package agent

import (
	"context"
	"encoding/hex"
	"encoding/json"
	"ycc-server/app/main/model"
	"ycc-server/common/ctxdata"
	"ycc-server/common/xerr"
	"ycc-server/pkg/lzkit/crypto"

	"github.com/pkg/errors"

	"ycc-server/app/main/api/internal/svc"
	"ycc-server/app/main/api/internal/types"

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

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

func NewOfflineFeatureLogic(ctx context.Context, svcCtx *svc.ServiceContext) *OfflineFeatureLogic {
	return &OfflineFeatureLogic{
		Logger: logx.WithContext(ctx),
		ctx:    ctx,
		svcCtx: svcCtx,
	}
}

func (l *OfflineFeatureLogic) OfflineFeature(req *types.OfflineFeatureReq) (resp *types.OfflineFeatureResp, err error) {
	// 1. 验证参数
	if err := l.validateRequest(req); err != nil {
		return nil, err
	}

	// 2. 获取用户ID并验证代理权限（任意等级代理均可下架）
	userID, err := l.verifyAgent()
	if err != nil {
		return nil, err
	}

	// 3. 获取查询记录和身份证号
	queryModel, idCard, err := l.getQueryInfo(req.QueryId)
	if err != nil {
		return nil, err
	}
	_ = queryModel // 避免未使用变量警告

	// 4. 调用 WhitelistService 统一下架处理
	needPay, amount, whitelistCreated, err := l.svcCtx.WhitelistService.ProcessOfflineFeature(
		l.ctx,
		nil, // 不使用事务，因为可能只是检查
		idCard,
		req.FeatureApiId,
		userID,
		req.QueryId,
	)
	if err != nil {
		return nil, err
	}

	// 5. 如果已创建白名单，需要删除报告数据
	if whitelistCreated {
		if err := l.deleteQueryData(req.QueryId, req.FeatureApiId); err != nil {
			// 删除报告数据失败不影响主流程，只记录日志
			logx.Errorf("下架模块后删除报告数据失败：查询记录 %s，模块 %s，错误：%v", req.QueryId, req.FeatureApiId, err)
		}
	}

	return &types.OfflineFeatureResp{
		Success: whitelistCreated,
		NeedPay: needPay,
		Amount:  amount,
	}, nil
}

// validateRequest 验证请求参数
func (l *OfflineFeatureLogic) validateRequest(req *types.OfflineFeatureReq) error {
	if req.QueryId == "" {
		return errors.Wrapf(xerr.NewErrMsg("查询记录ID不能为空"), "")
	}
	if req.FeatureApiId == "" {
		return errors.Wrapf(xerr.NewErrMsg("模块API标识不能为空"), "")
	}
	return nil
}

// verifyAgent 验证是否为代理并返回用户ID（任意等级代理均可下架）
func (l *OfflineFeatureLogic) verifyAgent() (string, error) {
	userID, err := ctxdata.GetUidFromCtx(l.ctx)
	if err != nil {
		return "", errors.Wrapf(xerr.NewErrCode(xerr.SERVER_COMMON_ERROR), "获取用户信息失败, %v", err)
	}

	_, err = l.svcCtx.AgentModel.FindOneByUserId(l.ctx, userID)
	if err != nil {
		if errors.Is(err, model.ErrNotFound) {
			return "", errors.Wrapf(xerr.NewErrMsg("您不是代理"), "")
		}
		return "", errors.Wrapf(xerr.NewErrCode(xerr.DB_ERROR), "查询代理信息失败, %v", err)
	}

	return userID, nil
}

// getQueryInfo 获取查询记录和身份证号
func (l *OfflineFeatureLogic) getQueryInfo(queryId string) (*model.Query, string, error) {
	queryModel, err := l.svcCtx.QueryModel.FindOne(l.ctx, queryId)
	if err != nil {
		if errors.Is(err, model.ErrNotFound) {
			return nil, "", errors.Wrapf(xerr.NewErrMsg("查询记录不存在"), "")
		}
		return nil, "", errors.Wrapf(xerr.NewErrCode(xerr.DB_ERROR), "查询报告记录失败, %v", err)
	}

	// 解密 QueryParams 获取 idCard
	idCard, err := l.extractIdCardFromQueryParams(queryModel)
	if err != nil {
		return nil, "", errors.Wrapf(xerr.NewErrCode(xerr.SERVER_COMMON_ERROR), "获取身份证号失败, %v", err)
	}

	if idCard == "" {
		return nil, "", errors.Wrapf(xerr.NewErrMsg("查询参数中缺少身份证号"), "")
	}

	return queryModel, idCard, nil
}

// extractIdCardFromQueryParams 从 QueryParams 中提取身份证号
func (l *OfflineFeatureLogic) extractIdCardFromQueryParams(queryModel *model.Query) (string, error) {
	if queryModel.QueryParams == "" {
		return "", errors.New("查询参数为空")
	}

	secretKey := l.svcCtx.Config.Encrypt.SecretKey
	key, decodeErr := hex.DecodeString(secretKey)
	if decodeErr != nil {
		return "", errors.Wrap(decodeErr, "获取AES密钥失败")
	}

	decryptedParams, decryptErr := crypto.AesDecrypt(queryModel.QueryParams, key)
	if decryptErr != nil {
		return "", errors.Wrap(decryptErr, "解密查询参数失败")
	}

	var params map[string]interface{}
	unmarshalErr := json.Unmarshal(decryptedParams, &params)
	if unmarshalErr != nil {
		return "", errors.Wrap(unmarshalErr, "解析查询参数失败")
	}

	idCard, ok := params["id_card"].(string)
	if !ok || idCard == "" {
		return "", errors.New("查询参数中缺少 id_card 或 id_card 为空")
	}

	return idCard, nil
}

// deleteQueryData 删除报告数据
func (l *OfflineFeatureLogic) deleteQueryData(queryId, featureApiId string) error {
	return l.svcCtx.QueryModel.Trans(l.ctx, func(ctx context.Context, session sqlx.Session) error {
		return l.svcCtx.WhitelistService.DeleteFeatureFromQueryData(ctx, session, queryId, featureApiId)
	})
}