# -*- coding: utf-8 -*-
#
# Copyright (C) 2005-2019 Edgewall Software
# All rights reserved.
#
# This software is licensed as described in the file COPYING, which
# you should have received as part of this distribution. The terms
# are also available at https://trac.edgewall.org/wiki/TracLicense.
#
# This software consists of voluntary contributions made by many
# individuals. For the exact contribution history, see the revision
# history and logs, available at https://trac.edgewall.org/.

from trac.admin.api import AdminCommandError, IAdminCommandProvider, \
                           IAdminPanelProvider, console_date_format, \
                           console_datetime_format, get_console_locale
from trac.core import *
from trac.resource import ResourceNotFound
from trac.ticket import model
from trac.ticket.api import TicketSystem
from trac.ticket.roadmap import MilestoneModule
from trac.util import as_int, getuser
from trac.util.datefmt import format_date, format_datetime, \
                              get_datetime_format_hint, parse_date, user_time
from trac.util.text import exception_to_unicode, print_table, printout
from trac.util.translation import _, N_, gettext
from trac.web.chrome import Chrome, add_notice, add_script, add_warning


class TicketAdminPanel(Component):

    implements(IAdminPanelProvider, IAdminCommandProvider)

    abstract = True

    _type = 'undefined'
    _label = N_("(Undefined)"), N_("(Undefined)")

    # i18n note: use gettext() whenever referring to the above as text labels,
    #            and don't use it whenever using them as field names (after
    #            a call to `.lower()`)

    # IAdminPanelProvider methods

    def get_admin_panels(self, req):
        if 'TICKET_ADMIN' in req.perm('admin', 'ticket/' + self._type):
            yield ('ticket', _('Ticket System'), self._type,
                   gettext(self._label[1]))

    def render_admin_panel(self, req, cat, page, path_info):
        # Trap AssertionErrors and convert them to TracErrors
        try:
            return self._render_admin_panel(req, cat, page, path_info)
        except AssertionError as e:
            raise TracError(e)

    def _save_config(self, req):
        """Try to save the config, and display either a success notice or a
        failure warning.
        """
        try:
            self.config.save()
        except EnvironmentError as e:
            self.log.error("Error writing to trac.ini: %s",
                           exception_to_unicode(e))
            add_warning(req, _("Error writing to trac.ini, make sure it is "
                               "writable by the web server. Your changes "
                               "have not been saved."))
        else:
            add_notice(req, _("Your changes have been saved."))

    def _render_admin_panel(self, req, cat, page, path_info):
        raise NotImplemented("Class inheriting from TicketAdminPanel has not "
                             "implemented the _render_admin_panel method.")


class ComponentAdminPanel(TicketAdminPanel):

    _type = 'components'
    _label = N_("Component"), N_("Components")

    # TicketAdminPanel methods

    def _render_admin_panel(self, req, cat, page, component):
        # Detail view?
        if component:
            comp = model.Component(self.env, component)
            if req.method == 'POST':
                if req.args.get('save'):
                    comp.name = req.args.get('name')
                    comp.owner = req.args.get('owner')
                    comp.description = req.args.get('description')
                    comp.update()
                    add_notice(req, _("Your changes have been saved."))
                    req.redirect(req.href.admin(cat, page))
                elif req.args.get('cancel'):
                    req.redirect(req.href.admin(cat, page))

            chrome = Chrome(self.env)
            chrome.add_wiki_toolbars(req)
            chrome.add_auto_preview(req)
            data = {'view': 'detail', 'component': comp}

        else:
            default = self.config.get('ticket', 'default_component')
            if req.method == 'POST':
                # Add Component
                if req.args.get('add') and req.args.get('name'):
                    comp = model.Component(self.env)
                    comp.name = req.args.get('name')
                    comp.owner = req.args.get('owner')
                    comp.insert()
                    add_notice(req, _('The component "%(name)s" has been '
                                      'added.', name=comp.name))

                # Remove components
                elif req.args.get('remove'):
                    sel = req.args.getlist('sel')
                    if not sel:
                        raise TracError(_("No component selected"))
                    with self.env.db_transaction:
                        for name in sel:
                            model.Component(self.env, name).delete()
                            if name == default:
                                self.config.set('ticket',
                                                'default_component', '')
                                self._save_config(req)
                    add_notice(req, _("The selected components have been "
                                      "removed."))

