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package io.resys.hdes.client.spi;

/*-
 * #%L
 * hdes-client-api
 * %%
 * Copyright (C) 2020 - 2021 Copyright 2020 ReSys OÜ
 * %%
 * 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
 * 
 *      http://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.
 * #L%
 */

import java.io.Serializable;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Optional;
import java.util.function.Supplier;

import com.fasterxml.jackson.databind.JsonNode;

import io.resys.hdes.client.api.HdesClient.ExecutorBuilder;
import io.resys.hdes.client.api.HdesClient.ExecutorInput;
import io.resys.hdes.client.api.HdesClient.HdesTypesMapper;
import io.resys.hdes.client.api.ast.TypeDef;
import io.resys.hdes.client.api.exceptions.ProgramException;
import io.resys.hdes.client.api.programs.DecisionProgram;
import io.resys.hdes.client.api.programs.FlowProgram;
import io.resys.hdes.client.api.programs.ImmutableProgramContextNamedValue;
import io.resys.hdes.client.api.programs.Program.ExecutionLog;
import io.resys.hdes.client.api.programs.Program.ProgramContext;
import io.resys.hdes.client.api.programs.Program.ProgramContextNamedValue;
import io.resys.hdes.client.api.programs.ProgramEnvir;
import io.resys.hdes.client.api.programs.ServiceData;
import io.resys.hdes.client.api.programs.ServiceProgram;
import io.resys.hdes.client.spi.config.HdesClientConfig.DependencyInjectionContext;

public class ImmutableProgramContext implements ProgramContext {
  private static final long serialVersionUID = 6910151114801874342L;
  private final HdesTypesMapper factory;
  private final ExecutorInput callbackThatWillSupplyAllData;
  
  // data object that should be directly transformed to target
  private final Object serviceData;

  // generic data sources that will be used for init of genericData
  private final List>> suppliers;

  // generic data to transform to target
  private Map genericData;
    
  private final DependencyInjectionContext dependencyInjectionContext;
  private final ProgramEnvir envir;
  
  private final ExecutionLog log;
  
  public ImmutableProgramContext(
      List>> inputs, 
      Object serviceData, 
      ExecutorInput input, 
      HdesTypesMapper factory, 
      ProgramEnvir envir,
      DependencyInjectionContext dependencyInjectionContext,
      ExecutionLog log) {
    super();
    this.envir = envir;
    this.suppliers = inputs;
    this.callbackThatWillSupplyAllData = input;
    this.factory = factory;
    this.serviceData = serviceData;
    this.dependencyInjectionContext = dependencyInjectionContext;
    this.log = log;
  }
  
  @Override
  public ExecutorBuilder executor() {
    return new HdesClientExecutorBuilder(envir, factory, dependencyInjectionContext);
  }

  @Override
  public Serializable getValue(String typeDefName) {
    final var result = getValueWithMeta(typeDefName);
    if(result.getValue() == null) {
      throw new ProgramException("Can't get value with name: '" + typeDefName + "', because it's null and found in context: '" + result.getFound() + "'");
    }
    return result.getValue();
  }
  @Override
  public Optional findValue(String typeDefName) {
    final var result = getValueWithMeta(typeDefName);
    return Optional.ofNullable(result.getValue());
  }
  @Override
  public  T getBean(Class type) {
    return dependencyInjectionContext.get(type);
  }
  @Override
  public ServiceProgram getService(String name) {
    return (ServiceProgram) envir.getServicesByName().get(name).getProgram().get();
  }
  @Override
  public FlowProgram getFlow(String name) {
    return (FlowProgram) envir.getFlowsByName().get(name).getProgram().get();
  }
  @Override
  public DecisionProgram getDecision(String name) {
    return (DecisionProgram) envir.getDecisionsByName().get(name).getProgram().get();
  }

  @Override
  public Serializable getValue(TypeDef typeDef) {

    if(typeDef.getBeanType() != null && typeDef.getBeanType().isAssignableFrom(this.getClass())) {
      return this;
    }
    
    // data class map compatible
    if(callbackThatWillSupplyAllData != null) {
      Serializable target = (Serializable) callbackThatWillSupplyAllData.apply(typeDef);
      if(target != null) {
        return target;
      }
    }
    
    if(Boolean.TRUE.equals(typeDef.getData()) && serviceData != null) {
      return (Serializable) factory.toType(serviceData, typeDef.getBeanType());
    }
    
    init();
    
    if(typeDef.getData() && typeDef.getBeanType() != null) {
      return (Serializable) factory.toType(genericData, typeDef.getBeanType());
    }
    
    return (Serializable) genericData.get(typeDef.getName());
  }
  
  @Override
  public ProgramContextNamedValue getValueWithMeta(String typeDefName) {
    init();
    
    if(genericData.containsKey(typeDefName)) {
      return ImmutableProgramContextNamedValue.builder().value((Serializable) genericData.get(typeDefName)).found(true).build();
    }
    
    return ImmutableProgramContextNamedValue.builder().found(false).build();
  }
  
  private void init() {
    if(genericData == null) {
      genericData = new HashMap<>();
      suppliers.forEach(e -> genericData.putAll(e.get()));
    }
  }
  
  public static Builder builder(HdesTypesMapper factory, ProgramEnvir envir, DependencyInjectionContext dependencyInjectionContext) {
    return new Builder(factory, envir, dependencyInjectionContext);
  }
  public static Builder from(ProgramContext init) {
    ImmutableProgramContext context = (ImmutableProgramContext) init;
    return new Builder(context.factory, context.envir, context.dependencyInjectionContext);
  }
  
  public static class Builder {
    private final HdesTypesMapper factory;
    private final List>> suppliers = new ArrayList<>();
    private final ProgramEnvir envir;
    private final DependencyInjectionContext dependencyInjectionContext;
    private ExecutorInput input;
    private Object serviceData;
    private ExecutionLog log;
    
    public Builder(HdesTypesMapper factory, ProgramEnvir envir, DependencyInjectionContext dependencyInjectionContext) {
      super();
      this.factory = factory;
      this.envir = envir;
      this.dependencyInjectionContext = dependencyInjectionContext;
    }
    public Builder callback(ExecutorInput input) {
      this.input = input;
      return this;
    }
    public Builder map(Map entity) {
      this.suppliers.add(() -> entity);
      return this;
    }
    @SuppressWarnings({ "unchecked", "rawtypes" })
    public Builder entity(Object entity) {
      if(entity.getClass().isAnnotationPresent(ServiceData.class)) {
        serviceData = entity;
      } else if(entity instanceof Map) {
        this.suppliers.add(() -> (Map) entity);
      } else {
        this.suppliers.add(() -> this.factory.toMap(entity));        
      }
      return this;
    }
    public Builder json(JsonNode json) {
      this.suppliers.add(() -> this.factory.toMap(json));
      return this;
    }
    public Builder log(ExecutionLog log) {
      this.log = log;
      return this;
    }
    public ImmutableProgramContext build() {
      if(log == null) {
        log = new ExecutionLog() {};
      }
      return new ImmutableProgramContext(suppliers, serviceData, input, factory, envir, dependencyInjectionContext, log);
    }
  }

  @Override
  public Map toMap(Object input) {
    return factory.toMap(input);
  }
  @Override
  public ExecutionLog getLog() {
    return log;
  }
}