Reapply "Build post chat and attachment workflows"

This reverts commit 5bc4a551af.

backend/internal/calendar/attachments.go

@@ -137,6 +137,26 @@ func (s Store) FindAttachment(ctx context.Context, id string, viewerUserID strin
 	return scanAttachment(row)
 }
 
+func (s Store) DeleteAttachment(ctx context.Context, id string) (Attachment, error) {
+	row := s.db.QueryRow(ctx, `
+		DELETE FROM calendar_item_attachments
+		WHERE id = $1::uuid
+		RETURNING
+			id::text,
+			calendar_item_id::text,
+			original_filename,
+			stored_filename,
+			mime_type,
+			size_bytes,
+			storage_driver,
+			storage_path,
+			created_by::text,
+			created_at
+	`, id)
+
+	return scanAttachment(row)
+}
+
 type attachmentScanner interface {
 	Scan(dest ...any) error
 }

backend/internal/calendar/chat.go

@@ -0,0 +1,377 @@
+package calendar
+
+import (
+	"context"
+	"errors"
+	"time"
+
+	"github.com/jackc/pgx/v5"
+)
+
+var ErrChatMessageNotFound = errors.New("chat message not found")
+
+const (
+	ChatChannelExternal = "external"
+	ChatChannelInternal = "internal"
+)
+
+type ChatMessage struct {
+	ID             string           `json:"id"`
+	CalendarItemID string           `json:"calendar_item_id"`
+	Channel        string           `json:"channel"`
+	Body           string           `json:"body"`
+	CreatedBy      *string          `json:"created_by"`
+	AuthorName     string           `json:"author_name"`
+	AuthorRole     string           `json:"author_role"`
+	CreatedAt      time.Time        `json:"created_at"`
+	EditedAt       *time.Time       `json:"edited_at"`
+	DeletedAt      *time.Time       `json:"deleted_at"`
+	Attachments    []ChatAttachment `json:"attachments"`
+}
+
+type ChatAttachment struct {
+	ID               string    `json:"id"`
+	ChatMessageID    string    `json:"chat_message_id"`
+	OriginalFilename string    `json:"original_filename"`
+	StoredFilename   string    `json:"stored_filename"`
+	MimeType         string    `json:"mime_type"`
+	SizeBytes        int64     `json:"size_bytes"`
+	StorageDriver    string    `json:"storage_driver"`
+	StoragePath      string    `json:"-"`
+	CreatedBy        *string   `json:"created_by"`
+	CreatedAt        time.Time `json:"created_at"`
+}
+
+type CreateChatMessageInput struct {
+	CalendarItemID string
+	Channel        string
+	Body           string
+	CreatedBy      string
+}
+
+type CreateChatAttachmentInput struct {
+	ChatMessageID    string
+	OriginalFilename string
+	StoredFilename   string
+	MimeType         string
+	SizeBytes        int64
+	StorageDriver    string
+	StoragePath      string
+	CreatedBy        string
+}
+
+func (s Store) ListChatMessages(ctx context.Context, calendarItemID string, channel string) ([]ChatMessage, error) {
+	rows, err := s.db.Query(ctx, `
+		SELECT
+			calendar_item_chat_messages.id::text,
+			calendar_item_chat_messages.calendar_item_id::text,
+			calendar_item_chat_messages.channel,
+			calendar_item_chat_messages.body,
+			calendar_item_chat_messages.created_by::text,
+			COALESCE(users.name, 'Usuario removido'),
+			COALESCE(users.role, ''),
+			calendar_item_chat_messages.created_at,
+			calendar_item_chat_messages.edited_at,
+			calendar_item_chat_messages.deleted_at
+		FROM calendar_item_chat_messages
+		LEFT JOIN users ON users.id = calendar_item_chat_messages.created_by
+		WHERE calendar_item_chat_messages.calendar_item_id = $1::uuid
+		AND calendar_item_chat_messages.channel = $2
+		ORDER BY calendar_item_chat_messages.created_at ASC
+	`, calendarItemID, channel)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	messages := []ChatMessage{}
+	for rows.Next() {
+		message, err := scanChatMessage(rows)
+		if err != nil {
+			return nil, err
+		}
+		messages = append(messages, message)
+	}
+
+	if err := rows.Err(); err != nil {
+		return nil, err
+	}
+
+	if err := s.attachChatAttachments(ctx, messages); err != nil {
+		return nil, err
+	}
+
+	return messages, nil
+}
+
+func (s Store) CreateChatMessage(ctx context.Context, input CreateChatMessageInput) (ChatMessage, error) {
+	row := s.db.QueryRow(ctx, `
+		INSERT INTO calendar_item_chat_messages (
+			calendar_item_id,
+			channel,
+			body,
+			created_by
+		)
+		VALUES ($1::uuid, $2, $3, NULLIF($4, '')::uuid)
+		RETURNING
+			calendar_item_chat_messages.id::text,
+			calendar_item_chat_messages.calendar_item_id::text,
+			calendar_item_chat_messages.channel,
+			calendar_item_chat_messages.body,
+			calendar_item_chat_messages.created_by::text,
+			COALESCE((SELECT users.name FROM users WHERE users.id = calendar_item_chat_messages.created_by), 'Usuario removido'),
+			COALESCE((SELECT users.role FROM users WHERE users.id = calendar_item_chat_messages.created_by), ''),
+			calendar_item_chat_messages.created_at,
+			calendar_item_chat_messages.edited_at,
+			calendar_item_chat_messages.deleted_at
+	`, input.CalendarItemID, input.Channel, input.Body, input.CreatedBy)
+
+	return scanChatMessage(row)
+}
+
+func (s Store) FindChatMessage(ctx context.Context, id string) (ChatMessage, error) {
+	row := s.db.QueryRow(ctx, `
+		SELECT
+			calendar_item_chat_messages.id::text,
+			calendar_item_chat_messages.calendar_item_id::text,
+			calendar_item_chat_messages.channel,
+			calendar_item_chat_messages.body,
+			calendar_item_chat_messages.created_by::text,
+			COALESCE(users.name, 'Usuario removido'),
+			COALESCE(users.role, ''),
+			calendar_item_chat_messages.created_at,
+			calendar_item_chat_messages.edited_at,
+			calendar_item_chat_messages.deleted_at
+		FROM calendar_item_chat_messages
+		LEFT JOIN users ON users.id = calendar_item_chat_messages.created_by
+		WHERE calendar_item_chat_messages.id = $1::uuid
+	`, id)
+
+	message, err := scanChatMessage(row)
+	if err != nil {
+		return ChatMessage{}, err
+	}
+	messages := []ChatMessage{message}
+	if err := s.attachChatAttachments(ctx, messages); err != nil {
+		return ChatMessage{}, err
+	}
+	return messages[0], nil
+}
+
+func (s Store) UpdateChatMessage(ctx context.Context, id string, body string) (ChatMessage, error) {
+	row := s.db.QueryRow(ctx, `
+		UPDATE calendar_item_chat_messages
+		SET body = $2, edited_at = now()
+		WHERE id = $1::uuid
+		AND deleted_at IS NULL
+		RETURNING
