from datetime import datetime

from django.contrib.auth import logout, login, update_session_auth_hash
from django.contrib.auth.decorators import login_required
from django.contrib.auth.forms import PasswordChangeForm
from django.contrib.auth.models import User
from django.shortcuts import render, get_object_or_404, redirect

from main.forms import StoryForm, EpicForm, RegisterForm, ProfileForm
from main.models import Story, Epic, Sprint


@login_required
def index(request):
    today = datetime.today()
    try:
        current_sprint = Sprint.objects.filter(date_start__lte = today).filter(date_end__gt=today)[0]
    except IndexError:
        current_sprint = None
    
    epics = Epic.objects.filter(closed=False)
    return render(request, 'index.html', {'current_sprint': current_sprint, 'epics': epics})

def register(request):
    if request.method == 'POST':
        form = RegisterForm(request.POST)
        if form.is_valid():
            user = form.save()
            login(request, user)
            return redirect("index")
    else:
        form = RegisterForm()
    return render(request, 'registration/register.html', {'form': form})

def profile_update(request):
    if request.method == 'POST':
        user = get_object_or_404(User, username=request.user)
        form = ProfileForm(request.POST, instance=user)
        if form.is_valid():
            user = form.save()
            login(request, user)
            return redirect("index")
    else:
        user = get_object_or_404(User, username=request.user)
        form = ProfileForm(instance=user)
    return render(request, 'registration/register.html', {'form': form})

def change_password(request):
    if request.method == 'POST':
        form = PasswordChangeForm(request.user, request.POST)
        if form.is_valid():
            user = form.save()
            update_session_auth_hash(request, user)  # Important!
            return redirect('index')
    else:
        form = PasswordChangeForm(request.user)
    return render(request, 'registration/change_password.html', {'form': form})


@login_required
def logout(request):
    logout(request)
    return redirect("index")


@login_required
def story_index(request):
    
    sprints = Sprint.objects.all()
    users = User.objects.all()
    
    stories = Story.objects

    filters = request.GET
    if 'state' in filters and filters['state']:
        stories = stories.filter(closed=(filters['state'] == 'closed'))
    if 'sprint' in filters and filters['sprint']:
        stories = stories.filter(sprints__id=filters['sprint'])
    if 'author' in filters and filters['author']:
        stories = stories.filter(author_id=filters['author'])
    if 'assignee' in filters and filters['assignee']:
        stories = stories.filter(assignees__id=filters['assignee'])
    
    return render(request, 'story_index.html', {'stories': stories.all(), 'sprints': sprints, 'users': users})

@login_required
def story_details(request, story_id):
    story = get_object_or_404(Story, id=story_id)
    return render(request, 'story_details.html', {'story': story})

@login_required
def story_create(request, epic_id):
    if request.method == 'POST':
        
        form = StoryForm(request.POST)
        if form.is_valid():
            story = form.save(commit=False)
            story.author = User.objects.get(username=request.user)
            story.save()
            return redirect("story_details", story.id)
        
    else:
        story = Story()
        story.epic = get_object_or_404(Epic, id=epic_id)
        form = StoryForm(instance=story)
         
    return render(request, 'story_form.html', {'form': form})

@login_required
def story_edit(request, story_id):
    if request.method == 'POST':
        story = get_object_or_404(Story, id=story_id)
        form = StoryForm(request.POST, instance=story)
        if form.is_valid():
            form.save()
            return redirect("story_details", story.id)
        
    else:
        story = get_object_or_404(Story, id=story_id)
        form = StoryForm(instance=story)
        
    return render(request, 'story_form.html', {'form': form})

@login_required
def story_delete(request, story_id):
    if request.method == 'POST':
        story = get_object_or_404(Story, id=story_id)
        story.delete()
        return redirect("index")
    else:
        story = get_object_or_404(Story, id=story_id)
        return render(request, 'deletion.html', {'object': story})
    
def story_close(request, story_id):
    story = get_object_or_404(Story, id=story_id)
    story.closed = True
    story.save()
    return render(request, 'epic_details.html', {'epic': story.epic})

def story_reopen(request, story_id):
    story = get_object_or_404(Story, id=story_id)
    story.closed = False
    story.save()
    return render(request, 'story_details.html', {'story': story})

def epic_details(request, epic_id):
    epic = get_object_or_404(Epic, id=epic_id)
    return render(request, 'epic_details.html', {'epic': epic})

def epic_create(request):
    if request.method == 'POST':
        
        form = EpicForm(request.POST)
        if form.is_valid():
            epic = form.save(commit=False)
            epic.author = User.objects.get(username=request.user)
            epic.save()
            return redirect("epic_details", epic.id)
        
    else:
        form = EpicForm()
         
    return render(request, 'epic_form.html', {'form': form})

@login_required
def epic_edit(request, epic_id):
    if request.method == 'POST':
        epic = get_object_or_404(Epic, id=epic_id)
        form = EpicForm(request.POST, instance=epic)
        if form.is_valid():
            form.save()
            return redirect("epic_details", epic.id)
        
    else:
        epic = get_object_or_404(Epic, id=epic_id)
        form = EpicForm(instance=epic)
        
    return render(request, 'epic_form.html', {'form': form})

@login_required
def epic_delete(request, epic_id):
    if request.method == 'POST':
        epic = Epic.objects.get(id=epic_id)
        epic.delete()
        return redirect("index")
    else:
        epic = Epic.objects.get(id=epic_id)
        return render(request, 'deletion.html', {'object': epic})