DEMO-AGENT/review_agent/views.py

from django.contrib.auth.decorators import login_required
from django.db.models import Count, Q
from django.http import HttpRequest, HttpResponse, JsonResponse, StreamingHttpResponse
from django.shortcuts import redirect, render
from django.views.decorators.http import require_http_methods

from .services import (
    create_conversation,
    get_conversation_for_user,
    list_conversations,
    send_message,
    stream_message,
)
from .models import Conversation, FileAttachment, FileSummaryBatch, RegulatoryReviewBatch, WorkflowNodeRun


@login_required
@require_http_methods(["GET", "POST"])
def workspace(request: HttpRequest) -> HttpResponse:
    """Renders the review-agent workspace and handles conversation actions."""

    if request.method == "POST":
        action = request.POST.get("action")
        conversation = get_conversation_for_user(request.user, request.POST.get("conversation_id"))

        if action == "new_conversation":
            conversation = create_conversation(request.user)
            return redirect(f"/?conversation={conversation.pk}")

        if action == "send_message":
            content = (request.POST.get("prompt") or "").strip()
            if not conversation:
                conversation = create_conversation(request.user)
            if content:
                send_message(conversation, content)
            return redirect(f"/?conversation={conversation.pk}")

    search = (request.GET.get("q") or "").strip()
    conversations = list_conversations(request.user, search)
    current = get_conversation_for_user(request.user, request.GET.get("conversation"))

    if current is None and conversations.exists():
        current = conversations.first()

    workflow_cards = build_workflow_cards(current) if current else []

    return render(
        request,
        "home.html",
        {
            "page_title": "审核智能体",
            "search_query": search,
            "conversations": conversations,
            "current_conversation": current,
            "messages": current.messages.all() if current else [],
            "attachments": FileAttachment.objects.filter(conversation=current).order_by("original_name", "-version_no") if current else [],
            "workflow_cards": workflow_cards,
        },
    )


@login_required
@require_http_methods(["GET"])
def attachment_manager(request: HttpRequest) -> HttpResponse:
    conversations = (
        Conversation.objects.filter(user=request.user)
        .annotate(
            attachment_count=Count(
                "file_attachments",
                filter=~Q(file_attachments__upload_status=FileAttachment.UploadStatus.DELETED),
            )
        )
        .order_by("-updated_at", "-id")
    )
    selected = get_conversation_for_user(request.user, request.GET.get("conversation"))
    attachments = (
        FileAttachment.objects.filter(conversation=selected)
        .order_by("original_name", "-version_no")
        if selected
        else []
    )
    return render(
        request,
        "attachment_manager.html",
        {
            "page_title": "附件管理",
            "conversations": conversations,
            "selected_conversation": selected,
            "attachments": attachments,
        },
    )


@login_required
@require_http_methods(["POST"])
def stream_chat(request: HttpRequest) -> HttpResponse:
    """Streams one assistant reply so the UI can render incremental output."""

    content = (request.POST.get("prompt") or "").strip()
    if not content:
        return JsonResponse({"error": "消息内容不能为空。"}, status=400)

    conversation = get_conversation_for_user(request.user, request.POST.get("conversation_id"))
    if not conversation:
        conversation = create_conversation(request.user)

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


def build_workflow_cards(conversation: Conversation) -> list[dict[str, object]]:
    cards: list[dict[str, object]] = []
    for batch in FileSummaryBatch.objects.filter(conversation=conversation).prefetch_related("node_runs"):
        cards.append(
            {
                "id": batch.pk,
                "workflow_type": "file_summary",
                "batch_no": batch.batch_no,
                "status": batch.status,
                "error_message": batch.error_message,
                "risk_label": "",
                "created_at": batch.created_at,
                "nodes": list(batch.node_runs.order_by("id")),
            }
        )
    regulatory_batches = RegulatoryReviewBatch.objects.filter(conversation=conversation)
    for batch in regulatory_batches:
        cards.append(
            {
                "id": batch.pk,
                "workflow_type": "regulatory_review",
                "batch_no": batch.batch_no,
                "status": batch.status,
                "error_message": batch.error_message,
                "risk_label": _format_risk_label(batch.risk_summary or {}),
                "condition_json": batch.condition_json or {},
                "condition_candidates": (batch.condition_json or {}).get("candidates") or {},
                "notification_count": batch.notifications.count(),
                "review_record_count": batch.artifacts.filter(metadata__artifact="review_record").count(),
                "created_at": batch.created_at,
                "nodes": list(
                    WorkflowNodeRun.objects.filter(
                        workflow_type="regulatory_review",
                        workflow_batch_id=batch.pk,
                    ).order_by("id")
                ),
            }
        )
    return sorted(cards, key=lambda item: item["created_at"], reverse=True)[:5]


def _format_risk_label(risk_summary: dict) -> str:
    parts = []
    labels = [
        ("blocking", "阻断项"),
        ("high", "高风险"),
        ("medium", "中风险"),
        ("low", "低风险"),
        ("info", "提示"),
    ]
    for key, label in labels:
        count = int(risk_summary.get(key) or 0)
        if count:
            parts.append(f"{label} {count}")
    return " · ".join(parts)