trac-dvbcronrecording-plugin / src / dvbcronrecording / computer.py

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import time
import re
import datetime
import logging

from trac.core import Component #, implements
from trac.config import Option, ListOption, FloatOption, BoolOption

try:
    from channels import DvbCronRecordingChannelsPlugin
except:
    DvbCronRecordingChannelsPlugin = None

from translate import Translate

DEBUG = False
PACKAGE = 'dvbcronrecording'
NAV = 'recordings'
URL = 'recording'

default_adapter = u"0"

def intnull(value, default = None):
    if value is None: return default
    try: return int(value)
    except Exception: return default
    
def ustar(text):
    if text is None:
        return "*"
    return u"%s" % text

class ChainEntry:
    def __init__(self):
        self.entry = None
        self.after = []
        self.message = ""

class RecorderItem:
    """ converting the database entry - which is similar to what
        the user entered in the input form fields - to an object
        with computable data attributes. Note that newtime/endtime
        are given as minutes-since-midnight. """
    def __init__(self):
        self.entry = None # the original entry
        self.weekday = None
        self.onlydate = None
        self.onlyday = None
        self.months = []
        self.newtimeMMM = 0
        self.endtimeMMM = 0
        self.extratimeM = 0
        self.channelname = None
        self.title = ""
        self.message = ""
        self.rank = 0.0
        self.cloned = None
        self.adapter = None
    def clone(self):
        item = RecorderItem()
        item.entry = self.entry
        item.weekday = self.weekday
        item.onlydate = self.onlydate
        item.onlyday = self.onlyday
        item.months = self.months
        item.newtimeMMM = self.newtimeMMM
        item.endtimeMMM = self.endtimeMMM
        item.extratimeM = self.extratimeM
        item.channelname = self.channelname
        item.title = self.title
        item.message = self.message
        item.rank = self.rank 
        item.cloned = self
        item.adapter = self.adapter
        return item
    def __unicode__(self):
        months = u",".join([unicode(month) for month in self.months])
        x = u"{ "
        x += u" [%s-%s]+%s" % (MMMtoHHMM(self.newtimeMMM), MMMtoHHMM(self.endtimeMMM), self.extratimeM)
        x += u" %s@%s" % (self.channelname, ustar(self.adapter))
        x += u" (%s %s %s)" % (ustar(self.onlyday), ustar(months), ustar(self.weekday))
        x += u" '%s'" % (unicode(self.title))
        x += u" }"
        return x
    def __str__(self):
        return unicode(self).encode("UTF-8")
    
class RecorderGroup:
    def __init__(self):
        self.items = [] # RecordingItem
        self.weekday = None
        self.newtimeMMM = None
        self.endtimeMMM = None
        self.extratimeM = None
        self.adapter = None
    def __unicode__(self):
        return u"[%s]" % (u",\n  ".join([unicode(item) for item in self.items]))
    def __str__(self):
        return unicode(self)

class RecorderGroupPlan:
    def __init__(self):
        self._groups = []
    def items(self):
        groupcount = 0
        for group in self._groups:
            if not group.items: continue
            for item in group.items:
                item.groupcount = groupcount
                yield item
            groupcount += 1
            yield None # group seperator
    def groups(self):
        for group in self._groups:
            yield group
    def addgroup(self, group):
        self._groups += [ group ]
    def sort(self):
        """ weekday, starttime, adapter """
        groups = sorted(self._groups, key = lambda x: (x.weekday, x.newtimeMMM, x.adapter))
        self._groups = groups
    def timelist_sort(self):
        """ datetimeX, datetimeY, adapter from timelist_groups() """
        groups = sorted(self._groups, key = lambda x: (x.datetimeX, x.datetimeY, x.adapter))
        self._groups = groups
    def __unicode__(self):
        groups = [unicode(item) for item in self._groups]
        return u"\n{%s}" % (u",\n ".join(groups))
    def __str__(self):
        return unicode(self)

class RecorderFlatPlan:
    def __init__(self):
        self._items = []
    def items(self):
        return self._items
    def additem(self, item):
        self._items += [ item ]
    def deleted_items(self):
        for item in self._items:
            if item.newtimeMMM == item.endtimeMMM:
                yield item

class RecorderTime:
    def __init__(self, orig = None):
        self.item = orig
        self.message = ""
        self.datetimeX = None
        self.datetimeY = None
        self.deleted = False
        self.newtimeMMM = 0
        self.endtimeMMM = 0
        self.extratimeM = 0
        self.adapter = None
        self.adapters = [ default_adapter ]
        self.set(orig)
    def set(self, orig):
        if orig is not None:
            self.newtimeMMM = orig.newtimeMMM
            self.endtimeMMM = orig.endtimeMMM
            self.extratimeM = orig.extratimeM
        return self
    def __unicode__(self):
        return u"[%s - %s] %s" % (self.datetimeX, self.datetimeY, unicode(self.item))
    def __str__(self):
        return unicode(self).encode("UTF-8")

months_ahead = 3
    
class DvbCronRecordingPlanComputer(Component):
    """ it is a component but it does not have its own database tables - it 
        just helps to turn the recording list into a proper recording plan. """
        
