[FIX] im_livechat: reset livechat when session cannot be persisted

Before this PR, failing to persist a livechat thread would
stuck the livechat session in an incoherent state, preventing
the user to open a livechat. This PR ensures the thread service
does not write anything if there is no session.

closes odoo/odoo#129699

X-original-commit: d4e8b62fa8f008cd4ab7d69e413115cb35a6ac33
Signed-off-by: Alexandre Kühn (aku) <aku@odoo.com>
Signed-off-by: Matthieu Stockbauer (tsm) <tsm@odoo.com>

addons/im_livechat/static/src/embed/core/thread_service_patch.js

@@ -134,17 +134,17 @@ patch(ThreadService.prototype, "im_livechat", {
                 });
             }
             onChange(thread, "state", () => {
-                if (this.livechatService.state !== SESSION_STATE.CLOSED) {
+                if ([SESSION_STATE.CLOSED, SESSION_STATE.NONE].includes(thread.state)) {
                     this.livechatService.updateSession({ state: thread.state });
                 }
             });
             onChange(thread, "seen_message_id", () => {
-                if (this.livechatService.state !== SESSION_STATE.CLOSED) {
+                if ([SESSION_STATE.CLOSED, SESSION_STATE.NONE].includes(thread.state)) {
                     this.livechatService.updateSession({ seen_message_id: thread.seen_message_id });
                 }
             });
             onChange(thread, "message_unread_counter", () => {
-                if (this.livechatService.state !== SESSION_STATE.CLOSED) {
+                if ([SESSION_STATE.CLOSED, SESSION_STATE.NONE].includes(thread.state)) {
                     this.livechatService.updateSession({ channel: thread.channel });
                 }
             });

addons/im_livechat/static/src/embed/core_ui/livechat_button.js

@@ -11,6 +11,7 @@ import { debounce } from "@web/core/utils/timing";
 
 export class LivechatButton extends Component {
     static template = "im_livechat.LivechatButton";
+    static DEBOUNCE_DELAY = 500;
 
     setup() {
         this.store = useStore();
@@ -20,7 +21,9 @@ export class LivechatButton extends Component {
         this.livechatService = useState(useService("im_livechat.livechat"));
         /** @type {import('@mail/core/common/thread_service').ThreadService} */
         this.threadService = useService("mail.thread");
-        this.onClick = debounce(this.onClick.bind(this), 500, { leading: true });
+        this.onClick = debounce(this.onClick.bind(this), LivechatButton.DEBOUNCE_DELAY, {
+            leading: true,
+        });
     }
 
     onClick() {

addons/im_livechat/static/tests/embed/livechat_session_tests.js

@@ -3,11 +3,12 @@
 import { startServer } from "@bus/../tests/helpers/mock_python_environment";
 
 import { loadDefaultConfig, setCookie, start } from "@im_livechat/../tests/embed/helper/test_utils";
+import { LivechatButton } from "@im_livechat/embed/core_ui/livechat_button";
 
 import { Command } from "@mail/../tests/helpers/command";
-import { afterNextRender, insertText } from "@mail/../tests/helpers/test_utils";
+import { afterNextRender, click, insertText } from "@mail/../tests/helpers/test_utils";
 
-import { triggerHotkey } from "@web/../tests/helpers/utils";
+import { mockTimeout, triggerHotkey } from "@web/../tests/helpers/utils";
 
 QUnit.module("livechat session");
 
@@ -37,3 +38,27 @@ QUnit.test("Unsuccessful message post shows session expired", async (assert) =>
     assert.containsOnce($, ".o_notification:contains(Session expired)");
     assert.containsNone($, ".o-mail-ChatWindow");
 });
+
+QUnit.test("Session is reset after failing to persist the channel", async (assert) => {
+    await startServer();
+    await loadDefaultConfig();
+    const { advanceTime } = mockTimeout();
+    await start({
+        mockRPC(route, args) {
+            if (route === "/im_livechat/get_session" && args.persisted) {
+                return false;
+            }
+        },
+    });
+    await click(".o-livechat-LivechatButton");
+    await insertText(".o-mail-Composer-input", "Hello World!");
+    await afterNextRender(() => triggerHotkey("Enter"));
+    assert.containsOnce(
+        $,
+        ".o_notification:contains(No available collaborator, please try again later.)"
+    );
+    assert.containsOnce($, ".o-livechat-LivechatButton");
+    await advanceTime(LivechatButton.DEBOUNCE_DELAY + 10);
+    await click(".o-livechat-LivechatButton");
+    assert.containsOnce($, ".o-mail-ChatWindow");
+});