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scheduler.py
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scheduler.py
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import sys
import json
import datetime
##=======================================================================
##=======================================================================
class Date :
def __init__ (self, key, val):
self._key = int (key)
self._val = val
[mon,day] = [ int (i) for i in val.split (".") ]
year = 2012
self._date = datetime.date (2012, mon, day)
self._taken = False
def name (self) : return self._val
def key (self):
return self._key
def __str__ (self):
return "Date %d: %s" % (self._key, self._val)
def is_adjacent (self, d2):
delta = self._date - d2._date
return (abs(delta.days) <= 1)
##=======================================================================
class Person :
def __init__ (self, key, val, schedule):
self._key = int (key)
self._name = val['name']
self._date_list = [ schedule._dates[d] for d in val['dates'] ]
self._date_set = set( [ d._key for d in self._date_list ] )
def name (self) : return self._name
##=======================================================================
class Director (Person):
def __init__ (self, key, val, schedule):
Person.__init__ (self, key, val, schedule)
self._num_gigs = 0
def __str__ (self):
return "Director %d: %s" % (self._key, self._name)
##=======================================================================
class Writer (Person):
def __init__ (self, key, val, schedule):
Person.__init__ (self, key, val, schedule)
l = [ schedule._directors[d] for d in val['directors'] ]
self._director_list = l
self._director_set = set([ d._key for d in l ])
def __str__ (self):
return "Writer %d: %s" % (self._key, self._name)
def output (self):
print " %s --> w/ %s on %s" % \
(self, self._choice[1].name(), self._choice[0].name ())
##=======================================================================
class Schedule:
def __init__ (self):
self._dates = {}
self._writers = {}
self._directors = {}
def load_from_json (self, js):
for k,v in js['dates'].items():
self._dates[int(k)] = Date (k, v)
for k,v in js['directors'].items():
self._directors[int(k)] = Director (k, v, self)
for k,v in js['writers'].items():
self._writers[int(k)] = Writer (k, v, self)
def schedule (self) :
writers = self._writers.values()
res = self._schedule(writers[0], writers[1:])
if not res:
raise Exception ("no schedules worked!")
def _schedule(self, w, rest):
print "+ Schedule %s @ length %d" % (w, len (rest))
for date in w._date_list:
print "++ Try date %s" % date
prev = self._dates.get (date._key - 1)
if date._taken:
print "+++ is taken...."
elif prev and date.is_adjacent (prev) and prev._taken :
print "+++ is next to a taken date %s" % prev
else :
date._taken = True
for director in w._director_list:
if director._num_gigs < 2 and \
date._key in director._date_set:
print "+++ Try director %s" % director
director._num_gigs += 1
w._choice = [ date, director ]
if len (rest) == 0 or \
self._schedule (rest[0], rest[1:]) :
return True
else:
director._num_gigs -= 1
w._choice = None
date._taken = False
return False
def output (self):
print "Schedule ===================================="
wl = self._writers.values()
wl.sort (key = lambda x : x._choice[0]._date)
for w in wl:
w.output()
##=======================================================================
def main (argv):
try:
inf = argv[1]
inh = open (inf, "r")
line = inh.readlines()
raw = ''.join (line)
dat = json.loads (raw)
schedule = Schedule ()
schedule.load_from_json (dat)
schedule.schedule()
schedule.output()
except IndexError, e:
print "usage: %s <input-file>" % argv[0]
except IOError, e:
print "Cannot open input file %s: %s" % (inf, e)
except ValueError, e:
print "Could not decode json: %s" % e
##=======================================================================
main (sys.argv)