    algorithm = Option(PACKAGE, "planning-algorithm", "plan4",
                       doc="Choose the planning type plan1,plan2,plan3,plan4")
    rankup_channels = ListOption(PACKAGE, "planning-rankup-channels","3sat,arte",
                       doc="Choose the channels to implicitly rank higher")
    rankup_value = FloatOption(PACKAGE, "planning-rankup-value", 0.3,
                        doc="Amount of rank increment for the rankup-channels") 
    onlydate_rankup = FloatOption(PACKAGE, "planning-onlydate-rankup", 0.5,
                        doc="Amount of rank increment for single date recordings") 
    
    def __init__(self):
        self._adapters = {}
        self._adapterlist = None
        self._localtime = None
        self.logg = logging.getLogger(__name__)
    def localtime(self):
        if self._localtime is not None:
            return self._localtime # for unittests
        return time.localtime()
    def adapters(self, channelname):
        if channelname in self._adapters:
            return self._adapters[channelname]
        return [ default_adapter ]
    def set_adapters_from_channels_list(self, channelslist):
        for entry in channelslist:
            channelname = entry.channelname
            adapter = ustar(entry.adapter)
            if channelname not in self._adapters:
                self._adapters[channelname] = []
            if adapter not in self._adapters[channelname]:
                self._adapters[channelname] += [ adapter ]
        self.update_adapterlist()
    def update_adapterlist(self):
        """ for all channels create the union of their available adapters """
        adapterlist = []
        for adapters in self._adapters.values():
            for adapter in adapters:
                if adapter and adapter not in adapterlist:
                    adapterlist += [ ustar(adapter) ]
        self._adapterlist = adapterlist
    def adapterlist(self):
        """ get the union of available adapters used in configured channels """
        if self._adapterlist is None:
            self.update_adapterlist()
        adapterlist = self._adapterlist[:]
        if not adapterlist:
            return [ default_adapter ]
        if default_adapter not in adapterlist:
            adapterlist += [ default_adapter ]
        return adapterlist
            
    def channels_list(self):
        if DvbCronRecordingChannelsPlugin is None:
            return [ 0 ]
        channels = DvbCronRecordingChannelsPlugin(self.env)
        return channels.channels_list()
    
    # ======================================================================
    def zero(self, spec):
        if not spec: return 0
        return int(spec)
    
    """ 
        This is doing the actual computations
    """
    def _entries_to_startchain(self, entries):
        weekday1 = None
        endtime1 = None
        extratime1 = None
        start = []
        chain = None
        for entry in entries:
            if entry["status"] == "no": continue
            newtime2 = self.zero(self.minutes(entry["newtime"]))
            endtime2 = self.zero(self.minutes(entry["endtime"]))
            extratime2 = self.zero(self.minutes(entry["extratime"]))
            weekday2 = intnull(entry["weekday"])
            if endtime2 < newtime2: endtime2 += 24*60
            if endtime2 == endtime1: continue
            isafter = False
            if endtime1 is not None:
                if not weekday1 : weekday1 = 0
                if not weekday2 : weekday2 = 0
                daytime1 = weekday1 * 24 * 60
                daytime2 = weekday2 * 24 * 60
                message = " [%s < %s]" % (daytime1+endtime1+extratime1, daytime2+newtime2)
                if daytime1+endtime1+extratime1 >= daytime2+newtime2:
                    isafter = True
            else:
                message = " [FIRST] "
            if chain: chain.message += message
            if isafter:
                chain.after += [ entry ]
            else:
                if chain is not None:
                    start += [ chain ] 
                chain = ChainEntry()
                chain.entry = entry
                chain.after = []
            weekday1 = weekday2
            endtime1 = endtime2
            extratime1 = extratime2
        return start


    def minutes(self, spec):
        """ convert HH:MM spec into minutes (since midnight if not an interval) """
        m = re.match("(\d+):(\d+)", spec)
        if m: return int(m.group(1))*60 + int(m.group(2))
        m = re.match("(\d+)", spec)
        if m: return int(m.group(1))
        return None
    
    def get_allowed_months(self, ahead = months_ahead):
        this_month = self.localtime().tm_mon
        allowed = []
        for add_months in xrange(months_ahead):
            month = this_month + add_months
            if month > 12: month -= 12
            if month > 12: continue
            if month not in allowed:
                allowed += [ month ]
        return allowed
    
    def get_past_days_this_month(self):
        today = self.localtime()
        this_month = today.tm_mon
        this_day = today.tm_mday
        allowed = []
        for day in xrange(1, this_day):
            allowed += [ (day, this_month) ]
        return allowed
    
