/*
 * Copyright 2017 Red Hat, Inc. and/or its affiliates.
 *
 * 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.
 */

package org.jbpm.services.task.impl.model;

import java.io.IOException;
import java.io.ObjectInput;
import java.io.ObjectOutput;
import java.util.Collections;
import java.util.List;

import java.util.Objects;
import javax.persistence.Basic;
import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Embedded;
import javax.persistence.Entity;
import javax.persistence.EnumType;
import javax.persistence.Enumerated;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Index;
import javax.persistence.JoinColumn;
import javax.persistence.OneToMany;
import javax.persistence.SequenceGenerator;
import javax.persistence.Table;
import javax.persistence.Transient;
import javax.persistence.Version;

import org.jbpm.services.task.utils.CollectionUtils;
import org.kie.api.task.model.I18NText;
import org.kie.api.task.model.PeopleAssignments;
import org.kie.api.task.model.TaskData;
import org.kie.internal.task.api.model.Deadlines;
import org.kie.internal.task.api.model.Delegation;
import org.kie.internal.task.api.model.InternalTask;
import org.kie.internal.task.api.model.SubTasksStrategy;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

@Entity
@Table(name="Task",
       indexes = {@Index(name = "IDX_Task_Initiator",  columnList="taskInitiator_id"),
                  @Index(name = "IDX_Task_ActualOwner",  columnList="actualOwner_id"),
                  @Index(name = "IDX_Task_CreatedBy",  columnList="createdBy_id"),
                  @Index(name = "IDX_Task_processInstanceId",  columnList="processInstanceId"),
                  @Index(name = "IDX_Task_processId",  columnList="processId"),
                  @Index(name = "IDX_Task_status",  columnList="status"),
                  @Index(name = "IDX_Task_archived",  columnList="archived"),
                  @Index(name = "IDX_Task_workItemId", columnList="workItemId")})
@SequenceGenerator(name="taskIdSeq", sequenceName="TASK_ID_SEQ", allocationSize=1)
public class TaskImpl implements InternalTask {
    /**
     * WSHT uses a name for the unique identifier, for now we use a generated ID which is also the key, which can be
     * mapped to the name or a unique name field added later.
     */
	
    private static final Logger logger = LoggerFactory.getLogger(TaskImpl.class);
    
    @Transient
    private static final int TASK_DESCRIPTION_LENGTH = Integer.parseInt(System.getProperty("org.jbpm.ht.task.description.length", "255"));
    
    
	
    @Id
    @GeneratedValue(strategy = GenerationType.AUTO, generator="taskIdSeq")
    @Column(name = "id")
    private Long                 id = 0L;
    
    @Version
    @Column(name = "OPTLOCK")
    private int                  version;

    /**
     * While WSHT says this is an expression, it always resolves to an integer, so resolve before setting
     * default value is 0.
     */
    private int                  priority;

    private String name;
    
    private String subject;
    
    private String description;
    
    @OneToMany(cascade = CascadeType.ALL, targetEntity=I18NTextImpl.class)
    @JoinColumn(name = "Task_Names_Id", nullable = true)
    private List<I18NText> names        = Collections.emptyList();

    @OneToMany(cascade = CascadeType.ALL, targetEntity=I18NTextImpl.class)
    @JoinColumn(name = "Task_Subjects_Id", nullable = true)
    private List<I18NText> subjects     = Collections.emptyList();

    @OneToMany(cascade = CascadeType.ALL, targetEntity=I18NTextImpl.class)
    @JoinColumn(name = "Task_Descriptions_Id", nullable = true)
    private List<I18NText> descriptions = Collections.emptyList();


    @Embedded
    private PeopleAssignmentsImpl    peopleAssignments;

    @Embedded
    private DelegationImpl           delegation;

    @Embedded
    private TaskDataImpl             taskData;

    @Embedded
    private DeadlinesImpl            deadlines;

    @Enumerated(EnumType.STRING)
    // Default Behaviour
    private SubTasksStrategy subTaskStrategy = SubTasksStrategy.NoAction;
    
    private String               taskType;
    
    private String               formName;
    
