refactor(ai): align AI client with OpenAI chat completions API

Update request endpoint to /v1/chat/completions and switch payload key
from input to messages. Remove store flag and legacy Perplexity response
parsing to standardize on OpenAI's content extraction.

src/ai/ai_client.c

@@ -1435,13 +1435,17 @@ ai_session_switch(AISession* session, const gchar* provider_name,
  * This is the thread-safe variant used by _ai_request_thread() which holds
  * the session lock while calling it.
  *
+ * Custom provider settings are merged into the payload as additional JSON
+ * key-value pairs alongside "model" and "input".
+ *
+ * @param provider The AI provider (for custom settings)
  * @param model The model identifier
  * @param history GList of AIMessage* (must be held under session lock)
  * @param prompt The new user prompt to append
  * @return Newly allocated JSON string (caller must free)
  */
 static gchar*
-_build_json_payload_from_list(const gchar* model, GList* history, const gchar* prompt)
+_build_json_payload_from_list(AIProvider* provider, const gchar* model, GList* history, const gchar* prompt)
 {
     GString* messages_json = g_string_new("");
     GList* curr = history;
@@ -1468,11 +1472,37 @@ _build_json_payload_from_list(const gchar* model, GList* history, const gchar* p
     g_string_append_printf(messages_json, "{\"role\":\"user\",\"content\":\"%s\"}", escaped_prompt);
 
     auto_gchar gchar* escaped_model = ai_json_escape(model);
-    gchar* json_payload = g_strdup_printf(
-        "{\"model\":\"%s\",\"input\":[%s],\"stream\":false,\"store\":false}",
-        escaped_model, messages_json->str);
+
+    /* Build custom settings JSON fragment */
+    GString* custom_json = g_string_new("");
+    if (provider && provider->settings) {
+        GHashTableIter iter;
+        gpointer key, value;
+        g_hash_table_iter_init(&iter, provider->settings);
+        while (g_hash_table_iter_next(&iter, &key, &value)) {
+            auto_gchar gchar* escaped_key = ai_json_escape((gchar*)key);
+            auto_gchar gchar* escaped_val = ai_json_escape((gchar*)value);
+            if (custom_json->len > 0) {
+                g_string_append_c(custom_json, ',');
+            }
+            g_string_append_printf(custom_json, "\"%s\": %s", escaped_key, escaped_val);
+        }
+    }
+
+    /* Assemble final payload: model, messages, custom settings, then fixed keys */
+    gchar* json_payload;
+    if (custom_json->len > 0) {
+        json_payload = g_strdup_printf(
+            "{\"model\":\"%s\",\"messages\":[%s],%s,\"stream\":false}",
+            escaped_model, messages_json->str, custom_json->str);
+    } else {
+        json_payload = g_strdup_printf(
+            "{\"model\":\"%s\",\"messages\":[%s],\"stream\":false}",
+            escaped_model, messages_json->str);
+    }
 
     g_string_free(messages_json, TRUE);
+    g_string_free(custom_json, TRUE);
     return json_payload;
 }
 
@@ -1482,12 +1512,7 @@ ai_parse_response(const gchar* response_json)
     if (!response_json || strlen(response_json) == 0)
         return NULL;
 
-    /* Perplexity /v1/agent: {"output":[{"content":[{"text":"...","type":"output_text"}]}]}
-     * Legacy OpenAI:        {"choices":[{"message":{"content":"..."}}]} */
-    gchar* text = _extract_json_string(response_json, "text");
-    if (text)
-        return text;
-
+    /* OpenAI /v1/chat/completions: {"choices":[{"message":{"content":"..."}}]} */
     return _extract_json_string(response_json, "content");
 }
 
@@ -1566,7 +1591,7 @@ _ai_request_thread(gpointer data)
     /* Build JSON payload from history + prompt (under lock), then add user message to history */
     log_debug("[AI-THREAD] Building JSON payload...");
     pthread_mutex_lock(&session->lock);
-    auto_gchar gchar* json_payload = _build_json_payload_from_list(local_model, session->history, prompt);
+    auto_gchar gchar* json_payload = _build_json_payload_from_list(local_provider, local_model, session->history, prompt);
 
     /* Add user message to history now (it's in JSON but not yet in history) */
     AIMessage* user_msg = g_new0(AIMessage, 1);
@@ -1587,7 +1612,7 @@ _ai_request_thread(gpointer data)
 
