import string
import os
import datetime
import logging
import re
from subprocess import call

from urllib.parse import urljoin
from decimal import Decimal, getcontext
getcontext().prec=2 #use 2 significant figures for decimal calculations

import settings

from django.db import models
from django.contrib import admin
from django.contrib.auth.models import User
from django.contrib.contenttypes.models import ContentType
#from django.db.models import Min, Max
from django.conf import settings
from django.core.urlresolvers import reverse
from django.template import Context, loader

import troggle.core.models_survex 

def get_related_by_wikilinks(wiki_text):
    found=re.findall(settings.QM_PATTERN,wiki_text)
    res=[]
    for wikilink in found:
        qmdict={'urlroot':settings.URL_ROOT,'cave':wikilink[2],'year':wikilink[1],'number':wikilink[3]}
        try:
            cave_slugs = models_caves.CaveSlug.objects.filter(cave__kataster_number = qmdict['cave'])
            qm=QM.objects.get(found_by__cave_slug__in = cave_slugs,
                              found_by__date__year = qmdict['year'],
                              number = qmdict['number'])
            res.append(qm)         
        except QM.DoesNotExist:
            print(('fail on '+str(wikilink)))
    
    return res

try:
      logging.basicConfig(level=logging.DEBUG,
                           filename=settings.LOGFILE,
                           filemode='w')
except:
# Opening of file for writing is going to fail currently, so decide it doesn't matter for now    
      pass

#This class is for adding fields and methods which all of our models will have.
class TroggleModel(models.Model):
    new_since_parsing = models.BooleanField(default=False, editable=False)
    non_public = models.BooleanField(default=False)
    def object_name(self):
        return self._meta.object_name

    def get_admin_url(self):
        return urllib.parse.urljoin(settings.URL_ROOT, "/admin/core/" + self.object_name().lower() + "/" + str(self.pk))

    class Meta:
        abstract = True

class TroggleImageModel(models.Model):
    new_since_parsing = models.BooleanField(default=False, editable=False)
    
    def object_name(self):
        return self._meta.object_name

    def get_admin_url(self):
        return urllib.parse.urljoin(settings.URL_ROOT, "/admin/core/" + self.object_name().lower() + "/" + str(self.pk))

    class Meta:
        abstract = True

class DataIssue(TroggleModel):
    date = models.DateTimeField(auto_now_add=True, blank=True)
    parser = models.CharField(max_length=50, blank=True, null=True)
    message = models.CharField(max_length=400, blank=True, null=True)

    class Meta:
        ordering = ['date']

    def __str__(self):
        return "%s - %s" % (self.parser, self.message)

# 
# single Expedition, usually seen by year
#
class Expedition(TroggleModel):
    year        = models.CharField(max_length=20, unique=True)
    name        = models.CharField(max_length=100)
        
    def __str__(self):
        return self.year

    class Meta:
        ordering = ('-year',)
        get_latest_by = 'year'
    
    def get_absolute_url(self):
        return urllib.parse.urljoin(settings.URL_ROOT, reverse('expedition', args=[self.year]))
    
    # construction function.  should be moved out
    def get_expedition_day(self, date):
        expeditiondays = self.expeditionday_set.filter(date=date)
        if expeditiondays:
            assert len(expeditiondays) == 1
            return expeditiondays[0]
        res = ExpeditionDay(expedition=self, date=date)
        res.save()
        return res
        
    def day_min(self):
        res = self.expeditionday_set.all()
        return res and res[0] or None
    
    def day_max(self):
        res = self.expeditionday_set.all()
        return res and res[len(res) - 1] or None

class ExpeditionDay(TroggleModel):
    expedition  = models.ForeignKey("Expedition")
    date        = models.DateField()

    class Meta:
        ordering = ('date',)

    def GetPersonTrip(self, personexpedition):
        personexpeditions = self.persontrip_set.filter(expeditionday=self)
        return personexpeditions and personexpeditions[0] or None

class Person(TroggleModel):
    """single Person, can go on many years
    """
    first_name  = models.CharField(max_length=100)
    last_name   = models.CharField(max_length=100)
    fullname    = models.CharField(max_length=200)
    is_vfho     = models.BooleanField(help_text="VFHO is the Vereines für Höhlenkunde in Obersteier, a nearby Austrian caving club.", default=False)
    mug_shot    = models.CharField(max_length=100, blank=True,null=True)
    blurb = models.TextField(blank=True,null=True)
    