    @Basic
    private Short archived = 0;
    

    public TaskImpl() {
    }

    public void writeExternal(ObjectOutput out) throws IOException {
        out.writeLong( id );
        out.writeInt( priority );
        out.writeShort( archived );
        if (taskType != null) {
        	out.writeUTF(taskType);
        } else {
        	out.writeUTF("");
        }
        
        if (formName != null) {
        	out.writeUTF(formName);
        } else {
        	out.writeUTF("");
        }
        
        if (name != null) {
        	out.writeUTF(name);
        } else {
        	out.writeUTF("");
        }
               
        if (subject != null) {
        	out.writeUTF(subject);
        } else {
        	out.writeUTF("");
        }
               
        if (description != null) {
        	out.writeUTF(description);
        } else {
        	out.writeUTF("");
        }
        
        
        CollectionUtils.writeI18NTextList( names, out );
        CollectionUtils.writeI18NTextList( subjects, out );
        CollectionUtils.writeI18NTextList( descriptions, out );

        if (subTaskStrategy != null) {
            out.writeBoolean(true);
            out.writeUTF(subTaskStrategy.toString());
        } else {
            out.writeBoolean(false);
        }
        
        if ( peopleAssignments != null ) {
            out.writeBoolean( true );
            peopleAssignments.writeExternal( out );
        } else {
            out.writeBoolean( false );
        }

        if ( delegation != null ) {
            out.writeBoolean( true );
            delegation.writeExternal( out );
        } else {
            out.writeBoolean( false );
        }

        if ( taskData != null ) {
            out.writeBoolean( true );
            taskData.writeExternal( out );
        } else {
            out.writeBoolean( false );
        }

        if ( deadlines != null ) {
            out.writeBoolean( true );
            deadlines.writeExternal( out );
        } else {
            out.writeBoolean( false );
        }

    }

    public void readExternal(ObjectInput in) throws IOException,
                                            ClassNotFoundException {
        id = in.readLong();
        priority = in.readInt();
        archived = in.readShort();
        taskType = in.readUTF();
        formName = in.readUTF();
        name = in.readUTF();
        subject = in.readUTF();
        description = in.readUTF();
        names = CollectionUtils.readI18NTextList( in );
        subjects = CollectionUtils.readI18NTextList( in );
        descriptions = CollectionUtils.readI18NTextList( in );
        
        if (in.readBoolean()) {
            subTaskStrategy = SubTasksStrategy.valueOf(in.readUTF());
        }
        
        if ( in.readBoolean() ) {
            peopleAssignments = new PeopleAssignmentsImpl();
            peopleAssignments.readExternal( in );
        }

        if ( in.readBoolean() ) {
            delegation = new DelegationImpl();
            delegation.readExternal( in );
        }

        if ( in.readBoolean() ) {
            taskData = new TaskDataImpl();
            taskData.readExternal( in );
        }

        if ( in.readBoolean() ) {
            deadlines = new DeadlinesImpl();
            deadlines.readExternal( in );
        }

    }
    
    public Long getId() {
        return id;
    }

    public void setId(Long id) {
        this.id = id;
    }

     public Boolean isArchived() {
        if (archived == null) {
            return null;
        }
        return (archived == 1) ? Boolean.TRUE : Boolean.FALSE;
    }

    public void setArchived(Boolean archived) {
        if (archived == null) {
            this.archived = null;
        } else {
            this.archived = (archived == true) ? new Short("1") : new Short("0");
        }
    }
    
    public Integer getVersion() {
        return this.version;
    }

    public Integer getPriority() {
        return priority;
    }

    public void setPriority(Integer priority) {
        this.priority = priority;
    }

    public List<I18NText> getNames() {
        return names;
    }

    public void setNames(List<I18NText> names) {
        this.names = names;
    }

    public List<I18NText> getSubjects() {
        return subjects;
    }

    public void setSubjects(List<I18NText> subjects) {
        this.subjects = subjects;
    }

