package ru.ulstu.grant.model;

import org.hibernate.annotations.Fetch;
import org.hibernate.annotations.FetchMode;
import org.hibernate.validator.constraints.NotBlank;
import ru.ulstu.core.model.BaseEntity;
import ru.ulstu.core.model.UserContainer;
import ru.ulstu.deadline.model.Deadline;
import ru.ulstu.file.model.FileData;
import ru.ulstu.paper.model.Paper;
import ru.ulstu.project.model.Project;
import ru.ulstu.timeline.model.Event;
import ru.ulstu.user.model.User;

import javax.persistence.CascadeType;
import javax.persistence.Entity;
import javax.persistence.EnumType;
import javax.persistence.Enumerated;
import javax.persistence.FetchType;
import javax.persistence.JoinColumn;
import javax.persistence.JoinTable;
import javax.persistence.ManyToMany;
import javax.persistence.ManyToOne;
import javax.persistence.OneToMany;
import javax.persistence.OrderBy;
import javax.persistence.Table;
import javax.validation.constraints.NotNull;
import java.util.ArrayList;
import java.util.Comparator;
import java.util.Date;
import java.util.HashSet;
import java.util.List;
import java.util.Optional;
import java.util.Set;

@Entity
@Table(name = "grants")
public class Grant extends BaseEntity implements UserContainer {
    public enum GrantStatus {
        APPLICATION("Заявка"),
        ON_COMPETITION("Отправлен на конкурс"),
        SUCCESSFUL_PASSAGE("Успешное прохождение"),
        IN_WORK("В работе"),
        COMPLETED("Завершен"),
        FAILED("Провалены сроки"),
        LOADED_FROM_KIAS("Загружен автоматически"),
        SKIPPED("Не интересует");

        private String statusName;

        GrantStatus(String statusName) {
            this.statusName = statusName;
        }

        public String getStatusName() {
            return statusName;
        }
    }

    @NotBlank
    private String title;

    @Enumerated(value = EnumType.STRING)
    private GrantStatus status = GrantStatus.APPLICATION;

    @OneToMany(cascade = CascadeType.ALL, fetch = FetchType.EAGER)
    @JoinColumn(name = "grant_id")
    @OrderBy("date")
    private List<Deadline> deadlines = new ArrayList<>();

    private String comment;

    @OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY)
    @JoinColumn(name = "grant_id", unique = true)
    @Fetch(FetchMode.SUBSELECT)
    private List<FileData> files = new ArrayList<>();

    @ManyToOne(cascade = CascadeType.ALL)
    @JoinColumn(name = "project_id")
    private Project project;

    @ManyToMany(fetch = FetchType.EAGER)
    private Set<User> authors = new HashSet<>();

    @NotNull
    @ManyToOne
    @JoinColumn(name = "leader_id")
    private User leader;

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

    @OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY)
    @JoinColumn(name = "grant_id")
    private List<Event> events = new ArrayList<>();

    public GrantStatus getStatus() {
        return status;
    }

    public void setStatus(GrantStatus status) {
        this.status = status;
    }

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

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

    public String getComment() {
        return comment;
    }

    public void setComment(String comment) {
        this.comment = comment;
    }

    public List<FileData> getFiles() {
        return files;
    }

    public void setFiles(List<FileData> files) {
        this.files = files;
    }

    public String getTitle() {
        return title;
    }

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

    public Project getProject() {
        return project;
    }

    public void setProject(Project project) {
        this.project = project;
    }

    public Set<User> getAuthors() {
        return authors;
    }

    public void setAuthors(Set<User> authors) {
        this.authors = authors;
    }

    @Override
    public Set<User> getUsers() {
        return getAuthors();
    }

    public User getLeader() {
        return leader;
    }

    public void setLeader(User leader) {
        this.leader = leader;
    }

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

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

    public List<Event> getEvents() {
        return events;
    }

    public void setEvents(List<Event> events) {
        this.events = events;
    }

    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();
    }
}