from django.shortcuts import render, redirect, get_object_or_404
from django.contrib.auth import authenticate, login, logout
from django.contrib.auth.decorators import login_required
from django.contrib.auth.forms import UserCreationForm
from django.http import HttpResponseRedirect
from django.urls import reverse
from .models import Post
from .forms import PostForm



def home(request):
    posts = Post.objects.all()
    return render(request, 'blog/home.html', {'posts': posts})

def post_detail(request, pk):
    post = get_object_or_404(Post, pk=pk)
    return render(request, 'blog/post_detail.html', {'post': post})

def login_view(request):
    if request.method == 'POST':
        username = request.POST['username']
        password = request.POST['password']
        user = authenticate(request, username=username, password=password)
        if user is not None:
            login(request, user)
            return redirect('dashboard')
        else:
            return render(request, 'blog/login.html', {'error': 'Invalid credentials'})
    return render(request, 'blog/login.html')

def logout_view(request):
    logout(request)
    return redirect('home')

@login_required
def dashboard(request):
    posts = Post.objects.filter(author=request.user)
    return render(request, 'blog/dashboard.html', {'posts': posts})

def register(request):
    if request.method == 'POST':
        form = UserCreationForm(request.POST)
        if form.is_valid():
            form.save()
            return redirect('login')
    else:
        form = UserCreationForm()
    return render(request, 'blog/register.html', {'form': form})


@login_required
def add_post(request):
    if request.method == 'POST':
        form = PostForm(request.POST)
        if form.is_valid():
            post = form.save(commit=False)
            post.author = request.user
            post.save()
            return redirect('dashboard')
    else:
        form = PostForm()
    return render(request, 'blog/dashboard.html', {'form': form})

@login_required
def edit_post(request, pk):
    post = get_object_or_404(Post, pk=pk, author=request.user)
    if request.method == 'POST':
        form = PostForm(request.POST, instance=post)
        if form.is_valid():
            form.save()
            return redirect('dashboard')
    else:
        form = PostForm(instance=post)
    return render(request, 'blog/edit_post.html', {'form': form, 'post': post})

@login_required
def delete_post(request, pk):
    post = get_object_or_404(Post, pk=pk, author=request.user)
    post.delete()
    return redirect('dashboard')