     /* Build request URL */
     const gchar* api_url = local_provider->api_url;
-    auto_gchar gchar* request_url = g_strdup_printf("%s%sv1/responses", api_url, g_str_has_suffix(api_url, "/") ? "" : "/");
+    auto_gchar gchar* request_url = g_strdup_printf("%s%sv1/chat/completions", api_url, g_str_has_suffix(api_url, "/") ? "" : "/");
     log_debug("[AI-THREAD] API URL: %s", api_url);
     log_debug("[AI-THREAD] API Request URL: %s", request_url);
     log_debug("[AI-THREAD] Model: %s", local_model);

src/gitversion.h.in

@@ -1,6 +0,0 @@
-#ifndef PROF_GIT_BRANCH
-#define PROF_GIT_BRANCH @PROF_GIT_BRANCH@
-#endif
-#ifndef PROF_GIT_REVISION
-#define PROF_GIT_REVISION @PROF_GIT_REVISION@
-#endif

src/pgp/gpg.c

@@ -519,13 +519,15 @@ p_gpg_sign(const gchar* const str, const gchar* const fp)
 }
 
 gchar*
-p_gpg_encrypt(const gchar* const barejid, const gchar* const message, const gchar* const fp)
+p_gpg_encrypt(const gchar* const barejid, const gchar* const message, const gchar* const fp, gchar** err)
 {
     ProfPGPPubKeyId* pubkeyid = g_hash_table_lookup(pubkeys, barejid);
     if (!pubkeyid) {
+        *err = g_strdup("No PGP key found for recipient");
         return NULL;
     }
     if (!pubkeyid->id) {
+        *err = g_strdup("No key ID found for recipient");
         return NULL;
     }
 
@@ -538,6 +540,7 @@ p_gpg_encrypt(const gchar* const barejid, const gchar* const message, const gcha
     gpgme_ctx_t ctx;
     gpgme_error_t error = gpgme_new(&ctx);
     if (error) {
+        *err = g_strdup_printf("Failed to create GPGME context: %s %s", gpgme_strsource(error), gpgme_strerror(error));
         log_error("GPG: Failed to create gpgme context. %s %s", gpgme_strsource(error), gpgme_strerror(error));
         return NULL;
     }
@@ -545,6 +548,7 @@ p_gpg_encrypt(const gchar* const barejid, const gchar* const message, const gcha
     gpgme_key_t receiver_key;
     error = gpgme_get_key(ctx, pubkeyid->id, &receiver_key, 0);
     if (error || receiver_key == NULL) {
+        *err = g_strdup_printf("Failed to get receiver key '%s': %s %s", pubkeyid->id, gpgme_strsource(error), gpgme_strerror(error));
         log_error("GPG: Failed to get receiver_key. %s %s", gpgme_strsource(error), gpgme_strerror(error));
         gpgme_release(ctx);
         return NULL;
@@ -554,8 +558,10 @@ p_gpg_encrypt(const gchar* const barejid, const gchar* const message, const gcha
     gpgme_key_t sender_key = NULL;
     error = gpgme_get_key(ctx, fp, &sender_key, 0);
     if (error || sender_key == NULL) {
+        *err = g_strdup_printf("Failed to get sender key '%s': %s %s", fp, gpgme_strsource(error), gpgme_strerror(error));
         log_error("GPG: Failed to get sender_key. %s %s", gpgme_strsource(error), gpgme_strerror(error));
         gpgme_release(ctx);
+        gpgme_key_unref(receiver_key);
         return NULL;
     }
     keys[1] = sender_key;
@@ -574,7 +580,8 @@ p_gpg_encrypt(const gchar* const barejid, const gchar* const message, const gcha
     gpgme_key_unref(sender_key);
 
     if (error) {
-        log_error("GPG: Failed to encrypt message. %s %s", gpgme_strsource(error), gpgme_strerror(error));
+        *err = g_strdup_printf("Encryption failed: (%s) %s", gpgme_strsource(error), gpgme_strerror(error));
+        log_error("GPG: Failed to encrypt message. (%s) %s", gpgme_strsource(error), gpgme_strerror(error));
         return NULL;
     }
 

src/pgp/gpg.h

@@ -42,7 +42,7 @@ gboolean p_gpg_available(const gchar* const barejid);
 const gchar* p_gpg_libver(void);
 gchar* p_gpg_sign(const gchar* const str, const gchar* const fp);
 void p_gpg_verify(const gchar* const barejid, const gchar* const sign);
-gchar* p_gpg_encrypt(const gchar* const barejid, const gchar* const message, const gchar* const fp);
+gchar* p_gpg_encrypt(const gchar* const barejid, const gchar* const message, const gchar* const fp, gchar** err);
 gchar* p_gpg_decrypt(const gchar* const cipher);
 void p_gpg_free_decrypted(gchar* decrypted);
 gchar* p_gpg_autocomplete_key(const gchar* const search_str, gboolean previous, void* context);