                # Set default component
                elif req.args.get('apply'):
                    name = req.args.get('default')
                    if name and name != default:
                        self.log.info("Setting default component to %s", name)
                        self.config.set('ticket', 'default_component', name)
                        self._save_config(req)

                # Clear default component
                elif req.args.get('clear'):
                    self.log.info("Clearing default component")
                    self.config.set('ticket', 'default_component', '')
                    self._save_config(req)

                req.redirect(req.href.admin(cat, page))

            data = {'view': 'list',
                    'components': list(model.Component.select(self.env)),
                    'default': default}

        owners = TicketSystem(self.env).get_allowed_owners()
        if owners is not None:
            owners.insert(0, '')
        data.update({'owners': owners})

        return 'admin_components.html', data

    # IAdminCommandProvider methods

    def get_admin_commands(self):
        yield ('component list', '',
               "Show components",
               None, self._do_list)
        yield ('component add', '<name> [owner]',
               "Add component",
               self._complete_add, self._do_add)
        yield ('component rename', '<name> <newname>',
               "Rename component",
               self._complete_name, self._do_rename)
        yield ('component remove', '<name>',
               "Remove component",
               self._complete_name, self._do_remove)
        yield ('component chown', '<name> <owner>',
               "Change component owner",
               self._complete_chown, self._do_chown)

    def get_component_list(self):
        return [c.name for c in model.Component.select(self.env)]

    def get_user_list(self):
        return TicketSystem(self.env).get_allowed_owners()

    def _complete_add(self, args):
        if len(args) == 2:
            return self.get_user_list()

    def _complete_name(self, args):
        if len(args) == 1:
            return self.get_component_list()

    def _complete_chown(self, args):
        if len(args) == 1:
            return self.get_component_list()
        elif len(args) == 2:
            return self.get_user_list()

    def _do_list(self):
        print_table([(c.name, c.owner)
                     for c in model.Component.select(self.env)],
                    [_("Name"), _("Owner")])

    def _do_add(self, name, owner=None):
        component = model.Component(self.env)
        component.name = name
        component.owner = owner
        component.insert()

    def _do_rename(self, name, newname):
        component = model.Component(self.env, name)
        component.name = newname
        component.update()

    def _do_remove(self, name):
        model.Component(self.env, name).delete()

    def _do_chown(self, name, owner):
        component = model.Component(self.env, name)
        component.owner = owner
        component.update()


class MilestoneAdminPanel(TicketAdminPanel):

    _type = 'milestones'
    _label = N_("Milestone"), N_("Milestones")

    # TicketAdminPanel methods

    def get_admin_panels(self, req):
        perm = req.perm('admin', 'ticket/' + self._type)
        if 'MILESTONE_ADMIN' in perm or \
                'MILESTONE_VIEW' in perm and 'TICKET_ADMIN' in perm:
            yield ('ticket', _('Ticket System'), self._type,
                   gettext(self._label[1]))

    def _render_admin_panel(self, req, cat, page, milestone_name):
        perm_cache = req.perm('admin', 'ticket/' + self._type)