    """
       check this month and the next 3 months whether there are
       entries with 'onlydate' that would only run once.
    """
    def recordinglist_to_recorderitems(self, entries, ahead = months_ahead):
        allowed_months = self.get_allowed_months(ahead)
        past_days = self.get_past_days_this_month()
        self.logg.debug("    allowed_months %s" % (str(allowed_months)))    
        for entry in entries:
            if entry.status == "no": 
                self.logg.debug("    status disabled for %s", entry.title) 
                continue
            item = RecorderItem()
            item.channelname = entry.channelname
            item.title = entry.title
            if not item.title:
                self.logg.debug("    item had not title") 
                continue            
            if not item.channelname: 
                self.logg.debug("    no channel name for '%s", item.title) 
                continue            
            m = re.match("(\d+)[.](\d+)[.]", entry.onlydate)
            if m:
                self.logg.debug("    onlydate %s for %s", entry.onlydate, item.title)
                try:
                    onlyday = intnull(m.group(1))
                    onlymonth = intnull(m.group(2))
                    if not onlyday: continue
                    if not onlymonth: continue
                    if onlymonth not in allowed_months:
                        self.logg.debug("    onlymonth not in allowed_months '%s'", item.title) 
                        continue
                    if (onlyday, onlymonth) in past_days: 
                        self.logg.debug("    (onlyday, onlymonth) in past_days '%s'", item.title) 
                        continue
                    item.onlyday = onlyday
                    item.months = [ onlymonth ]
                    self.logg.debug("    onlyday %s onlymonths %s for %s", item.onlyday, item.months, item.title)
                except Exception:
                    self.logg.debug("    conversion error %s '%s'", entry.onlydate, item.title)
                item.weekday = intnull(entry.weekday)
            else: 
                item.weekday = intnull(entry.weekday)
                if item.weekday is None:
                    self.logg.debug("    item.weekday is None '%s'", item.title) 
                    continue
                if item.weekday >= 7: item.weekday = item.weekday % 7
            item.newtimeMMM = self.zero(self.minutes(entry.newtime))
            item.endtimeMMM = self.zero(self.minutes(entry.endtime))
            item.extratimeM = self.zero(self.minutes(entry.extratime))
            try: item.rank = float(int(entry.priority))
            except: pass
            if item.channelname in self.rankup_channels:
                item.rank += self.rankup_value
            self.logg.debug("    originally %s-%s '%s'" % (entry.newtime, entry.endtime, item.title))
            yield item
    def recordinglist_to_recordergroups(self, entries, ahead = months_ahead):
        recorderitems = list(self.recordinglist_to_recorderitems(entries, ahead))
        onlymonths = []
        for item in recorderitems:
            for month in item.months: 
                if month not in onlymonths:
                    onlymonths.append(month)
        self.logg.debug("    onlymonths %s", onlymonths)
        regularmonths = [ month for month in xrange(1,13) if month not in onlymonths ]
        self.logg.debug("    regularmonths %s", regularmonths)
        localtime = self.localtime()
        this_month = localtime.tm_mon
        this_year = localtime.tm_year
        past_days = self.get_past_days_this_month()
        for month in sorted(onlymonths):
            year = this_year
            if month < this_month: year += 1
            for day in xrange(1,32):
                if (day, month) in past_days: continue
                try:
                    # ValueError if invalid day-of-month
                    date = datetime.date(year, month, day)
                    # no generate the recordings for that day
                    items = self.clone_filtered_for_date(recorderitems, date)
                    for group in self.recordergroups_from_filtered(items):
                        self.logg.debug("    onlydate group %s", unicode(group))
                        yield group
                except ValueError:
                    pass # expected
        items = self.clone_filtered_for_regular(recorderitems, regularmonths)
        self.logg.debug("=======================================================")
        items = list(items)
        for item in items:
            self.logg.debug("    regular item %s", unicode(item))
        for group in self.recordergroups_from_filtered(items):
            self.logg.debug("    regular group %s", unicode(group))
            yield group
    def clone_filtered_for_date(self, recorderitems, date):
        for item in recorderitems:
            if item.onlyday: 
                if item.onlyday != date.day: continue
            elif item.months:
                if date.month not in item.months: continue
            else:
                if item.weekday != date.weekday(): continue
            newitem = item.clone()
            newitem.onlydate = date
            newitem.onlyday = date.day
            newitem.months = [ date.month ]
            newitem.weekday = date.weekday()
            if item.onlyday: 
                newitem.rank += self.onlydate_rankup
            yield newitem
    def clone_filtered_for_regular(self, recorderitems, regularmonths):
        for item in recorderitems:
            if item.onlyday: continue
            if item.months: continue
            newitem = item.clone()
            newitem.months = regularmonths
            yield newitem
    def recordergroups_from_filtered(self, recorderitems):
        """ group items into recordings with overlapping time intervals """    
        group = None
        previous = None
        nextday = 0
        for item in recorderitems:
            newtimeMMM = item.newtimeMMM
            endtimeMMM = item.endtimeMMM
            extratimeM = item.extratimeM 
            if group is None: # first run
                group = RecorderGroup()
                group.weekday = item.weekday
                group.newtimeMMM = newtimeMMM
            elif group.endtimeMMM + group.extratimeM < newtimeMMM + nextday:
                yield group # non-recording interval
                group = RecorderGroup()
