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.dto.AiPromptPreviewDto;
import com.vincent.rsf.server.ai.dto.AiPromptPreviewRequest;
import com.vincent.rsf.server.ai.entity.AiPrompt;
import com.vincent.rsf.server.ai.mapper.AiPromptMapper;
import com.vincent.rsf.server.ai.service.AiPromptService;
import com.vincent.rsf.server.system.enums.StatusType;
import lombok.RequiredArgsConstructor;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;

@Service("aiPromptService")
@RequiredArgsConstructor
public class AiPromptServiceImpl extends ServiceImpl<AiPromptMapper, AiPrompt> implements AiPromptService {

    private final AiPromptRenderSupport aiPromptRenderSupport;

    @Override
    public AiPrompt getActivePrompt(String code, Long tenantId) {
        ensureTenantId(tenantId);
        AiPrompt aiPrompt = this.getOne(new LambdaQueryWrapper<AiPrompt>()
                .eq(AiPrompt::getTenantId, tenantId)
                .eq(AiPrompt::getCode, code)
                .eq(AiPrompt::getStatus, StatusType.ENABLE.val)
                .eq(AiPrompt::getDeleted, 0)
                .last("limit 1"));
        if (aiPrompt == null) {
            throw new CoolException("未找到启用中的 Prompt：" + code);
        }
        return aiPrompt;
    }

    @Override
    public void validateBeforeSave(AiPrompt aiPrompt, Long tenantId) {
        ensureTenantId(tenantId);
        aiPrompt.setTenantId(tenantId);
        ensureRequiredFields(aiPrompt);
        ensureUniqueCode(aiPrompt.getCode(), tenantId, null);
    }

    @Override
    public void validateBeforeUpdate(AiPrompt aiPrompt, Long tenantId) {
        ensureTenantId(tenantId);
        if (aiPrompt.getId() == null) {
            throw new CoolException("Prompt ID 不能为空");
        }
        AiPrompt current = requireOwnedRecord(aiPrompt.getId(), tenantId);
        aiPrompt.setTenantId(current.getTenantId());
        ensureRequiredFields(aiPrompt);
        ensureUniqueCode(aiPrompt.getCode(), tenantId, aiPrompt.getId());
    }

    @Override
    public AiPromptPreviewDto renderPreview(AiPromptPreviewRequest request, Long tenantId) {
        ensureTenantId(tenantId);
        if (request == null) {
            throw new CoolException("Prompt 预览参数不能为空");
        }
        if (!StringUtils.hasText(request.getSystemPrompt())) {
            throw new CoolException("系统 Prompt 不能为空");
        }
        return aiPromptRenderSupport.render(
                request.getSystemPrompt(),
                request.getUserPromptTemplate(),
                request.getInput(),
                request.getMetadata()
        );
    }

    private void ensureRequiredFields(AiPrompt aiPrompt) {
        if (!StringUtils.hasText(aiPrompt.getName())) {
            throw new CoolException("Prompt 名称不能为空");
        }
        if (!StringUtils.hasText(aiPrompt.getCode())) {
            throw new CoolException("Prompt 编码不能为空");
        }
        if (!StringUtils.hasText(aiPrompt.getSystemPrompt())) {
            throw new CoolException("系统 Prompt 不能为空");
        }
        if (aiPrompt.getStatus() == null) {
            aiPrompt.setStatus(StatusType.ENABLE.val);
        }
    }

    private void ensureUniqueCode(String code, Long tenantId, Long selfId) {
        LambdaQueryWrapper<AiPrompt> wrapper = new LambdaQueryWrapper<AiPrompt>()
                .eq(AiPrompt::getTenantId, tenantId)
                .eq(AiPrompt::getCode, code)
                .eq(AiPrompt::getDeleted, 0);
        if (selfId != null) {
            wrapper.ne(AiPrompt::getId, selfId);
        }
        if (this.count(wrapper) > 0) {
            throw new CoolException("Prompt 编码已存在");
        }
    }

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

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