Log controller event details in verbose log

I wanted to automate a few actions using 'adb shell input' commands, but
it requires pixel coordinates. Logging event details
from scrcpy is helpful for achieving that.

app/src/android/input.h

@@ -91,6 +91,8 @@ enum android_input_event_type {
 
 /**
  * Key event actions.
+ *
+ * Also keep `android_keyevent_action_descriptions` updated.
  */
 enum android_keyevent_action {
     /** The key has been pressed down. */
@@ -194,7 +196,10 @@ enum android_keyevent_flags {
  */
 #define AMOTION_EVENT_ACTION_POINTER_INDEX_SHIFT 8
 
-/** Motion event actions */
+/** Motion event actions
+ *
+ * Also keep `android_motionevent_action_descriptions` updated.
+ */
 enum android_motionevent_action {
     /** Bit mask of the parts of the action code that are the action itself. */
     AMOTION_EVENT_ACTION_MASK = 0xff,

app/src/controller.c

@@ -4,6 +4,34 @@
 
 #include "util/log.h"
 
+/**
+ * Map an "enum" value from array to a string, without crashing on an
+ * out-of-bounds value.
+ */
+#define ENUM_TO_DESCRIPTION(descriptions, value) \
+    ((size_t) (value) < (sizeof(descriptions)/sizeof(descriptions[0])) ? descriptions[value] : "???")
+
+static const char *android_keyevent_action_descriptions[] = {
+    "down",
+    "up",
+    "multi",
+};
+static const char *android_motionevent_action_descriptions[] = {
+    "down",
+    "up",
+    "move",
+    "cancel",
+    "outside",
+    "ponter-down",
+    "pointer-up",
+    "hover-move",
+    "scroll",
+    "hover-enter"
+    "hover-exit",
+    "btn-press",
+    "btn-release",
+};
+
 bool
 controller_init(struct controller *controller, socket_t control_socket) {
     cbuf_init(&controller->queue);
@@ -45,9 +73,67 @@ controller_destroy(struct controller *controller) {
     receiver_destroy(&controller->receiver);
 }
 
+void
+control_msg_log(const struct control_msg *msg) {
+    switch(msg->type) {
+        case CONTROL_MSG_TYPE_INJECT_KEYCODE:
+            LOGV("Event: key %s code=%u repeat=%u meta=%06x",
+                 ENUM_TO_DESCRIPTION(android_keyevent_action_descriptions,
+                                     msg->inject_keycode.action),
+                 msg->inject_keycode.keycode,
+                 msg->inject_keycode.repeat,
+                 msg->inject_keycode.metastate
+            );
+            break;
+        case CONTROL_MSG_TYPE_INJECT_TEXT:
+            LOGV("Event: text \"%s\"", msg->inject_text.text);
+            break;
+        case CONTROL_MSG_TYPE_INJECT_TOUCH_EVENT:
+            LOGV("Event: touch %s position=%ux%u pressure=%f buttons=%06x",
+                 ENUM_TO_DESCRIPTION(android_keyevent_action_descriptions,
+                                     msg->inject_touch_event.action & AMOTION_EVENT_ACTION_MASK),
+                 msg->inject_touch_event.position.point.x,
+                 msg->inject_touch_event.position.point.y,
+                 msg->inject_touch_event.pressure,
+                 msg->inject_touch_event.buttons
+            );
+            break;
+        case CONTROL_MSG_TYPE_INJECT_SCROLL_EVENT:
+            // TODO
+//            write_position(&buf[1], &msg->inject_scroll_event.position);
+//            buffer_write32be(&buf[13],
+//                             (uint32_t) msg->inject_scroll_event.hscroll);
+//            buffer_write32be(&buf[17],
+//                             (uint32_t) msg->inject_scroll_event.vscroll);
+        case CONTROL_MSG_TYPE_BACK_OR_SCREEN_ON:
+            // TODO
+//            buf[1] = msg->inject_keycode.action;
+        case CONTROL_MSG_TYPE_SET_CLIPBOARD: {
+            // TODO
+//            buf[1] = !!msg->set_clipboard.paste;
+//            size_t len = write_string(msg->set_clipboard.text,
+//                                      CONTROL_MSG_CLIPBOARD_TEXT_MAX_LENGTH,
+//                                      &buf[2]);
+        }
+        case CONTROL_MSG_TYPE_SET_SCREEN_POWER_MODE:
+            // TODO
+//            buf[1] = msg->set_screen_power_mode.mode;
+        case CONTROL_MSG_TYPE_EXPAND_NOTIFICATION_PANEL:
+        case CONTROL_MSG_TYPE_EXPAND_SETTINGS_PANEL:
+        case CONTROL_MSG_TYPE_COLLAPSE_PANELS:
+        case CONTROL_MSG_TYPE_GET_CLIPBOARD:
+        case CONTROL_MSG_TYPE_ROTATE_DEVICE:
+            // TODO
+            // no additional data
+        default:
+            LOGV("Event: unknown type: %u", (unsigned) msg->type);
+    }
+}
+
 bool
 controller_push_msg(struct controller *controller,
                       const struct control_msg *msg) {
+    control_msg_log(msg);
     sc_mutex_lock(&controller->mutex);
     bool was_empty = cbuf_is_empty(&controller->queue);
     bool res = cbuf_push(&controller->queue, *msg);