                group.weekday = item.weekday
                group.newtimeMMM = newtimeMMM
            else: # overlapping?
                assert previous is not None # because of first run
                previous_ended_weekday = previous.weekday
                if previous.endtimeMMM < previous.newtimeMMM:
                    previous_ended_weekday += 1
                if item.weekday != previous_ended_weekday:
                    yield group # non-recording interval
                    group = RecorderGroup()
                    group.weekday = item.weekday
                    group.newtimeMMM = newtimeMMM
                pass 
            if endtimeMMM < newtimeMMM:
                nextday = 24*60
            group.endtimeMMM = endtimeMMM + nextday 
            group.extratimeM = extratimeM
            group.items += [ item ]
            previous = item
        if group is not None and group.endtimeMMM is not None:
            yield group
    def tuning_split_recordergroup(self, group, channels):
        """ this function is supposed to get a list of adapters and
            the channels that can be tuned on them. The recordings
            of the recordergroup can then be scheduled to different
            transponders and returned. Additionally, each item in the
            returned groups has its endtimeMMM set so that the difference
            of newtime-endtime is the recording time interval. """
        yield self.adjust_recordergroup(group) 
    def adjust_recordergroup(self, group):
        self.logg.debug("    adjust group %s", unicode(group))
        nextday = 0
        previous = None
        for item in group.items:
            if previous is None:
                previous = item
                continue
            if item.endtimeMMM < item.newtimeMMM:
                nextday = 24 * 60
            if previous.rank > item.rank:
                item_newtime = item.newtimeMMM
                item.newtimeMMM = previous.endtimeMMM + previous.extratimeM
                if item_newtime != item.newtimeMMM:
                    item.message += " %s >>" % MMMtoHHMM(item_newtime) 
                    item.message += " %s;" % MMMtoHHMM(item.newtimeMMM)
            elif previous.rank < item.rank:
                previous_endtime = previous.endtimeMMM
                previous.endtimeMMM = item.newtimeMMM
                previous.extratimeM = 0
                if previous_endtime != previous.endtimeMMM:
                    previous.message += " %s << " % MMMtoHHMM(previous.endtimeMMM)
                    previous.message += " %s;" % MMMtoHHMM(previous_endtime)
            elif item.newtimeMMM < previous.endtimeMMM + previous.extratimeM:
                item_newtime = item.newtimeMMM
                item.newtimeMMM = previous.endtimeMMM + previous.extratimeM
                if item_newtime != item.newtimeMMM:
                    item.message += " %s ->" % MMMtoHHMM(item_newtime)
                    item.message += " %s;;" % MMMtoHHMM(item.newtimeMMM)
            if item.endtimeMMM + nextday <= item.newtimeMMM:
                item.endtimeMMM = item.newtimeMMM
                item.extratimeM = 0
                item.message += " [DEL]"
            elif previous.endtimeMMM == previous.newtimeMMM:
                previous.message += " [DEL]"
            previous = item
            nextday = 0
        return group
    def make_cronmonths(self, group):
        self.logg.debug("    adjust group %s", unicode(group))
        for item in group.items:
            ranges = []
            months = item.months
            if len(months) > 1:
                start = None
                previous = None
                for month in months:
                    if start is None:
                        start = month
                        previous = month
                    elif month == previous + 1:
                        previous = month
                    else:
                        ranges += [ (start,previous) ]
                        start = month
                        previous = month
                ranges += [ (start,previous) ]
            else:
                ranges += [ (months[0],months[0])]
            item.cronmonths = ranges
        return group
    def plan1(self, req, entries):
        """ main entry point """
        plan = RecorderGroupPlan()
        for group in self.recordinglist_to_recordergroups(entries):
            group = self.adjust_recordergroup(group)
            group = self.make_cronmonths(group)
            plan.addgroup(group)
        return plan
    def recordinglist_to_flat_recorderitems(self, entries, ahead = months_ahead):
        recorderitems = list(self.recordinglist_to_recorderitems(entries, ahead))
        localtime = self.localtime()
        this_month = localtime.tm_mon
        this_year = localtime.tm_year
        past_days = self.get_past_days_this_month()
        for month in list(xrange(this_month,13)) + list(xrange(1, this_month)):
            year = this_year
            if month < this_month: year += 1
            for day in xrange(1,32):
                if (day, month) in past_days: continue
                try:
                    # ValueError if invalid day-of-month
                    date = datetime.date(year, month, day)
                    for item in self.clone_filtered_for_date(recorderitems, date):
                        yield item
                except:
                    pass
    def adjust_flat_recorderitems(self, itemlist):
        previous = None
        for item in itemlist:
            if item is None:
                continue # old group separator
            if item.endtimeMMM == item.newtimeMMM:
                continue # deleted element
            if previous is None:
                previous = item
                continue
            item_newtimeMMM = item.newtimeMMM
            if previous.onlydate == item.onlydate:
                pass
            elif previous.onlydate + datetime.timedelta(1) == item.onlydate:
                item_newtimeMMM += 24 * 60
            else:
                previous = None
                continue # items are separate by more than a day
            if previous.endtimeMMM + previous.extratimeM < item_newtimeMMM:
                previous = None
                continue # separate by at least a few minutes
            # -------------------------------------------------
            nextday = 0
