from django.shortcuts import render, redirect
from django.http import HttpResponse
from django.template import loader
from django.core.urlresolvers import reverse
import django.contrib.auth as auth
from django.conf import settings
# Create your views here.
from django.views.generic import TemplateView,ListView
from django.views.generic.detail import DetailView
from django.views.generic.edit import CreateView, UpdateView, DeleteView
from django.core.urlresolvers import reverse_lazy
from dispatch.models import Company, Load, Paperwork
from dispatch.forms import AddPaperworkForm
from django.contrib.auth.models import User
from django.contrib.auth.mixins import UserPassesTestMixin
from django.http import HttpResponseRedirect
from datetime import datetime, timedelta
from django.utils import formats
from dateutil import rrule

def home(request):
    return redirect(reverse('load_list'))

def get_week_dates(date=None):
    week_dates = {}
    if date == None:
        date = formats.date_format(datetime.now(), "SHORT_DATE_FORMAT")
    dt = datetime.strptime(date, '%m/%d/%Y')
    weekday = dt.weekday()
    if weekday == 6:
        week_dates['start_date'] = dt
    else:
        weekday = weekday + 1
        week_dates['start_date'] = dt - timedelta(days=weekday)
    week_dates['end_date'] = week_dates['start_date'] + timedelta(days=6)
    week_dates['next_week'] = week_dates['end_date'] + timedelta(days=1)
    week_dates['previous_week'] = week_dates['start_date'] - timedelta(days=1)
    return week_dates

def split_loads_by_day(loads,start_date,end_date):
    split_loads = {}

    for date in rrule.rrule(rrule.DAILY,dtstart=start_date, until=end_date):
        str_date = formats.date_format(date, "SHORT_DATE_FORMAT")
        if date not in split_loads:
            split_loads[date] = loads.filter(date=date)

    return split_loads

class LoadDateSort(DetailView):
    def get_context_data(self, **kwargs):
        context = super(DetailView, self).get_context_data(**kwargs)
        week_dates  = get_week_dates(self.request.GET.get('date',None))

        loads = self.get_object().load_set.filter(date__range=(week_dates['start_date'],
            week_dates['end_date'])).prefetch_related('company')

        context['loads'] = split_loads_by_day(loads,week_dates['start_date'],
            week_dates['end_date'])

        context['week_dates'] = week_dates

        return context

class FilteredListView(ListView):
    def get_queryset(self):
        base_qs = super(FilteredListView, self).get_queryset()
        if not self.request.user.is_superuser:
            return base_qs.filter(user=self.request.user)
        return base_qs

class FilteredUpdateView(UpdateView):
    def get_queryset(self):
        base_qs = super(FilteredUpdateView, self).get_queryset()
        if not self.request.user.is_superuser:
            return base_qs.filter(user=self.request.user)
        return base_qs

class FilteredDeleteView(DeleteView):
    def get_queryset(self):
        base_qs = super(FilteredDeleteView, self).get_queryset()
        if not self.request.user.is_superuser:
            return base_qs.filter(user=self.request.user)
        return base_qs


# Driver CRUD

class DriverList(UserPassesTestMixin, ListView):
    template_name = "dispatch/drivers/list.html"
    model = User

    def test_func(self):
        return self.request.user.is_superuser

class DriverDetail(UserPassesTestMixin, LoadDateSort):
    template_name = "dispatch/drivers/detail.html"
    model = User

    def test_func(self):
        # Seems a little hacky at first but it works!
        return self.request.user.is_superuser or \
            self.get_object().pk is self.request.user.id

    def get_context_data(self, **kwargs):
        # Shit gets fucky with super() really fast, but this seems to work
        context = super(DriverDetail, self).get_context_data(**kwargs)

        stats = {};
        stats['count'], stats['average'], stats['sum'] = (0,0,0)
        stats['incomplete_loads'] = 0

        loads_by_date = context['loads']
        for d in loads_by_date:
            # Iterate over the array for the given date
            for l in loads_by_date[d]:
                stats['count']  += 1
                stats['sum']    += l.amount
                if l.amount == 0:
                    stats['incomplete_loads'] += 1

        if stats['sum'] is not 0 and stats['count'] is not 0:
            stats['average'] = stats['sum']/stats['count']