src/ui/window.c

@@ -43,7 +43,7 @@
 #include "ai/ai_client.h"
 
 static const int PAD_MIN_HEIGHT = 100;
-static const int PAD_THRESHOLD = 12000; // above buffer cap (~9000): reclaims dead pad space, never fires while scrolling
+static const int PAD_DEAD_SPACE_LIMIT = 2000; // reclaim once the pad holds this much dead space (cursor past live buffer); size-independent, so it never fires while scrolling
 static gboolean _in_redraw = FALSE;
 
 static void
@@ -56,9 +56,10 @@ _win_ensure_pad_capacity(ProfWin* window, WINDOW* win, int lines_needed)
     int cur_height = getmaxy(win);
     int cur_width = getmaxx(win);
     if (lines_needed >= cur_height - 1) {
-        // If we are getting too large, trigger a redraw to clean up old lines
-        // but only if we are not already in a redraw process.
-        if (window && cur_height >= PAD_THRESHOLD && !_in_redraw) {
+        // redraw to reclaim dead pad space (cursor far past live buffer, e.g. a long
+        // append-only session); dead space never accrues while scrolling, only here
+        int dead = window ? getcury(win) - window->layout->buffer->lines : 0;
+        if (window && dead > PAD_DEAD_SPACE_LIMIT && !_in_redraw) {
             win_redraw(window);
         } else {
             // resize to required lines + some buffer for next messages

src/xmpp/message.c

@@ -467,12 +467,15 @@ message_send_chat_pgp(const char* const barejid, const char* const msg, gboolean
     auto_char char* jid = chat_session_get_jid(barejid);
     char* id = connection_create_stanza_id();
 
+    ProfWin* current = wins_get_current();
+
     xmpp_stanza_t* message = NULL;
 #ifdef HAVE_LIBGPGME
     ProfAccount* account = accounts_get_account(session_get_account_name());
     if (account->pgp_keyid) {
         auto_jid Jid* jidp = jid_create(jid);
-        auto_gchar gchar* encrypted = p_gpg_encrypt(jidp->barejid, msg, account->pgp_keyid);
+        auto_gchar gchar* err = NULL;
+        auto_gchar gchar* encrypted = p_gpg_encrypt(jidp->barejid, msg, account->pgp_keyid, &err);
         if (encrypted) {
             message = xmpp_message_new(ctx, STANZA_TYPE_CHAT, jid, id);
             xmpp_message_set_body(message, "This message is encrypted (XEP-0027).");
@@ -486,18 +489,31 @@ message_send_chat_pgp(const char* const barejid, const char* const msg, gboolean
             xmpp_stanza_add_child(message, x);
             xmpp_stanza_release(x);
         } else {
-            message = xmpp_message_new(ctx, STANZA_TYPE_CHAT, jid, id);
-            xmpp_message_set_body(message, msg);
+            if (current) {
+                win_println(current, THEME_ERROR, "-", "Unable to encrypt message for %s: %s.", jid, err);
+            }
+            log_error("Message not encrypted for %s: %s.", jid, err);
+            account_free(account);
+            free(id);
+            return NULL;
         }
     } else {
-        message = xmpp_message_new(ctx, STANZA_TYPE_CHAT, jid, id);
-        xmpp_message_set_body(message, msg);
+        if (current) {
+            win_println(current, THEME_ERROR, "-", "No PGP key configured for this account.");
+        }
+        log_error("No PGP key configured, message not sent.");
+        account_free(account);
+        free(id);
+        return NULL;
     }
     account_free(account);
 #else
-    // ?
-    message = xmpp_message_new(ctx, STANZA_TYPE_CHAT, jid, id);
-    xmpp_message_set_body(message, msg);
+    if (current) {
+        win_println(current, THEME_ERROR, "-", "LibGPGME not available, message not sent.");
+    }
+    log_error("LibGPGME not available, message not sent.");
+    free(id);
+    return NULL;
 #endif
 
     if (state) {
@@ -546,7 +562,10 @@ message_send_chat_ox(const char* const barejid, const char* const msg, gboolean
     xmpp_stanza_to_text(signcrypt, &c, &s);
     char* signcrypt_e = p_ox_gpg_signcrypt(account->jid, barejid, c);
     if (signcrypt_e == NULL) {
-        cons_show("Unable to send OX message. Check log file and profanity-ox-setup man page for details.");
+        ProfWin* current = wins_get_current();
+        if (current) {
+            win_println(current, THEME_ERROR, "-", "Unable to send OX message. Check log file and profanity-ox-setup man page for details.");
+        }
         log_error("Message not signcrypted.");
         return NULL;
     }