            if item.endtimeMMM < item.newtimeMMM:
                nextday = 24 * 60
            if previous.rank > item.rank:
                item_newtime = item.newtimeMMM
                item.newtimeMMM = previous.endtimeMMM + previous.extratimeM
                if item_newtime != item.newtimeMMM:
                    item.message += " %s >>" % MMMtoHHMM(item_newtime) 
                    item.message += " %s;" % MMMtoHHMM(item.newtimeMMM)
            elif previous.rank < item.rank:
                previous_endtime = previous.endtimeMMM
                previous.endtimeMMM = item.newtimeMMM
                previous.extratimeM = 0
                if previous_endtime != previous.endtimeMMM:
                    previous.message += " %s << " % MMMtoHHMM(previous.endtimeMMM)
                    previous.message += " %s;" % MMMtoHHMM(previous_endtime)
            elif item.newtimeMMM < previous.endtimeMMM + previous.extratimeM:
                item_newtime = item.newtimeMMM
                item.newtimeMMM = previous.endtimeMMM + previous.extratimeM
                if item_newtime != item.newtimeMMM:
                    item.message += " %s ->" % MMMtoHHMM(item_newtime)
                    item.message += " %s;;" % MMMtoHHMM(item.newtimeMMM)
            if item.endtimeMMM + nextday <= item.newtimeMMM:
                item.endtimeMMM = item.newtimeMMM
                item.extratimeM = 0
                item.message += " [DEL]"
            elif previous.endtimeMMM == previous.newtimeMMM:
                previous.message += " [DEL]"
            previous = item
    def recorderitems_groups(self, itemlist):
        group = None
        for item in itemlist: 
            if not group:
                group = RecorderGroup()
                group.weekday = item.weekday
                group.firstdate = item.onlydate
                group.newtimeMMM = item.newtimeMMM
                group.endtimeMMM = item.endtimeMMM
                group.extratimeM = item.extratimeM
                group.items += [ item ]
                continue
            delta = item.onlydate - group.firstdate
            deltaMMM = delta.days * 24 * 60
            if group.endtimeMMM < item.newtimeMMM + deltaMMM:
                yield group
                group = RecorderGroup()
                group.weekday = item.weekday
                group.firstdate = item.onlydate
                group.newtimeMMM = item.newtimeMMM
                group.endtimeMMM = item.endtimeMMM
                group.extratimeM = item.extratimeM
                group.items += [ item ]
            else:
                group.endtimeMMM = item.endtimeMMM + deltaMMM
                group.extratimeM = item.extratimeM
                group.items += [ item ]
        if group is not None:
            yield group
    def deleted_items(self, itemlist):
        for item in itemlist:
            if item.newtimeMMM == item.endtimeMMM:
                yield item
    def plan2(self, req, entries):
        """ main entry point """
        itemlist = list(self.recordinglist_to_flat_recorderitems(entries))
        deleted = 0
        for round in xrange(10):
            self.adjust_flat_recorderitems(itemlist)
            newdeleted = len(list(self.deleted_items(itemlist)))
            if newdeleted > deleted:
                continue
        plan = RecorderGroupPlan()
        for group in self.recorderitems_groups(itemlist):
            plan.addgroup(group)
        group = RecorderGroup()
        item = RecorderItem()
        item.message = "itemlist length %s" % len(itemlist)
        group.items += [ item ]
        plan.addgroup(group)        
        return plan
    def recordinglist_to_recordertimelist(self, entries, ahead = months_ahead):
        recorderitems = list(self.recordinglist_to_recorderitems(entries, ahead))
        localtime = self.localtime()
        this_month = localtime.tm_mon
        this_year = localtime.tm_year
        past_days = self.get_past_days_this_month()
        for month in list(xrange(this_month,13)) + list(xrange(1, this_month)):
            year = this_year
            if month < this_month: year += 1
            for day in xrange(1,32):
                if (day, month) in past_days: continue
                date = None
                try:
                    # ValueError if invalid day-of-month
                    date = datetime.datetime(year, month, day)
                except ValueError, e:
                    pass
                if date is None:
                    continue
                try:
                    # self.logg.debug("    %s datetime(%s,%s,%s)", len(recorderitems), year, month, day)
                    for item in recorderitems:
                        if item.onlyday: 
                            if item.onlyday != date.day: continue
                            if date.month not in item.months: continue
                        elif item.months:
                            if date.month not in item.months: continue
                        else:
                            if item.weekday != date.weekday(): continue
                        # self.logg.debug("    ITEM %s", item)
                        newtimeMMM = item.newtimeMMM
                        endtimeMMM = item.endtimeMMM
                        if endtimeMMM < newtimeMMM: endtimeMMM += 24 * 60
                        endtimeMMM += item.extratimeM
                        elem = RecorderTime(item)
                        elem.datetimeX = date + datetime.timedelta(minutes = newtimeMMM)
                        elem.datetimeY = date + datetime.timedelta(minutes = endtimeMMM)
                        elem.adapters = self.adapters(item.channelname)
                        # elem.message += " (([%s .. %s] from %s..%s))" % (elem.datetimeX, elem.datetimeY, newtimeMMM, endtimeMMM)
                        yield elem
                except Exception, e:
                    self.logg.error("ERROR %s", e)
                except:
                    self.logg.error("FATAL ERROR")
    def adjust_recordertimelist(self, req, recordertimelist, adapter = None):
        """ recordertimelist contains absolute X Y dates """
        _ = Translate(PACKAGE, req.locale)
        minimum = datetime.timedelta(minutes = 2)
        previous = None
        for current in recordertimelist:
            if current.deleted:
                continue
            if adapter is not None and current.adapter is not None:
                if adapter != current.adapter:
