拆分大型 Repository 文件职责
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yml2213
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package chat
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import (
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"context"
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"fmt"
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"gorm.io/gorm"
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"hfb_sys/backend/internal/model"
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"time"
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)
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func (r *Repository) TransferConversation(ctx context.Context, principal Principal, conversationID uint64, toAdminID uint64) error {
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return r.db.WithContext(ctx).Transaction(func(tx *gorm.DB) error {
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// 验证当前操作者是会话参与者
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if _, err := r.findParticipant(tx, principal, conversationID, false); err != nil {
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return err
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}
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// 验证目标客服存在、活跃且拥有客服角色，避免转接给超级管理员。
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if !adminIsSupport(tx, toAdminID) {
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return fmt.Errorf("目标客服不存在、已禁用或不是客服角色")
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}
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// 检查目标客服是否已有该会话
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var count int64
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if err := tx.Model(&model.ChatParticipant{}).
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Where("conversation_id = ? AND participant_type = ? AND participant_id = ?", conversationID, "admin", toAdminID).
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Count(&count).Error; err != nil {
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return err
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}
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if count > 0 {
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return fmt.Errorf("该客服已在会话中")
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}
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// 删除原客服参与者
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if err := tx.Where("conversation_id = ? AND participant_type = ? AND role = ?", conversationID, "admin", "support").
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Delete(&model.ChatParticipant{}).Error; err != nil {
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return err
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}
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// 添加新客服参与者
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participant := model.ChatParticipant{
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ConversationID: conversationID,
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ParticipantType: "admin",
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ParticipantID: toAdminID,
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Role: "support",
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JoinedAt: time.Now(),
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}
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if err := tx.Create(&participant).Error; err != nil {
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return err
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}
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// 添加系统消息记录转接
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message := model.ChatMessage{
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ConversationID: conversationID,
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SenderType: "system",
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SenderRole: "system",
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ContentType: "system",
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Content: "会话已转接给其他客服",
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AttachmentURLS: emptyJSONList(),
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}
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if err := tx.Create(&message).Error; err != nil {
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return err
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}
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return nil
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})
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}
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func (r *Repository) GetAvailableSupportAdmins(ctx context.Context) ([]SupportAdminDTO, error) {
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db := r.db.WithContext(ctx)
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// 仅展示客服角色管理员，超级管理员即使有 chat:view 权限也不作为客服候选。
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type adminRow struct {
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ID uint64
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Nickname string
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SupportStatus string
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}
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var admins []adminRow
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err := db.Table("admin_users AS au").
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Select("au.id, COALESCE(NULLIF(au.nickname, ''), au.username) AS nickname, au.support_status").
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Joins("JOIN admin_user_roles AS aur ON aur.admin_user_id = au.id").
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Joins("JOIN roles AS r ON r.id = aur.role_id").
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Where("au.status = ? AND r.code = ?", "active", defaultSupportRoleCode).
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Order("CASE au.support_status WHEN 'online' THEN 0 WHEN 'busy' THEN 1 ELSE 2 END, au.id ASC").
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Scan(&admins).Error
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if err != nil {
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return nil, err
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}
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// 统计每个客服的会话数
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type loadRow struct {
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AdminID uint64
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Count int64
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}
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var loads []loadRow
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adminIDs := make([]uint64, len(admins))
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for i, a := range admins {
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adminIDs[i] = a.ID
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}
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if len(adminIDs) > 0 {
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db.Table("chat_participants").
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Select("participant_id AS admin_id, COUNT(*) AS count").
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Where("participant_type = ? AND role = ? AND participant_id IN ?", "admin", "support", adminIDs).
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Group("participant_id").
