package member

import (
	"context"

	"perms-system-server/internal/middleware"
	"perms-system-server/internal/response"
	"perms-system-server/internal/svc"
	"perms-system-server/internal/types"
	"perms-system-server/internal/util"

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

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

// userDisplay 审计 L-R18-4：把 MemberList 里原先用的匿名 `struct{ Username, Nickname string }`
// 具名化。匿名类型每次构造都要重新推导，IDE 跳转 / pprof 看到的类型字符串形如
// `struct{Username string; Nickname string}`，排障时难以按类型名反查用途；具名后一目了然。
type userDisplay struct {
	Username string
	Nickname string
}

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

// MemberList 成员列表。按产品分页查询成员信息，包含用户名、昵称和成员类型，用于产品成员管理页面。
func (l *MemberListLogic) MemberList(req *types.MemberListReq) (resp *types.PageResp, err error) {
	page, pageSize := util.NormalizePage(req.Page, req.PageSize)

	caller := middleware.GetUserDetails(l.ctx)
	if caller == nil {
		return nil, response.ErrUnauthorized("未登录")
	}
	if !caller.IsSuperAdmin && caller.ProductCode != req.ProductCode {
		return nil, response.ErrForbidden("无权访问该产品的数据")
	}

	list, total, err := l.svcCtx.SysProductMemberModel.FindListByProductCode(l.ctx, req.ProductCode, page, pageSize)
	if err != nil {
		return nil, err
	}

	userIds := make([]int64, 0, len(list))
	for _, m := range list {
		userIds = append(userIds, m.UserId)
	}

	users, err := l.svcCtx.SysUserModel.FindByIds(l.ctx, userIds)
	if err != nil {
		return nil, err
	}
	userMap := make(map[int64]userDisplay, len(users))
	for _, u := range users {
		userMap[u.Id] = userDisplay{Username: u.Username, Nickname: u.Nickname}
	}

	items := make([]types.MemberItem, 0, len(list))
	for _, m := range list {
		var username, nickname string
		if u, ok := userMap[m.UserId]; ok {
			username = u.Username
			nickname = u.Nickname
		}

		items = append(items, types.MemberItem{
			Id:          m.Id,
			ProductCode: m.ProductCode,
			UserId:      m.UserId,
			Username:    username,
			Nickname:    nickname,
			MemberType:  m.MemberType,
			Status:      m.Status,
			CreateTime:  m.CreateTime,
		})
	}

	return &types.PageResp{
		Total: total,
		List:  items,
	}, nil
}