                    continue
            if previous is None:
                previous = current
                continue
            if previous.datetimeY <= current.datetimeX:
                previous = current
                continue # nothing to do - there is a gap
            overlapY = previous.datetimeY - current.datetimeX
            overlapM = deltaM(overlapY)
            assert overlapM > 0
            if previous.item.rank < current.item.rank:
                if previous.datetimeX > current.datetimeX:
                    if previous.datetimeY < current.datetimeY:
                        # previous is fully inside the current times -> delete
                        previous.message += _(" deleted as moved inside")
                        previous.datetimeY = previous.datetimeX
                        previous.newtimeMMM = previous.endtimeMMM
                        previous.extratimeM = 0
                        previous.deleted = True
                        previous = current
                        continue
                    else:
                        # we would actually need to swap it around
                        # the previous gets a start time after current.
                        previous.message += _(" previous moved after next recording - swapped around,")
                        previous.datetimeX = current.datetimeY
                        previous.newtimeMMM = current.endtimeMMM + current.extratimeM
                        # we try to keep the computation correct by letting
                        # the previous item to stay.
                        previous = previous
                        continue 
                        # msg = (u"previous starts after current\nPREV %s\nNEXT %s" 
                        #        % (previous, current))
                        # raise Exception(msg)                        
                # move previous endtime down
                if overlapM <= previous.extratimeM:
                    previous.extratimeM -= overlapM
                    previous.datetimeY -= overlapY
                    if current.item.channelname != previous.item.channelname:
                        previous.message += _(" extra minutes minus %03d,") % overlapM
                    else:
                        previous.message += _(" continues")
                    previous = current
                else: 
                    extraY = datetime.timedelta(minutes = previous.extratimeM)
                    previous.datetimeY -= extraY
                    previous.extratimeM = 0 
                    if current.datetimeX <= previous.datetimeX:
                        previous.deleted = True
                        previous.datetimeY = previous.datetimeX
                        previous.endtimeMMM = previous.newtimeMMM
                        previous.extratimeM = 0
                        previous.message += _(" deleted as next one starts %s,") % MMMtoHHMM(current.newtimeMMM)
                    else:
                        if previous.datetimeY > current.datetimeX:
                            previous.datetimeY = current.datetimeX
                            previous.endtimeMMM = current.newtimeMMM
                            if current.item.channelname != previous.item.channelname:
                                previous.message += _(" end time set to next start %s,") % MMMtoHHMM(current.newtimeMMM)
                            else:
                                previous.message += _(" continues")
                        if previous.datetimeY - previous.datetimeX < minimum:
                            previous.deleted = True
                            previous.datetimeY = previous.datetimeX
                            previous.endtimeMMM = previous.newtimeMMM
                            previous.extratimeM = 0
                            previous.message += _(" and deleted as it is too short now")
                        else:
                            previous = current
            else: # previous.item.rank >= current.item.rank
                # ..move current starttime up
                if previous.datetimeX > current.datetimeX:
                    if previous.datetimeX >= current.datetimeY:
                        msg = (u"previous starts after current\nPREV %s\nNEXT %s" 
                               % (previous, current))
                        raise Exception(msg)
                    else:
                        current.datetimeX = previous.datetimeX
                        current.newtimeMMM = previous.endtimeMMM
                        current.message += _(" set start time to previous start %s,") % MMMtoHHMM(current.newtimeMMM)
                        assert previous.datetimeY > current.datetimeX
                if current.datetimeY <= previous.datetimeY:
                    if previous.datetimeX > current.datetimeX:
                        current.message+= _(" previous starts after current")
                    current.deleted = True
                    current.datetimeX = current.datetimeY
                    current.newtimeMMM = current.endtimeMMM
                    current.extratimeM = 0
                    current.message += _(" deleted as previous one ends %s,") % MMMtoHHMM(previous.endtimeMMM)
                else:
                    if current.datetimeX < previous.datetimeY:
                        current.datetimeX = previous.datetimeY
                        # current.item.weekday = current.datetimeX.weekday
                        # if current.item.onlyday: # might have crossed midnight 
                        #    current.item.onlyday = current.datetimeX.day
                        #    current.item.months = [ current.datetimeX.month ] 
                        current.newtimeMMM = previous.endtimeMMM + previous.extratimeM
                        if current.item.channelname != previous.item.channelname:
                            current.message += _(" set start time to previous end %s,") % MMMtoHHMM(current.newtimeMMM)
                        else:
                            current.message += _(" continues")
                    if current.datetimeY - current.datetimeX < minimum:
                        current.deleted = True
                        current.datetimeX = current.datetimeY
                        current.newtimeMMM = current.endtimeMMM
                        current.extratimeM = 0
                        current.message += _(" and deleted as it is too short now")
