# -*- 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 Kallithea. Used for creation
of database as well as for migration operations

This file was forked by the Kallithea project in July 2014.
Original author and date, and relevant copyright and licensing information is below:
:created_on: Apr 10, 2010
:author: marcink
:copyright: (c) 2013 RhodeCode GmbH, and others.
:license: GPLv3, see LICENSE.md for more details.
"""

import os
import sys
import time
import uuid
import logging
from os.path import dirname

from kallithea import __dbversion__, __py_version__, EXTERN_TYPE_INTERNAL, DB_MIGRATIONS
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, 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


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=None):
        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 or {}
        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 = 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 = os.path.join(dirname(dirname(dirname(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 kallithea version path into new one without a '*'
        """

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

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

        self.sa.add(paths)
        self.sa.commit()

    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'

        self.sa.add(def_user)
        self.sa.commit()

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

        hgsettings3 = Setting('ga_code', '')

        self.sa.add(hgsettings3)
        self.sa.commit()

    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
        """

        #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_internal', 'list'),
                     ('auth_internal_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, useful 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.warning('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:
            if _path is not None:
                sys.exit('Invalid repo path: %s' % _path)
            retries -= 1
            return self.config_prompt(test_repo_path, retries) # recursing!!!

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

        if real_path != os.path.normpath(path):
            log.warning('Using normalized path %s instead of %s', real_path, path)

        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', 'Kallithea', '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=u'Kallithea', lastname=u'Admin',
                                     active=True, admin=admin,
                                     extern_type=EXTERN_TYPE_INTERNAL)

    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=u'Anonymous',
                                            lastname=u'User')
        # based on configuration options activate/deactivate this user which
        # controls 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')