+			calendar_item_chat_messages.id::text,
+			calendar_item_chat_messages.calendar_item_id::text,
+			calendar_item_chat_messages.channel,
+			calendar_item_chat_messages.body,
+			calendar_item_chat_messages.created_by::text,
+			COALESCE((SELECT users.name FROM users WHERE users.id = calendar_item_chat_messages.created_by), 'Usuario removido'),
+			COALESCE((SELECT users.role FROM users WHERE users.id = calendar_item_chat_messages.created_by), ''),
+			calendar_item_chat_messages.created_at,
+			calendar_item_chat_messages.edited_at,
+			calendar_item_chat_messages.deleted_at
+	`, id, body)
+
+	message, err := scanChatMessage(row)
+	if err != nil {
+		return ChatMessage{}, err
+	}
+	messages := []ChatMessage{message}
+	if err := s.attachChatAttachments(ctx, messages); err != nil {
+		return ChatMessage{}, err
+	}
+	return messages[0], nil
+}
+
+func (s Store) DeleteChatMessage(ctx context.Context, id string) (ChatMessage, error) {
+	row := s.db.QueryRow(ctx, `
+		UPDATE calendar_item_chat_messages
+		SET deleted_at = now(), body = ''
+		WHERE id = $1::uuid
+		AND deleted_at IS NULL
+		RETURNING
+			calendar_item_chat_messages.id::text,
+			calendar_item_chat_messages.calendar_item_id::text,
+			calendar_item_chat_messages.channel,
+			calendar_item_chat_messages.body,
+			calendar_item_chat_messages.created_by::text,
+			COALESCE((SELECT users.name FROM users WHERE users.id = calendar_item_chat_messages.created_by), 'Usuario removido'),
+			COALESCE((SELECT users.role FROM users WHERE users.id = calendar_item_chat_messages.created_by), ''),
+			calendar_item_chat_messages.created_at,
+			calendar_item_chat_messages.edited_at,
+			calendar_item_chat_messages.deleted_at
+	`, id)
+
+	return scanChatMessage(row)
+}
+
+func (s Store) CreateChatAttachment(ctx context.Context, input CreateChatAttachmentInput) (ChatAttachment, error) {
+	row := s.db.QueryRow(ctx, `
+		INSERT INTO calendar_item_chat_attachments (
+			chat_message_id,
+			original_filename,
+			stored_filename,
+			mime_type,
+			size_bytes,
+			storage_driver,
+			storage_path,
+			created_by
+		)
+		VALUES ($1::uuid, $2, $3, $4, $5, $6, $7, NULLIF($8, '')::uuid)
+		RETURNING
+			id::text,
+			chat_message_id::text,
+			original_filename,
+			stored_filename,
+			mime_type,
+			size_bytes,
+			storage_driver,
+			storage_path,
+			created_by::text,
+			created_at
+	`, input.ChatMessageID, input.OriginalFilename, input.StoredFilename, input.MimeType, input.SizeBytes, input.StorageDriver, input.StoragePath, input.CreatedBy)
+
+	return scanChatAttachment(row)
+}
+
+func (s Store) FindChatAttachment(ctx context.Context, id string, viewerUserID string) (ChatAttachment, error) {
+	row := s.db.QueryRow(ctx, `
+		SELECT
+			calendar_item_chat_attachments.id::text,
+			calendar_item_chat_attachments.chat_message_id::text,
+			calendar_item_chat_attachments.original_filename,
+			calendar_item_chat_attachments.stored_filename,
+			calendar_item_chat_attachments.mime_type,
+			calendar_item_chat_attachments.size_bytes,
+			calendar_item_chat_attachments.storage_driver,
+			calendar_item_chat_attachments.storage_path,
+			calendar_item_chat_attachments.created_by::text,
+			calendar_item_chat_attachments.created_at
+		FROM calendar_item_chat_attachments
+		INNER JOIN calendar_item_chat_messages ON calendar_item_chat_messages.id = calendar_item_chat_attachments.chat_message_id
+		INNER JOIN calendar_items ON calendar_items.id = calendar_item_chat_messages.calendar_item_id
+		WHERE calendar_item_chat_attachments.id = $1::uuid
+		AND calendar_item_chat_messages.deleted_at IS NULL
+		AND (
+			$2 = ''
+			OR (
+				calendar_item_chat_messages.channel = 'external'
+				AND EXISTS (
+					SELECT 1
+					FROM client_users
+					WHERE client_users.client_id = calendar_items.client_id
+					AND client_users.user_id = $2::uuid
+				)
+			)
+		)
+	`, id, viewerUserID)
+
+	return scanChatAttachment(row)
+}
+
+func (s Store) attachChatAttachments(ctx context.Context, messages []ChatMessage) error {
+	if len(messages) == 0 {
+		return nil
+	}
+
+	ids := make([]string, 0, len(messages))
+	indexByID := map[string]int{}
+	for index, message := range messages {
+		ids = append(ids, message.ID)
+		indexByID[message.ID] = index
+	}
+
+	rows, err := s.db.Query(ctx, `
+		SELECT
+			id::text,
+			chat_message_id::text,
+			original_filename,
+			stored_filename,
+			mime_type,
+			size_bytes,
+			storage_driver,
+			storage_path,
+			created_by::text,
+			created_at
+		FROM calendar_item_chat_attachments
+		WHERE chat_message_id::text = ANY($1)
+		ORDER BY created_at ASC
+	`, ids)
+	if err != nil {
+		return err
+	}
+	defer rows.Close()
+
+	for rows.Next() {
+		attachment, err := scanChatAttachment(rows)
+		if err != nil {
+			return err
+		}
+		index, ok := indexByID[attachment.ChatMessageID]
+		if ok {
+			messages[index].Attachments = append(messages[index].Attachments, attachment)
+		}
+	}
+
+	return rows.Err()
+}
+
+type chatMessageScanner interface {
+	Scan(dest ...any) error
+}
+
+func scanChatMessage(row chatMessageScanner) (ChatMessage, error) {
+	var message ChatMessage
+	err := row.Scan(
+		&message.ID,
+		&message.CalendarItemID,
+		&message.Channel,
+		&message.Body,
+		&message.CreatedBy,
+		&message.AuthorName,
+		&message.AuthorRole,
+		&message.CreatedAt,
+		&message.EditedAt,
+		&message.DeletedAt,
+	)
+	if errors.Is(err, pgx.ErrNoRows) {
+		return ChatMessage{}, ErrChatMessageNotFound
+	}
+	if err != nil {
+		return ChatMessage{}, err
+	}
+	message.Attachments = []ChatAttachment{}
+	return message, nil
+}
+
+type chatAttachmentScanner interface {
+	Scan(dest ...any) error
+}
+
+func scanChatAttachment(row chatAttachmentScanner) (ChatAttachment, error) {
+	var attachment ChatAttachment
+	err := row.Scan(
+		&attachment.ID,
+		&attachment.ChatMessageID,
+		&attachment.OriginalFilename,
+		&attachment.StoredFilename,
+		&attachment.MimeType,
+		&attachment.SizeBytes,
+		&attachment.StorageDriver,
+		&attachment.StoragePath,
+		&attachment.CreatedBy,
+		&attachment.CreatedAt,
+	)
+	if errors.Is(err, pgx.ErrNoRows) {
+		return ChatAttachment{}, ErrAttachmentNotFound
+	}
+	if err != nil {
+		return ChatAttachment{}, err
+	}
+	return attachment, nil
+}

