import { NextRequest, NextResponse } from "next/server";
import { prisma } from "@/lib/db";

export async function POST(req: NextRequest) {
  try {
    const body = await req.json() as {
      ids: string[];
      action: "status" | "priority" | "tag" | "delete";
      value: string;
    };
    const { ids, action, value } = body;

    if (!ids?.length) return NextResponse.json({ error: "No IDs provided" }, { status: 400 });

    if (action === "delete") {
      const { count } = await prisma.lead.deleteMany({ where: { id: { in: ids } } });
      return NextResponse.json({ updated: count });
    }

    if (action === "status") {
      const { count } = await prisma.lead.updateMany({
        where: { id: { in: ids } },
        data: { status: value },
      });
      // Create events for status change
      for (const id of ids) {
        await prisma.leadEvent.create({
          data: { leadId: id, event: `Status geändert zu "${value}" (Bulk)` },
        }).catch(() => {}); // ignore if lead was deleted
      }
      return NextResponse.json({ updated: count });
    }

    if (action === "priority") {
      const { count } = await prisma.lead.updateMany({
        where: { id: { in: ids } },
        data: { priority: value },
      });
      return NextResponse.json({ updated: count });
    }

    if (action === "tag") {
      // Add tag to each lead's tags JSON array
      const leads = await prisma.lead.findMany({ where: { id: { in: ids } }, select: { id: true, tags: true } });
      let count = 0;
      for (const lead of leads) {
        const existing: string[] = JSON.parse(lead.tags || "[]");
        if (!existing.includes(value)) {
          await prisma.lead.update({
            where: { id: lead.id },
            data: { tags: JSON.stringify([...existing, value]) },
          });
          count++;
        }
      }
      return NextResponse.json({ updated: count });
    }

    return NextResponse.json({ error: "Unknown action" }, { status: 400 });
  } catch (err) {
    console.error("POST /api/leads/bulk error:", err);
    return NextResponse.json({ error: "Bulk action failed" }, { status: 500 });
  }
}