package nl.connectedit.swiss.domain.entity;

import jakarta.persistence.*;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Map;
import lombok.Getter;
import lombok.Setter;
import nl.connectedit.swiss.domain.EventType;
import nl.connectedit.swiss.domain.TournamentStatus;

import java.time.LocalDate;
import java.util.ArrayList;
import java.util.List;
import java.util.stream.Collectors;

@Entity
@Table
@Getter
@Setter
public class Tournament extends AbstractEntity {

    public Tournament() {
        initialize();
    }

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    private String name;

    private LocalDate date;

    @Enumerated(EnumType.STRING)
    private TournamentStatus status;

    @OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY)
    private List<Event> events;

    @OneToMany(cascade = CascadeType.ALL, fetch = FetchType.LAZY)
    private List<TournamentPlayer> tournamentPlayers;

    private Long maxEvents;

    @ElementCollection
    private List<Float> costsPerEvent;

    private Long courts;

    private Boolean active;

    public void initialize() {
        this.events = new ArrayList<>();
        this.events.addAll(Event.getBlankEventSet(this));
        this.status = TournamentStatus.UPCOMING;
    }

    public Event getEventByType(EventType type) {
        return events
            .stream()
            .filter(event -> event.getType().equals(type))
            .findFirst()
            .orElse(null);
    }

    public List<Registration> getRegistrations() {
        return events
            .stream()
            .map(Event::getRegistrations)
            .flatMap(List::stream)
            .collect(Collectors.toCollection(ArrayList::new));
    }

    public List<Player> getDrawnOutPlayers() {
        var drawnOutPlayers = new ArrayList<Player>();
        for (var event : events) {
            for (var group : event.getGroups()) {
                for (var round : group.getRounds()) {
                    var drawnOut = round.getDrawnOut();
                    if (drawnOut != null) {
                        drawnOutPlayers.add(drawnOut.getPlayer1());
                        if (drawnOut.getPlayer2() != null) {
                            drawnOutPlayers.add(drawnOut.getPlayer2());
                        }
                    }
                }
            }
        }
        return drawnOutPlayers;
    }

    public boolean hasPlayersDrawnOutMaxOnce() {
        var drawnOutPlayers = this.getDrawnOutPlayers();
        return drawnOutPlayers.size() == new HashSet<>(drawnOutPlayers).size();
    }

    public List<Player> getPlayersPlayingOnlyOneEvent() {
        var playerEvents = new HashMap<Player, List<EventType>>();
        for (var registration : getRegistrations()) {
            if (!playerEvents.containsKey(registration.getPlayer())) {
                playerEvents.put(registration.getPlayer(), new ArrayList<>());
            }
            playerEvents.get(registration.getPlayer()).add(registration.getEvent().getType());
        }
        return playerEvents.entrySet().stream()
          .filter(entry -> entry.getValue().size() == 1)
          .map(Map.Entry::getKey)
          .toList();
    }
}