backend/internal/calendar/chat_events.go

@@ -0,0 +1,55 @@
+package calendar
+
+import "sync"
+
+type ChatEventHub struct {
+	mu          sync.Mutex
+	subscribers map[string]map[chan struct{}]struct{}
+}
+
+func NewChatEventHub() *ChatEventHub {
+	return &ChatEventHub{
+		subscribers: map[string]map[chan struct{}]struct{}{},
+	}
+}
+
+func (h *ChatEventHub) Subscribe(itemID string, channel string) (chan struct{}, func()) {
+	key := chatEventKey(itemID, channel)
+	events := make(chan struct{}, 1)
+
+	h.mu.Lock()
+	if h.subscribers[key] == nil {
+		h.subscribers[key] = map[chan struct{}]struct{}{}
+	}
+	h.subscribers[key][events] = struct{}{}
+	h.mu.Unlock()
+
+	return events, func() {
+		h.mu.Lock()
+		defer h.mu.Unlock()
+
+		delete(h.subscribers[key], events)
+		if len(h.subscribers[key]) == 0 {
+			delete(h.subscribers, key)
+		}
+		close(events)
+	}
+}
+
+func (h *ChatEventHub) Publish(itemID string, channel string) {
+	key := chatEventKey(itemID, channel)
+
+	h.mu.Lock()
+	defer h.mu.Unlock()
+
+	for events := range h.subscribers[key] {
+		select {
+		case events <- struct{}{}:
+		default:
+		}
+	}
+}
+
+func chatEventKey(itemID string, channel string) string {
+	return itemID + ":" + channel
+}