        # Add our stats to the context so we can use it in the template
        context['stats'] = stats

        return context

class DriverUpdate(UserPassesTestMixin, UpdateView): 
    template_name = "dispatch/drivers/edit.html"
    model = User
    success_url = reverse_lazy('driver_list')
    fields = ['username', 'first_name','last_name','email','groups', 'is_active']

    def test_func(self):
        # Seems a little hacky at first but it works!
        return self.request.user.is_superuser or \
            self.get_object().pk is self.request.user.id

# Company CRUD

class CompanyList(ListView):
    template_name = "dispatch/companies/list.html"
    model = Company

class CompanyCreate(UserPassesTestMixin, CreateView):
    template_name = "dispatch/companies/create.html"
    model = Company
    success_url = reverse_lazy('company_list')
    fields = ['name', 'address', 'phone_number','email_address']

    def test_func(self):
        return self.request.user.is_superuser

class CompanyDetail(LoadDateSort):
    template_name = "dispatch/companies/detail.html"
    model = Company

class CompanyUpdate(UserPassesTestMixin, UpdateView):
    template_name = "dispatch/companies/edit.html"
    model = Company
    success_url = reverse_lazy('company_list')
    fields = ['name', 'address', 'phone_number','email_address']

    def test_func(self):
        return self.request.user.is_superuser


class CompanyDelete(UserPassesTestMixin, DeleteView):
    template_name = "dispatch/companies/delete.html"
    model = Company
    success_url = reverse_lazy('company_list')

    def test_func(self):
        return self.request.user.is_superuser
# Load CRUD

class LoadList(FilteredListView):
    template_name = "dispatch/loads/list.html"
    model = Load


    def get_queryset(self):
        base_qs = super(LoadList, self).get_queryset()
        wd = get_week_dates(self.request.GET.get('date',None))
        return base_qs.filter(date__range=(wd['start_date'], wd['end_date']))

    def get_context_data(self, **kwargs):
        context = super(LoadList, self).get_context_data(**kwargs)
        wd = get_week_dates(self.request.GET.get('date',None))
        context['week_dates'] = wd

        context['loads'] = split_loads_by_day(self.object_list,wd['start_date'],wd['end_date'])
        return context

class LoadCreate(CreateView):
    template_name = "dispatch/loads/create.html"
    model = Load
    fields = ['date', 'company', 'load_number', 'description', 'delivered_to', 'amount']

    def get(self,request):
        if request.user.is_superuser:
            self.fields.insert(1,'user')
        return super(LoadCreate, self).get(request)

    def form_valid(self, form):
        if not self.request.user.is_superuser:
            load = form.save(commit=False)
            load.user = self.request.user
        return super(LoadCreate, self).form_valid(form)

class LoadDetail(DetailView):
    template_name = "dispatch/loads/detail.html"
    model = Load

    def get_context_data(self, **kwargs):
        context = super(LoadDetail, self).get_context_data(**kwargs)

        context['paperwork_list'] = Paperwork.objects.filter(load=context['object'])

        return context

class LoadUpdate(FilteredUpdateView):
    template_name = "dispatch/loads/edit.html"
    model = Load
    fields = ['date', 'company','load_number','description', 'delivered_to', 'amount']

    def get(self,request,pk):
        if request.user.is_superuser:
            self.fields.insert(1,'user')
        return super(LoadUpdate, self).get(request)

    def form_valid(self, form):
        if not self.request.user.is_superuser:
            load = form.save(commit=False)
            load.user = self.request.user
        return super(LoadUpdate, self).form_valid(form)

class LoadDelete(UserPassesTestMixin, FilteredDeleteView):
    template_name = "dispatch/loads/delete.html"
    model = Load
    success_url = reverse_lazy('load_list')

    def test_func(self):
        return self.request.user.is_superuser


# Paperwork Uploads

def PaperworkUpload(request, load_id):
    l = Load.objects.get(pk=load_id)
    if request.method == 'POST':
        form = AddPaperworkForm(request.POST, request.FILES)
        if form.is_valid():
            pw = form.save(commit=False)
            pw.load = l
            pw.save()
            return redirect(reverse('load_detail', kwargs={'pk': load_id}))
    else:
        form = AddPaperworkForm()

    ctx = { 'form': form, 'load': l }
    return render(request, 'dispatch/paperwork/add.html', ctx)

def PaperworkDelete(request, load_id, pk):
    # TODO: Someday we should return the errors deleting the file, if any
    try:
        p = Paperwork.objects.get(pk=pk)
        p.delete()
    except Exception as e:
        print(e)

    return redirect(reverse('load_detail', kwargs={'pk': load_id}))