package ru.ulstu.conference.model;

import org.hibernate.annotations.Fetch;
import org.hibernate.annotations.FetchMode;
import org.hibernate.validator.constraints.NotBlank;
import org.springframework.format.annotation.DateTimeFormat;
import ru.ulstu.core.model.BaseEntity;
import ru.ulstu.deadline.model.Deadline;
import ru.ulstu.paper.model.Paper;

import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.JoinColumn;
import javax.persistence.JoinTable;
import javax.persistence.ManyToMany;
import javax.persistence.OneToMany;
import javax.persistence.OrderBy;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;
import java.util.ArrayList;
import java.util.Comparator;
import java.util.Date;
import java.util.List;
import java.util.Optional;

@Entity
@Table(name = "conference")
public class Conference extends BaseEntity {

    @NotBlank
    private String title;

    private String description;

    private String url;

    private int ping = 0;

    @Column(name = "begin_date")
    @Temporal(TemporalType.TIMESTAMP)
    @DateTimeFormat(pattern = "yyyy-MM-dd")
    private Date beginDate;

    @Column(name = "end_date")
    @Temporal(TemporalType.TIMESTAMP)
    @DateTimeFormat(pattern = "yyyy-MM-dd")
    private Date endDate;

    @OneToMany(cascade = CascadeType.ALL, fetch = FetchType.EAGER)
    @JoinColumn(name = "conference_id", unique = true)
    @Fetch(FetchMode.SUBSELECT)
    @OrderBy("date")
    private List<Deadline> deadlines = new ArrayList<>();

    @ManyToMany(cascade = CascadeType.MERGE, fetch = FetchType.EAGER)
    @JoinTable(name = "paper_conference",
            joinColumns = {@JoinColumn(name = "conference_id")},
            inverseJoinColumns = {@JoinColumn(name = "paper_id")})
    @Fetch(FetchMode.SUBSELECT)
    private List<Paper> papers = new ArrayList<>();

    @OneToMany(cascade = CascadeType.ALL, fetch = FetchType.EAGER)
    @JoinColumn(name = "conference_id", unique = true)
    @Fetch(FetchMode.SUBSELECT)
    private List<ConferenceUser> users = new ArrayList<>();

    public String getTitle() {
        return title;
    }

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

    public String getDescription() {
        return description;
    }

    public void setDescription(String description) {
        this.description = description;
    }

    public String getUrl() {
        return url;
    }

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

    public int getPing() {
        return ping;
    }

    public void setPing(int ping) {
        this.ping = ping;
    }

    public Date getBeginDate() {
        return beginDate;
    }

    public void setBeginDate(Date beginDate) {
        this.beginDate = beginDate;
    }

    public Date getEndDate() {
        return endDate;
    }

    public void setEndDate(Date endDate) {
        this.endDate = endDate;
    }

    public List<Deadline> getDeadlines() {
        return deadlines;
    }

    public void setDeadlines(List<Deadline> deadlines) {
        this.deadlines = deadlines;
    }

    public List<Paper> getPapers() {
        return papers;
    }

    public void setPapers(List<Paper> papers) {
        this.papers = papers;
    }

    public List<ConferenceUser> getUsers() {
        return users;
    }

    public void setUsers(List<ConferenceUser> users) {
        this.users = users;
    }

    public Optional<Deadline> getNextDeadline() {
        return deadlines
                .stream()
                .filter(deadline -> deadline.getDate() != null)
                .sorted(Comparator.comparing(Deadline::getDate))
                .filter(d -> d.getDate().after(new Date()))
                .findFirst();
    }
}