from django.shortcuts import render, HttpResponse, get_object_or_404, Http404, redirect
from .models import resulation
from datetime import datetime
import os, uuid
import misdghs.settings
from django.http import FileResponse, StreamingHttpResponse
from urllib.parse import unquote
from misdghs import settings
from django.core.files.storage import default_storage
from django.shortcuts import render, redirect
from django.urls import reverse_lazy, reverse
from django.contrib.auth.views import LoginView
from django.contrib.auth.models import User
from django.contrib.messages.views import SuccessMessageMixin
from django.views.generic.edit import CreateView
from .models import Verification
from .forms import SignupForm
from django.contrib.auth import authenticate, login, logout
from django.contrib.auth.decorators import login_required
from django.contrib import messages


class SignupView(SuccessMessageMixin, CreateView):
    form_class = SignupForm
    template_name = 'registration/signup.html'
    success_url = reverse_lazy('login')
    success_message = "Registration successful! Please verify your email."
    
    def form_valid(self, form):
        print("=== Checking form validity in SignupView ===")
        
        # Check if the username already exists
        existing_username = User.objects.filter(username=form.cleaned_data['username'])
        if existing_username.exists():
            print(f"Username '{form.cleaned_data['username']}' already exists.")
            form.add_error('username', 'Username already taken.')
            return super().form_invalid(form)
        
        # Check if the email already exists
        existing_email = User.objects.filter(email=form.cleaned_data['email'])
        if existing_email.exists():
            print(f"Email '{form.cleaned_data['email']}' already registered.")
            form.add_error('email', 'Email already registered.')
            return super().form_invalid(form)
        
        # Form is valid, proceed to create user
        print("Form validation passed. Proceeding to create user...")
        response = super().form_valid(form)
        print(f"User created successfully. User object: {self.object}")
        
        # Verify that self.object exists and has the correct fields
        if self.object:
            print(f"New user details - Username: {self.object.username}, Email: {self.object.email}")
            print("Proceeding to send verification email.")
            self.send_verification_email()
        else:
            print("Error: User object is not created after form submission.")
        
        return response
    
    def send_verification_email(self):
        print("\n=== Entering send_verification_email method ===")
        try:
            # Create a new Verification instance
            verification = Verification.objects.create(user=self.object)
            print(f"Verification object created with key: {verification.key}")
            
            # Generate the verification key (you can improve this by using a more secure method)
            import uuid
            key = str(uuid.uuid4())
            print(f"Generated verification key: {key}")
            
            # Prepare email content
            subject = 'Verify your email'
            body = (
                f'Please verify your account by clicking this link: '
                f'{self.request.build_absolute_uri(reverse("verify", kwargs={"key": key}))}'
            )
            html_body = (
                f'<a href="{self.request.build_absolute_uri(reverse("verify", kwargs={"key": key}))}">'
                'Verify Email</a>'
            )
            
            # Send email using Django's send_mail function
            print(f"Attempting to send verification email to: {self.object.email}")
            from django.core.mail import send_mail
            send_mail(
                subject,
                body,
                'dpmehealth@gmail.com',
                [self.object.email],
                fail_silently=False
            )
            print("Verification email sent successfully.")
            
        except Exception as e:
            print(f"Error sending verification email: {str(e)}")
            raise  # Re-raise the exception to see it in logs or handle appropriately
        
    def generate_key(self):
        import uuid
        return str(uuid.uuid4())

def Verify(request, key):
    try:
        print(f"\n=== Verification view called with key: {key} ===")
        verification = Verification.objects.get(key=key)
        if not verification.verified:
            print(f"Verification found and unverified. Proceeding to verify.")
            verification.verified = True
            verification.save()
            user = verification.user
            print(f"User associated with this verification: {user.username}")
            user.is_active = True
            user.save()
            messages.success(request, 'Email verified successfully!')
            return redirect('login')
        else:
            print("Verification link already used.")
            messages.error(request, 'Already verified.')
    except Verification.DoesNotExist:
        print(f"Invalid verification key: {key}")
        messages.error(request, 'Invalid verification link.')
    return redirect('home')


def signin(request):
    if request.method == "POST":
        username = request.POST.get("username")
        password = request.POST.get("password")
        user = authenticate(request, username=username, password=password)
        if user is not None:
            login(request, user)
            messages.success(request, "You have successfully logged in!")
            return redirect("home")
        messages.error(request, "Invalid username or password.")
    else:
        return render(request, "registration/signin.html")

@login_required
def signout(request):
    logout(request)
    messages.info(request, "You have successfully logged out.")
    return redirect("home")




# Create your views here.
def Home(request):
    return render(request,'resulation/home.html')


@login_required
def Savepdf(request):
    if request.method == 'POST':
        try:
            # Get text form fields
            pdftype= request.POST.get('pdftype')
            org_unit = request.POST.get('org_unit')
            topic = request.POST.get('topic')
            tittle = request.POST.get('tittle')
            m_number = request.POST.get('m_number')
            m_date = request.POST.get('m_date')
            m_venue = request.POST.get('m_venue')

            # Get file uploads
            attendance_file = request.FILES.get('attendance_file')
            res_con_mou_file = request.FILES.get('res_con_mou_file')