        # Detail view
        if milestone_name:
            milestone = model.Milestone(self.env, milestone_name)
            milestone_module = MilestoneModule(self.env)
            if req.method == 'POST':
                if 'save' in req.args:
                    perm_cache.require('MILESTONE_MODIFY')
                    if milestone_module.save_milestone(req, milestone):
                        req.redirect(req.href.admin(cat, page))

                elif 'cancel' in req.args:
                    req.redirect(req.href.admin(cat, page))

            chrome = Chrome(self.env)
            chrome.add_wiki_toolbars(req)
            chrome.add_auto_preview(req)
            data = {'view': 'detail',
                    'milestone': milestone,
                    'default_due': milestone_module.get_default_due(req)}

        # List view
        else:
            ticket_default = self.config.get('ticket', 'default_milestone')
            retarget_default = self.config.get('milestone',
                                               'default_retarget_to')
            if req.method == 'POST':

                # Add milestone
                if 'add' in req.args and req.args.get('name'):
                    perm_cache.require('MILESTONE_CREATE')
                    name = req.args.get('name')
                    try:
                        model.Milestone(self.env, name=name)
                    except ResourceNotFound:
                        milestone = model.Milestone(self.env)
                        milestone.name = name
                        MilestoneModule(self.env).save_milestone(req,
                                                                 milestone)
                    else:
                        add_warning(req, _('Milestone "%(name)s" already '
                                           'exists, please choose another '
                                           'name.', name=name))

                # Remove milestone
                elif 'remove' in req.args:
                    save = False
                    perm_cache.require('MILESTONE_DELETE')
                    sel = req.args.getlist('sel')
                    if not sel:
                        raise TracError(_("No milestone selected"))
                    with self.env.db_transaction:
                        for name in sel:
                            milestone = model.Milestone(self.env, name)
                            milestone.move_tickets(None, req.authname,
                                                   "Milestone deleted")
                            milestone.delete()
                            if name == ticket_default:
                                self.config.set('ticket',
                                                'default_milestone', '')
                                save = True
                            if name == retarget_default:
                                self.config.set('milestone',
                                                'default_retarget_to', '')
                                save = True
                    if save:
                        self._save_config(req)
                    add_notice(req, _("The selected milestones have been "
                                      "removed."))

                # Set default ticket milestone and retarget milestone
                elif 'apply' in req.args:
                    save = False
                    perm_cache.require('TICKET_ADMIN')
                    name = req.args.get('ticket_default')
                    if name and name != ticket_default:
                        self.log.info("Setting default ticket "
                                      "milestone to %s", name)
                        self.config.set('ticket', 'default_milestone', name)
                        save = True
                    retarget = req.args.get('retarget_default')
                    if retarget and retarget != retarget_default:
                        self.log.info("Setting default retargeting "
                                      "milestone to %s", retarget)
                        self.config.set('milestone', 'default_retarget_to',
                                        retarget)
                        save = True
                    if save:
                        self._save_config(req)

                # Clear default ticket milestone and retarget milestone
                elif 'clear' in req.args:
                    perm_cache.require('TICKET_ADMIN')
                    self.log.info("Clearing default ticket milestone "
                                  "and default retarget milestone")
                    self.config.set('ticket', 'default_milestone', '')
                    self.config.set('milestone', 'default_retarget_to', '')
                    self._save_config(req)

                req.redirect(req.href.admin(cat, page))

            # Get ticket count
            num_tickets = dict(self.env.db_query("""
                    SELECT milestone, COUNT(milestone) FROM ticket
                    WHERE milestone != ''
                    GROUP BY milestone
                """))
            query_href = lambda name: req.href.query([('group', 'status'),
                                                      ('milestone', name)])

            data = {'view': 'list',
                    'milestones': model.Milestone.select(self.env),
                    'query_href': query_href,
                    'num_tickets': lambda m: num_tickets.get(m.name, 0),
                    'ticket_default': ticket_default,
                    'retarget_default': retarget_default}

        Chrome(self.env).add_jquery_ui(req)

        data.update({
            'datetime_hint': get_datetime_format_hint(req.lc_time),
        })
        return 'admin_milestones.html', data