    #href        = models.CharField(max_length=200)
    orderref    = models.CharField(max_length=200)  # for alphabetic 
    user	= models.OneToOneField(User, null=True, blank=True)
    def get_absolute_url(self):
        return urllib.parse.urljoin(settings.URL_ROOT,reverse('person',kwargs={'first_name':self.first_name,'last_name':self.last_name}))

    class Meta:
        verbose_name_plural = "People"
        ordering = ('orderref',)  # "Wookey" makes too complex for: ('last_name', 'first_name') 
    
    def __str__(self):
        if self.last_name:
            return "%s %s" % (self.first_name, self.last_name)
        return self.first_name


    def notability(self):
        notability = Decimal(0)
        max_expo_val = 0

        max_expo_year = Expedition.objects.all().aggregate(Max('year'))
        max_expo_val = int(max_expo_year['year__max']) + 1

        for personexpedition in self.personexpedition_set.all():
             if not personexpedition.is_guest:
                print((personexpedition.expedition.year))
                notability += Decimal(1) / (max_expo_val - int(personexpedition.expedition.year))
        return notability

    def bisnotable(self):
        return self.notability() > Decimal(1)/Decimal(3)
    
    def surveyedleglength(self):
        return sum([personexpedition.surveyedleglength()  for personexpedition in self.personexpedition_set.all()])
    
    def first(self):
        return self.personexpedition_set.order_by('-expedition')[0]
    def last(self):
        return self.personexpedition_set.order_by('expedition')[0]

class PersonExpedition(TroggleModel):
    """Person's attendance to one Expo
    """
    expedition  = models.ForeignKey(Expedition)
    person      = models.ForeignKey(Person)
    slugfield   = models.SlugField(max_length=50,blank=True,null=True)
    
    is_guest    = models.BooleanField(default=False)  
    COMMITTEE_CHOICES = (
        ('leader','Expo leader'),
        ('medical','Expo medical officer'),
        ('treasurer','Expo treasurer'),
        ('sponsorship','Expo sponsorship coordinator'),
        ('research','Expo research coordinator'),
        )
    expo_committee_position = models.CharField(blank=True,null=True,choices=COMMITTEE_CHOICES,max_length=200)
    nickname    = models.CharField(max_length=100,blank=True,null=True)
    
    def GetPersonroles(self):
        res = [ ]
        for personrole in self.personrole_set.order_by('survexblock'):
            if res and res[-1]['survexpath'] == personrole.survexblock.survexpath:
                res[-1]['roles'] += ", " + str(personrole.role)
            else:
                res.append({'date':personrole.survexblock.date, 'survexpath':personrole.survexblock.survexpath, 'roles':str(personrole.role)})
        return res

    class Meta:
        ordering = ('-expedition',)
        #order_with_respect_to = 'expedition'

    def __str__(self):
        return "%s: (%s)" % (self.person, self.expedition)
    
    #why is the below a function in personexpedition, rather than in person? - AC 14 Feb 09
    def name(self):
        if self.nickname:
            return "%s (%s) %s" % (self.person.first_name, self.nickname, self.person.last_name)
        if self.person.last_name:
            return "%s %s" % (self.person.first_name, self.person.last_name)
        return self.person.first_name

    def get_absolute_url(self):
        return urllib.parse.urljoin(settings.URL_ROOT, reverse('personexpedition',kwargs={'first_name':self.person.first_name,'last_name':self.person.last_name,'year':self.expedition.year}))
	
    def surveyedleglength(self):
        survexblocks = [personrole.survexblock  for personrole in self.personrole_set.all() ]
        return sum([survexblock.totalleglength  for survexblock in set(survexblocks)])
    
    # would prefer to return actual person trips so we could link to first and last ones
    def day_min(self):
        res = self.persontrip_set.aggregate(day_min=Min("expeditionday__date"))
        return res["day_min"]

    def day_max(self):
        res = self.persontrip_set.all().aggregate(day_max=Max("expeditionday__date"))
        return res["day_max"]


class LogbookEntry(TroggleModel):
    """Single parsed entry from Logbook
    """
    LOGBOOK_ENTRY_TYPES = (
        ("wiki", "Wiki style logbook"),
        ("html", "Html style logbook")
    )

    date    = models.DateField()#MJG wants to turn this into a datetime such that multiple Logbook entries on the same day can be ordered.ld()
    expeditionday = models.ForeignKey("ExpeditionDay", null=True)#MJG wants to KILL THIS (redundant information)
    expedition  = models.ForeignKey(Expedition,blank=True,null=True)  # yes this is double-
    title      = models.CharField(max_length=settings.MAX_LOGBOOK_ENTRY_TITLE_LENGTH)
    cave_slug  = models.SlugField(max_length=50)
    place      = models.CharField(max_length=100,blank=True,null=True,help_text="Only use this if you haven't chosen a cave")
    text       = models.TextField()
    slug       = models.SlugField(max_length=50)
    filename   = models.CharField(max_length=200,null=True)
    entry_type = models.CharField(default="wiki",null=True,choices=LOGBOOK_ENTRY_TYPES,max_length=50)

