIN, \
            TEST_USER_REGULAR2_PASS, TEST_USER_REGULAR2_EMAIL

            self.create_user(TEST_USER_ADMIN_LOGIN, TEST_USER_ADMIN_PASS,
                             TEST_USER_ADMIN_EMAIL, True)

            self.create_user(TEST_USER_REGULAR_LOGIN, TEST_USER_REGULAR_PASS,
                             TEST_USER_REGULAR_EMAIL, False)

            self.create_user(TEST_USER_REGULAR2_LOGIN, TEST_USER_REGULAR2_PASS,
                             TEST_USER_REGULAR2_EMAIL, False)

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

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

        hooks1 = Ui() 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
        self.sa.add(hooks1)

        hooks2_key = Ui.HOOK_REPO_SIZE
        hooks2_ = self.sa.query(Ui)\
            .filter(Ui.ui_key == hooks2_key).scalar()
        hooks2 = Ui() if hooks2_ is None else hooks2_
        hooks2.ui_section = 'hooks'
        hooks2.ui_key = hooks2_key
        hooks2.ui_value = 'python:kallithea.lib.hooks.repo_size'
        self.sa.add(hooks2)

        hooks3 = Ui()
        hooks3.ui_section = 'hooks'
        hooks3.ui_key = Ui.HOOK_PUSH
        hooks3.ui_value = 'python:kallithea.lib.hooks.log_push_action'
        self.sa.add(hooks3)

        hooks4 = Ui()
        hooks4.ui_section = 'hooks'
        hooks4.ui_key = Ui.HOOK_PRE_PUSH
        hooks4.ui_value = 'python:kallithea.lib.hooks.pre_push'
        self.sa.add(hooks4)

        hooks5 = Ui()
        hooks5.ui_section = 'hooks'
        hooks5.ui_key = Ui.HOOK_PULL
        hooks5.ui_value = 'python:kallithea.lib.hooks.log_pull_action'
        self.sa.add(hooks5)

        hooks6 = Ui()
        hooks6.ui_section = 'hooks'
        hooks6.ui_key = Ui.HOOK_PRE_PULL
        hooks6.ui_value = 'python:kallithea.lib.hooks.pre_pull'
        self.sa.add(hooks6)

        # enable largefiles
        largefiles = Ui()
        largefiles.ui_section = 'extensions'
        largefiles.ui_key = 'largefiles'
        largefiles.ui_value = ''
        self.sa.add(largefiles)

        # set default largefiles cache dir, defaults to
        # /repo location/.cache/largefiles
        largefiles = Ui()
        largefiles.ui_section = 'largefiles'
        largefiles.ui_key = 'usercache'
        largefiles.ui_value = os.path.join(repo_store_path, '.cache',
                                           'largefiles')
        self.sa.add(largefiles)

        # enable hgsubversion disabled by default
        hgsubversion = Ui()
        hgsubversion.ui_section = 'extensions'
        hgsubversion.ui_key = 'hgsubversion'
        hgsubversion.ui_value = ''
        hgsubversion.ui_active = False
        self.sa.add(hgsubversion)

        # enable hggit disabled by default
        hggit = Ui()
        hggit.ui_section = 'extensions'
        hggit.ui_key = 'hggit'
        hggit.ui_value = ''
        hggit.ui_active = False
        self.sa.add(hggit)

    def create_auth_plugin_options(self, skip_existing=False):
        """
        Create default auth plugin settings, and make it active

        :param skip_existing:
        """

        for k, v, t in [('auth_plugins', 'kallithea.lib.auth_modules.auth_rhodecode', 'list'),
                     ('auth_rhodecode_enabled', 'True', 'bool')]:
            if skip_existing and Setting.get_by_name(k) != None:
                log.debug('Skipping option %s' % k)
                continue
            setting = Setting(k, v, t)
            self.sa.add(setting)

    def create_default_options(self, skip_existing=False):
        """Creates default settings"""

        for k, v, t in [
            ('default_repo_enable_locking',  False, 'bool'),
            ('default_repo_enable_downloads', False, 'bool'),
            ('default_repo_enable_statistics', False, 'bool'),
            ('default_repo_private', False, 'bool'),
            ('default_repo_type', 'hg', 'unicode')]:

            if skip_existing and Setting.get_by_name(k) is not None:
                log.debug('Skipping option %s' % k)
                continue
            setting = Setting(k, v, t)
            self.sa.add(setting)

    def fixup_groups(self):
        def_usr = User.get_default_user()
        for g in RepoGroup.query().all():
            g.group_name = g.get_new_name(g.name)
            self.sa.add(g)
            # get default perm
            default = UserRepoGroupToPerm.query()\
                .filter(UserRepoGroupToPerm.group == g)\
                .filter(UserRepoGroupToPerm.user == def_usr)\
                .scalar()

            if default is None:
                log.debug('missing default permission for group %s adding' % g)
                perm_obj = RepoGroupModel()._create_default_perms(g)
                self.sa.add(perm_obj)

    def reset_permissions(self, username):
        """
        Resets permissions to default state, usefull when old systems had
        bad permissions, we must clean them up

