handle incoming messages through MESSAGE_CREATE

libdc/include/dc/channel.h

@@ -21,7 +21,7 @@ typedef enum {
 
     /* A direct message channel for 1:1 communication
      */
-    CHANNEL_TYPE_DM_TEXT,
+    CHANNEL_TYPE_DM,
 
     /* A guild voice channel
      */
@@ -53,6 +53,7 @@ dc_channel_t dc_channel_from_json(json_t *j);
 char const *dc_channel_id(dc_channel_t c);
 
 dc_channel_type_t dc_channel_type(dc_channel_t c);
+bool dc_channel_is_dm(dc_channel_t c);
 void dc_channel_set_type(dc_channel_t c, dc_channel_type_t t);
 
 size_t dc_channel_recipients(dc_channel_t c);

libdc/include/dc/event.h

@@ -10,7 +10,9 @@ typedef struct dc_event_ *dc_event_t;
 typedef enum {
     DC_EVENT_TYPE_UNKNOWN = 0,
     DC_EVENT_TYPE_READY,
+    DC_EVENT_TYPE_MESSAGE_CREATE,
 
+    /* ^^^^^^ Make sure events are up there ^^^^^^^ */
     DC_EVENT_TYPE_LAST,
 } dc_event_type_t;
 

libdc/src/channel.c

@@ -44,6 +44,7 @@ struct dc_channel_
      */
     char *application_id;
 
+    GHashTable *messages_byid;
     GPtrArray *messages;
 };
 
@@ -69,6 +70,11 @@ static void dc_channel_free(dc_channel_t c)
         c->messages = NULL;
     }
 
+    if (c->messages_byid != NULL) {
+        g_hash_table_unref(c->messages_byid);
+        c->messages_byid = NULL;
+    }
+
     free(c);
 }
 
@@ -87,6 +93,11 @@ dc_channel_t dc_channel_new(void)
         (GDestroyNotify)dc_unref
         );
 
+    c->messages_byid = g_hash_table_new_full(
+        g_str_hash, g_str_equal,
+        free, dc_unref
+        );
+
     return dc_ref(c);
 }
 
@@ -237,6 +248,14 @@ dc_channel_type_t dc_channel_type(dc_channel_t c)
     return c->type;
 }
 
+bool dc_channel_is_dm(dc_channel_t c)
+{
+    return_if_true(c == NULL, false);
+    return (c->type == CHANNEL_TYPE_GROUP_DM ||
+            c->type == CHANNEL_TYPE_DM
+        );
+}
+
 void dc_channel_set_type(dc_channel_t c, dc_channel_type_t t)
 {
     return_if_true(c == NULL,);
@@ -292,6 +311,12 @@ void dc_channel_add_messages(dc_channel_t c, dc_message_t *m, size_t s)
     size_t i = 0;
 
     for (i = 0; i < s; i++) {
+        char const *id = dc_message_id(m[i]);
+        if (g_hash_table_contains(c->messages_byid, id)) {
+            continue;
+        }
+
+        g_hash_table_insert(c->messages_byid, strdup(id), dc_ref(m[i]));
         g_ptr_array_add(c->messages, dc_ref(m[i]));
     }
 

libdc/src/event.c

@@ -60,15 +60,15 @@ json_t *dc_event_payload(dc_event_t e)
 
 dc_event_type_t dc_event_type_code(dc_event_t e)
 {
-    static char const *types[] = {
-        "UNKNOWN",
-        "READY",
-        NULL
+    static char const *types[DC_EVENT_TYPE_LAST] = {
+        [DC_EVENT_TYPE_UNKNOWN] = "UNKNOWN",
+        [DC_EVENT_TYPE_READY] = "READY",
+        [DC_EVENT_TYPE_MESSAGE_CREATE] = "MESSAGE_CREATE",
     };
 
     int i = 0;
 
-    for (i = 0; types[i] != NULL; i++) {
+    for (i = 0; i < DC_EVENT_TYPE_LAST; i++) {
         if (strcmp(types[i], e->type) == 0) {
             return (dc_event_type_t)i;
         }

libdc/src/session.c

@@ -18,10 +18,12 @@ struct dc_session_
  */
 typedef void (*dc_session_handler_t)(dc_session_t s, dc_event_t e);
 static void dc_session_handle_ready(dc_session_t s, dc_event_t e);
+static void dc_session_handle_message_create(dc_session_t s, dc_event_t e);
 
 static dc_session_handler_t handlers[DC_EVENT_TYPE_LAST] = {
     [DC_EVENT_TYPE_UNKNOWN] = NULL,
     [DC_EVENT_TYPE_READY] = dc_session_handle_ready,
+    [DC_EVENT_TYPE_MESSAGE_CREATE] = dc_session_handle_message_create,
 };
 
 static void dc_session_free(dc_session_t s)
@@ -46,6 +48,28 @@ static void dc_session_free(dc_session_t s)
     free(s);
 }
 
+static void dc_session_handle_message_create(dc_session_t s, dc_event_t e)
+{
+    dc_message_t m = NULL;
+    json_t *r = dc_event_payload(e);
+    char const *id = NULL;
+
+    m = dc_message_from_json(r);
+    goto_if_true(m == NULL, cleanup);
+
+    id = dc_message_channel_id(m);
+    goto_if_true(m == NULL, cleanup);
+
+    if (g_hash_table_contains(s->channels, id)) {
+        dc_channel_t c = g_hash_table_lookup(s->channels, id);
+        dc_channel_add_messages(c, &m, 1);
+    }
+
+cleanup:
+
+    dc_unref(m);
+}
+
 static void dc_session_handle_ready(dc_session_t s, dc_event_t e)
 {
     json_t *r = dc_event_payload(e);
@@ -276,21 +300,28 @@ dc_channel_t dc_session_make_channel(dc_session_t s, dc_account_t *r,
     /* check if we have the channel already with those recipients
      */
     c = dc_session_channel_recipients(s, r, n);
-    return_if_true(c != NULL, c);
 
-    /* no? create new one
-     */
-    if (!dc_api_create_channel(s->api, s->login, r, n, &c)) {
-        return NULL;
+    if (c == NULL) {
+        /* no? create new one
+         */
+        if (!dc_api_create_channel(s->api, s->login, r, n, &c)) {
+            return NULL;
+        }
+
+        return_if_true(c == NULL, NULL);
+        dc_session_add_channel(s, c);
+        /* unref once to match the proper ref count after
+         * dc_session_add_channel()
+         * BUG: if dc_session_add_channel() fails this is bad
+         */
+        dc_unref(c);
     }
 
-    return_if_true(c == NULL, NULL);
-    dc_session_add_channel(s, c);
-
-    /* unref once to match the proper ref count after dc_session_add_channel()
-     * BUG: if dc_session_add_channel() fails this is bad
-     */
-    dc_unref(c);
+    if (dc_channel_messages(c) <= 0 && dc_channel_is_dm(c)) {
+        /* fetch some messages for it
+         */
+        dc_api_get_messages(s->api, s->login, c);
+    }
 
     return c;
 }