import datetime
import os.path
import re

import django.db.models
from django.db.models import Min, Max
from django.urls import reverse
from django.http import HttpResponse, HttpResponseRedirect
from django.shortcuts import render
from django.template import Context, loader
from django.template.defaultfilters import slugify
from django.utils import timezone
from django.views.generic.list import ListView

import troggle.core.models as models
import troggle.parsers.logbooks as logbookparsers
from troggle.core.forms import getTripForm  # , get_name, PersonForm
from troggle.core.models import Expedition, Person, PersonExpedition
from troggle.core.models_caves import LogbookEntry, PersonTrip
from troggle.core.models_survex import SurvexBlock
from troggle.helper import login_required_if_public
from troggle.parsers.logbooks import LoadLogbookForExpedition
from troggle.parsers.people import GetPersonExpeditionNameLookup

import troggle.settings as settings

# Django uses Context, not RequestContext when you call render
# to_response. We always want to use RequestContext, so that
# django adds the context from settings.TEMPLATE_CONTEXT_PROCESSORS.
# This way we automatically get necessary settings variables passed
# to each template. So we use a custom method, render_response
# instead of render_to_response. Hopefully future Django releases
# will make this unnecessary.

# from troggle.alwaysUseRequestContext import render_response

# Deprecated in 1.11.29
# @django.db.models.permalink #this allows the nice get_absolute_url syntax we are using

def getNotablePersons():
    notablepersons = []
    for person in Person.objects.all():
            if person.bisnotable():
                notablepersons.append(person)
    return notablepersons


def personindex(request):
    persons = Person.objects.all()
    # From what I can tell, "persons" seems to be the table rows, while "personss" is the table columns. - AC 16 Feb 09
    personss = [ ]
    ncols = 4
    nc = int((len(persons) + ncols - 1) / ncols)
    for i in range(ncols):
        personss.append(persons[i * nc: (i + 1) * nc])
    
    notablepersons = []
    for person in Person.objects.all():
            if person.bisnotable():
                notablepersons.append(person)

    return render(request,'personindex.html', {'persons': persons, 'personss':personss, 'notablepersons':notablepersons})


def expedition(request, expeditionname):
    this_expedition = Expedition.objects.get(year=int(expeditionname))
    expeditions = Expedition.objects.all()
    personexpeditiondays = [ ]
    dateditems = list(this_expedition.logbookentry_set.all()) + list(this_expedition.survexblock_set.all())
    dates = sorted(set([item.date for item in dateditems]))
    for personexpedition in this_expedition.personexpedition_set.all():
        prow = [ ]
        for date in dates:
            pcell = { "persontrips": PersonTrip.objects.filter(personexpedition=personexpedition, 
                                                                logbook_entry__date=date) }
            pcell["survexblocks"] = set(SurvexBlock.objects.filter(survexpersonrole__personexpedition=personexpedition, 
                                                                    date = date))
            prow.append(pcell)
        personexpeditiondays.append({"personexpedition":personexpedition, "personrow":prow})
        
    if "reload" in request.GET:
        LoadLogbookForExpedition(this_expedition)
    return render(request,'expedition.html', {'expedition': this_expedition, 'expeditions':expeditions, 'personexpeditiondays':personexpeditiondays, 'settings':settings, 'dateditems': dateditems })

def get_absolute_url(self):
    return ('expedition', (expedition.year))

# replaced by statistics page
# class ExpeditionListView(ListView): # django thus expects a template called "expedition_list.html" 
# # from the name of the object not the name of the class.
    # model = Expedition


class Expeditions_tsvListView(ListView): 
    """This uses the Django built-in shortcut mechanism 
    It defaults to use a template with name <app-label>/<model-name>_list.html.
    https://www.agiliq.com/blog/2017/12/when-and-how-use-django-listview/
    https://developer.mozilla.org/en-US/docs/Learn/Server-side/Django/Generic_views
    Either a queryset variable  or set_queryset() function is used, but not needed
    if you want all the obejcts of a particaulr type in which case just set model = <object>
    """
    template_name = 'core/expeditions_tsv_list.html' # if not present then uses core/expedition_list.html 
    #queryset = Expedition.objects.all()
    #context_object_name = 'expedition'
    model = Expedition # equivalent to .objects.all() for a queryset

class Expeditions_jsonListView(ListView): 
    template_name = 'core/expeditions_json_list.html' 
    model = Expedition 


def person(request, first_name='', last_name='', ):
    this_person = Person.objects.get(first_name = first_name, last_name = last_name)
    
    # This is for removing the reference to the user's profile, in case they set it to the wrong person
    if request.method == 'GET':
        if request.GET.get('clear_profile')=='True':
            this_person.user=None
            this_person.save()
            return HttpResponseRedirect(reverse('profiles_select_profile'))
    
    return render(request,'person.html', {'person': this_person, })


def GetPersonChronology(personexpedition):
    '''Horrible bug here whern ther eis more than one survex block per day, it duplicates the entry but gets it wrong
    Fortunately this is just the display on this page which is wroing, no bad calculations get into the database.
    '''
    res = { }
    for persontrip in personexpedition.persontrip_set.all():
        a = res.setdefault(persontrip.logbook_entry.date, { })
        a.setdefault("persontrips", [ ]).append(persontrip)

    for personrole in personexpedition.survexpersonrole_set.all():
        a = res.setdefault(personrole.survexblock.date, { })
        a.setdefault("personroles", [ ]).append(personrole.survexblock)
    
