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package ee.tlu.htk.dippler.entities;

import java.io.Serializable;
import java.util.Date;
import javax.persistence.Basic;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.Lob;
import javax.persistence.ManyToOne;
import javax.persistence.NamedQueries;
import javax.persistence.NamedQuery;
import javax.persistence.Table;
import javax.persistence.TableGenerator;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;
import javax.persistence.Transient;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;

/**
 *
 * @author metz
 */
@XmlRootElement
@Entity
@Table(name = "answer")
@NamedQueries({
    @NamedQuery(name = "Answer.findAll", query = "SELECT a FROM Answer a"),
    @NamedQuery(name = "Answer.findById", query = "SELECT a FROM Answer a WHERE a.id = :id"),
    @NamedQuery(name = "Answer.findByUrl", query = "SELECT a FROM Answer a WHERE a.url = :url"),
    @NamedQuery(name = "Answer.findByTitle", query = "SELECT a FROM Answer a WHERE a.title = :title"),
    @NamedQuery(name = "Answer.findByAssignment", query = "SELECT a FROM Answer a WHERE a.assignment = :assignment"),
    @NamedQuery(name = "Answer.findByCreated", query = "SELECT a FROM Answer a WHERE a.created = :created"),
    @NamedQuery(name = "Answer.findByModified", query = "SELECT a FROM Answer a WHERE a.modified = :modified"),
    @NamedQuery(name = "Answer.findByCourse", query = "SELECT a FROM Answer a WHERE a.assignment.course = :course")})
public class Answer implements Serializable {
    private static final long serialVersionUID = 1L;
    
    @Id
    @GeneratedValue(generator = "AnswerID")
    @TableGenerator(name="AnswerID", table="id_gen", 
            pkColumnName="ID_NAME", 
            valueColumnName = "ID_VAL",
            pkColumnValue="LAST_ANSWER",
            allocationSize=1)
    @Basic(optional = false)
    @Column( name = "id" )
 
    private Long id;

    @Basic(optional = false)
    @Column(name = "url")
    private String url = "";

    @Column(name = "title")
    private String title;

    @Basic(optional = false)
    @Lob
    @Column(name = "content")
    private String content;

    @Basic(optional = true)
    @Lob
    @Column(name = "backup")
    private String backup;

    @Basic(optional = false)
    @Column(name = "created")
    @Temporal(TemporalType.TIMESTAMP)
    private Date created;

    @JoinColumn(name = "creator", referencedColumnName = "id")
    @ManyToOne(optional = false, fetch = FetchType.LAZY)
    private User creator;

    @Transient
    @XmlElement(name="learner-id")
    private Long learnerId;

    @Basic(optional = false)
    @Column(name = "modified")
    @Temporal(TemporalType.TIMESTAMP)
    private Date modified;
    
    @Basic(optional = false)
    @Column(name = "graded")
    @Temporal(TemporalType.TIMESTAMP)
    private Date graded;

    @JoinColumn(name = "assignment", referencedColumnName = "id")
    @ManyToOne(optional = false)
    private Assignment assignment;

    @Transient
    @XmlElement(name="assignment-id")
    private Long assignmentId;

    @Basic(optional = true)
    @Column(name = "grade")
    private int grade;

    @Basic(optional = true)
    @Lob
    @Column(name = "feedback")
    private String feedback;

    public Answer() {
    }

    public Answer(Long id) {
        this.id = id;
    }

    public Answer(Long id, String url, String content, Date created, Date modified, Date graded) {
        this.id = id;
        this.url = url;
        this.content = content;
        this.created = created;
        this.modified = modified;
        this.graded = graded;
    }

    public Long getId() {
        return id;
    }

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

    public String getUrl() {
        return url;
    }

    public void setUrl(String url) {
        this.url = url;
    }

    public String getTitle() {
        return title;
    }

    public void setTitle(String title) {
        this.title = title;
    }

    public String getContent() {
        return content;
    }

    public void setContent(String content) {
        this.content = content;
    }

    public String getBackup() {
        return backup;
    }

    public void setBackup(String backup) {
        this.backup = backup;
    }

    public Date getCreated() {
        return created;
    }

    public void setCreated(Date created) {
        this.created = created;
    }

    public User getCreator() {
        return creator;
    }

    public void setCreator(User user) {
        this.creator = user;
    }

    public Long getLearnerId() {
        return learnerId;
    }

    public Date getModified() {
        return modified;
    }

    public void setModified(Date modified) {
        this.modified = modified;
    }

    public Date getGraded() {
        return graded;
    }

    public void setGraded(Date graded) {
        this.graded = graded;
    }

    public Assignment getAssignment() {
        return assignment;
    }

    public void setAssignment(Assignment assignemnt) {
        this.assignment = assignemnt;
        //Bi-directional answer add to Set
        if (!assignment.getAnswers().contains(this)) {
            assignment.addAnswer(this);
        }
    }

    public Long getAssignmentId() {
        return assignmentId;
    }

    public Integer getGrade() {
        return grade;
    }

    public void setGrade(Integer grade) {
        this.grade = grade;
    }

    public String getFeedback() {
        return feedback;
    }

    public void setFeedback(String feedback) {
        this.feedback = feedback;
    }
    
    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || !(o instanceof Answer))
            return false;

        Answer other = (Answer)o;

        if (id == other.getId()) return true;
        if (id == null) return false;

        // equivalence by id
        return id.equals(other.getId());
    }

    @Override
    public int hashCode() {
        if (id != null) {
            return id.hashCode();
        } else {
            return super.hashCode();
        }
    }

    @Override
    public String toString() {
        return "ee.tlu.htk.dippler.entities.Answer[id=" + id + "]";
    }

}