    # IAdminCommandProvider methods

    def get_admin_commands(self):
        locale = get_console_locale(self.env)
        hints = {
            'datetime': get_datetime_format_hint(locale),
            'iso8601': get_datetime_format_hint('iso8601'),
        }
        yield ('milestone list', '',
               "Show milestones",
               None, self._do_list)
        yield ('milestone add', '<name> [due]',
               "Add milestone",
               None, self._do_add)
        yield ('milestone rename', '<name> <newname>',
               "Rename milestone",
               self._complete_name, self._do_rename)
        yield ('milestone due', '<name> <due>',
               """Set milestone due date

               The <due> date must be specified in the "%(datetime)s"
               or "%(iso8601)s" (ISO 8601) format.
               Alternatively, "now" can be used to set the due date to the
               current time. To remove the due date from a milestone, specify
               an empty string ("").
               """ % hints,
               self._complete_name, self._do_due)
        yield ('milestone completed', '<name> <completed>',
               """Set milestone complete date

               The <completed> date must be specified in the "%(datetime)s"
               or "%(iso8601)s" (ISO 8601) format.
               Alternatively, "now" can be used to set the completion date to
               the current time. To remove the completion date from a
               milestone, specify an empty string ("").
               """ % hints,
               self._complete_name, self._do_completed)
        yield ('milestone remove', '<name>',
               "Remove milestone",
               self._complete_name, self._do_remove)

    def get_milestone_list(self):
        return [m.name for m in model.Milestone.select(self.env)]

    def _complete_name(self, args):
        if len(args) == 1:
            return self.get_milestone_list()

    def _do_list(self):
        print_table([(m.name,
                      format_date(m.due, console_date_format)
                      if m.due else None,
                      format_datetime(m.completed, console_datetime_format)
                      if m.completed else None)
                     for m in model.Milestone.select(self.env)],
                    [_("Name"), _("Due"), _("Completed")])

    def _do_add(self, name, due=None):
        milestone = model.Milestone(self.env)
        milestone.name = name
        if due is not None:
            milestone.due = parse_date(due, hint='datetime',
                                       locale=get_console_locale(self.env))
        milestone.insert()

    def _do_rename(self, name, newname):
        milestone = model.Milestone(self.env, name)
        milestone.name = newname
        milestone.update(author=getuser())

    def _do_due(self, name, due):
        milestone = model.Milestone(self.env, name)
        milestone.due = parse_date(due, hint='datetime',
                                   locale=get_console_locale(self.env)) \
                        if due else None
        milestone.update()

    def _do_completed(self, name, completed):
        milestone = model.Milestone(self.env, name)
        milestone.completed = parse_date(completed, hint='datetime',
                                         locale=get_console_locale(self.env)) \
                              if completed else None
        milestone.update()

    def _do_remove(self, name):
        model.Milestone(self.env, name).delete()


class VersionAdminPanel(TicketAdminPanel):

    _type = 'versions'
    _label = N_("Version"), N_("Versions")

    # TicketAdminPanel methods

    def _render_admin_panel(self, req, cat, page, version):
        # Detail view?
        if version:
            ver = model.Version(self.env, version)
            if req.method == 'POST':
                if req.args.get('save'):
                    ver.name = req.args.get('name')
                    ver.time = self._get_user_time(req)
                    ver.description = req.args.get('description')
                    ver.update()
                    add_notice(req, _("Your changes have been saved."))
                    req.redirect(req.href.admin(cat, page))
                elif req.args.get('cancel'):
                    req.redirect(req.href.admin(cat, page))

            chrome = Chrome(self.env)
            chrome.add_wiki_toolbars(req)
            chrome.add_auto_preview(req)
            data = {'view': 'detail', 'version': ver}

        else:
            default = self.config.get('ticket', 'default_version')
            if req.method == 'POST':
                # Add Version
                if req.args.get('add') and req.args.get('name'):
                    ver = model.Version(self.env)
                    ver.name = req.args.get('name')
                    ver.time = self._get_user_time(req)
                    ver.insert()
                    add_notice(req, _('The version "%(name)s" has been '
                                      'added.', name=ver.name))