    # build up the tables
    rdates = sorted(list(res.keys()))

    res2 = [ ]
    for rdate in rdates:
        persontrips   = res[rdate].get("persontrips", [])
        personroles   = res[rdate].get("personroles", [])
        for n in range(max(len(persontrips), len(personroles) )):
            res2.append(((n == 0 and rdate or "--"), (n < len(persontrips) and persontrips[n]), (n < len(personroles) and personroles[n]) ))
            
    return res2


def personexpedition(request, first_name='',  last_name='', year=''):
    person = Person.objects.get(first_name = first_name, last_name = last_name)
    this_expedition = Expedition.objects.get(year=year)
    personexpedition = person.personexpedition_set.get(expedition=this_expedition)
    personchronology = GetPersonChronology(personexpedition)
    return render(request,'personexpedition.html', {'personexpedition': personexpedition, 'personchronology':personchronology})


def logbookentry(request, date, slug):
    this_logbookentry = LogbookEntry.objects.filter(date=date, slug=slug)

    if len(this_logbookentry)>1:
        return render(request, 'object_list.html',{'object_list':this_logbookentry})
    else:
        this_logbookentry=this_logbookentry[0]
        return render(request, 'logbookentry.html', {'logbookentry': this_logbookentry})


def logbookSearch(request, extra):
    query_string = ''
    found_entries = None
    if ('q' in request.GET) and request.GET['q'].strip():
        query_string = request.GET['q']
    entry_query = search.get_query(query_string, ['text','title',])
    found_entries = LogbookEntry.objects.filter(entry_query)

    return render(request,'logbooksearch.html',
                          { 'query_string': query_string, 'found_entries': found_entries, })
                          #context_instance=RequestContext(request))

def personForm(request,pk):
    person=Person.objects.get(pk=pk)
    form=PersonForm(instance=person)
    return render(request,'personform.html', {'form':form,})

# tried to delete all this, and the reference in urls.py, but got impenetrable django error message
# @login_required_if_public
# def newLogbookEntry(request, expeditionyear, pdate = None, pslug = None):
    # expedition = Expedition.objects.get(year=expeditionyear)
    # PersonTripFormSet, TripForm = getTripForm(expedition)
    # if pslug and pdate:
        # previousdate = datetime.date(*[int(x) for x in pdate.split("-")])
        # previouslbe = LogbookEntry.objects.get(slug = pslug, date = previousdate, expedition = expedition)
        # assert previouslbe.filename
    # if request.method == 'POST': # If the form has been submitted...
        # tripForm = TripForm(request.POST) # A form bound to the POST data
        # personTripFormSet = PersonTripFormSet(request.POST)
        # if tripForm.is_valid() and personTripFormSet.is_valid(): # All validation rules pass
            # dateStr = tripForm.cleaned_data["date"].strftime("%Y-%m-%d")
            # directory = os.path.join(settings.EXPOWEB, 
                                    # "years", 
                                    # expedition.year, 
                                    # "autologbook")
            # filename = os.path.join(directory, 
                                    # dateStr + "." + slugify(tripForm.cleaned_data["title"])[:50] + ".html")
            # if not os.path.isdir(directory):
                # os.mkdir(directory)
            # if pslug and pdate:
                # delLogbookEntry(previouslbe)
            # f = open(filename, "w")
            # template = loader.get_template('dataformat/logbookentry.html')
            # context = Context({'trip': tripForm.cleaned_data, 
                               # 'persons': personTripFormSet.cleaned_data,
                               # 'date': dateStr,
                               # 'expeditionyear': expeditionyear})
            # f.write(template.render(context))
            # f.close()
            # print((logbookparsers.parseAutoLogBookEntry(filename)))
            # return HttpResponseRedirect(reverse('expedition', args=[expedition.year])) # Redirect after POST
    # else:
        # if pslug and pdate:
            # if previouslbe.cave:
                # tripForm = TripForm(initial={"date": previousdate,
                                             # "title": previouslbe.title,
                                             # "cave": previouslbe.cave.reference(),
                                             # "location": None,
                                             # "caveOrLocation": "cave",
                                             # "html": previouslbe.text})
            # else:
                # tripForm = TripForm(initial={"date": previousdate,
                                             # "title": previouslbe.title,
                                             # "cave": None,
                                             # "location": previouslbe.place,
                                             # "caveOrLocation": "location",
                                             # "html": previouslbe.text})
            # personTripFormSet = PersonTripFormSet(initial=[{"name": get_name(py.personexpedition), 
                                                            # "TU": py.time_underground, 
                                                            # "author": py.is_logbook_entry_author}
                                                           # for py in previouslbe.persontrip_set.all()])
        # else:        
            # tripForm = TripForm() # An unbound form
            # personTripFormSet = PersonTripFormSet()

    # return render(request, 'newlogbookentry.html', {
        # 'tripForm': tripForm,
        # 'personTripFormSet': personTripFormSet,

    # })

# @login_required_if_public
# def deleteLogbookEntry(request, expeditionyear, date = None, slug = None):
    # expedition = Expedition.objects.get(year=expeditionyear)
    # previousdate = datetime.date(*[int(x) for x in date.split("-")])
    # previouslbe = LogbookEntry.objects.get(slug = slug, date = previousdate, expedition = expedition)
    # delLogbookEntry(previouslbe)
    # return HttpResponseRedirect(reverse('expedition', args=[expedition.year])) # Redirect after POST

# def delLogbookEntry(lbe):
    # for pt in lbe.persontrip_set.all():
        # pt.delete()
    # lbe.delete()
    # os.remove(lbe.filename)

def get_people(request, expeditionslug):
    exp = Expedition.objects.get(year = expeditionslug)
    return render(request,'options.html', {"items": [(pe.slug, pe.name) for pe in exp.personexpedition_set.all()]})

def get_logbook_entries(request, expeditionslug):
    exp = Expedition.objects.get(year = expeditionslug)
    return render(request,'options.html', {"items": [(le.slug, "%s - %s" % (le.date, le.title)) for le in exp.logbookentry_set.all()]})