backend/internal/calendar/routes.go

@@ -22,6 +22,7 @@ type Routes struct {
 	store              Store
 	provider           Provider
 	commemorative      CommemorativeProvider
+	chatEvents         *ChatEventHub
 	uploadMaxSizeBytes int64
 	uploadAllowedMIMEs map[string]bool
 	storageDriver      string
@@ -54,6 +55,7 @@ func NewRoutes(store Store, provider Provider, commemorative CommemorativeProvid
 		store:              store,
 		provider:           provider,
 		commemorative:      commemorative,
+		chatEvents:         NewChatEventHub(),
 		uploadMaxSizeBytes: int64(options.UploadMaxSizeMB) * 1024 * 1024,
 		uploadAllowedMIMEs: allowedMIMEs,
 		storageDriver:      options.StorageDriver,
@@ -80,7 +82,15 @@ func (r Routes) Register(router *gin.RouterGroup, requireAuth gin.HandlerFunc) {
 	router.DELETE("/items/:itemId", r.cancelCalendarItem)
 	router.GET("/items/:itemId/attachments", r.listAttachments)
 	router.POST("/items/:itemId/attachments", r.uploadAttachment)
+	router.GET("/items/:itemId/chat", r.listChatMessages)
+	router.GET("/items/:itemId/chat/stream", r.streamChatMessages)
+	router.POST("/items/:itemId/chat", r.createChatMessage)
+	router.PATCH("/chat/messages/:messageId", r.updateChatMessage)
+	router.DELETE("/chat/messages/:messageId", r.deleteChatMessage)
+	router.POST("/chat/messages/:messageId/attachments", r.uploadChatAttachment)
+	router.GET("/chat/attachments/:attachmentId/download", r.downloadChatAttachment)
 	router.GET("/attachments/:attachmentId/download", r.downloadAttachment)
+	router.DELETE("/attachments/:attachmentId", r.deleteAttachment)
 }
 
 func (r Routes) holidays(c *gin.Context) {
@@ -604,6 +614,376 @@ func (r Routes) listAttachments(c *gin.Context) {
 	c.JSON(http.StatusOK, gin.H{"attachments": attachments})
 }
 