    class Meta:
        verbose_name_plural = "Logbook Entries"
        # several PersonTrips point in to this object
        ordering = ('-date',)
        
    def __getattribute__(self, item):
        if item == "cave":  
            #Allow a logbookentries cave to be directly accessed despite not having a proper foreignkey
            return models_caves.CaveSlug.objects.get(slug = self.cave_slug).cave
        # parse error in python3.8
        # https://stackoverflow.com/questions/41343263/provide-classcell-example-for-python-3-6-metaclass
        #https://github.com/django/django/pull/7653
        #return TroggleModel.__getattribute__(item) 
        #return super(LogbookEntry, self).__getattribute__(item) # works in py3.5, fails in 3.8
        return TroggleModel.__getattribute__(self,item) # works in py 3.5 AND in 3.8

    def __init__(self, *args, **kwargs):
        if "cave" in list(kwargs.keys()):
            if kwargs["cave"] is not None:
                kwargs["cave_slug"] = models_caves.CaveSlug.objects.get(cave=kwargs["cave"], primary=True).slug
            kwargs.pop("cave")
        # parse error in python3.8        
        return TroggleModel.__init__(self, *args, **kwargs) # seems OK in 3.5 & 3.8! failure later elsewhere with 3.8
        #return TroggleModel().__init__(self, *args, **kwargs) # parses OK, fails at runtime in 3.8
        #return super().__init__(self, *args, **kwargs) # fails in 3.8
        #return super().__init__(*args, **kwargs) # works in py3.5 fails in 3.8
        #return super(LogbookEntry, self).__init__(*args, **kwargs) # works in py3.5
        #return TroggleModel.__init__(*args, **kwargs) # fails in py3.5, runtime fail in 3.8

    def isLogbookEntry(self): # Function used in templates
        return True

    def get_absolute_url(self):
        return urllib.parse.urljoin(settings.URL_ROOT, reverse('logbookentry',kwargs={'date':self.date,'slug':self.slug}))

    def __str__(self):
        return "%s: (%s)" % (self.date, self.title)

    def get_next_by_id(self):
        LogbookEntry.objects.get(id=self.id+1)

    def get_previous_by_id(self):
        LogbookEntry.objects.get(id=self.id-1)

    def new_QM_number(self):
        """Returns  """
        if self.cave:
            nextQMnumber=self.cave.new_QM_number(self.date.year)
        else:
            return None
        return nextQMnumber

    def new_QM_found_link(self):
        """Produces a link to a new QM with the next number filled in and this LogbookEntry set as 'found by' """
        return settings.URL_ROOT + r'/admin/core/qm/add/?' + r'found_by=' + str(self.pk) +'&number=' + str(self.new_QM_number())

    def DayIndex(self):
        return list(self.expeditionday.logbookentry_set.all()).index(self)


#
# Single Person going on a trip, which may or may not be written up (accounts for different T/U for people in same logbook entry)
#
class PersonTrip(TroggleModel):
    personexpedition = models.ForeignKey("PersonExpedition",null=True)
    
    #expeditionday    = models.ForeignKey("ExpeditionDay")#MJG wants to KILL THIS (redundant information)
    #date             = models.DateField() #MJG wants to KILL THIS (redundant information)
    time_underground = models.FloatField(help_text="In decimal hours")
    logbook_entry    = models.ForeignKey(LogbookEntry)
    is_logbook_entry_author = models.BooleanField(default=False)
    
    
    # sequencing by person (difficult to solve locally)
    #persontrip_next  = models.ForeignKey('PersonTrip', related_name='pnext', blank=True,null=True)#MJG wants to KILL THIS (and use funstion persontrip_next_auto)
    #persontrip_prev  = models.ForeignKey('PersonTrip', related_name='pprev', blank=True,null=True)#MJG wants to KILL THIS(and use funstion persontrip_prev_auto)
    
    def persontrip_next(self):
        futurePTs = PersonTrip.objects.filter(personexpedition = self.personexpedition, logbook_entry__date__gt = self.logbook_entry.date).order_by('logbook_entry__date').all()
        if len(futurePTs) > 0:
            return futurePTs[0]
        else:
            return None

    def persontrip_prev(self):
        pastPTs = PersonTrip.objects.filter(personexpedition = self.personexpedition, logbook_entry__date__lt = self.logbook_entry.date).order_by('-logbook_entry__date').all()
        if len(pastPTs) > 0:
            return pastPTs[0]
        else:
            return None

    def place(self):
        return self.logbook_entry.cave and self.logbook_entry.cave or self.logbook_entry.place

    def __str__(self):
        return "%s (%s)" % (self.personexpedition, self.logbook_entry.date)