    public List<I18NText> getDescriptions() {
        return descriptions;
    }

    public void setDescriptions(List<I18NText> descriptions) {
        this.descriptions = descriptions;
    }

    public PeopleAssignments getPeopleAssignments() {
        return peopleAssignments;
    }

    public void setPeopleAssignments(PeopleAssignments peopleAssignments) {
        this.peopleAssignments = (PeopleAssignmentsImpl) peopleAssignments;
    }

    public Delegation getDelegation() {
        return delegation;
    }

    public void setDelegation(Delegation delegation) {
        this.delegation = (DelegationImpl) delegation;
    }

    public TaskData getTaskData() {
        return taskData;
    }

    public void setTaskData(TaskData taskData) {
        this.taskData = (TaskDataImpl) taskData;
    }

    public Deadlines getDeadlines() {
        return deadlines;
    }

    public void setDeadlines(Deadlines deadlines) {
        this.deadlines = (DeadlinesImpl) deadlines;
    }

    public String getTaskType() {
        return taskType;
    }

    public void setTaskType(String taskType) {
        this.taskType = taskType;
    }

    public String getFormName() {
        return formName;
    }

    public void setFormName(String formName) {
        this.formName = formName;
    }
    
    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + version;
        result = prime * result + priority;
        result = prime * result + archived.hashCode();
        result = prime * result + ((taskType == null) ? 0 : taskType.hashCode());
        result = prime * result + CollectionUtils.hashCode( descriptions );
        result = prime * result + CollectionUtils.hashCode( names );
        result = prime * result + CollectionUtils.hashCode( subjects );
        result = prime * result + ((peopleAssignments == null) ? 0 : peopleAssignments.hashCode());
        result = prime * result + ((delegation == null) ? 0 : delegation.hashCode());
        result = prime * result + ((taskData == null) ? 0 : taskData.hashCode());
        result = prime * result + ((deadlines == null) ? 0 : deadlines.hashCode());
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if ( this == obj ) return true;
        if ( obj == null ) return false;
        if ( !(obj instanceof TaskImpl) ) return false;
        TaskImpl other = (TaskImpl) obj;
        if ( this.version != other.version ) {
            return false;
        }
        if (!Objects.equals(this.archived, other.archived)) {
            return false;
        }
        if (taskType == null) {
            if (other.taskType != null) return false;
        } else if (!taskType.equals(other.taskType)) return false;
        if ( deadlines == null ) {
            if ( other.deadlines != null ) {

            }
        } else if ( !deadlines.equals( other.deadlines ) ) return false;
        if ( delegation == null ) {
            if ( other.delegation != null ) return false;
        } else if ( !delegation.equals( other.delegation ) ) return false;
        if ( peopleAssignments == null ) {
            if ( other.peopleAssignments != null ) return false;
        } else if ( !peopleAssignments.equals( other.peopleAssignments ) ) return false;

        if ( priority != other.priority ) return false;
        if ( taskData == null ) {
            if ( other.taskData != null ) return false;
        } else if ( !taskData.equals( other.taskData ) ) return false;
        return ( CollectionUtils.equals( descriptions, other.descriptions ) && CollectionUtils.equals( names, other.names )
        && CollectionUtils.equals( subjects, other.subjects ));
    }

    public SubTasksStrategy getSubTaskStrategy() {
        return subTaskStrategy;
    }

    public void setSubTaskStrategy(SubTasksStrategy subTaskStrategy) {
        this.subTaskStrategy = subTaskStrategy;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getSubject() {
        return subject;
    }

    public void setSubject(String subject) {
        this.subject = subject;
    }

    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        if (description != null && description.length() > TASK_DESCRIPTION_LENGTH) {
            description = description.substring(0, TASK_DESCRIPTION_LENGTH);
            logger.warn("Task Description content was trimmed as it was too long (more than {} characters)", TASK_DESCRIPTION_LENGTH);
        }
        this.description = description;
    }

    @Override
    public String toString() {
        return "TaskImpl [id=" + id + ", name=" + name + "]";
    }
  
}
