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

export async function GET() {
  try {
    const [total, contacted, withEmail] = await Promise.all([
      prisma.lead.count(),
      prisma.lead.count({ where: { tags: { contains: "kontaktiert" } } }),
      prisma.lead.count({ where: { email: { not: null } } }),
    ]);
    const newLeads = total - contacted;

    // Daily counts for last 7 days
    const sevenDaysAgo = new Date();
    sevenDaysAgo.setDate(sevenDaysAgo.getDate() - 6);
    sevenDaysAgo.setHours(0, 0, 0, 0);

    const recentLeads = await prisma.lead.findMany({
      where: { capturedAt: { gte: sevenDaysAgo } },
      select: { capturedAt: true },
    });

    // Build daily counts map
    const dailyMap: Record<string, number> = {};
    for (let i = 0; i < 7; i++) {
      const d = new Date(sevenDaysAgo);
      d.setDate(d.getDate() + i);
      dailyMap[d.toISOString().split("T")[0]] = 0;
    }
    for (const lead of recentLeads) {
      const key = lead.capturedAt.toISOString().split("T")[0];
      if (key in dailyMap) dailyMap[key]++;
    }

    const dailyCounts = Object.entries(dailyMap).map(([date, count]) => ({ date, count }));

    return NextResponse.json({ total, new: newLeads, contacted, withEmail, dailyCounts });
  } catch (err) {
    console.error("GET /api/leads/stats error:", err);
    return NextResponse.json({ error: "Failed" }, { status: 500 });
  }
}