                    else:
                        previous = current
    def assign_adapters_for_timelist(self, recordertimelist):
        """ initialized recording adapter - if recordings overlap
            and one of them has multiple adapter options than assign
            one of the secondary adapters available.  """
        previous = None
        for current in recordertimelist:
            if current.deleted:
                continue
            if current.adapters:
                current.adapter = current.adapters[0]
            if previous is None:
                previous = current
                continue
            if previous.datetimeY <= current.datetimeX:
                previous = current
                continue # nothing to do - there is a gap
            overlapY = previous.datetimeY - current.datetimeX
            overlapM = deltaM(overlapY)
            assert overlapM > 0
            if previous.item.channelname == current.item.channelname:
                previous = current
                continue
            done = False
            if not done:
                if previous.item.rank < current.item.rank:
                    for adapter in previous.adapters:
                        if adapter != current.adapter:
                            previous.adapter = adapter
                            done = True; break
                    for adapter in current.adapters:
                        if adapter != previous.adapter:
                            current.adapter = adapter
                            done = True; break
                else:
                    for adapter in current.adapters:
                        if adapter != previous.adapter:
                            current.adapter = adapter
                            done = True; break
                    for adapter in previous.adapters:
                        if adapter != current.adapter:
                            previous.adapter = adapter
                            done = True; break
            if not done:
                # can not split overlapping recordings to different adapers
                pass
    def timelist_groups(self, req, timelist, adapter = None):
        _ = Translate(PACKAGE, req.locale)
        group = None
        previous = None
        previousgroup = None
        predeletes = []
        seen = ""
        for elem in timelist:
            self.logg.debug("    timelist_groups: adapter '%s' -vs- '%s'",
                      adapter, elem.adapter)            
            if adapter is not None and elem.adapter is not None:
                if adapter != elem.adapter:
                    continue
            item = elem.item.clone()
            item.newtimeMMM = elem.newtimeMMM
            item.endtimeMMM = elem.endtimeMMM
            item.extratimeM = elem.extratimeM
            item.weekday = elem.datetimeX.weekday()
            item.onlyday = elem.datetimeX.day
            item.months = [ elem.datetimeX.month ]
            item.adapter = elem.adapter
            if item.newtimeMMM != elem.item.newtimeMMM:
                item.message += " [%s]>>[%s]" % (MMMtoHHMM(elem.item.newtimeMMM), MMMtoHHMM(item.newtimeMMM))
            if item.endtimeMMM != elem.item.endtimeMMM:
                item.message += " [%s]<<[%s]" % (MMMtoHHMM(item.endtimeMMM), MMMtoHHMM(elem.item.endtimeMMM))
            # ==>
            if not group or elem.datetimeX > previous.datetimeY:
                # START or TIME GAP
                if group:
                    yield group ; previousgroup = group; group = None
                item.message = " ."+item.message
                if elem.deleted: 
                    item.message += _(" [DEL]")
                    predeletes += [ item ]
                else:
                    previous = elem
                    group = RecorderGroup()
                    group.datetimeX = elem.datetimeX
                    group.datetimeY = elem.datetimeY
                    group.weekday = item.weekday
                    group.newtimeMMM = item.newtimeMMM
                    group.endtimeMMM = item.endtimeMMM
                    group.extratimeM = item.extratimeM
                    group.adapter = item.adapter
                    group.items = predeletes + [ item ]
                    predeletes = []
            else:
                # HANDOVER
                item.message = " :"+item.message
                if elem.deleted: 
                    item.message += _(" [DEL]")
                    group.items += [ item ]
                else:
                    previous = elem
                    group.datetimeY = elem.datetimeY
                    group.endtimeMMM = item.endtimeMMM
                    group.extratimeM = item.extratimeM
                    group.items += [ item ]
            item.message += elem.message + seen
        if predeletes:
            if group:
                group.items += predeletes
            elif previousgroup:
                previousgroup.items += predeletes
        if group:
            # END
            yield group ; group = None
    def reduce_regular_groups(self, plan):
        class BlockGroup:
            def __init__(self):
                self.groups = []
        blocks = {}
        for group in plan.groups():
            group.deleted = False
            group.weekday = group.items[0].weekday
            group.hasonlydays = 0
            key = ""
            for item in group.items:
                key += "%02i%04i%04i(%s)" % (item.weekday, item.newtimeMMM, item.endtimeMMM, item.channelname)
                if item.cloned and item.cloned.onlyday:
                    group.hasonlydays += 1
            # key = (group.weekday, group.newtimeMMM, group.endtimeMMM, group.extratimeM)
            if key not in blocks:
                blocks[key] = BlockGroup()
            blocks[key].groups += [ group ]
        for key, block in blocks.items():
            block.master = None
            months_with_onlydays = []
            for group in block.groups:
                month = group.items[0].months[0]
                if group.hasonlydays:
                    if month not in months_with_onlydays:
                        months_with_onlydays += [ month ]
            # now we have a candidate of groups that we want to collapse
            block.months = [ month for month in xrange(1,13) 
                            if month not in months_with_onlydays ]
