from rest_framework import status
from rest_framework.decorators import api_view, permission_classes
from rest_framework.response import Response
from crm.permissions import IsCRMAdmin
from seller_models.models import SupplierProfile, Product
from crm.models import AuditLog
from crm.serializers import SupplierProfileSerializer, ProductSerializer
from crm.services.whatsapp_service import WhatsAppService
from django.utils import timezone

whatsapp_service = WhatsAppService()

def log_action(admin, action, target_id, details):
    AuditLog.objects.create(
        admin=admin,
        action=action,
        target_type='seller',
        target_id=target_id,
        details=details
    )

@api_view(['GET'])
@permission_classes([IsCRMAdmin])
def list_sellers(request):
    sellers = SupplierProfile.objects.all()
    status_filter = request.query_params.get('status')
    if status_filter:
        sellers = sellers.filter(status=status_filter)
    
    serializer = SupplierProfileSerializer(sellers, many=True)
    return Response(serializer.data)

@api_view(['GET'])
@permission_classes([IsCRMAdmin])
def get_seller_detail(request, pk):
    try:
        seller = SupplierProfile.objects.get(pk=pk)
    except SupplierProfile.DoesNotExist:
        return Response({"detail": "Seller not found"}, status=404)
        
    serializer = SupplierProfileSerializer(seller)
    return Response(serializer.data)

@api_view(['GET'])
@permission_classes([IsCRMAdmin])
def get_seller_documents(request, pk):
    # Mocking returning presigned document URLs
    docs = [
        {"type": "Aadhar Card", "filename": "aadhar_back_front.pdf", "url": "https://digihox-kyc-bucket.s3.ap-south-2.amazonaws.com/aadhar.pdf?token=presigned123"},
        {"type": "PAN Card", "filename": "pan_card_copy.jpg", "url": "https://digihox-kyc-bucket.s3.ap-south-2.amazonaws.com/pan.jpg?token=presigned123"},
        {"type": "GSTIN Certificate", "filename": "gst_cert_2026.pdf", "url": "https://digihox-kyc-bucket.s3.ap-south-2.amazonaws.com/gst.pdf?token=presigned123"}
    ]
    return Response(docs)

@api_view(['POST'])
@permission_classes([IsCRMAdmin])
def approve_seller(request, pk):
    try:
        seller = SupplierProfile.objects.get(pk=pk)
    except SupplierProfile.DoesNotExist:
        return Response({"detail": "Seller not found"}, status=404)

    old_status = seller.status
    seller.status = 'approved'
    seller.save()

    log_action(request.user, 'approve_seller', seller.id, {"old_status": old_status, "new_status": "approved"})
    whatsapp_service.send_template_alert(seller.phone, "seller_approved", {"name": seller.name})

    return Response({"message": f"Seller {seller.name} approved successfully"})

@api_view(['POST'])
@permission_classes([IsCRMAdmin])
def reject_seller(request, pk):
    reason = request.data.get('reason', 'Documents validation failed')
    try:
        seller = SupplierProfile.objects.get(pk=pk)
    except SupplierProfile.DoesNotExist:
        return Response({"detail": "Seller not found"}, status=404)

    old_status = seller.status
    seller.status = 'rejected'
    seller.save()

    log_action(request.user, 'reject_seller', seller.id, {"old_status": old_status, "new_status": "rejected", "reason": reason})
    whatsapp_service.send_template_alert(seller.phone, "seller_rejected", {"name": seller.name, "reason": reason})

    return Response({"message": f"Seller {seller.name} rejected successfully"})

@api_view(['POST'])
@permission_classes([IsCRMAdmin])
def suspend_seller(request, pk):
    reason = request.data.get('reason', 'Policy violation')
    try:
        seller = SupplierProfile.objects.get(pk=pk)
    except SupplierProfile.DoesNotExist:
        return Response({"detail": "Seller not found"}, status=404)

    old_status = seller.status
    seller.status = 'suspended'
    seller.save()

    log_action(request.user, 'suspend_seller', seller.id, {"old_status": old_status, "new_status": "suspended", "reason": reason})
    whatsapp_service.send_template_alert(seller.phone, "seller_suspended", {"name": seller.name, "reason": reason})

    return Response({"message": f"Seller {seller.name} suspended successfully"})

@api_view(['POST'])
@permission_classes([IsCRMAdmin])
def reinstate_seller(request, pk):
    try:
        seller = SupplierProfile.objects.get(pk=pk)
    except SupplierProfile.DoesNotExist:
        return Response({"detail": "Seller not found"}, status=404)

    old_status = seller.status
    seller.status = 'approved'
    seller.save()

    log_action(request.user, 'reinstate_seller', seller.id, {"old_status": old_status, "new_status": "approved"})
    whatsapp_service.send_template_alert(seller.phone, "seller_reinstated", {"name": seller.name})

    return Response({"message": f"Seller {seller.name} reinstated successfully"})

@api_view(['POST'])
@permission_classes([IsCRMAdmin])
def reset_seller_password(request, pk):
    try:
        seller = SupplierProfile.objects.get(pk=pk)
    except SupplierProfile.DoesNotExist:
        return Response({"detail": "Seller not found"}, status=404)

    # Trigger password reset flow
    whatsapp_service.send_otp(seller.phone, otp_type="password_reset")
    log_action(request.user, 'reset_password', seller.id, {"email": seller.email})

    return Response({"message": "Password reset alert successfully dispatched"})