package com.xuqm.im.service;

import com.xuqm.im.entity.ImConversationStateEntity;
import com.xuqm.im.repository.ImConversationStateRepository;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.time.LocalDateTime;
import java.util.Collection;
import java.util.List;
import java.util.UUID;

@Service
public class ConversationStateService {

    private final ImConversationStateRepository repository;

    public ConversationStateService(ImConversationStateRepository repository) {
        this.repository = repository;
    }

    @Transactional
    public ImConversationStateEntity setPinned(String appId, String userId, String targetId, String chatType, boolean pinned) {
        ImConversationStateEntity state = getOrCreate(appId, userId, targetId, chatType);
        state.setPinned(pinned);
        touch(state);
        return repository.save(state);
    }

    @Transactional
    public ImConversationStateEntity setMuted(String appId, String userId, String targetId, String chatType, boolean muted) {
        ImConversationStateEntity state = getOrCreate(appId, userId, targetId, chatType);
        state.setMuted(muted);
        touch(state);
        return repository.save(state);
    }

    @Transactional
    public ImConversationStateEntity markRead(String appId, String userId, String targetId, String chatType) {
        ImConversationStateEntity state = getOrCreate(appId, userId, targetId, chatType);
        state.setLastReadAt(LocalDateTime.now());
        state.setHidden(false);
        touch(state);
        return repository.save(state);
    }

    @Transactional
    public ImConversationStateEntity setDraft(String appId, String userId, String targetId, String chatType, String draft) {
        ImConversationStateEntity state = getOrCreate(appId, userId, targetId, chatType);
        state.setDraft(draft);
        touch(state);
        return repository.save(state);
    }

    @Transactional
    public ImConversationStateEntity hideConversation(String appId, String userId, String targetId, String chatType) {
        ImConversationStateEntity state = getOrCreate(appId, userId, targetId, chatType);
        state.setHidden(true);
        state.setDraft(null);
        touch(state);
        return repository.save(state);
    }

    @Transactional
    public void deleteConversationState(String appId, String userId, String targetId, String chatType) {
        repository.deleteByAppIdAndUserIdAndTargetIdAndChatType(appId, userId, targetId, chatType);
    }

    @Transactional
    public void deleteConversation(String appId,
                                   String userId,
                                   String targetId,
                                   String chatType,
                                   boolean syncAcrossClients) {
        if (syncAcrossClients) {
            deleteConversationState(appId, userId, targetId, chatType);
            return;
        }
        hideConversation(appId, userId, targetId, chatType);
    }

    @Transactional
    public void clearHiddenForUsers(String appId, String targetId, String chatType, Collection<String> userIds) {
        for (String userId : userIds) {
            ImConversationStateEntity state = repository
                    .findByAppIdAndUserIdAndTargetIdAndChatType(appId, userId, targetId, chatType)
                    .orElse(null);
            if (state != null && state.isHidden()) {
                state.setHidden(false);
                touch(state);
                repository.save(state);
            }
        }
    }

    public ImConversationStateEntity getOrCreate(String appId, String userId, String targetId, String chatType) {
        return repository.findByAppIdAndUserIdAndTargetIdAndChatType(appId, userId, targetId, chatType)
                .orElseGet(() -> {
                    ImConversationStateEntity entity = new ImConversationStateEntity();
                    entity.setId(UUID.randomUUID().toString());
                    entity.setAppId(appId);
                    entity.setUserId(userId);
                    entity.setTargetId(targetId);
                    entity.setChatType(chatType);
                    entity.setPinned(false);
                    entity.setMuted(false);
                    entity.setHidden(false);
                    entity.setDraft(null);
                    entity.setLastReadAt(null);
                    entity.setCreatedAt(LocalDateTime.now());
                    entity.setUpdatedAt(LocalDateTime.now());
                    return entity;
                });
    }

    public ImConversationStateEntity find(String appId, String userId, String targetId, String chatType) {
        return repository.findByAppIdAndUserIdAndTargetIdAndChatType(appId, userId, targetId, chatType)
                .orElse(null);
    }

    public List<ImConversationStateEntity> listVisible(String appId, String userId) {
        return repository.findByAppIdAndUserIdAndHiddenFalse(appId, userId);
    }

    private void touch(ImConversationStateEntity entity) {
        entity.setUpdatedAt(LocalDateTime.now());
    }
}