/*
 * QQQ - Low-code Application Framework for Engineers.
 * Copyright (C) 2026.  Kingsrook, LLC
 * 651 N Broad St Ste 205 # 6917 | Middletown DE 19709 | United States
 * contact@kingsrook.com
 * https://github.com/Kingsrook/
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

// SPDX-License-Identifier: Apache-2.0
package com.kingsrook.qbits.printing;
import java.nio.file.*;
import java.nio.charset.StandardCharsets;
import java.sql.*;
import java.time.*;
import java.util.*;
import java.util.concurrent.*;
import java.util.concurrent.atomic.AtomicReference;
import com.kingsrook.qqq.middleware.javalin.*;
import io.javalin.Javalin;
import org.json.*;
/** Fixture only: real checkout host, synthetic SDK producer, no physical printer. */
public final class WorkloadFixture {
 public static void main(String[] args) throws Exception {
  Path dir=Path.of(args[0]).toAbsolutePath();
  if(!dir.getFileName().toString().startsWith("run-"))throw new IllegalArgumentException("Owned run directory required");
  String jdbc="jdbc:h2:file:"+dir.resolve("synthetic").toString().replace('\\','/')+";DB_CLOSE_DELAY=-1";
  String password="synthetic-"+UUID.randomUUID();
  List<QApplicationLauncher> launches=new ArrayList<>(); List<PrintingService> services=new ArrayList<>();
  List<String> devices=new ArrayList<>(); JSONArray inputs=new JSONArray();
  boolean idle=args.length>1 && args[1].equals("idle"); int total=idle?40:10000; long started=System.nanoTime(); int exit=1;
  try {
   for(int tenant=0;tenant<2;tenant++) {
    PrintingLocalHost host=new PrintingLocalHost(new PrintingLocalSettings(jdbc,"sa","","tenant-"+tenant,0,"fixture-only-management-token-123456","operator",password));
    AtomicReference<Javalin> app=new AtomicReference<>();
    QApplicationLauncher launch=QApplicationLauncher.run(host,new QApplicationLauncherConfig().withRegisterShutdownHook(false).withServerCustomizer(server->{host.configure(server,false);server.withJavalinConfigurationCustomizer(app::set);}));
    launches.add(launch);
    PrintingService service=launch.getQInstance().getQBits().values().stream().map(v->v.getConfig()).filter(PrintingQBitConfig.class::isInstance).map(PrintingQBitConfig.class::cast).findFirst().orElseThrow().getService();
    services.add(service);
    for(int lane=0;lane<4;lane++) {
     JSONObject enrolled=service.enrollForUser(service.createEnrollment("default","Synthetic lane").put("deviceName","Synthetic lane").put("agentVersion","qualification"),"operator");
     String device=enrolled.getString("deviceId");devices.add(device);
     service.inventory(device,new JSONArray().put(new JSONObject().put("printerId","synthetic").put("name","No physical printer").put("status","READY").put("formats",new JSONArray().put("ZPL"))));service.enablePrinter(device,"synthetic",true);
     inputs.put(new JSONObject().put("origin","http://127.0.0.1:"+app.get().port()+"/").put("username","operator").put("password",password).put("tenant","tenant-"+tenant).put("deviceId",device).put("deviceToken",enrolled.getString("deviceToken")));
    }
   }
   // Only synthetic credentials inside the already protected run directory.
