package com.dlink.executor;

import com.dlink.assertion.Asserts;
import com.dlink.executor.custom.CustomTableEnvironmentImpl;
import com.dlink.executor.custom.CustomTableResultImpl;
import com.dlink.interceptor.FlinkInterceptor;
import com.dlink.result.SqlExplainResult;
import com.fasterxml.jackson.databind.node.ObjectNode;
import org.apache.flink.configuration.Configuration;
import org.apache.flink.runtime.jobgraph.JobGraph;
import org.apache.flink.streaming.api.environment.StreamExecutionEnvironment;
import org.apache.flink.table.api.ExplainDetail;
import org.apache.flink.table.api.StatementSet;
import org.apache.flink.table.api.TableResult;
import org.apache.flink.table.catalog.CatalogManager;
import org.apache.flink.table.functions.ScalarFunction;
import org.apache.flink.table.functions.UserDefinedFunction;
import org.apache.flink.table.operations.Operation;
import org.apache.flink.table.operations.command.ResetOperation;
import org.apache.flink.table.operations.command.SetOperation;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * Executor
 * @author  wenmo
 * @since  2021/11/17
 **/
public abstract class Executor {

    protected StreamExecutionEnvironment environment;
    protected CustomTableEnvironmentImpl stEnvironment;
    protected EnvironmentSetting environmentSetting;
    protected ExecutorSetting executorSetting;

    protected SqlManager sqlManager = new SqlManager();
    protected boolean useSqlFragment = true;

    public SqlManager getSqlManager() {
        return sqlManager;
    }

    public boolean isUseSqlFragment() {
        return useSqlFragment;
    }

    public static Executor build(){
        return new LocalStreamExecutor(ExecutorSetting.DEFAULT);
    }

    public static Executor build(EnvironmentSetting environmentSetting,ExecutorSetting executorSetting){
        if(environmentSetting.isUseRemote()){
            return buildRemoteExecutor(environmentSetting,executorSetting);
        }else{
            return buildLocalExecutor(executorSetting);
        }
    }

    public static Executor buildLocalExecutor(ExecutorSetting executorSetting){
        return new LocalStreamExecutor(executorSetting);
    }

    public static Executor buildAppStreamExecutor(ExecutorSetting executorSetting){
        return new AppStreamExecutor(executorSetting);
    }

    public static Executor buildRemoteExecutor(EnvironmentSetting environmentSetting,ExecutorSetting executorSetting){
        environmentSetting.setUseRemote(true);
        return new RemoteStreamExecutor(environmentSetting,executorSetting);
    }

    public StreamExecutionEnvironment getEnvironment(){
        return environment;
    }

    public CustomTableEnvironmentImpl getCustomTableEnvironmentImpl(){
        return stEnvironment;
    }

    public ExecutorSetting getExecutorSetting(){
        return executorSetting;
    }

    public EnvironmentSetting getEnvironmentSetting(){
        return environmentSetting;
    }

    protected void init(){
        initEnvironment();
        initStreamExecutionEnvironment();
    }

    public void update(ExecutorSetting executorSetting){
        updateEnvironment(executorSetting);
        updateStreamExecutionEnvironment(executorSetting);
    }

    private void initEnvironment(){
        if(executorSetting.getCheckpoint()!=null&&executorSetting.getCheckpoint()>0){
            environment.enableCheckpointing(executorSetting.getCheckpoint());
        }
        if(executorSetting.getParallelism()!=null&&executorSetting.getParallelism()>0){
            environment.setParallelism(executorSetting.getParallelism());
        }
        if(executorSetting.getConfig()!=null) {
            Configuration configuration = Configuration.fromMap(executorSetting.getConfig());
            environment.getConfig().configure(configuration, null);
        }
    }

    private void updateEnvironment(ExecutorSetting executorSetting){
        if(executorSetting.getCheckpoint()!=null&&executorSetting.getCheckpoint()>0){
            environment.enableCheckpointing(executorSetting.getCheckpoint());
        }
        if(executorSetting.getParallelism()!=null&&executorSetting.getParallelism()>0){
            environment.setParallelism(executorSetting.getParallelism());
        }
        if(executorSetting.getConfig()!=null) {
            Configuration configuration = Configuration.fromMap(executorSetting.getConfig());
            environment.getConfig().configure(configuration, null);
        }
    }

    private void initStreamExecutionEnvironment(){
        useSqlFragment = executorSetting.isUseSqlFragment();
        stEnvironment = CustomTableEnvironmentImpl.create(environment);
        if(executorSetting.getJobName()!=null&&!"".equals(executorSetting.getJobName())){
            stEnvironment.getConfig().getConfiguration().setString("pipeline.name", executorSetting.getJobName());
        }
        if(executorSetting.getConfig()!=null){
            for (Map.Entry<String, String> entry : executorSetting.getConfig().entrySet()) {
                stEnvironment.getConfig().getConfiguration().setString(entry.getKey(), entry.getValue());
            }
        }
    }

