package cn.iocoder.yudao.module.ai.service.model;

import cn.iocoder.yudao.framework.common.enums.CommonStatusEnum;
import cn.iocoder.yudao.framework.common.pojo.PageResult;
import cn.iocoder.yudao.framework.common.util.object.BeanUtils;
import cn.iocoder.yudao.module.ai.controller.admin.model.vo.model.AiModelPageReqVO;
import cn.iocoder.yudao.module.ai.controller.admin.model.vo.model.AiModelSaveReqVO;
import cn.iocoder.yudao.module.ai.controller.admin.model.vo.model.AiModelUpdateStatusReqVO;
import cn.iocoder.yudao.module.ai.dal.dataobject.model.AiApiKeyDO;
import cn.iocoder.yudao.module.ai.dal.dataobject.model.AiModelDO;
import cn.iocoder.yudao.module.ai.dal.mysql.model.AiModelMapper;
import cn.iocoder.yudao.module.ai.enums.model.AiModelCapabilityEnum;
import cn.iocoder.yudao.module.ai.enums.model.AiModelTypeEnum;
import cn.iocoder.yudao.module.ai.enums.model.AiPlatformEnum;
import cn.iocoder.yudao.module.ai.framework.ai.config.YudaoAiProperties;
import cn.iocoder.yudao.module.ai.framework.ai.core.model.AiModelFactory;
import jakarta.annotation.Resource;
import org.springframework.ai.chat.model.ChatModel;
import org.springframework.ai.embedding.EmbeddingModel;
import org.springframework.ai.vectorstore.VectorStore;
import org.springframework.ai.vectorstore.milvus.MilvusVectorStore;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.validation.annotation.Validated;
import java.util.List;
import java.util.Map;
import static cn.iocoder.yudao.framework.common.exception.util.ServiceExceptionUtil.exception;
import static cn.iocoder.yudao.module.ai.enums.ErrorCodeConstants.*;

@Service
@Validated
public class AiModelServiceImpl implements AiModelService {

    @Resource
    private AiApiKeyService apiKeyService;
    @Resource
    private AiModelMapper modelMapper;
    @Resource
    private AiModelFactory modelFactory;
    @Resource
    private YudaoAiProperties aiProperties;

    @Override
    @Transactional(rollbackFor = Exception.class)
    public Long createModel(AiModelSaveReqVO createReqVO) {
        AiPlatformEnum.validatePlatform(createReqVO.getPlatform());
        apiKeyService.validateApiKey(createReqVO.getKeyId());
        AiModelDO model = BeanUtils.toBean(createReqVO, AiModelDO.class);
        model.setCapability(resolveCapability(createReqVO.getCapability()));
        if (CommonStatusEnum.isEnable(model.getStatus())) {
            disableOtherEnabledModels(model);
        }
        modelMapper.insert(model);
        return model.getId();
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void updateModel(AiModelSaveReqVO updateReqVO) {
        AiModelDO existing = validateModelExists(updateReqVO.getId());
        AiPlatformEnum.validatePlatform(updateReqVO.getPlatform());
        apiKeyService.validateApiKey(updateReqVO.getKeyId());
        AiModelDO model = BeanUtils.toBean(updateReqVO, AiModelDO.class);
        // 未传能力时沿用原值，避免老前端提交把视觉模型降级成文本能力
        model.setCapability(resolveCapability(
                updateReqVO.getCapability() == null || updateReqVO.getCapability().isBlank()
                        ? existing.getCapability() : updateReqVO.getCapability()));
        if (CommonStatusEnum.isEnable(model.getStatus())) {
            disableOtherEnabledModels(model);
        }
        modelMapper.updateById(model);
    }

    @Override
    public void deleteModel(Long id) {
        validateModelExists(id);
        modelMapper.deleteById(id);
    }

    @Override
    public AiModelDO getModel(Long id) {
        return modelMapper.selectById(id);
    }

    @Override
    public AiModelDO getRequiredDefaultModel(Integer type) {
        return getRequiredDefaultModel(type, AiModelCapabilityEnum.defaultCapability());
    }