+func (r Routes) listChatMessages(c *gin.Context) {
+	claims, ok := auth.ClaimsFromContext(c)
+	if !ok {
+		c.JSON(http.StatusUnauthorized, gin.H{"message": "Autenticacao obrigatoria."})
+		return
+	}
+
+	channel := strings.TrimSpace(c.Query("channel"))
+	if channel == "" {
+		channel = ChatChannelExternal
+	}
+	if !isValidChatChannel(channel) {
+		c.JSON(http.StatusBadRequest, gin.H{"message": "Canal de chat invalido."})
+		return
+	}
+	if channel == ChatChannelInternal && claims.Role == users.RoleClientViewer {
+		c.JSON(http.StatusForbidden, gin.H{"message": "Permissao insuficiente."})
+		return
+	}
+
+	viewerUserID := ""
+	if claims.Role == users.RoleClientViewer {
+		viewerUserID = claims.UserID
+	}
+
+	item, err := r.store.FindCalendarItem(c.Request.Context(), c.Param("itemId"), viewerUserID)
+	if errors.Is(err, ErrCalendarItemNotFound) {
+		c.JSON(http.StatusNotFound, gin.H{"message": "Postagem nao encontrada."})
+		return
+	}
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"message": "Nao foi possivel carregar a postagem."})
+		return
+	}
+
+	messages, err := r.store.ListChatMessages(c.Request.Context(), item.ID, channel)
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"message": "Nao foi possivel carregar mensagens."})
+		return
+	}
+
+	c.JSON(http.StatusOK, gin.H{"messages": messages})
+}
+
+func (r Routes) streamChatMessages(c *gin.Context) {
+	claims, ok := auth.ClaimsFromContext(c)
+	if !ok {
+		c.JSON(http.StatusUnauthorized, gin.H{"message": "Autenticacao obrigatoria."})
+		return
+	}
+
+	channel := strings.TrimSpace(c.Query("channel"))
+	if channel == "" {
+		channel = ChatChannelExternal
+	}
+	if !isValidChatChannel(channel) {
+		c.JSON(http.StatusBadRequest, gin.H{"message": "Canal de chat invalido."})
+		return
+	}
+	if channel == ChatChannelInternal && claims.Role == users.RoleClientViewer {
+		c.JSON(http.StatusForbidden, gin.H{"message": "Permissao insuficiente."})
+		return
+	}
+
+	viewerUserID := ""
+	if claims.Role == users.RoleClientViewer {
+		viewerUserID = claims.UserID
+	}
+
+	item, err := r.store.FindCalendarItem(c.Request.Context(), c.Param("itemId"), viewerUserID)
+	if errors.Is(err, ErrCalendarItemNotFound) {
+		c.JSON(http.StatusNotFound, gin.H{"message": "Postagem nao encontrada."})
+		return
+	}
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"message": "Nao foi possivel carregar a postagem."})
+		return
+	}
+
+	events, unsubscribe := r.chatEvents.Subscribe(item.ID, channel)
+	defer unsubscribe()
+
+	c.Header("Content-Type", "text/event-stream")
+	c.Header("Cache-Control", "no-cache")
+	c.Header("Connection", "keep-alive")
+	c.Header("X-Accel-Buffering", "no")
+
+	flusher, ok := c.Writer.(http.Flusher)
+	if !ok {
+		c.JSON(http.StatusInternalServerError, gin.H{"message": "Streaming nao suportado."})
+		return
+	}
+
+	_, _ = c.Writer.Write([]byte("event: ready\ndata: ok\n\n"))
+	flusher.Flush()
+
+	heartbeat := time.NewTicker(25 * time.Second)
+	defer heartbeat.Stop()
+
+	for {
+		select {
+		case <-c.Request.Context().Done():
+			return
+		case <-events:
+			_, _ = c.Writer.Write([]byte("event: chat\ndata: refresh\n\n"))
+			flusher.Flush()
+		case <-heartbeat.C:
+			_, _ = c.Writer.Write([]byte("event: ping\ndata: keepalive\n\n"))
+			flusher.Flush()
+		}
+	}
+}
+
+type createChatMessageRequest struct {
+	Channel string `json:"channel"`
+	Body    string `json:"body" binding:"max=4000"`
+}
+
+func (r Routes) createChatMessage(c *gin.Context) {
+	claims, ok := auth.ClaimsFromContext(c)
+	if !ok {
+		c.JSON(http.StatusUnauthorized, gin.H{"message": "Autenticacao obrigatoria."})
+		return
+	}
+
+	var input createChatMessageRequest
+	if err := c.ShouldBindJSON(&input); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"message": "Informe uma mensagem valida."})
+		return
+	}
+
+	channel := strings.TrimSpace(input.Channel)
+	if channel == "" {
+		channel = ChatChannelExternal
+	}
+	if !isValidChatChannel(channel) {
+		c.JSON(http.StatusBadRequest, gin.H{"message": "Canal de chat invalido."})
+		return
+	}
+	if channel == ChatChannelInternal && claims.Role == users.RoleClientViewer {
+		c.JSON(http.StatusForbidden, gin.H{"message": "Permissao insuficiente."})
+		return
+	}
+
+	body := strings.TrimSpace(input.Body)
+	if body == "" {
+		c.JSON(http.StatusBadRequest, gin.H{"message": "Informe uma mensagem valida."})
+		return
+	}
+
+	viewerUserID := ""
+	if claims.Role == users.RoleClientViewer {
+		viewerUserID = claims.UserID
+	}
+
+	item, err := r.store.FindCalendarItem(c.Request.Context(), c.Param("itemId"), viewerUserID)
+	if errors.Is(err, ErrCalendarItemNotFound) {
+		c.JSON(http.StatusNotFound, gin.H{"message": "Postagem nao encontrada."})
+		return
+	}
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"message": "Nao foi possivel carregar a postagem."})
+		return
+	}
+
+	message, err := r.store.CreateChatMessage(c.Request.Context(), CreateChatMessageInput{
+		CalendarItemID: item.ID,
+		Channel:        channel,
+		Body:           body,
+		CreatedBy:      claims.UserID,
+	})
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"message": "Nao foi possivel enviar a mensagem."})
+		return
+	}
+
+	_ = r.store.RecordAudit(c.Request.Context(), claims.UserID, "chat_message.created", "calendar_item", item.ID, map[string]any{
+		"channel": channel,
+	})
+
+	r.chatEvents.Publish(item.ID, channel)
+
+	c.JSON(http.StatusCreated, gin.H{"message": message})
+}
+
+type updateChatMessageRequest struct {
+	Body string `json:"body" binding:"required,min=1,max=4000"`
+}
+
+func (r Routes) updateChatMessage(c *gin.Context) {
+	claims, ok := auth.ClaimsFromContext(c)
+	if !ok {
+		c.JSON(http.StatusUnauthorized, gin.H{"message": "Autenticacao obrigatoria."})
+		return
+	}
+
+	var input updateChatMessageRequest
+	if err := c.ShouldBindJSON(&input); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"message": "Informe uma mensagem valida."})
