1 files changed, 36 insertions, 2 deletions
diff --git a/data.h b/data.h
index 6fabbe6..6b6e936 100644
--- a/data.h
+++ b/data.h
@@ -1,2 +1,36 @@
-void add_roster_item(const char* jid, const char* subscription, const char* name);
-void* data_get_chat_page(void* roster_item_widget);
+#ifndef DATA_H
+#define DATA_H
+
+// https://www.rfc-editor.org/rfc/rfc6121#section-2.1.2.5
+typedef enum {
+	SUB_NONE,
+	SUB_TO,
+	SUB_FROM,
+	SUB_BOTH
+} subscription_t;
+
+typedef struct _message_t {
+	char* content;
+	char* sender_jid;
+	struct _message_t* next;
+	void* widget;
+} message_t;
+
+typedef struct _chat_t {
+	message_t* messages;
+	void* widget;
+} chat_t;
+
+typedef struct _roster_item_t {
+	char* name;  // could be NULL
+	char* jid;
+	subscription_t sub;
+	chat_t* chat;
+	struct _roster_item_t* next;
+	void* widget;
+} roster_item_t;
+
+void data_add_roster_item(const char* jid, const char* subscription,
+                          const char* name);
+void data_add_incoming_message(const char* sender_jid, const char* content);
+#endif