    @Override
    public AiModelDO getRequiredDefaultModel(Integer type, String capability) {
        AiModelDO model = modelMapper.selectFirstByTypeAndCapabilityAndStatus(
                type, resolveCapability(capability), CommonStatusEnum.ENABLE.getStatus());
        if (model == null) {
            throw exception(MODEL_NOT_ENABLED,
                    AiModelTypeEnum.getName(type), AiModelCapabilityEnum.getName(resolveCapability(capability)));
        }
        return model;
    }

    @Override
    public PageResult<AiModelDO> getModelPage(AiModelPageReqVO pageReqVO) {
        return modelMapper.selectPage(pageReqVO);
    }

    @Override
    @Transactional(rollbackFor = Exception.class)
    public void updateModelStatus(AiModelUpdateStatusReqVO updateReqVO) {
        AiModelDO model = validateModelExists(updateReqVO.getId());
        model.setStatus(updateReqVO.getStatus());
        if (CommonStatusEnum.isEnable(updateReqVO.getStatus())) {
            // 启用：自动关闭同「类型 + 能力」下的其他模型，保证同组只有一个启用
            disableOtherEnabledModels(model);
        }
        modelMapper.updateById(model);
    }

    @Override
    public AiModelDO validateModel(Long id) {
        AiModelDO model = validateModelExists(id);
        if (CommonStatusEnum.isDisable(model.getStatus())) throw exception(MODEL_DISABLE, model.getName());
        return model;
    }

    @Override
    public List<AiModelDO> getModelListByStatusAndType(Integer status, Integer type, String platform) {
        return modelMapper.selectListByStatusAndType(status, type, platform);
    }

    /**
     * 关闭同「类型 + 能力」下已启用的其他模型（不含自身）
     */
    private void disableOtherEnabledModels(AiModelDO model) {
        List<AiModelDO> sameGroup = modelMapper.selectListByTypeAndCapabilityAndStatus(
                model.getType(), resolveCapability(model.getCapability()), CommonStatusEnum.ENABLE.getStatus());
        for (AiModelDO other : sameGroup) {
            if (other.getId().equals(model.getId())) {
                continue;
            }
            AiModelDO update = new AiModelDO();
            update.setId(other.getId());
            update.setStatus(CommonStatusEnum.DISABLE.getStatus());
            modelMapper.updateById(update);
        }
    }

    private static String resolveCapability(String capability) {
        return capability == null || capability.isBlank()
                ? AiModelCapabilityEnum.defaultCapability() : capability;
    }

    private AiModelDO validateModelExists(Long id) {
        AiModelDO model = modelMapper.selectById(id);
        if (model == null) throw exception(MODEL_NOT_EXISTS);
        return model;
    }

    // ========== 与 Spring AI 集成 ==========

    @Override
    public ChatModel getChatModel(Long id) {
        AiModelDO model = validateModel(id);
        AiApiKeyDO apiKey = apiKeyService.validateApiKey(model.getKeyId());
        AiPlatformEnum platform = AiPlatformEnum.validatePlatform(apiKey.getPlatform());
        // temperature / maxTokens 是 AI 模型表上一直存在、却从没人读过的两列：
        // 不读 temperature，库里配的值对调用方是假的；不读 maxTokens，长输出会被静默截断
        return modelFactory.getOrCreateChatModel(platform, apiKey.getApiKey(), apiKey.getUrl(), model.getModel(),
                model.getTemperature(), model.getMaxTokens(), aiProperties.getTimeout());
    }

    @Override
    public VectorStore getOrCreateVectorStore(Long id, Map<String, Class<?>> metadataFields) {
        AiModelDO model = validateModel(id);
        AiApiKeyDO apiKey = apiKeyService.validateApiKey(model.getKeyId());
        AiPlatformEnum platform = AiPlatformEnum.validatePlatform(apiKey.getPlatform());

        EmbeddingModel embeddingModel = modelFactory.getOrCreateEmbeddingModel(
                platform, apiKey.getApiKey(), apiKey.getUrl(), model.getModel());

        return modelFactory.getOrCreateVectorStore(MilvusVectorStore.class, embeddingModel, metadataFields);
    }

}