add: chat service

app/chat/rpc/internal/logic/addChatMessagesLogic.go

@@ -0,0 +1,69 @@
+package logic
+
+import (
+	"context"
+	"errors"
+
+	"juwan-backend/app/chat/rpc/internal/svc"
+	"juwan-backend/app/chat/rpc/pb"
+
+	"github.com/zeromicro/go-zero/core/logx"
+)
+
+type AddChatMessagesLogic struct {
+	ctx    context.Context
+	svcCtx *svc.ServiceContext
+	logx.Logger
+}
+
+func NewAddChatMessagesLogic(ctx context.Context, svcCtx *svc.ServiceContext) *AddChatMessagesLogic {
+	return &AddChatMessagesLogic{
+		ctx:    ctx,
+		svcCtx: svcCtx,
+		Logger: logx.WithContext(ctx),
+	}
+}
+
+func (l *AddChatMessagesLogic) AddChatMessages(in *pb.AddChatMessagesReq) (*pb.AddChatMessagesResp, error) {
+	if in.GetSessionId() <= 0 {
+		return nil, errors.New("sessionId is required")
+	}
+	if in.GetSenderId() <= 0 {
+		return nil, errors.New("senderId is required")
+	}
+	if in.GetContent() == "" {
+		return nil, errors.New("content is required")
+	}
+
+	store := l.svcCtx.Store
+	store.Mu.Lock()
+	defer store.Mu.Unlock()
+
+	if _, ok := store.Sessions[in.GetSessionId()]; !ok {
+		return nil, errors.New("session not found")
+	}
+
+	now := nowUnix(0)
+	msgType := in.GetType()
+	if msgType == "" {
+		msgType = "text"
+	}
+
+	msg := &pb.ChatMessages{
+		Id:        store.NextMessage(),
+		SessionId: in.GetSessionId(),
+		SenderId:  in.GetSenderId(),
+		Type:      msgType,
+		Content:   in.GetContent(),
+		CreatedAt: now,
+	}
+	store.Messages[msg.Id] = msg
+	store.SessionMessages[in.GetSessionId()] = append(store.SessionMessages[in.GetSessionId()], msg.Id)
+
+	session := store.Sessions[in.GetSessionId()]
+	session.LastMessage = in.GetContent()
+	session.LastMessageAt = now
+	session.UpdatedAt = now
+
+	return &pb.AddChatMessagesResp{Id: msg.Id}, nil
+}