import logging
import yaml
import os
import json
import time

from django.shortcuts import render, redirect , get_object_or_404
from .forms import OrganizationForm
from .models import Organization,Document, DocumentTemplate, PaymentCode
from backend.accounts.utils import send_confirmation_email, send_document_email
from django.contrib.admin.views.decorators import staff_member_required
from .utils import generate_pdf, generate_risk_graph, generate_residual_risk_graph
from .tables import risk_matrix_table ,get_risk_table, get_safeguard_summary_table
from django.conf import settings
from .processors import render_template
from django.http import JsonResponse, FileResponse, Http404, HttpResponse
from django.core.exceptions import ValidationError
from django.core.validators import validate_email
from django.utils import timezone
from weasyprint import HTML
from django.template.loader import render_to_string
from django.views.decorators.csrf import csrf_exempt


# @login_required
# def index(request):
#     return HttpResponse('<h1>Django</h1><p>Página simples.</p>')

logger = logging.getLogger(__name__)
site_domain = settings.SITE_DOMAIN

# @login_required
def index(request):
    template_name = 'index.html'
    return render(request, template_name)


def signup(request):
    if request.method == 'POST':
        form = OrganizationForm(request.POST)
        if form.is_valid():
            form.save()
            send_confirmation_email(form.data['email'])

            return render(request, 'thankyou.html', {
                'email': form.data['email'],
                })
        else:
            logging.error(form.errors)
            return render(request, 'signup.html', {'form': form})
    else:
        form = OrganizationForm()

    return render(request, 'signup.html', {'form': form})


def validate_form_fields(request):
    name = request.GET.get('name', '').strip()
    email = request.GET.get('email', '').strip()
    errors = {}
    
    if name and Organization.objects.filter(name__iexact=name).exists():
        errors['name'] = 'Organization with this name already exists.'
    if email:
        try:
            validate_email(email)
        except ValidationError:
            errors['email'] = 'Please enter a valid email address.'
        else:
            if Organization.objects.filter(email__iexact=email).exists():
                errors['email'] = 'This email is already registered.'

    return JsonResponse({'errors': errors})


def thankyou(request):
    return render(request, 'thankyou.html')

def document(request, document_id):
    document = get_object_or_404(Document, id=document_id)
    risks_with_controls = get_risk_table(document)
    table_risk_matrix = risk_matrix_table()
    safeguard_summary_table = get_safeguard_summary_table(risks_with_controls)
    graph_base64 = generate_risk_graph(risks_with_controls)
    residual_graph_base64 = generate_residual_risk_graph(risks_with_controls)
    template_obj = get_object_or_404(DocumentTemplate, name="Default Template")
    template_content = template_obj.content 

    try:
        template_segments = yaml.safe_load(template_content)
    except yaml.YAMLError as e:
        return render(request, 'error.html', {'error_message': 'Error parsing template.'})
    context = {
        'document': document,
        'risks_with_controls': risks_with_controls,
        'graph': graph_base64,
        'table_risk_matrix': table_risk_matrix,
        'residual_graph': residual_graph_base64,
        'safeguard_summary_table': safeguard_summary_table,
        'table_risk_matrix_header' : table_risk_matrix[0],
        'table_risk_matrix_rows': table_risk_matrix[1:],
    }
    rendered_content = render_template(template_segments, context)
    return render(request, 'document.html',
                   {'rendered_html': rendered_content,
                    'document': document,})


@staff_member_required
def template_preview(request, name):
    template = get_object_or_404(DocumentTemplate, name=name)
    parsed_template = template.to_dict()
    return render(request, 'template_preview.html', {'template': parsed_template})

def pdf_view(request, document_id):
    document = get_object_or_404(Document, id=document_id)
    return generate_pdf(document)

def payment_page(request):
    error = None
    email = request.GET.get('email')
    if request.method == 'POST':
        import re
        code = re.sub(r'\s+', '', request.POST.get('code', '')).upper()[:10]
        try:
            payment_code = PaymentCode.objects.get(code=code)
            if payment_code.used:
                error = "CODE INVALID"
            else:
                org = Organization.objects.filter(email__iexact=email).first()
                payment_code.used = True
                payment_code.used_at = timezone.now()
                payment_code.company = org
                payment_code.save()
                document = Document.objects.get(organization = org)
                url = f"{site_domain}/pdf/{document.id}/"
                send_document_email(email, url, document)
                return redirect(url)
        except PaymentCode.DoesNotExist:
            error = "❌ Invalid code"
    return render(request, 'payment.html', {'error': error})

def no_confidential_data(request):
    return render(request, "no_confidential_data.html")



@staff_member_required
def payment_codes_pdf_view(request):
    filter_by = request.GET.get('filter_by', 'all')
    if filter_by == 'used':
        codes = PaymentCode.objects.filter(used=True)
    elif filter_by == 'available':
        codes = PaymentCode.objects.filter(used=False)
    else:
        codes = PaymentCode.objects.all()
    html_string = render_to_string('payment_code_report.html', {'codes': codes})
    pdf_content = HTML(string=html_string, base_url=request.build_absolute_uri('/')).write_pdf()
    response = HttpResponse(pdf_content, content_type='application/pdf')
    response['Content-Disposition'] = f'inline; filename=payment_codes_{timezone.now().strftime("%Y%m%d_%H%M%S")}.pdf'
    return response

@csrf_exempt
def validate_code(request):
    if request.method == "POST":
        try:
            data = json.loads(request.body)
            code = data.get("code", "").strip().upper()
            from .models import PaymentCode
            valid = PaymentCode.objects.filter(code=code, used=False).exists()
            time.sleep(3)
            return JsonResponse({"valid": valid})
        except Exception:
            return JsonResponse({"valid": False})
    return JsonResponse({"valid": False})