        :param username:
        """
        default_user = User.get_by_username(username)
        if not default_user:
            return

        u2p = UserToPerm.query()\
            .filter(UserToPerm.user == default_user).all()
        fixed = False
        if len(u2p) != len(Permission.DEFAULT_USER_PERMISSIONS):
            for p in u2p:
                Session().delete(p)
            fixed = True
            self.populate_default_permissions()
        return fixed

    def update_repo_info(self):
        RepoModel.update_repoinfo()

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

        if _path is not None:
            path = _path
        elif not self.tests and not test_repo_path:
            path = raw_input(
                 'Enter a valid absolute path to store repositories. '
                 'All repositories in that path will be added automatically:'
            )
        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,))

        elif not os.path.isabs(path):
            path_ok = False
            log.error('Given path %s is not an absolute path' % (path,))

        # check if path is at least readable.
        if not os.access(path, os.R_OK):
            path_ok = False
            log.error('Given path %s is not readable' % (path,))

        # check write access, warn user about non writeable paths
        elif not os.access(path, os.W_OK) and path_ok:
            log.warn('No write permission to given path %s' % (path,))
            if not ask_ok('Given path %s is not writeable, do you want to '
                          'continue with read only mode ? [y/n]' % (path,)):
                log.error('Canceled by user')
                sys.exit(-1)

        if retries == 0:
            sys.exit('max retries reached')
        if not path_ok:
            retries -= 1
            return self.config_prompt(test_repo_path, retries)

        real_path = os.path.normpath(os.path.realpath(path))

        if real_path != os.path.normpath(path):
            if not ask_ok(('Path looks like a symlink, Rhodecode will store '
                           'given path as %s ? [y/n]') % (real_path,)):
                log.error('Canceled by user')
                sys.exit(-1)

        return real_path

    def create_settings(self, path):

        self.create_ui_settings(path)

        ui_config = [
            ('web', 'push_ssl', 'false'),
            ('web', 'allow_archive', 'gz zip bz2'),
            ('web', 'allow_push', '*'),
            ('web', 'baseurl', '/'),
            ('paths', '/', path),
            #('phases', 'publish', 'false')
        ]
        for section, key, value in ui_config:
            ui_conf = Ui()
            setattr(ui_conf, 'ui_section', section)
            setattr(ui_conf, 'ui_key', key)
            setattr(ui_conf, 'ui_value', value)
            self.sa.add(ui_conf)

        settings = [
            ('realm', 'RhodeCode', 'unicode'),
            ('title', '', 'unicode'),
            ('ga_code', '', 'unicode'),
            ('show_public_icon', True, 'bool'),
            ('show_private_icon', True, 'bool'),
            ('stylify_metatags', False, 'bool'),
            ('dashboard_items', 100, 'int'),
            ('admin_grid_items', 25, 'int'),
            ('show_version', True, 'bool'),
            ('use_gravatar', True, 'bool'),
            ('gravatar_url', User.DEFAULT_GRAVATAR_URL, 'unicode'),
            ('clone_uri_tmpl', Repository.DEFAULT_CLONE_URI, 'unicode'),
            ('update_url', Setting.DEFAULT_UPDATE_URL, 'unicode'),
        ]
        for key, val, type_ in settings:
            sett = Setting(key, val, type_)
            self.sa.add(sett)

        self.create_auth_plugin_options()
        self.create_default_options()

        log.info('created ui config')

    def create_user(self, username, password, email='', admin=False):
        log.info('creating user %s' % username)
        UserModel().create_or_update(username, password, email,
                                     firstname='RhodeCode', lastname='Admin',
                                     active=True, admin=admin,
                                     extern_type="rhodecode")

    def create_default_user(self):
        log.info('creating default user')
        # create default user for handling default permissions.
        user = UserModel().create_or_update(username=User.DEFAULT_USER,
                                            password=str(uuid.uuid1())[:20],
                                            email='anonymous@kallithea-scm.org',
                                            firstname='Anonymous',
                                            lastname='User')
        # based on configuration options activate/deactive this user which
        # controlls anonymous access
        if self.cli_args.get('public_access') is False:
            log.info('Public access disabled')
            user.active = False
            Session().add(user)
            Session().commit()

    def create_permissions(self):
        """
        Creates all permissions defined in the system
        """
        # module.(access|create|change|delete)_[name]
        # module.(none|read|write|admin)
        log.info('creating permissions')
        PermissionModel(self.sa).create_permissions()

    def populate_default_permissions(self):
        """
        Populate default permissions. It will create only the default
        permissions that are missing, and not alter already defined ones
        """
        log.info('creating default user permissions')
        PermissionModel(self.sa).create_default_permissions(user=User.DEFAULT_USER)

    @staticmethod
    def check_waitress():
        """
        Function executed at the end of setup
        """
        if not __py_version__ >= (2, 6):
            notify('Python2.5 detected, please switch '
                   'egg:waitress#main -> egg:Paste#http '
                   'in your .ini file')