            # Create a new seminar instance with text fields
            if attendance_file:
                new_filename1 = f"attendance_{uuid.uuid4()}.pdf"
                path1 = os.path.join('media', 'attendance_files', new_filename1)

                with open(path1, 'wb') as destination:
                    for chunk in attendance_file.chunks():
                        destination.write(chunk)

            if res_con_mou_file:
                new_filename2 = f"res_con_{uuid.uuid4()}.pdf"
                path2 = os.path.join('media', 'resolution_files', new_filename2)
                
                print(path2)
                with open(path2, 'wb') as destination:
                    for chunk in res_con_mou_file.chunks():
                        destination.write(chunk)
            seminar = resulation(
                pdftype=pdftype,
                org_unit=org_unit,
                topic=topic,
                tittle=tittle,
                m_number=m_number,
                m_date=m_date,
                m_venue=m_venue,
                attendance_file=new_filename1,
                res_con_mou_file=new_filename2,
            )    
            seminar.save()
            print(path1)
            message = "Data Inserted successfully"
            # Redirect after a successful save
            return render(request, "resulation/home.html", {'message': message})

        except Exception as e:
            # Handle any errors (e.g., invalid file types or sizes)
            print(f"Error processing form: {str(e)}")
            return render(request, 'resulation/resulation.html', {'error': str(e)})

    else:
        # Render the form template
        return render(request, 'resulation/resulation.html')

@login_required
def Viewresulation(request):
    # Get all records from database
    pdf_records = resulation.objects.filter(pdftype='Meeting Minutes').order_by('-m_date')  # Latest first
    return render(request, 'resulation/viewresulation.html', {'pdf_records': pdf_records})

@login_required
def file_download(request, type, filename):
    # Construct the full path to the file
    if type== 'attendance':
        file_path = os.path.join(settings.MEDIA_ROOT, 'attendance_files', filename)
    if type=='resolution':
        file_path = os.path.join(settings.MEDIA_ROOT, 'resolution_files', filename)

    
    # Use sendfile to stream the file directly
    return FileResponse(open(file_path, 'rb'), content_type='application/pdf')


@login_required
def Mou(request):
    if request.method == 'POST':
        try:
            # Get text form fields
            pdftype= request.POST.get('pdftype')
            first_party = request.POST.get('first_party')
            second_party = request.POST.get('second_party')
            contract_mou_date = request.POST.get('contract_mou_date')
            # Get file uploads
            res_con_mou_file = request.FILES.get('res_con_mou_file')

            if res_con_mou_file:
                new_filename2 = f"res_con_{uuid.uuid4()}.pdf"
                path2 = os.path.join('media', 'resolution_files', new_filename2)
                
                print(path2)
                with open(path2, 'wb') as destination:
                    for chunk in res_con_mou_file.chunks():
                        destination.write(chunk)
            seminar = resulation(
                pdftype=pdftype,
                first_party = first_party,
                second_party = second_party,
                contract_mou_date = contract_mou_date,
                res_con_mou_file=new_filename2,
            )    
            seminar.save()
            message = "Data Inserted successfully"
            # Redirect after a successful save
            return render(request, "resulation/home.html", {'message': message})

        except Exception as e:
            # Handle any errors (e.g., invalid file types or sizes)
            print(f"Error processing form: {str(e)}")
            return render(request, 'resulation/mou.html', {'error': str(e)})

    else:
        # Render the form template
        return render(request, 'resulation/mou.html')


@login_required
def Viewmou(request):
    # Get all records from database
    pdf_records = resulation.objects.filter(pdftype='MoU').order_by('-m_date')  # Latest first
    print(pdf_records)
    return render(request, 'resulation/viewmou.html', {'pdf_records': pdf_records})


@login_required
def Contract(request):
    if request.method == 'POST':
        try:
            # Get text form fields
            pdftype= request.POST.get('pdftype')
            contract_name= request.POST.get('topic')
            first_party = request.POST.get('first_party')
            second_party = request.POST.get('second_party')
            contract_mou_date = request.POST.get('contract_mou_date')
            contract_mou_closing_date = request.POST.get('closing_date')
            duration= request.POST.get('duration')
            # Get file uploads
            res_con_mou_file = request.FILES.get('res_con_mou_file')

            if res_con_mou_file:
                new_filename2 = f"res_con_{uuid.uuid4()}.pdf"
                path2 = os.path.join('media', 'resolution_files', new_filename2)
                
                print(path2)
                with open(path2, 'wb') as destination:
                    for chunk in res_con_mou_file.chunks():
                        destination.write(chunk)
            seminar = resulation(
                pdftype=pdftype,
                topic=contract_name,
                first_party = first_party,
                second_party = second_party,
                contract_mou_date = contract_mou_date,
                closing_date= contract_mou_closing_date,
                duration=duration,
                res_con_mou_file=new_filename2,
            )    
            seminar.save()
            message = "Data Inserted successfully"
            # Redirect after a successful save
            return render(request, "resulation/home.html", {'message': message})

        except Exception as e:
            # Handle any errors (e.g., invalid file types or sizes)
            print(f"Error processing form: {str(e)}")
            return render(request, 'resulation/contract.html', {'error': str(e)})

    else:
        # Render the form template
        return render(request, 'resulation/contract.html')


@login_required
def Viewcontract(request):
    # Get all records from database
    pdf_records = resulation.objects.filter(pdftype='Contract').order_by('-m_date')  # Latest first
    return render(request, 'resulation/viewcontract.html', {'pdf_records': pdf_records})