import json
import time
from pathlib import Path
from django.http import StreamingHttpResponse, JsonResponse
from django.conf import settings
from django.views.decorators.clickjacking import xframe_options_exempt
from django.views.decorators.csrf import csrf_exempt


def send_progress_update(step, message, progress):
    """Helper to send a progress update as JSON"""
    return json.dumps({"step": step, "message": message, "progress": progress}) + "\n"


@xframe_options_exempt
@csrf_exempt
def submit_quote(request):
    """
    Handle quote submission with progress updates.
    Steps:
    1. Upload files
    2. Save files
    3. Send email
    4. Verify email sent
    """
    if request.method != "POST":
        return JsonResponse({"error": "Method not allowed"}, status=405)

    # Read form data first (files need to be read from request)
    email = request.POST.get("email", "").strip()
    notes = request.POST.get("notes", "").strip()
    files = request.FILES.getlist("files")

    def process_quote():
        try:
            if not settings.DEBUG:
                raise Exception("Not implemented")

            # Step 1: Upload files
            yield send_progress_update(1, "Uploading files...", 25)
            # Files are already uploaded at this point, just acknowledge
            uploaded_files = []
            for file in files:
                uploaded_files.append({"name": file.name, "size": file.size})

            # Step 2: Save files
            yield send_progress_update(2, "Saving files...", 50)
            # Save files to disk/storage
            saved_paths = []
            for file in files:
                # Create store directory if it doesn't exist
                store_dir = Path(settings.MEDIA_ROOT) / "uploads"
                store_dir.mkdir(parents=True, exist_ok=True)

                # Save file
                file_path = store_dir / file.name
                with open(file_path, "wb") as f:
                    for chunk in file.chunks():
                        f.write(chunk)
                saved_paths.append(str(file_path))

            # Step 3: Send emails
            yield send_progress_update(3, "Sending emails 1/2...", 70)
            time.sleep(0.5)
            # TODO: Actually send emails
            yield send_progress_update(4, "Sending emails 2/2...", 75)
            time.sleep(0.5)
            # TODO: Actually send emails
            emails_sent = True  # Placeholder

            # Complete
            yield send_progress_update(
                5,
                "Quote request submitted successfully! Check your email for confirmation.",
                100,
            )

        except Exception as e:
            yield send_progress_update("error", f"An error occurred: {str(e)}", 0)

    response = StreamingHttpResponse(process_quote(), content_type="text/event-stream")
    response["Cache-Control"] = "no-cache"
    response["X-Accel-Buffering"] = "no"
    return response