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Scan(&loads)
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}
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loadMap := make(map[uint64]int64)
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for _, l := range loads {
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loadMap[l.AdminID] = l.Count
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}
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result := make([]SupportAdminDTO, len(admins))
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for i, a := range admins {
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result[i] = SupportAdminDTO{
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ID: a.ID,
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Nickname: a.Nickname,
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SupportStatus: a.SupportStatus,
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ChatCount: loadMap[a.ID],
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}
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}
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return result, nil
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}
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func (r *Repository) ListConversationsWithFilter(ctx context.Context, principal Principal, page, pageSize int, filter string) (*PaginatedResult, error) {
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page, pageSize = normalizePagination(page, pageSize)
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db := r.db.WithContext(ctx)
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// 管理员在"全部"模式下直接查询所有会话
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if principal.Type == "admin" && filter == "all" {
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var total int64
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if err := db.Model(&model.ChatConversation{}).Count(&total).Error; err != nil {
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return nil, err
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}
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var conversations []model.ChatConversation
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offset := (page - 1) * pageSize
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if err := db.Order("COALESCE(last_message_at, created_at) DESC, id DESC").
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Offset(offset).
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Limit(pageSize).
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Find(&conversations).Error; err != nil {
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return nil, err
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}
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items := make([]ConversationDTO, 0, len(conversations))
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for _, conv := range conversations {
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participants, err := r.participants(ctx, conv.ID)
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if err != nil {
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return nil, err
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}
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items = append(items, ConversationDTO{
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ID: conv.ID,
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OrderID: conv.OrderID,
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Type: conv.Type,
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Title: conv.Title,
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Status: conv.Status,
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Role: "admin", // 管理员角色
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Participants: participants,
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LastMessageID: conv.LastMessageID,
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LastMessagePreview: conv.LastMessagePreview,
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LastMessageAt: conv.LastMessageAt,
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UnreadCount: 0, // 管理员不计未读
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CreatedAt: conv.CreatedAt,
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UpdatedAt: conv.UpdatedAt,
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})
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}
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return &PaginatedResult{Items: items, Total: total, Page: page, PageSize: pageSize}, nil
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}
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// 其他情况使用原有逻辑
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var total int64
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countDB := db.Table("chat_conversations AS c").
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Joins("JOIN chat_participants AS cp ON cp.conversation_id = c.id")
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switch filter {
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case "mine":
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// 只看我的会话
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countDB = countDB.Where("cp.participant_type = ? AND cp.participant_id = ?", principal.Type, principal.ID)
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case "unassigned":
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// 未分配客服的会话
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countDB = countDB.Where("c.id NOT IN (?)",
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db.Table("chat_participants").Select("conversation_id").Where("participant_type = ? AND role = ?", "admin", "support"))
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default:
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// 普通用户的全部会话
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countDB = countDB.Where("cp.participant_type = ? AND cp.participant_id = ?", principal.Type, principal.ID)
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}
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if err := countDB.Count(&total).Error; err != nil {
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return nil, err
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}
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var rows []conversationRow
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offset := (page - 1) * pageSize
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queryDB := r.conversationQuery(ctx, principal)
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switch filter {
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case "mine":
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queryDB = queryDB.Where("cp.participant_type = ? AND cp.participant_id = ?", principal.Type, principal.ID)
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case "unassigned":
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queryDB = queryDB.Where("c.id NOT IN (?)",
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db.Table("chat_participants").Select("conversation_id").Where("participant_type = ? AND role = ?", "admin", "support"))
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default:
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// 普通用户的全部会话
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queryDB = queryDB.Where("cp.participant_type = ? AND cp.participant_id = ?", principal.Type, principal.ID)
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}
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err := queryDB.
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Order("COALESCE(c.last_message_at, c.created_at) DESC, c.id DESC").
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Offset(offset).
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Limit(pageSize).
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Scan(&rows).Error
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if err != nil {
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return nil, err
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}
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items := make([]ConversationDTO, 0, len(rows))
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for _, row := range rows {
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participants, err := r.participants(ctx, row.ID)
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if err != nil {
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return nil, err
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}
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items = append(items, row.toDTO(participants))
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}
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return &PaginatedResult{Items: items, Total: total, Page: page, PageSize: pageSize}, nil
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}
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