import os
from cgi import escape

from plone.app.form.validators import null_validator
from plone.fieldsets.form import FieldsetsEditForm
from zope.component import adapts
from zope.formlib import form
from zope.interface import Interface
from zope.interface import implements
from zope.schema import Int

from AccessControl import getSecurityManager
from AccessControl.Permissions import view_management_screens
from Acquisition import aq_inner
from Products.CMFCore.utils import getToolByName
from Products.CMFDefault.formlib.schema import SchemaAdapterBase
from Products.CMFPlone import PloneMessageFactory as _
from Products.CMFPlone.interfaces import IPloneSiteRoot
from Products.Five.browser.pagetemplatefile import ZopeTwoPageTemplateFile

from plone.app.controlpanel.interfaces import IPloneControlPanelForm


class IMaintenanceSchema(Interface):

    days = Int(title=_(u"Days of object history to keep after packing"),
        description=_(u"You should pack your database regularly. This number "
                       "indicates how many days of undo history you want to "
                       "keep. It is unrelated to versioning, so even if you "
                       "pack the database, the history of the content changes "
                       "will be kept. Recommended value is 7 days."),
        default=7,
        required=True)


class MaintenanceControlPanelAdapter(SchemaAdapterBase):

    adapts(IPloneSiteRoot)
    implements(IMaintenanceSchema)

    def __init__(self, context):
        pprop = getToolByName(context, 'portal_properties')
        self.context = pprop.site_properties

    def get_days(self):
        return self.context.number_of_days_to_keep

    def set_days(self, value):
        if isinstance(value, basestring):
            value = int(value)
        self.context.number_of_days_to_keep = value

    days = property(get_days, set_days)


class MaintenanceControlPanel(FieldsetsEditForm):
    """A simple form to pack the databases."""

    implements(IPloneControlPanelForm)

    template = ZopeTwoPageTemplateFile('maintenance.pt')
    form_fields = form.FormFields(IMaintenanceSchema)
    label = _(u'Maintenance')
    description = _(u"Zope server and site maintenance options.")
    form_name = _(u'Zope Database Packing')

    @form.action(_(u'Pack database now'), name=u'pack')
    def handle_edit_action(self, action, data):
        if not self.available():
            self.status = _(u'text_not_allowed_manage_server',
                            default=u'You are not allowed to manage the Zope server.')
            return
        form.applyChanges(self.context, self.form_fields, data, self.adapters)
        value = data.get('days', None)
        # skip the actual pack method in tests
        if value is not None and isinstance(value, int) and value >= 0:
            context = aq_inner(self.context)
            cpanel = context.unrestrictedTraverse('/Control_Panel')
            cpanel.manage_pack(days=value, REQUEST=None)
        self.status = _(u'Packed the database.')

    @form.action(_(u'Shut down'), validator=null_validator, name=u'shutdown')
    def handle_shutdown_action(self, action, data):
        if not self.available():
            self.status = _(u'text_not_allowed_manage_server',
                            default=u'You are not allowed to manage the Zope server.')
            return
        context = aq_inner(self.context)
        cpanel = context.unrestrictedTraverse('/Control_Panel')
        result = cpanel.manage_shutdown()
        return result

    @form.action(_(u'Restart'), validator=null_validator)
    def handle_restart_action(self, action, data):
        if not self.available():
            self.status = _(u'text_not_allowed_manage_server',
                            default=u'You are not allowed to manage the Zope server.')
            return
        context = aq_inner(self.context)
        cpanel = context.unrestrictedTraverse('/Control_Panel')
        url = self.request.get('URL')
        result = cpanel.manage_restart(url)
        return """<html>
        <head><meta HTTP-EQUIV=REFRESH CONTENT="10; URL=%s">
        </head>
        <body>Zope is restarting</body></html>
        """ % escape(url, 1)

    def available(self):
        root = aq_inner(self.context).getPhysicalRoot()
        sm = getSecurityManager()
        return sm.checkPermission(view_management_screens, root)

    def isRestartable(self):
        if os.environ.has_key('ZMANAGED'):
            return True
        return False

    def isDevelopmentMode(self):
        qi = getToolByName(self.context, 'portal_quickinstaller')
        return qi.isDevelopmentMode()

    def coreVersions(self):
        mt = getToolByName(self.context, 'portal_migration')
        versions = mt.coreVersions()
        versions['Instance'] = versions['Plone Instance']
        return versions

    def processTime(self):
        context = aq_inner(self.context)
        cpanel = context.unrestrictedTraverse('/Control_Panel')
        return cpanel.process_time()

    def dbSize(self):
        context = aq_inner(self.context)
        cpanel = context.unrestrictedTraverse('/Control_Panel')
        return cpanel.db_size()
