package net.frozenorb.apiv3.models;

import com.google.common.collect.ImmutableMap;
import com.google.common.collect.ImmutableSet;
import lombok.Getter;
import lombok.Setter;
import net.frozenorb.apiv3.APIv3;
import net.frozenorb.apiv3.serialization.ExcludeFromReplies;
import net.frozenorb.apiv3.utils.TimeUtils;
import org.bson.Document;
import org.mindrot.jbcrypt.BCrypt;
import org.mongodb.morphia.annotations.Entity;
import org.mongodb.morphia.annotations.Id;

import java.util.*;

@Entity(value = "users", noClassnameStored = true)
public final class User {

    @Getter @Id private UUID id;
    @Getter private String lastUsername;
    @Getter @ExcludeFromReplies private Map<String, Date> aliases;
    @Getter @ExcludeFromReplies private String otpCode;
    @Getter @ExcludeFromReplies @Setter private String emailToken;
    @Getter @ExcludeFromReplies @Setter private Date emailTokenSet;
    @Getter @ExcludeFromReplies private String password;
    @Getter @Setter private String email;
    @Getter private int phoneNumber;
    @Getter private String lastSeenOn;
    @Getter private Date lastSeenAt;
    @Getter private Date firstSeen;

    public static User byId(String id) {
        try {
            return byId(UUID.fromString(id));
        } catch (Exception ex) {
            throw new IllegalArgumentException("Invalid UUID string " + id, ex);
        }
    }

    public static User byId(UUID id) {
        return APIv3.getDatastore().createQuery(User.class).field("id").equal(id).get();
    }

    public static User byEmailToken(String name) {
        return APIv3.getDatastore().createQuery(User.class).field("emailToken").equal(name).get();
    }

    @Deprecated
    public static User byLastUsername(String lastUsername) {
        return APIv3.getDatastore().createQuery(User.class).field("lastUsername").equal(lastUsername).get();
    }

    public User() {} // For Morphia

    public User(UUID id, String lastUsername) {
        this.id = id;
        this.lastUsername = lastUsername;
        this.aliases = new HashMap<>();
        this.otpCode = null;
        this.password = null;
        this.email = null;
        this.phoneNumber = -1;
        this.lastSeenOn = null;
        this.lastSeenAt = new Date();
        this.firstSeen = new Date();

        aliases.put(lastUsername, new Date());
    }

    public boolean hasPermissionScoped(String permission, ServerGroup scope) {
        Map<String, Boolean> permissions = scope.calculatePermissions(getHighestRank(scope));
        return permissions.containsKey(permission) && permissions.get(permission);
    }

    // TODO
    public boolean hasPermissionAnywhere(String permission) {
        Map<String, Boolean> permissions = /*scope.calculatePermissions(getHighestRank(scope));*/ ImmutableMap.of();
        return permissions.containsKey(permission) && permissions.get(permission);
    }

    public List<Grant> getGrants() {
        return APIv3.getDatastore().createQuery(Grant.class).field("target").equal(id).asList();
    }

    public List<IPLogEntry> getIPLog() {
        return APIv3.getDatastore().createQuery(IPLogEntry.class).field("user").equal(id).asList();
    }

    public IPLogEntry getIPLogEntry(String ip) {
        IPLogEntry existing = APIv3.getDatastore().createQuery(IPLogEntry.class).field("user").equal(id).field("ip").equal(ip).get();

        if (existing == null) {
            existing = new IPLogEntry(this, ip);
            APIv3.getDatastore().save(existing);
        }

        return existing;
    }

    public List<Punishment> getPunishments() {
        return APIv3.getDatastore().createQuery(Punishment.class).field("target").equal(id).asList();
    }

    public List<Punishment> getPunishments(Collection<Punishment.PunishmentType> types) {
        return APIv3.getDatastore().createQuery(Punishment.class).field("target").equal(id).field("type").in(types).asList();
    }

    public UserMetaEntry getMeta(ServerGroup group) {
        return APIv3.getDatastore().createQuery(UserMetaEntry.class).field("user").equal(id).field("serverGroup").equalIgnoreCase(group.getId()).get();
    }

    public void saveMeta(ServerGroup group, Document data) {
        UserMetaEntry entry = getMeta(group);

        if (entry == null) {
            APIv3.getDatastore().save(new UserMetaEntry(this, group, data));
        } else {
            entry.setData(data);
            APIv3.getDatastore().save(entry);
        }
    }

    public void seenOnServer(Server server) {
        this.lastSeenOn = server.getId();
        this.lastSeenAt = new Date();
    }

    public void setPassword(char[] unencrypted) {
        this.password = BCrypt.hashpw(new String(unencrypted), BCrypt.gensalt());
    }

    public boolean checkPassword(char[] unencrypted) {
        return BCrypt.checkpw(new String(unencrypted), password);
    }

    public Rank getHighestRank(ServerGroup serverGroup) {
        Rank highest = null;

        for (Grant grant : getGrants()) {
            if (!grant.isActive() || (serverGroup != null && !grant.appliesOn(serverGroup))) {
                continue;
            }

            Rank rank = Rank.byId(grant.getRank());

            if (highest == null || rank.getWeight() > highest.getWeight()) {
                highest = rank;
            }
        }

        if (highest != null) {
            return highest;
        } else {
            return Rank.byId("default");
        }
    }

    public Rank getHighestRank() {
        return getHighestRank(null);
    }

    public Map<String, Object> getLoginInfo(Server server) {
        String accessDenialReason = null;

        for (Punishment punishment : getPunishments(ImmutableSet.of(
                Punishment.PunishmentType.BLACKLIST,
                Punishment.PunishmentType.BAN
        ))) {
            if (!punishment.isActive()) {
                continue;
            }

            if (punishment.getType() == Punishment.PunishmentType.BLACKLIST) {
                accessDenialReason = "Your account has been blacklisted from the MineHQ Network. \n\nThis type of punishment cannot be appealed.";
            } else {
                accessDenialReason = "Your account has been suspended from the MineHQ Network. \n\n";

                if (punishment.getExpiresAt() != null) {
                    accessDenialReason += "Expires in " + TimeUtils.formatIntoDetailedString(TimeUtils.getSecondsBetween(punishment.getExpiresAt(), new Date()));
                } else {
                    accessDenialReason += "Appeal at MineHQ.com/appeal";
                }
            }
        }


        ServerGroup actorGroup = ServerGroup.byId(server.getGroup());
        Rank rank = getHighestRank(actorGroup);
        Map<String, Boolean> rankPermissions = actorGroup.calculatePermissions(rank);

        return ImmutableMap.of(
                "user", this,
                "access", ImmutableMap.of(
                        "allowed", accessDenialReason == null,
                        "reason", accessDenialReason == null ? "Public server" : accessDenialReason
                ),
                "rank", rank,
                "permissions", rankPermissions
        );
    }

}