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

export const runtime = "nodejs";

interface AuditLog {
  source: "user_activity" | "project_audit";
  id: number;
  actor_uid: string | null;
  action: string;
  resource: string | null;
  ip_address: string | null;
  user_agent: string | null;
  created_at: string;
}

export async function GET(req: NextRequest) {
  try {
    const { searchParams } = req.nextUrl;
    const page = Math.max(1, parseInt(searchParams.get("page") || "1", 10));
    const pageSize = Math.max(1, parseInt(searchParams.get("pageSize") || "20", 10));
    const source = searchParams.get("source") || "all";
    const action = searchParams.get("action") || "";
    const offset = (page - 1) * pageSize;

    const actionPattern = action ? `%${action}%` : null;
    const limitOffsetParams: unknown[] = [pageSize, offset];

    let userQuery = "";
    let projectQuery = "";
    let userParams: unknown[] = [];
    let projectParams: unknown[] = [];

    // Build user_activity_log query
    if (source !== "project") {
      if (action) {
        userParams = [actionPattern, ...limitOffsetParams];
        userQuery = `SELECT 'user_activity' as source, id,
                COALESCE(user_uid::text, '') as actor_uid,
                action, NULL::text as resource,
                ip_address, user_agent, created_at::text as created_at
         FROM user_activity_log
         WHERE action ILIKE $1
         ORDER BY created_at DESC
         LIMIT $2 OFFSET $3`;
      } else {
        userParams = limitOffsetParams;
        userQuery = `SELECT 'user_activity' as source, id,
                COALESCE(user_uid::text, '') as actor_uid,
                action, NULL::text as resource,
                ip_address, user_agent, created_at::text as created_at
         FROM user_activity_log
         ORDER BY created_at DESC
         LIMIT $1 OFFSET $2`;
      }
    }

    // Build project_audit_log query
    if (source !== "user") {
      if (action) {
        projectParams = [actionPattern, ...limitOffsetParams];
        projectQuery = `SELECT 'project_audit' as source, id,
                COALESCE(actor::text, '') as actor_uid,
                action, details as resource, ip_address,
                NULL as user_agent, created_at::text as created_at
         FROM project_audit_log
         WHERE action ILIKE $1
         ORDER BY created_at DESC
         LIMIT $2 OFFSET $3`;
      } else {
        projectParams = limitOffsetParams;
        projectQuery = `SELECT 'project_audit' as source, id,
                COALESCE(actor::text, '') as actor_uid,
                action, details as resource, ip_address,
                NULL as user_agent, created_at::text as created_at
         FROM project_audit_log
         ORDER BY created_at DESC
         LIMIT $1 OFFSET $2`;
      }
    }

    const [userLogs, projectLogs] = await Promise.all([
      userQuery ? query<AuditLog>(userQuery, userParams) : Promise.resolve({ rows: [] as AuditLog[] }),
      projectQuery ? query<AuditLog>(projectQuery, projectParams) : Promise.resolve({ rows: [] as AuditLog[] }),
    ]);

    // 合并并排序
    const combined = [...userLogs.rows, ...projectLogs.rows].sort(
      (a, b) => new Date(b.created_at).getTime() - new Date(a.created_at).getTime()
    );

    // 总数
    const [userCountRes, projectCountRes] = await Promise.all([
      userCountQuery(userParams, action),
      projectCountQuery(projectParams, action),
    ]);
    const total = parseInt(String(userCountRes.rows[0]?.count || "0"), 10) +
                   parseInt(String(projectCountRes.rows[0]?.count || "0"), 10);

    return NextResponse.json({ logs: combined.slice(0, pageSize), total, page, pageSize });
  } catch (e) {
    logError("Platform audit logs error:", e);
    return NextResponse.json({ error: "服务器错误" }, { status: 500 });
  }
}

async function userCountQuery(params: unknown[], action: string | null) {
  if (!params.length) return { rows: [] as { count: string }[] };
  if (action) {
    return query<{ count: string }>(
      `SELECT COUNT(*) FROM user_activity_log WHERE action ILIKE $1`,
      [params[0]]
    );
  }
  return query<{ count: string }>(`SELECT COUNT(*) FROM user_activity_log`);
}

async function projectCountQuery(params: unknown[], action: string | null) {
  if (!params.length) return { rows: [] as { count: string }[] };
  if (action) {
    return query<{ count: string }>(
      `SELECT COUNT(*) FROM project_audit_log WHERE action ILIKE $1`,
      [params[0]]
    );
  }
  return query<{ count: string }>(`SELECT COUNT(*) FROM project_audit_log`);
}