import { logError } from "@/lib/logger";
import { NextResponse } from "next/server";
import { query } from "@/lib/db";

export const runtime = "nodejs";

/**
 * Platform metrics endpoint.
 * Returns total / 27h / 7d / 30d new counts for all platform entities.
 */
export async function GET() {
  try {
    // Query all entity counts in parallel
    // Tables: user, workspace, project, repo, room, project_skill
    const entities = [
      { name: "users", table: '"user"' },
      { name: "workspaces", table: "workspace" },
      { name: "projects", table: "project" },
      { name: "repos", table: "repo" },
      { name: "rooms", table: "room" },
      { name: "skills", table: "project_skill" },
    ];

    const results = await Promise.all(
      entities.map(async ({ name, table }) => {
        const res = await query<{
          total: string;
          new_27h: string;
          new_7d: string;
          new_30d: string;
        }>(
          `SELECT
            COUNT(*) AS total,
            COUNT(*) FILTER (WHERE created_at >= NOW() - INTERVAL '27 hours') AS new_27h,
            COUNT(*) FILTER (WHERE created_at >= NOW() - INTERVAL '7 days') AS new_7d,
            COUNT(*) FILTER (WHERE created_at >= NOW() - INTERVAL '30 days') AS new_30d
           FROM ${table}`
        );
        const row = res.rows[0];
        return {
          name,
          total: parseInt(row.total, 10),
          new_27h: parseInt(row.new_27h, 10),
          new_7d: parseInt(row.new_7d, 10),
          new_30d: parseInt(row.new_30d, 10),
        };
      })
    );

    const metrics: Record<string, unknown> = {};
    for (const r of results) {
      metrics[r.name] = {
        total: r.total,
        last_27h: r.new_27h,
        last_7d: r.new_7d,
        last_30d: r.new_30d,
      };
    }

    return NextResponse.json({ metrics, timestamp: new Date().toISOString() });
  } catch (e) {
    logError("Metrics error:", e);
    return NextResponse.json({ error: "服务器错误" }, { status: 500 });
  }
}