[gnome-music/wip/jfelder/lastfm-ui-part-2: 2/7] scrobbler: Add a "not available" state

[Jean Felder <jfelder src gnome org>]

commit d6d97aead8e42f97584fabdb58314ae9c541a91c
Author: Jean Felder <jfelder src gnome org>
Date:   Tue Jan 14 21:02:40 2020 +0100

    scrobbler: Add a "not available" state
    
    GNOME onlince accounts can be compiled without Last.fm support. In
    that case, it is useless to look for an existing account. It also
    means that no account can be configured.

 gnomemusic/scrobbler.py       | 46 +++++++++++++++++++++++++++++++++++--------
 gnomemusic/widgets/appmenu.py |  2 +-
 2 files changed, 39 insertions(+), 9 deletions(-)
---
diff --git a/gnomemusic/scrobbler.py b/gnomemusic/scrobbler.py
index 331b1ba0..bd3cd308 100644
--- a/gnomemusic/scrobbler.py
+++ b/gnomemusic/scrobbler.py
@@ -39,11 +39,18 @@ class GoaLastFM(GObject.GObject):
     """
 
     class State(IntEnum):
-        """GoaLastFM account State"""
+        """GoaLastFM account State.
 
-        NOT_CONFIGURED = 0
-        DISABLED = 1
-        ENABLED = 2
+        NOT_AVAILABLE: GOA does not handle Last.fm accounts
+        NOT_CONFIGURED: GOA handles Last.fm but no user account has
+                        been configured
+        DISABLED: a user account exists, but it is disabled
+        ENABLED: a user account exists and is enabled
+        """
+        NOT_AVAILABLE = 0
+        NOT_CONFIGURED = 1
+        DISABLED = 2
+        ENABLED = 3
 
     def __init__(self):
         super().__init__()
@@ -51,15 +58,15 @@ class GoaLastFM(GObject.GObject):
         self._log = MusicLogger()
 
         self._client = None
+        self._state = GoaLastFM.State.NOT_AVAILABLE
+        self.notify("state")
         self._reset_attributes()
         Goa.Client.new(None, self._new_client_callback)
 
     def _reset_attributes(self):
         self._account = None
         self._authentication = None
-        self._state = GoaLastFM.State.NOT_CONFIGURED
         self._music_disabled_id = None
-        self.notify("state")
 
     def _new_client_callback(self, source, result):
         try:
@@ -69,6 +76,27 @@ class GoaLastFM(GObject.GObject):
                 Goa.Error(error.code), error.message))
             return
 
+        manager = self._client.get_manager()
+        try:
+            manager.call_is_supported_provider(
+                "lastfm", None, self._lastfm_is_supported_cb)
+        except TypeError:
+            self._log.warning("Error: Unable to check if last.fm is supported")
+
+    def _lastfm_is_supported_cb(self, proxy, result):
+        try:
+            lastfm_supported = proxy.call_is_supported_provider_finish(result)
+        except GLib.Error as e:
+            self._log.warning(
+                "Error: Unable to check if last.fm is supported: {}".format(
+                    e.message))
+            return
+
+        if lastfm_supported is False:
+            return
+
+        self._state = GoaLastFM.State.NOT_CONFIGURED
+        self.notify("state")
         self._client.connect("account-added", self._goa_account_added)
         self._client.connect("account-removed", self._goa_account_removed)
         self._find_lastfm_account()
@@ -80,7 +108,9 @@ class GoaLastFM(GObject.GObject):
         account = obj.get_account()
         if account.props.provider_type == "lastfm":
             self._account.disconnect(self._music_disabled_id)
+            self._state = GoaLastFM.State.NOT_CONFIGURED
             self._reset_attributes()
+            self.notify("state")
 
     def _find_lastfm_account(self):
         accounts = self._client.get_accounts()
@@ -152,7 +182,7 @@ class LastFmScrobbler(GObject.GObject):
         self._report = self._settings.get_boolean("lastfm-report")
 
         self._scrobbled = False
-        self._account_state = GoaLastFM.State.NOT_CONFIGURED
+        self._account_state = GoaLastFM.State.NOT_AVAILABLE
 
         self._goa_lastfm = GoaLastFM()
         self._goa_lastfm.bind_property(
@@ -161,7 +191,7 @@ class LastFmScrobbler(GObject.GObject):
         self._soup_session = Soup.Session.new()
         self._scrobble_cache = []
 
-    @GObject.Property(type=int, default=GoaLastFM.State.NOT_CONFIGURED)
+    @GObject.Property(type=int, default=GoaLastFM.State.NOT_AVAILABLE)
     def account_state(self):
         """Get the Last.fm account state
 
diff --git a/gnomemusic/widgets/appmenu.py b/gnomemusic/widgets/appmenu.py
index 80590751..997be53d 100644
--- a/gnomemusic/widgets/appmenu.py
+++ b/gnomemusic/widgets/appmenu.py
@@ -51,7 +51,7 @@ class AppMenu(Gtk.PopoverMenu):
 
     def _on_scrobbler_state_changed(self, klass, args):
         state = self._lastfm_scrobbler.props.account_state
-        if state == GoaLastFM.State.NOT_CONFIGURED:
+        if state <= GoaLastFM.State.NOT_CONFIGURED:
             self._lastfm_box.props.sensitive = False
             if self._lastfm_switcher_id is not None:
                 self._lastfm_switch.disconnect(self._lastfm_switcher_id)