// Code scaffolded by goctl. Safe to edit.
// goctl 1.10.2

package systemlog

import (
	"context"

	"udeServer/internal/apierr"
	"udeServer/internal/audit"
	"udeServer/internal/log"
	"udeServer/internal/svc"
	"udeServer/internal/types"

	"github.com/zeromicro/go-zero/core/logx"
	"github.com/zeromicro/go-zero/core/stores/sqlx"
)

type LogAuditLogic struct {
	logx.Logger
	ctx    context.Context
	svcCtx *svc.ServiceContext
}

// 日志审计(校验Hmac防篡改)
func NewLogAuditLogic(ctx context.Context, svcCtx *svc.ServiceContext) *LogAuditLogic {
	return &LogAuditLogic{
		Logger: logx.WithContext(ctx),
		ctx:    ctx,
		svcCtx: svcCtx,
	}
}

// LogAudit recomputes the HMAC of the selected entries and marks each one
// as audited-passed or audited-anomaly.
func (l *LogAuditLogic) LogAudit(req *types.SystemLogAuditReq) (*types.SystemLogAuditResp, error) {
	if len(req.Idens) == 0 {
		return nil, apierr.BadRequest("idens 不能为空")
	}

	list, err := l.svcCtx.SystemLogModel.FindByIdens(l.ctx, req.Idens)
	if err != nil {
		log.RecordError(l.ctx, err)
		return nil, apierr.New(500, "查询日志失败")
	}

	// HMAC 密钥与写入时一致(来自 t_config.log_hmac_secret)
	_, logConfig := audit.GetGlobalConfig(l.svcCtx.ConfigModel)

	var invalidCount, validCount int64
	auditList := make([]types.AuditResult, 0, len(list))

	for i := range list {
		v := &list[i]
		auditResult := types.AuditResult{LogIden: v.Iden}
		macBuffer := make([]byte, 0, 32)

		mac, hErr := audit.CalculateHMAC(v, logConfig.HmacSecret, macBuffer)
		switch {
		case hErr != nil:
			log.RecordError(l.ctx, hErr)
			auditResult.Valid = false
			v.AuditStatus = audit.AuditedAnomaly
			auditResult.Reason = "HMAC计算失败"
		case v.HMac == mac:
			auditResult.Valid = true
			v.AuditStatus = audit.AuditedPassed
			validCount++
			auditList = append(auditList, auditResult)
			continue
		default:
			auditResult.Valid = false
			v.AuditStatus = audit.AuditedAnomaly
			auditResult.Reason = "HMAC不匹配,日志被篡改!"
			invalidCount++
			auditList = append(auditList, auditResult)
			continue
		}
		invalidCount++
		auditList = append(auditList, auditResult)
	}

	// 事务内逐条更新审计状态
	err = l.svcCtx.DB.TransactCtx(l.ctx, func(ctx context.Context, session sqlx.Session) error {
		for i := range list {
			if _, err := session.ExecCtx(ctx,
				"update t_system_log set audit_status = ? where id = ?",
				list[i].AuditStatus, list[i].Id); err != nil {
				return err
			}
		}
		return nil
	})
	if err != nil {
		log.RecordError(l.ctx, err)
		return nil, apierr.New(500, "更新审计状态失败")
	}

	resp := &types.SystemLogAuditResp{
		AuditResults: auditList,
		TotalCount:   int64(len(auditList)),
		ValidCount:   validCount,
		InValidCount: invalidCount,
	}
	log.RecordDebug(l.ctx, "日志审计完成!")
	return resp, nil
}