+		return
+	}
+
+	message, err := r.authorizedChatMessage(c, claims, c.Param("messageId"), true)
+	if err != nil {
+		return
+	}
+	if message.DeletedAt != nil {
+		c.JSON(http.StatusNotFound, gin.H{"message": "Mensagem nao encontrada."})
+		return
+	}
+	if len(message.Attachments) > 0 {
+		c.JSON(http.StatusBadRequest, gin.H{"message": "Mensagens com anexos nao podem ser editadas."})
+		return
+	}
+
+	updated, err := r.store.UpdateChatMessage(c.Request.Context(), message.ID, strings.TrimSpace(input.Body))
+	if errors.Is(err, ErrChatMessageNotFound) {
+		c.JSON(http.StatusNotFound, gin.H{"message": "Mensagem nao encontrada."})
+		return
+	}
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"message": "Nao foi possivel editar a mensagem."})
+		return
+	}
+
+	r.chatEvents.Publish(updated.CalendarItemID, updated.Channel)
+
+	c.JSON(http.StatusOK, gin.H{"message": updated})
+}
+
+func (r Routes) deleteChatMessage(c *gin.Context) {
+	claims, ok := auth.ClaimsFromContext(c)
+	if !ok {
+		c.JSON(http.StatusUnauthorized, gin.H{"message": "Autenticacao obrigatoria."})
+		return
+	}
+
+	message, err := r.authorizedChatMessage(c, claims, c.Param("messageId"), true)
+	if err != nil {
+		return
+	}
+	if message.DeletedAt != nil {
+		c.JSON(http.StatusNotFound, gin.H{"message": "Mensagem nao encontrada."})
+		return
+	}
+
+	deleted, err := r.store.DeleteChatMessage(c.Request.Context(), message.ID)
+	if errors.Is(err, ErrChatMessageNotFound) {
+		c.JSON(http.StatusNotFound, gin.H{"message": "Mensagem nao encontrada."})
+		return
+	}
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"message": "Nao foi possivel excluir a mensagem."})
+		return
+	}
+
+	r.chatEvents.Publish(deleted.CalendarItemID, deleted.Channel)
+
+	c.JSON(http.StatusOK, gin.H{"message": deleted})
+}
+
+func (r Routes) uploadChatAttachment(c *gin.Context) {
+	claims, ok := auth.ClaimsFromContext(c)
+	if !ok {
+		c.JSON(http.StatusUnauthorized, gin.H{"message": "Autenticacao obrigatoria."})
+		return
+	}
+
+	message, err := r.authorizedChatMessage(c, claims, c.Param("messageId"), false)
+	if err != nil {
+		return
+	}
+	if message.DeletedAt != nil {
+		c.JSON(http.StatusNotFound, gin.H{"message": "Mensagem nao encontrada."})
+		return
+	}
+	if message.CreatedBy == nil || *message.CreatedBy != claims.UserID {
+		c.JSON(http.StatusForbidden, gin.H{"message": "Permissao insuficiente."})
+		return
+	}
+
+	upload, err := r.saveUploadedFile(c, filepath.Join("chat", message.ID))
+	if err != nil {
+		return
+	}
+
+	attachment, err := r.store.CreateChatAttachment(c.Request.Context(), CreateChatAttachmentInput{
+		ChatMessageID:    message.ID,
+		OriginalFilename: upload.originalFilename,
+		StoredFilename:   upload.storedFilename,
+		MimeType:         upload.mimeType,
+		SizeBytes:        upload.sizeBytes,
+		StorageDriver:    r.storageDriver,
+		StoragePath:      upload.storagePath,
+		CreatedBy:        claims.UserID,
+	})
+	if err != nil {
+		_ = os.Remove(upload.storagePath)
+		c.JSON(http.StatusInternalServerError, gin.H{"message": "Nao foi possivel registrar o anexo."})
+		return
+	}
+
+	r.chatEvents.Publish(message.CalendarItemID, message.Channel)
+
+	c.JSON(http.StatusCreated, gin.H{"attachment": attachment})
+}
+
+func (r Routes) downloadChatAttachment(c *gin.Context) {
+	claims, ok := auth.ClaimsFromContext(c)
+	if !ok {
+		c.JSON(http.StatusUnauthorized, gin.H{"message": "Autenticacao obrigatoria."})
+		return
+	}
+
+	viewerUserID := ""
+	if claims.Role == users.RoleClientViewer {
+		viewerUserID = claims.UserID
+	}
+
+	attachment, err := r.store.FindChatAttachment(c.Request.Context(), c.Param("attachmentId"), viewerUserID)
+	if errors.Is(err, ErrAttachmentNotFound) {
+		c.JSON(http.StatusNotFound, gin.H{"message": "Anexo nao encontrado."})
+		return
+	}
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"message": "Nao foi possivel carregar o anexo."})
+		return
+	}
+
+	c.Header("Content-Type", attachment.MimeType)
+	c.Header("Content-Disposition", `attachment; filename="`+strings.ReplaceAll(attachment.OriginalFilename, `"`, "")+`"`)
+	c.File(attachment.StoragePath)
+}
+
+func (r Routes) authorizedChatMessage(c *gin.Context, claims auth.Claims, messageID string, requireOwner bool) (ChatMessage, error) {
+	message, err := r.store.FindChatMessage(c.Request.Context(), messageID)
+	if errors.Is(err, ErrChatMessageNotFound) {
+		c.JSON(http.StatusNotFound, gin.H{"message": "Mensagem nao encontrada."})
+		return ChatMessage{}, err
+	}
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"message": "Nao foi possivel carregar a mensagem."})
+		return ChatMessage{}, err
+	}
+	if message.Channel == ChatChannelInternal && claims.Role == users.RoleClientViewer {
+		c.JSON(http.StatusForbidden, gin.H{"message": "Permissao insuficiente."})
+		return ChatMessage{}, errors.New("forbidden")
+	}
+
+	viewerUserID := ""
+	if claims.Role == users.RoleClientViewer {
+		viewerUserID = claims.UserID
+	}
+	if _, err := r.store.FindCalendarItem(c.Request.Context(), message.CalendarItemID, viewerUserID); err != nil {
+		if errors.Is(err, ErrCalendarItemNotFound) {
+			c.JSON(http.StatusNotFound, gin.H{"message": "Postagem nao encontrada."})
+		} else {
+			c.JSON(http.StatusInternalServerError, gin.H{"message": "Nao foi possivel carregar a postagem."})
+		}
+		return ChatMessage{}, err
+	}
+
+	if requireOwner && claims.Role != users.RoleSuperAdmin && (message.CreatedBy == nil || *message.CreatedBy != claims.UserID) {
+		c.JSON(http.StatusForbidden, gin.H{"message": "Permissao insuficiente."})
+		return ChatMessage{}, errors.New("forbidden")
+	}
+
+	return message, nil
+}
+
 func (r Routes) uploadAttachment(c *gin.Context) {
 	claims, ok := auth.ClaimsFromContext(c)
 	if !ok || (claims.Role != users.RoleSuperAdmin && claims.Role != users.RoleAgencyUser) {
@@ -611,75 +991,23 @@ func (r Routes) uploadAttachment(c *gin.Context) {
 		return
 	}
 