            for group in block.groups:
                month = group.items[0].months[0]
                if month not in block.months: # month in months_with_onlydays
                    continue
                if block.master is None:
                    block.master = group
                    for item in group.items:
                        item.onlyday = None
                        item.months = block.months
                    self.make_cronmonths(group)
                else:
                    group.deleted = True
                    for item in group.items:
                        item.onlyday = None
                        item.months = []
        newplan = RecorderGroupPlan()
        for group in plan.groups():
            if group.deleted: continue
            newplan.addgroup(group)
        return newplan           
    def new_reduce_regular_groups(self, plan):
        class Similar:
            def __init__(self, value):
                self.serial = value
                self.groups = []
        serial = 1000
        similar = {}
        for group in plan.groups():
            group.deleted = False
            group.weekday = group.items[0].weekday
            group.hasonlydays = []
            key = ""
            for item in group.items:
                if not key and item.adapter:
                    key = "(%s)" % item.adapter
                key += "%02i%04i%04i(%s)" % (item.weekday, item.newtimeMMM, item.endtimeMMM, item.channelname)
                if item.cloned and item.cloned.onlyday:
                    group.hasonlydays += [ item.cloned.months[0] ]
            if key not in similar:
                similar[key] = Similar(serial)
                serial += 1
            similar[key].groups += [ group ]
        hasonlydays = []
        for key, sim  in similar.items():
            sim.hasonlydays = []
            for group in sim.groups:
                for month in group.hasonlydays:
                    if month not in sim.hasonlydays:
                        sim.hasonlydays += [ month ]
                    if month not in hasonlydays:
                        hasonlydays += [ month ]
        for key, sim  in similar.items():
            recurring = None
            for group in sim.groups:
                group.deleted = False
                group.recurring = False
                keep = False
                if group.hasonlydays:
                    keep = True
                for item in group.items:
                    for month in item.months:
                        if month in hasonlydays:
                            keep = True
                if not keep:
                    if not recurring:
                        recurring = group
                        group.recurring = True
                    else:
                        group.deleted = True
            for group in sim.groups:
                months = [ month for month in xrange(1,13) if month not in hasonlydays ]
                for item in group.items:
                    if group.recurring:
                        item.onlyday = None
                        item.months = months
                self.make_cronmonths(group)
        newplan = RecorderGroupPlan()
        for group in plan.groups():
            if group.deleted: continue
            newplan.addgroup(group)
        return newplan
    def plan3(self, req, entries):
        """ main entry point """
        self.logg.info("plan3")
        timelist = list(self.recordinglist_to_recordertimelist(entries))
        old_deleted = 0
        for round in xrange(2):
            timelist = sorted(timelist, key = lambda x: x.datetimeX )
            self.adjust_recordertimelist(req, timelist)
            deleted = [ elem for elem in timelist if elem.deleted ]
            new_deleted = len(deleted)
            if old_deleted < new_deleted:
                old_deleted = new_deleted
                continue
        timelist = sorted(timelist, key = lambda x: x.datetimeX )
        plan = RecorderGroupPlan()
        for group in self.timelist_groups(req, timelist):
            plan.addgroup(group)
        if True:
            return self.new_reduce_regular_groups(plan)
        if True:
            return self.reduce_regular_groups(plan)
        return plan
    def plan4(self, req, entries):
        """ main entry point """
        self.logg.info("plan4")
        for elem in entries:
            self.logg.debug("[0] %s", elem)
        timelist = list(self.recordinglist_to_recordertimelist(entries))
        for elem in timelist:
            self.logg.debug("[1] %s", elem)
        self.assign_adapters_for_timelist(timelist)
        old_deleted = 0
        for round in xrange(2):
            timelist = sorted(timelist, key = lambda x: x.datetimeX )
            for adapter in self.adapterlist():
                self.adjust_recordertimelist(req, timelist, adapter)
            deleted = [ elem for elem in timelist if elem.deleted ]
            new_deleted = len(deleted)
            if old_deleted < new_deleted:
                old_deleted = new_deleted
                continue
        for elem in timelist:
            self.logg.debug("[2] %s", elem)
        timelist = sorted(timelist, key = lambda x: x.datetimeX )
        plan = RecorderGroupPlan()
        for adapter in self.adapterlist():
            for group in self.timelist_groups(req, timelist, adapter):
                plan.addgroup(group)
        self.logg.info(" - adapterlist = %s", self.adapterlist())
        for elem in timelist:
            self.logg.debug("[3] %s", elem)
        if True:
            plan.timelist_sort()
            return self.new_reduce_regular_groups(plan)
        else:
            plan.timelist_sort()
            return plan
            
    def plan(self, req, entries):
        if self.algorithm == "plan1":
            return self.plan1(req, entries)
        if self.algorithm == "plan2":
            return self.plan2(req, entries)
        self.set_adapters_from_channels_list(self.channels_list())
        if self.algorithm == "plan3":
            return self.plan3(req, entries)
        if self.algorithm == "plan4":
            return self.plan4(req, entries)
        #else:
        return self.plan4(req, entries)

def deltaM(td):
    return td.seconds / 60 + (td.days * 24 * 60)

def MMMtoHHMM(mmm):
    if mmm is None: return ""
    return "%02i:%02i" % (mmm / 60, mmm % 60)
        
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