backend/internal/dto/call_dto.go

package dto

import (
	"time"

	"carrot_bbs/internal/model"
)

// ==================== Call Request DTOs ====================

// StartCallRequest 发起通话请求
type StartCallRequest struct {
	ConversationID string         `json:"conversation_id" binding:"required"` // 会话ID
	CallType       model.CallType `json:"call_type" binding:"required"`       // 通话类型: private, group
}

// AnswerCallRequest 接听通话请求
type AnswerCallRequest struct {
	SDP string `json:"sdp" binding:"required"` // SDP Answer
}

// SendSDPRequest 发送SDP请求
type SendSDPRequest struct {
	SDP  string `json:"sdp" binding:"required"`  // SDP Offer/Answer
	Type string `json:"type" binding:"required"` // offer 或 answer
}

// SendICECandidateRequest 发送ICE候选请求
type SendICECandidateRequest struct {
	Candidate     string `json:"candidate" binding:"required"`      // candidate 字符串
	SDPMid        string `json:"sdp_mid"`                           // SDP mid
	SDPMLineIndex int16  `json:"sdp_mline_index"`                   // SDP m-line index
}

// ==================== Call Response DTOs ====================

// CallSessionResponse 通话会话响应
type CallSessionResponse struct {
	ID             string                  `json:"id"`              // 通话ID
	ConversationID string                  `json:"conversation_id"` // 会话ID
	GroupID        string                  `json:"group_id,omitempty"`
	CallerID       string                  `json:"caller_id"`       // 发起者ID
	CallType       model.CallType          `json:"call_type"`       // 通话类型
	Status         model.CallStatus        `json:"status"`          // 通话状态
	StartedAt      *time.Time              `json:"started_at,omitempty"`
	EndedAt        *time.Time              `json:"ended_at,omitempty"`
	Duration       int64                   `json:"duration"`        // 通话时长(秒)
	CreatedAt      time.Time               `json:"created_at"`
	Participants   []CallParticipantResponse `json:"participants"`  // 参与者列表
	Caller         *UserResponse           `json:"caller,omitempty"` // 发起者信息
}

// CallParticipantResponse 通话参与者响应
type CallParticipantResponse struct {
	UserID   string                 `json:"user_id"`
	Status   model.ParticipantStatus `json:"status"`
	JoinedAt *time.Time             `json:"joined_at,omitempty"`
	LeftAt   *time.Time             `json:"left_at,omitempty"`
	User     *UserResponse          `json:"user,omitempty"`
}

// ==================== Call SSE Event DTOs ====================

// CallInviteEvent 来电邀请事件
type CallInviteEvent struct {
	CallID       string         `json:"call_id"`
	ConversationID string       `json:"conversation_id"`
	GroupID       string        `json:"group_id,omitempty"`
	CallerID      string        `json:"caller_id"`
	CallType      model.CallType `json:"call_type"`
	Caller        *UserResponse `json:"caller,omitempty"`
	CreatedAt     time.Time     `json:"created_at"`
}

// CallAnswerEvent 接听响应事件
type CallAnswerEvent struct {
	CallID    string `json:"call_id"`
	UserID    string `json:"user_id"`
	SDP       string `json:"sdp"`       // SDP Answer
}

// CallRejectEvent 拒绝通话事件
type CallRejectEvent struct {
	CallID string `json:"call_id"`
	UserID string `json:"user_id"`
}

// CallEndEvent 结束通话事件
type CallEndEvent struct {
	CallID   string `json:"call_id"`
	UserID   string `json:"user_id"`
	Duration int64  `json:"duration"`
}

// CallICECandidateEvent ICE候选事件
type CallICECandidateEvent struct {
	CallID        string `json:"call_id"`
	UserID        string `json:"user_id"`
	Candidate     string `json:"candidate"`
	SDPMid        string `json:"sdp_mid"`
	SDPMLineIndex int16  `json:"sdp_mline_index"`
}

// CallSDPOfferEvent SDP Offer事件
type CallSDPOfferEvent struct {
	CallID string `json:"call_id"`
	UserID string `json:"user_id"`
	SDP    string `json:"sdp"`
}

// CallSDPAnswerEvent SDP Answer事件
type CallSDPAnswerEvent struct {
	CallID string `json:"call_id"`
	UserID string `json:"user_id"`
	SDP    string `json:"sdp"`
}

// CallUserJoinedEvent 用户加入通话事件(群聊)
type CallUserJoinedEvent struct {
	CallID string        `json:"call_id"`
	UserID string        `json:"user_id"`
	User   *UserResponse `json:"user,omitempty"`
}

// CallUserLeftEvent 用户离开通话事件(群聊)
type CallUserLeftEvent struct {
	CallID string `json:"call_id"`
	UserID string `json:"user_id"`
}

// ==================== ICE Server Config ====================

// ICEServerConfig ICE服务器配置
type ICEServerConfig struct {
	URLs           []string `json:"urls"`
	Username       string   `json:"username,omitempty"`
	Credential     string   `json:"credential,omitempty"`
	CredentialType string   `json:"credential_type,omitempty"`
}

// CallConfigResponse 通话配置响应
type CallConfigResponse struct {
	ICEServers []ICEServerConfig `json:"ice_servers"`
}

// ==================== Converter Functions ====================

// ConvertCallSessionToResponse 转换通话会话为响应格式
func ConvertCallSessionToResponse(call *model.CallSession, caller *model.User, participants []*model.User) *CallSessionResponse {
	resp := &CallSessionResponse{
		ID:             call.ID,
		ConversationID: call.ConversationID,
		CallerID:       call.CallerID,
		CallType:       call.CallType,
		Status:         call.Status,
		StartedAt:      call.StartedAt,
		EndedAt:        call.EndedAt,
		Duration:       call.Duration,
		CreatedAt:      call.CreatedAt,
	}

	if call.GroupID != nil {
		resp.GroupID = *call.GroupID
	}

	if caller != nil {
		resp.Caller = ConvertUserToResponse(caller)
	}

	// 转换参与者
	resp.Participants = make([]CallParticipantResponse, 0, len(call.Participants))
	userMap := make(map[string]*model.User)
	for _, u := range participants {
		userMap[u.ID] = u
	}

	for _, p := range call.Participants {
		pr := CallParticipantResponse{
			UserID:   p.UserID,
			Status:   p.Status,
			JoinedAt: p.JoinedAt,
			LeftAt:   p.LeftAt,
		}
		if u, ok := userMap[p.UserID]; ok {
			pr.User = ConvertUserToResponse(u)
		}
		resp.Participants = append(resp.Participants, pr)
	}

	return resp
}