"""management and error screens

"""

__docformat__ = "restructuredtext en"

from time import strftime, localtime

from logilab.mtconverter import xml_escape

from cubicweb.selectors import none_rset, match_user_groups

from cubicweb.view import StartupView

def dict_to_html(w, dict):

    # XHTML doesn't allow emtpy <ul> nodes

    if dict:

        w(u'<ul>')

        for key in sorted(dict):

            w(u'<li><span class="label">%s</span>: <span>%s</span></li>' % (

                xml_escape(str(key)), xml_escape(repr(dict[key]))))

        w(u'</ul>')

class ProcessInformationView(StartupView):

    """display various web server /repository information"""

    __regid__ = 'info'

    __select__ = none_rset() & match_user_groups('managers')

    title = _('server information')

    def call(self, **kwargs):

        req = self._cw

        dtformat = req.property_value('ui.datetime-format')

        _ = req._

        w = self.w

        # generic instance information

        w(u'<h1>%s</h1>' % _('Instance'))

        w(u'<table>')

        w(u'<tr><th align="left">%s</th><td>%s</td></tr>' % (

            _('config type'), self._cw.vreg.config.name))

        w(u'<tr><th align="left">%s</th><td>%s</td></tr>' % (

            _('config mode'), self._cw.vreg.config.mode))

        w(u'<tr><th align="left">%s</th><td>%s</td></tr>' % (

            _('instance home'), self._cw.vreg.config.apphome))

        w(u'</table>')

        vcconf = req.vreg.config.vc_config()

        w(u'<h3>%s</h3>' % _('versions configuration'))

        w(u'<table>')

        w(u'<tr><th align="left">%s</th><td>%s</td></tr>' % (

            'CubicWeb', vcconf.get('cubicweb', _('no version information'))))

        for cube in sorted(self._cw.vreg.config.cubes()):

            cubeversion = vcconf.get(cube, _('no version information'))

            w(u'<tr><th align="left">%s</th><td>%s</td></tr>' % (

                cube, cubeversion))

        w(u'</table>')

        # repository information

        repo = req.vreg.config.repository(None)

        w(u'<h1>%s</h1>' % _('Repository'))

        w(u'<h3>%s</h3>' % _('resources usage'))

        w(u'<table>')

        stats = repo.stats()

        for element in sorted(stats):

            w(u'<tr><th align="left">%s</th><td>%s %s</td></tr>'

                   % (element, xml_escape(unicode(stats[element])),

                      element.endswith('percent') and '%' or '' ))

        w(u'</table>')

        if req.cnx._cnxtype == 'inmemory':

            w(u'<h3>%s</h3>' % _('opened sessions'))

            sessions = repo._sessions.values()

            if sessions:

                w(u'<ul>')

                for session in sessions:

                    w(u'<li>%s (%s: %s)<br/>' % (

                        xml_escape(unicode(session)),

                        _('last usage'),

                        strftime(dtformat, localtime(session.timestamp))))

                    dict_to_html(w, session.data)

                    w(u'</li>')

                w(u'</ul>')

            else:

                w(u'<p>%s</p>' % _('no repository sessions found'))

        # web server information

        w(u'<h1>%s</h1>' % _('Web server'))

        w(u'<table>')

        w(u'<tr><th align="left">%s</th><td>%s</td></tr>' % (

            _('base url'), req.base_url()))

        w(u'<tr><th align="left">%s</th><td>%s</td></tr>' % (

            _('data directory url'), req.datadir_url))

        w(u'</table>')

        from cubicweb.web.application import SESSION_MANAGER

        sessions = SESSION_MANAGER.current_sessions()

        w(u'<h3>%s</h3>' % _('opened web sessions'))

        if sessions:

            w(u'<ul>')

            for session in sessions:

                w(u'<li>%s (%s: %s)<br/>' % (

                    session.sessionid,

                    _('last usage'),

                    strftime(dtformat, localtime(session.last_usage_time))))

                dict_to_html(w, session.data)

                w(u'</li>')

            w(u'</ul>')

        else:

            w(u'<p>%s</p>' % _('no web sessions found'))

class RegistryView(StartupView):

    """display vregistry content"""

    __regid__ = 'registry'

    __select__ = StartupView.__select__ & match_user_groups('managers')

    title = _('registry')

    def call(self, **kwargs):

        self.w(u'<h1>%s</h1>' % _("Registry's content"))

        keys = sorted(self._cw.vreg)

        url = xml_escape(self._cw.url())

        self.w(u'<p>%s</p>\n' % ' - '.join('<a href="%s#%s">%s</a>'

                                           % (url, key, key) for key in keys))

        for key in keys:

            self.w(u'<h2 id="%s">%s</h2>' % (key, key))

            if self._cw.vreg[key]:

                values = sorted(self._cw.vreg[key].iteritems())

                self.wview('pyvaltable', pyvalue=[(key, xml_escape(repr(val)))

                                                  for key, val in values])

            else:

                self.w(u'<p>Empty</p>\n')

class GCView(StartupView):

    """display garbage collector information"""

    __regid__ = 'gc'

    __select__ = StartupView.__select__ & match_user_groups('managers')

    title = _('memory leak debugging')

    def call(self, **kwargs):

        from cubicweb._gcdebug import gc_info

        from rql.stmts import Union

        from cubicweb.appobject import AppObject

        from cubicweb.rset import ResultSet

        from cubicweb.dbapi import Connection, Cursor

        from cubicweb.web.request import CubicWebRequestBase

        lookupclasses = (AppObject,

                         Union, ResultSet,

                         Connection, Cursor,

                         CubicWebRequestBase)

        try:

            from cubicweb.server.session import Session, ChildSession, InternalSession

            lookupclasses += (InternalSession, ChildSession, Session)

        except ImportError:

            pass # no server part installed

        self.w(u'<h1>%s</h1>' % _('Garbage collection information'))

        counters, ocounters, garbage = gc_info(lookupclasses,

                                               viewreferrersclasses=())

        self.w(u'<h3>%s</h3>' % _('Looked up classes'))

        values = sorted(counters.iteritems(), key=lambda x: x[1], reverse=True)

        self.wview('pyvaltable', pyvalue=values)

        self.w(u'<h3>%s</h3>' % _('Most referenced classes'))

        values = sorted(ocounters.iteritems(), key=lambda x: x[1], reverse=True)

        self.wview('pyvaltable', pyvalue=values[:self._cw.form.get('nb', 20)])

        if garbage:

            self.w(u'<h3>%s</h3>' % _('Unreachable objects'))

            values = sorted(xml_escape(repr(o)) for o in garbage)

            self.wview('pyvallist', pyvalue=values)