#
#  Copyright (c) 2008 Helmut Merz helmutm@cy55.de
#
#  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 2 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, write to the Free Software
#  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#

"""
Adapter and view class(es) for statistics reporting.

$Id$
"""

from datetime import date, datetime
from zope import component
from zope.app.pagetemplate import ViewPageTemplateFile
from zope.app.security.interfaces import IAuthentication, PrincipalLookupError
from zope.cachedescriptors.property import Lazy
from zope.traversing.browser import absoluteURL
from zope.traversing.api import getName

from cybertools.util import format
from loops.browser.common import BaseView
from loops.interfaces import IResource
from loops import util
from loops.util import _


report_macros = ViewPageTemplateFile('report.pt')


class TrackingStats(BaseView):

    template = report_macros
    title = _(u'Tracking Statistics')

    @Lazy
    def macro(self):
        return self.macros['report']

    @Lazy
    def macros(self):
        return self.template.macros

    @Lazy
    def accessRecords(self):
        return self.filter(reversed(self.loopsRoot.getRecordManager()['access'].values()))

    @Lazy
    def changeRecords(self):
        return self.filter(reversed(self.loopsRoot.getRecordManager()['changes'].values()))

    def filter(self, tracks):
        for tr in tracks:
            try:
                if IResource.providedBy(util.getObjectForUid(tr.taskId)):
                    yield tr
            except KeyError:
                pass

    def getData(self):
        form = self.request.form
        period = form.get('period')
        uid = form.get('id')
        if period is not None:
            result = self.getPeriodDetails(period)
            macroName = 'period'
        elif uid is not None:
            result = self.getObjectDetails(uid)
            macroName = 'object'
        else:
            result = self.getOverview()
            macroName = 'overview'
        macro = self.macros[macroName]
        return dict(data=result, macro=macro)

    def getOverview(self):
        """ Period-based (monthly) listing of the numbers of object accesses, new,
            changed, [deleted] objects, number of resources at end of month.
        """
        periods = {}
        for track in self.accessRecords:
            ts = datetime.fromtimestamp(track.timeStamp)
            p = date(ts.year, ts.month, 1)
            periods.setdefault(p, dict(access=0, new=0, changed=0))
            periods[p]['access'] += 1
        for track in self.changeRecords:
            ts = datetime.fromtimestamp(track.timeStamp)
            p = date(ts.year, ts.month, 1)
            periods.setdefault(p, dict(access=0, new=0, changed=0))
            #periods[p]['new'] += 1
            if track.data['action'] == 'modify':
                periods[p]['changed'] += 1
            elif track.data['action'] == 'add':
                periods[p]['new'] += 1
        result = [dict(period=formatAsMonth(p), **periods[p])
                    for p in reversed(sorted(periods))]
        num = len(self.resourceManager)
        for data in result:
            data['count'] = num
            num = num - data['new']
        return result

    def getPeriodDetails(period):
        """ Listing of accessed, new, changed, [deleted] objects during
            the period given.
        """

    def getObjectDetails(uid, period=None):
        """ Listing of (last n?) accesses and changes of the object specified by
            the uid given, optionally limited to the period (month) given.
        """


class RecentChanges(TrackingStats):

    title = _(u'Recent Changes')

    def getData(self):
        length = int(self.request.form.get('length', 15))
        new = {}
        changed = {}
        result = []
        for track in self.changeRecords:
            if track.data['action'] == 'add' and track.taskId not in new:
                sameChanged = changed.get(track.taskId)
                if sameChanged and sameChanged.timeStamp < track.timeStamp + 60:
                    # change immediate after creation
                    if result[-1].taskId == track.taskId:
                        result.pop()
                new[track.taskId] = track
                result.append(track)
                continue
            if track.data['action'] == 'modify' and track.taskId not in changed:
                changed[track.taskId] = track
                result.append(track)
                continue
            if len(result) > length:
                break
        return dict(data=[TrackDetails(self, tr) for tr in result],
                    macro=self.macros['recent_changes'])


class TrackDetails(object):

    timeStampFormat = 'short'

    def __init__(self, view, track):
        self.view = view
        self.track = track

    @Lazy
    def authentication(self):
        return component.getUtility(IAuthentication)

    @Lazy
    def object(self):
        obj = util.getObjectForUid(self.track.taskId)
        node = self.view.nodeView
        url = node is not None and node.getUrlForTarget(obj) or ''
        return dict(object=obj, title=obj.title, url=url)

    @Lazy
    def user(self):
        obj = util.getObjectForUid(self.track.userName)
        if obj is None:
            try:
                userTitle = self.authentication.getPrincipal(userName)
            except PrincipalLookupError:
                userTitle = self.track.userName
            return dict(object=None, title=userTitle, url='')
        node = self.view.nodeView
        url = node is not None and node.getUrlForTarget(obj) or ''
        return dict(object=obj, title=obj.title, url=url)

    @Lazy
    def action(self):
        return self.track.data['action']

    @Lazy
    def timeStamp(self):
        value = datetime.fromtimestamp(self.track.timeStamp)
        return format.formatDate(value, 'dateTime', self.timeStampFormat,
                                 self.view.languageInfo.language)

    def __repr__(self):
        return repr(self.track)


def formatAsMonth(d):
    return d.isoformat()[:7]