package group

import (
	"context"
	"github.com/openimsdk/open-im-server/v3/internal/rpc/incrversion"
	"github.com/openimsdk/open-im-server/v3/pkg/authverify"
	"github.com/openimsdk/open-im-server/v3/pkg/common/storage/model"
	"github.com/openimsdk/open-im-server/v3/pkg/util/hashutil"
	pbgroup "github.com/openimsdk/protocol/group"
	"github.com/openimsdk/protocol/sdkws"
)

func (s *groupServer) GetFullGroupMemberUserIDs(ctx context.Context, req *pbgroup.GetFullGroupMemberUserIDsReq) (*pbgroup.GetFullGroupMemberUserIDsResp, error) {
	vl, err := s.db.FindMaxGroupMemberVersionCache(ctx, req.GroupID)
	if err != nil {
		return nil, err
	}
	userIDs, err := s.db.FindGroupMemberUserID(ctx, req.GroupID)
	if err != nil {
		return nil, err
	}
	idHash := hashutil.IdHash(userIDs)
	if req.IdHash == idHash {
		userIDs = nil
	}
	return &pbgroup.GetFullGroupMemberUserIDsResp{
		Version:   idHash,
		VersionID: vl.ID.Hex(),
		Equal:     req.IdHash == idHash,
		UserIDs:   userIDs,
	}, nil
}

func (s *groupServer) GetFullJoinGroupIDs(ctx context.Context, req *pbgroup.GetFullJoinGroupIDsReq) (*pbgroup.GetFullJoinGroupIDsResp, error) {
	vl, err := s.db.FindMaxJoinGroupVersionCache(ctx, req.UserID)
	if err != nil {
		return nil, err
	}
	groupIDs, err := s.db.FindJoinGroupID(ctx, req.UserID)
	if err != nil {
		return nil, err
	}
	idHash := hashutil.IdHash(groupIDs)
	if req.IdHash == idHash {
		groupIDs = nil
	}
	return &pbgroup.GetFullJoinGroupIDsResp{
		Version:   idHash,
		VersionID: vl.ID.Hex(),
		Equal:     req.IdHash == idHash,
		GroupIDs:  groupIDs,
	}, nil
}

func (s *groupServer) GetIncrementalGroupMember(ctx context.Context, req *pbgroup.GetIncrementalGroupMemberReq) (*pbgroup.GetIncrementalGroupMemberResp, error) {
	opt := incrversion.Option[*sdkws.GroupMemberFullInfo, pbgroup.GetIncrementalGroupMemberResp]{
		Ctx:             ctx,
		VersionKey:      req.GroupID,
		VersionID:       req.VersionID,
		VersionNumber:   req.Version,
		Version:         s.db.FindMemberIncrVersion,
		CacheMaxVersion: s.db.FindMaxGroupMemberVersionCache,
		Find: func(ctx context.Context, ids []string) ([]*sdkws.GroupMemberFullInfo, error) {
			return s.getGroupMembersInfo(ctx, req.GroupID, ids)
		},
		ID: func(elem *sdkws.GroupMemberFullInfo) string { return elem.UserID },
		Resp: func(version *model.VersionLog, delIDs []string, insertList, updateList []*sdkws.GroupMemberFullInfo, full bool) *pbgroup.GetIncrementalGroupMemberResp {
			return &pbgroup.GetIncrementalGroupMemberResp{
				VersionID: version.ID.Hex(),
				Version:   uint64(version.Version),
				Full:      full,
				Delete:    delIDs,
				Insert:    insertList,
				Update:    updateList,
			}
		},
	}
	return opt.Build()
}

func (s *groupServer) GetIncrementalJoinGroup(ctx context.Context, req *pbgroup.GetIncrementalJoinGroupReq) (*pbgroup.GetIncrementalJoinGroupResp, error) {
	if err := authverify.CheckAccessV3(ctx, req.UserID, s.config.Share.IMAdminUserID); err != nil {
		return nil, err
	}
	opt := incrversion.Option[*sdkws.GroupInfo, pbgroup.GetIncrementalJoinGroupResp]{
		Ctx:             ctx,
		VersionKey:      req.UserID,
		VersionID:       req.VersionID,
		VersionNumber:   req.Version,
		Version:         s.db.FindJoinIncrVersion,
		CacheMaxVersion: s.db.FindMaxJoinGroupVersionCache,
		Find:            s.getGroupsInfo,
		ID:              func(elem *sdkws.GroupInfo) string { return elem.GroupID },
		Resp: func(version *model.VersionLog, delIDs []string, insertList, updateList []*sdkws.GroupInfo, full bool) *pbgroup.GetIncrementalJoinGroupResp {
			return &pbgroup.GetIncrementalJoinGroupResp{
				VersionID: version.ID.Hex(),
				Version:   uint64(version.Version),
				Full:      full,
				Delete:    delIDs,
				Insert:    insertList,
				Update:    updateList,
			}
		},
	}
	return opt.Build()
}