    private void updateStreamExecutionEnvironment(ExecutorSetting executorSetting){
        useSqlFragment = executorSetting.isUseSqlFragment();
        copyCatalog();
        if(executorSetting.getJobName()!=null&&!"".equals(executorSetting.getJobName())){
            stEnvironment.getConfig().getConfiguration().setString("pipeline.name", executorSetting.getJobName());
        }
        if(executorSetting.getConfig()!=null){
            for (Map.Entry<String, String> entry : executorSetting.getConfig().entrySet()) {
                stEnvironment.getConfig().getConfiguration().setString(entry.getKey(), entry.getValue());
            }
        }
    }

    private void copyCatalog(){
        String[] catalogs = stEnvironment.listCatalogs();
        CustomTableEnvironmentImpl newstEnvironment = CustomTableEnvironmentImpl.create(environment);
        for (int i = 0; i < catalogs.length; i++) {
            if(stEnvironment.getCatalog(catalogs[i]).isPresent()) {
                newstEnvironment.getCatalogManager().unregisterCatalog(catalogs[i],true);
                newstEnvironment.registerCatalog(catalogs[i], stEnvironment.getCatalog(catalogs[i]).get());
            }
        }
        stEnvironment = newstEnvironment;
    }

    private String pretreatStatement(String statement){
        return FlinkInterceptor.pretreatStatement(this,statement);
    }

    private boolean pretreatExecute(String statement){
        return !FlinkInterceptor.build(this,statement);
    }

    public TableResult executeSql(String statement){
        statement = pretreatStatement(statement);
        if(pretreatExecute(statement)) {
            return stEnvironment.executeSql(statement);
        }else{
            return CustomTableResultImpl.TABLE_RESULT_OK;
        }
    }

    public String explainSql(String statement, ExplainDetail... extraDetails){
        statement = pretreatStatement(statement);
        if(pretreatExecute(statement)) {
            return stEnvironment.explainSql(statement,extraDetails);
        }else{
            return "";
        }
    }

    public SqlExplainResult explainSqlRecord(String statement, ExplainDetail... extraDetails){
        statement = pretreatStatement(statement);
        if(Asserts.isNotNullString(statement)&&pretreatExecute(statement)) {
            return stEnvironment.explainSqlRecord(statement,extraDetails);
        }else{
            return null;
        }
    }

    public ObjectNode getStreamGraph(String statement){
        statement = pretreatStatement(statement);
        if(pretreatExecute(statement)) {
            return stEnvironment.getStreamGraph(statement);
        }else{
            return null;
        }
    }

    public void registerFunction(String name, ScalarFunction function){
        stEnvironment.registerFunction(name,function);
    }

    public void createTemporarySystemFunction(String name, Class<? extends UserDefinedFunction> var2){
        stEnvironment.createTemporarySystemFunction(name,var2);
    }

    public CatalogManager getCatalogManager(){
        return stEnvironment.getCatalogManager();
    }

    public JobGraph getJobGraphFromInserts(List<String> statements){
        return stEnvironment.getJobGraphFromInserts(statements);
    }

    public StatementSet createStatementSet(){
        return stEnvironment.createStatementSet();
    }

    public TableResult executeStatementSet(List<String> statements){
        StatementSet statementSet = stEnvironment.createStatementSet();
        for (String item : statements) {
            statementSet.addInsertSql(item);
        }
        return statementSet.execute();
    }

    public void submitSql(String statements){
        executeSql(statements);
    }

    public void submitStatementSet(List<String> statements){
        executeStatementSet(statements);
    }

    public boolean parseAndLoadConfiguration(String statement){
        List<Operation> operations = stEnvironment.getParser().parse(statement);
        for(Operation operation : operations){
            if(operation instanceof SetOperation){
                callSet((SetOperation)operation);
                return true;
            } else if (operation instanceof ResetOperation){
                callReset((ResetOperation)operation);
                return true;
            }
        }
        return false;
    }

    private void callSet(SetOperation setOperation){
        if (setOperation.getKey().isPresent() && setOperation.getValue().isPresent()) {
            String key = setOperation.getKey().get().trim();
            String value = setOperation.getValue().get().trim();
            Map<String,String> confMap = new HashMap<>();
            confMap.put(key,value);
            Configuration configuration = Configuration.fromMap(confMap);
            environment.getConfig().configure(configuration,null);
            stEnvironment.getConfig().addConfiguration(configuration);
        }
    }

    private void callReset(ResetOperation resetOperation) {
        // to do nothing
    }
}