   Files.writeString(dir.resolve("input.json"),new JSONObject().put("lanes",inputs).put("idle",idle).put("jobsPerLane",total/8).toString());
   await(dir.resolve("ready"),Duration.ofMinutes(2));
   byte[] payload=("^XA^FO20,20^FDSYNTHETIC NOT PRINTED^FS"+" ".repeat(980)+"^XZ").getBytes(StandardCharsets.US_ASCII);
   String encoded=Base64.getEncoder().encodeToString(payload);
   long producing=System.nanoTime();
   if(idle) { for(int job=0;job<total;job++) { int lane=job%8; PrintingService service=services.get(lane/4); JSONObject request=new JSONObject().put("deviceId",devices.get(lane)).put("printerId","synthetic").put("title","Synthetic idle workload").put("format","ZPL").put("contentBase64",encoded).put("idempotencyKey","idle-"+job); service.submit(request); await(dir.resolve("completed-"+(job+1)),Duration.ofSeconds(30)); Thread.sleep(200); } } else try(var executor=Executors.newFixedThreadPool(8)) {
    List<Future<?>> futures=new ArrayList<>();
    for(int lane=0;lane<8;lane++) { final int index=lane;
     futures.add(executor.submit(()->{try{
      PrintingService service=services.get(index/4);
      for(int job=0;job<1250;job++) {
       JSONObject request=new JSONObject().put("deviceId",devices.get(index)).put("printerId","synthetic").put("title","Synthetic workload "+job).put("format","ZPL").put("contentBase64",encoded).put("idempotencyKey","lane-"+index+"-"+job);
       JSONObject submitted=service.submit(request);
       if(job%25==0 && !submitted.getString("jobId").equals(service.submit(request).getString("jobId")))throw new IllegalStateException("Replay duplicated job");
      }
     }catch(Exception e){throw new RuntimeException(e);}}));
    }
    for(var future:futures)future.get(15,TimeUnit.MINUTES);
   }
   double producerSeconds=(System.nanoTime()-producing)/1e9;
   Files.writeString(dir.resolve("producer-done"),"done");
   await(dir.resolve("done"),Duration.ofMinutes(15));
   JSONObject client=new JSONObject(Files.readString(dir.resolve("result.json")));
   if(!client.getBoolean("success"))throw new IllegalStateException("Client reported failure");
   JSONObject report=new JSONObject().put("success",true).put("jobs",total).put("receipts",total*3).put("idle",idle).put("producerSeconds",producerSeconds).put("elapsedSeconds",(System.nanoTime()-started)/1e9).put("realPrinterCalls",0);
   try(Connection connection=DriverManager.getConnection(jdbc,"sa","");Statement query=connection.createStatement()) {
    require(query,"SELECT COUNT(*) FROM printing_job",total);
    require(query,"SELECT COUNT(*) FROM printing_job WHERE status='SPOOLED'",total);
    require(query,"SELECT COUNT(*) FROM printing_event",total*3);
    require(query,"SELECT COUNT(*) FROM printing_document_orphan",0);
    for(int tenant=0;tenant<2;tenant++) {
     require(query,"SELECT COUNT(*) FROM printing_job WHERE tenant_id='tenant-"+tenant+"'",total/2);
     require(query,"SELECT retained_bytes FROM printing_resource_usage WHERE tenant_id='tenant-"+tenant+"' AND device_id=''",(total/2L)*payload.length);
    }
    JSONArray cross=new JSONArray();for(int tenant=0;tenant<2;tenant++) {
     String foreign=services.get(1-tenant).jobsPage(1,null).getJSONArray("jobs").getJSONObject(0).getString("jobId");
     try {services.get(tenant).getJob(foreign);throw new IllegalStateException("Foreign job visible");}catch(PrintingException denied){if(denied.getStatus()!=404)throw denied;}
     cross.put(true);
    }
    report.put("tenantIsolation",cross).put("retainedAccountingVerified",true).put("bytesPerDocument",payload.length);
   }
   Files.writeString(dir.resolve("server-result.json"),report.toString(2));exit=0;
  } catch(Throwable failure) {
   Files.writeString(dir.resolve("server-error.json"),new JSONObject().put("error",failure.getClass().getName()).put("cause",failure.getCause()==null?"":failure.getCause().getClass().getName()).toString());
  } finally {
   for(int i=launches.size()-1;i>=0;i--)launches.get(i).stop();
   try(Connection connection=DriverManager.getConnection(jdbc,"sa","");Statement query=connection.createStatement()){query.execute("SHUTDOWN");}
   Files.writeString(dir.resolve("stopped.json"),new JSONObject().put("normalStop",true).put("exitCode",exit).toString());
  }
  System.exit(exit);
 }
 static void await(Path file,Duration limit)throws Exception {long deadline=System.nanoTime()+limit.toNanos();while(!Files.exists(file)){if(System.nanoTime()>deadline)throw new TimeoutException("Fixture deadline");Thread.sleep(100);}}
 static void require(Statement query,String sql,long expected)throws Exception {try(ResultSet rows=query.executeQuery(sql)){if(!rows.next()||rows.getLong(1)!=expected)throw new IllegalStateException("Synthetic count/accounting mismatch");}}
}