                # Remove versions
                elif req.args.get('remove'):
                    sel = req.args.getlist('sel')
                    if not sel:
                        raise TracError(_("No version selected"))
                    with self.env.db_transaction:
                        for name in sel:
                            model.Version(self.env, name).delete()
                            if name == default:
                                self.config.set('ticket',
                                                'default_version', '')
                                self._save_config(req)
                    add_notice(req, _("The selected versions have been "
                                      "removed."))

                # Set default version
                elif req.args.get('apply'):
                    name = req.args.get('default')
                    if name and name != default:
                        self.log.info("Setting default version to %s", name)
                        self.config.set('ticket', 'default_version', name)
                        self._save_config(req)

                # Clear default version
                elif req.args.get('clear'):
                    self.log.info("Clearing default version")
                    self.config.set('ticket', 'default_version', '')
                    self._save_config(req)

                req.redirect(req.href.admin(cat, page))

            data = {'view': 'list',
                    'versions': list(model.Version.select(self.env)),
                    'default': default}

        Chrome(self.env).add_jquery_ui(req)
        data.update({'datetime_hint': get_datetime_format_hint(req.lc_time)})

        return 'admin_versions.html', data

    @classmethod
    def _get_user_time(cls, req):
        time = req.args.get('time')
        return user_time(req, parse_date, time, hint='datetime') \
               if time else None

    # IAdminCommandProvider methods

    def get_admin_commands(self):
        locale = get_console_locale(self.env)
        hints = {
            'datetime': get_datetime_format_hint(locale),
            'iso8601': get_datetime_format_hint('iso8601'),
        }
        yield ('version list', '',
               "Show versions",
               None, self._do_list)
        yield ('version add', '<name> [time]',
               "Add version",
               None, self._do_add)
        yield ('version rename', '<name> <newname>',
               "Rename version",
               self._complete_name, self._do_rename)
        yield ('version remove', '<name>',
               "Remove version",
               self._complete_name, self._do_remove)
        yield ('version time', '<name> <time>',
               """Set version date

               The <time> must be specified in the "%(datetime)s"
               or "%(iso8601)s" (ISO 8601) format.
               Alternatively, "now" can be used to set the version date to
               the current time. To remove the date from a version, specify
               an empty string ("").
               """ % hints,
               self._complete_name, self._do_time)

    def get_version_list(self):
        return [v.name for v in model.Version.select(self.env)]

    def _complete_name(self, args):
        if len(args) == 1:
            return self.get_version_list()

    def _do_list(self):
        print_table([(v.name,
                      format_date(v.time, console_date_format)
                      if v.time else None)
                     for v in model.Version.select(self.env)],
                    [_("Name"), _("Time")])

    def _do_add(self, name, time=None):
        version = model.Version(self.env)
        version.name = name
        version.time = parse_date(time, hint='datetime',
                                  locale=get_console_locale(self.env)) \
                       if time else None
        version.insert()

    def _do_rename(self, name, newname):
        version = model.Version(self.env, name)
        version.name = newname
        version.update()

    def _do_remove(self, name):
        model.Version(self.env, name).delete()

    def _do_time(self, name, time):
        version = model.Version(self.env, name)
        version.time = parse_date(time, hint='datetime',
                                  locale=get_console_locale(self.env)) \
                       if time else None
        version.update()


class AbstractEnumAdminPanel(TicketAdminPanel):

    abstract = True

    _type = 'unknown'
    _enum_cls = None

    # TicketAdminPanel methods

    def _render_admin_panel(self, req, cat, page, path_info):
        label = [gettext(each) for each in self._label]
        data = {'label_singular': label[0], 'label_plural': label[1],
                'type': self._type}

