package com.vincent.rsf.server.ai.service.impl;

import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.vincent.rsf.framework.exception.CoolException;
import com.vincent.rsf.server.ai.config.AiDefaults;
import com.vincent.rsf.server.ai.dto.AiParamValidateResultDto;
import com.vincent.rsf.server.ai.entity.AiParam;
import com.vincent.rsf.server.ai.mapper.AiParamMapper;
import com.vincent.rsf.server.ai.service.AiParamService;
import com.vincent.rsf.server.system.enums.StatusType;
import lombok.RequiredArgsConstructor;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;

import java.text.SimpleDateFormat;
import java.util.Date;

@Service("aiParamService")
@RequiredArgsConstructor
public class AiParamServiceImpl extends ServiceImpl<AiParamMapper, AiParam> implements AiParamService {

    private final AiParamValidationSupport aiParamValidationSupport;

    @Override
    public AiParam getActiveParam(Long tenantId) {
        ensureTenantId(tenantId);
        AiParam aiParam = this.getOne(new LambdaQueryWrapper<AiParam>()
                .eq(AiParam::getTenantId, tenantId)
                .eq(AiParam::getStatus, StatusType.ENABLE.val)
                .eq(AiParam::getDeleted, 0)
                .last("limit 1"));
        if (aiParam == null) {
            throw new CoolException("未找到启用中的 AI 参数配置");
        }
        return aiParam;
    }

    @Override
    public void validateBeforeSave(AiParam aiParam, Long tenantId) {
        ensureTenantId(tenantId);
        aiParam.setTenantId(tenantId);
        fillDefaults(aiParam);
        ensureBaseFields(aiParam);
        ensureSingleActive(tenantId, null, aiParam.getStatus());
        applyValidation(aiParam);
    }

    @Override
    public void validateBeforeUpdate(AiParam aiParam, Long tenantId) {
        ensureTenantId(tenantId);
        fillDefaults(aiParam);
        if (aiParam.getId() == null) {
            throw new CoolException("AI 参数 ID 不能为空");
        }
        AiParam current = requireOwnedRecord(aiParam.getId(), tenantId);
        aiParam.setTenantId(current.getTenantId());
        ensureBaseFields(aiParam);
        ensureSingleActive(tenantId, aiParam.getId(), aiParam.getStatus());
        applyValidation(aiParam);
    }

    @Override
    public AiParamValidateResultDto validateDraft(AiParam aiParam, Long tenantId) {
        ensureTenantId(tenantId);
        fillDefaults(aiParam);
        ensureBaseFields(aiParam);
        return aiParamValidationSupport.validate(aiParam);
    }

    private void ensureBaseFields(AiParam aiParam) {
        if (!StringUtils.hasText(aiParam.getName())) {
            throw new CoolException("AI 参数名称不能为空");
        }
        if (!StringUtils.hasText(aiParam.getProviderType())) {
            aiParam.setProviderType(AiDefaults.PROVIDER_OPENAI_COMPATIBLE);
        }
        if (!StringUtils.hasText(aiParam.getBaseUrl())) {
            throw new CoolException("AI Base URL 不能为空");
        }
        if (!StringUtils.hasText(aiParam.getApiKey())) {
            throw new CoolException("AI API Key 不能为空");
        }
        if (!StringUtils.hasText(aiParam.getModel())) {
            throw new CoolException("AI 模型不能为空");
        }
    }

    private void ensureSingleActive(Long tenantId, Long selfId, Integer status) {
        if (status == null || status != StatusType.ENABLE.val) {
            return;
        }
        LambdaQueryWrapper<AiParam> wrapper = new LambdaQueryWrapper<AiParam>()
                .eq(AiParam::getTenantId, tenantId)
                .eq(AiParam::getStatus, StatusType.ENABLE.val)
                .eq(AiParam::getDeleted, 0);
        if (selfId != null) {
            wrapper.ne(AiParam::getId, selfId);
        }
        if (this.count(wrapper) > 0) {
            throw new CoolException("同一租户仅允许一条启用中的 AI 参数配置");
        }
    }

    private AiParam requireOwnedRecord(Long id, Long tenantId) {
        AiParam aiParam = this.getOne(new LambdaQueryWrapper<AiParam>()
                .eq(AiParam::getId, id)
                .eq(AiParam::getTenantId, tenantId)
                .eq(AiParam::getDeleted, 0)
                .last("limit 1"));
        if (aiParam == null) {
            throw new CoolException("AI 参数不存在或无权访问");
        }
        return aiParam;
    }

    private void ensureTenantId(Long tenantId) {
        if (tenantId == null) {
            throw new CoolException("当前租户不存在");
        }
    }

    private void fillDefaults(AiParam aiParam) {
        if (!StringUtils.hasText(aiParam.getProviderType())) {
            aiParam.setProviderType(AiDefaults.PROVIDER_OPENAI_COMPATIBLE);
        }
        if (aiParam.getTemperature() == null) {
            aiParam.setTemperature(AiDefaults.DEFAULT_TEMPERATURE);
        }
        if (aiParam.getTopP() == null) {
            aiParam.setTopP(AiDefaults.DEFAULT_TOP_P);
        }
        if (aiParam.getTimeoutMs() == null) {
            aiParam.setTimeoutMs(AiDefaults.DEFAULT_TIMEOUT_MS);
        }
        if (aiParam.getStreamingEnabled() == null) {
            aiParam.setStreamingEnabled(Boolean.TRUE);
        }
        if (!StringUtils.hasText(aiParam.getValidateStatus())) {
            aiParam.setValidateStatus(AiDefaults.PARAM_VALIDATE_NOT_TESTED);
        }
        if (aiParam.getStatus() == null) {
            aiParam.setStatus(StatusType.ENABLE.val);
        }
    }

    private void applyValidation(AiParam aiParam) {
        AiParamValidateResultDto validateResult = aiParamValidationSupport.validate(aiParam);
        aiParam.setValidateStatus(validateResult.getStatus());
        aiParam.setLastValidateMessage(validateResult.getMessage());
        aiParam.setLastValidateElapsedMs(validateResult.getElapsedMs());
        aiParam.setLastValidateTime(parseDate(validateResult.getValidatedAt()));
        if (!AiDefaults.PARAM_VALIDATE_VALID.equals(validateResult.getStatus())) {
            throw new CoolException(validateResult.getMessage());
        }
    }

    private Date parseDate(String dateTime) {
        if (!StringUtils.hasText(dateTime)) {
            return null;
        }
        try {
            return new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").parse(dateTime);
        } catch (Exception e) {
            throw new CoolException("解析校验时间失败: " + e.getMessage());
        }
    }
}