-	c.Request.Body = http.MaxBytesReader(c.Writer, c.Request.Body, r.uploadMaxSizeBytes)
-	file, header, err := c.Request.FormFile("file")
+	upload, err := r.saveUploadedFile(c, c.Param("itemId"))
 	if err != nil {
-		c.JSON(http.StatusBadRequest, gin.H{"message": "Envie um arquivo valido."})
-		return
-	}
-	defer file.Close()
-
-	if header.Size > r.uploadMaxSizeBytes {
-		c.JSON(http.StatusBadRequest, gin.H{"message": "Arquivo acima do limite permitido."})
-		return
-	}
-
-	head := make([]byte, 512)
-	n, err := file.Read(head)
-	if err != nil && err != io.EOF {
-		c.JSON(http.StatusBadRequest, gin.H{"message": "Nao foi possivel ler o arquivo."})
-		return
-	}
-	if _, err := file.Seek(0, io.SeekStart); err != nil {
-		c.JSON(http.StatusInternalServerError, gin.H{"message": "Nao foi possivel processar o arquivo."})
-		return
-	}
-
-	mimeType := http.DetectContentType(head[:n])
-	if len(r.uploadAllowedMIMEs) > 0 && !r.uploadAllowedMIMEs[mimeType] {
-		c.JSON(http.StatusBadRequest, gin.H{"message": "Tipo de arquivo nao permitido."})
-		return
-	}
-
-	storedFilename, err := randomStoredFilename(header.Filename)
-	if err != nil {
-		c.JSON(http.StatusInternalServerError, gin.H{"message": "Nao foi possivel preparar o arquivo."})
-		return
-	}
-
-	itemDir := filepath.Join(r.storageLocalPath, c.Param("itemId"))
-	if err := os.MkdirAll(itemDir, 0o750); err != nil {
-		c.JSON(http.StatusInternalServerError, gin.H{"message": "Nao foi possivel preparar o armazenamento."})
-		return
-	}
-
-	storagePath := filepath.Join(itemDir, storedFilename)
-	destination, err := os.OpenFile(storagePath, os.O_CREATE|os.O_EXCL|os.O_WRONLY, 0o640)
-	if err != nil {
-		c.JSON(http.StatusInternalServerError, gin.H{"message": "Nao foi possivel salvar o arquivo."})
-		return
-	}
-	defer destination.Close()
-
-	sizeBytes, err := io.Copy(destination, file)
-	if err != nil {
-		_ = os.Remove(storagePath)
-		c.JSON(http.StatusInternalServerError, gin.H{"message": "Nao foi possivel salvar o arquivo."})
 		return
 	}
 