        # Detail view?
        if path_info:
            enum = self._enum_cls(self.env, path_info)
            if req.method == 'POST':
                if req.args.get('save'):
                    enum.name = req.args.get('name')
                    enum.description = req.args.get('description')
                    enum.update()
                    add_notice(req, _("Your changes have been saved."))
                    req.redirect(req.href.admin(cat, page))
                elif req.args.get('cancel'):
                    req.redirect(req.href.admin(cat, page))
            chrome = Chrome(self.env)
            chrome.add_wiki_toolbars(req)
            chrome.add_auto_preview(req)
            data.update({'view': 'detail', 'enum': enum})

        else:
            default = self.config.get('ticket', 'default_%s' % self._type)
            if req.method == 'POST':
                # Add enum
                if req.args.get('add') and req.args.get('name'):
                    enum = self._enum_cls(self.env)
                    enum.name = req.args.get('name')
                    enum.insert()
                    add_notice(req, _('The %(field)s value "%(name)s" '
                                      'has been added.',
                                      field=label[0], name=enum.name))

                # Remove enums
                elif req.args.get('remove'):
                    sel = req.args.getlist('sel')
                    if not sel:
                        raise TracError(_("No %s selected") % self._type)
                    with self.env.db_transaction:
                        for name in sel:
                            self._enum_cls(self.env, name).delete()
                            if name == default:
                                self.config.set('ticket',
                                                'default_%s' % self._type, '')
                                self.config.save()
                    add_notice(req, _("The selected %(field)s values have "
                                      "been removed.", field=label[0]))

                # Apply changes
                elif req.args.get('apply'):
                    # Set default value
                    name = req.args.get('default')
                    if name and name != default:
                        self.log.info("Setting default %s to %s",
                                      self._type, name)
                        self.config.set('ticket', 'default_%s' % self._type,
                                        name)
                        self._save_config(req)

                    # Change enum values
                    order = {str(int(key[6:])): str(req.args.getint(key))
                             for key in req.args
                             if key.startswith('value_')}
                    values = {val: True for val in order.values()}
                    if len(order) != len(values):
                        raise TracError(_("Order numbers must be unique"))
                    changed = False
                    with self.env.db_transaction:
                        for enum in self._enum_cls.select(self.env):
                            new_value = order[enum.value]
                            if new_value != enum.value:
                                enum.value = new_value
                                enum.update()
                                changed = True

                    if changed:
                        add_notice(req, _("Your changes have been saved."))

                # Clear default
                elif req.args.get('clear'):
                    self.log.info("Clearing default %s", self._type)
                    self.config.set('ticket', 'default_%s' % self._type, '')
                    self._save_config(req)

                req.redirect(req.href.admin(cat, page))

            Chrome(self.env).add_jquery_ui(req)
            add_script(req, 'common/js/admin_enums.js')
            data.update(dict(enums=list(self._enum_cls.select(self.env)),
                             default=default, view='list'))

        return 'admin_enums.html', data

    # IAdminCommandProvider methods

    _command_help = {
        'list': "Show possible ticket %s",
        'add': "Add a %s value option",
        'change': "Change a %s value",
        'remove': "Remove a %s value",
        'order': "Move a %s value up or down in the list",
    }

    def get_admin_commands(self):
        enum_type = getattr(self, '_command_type', self._type)
        label = tuple(each.lower() for each in self._label)
        yield ('%s list' % enum_type, '',
               self._command_help['list'] % label[1],
               None, self._do_list)
        yield ('%s add' % enum_type, '<value>',
               self._command_help['add'] % label[0],
               None, self._do_add)
        yield ('%s change' % enum_type, '<value> <newvalue>',
               self._command_help['change'] % label[0],
               self._complete_change_remove, self._do_change)
        yield ('%s remove' % enum_type, '<value>',
               self._command_help['remove'] % label[0],
               self._complete_change_remove, self._do_remove)
        yield ('%s order' % enum_type, '<value> up|down',
               self._command_help['order'] % label[0],
               self._complete_order, self._do_order)

