package ru.soune.nocopy.service.referral;

import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.jetbrains.annotations.NotNull;
import org.jetbrains.annotations.Nullable;
import org.springframework.data.domain.PageRequest;
import org.springframework.data.domain.Pageable;
import org.springframework.stereotype.Repository;
import org.springframework.transaction.annotation.Transactional;
import ru.soune.Referral;
import ru.soune.ReferralInvitee;
import ru.soune.ReferralRepo;
import ru.soune.nocopy.entity.user.User;
import ru.soune.nocopy.repository.ReferralJpaRepository;
import ru.soune.nocopy.repository.UserRepository;


import java.lang.reflect.Constructor;
import java.util.ArrayList;
import java.util.List;
import java.util.UUID;

@Repository
@RequiredArgsConstructor
@Slf4j
@Transactional
public class ReferralRepoImpl implements ReferralRepo {

    private final ReferralJpaRepository referralRepository;

    private final UserRepository userRepository;

    @Override
    public @NotNull String getUserReferralLink(long userId) {
        ru.soune.nocopy.entity.referral.Referral referral =
                referralRepository.findByUserId(userId);

        if (referral != null && referral.getReferralLink() != null &&
                !referral.getReferralLink().isEmpty()) {
            return referral.getReferralLink();
        }

        String newLink = "ref-" + userId + "-" + UUID.randomUUID().toString().substring(0, 8);

        if (referral == null) {
            referral = new ru.soune.nocopy.entity.referral.Referral();
            referral.setUserId(userId);
            referral.setLevelId("bronze");
            referral.setActive(false);
        }

        referral.setReferralLink(newLink);

        referralRepository.save(referral);

        return newLink;
    }

    @Override
    public @NotNull Long getUserIdByLink(@NotNull String link) {
        ru.soune.nocopy.entity.referral.Referral referral = referralRepository.findByReferralLink(link);
        return referral != null ? referral.getUserId() : 0L;
    }

    @Override
    public @Nullable Long getInviterIdForUser(long userId) {
        ru.soune.nocopy.entity.referral.Referral referral  = referralRepository.findByUserId(userId);
        return referral != null ? referral.getInviterId() : 0L;
    }

    @Override
    public @NotNull String getReferralLevelForUser(long userId) {
        ru.soune.nocopy.entity.referral.Referral referral = referralRepository.findByUserId(userId);
        return referral != null ? referral.getLevelId() : "";
    }

    @Override
    public @NotNull Referral getReferralByUserId(long userId) {
        ru.soune.nocopy.entity.referral.Referral entity = referralRepository.findByUserId(userId);

        if (entity == null) {
            return createDefaultReferral(userId);
        }

        return new Referral() {
            @Override
            public long getUserId() { return entity.getUserId(); }

            @Override
            public String getReferralLink() { return entity.getReferralLink(); }

            @Override
            public Long getInviter() {
                return entity.getInviterId() != null ? entity.getInviterId() : 0L;
            }

            @Override
            public String getCurrentLevel() { return entity.getLevelId(); }

            @Override
            public int getTotalIncome() { return entity.getTotalIncome(); }

            @Override
            public int getAvailableIncome() {
                Integer holdBalance = entity.getHoldBalance();
                return entity.getTotalIncome() - (holdBalance != null ? holdBalance : 0);
            }

            @Override
            public int getHoldBalance() {
                Integer holdBalance = entity.getHoldBalance();
                return holdBalance != null ? holdBalance : 0;
            }

            @Override
            public boolean getActive() { return entity.isActive(); }
        };
    }

    private Referral createDefaultReferral(long userId) {
        return new Referral() {
            @Override
            public long getUserId() { return userId; }

            @Override
            public String getReferralLink() { return ""; }

            @Override
            public Long getInviter() { return 0L; }

            @Override
            public String getCurrentLevel() { return "bronze"; }

            @Override
            public int getTotalIncome() { return 0; }

            @Override
            public int getAvailableIncome() { return 0; }

            @Override
            public int getHoldBalance() { return 0; }

            @Override
            public boolean getActive() { return false; }
        };
    }

    @Override
    public @NotNull List<ReferralInvitee> getReferralInvitees(long userId, int pageSize, int pageNumber) {
        Pageable pageable = PageRequest.of(pageNumber, pageSize);
        List<ru.soune.nocopy.entity.referral.Referral> referrals = referralRepository.findByInviterId(userId, pageable);

        List<ReferralInvitee> result = new ArrayList<>();

        for (ru.soune.nocopy.entity.referral.Referral referral : referrals) {
            User user = userRepository.findById(referral.getUserId()).orElse(null);

            String email = user != null ? user.getEmail() : "";
            boolean isActive = referral.isActive();
            String regDate = referral.getCreatedAt() != null ?
                    referral.getCreatedAt().toString() : "";

            try {
                Constructor<ReferralInvitee> constructor = ReferralInvitee.class.getDeclaredConstructor(
                        String.class, boolean.class, String.class
                );
                ReferralInvitee invitee = constructor.newInstance(email, isActive, regDate);
                result.add(invitee);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }

        return result;
    }

    @Override
    public void createReferralEntity(@NotNull Referral entity) {
        ru.soune.nocopy.entity.referral.Referral referral = new ru.soune.nocopy.entity.referral.Referral();
        referral.setUserId(entity.getUserId());
        referral.setReferralLink(entity.getReferralLink());
        referral.setInviterId(entity.getInviter());
        referral.setLevelId(entity.getCurrentLevel());
        referral.setTotalIncome(entity.getTotalIncome());
        referral.setHoldBalance(entity.getHoldBalance());
        referral.setActive(entity.getActive());

        referralRepository.save(referral);
    }

    @Override
    public void increaseIncome(long userId, int transferAmount) {
        referralRepository.increaseIncome(userId, transferAmount);
    }

    @Override
    public boolean activateUser(long userId) {
        try {
            referralRepository.activateUser(userId);
            return true;
        } catch (Exception e) {
            return false;
        }
    }

    @Override
    public int getActiveInviteeForUser(long userId) {
        return referralRepository.countActiveInvitees(userId);
    }

    @Override
    public int getTotalInviteeForUser(long userId) {
        return referralRepository.countTotalInvitees(userId);
    }

    @Override
    public void upgradeReferralLevelForUser(long userId, @NotNull String newLevelId) {
        referralRepository.updateLevel(userId, newLevelId);
    }
}