package TestingSystem.Common;
import Common.Constants;
import Common.Utils.Utils;
import Repository.EmailMessage;
import Repository.Server.ServerCode;
import Repository.Server.ServerExchangeUnit_2021;
import TestingSystem.Common.TestingPackage.TestingPackage;
import TestingSystem.Common.TestingPackageToKill.TestingPackageToKill;
import Visual_DVM_2021.Passes.PassException;
import Visual_DVM_2021.Passes.Server.TestingSystemPass;
import javafx.util.Pair;

import java.io.FileWriter;
import java.io.Serializable;
import java.util.Date;
import java.util.Vector;
public abstract class TestingPlanner<P extends TestingPackage> {
    protected P testingPackage;
    protected int getSleepMillis() {
        return 2000;
    }
    //---
    protected Object ServerCommand(ServerCode code_in, String arg, Serializable object_in) throws Exception {
        TestingSystemPass<Object> pass = new TestingSystemPass<Object>() {
            @Override
            public String getDescription() {
                return "";
            }
            @Override
            protected void ServerAction() throws Exception {
                Command(new ServerExchangeUnit_2021(code_in, arg, object_in));
                target = response.object;
            }
        };
        if (!pass.Do()) throw new PassException("Ошибка взаимодействия с сервером " + code_in);
        return pass.target;
    }
    protected Object ServerCommand(ServerCode code_in, Serializable object_in) throws Exception {
        return ServerCommand(code_in, "", object_in);
    }
    protected Object ServerCommand(ServerCode code_in) throws Exception {
        return ServerCommand(code_in, "", null);
    }
    //---
    protected boolean isPrintOn() {
        return true;
    }
    protected void Print(String message) {
        try {
            if (isPrintOn()) {
                FileWriter testLog = new FileWriter(getClass().getSimpleName() + "_Log.txt", true);
                String dmessage = Utils.Brackets(new Date()) + " " + message;
                System.out.println(dmessage);
                testLog.write(dmessage + "\n");
                testLog.close();
            }
        } catch (Exception ex) {
            ex.printStackTrace();
        }
    }
    //---
    void UpdatePackageState(TasksPackageState state_in) throws Exception {
        testingPackage.state = state_in;
        testingPackage.ChangeDate = new Date().getTime();
        ServerCommand(ServerCode.EditObject, testingPackage);
        switch (testingPackage.state) {
            case Done:
            case Aborted:
            case CompilationExecution:
            case RunningExecution:
                EmailPackage();
                break;
        }
    }
    void UpdatePackage() throws Exception {
        testingPackage.ChangeDate = new Date().getTime();
        ServerCommand(ServerCode.EditObject, testingPackage);
    }
    void EmailPackage() throws Exception {
        if (testingPackage.needsEmail == 1) {
            EmailMessage message = new EmailMessage();
            message.subject = "Состояние пакета задач " + Utils.Brackets(testingPackage) + " изменилось на " + Utils.Brackets(testingPackage.state.getDescription());
            message.text = testingPackage.description;
            message.targets.add(testingPackage.sender_address);
            ServerCommand(ServerCode.Email, message);
        }
    }
    //---
    protected abstract ServerCode getActivePackagesCode();
    protected abstract ServerCode getCheckIfNeedsKillCode();
    protected abstract TasksPackageState getStateAfterStart();
    protected void InitSessionCredentials() {
    }
    protected abstract void TestsSynchronize() throws Exception;
    protected abstract void PackageWorkspaceCreation() throws Exception;
    protected abstract void AnalyseResults() throws Exception;
    protected abstract void PackageStart() throws Exception;
    protected abstract boolean CheckNextState() throws Exception;
    protected abstract void DownloadResults() throws Exception;
    protected abstract void Kill() throws Exception;
    protected boolean Connect() {
        return true;
    }
    protected void Disconnect() {
    }
    //жизненный цикл планировщика
    protected void Session() throws Exception {
        switch (testingPackage.state) {
            case TestsSynchronize:
                TestsSynchronize();
                UpdatePackageState(TasksPackageState.PackageWorkspaceCreation);
                break;
            case PackageWorkspaceCreation:
                PackageWorkspaceCreation();
                UpdatePackageState(TasksPackageState.PackageStart);
                break;
            case PackageStart:
                PackageStart();
                testingPackage.StartDate = new Date().getTime();
                UpdatePackageState(getStateAfterStart());
                break;
            case RunningEnd:
                DownloadResults();
                UpdatePackageState(TasksPackageState.Analysis);
                break;
            default:
                if (CheckNextState()) UpdatePackage();
                break;
        }
    }
    // ---
    protected void PerformPackage(TestingPackage package_in) throws Exception{
        testingPackage = (P) package_in;
        //--
        Print(testingPackage.id + ":" + testingPackage.state.getDescription());
        //--
        if (testingPackage.connectionErrosCount>=10){
            Print(testingPackage.id+" had 10 connection errors. stop");
            UpdatePackageState(TasksPackageState.ConnectionError);
        }else {
            //--
            InitSessionCredentials();
            if (testingPackage.state.equals(TasksPackageState.Analysis)) {
                AnalyseResults();
                UpdatePackageState(TasksPackageState.Done);
            } else {
                try {
                    if (Connect()) {
                        int ptk_id = (int) ServerCommand(getCheckIfNeedsKillCode(), testingPackage.id);
                        if (ptk_id != Constants.Nan) {
                            Print("package " + testingPackage.id + " NEEDS TO KILL");
                            Kill();
                            UpdatePackageState(TasksPackageState.Aborted);
                            ServerCommand(ServerCode.DeleteObjectByPK, new Pair(TestingPackageToKill.class, ptk_id));
                        } else {
                            Session();
                        }
                    } else {
                        testingPackage.connectionErrosCount++;
                        UpdatePackage();
                    }
                } catch (Exception ex) {
                    Print("Ошибка сеанса. Соединение будет разорвано.");
                    ex.printStackTrace();
                    Print(ex.getMessage());
                    //
                    testingPackage.connectionErrosCount++;
                    UpdatePackage();
                } finally {
                    Disconnect();
                }
            }
        }
        //--
        testingPackage.destructor();
        testingPackage = null;
        System.gc();
        //--

    }
    public void Perform() {
        try {
            testingPackage = null;
            Vector<P> activePackages = (Vector<P>) ServerCommand(getActivePackagesCode());
          //  System.out.println(this.getClass().getSimpleName()+": found "+activePackages.size()+" active packages"); //Тесты:
            for (P activePackage: activePackages)
                PerformPackage(activePackage);
        } catch (Exception ex) {
            ex.printStackTrace();
        } finally {
            Utils.sleep(getSleepMillis());
        }
    }
}