    def get_enum_list(self):
        return [e.name for e in self._enum_cls.select(self.env)]

    def _complete_change_remove(self, args):
        if len(args) == 1:
            return self.get_enum_list()

    def _complete_order(self, args):
        if len(args) == 1:
            return self.get_enum_list()
        elif len(args) == 2:
            return ['up', 'down']

    def _do_list(self):
        print_table([(e.name,) for e in self._enum_cls.select(self.env)],
                    [_("Possible Values")])

    def _do_add(self, name):
        enum = self._enum_cls(self.env)
        enum.name = name
        enum.insert()

    def _do_change(self, name, newname):
        enum = self._enum_cls(self.env, name)
        enum.name = newname
        enum.update()

    def _do_remove(self, value):
        self._enum_cls(self.env, value).delete()

    def _do_order(self, name, up_down):
        if up_down not in ('up', 'down'):
            raise AdminCommandError(_("Invalid up/down value: %(value)s",
                                      value=up_down))
        direction = -1 if up_down == 'up' else 1
        enum1 = self._enum_cls(self.env, name)
        enum1.value = int(float(enum1.value) + direction)
        for enum2 in self._enum_cls.select(self.env):
            if int(float(enum2.value)) == enum1.value:
                enum2.value = int(float(enum2.value) - direction)
                break
        else:
            return
        with self.env.db_transaction:
            enum1.update()
            enum2.update()


class PriorityAdminPanel(AbstractEnumAdminPanel):
    _type = 'priority'
    _enum_cls = model.Priority
    _label = model.Priority.label


class ResolutionAdminPanel(AbstractEnumAdminPanel):
    _type = 'resolution'
    _enum_cls = model.Resolution
    _label = model.Resolution.label


class SeverityAdminPanel(AbstractEnumAdminPanel):
    _type = 'severity'
    _enum_cls = model.Severity
    _label = model.Severity.label


class TicketTypeAdminPanel(AbstractEnumAdminPanel):
    _type = 'type'
    _enum_cls = model.Type
    _label = model.Type.label

    _command_type = 'ticket_type'
    _command_help = {
        'list': 'Show possible %s',
        'add': 'Add a %s',
        'change': 'Change a %s',
        'remove': 'Remove a %s',
        'order': 'Move a %s up or down in the list',
    }


class TicketAdmin(Component):
    """trac-admin command provider for ticket administration."""

    implements(IAdminCommandProvider)

    # IAdminCommandProvider methods

    def get_admin_commands(self):
        yield ('ticket remove', '<ticket#>',
               'Remove ticket', None, self._do_remove)
        yield ('ticket remove_comment', '<ticket#> <comment#>',
               'Remove ticket comment', None, self._do_remove_comment)

    def _do_remove(self, number):
        number = as_int(number, None)
        if number is None:
            raise AdminCommandError(_("<ticket#> must be a number"))
        with self.env.db_transaction:
            model.Ticket(self.env, number).delete()
        printout(_("Ticket #%(num)s and all associated data removed.",
                   num=number))

    def _do_remove_comment(self, ticket_number, comment_number):
        ticket_number = as_int(ticket_number, None)
        if ticket_number is None:
            raise AdminCommandError(_('<ticket#> must be a number'))
        comment_number = as_int(comment_number, None)
        if comment_number is None:
            raise AdminCommandError(_('<comment#> must be a number'))
        with self.env.db_transaction:
            ticket = model.Ticket(self.env, ticket_number)
            change = ticket.get_change(comment_number)
            if not change:
                raise AdminCommandError(_("Comment %(num)s not found",
                                          num=comment_number))
            ticket.delete_change(comment_number)
        printout(_("The ticket comment %(num)s on ticket #%(id)s has been "
                   "deleted.", num=comment_number, id=ticket_number))