 	attachment, err := r.store.CreateAttachment(c.Request.Context(), CreateAttachmentInput{
 		CalendarItemID:   c.Param("itemId"),
-		OriginalFilename: filepath.Base(header.Filename),
-		StoredFilename:   storedFilename,
-		MimeType:         mimeType,
-		SizeBytes:        sizeBytes,
+		OriginalFilename: upload.originalFilename,
+		StoredFilename:   upload.storedFilename,
+		MimeType:         upload.mimeType,
+		SizeBytes:        upload.sizeBytes,
 		StorageDriver:    r.storageDriver,
-		StoragePath:      storagePath,
+		StoragePath:      upload.storagePath,
 		CreatedBy:        claims.UserID,
 	})
 	if err != nil {
-		_ = os.Remove(storagePath)
+		_ = os.Remove(upload.storagePath)
 		c.JSON(http.StatusInternalServerError, gin.H{"message": "Nao foi possivel registrar o anexo."})
 		return
 	}
@@ -694,6 +1022,96 @@ func (r Routes) uploadAttachment(c *gin.Context) {
 	c.JSON(http.StatusCreated, gin.H{"attachment": attachment})
 }
 
+type savedUpload struct {
+	originalFilename string
+	storedFilename   string
+	mimeType         string
+	sizeBytes        int64
+	storagePath      string
+}
+
+func (r Routes) saveUploadedFile(c *gin.Context, relativeDir string) (savedUpload, error) {
+	c.Request.Body = http.MaxBytesReader(c.Writer, c.Request.Body, r.uploadMaxSizeBytes)
+	file, header, err := c.Request.FormFile("file")
+	if err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"message": "Envie um arquivo valido."})
+		return savedUpload{}, err
+	}
+	defer file.Close()
+
+	if header.Size > r.uploadMaxSizeBytes {
+		c.JSON(http.StatusBadRequest, gin.H{"message": "Arquivo acima do limite permitido."})
+		return savedUpload{}, errors.New("file too large")
+	}
+
+	head := make([]byte, 512)
+	n, err := file.Read(head)
+	if err != nil && err != io.EOF {
+		c.JSON(http.StatusBadRequest, gin.H{"message": "Nao foi possivel ler o arquivo."})
+		return savedUpload{}, err
+	}
+	if _, err := file.Seek(0, io.SeekStart); err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"message": "Nao foi possivel processar o arquivo."})
+		return savedUpload{}, err
+	}
+
+	mimeType := normalizeUploadMimeType(http.DetectContentType(head[:n]), header.Filename)
+	if len(r.uploadAllowedMIMEs) > 0 && !r.uploadAllowedMIMEs[mimeType] {
+		c.JSON(http.StatusBadRequest, gin.H{"message": "Tipo de arquivo nao permitido."})
+		return savedUpload{}, errors.New("invalid mime")
+	}
+
+	storedFilename, err := randomStoredFilename(header.Filename)
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"message": "Nao foi possivel preparar o arquivo."})
+		return savedUpload{}, err
+	}
+
+	storageDir := filepath.Join(r.storageLocalPath, filepath.Clean(relativeDir))
+	if err := os.MkdirAll(storageDir, 0o750); err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"message": "Nao foi possivel preparar o armazenamento."})
+		return savedUpload{}, err
+	}
+
+	storagePath := filepath.Join(storageDir, storedFilename)
+	destination, err := os.OpenFile(storagePath, os.O_CREATE|os.O_EXCL|os.O_WRONLY, 0o640)
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"message": "Nao foi possivel salvar o arquivo."})
+		return savedUpload{}, err
+	}
+	defer destination.Close()
+
+	sizeBytes, err := io.Copy(destination, file)
+	if err != nil {
+		_ = os.Remove(storagePath)
+		c.JSON(http.StatusInternalServerError, gin.H{"message": "Nao foi possivel salvar o arquivo."})
+		return savedUpload{}, err
+	}
+
+	return savedUpload{
+		originalFilename: filepath.Base(header.Filename),
+		storedFilename:   storedFilename,
+		mimeType:         mimeType,
+		sizeBytes:        sizeBytes,
+		storagePath:      storagePath,
+	}, nil
+}
+
+func normalizeUploadMimeType(detected string, filename string) string {
+	switch strings.ToLower(filepath.Ext(filename)) {
+	case ".docx":
+		if detected == "application/zip" || detected == "application/octet-stream" {
+			return "application/vnd.openxmlformats-officedocument.wordprocessingml.document"
+		}
+	case ".doc":
+		if detected == "application/octet-stream" {
+			return "application/msword"
+		}
+	}
+
+	return detected
+}
+
 func (r Routes) downloadAttachment(c *gin.Context) {
 	claims, ok := auth.ClaimsFromContext(c)
 	if !ok {
@@ -721,6 +1139,37 @@ func (r Routes) downloadAttachment(c *gin.Context) {
 	c.File(attachment.StoragePath)
 }
 
+func (r Routes) deleteAttachment(c *gin.Context) {
+	claims, ok := auth.ClaimsFromContext(c)
+	if !ok || (claims.Role != users.RoleSuperAdmin && claims.Role != users.RoleAgencyUser) {
+		c.JSON(http.StatusForbidden, gin.H{"message": "Permissao insuficiente."})
+		return
+	}
+
+	attachment, err := r.store.DeleteAttachment(c.Request.Context(), c.Param("attachmentId"))
+	if errors.Is(err, ErrAttachmentNotFound) {
+		c.JSON(http.StatusNotFound, gin.H{"message": "Anexo nao encontrado."})
+		return
+	}
+	if err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"message": "Nao foi possivel excluir o anexo."})
+		return
+	}
+
+	if attachment.StorageDriver == "local" {
+		_ = os.Remove(attachment.StoragePath)
+	}
+
+	_ = r.store.RecordAudit(c.Request.Context(), claims.UserID, "attachment.deleted", "calendar_item_attachment", attachment.ID, map[string]any{
+		"calendar_item_id": attachment.CalendarItemID,
+		"filename":         attachment.OriginalFilename,
+		"mime_type":        attachment.MimeType,
+		"size_bytes":       attachment.SizeBytes,
+	})
+
+	c.JSON(http.StatusOK, gin.H{"attachment": attachment})
+}
+
 func randomStoredFilename(original string) (string, error) {
 	bytes := make([]byte, 16)
 	if _, err := rand.Read(bytes); err != nil {
@@ -738,3 +1187,12 @@ func isValidCalendarItemStatus(status string) bool {
 		return false
 	}
 }
+
+func isValidChatChannel(channel string) bool {
+	switch channel {
+	case ChatChannelExternal, ChatChannelInternal:
+		return true
+	default:
+		return false
+	}
+}