Huami: Add PAI fetch operation (no db persistence)

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/devices/huami/HuamiService.java

@@ -224,6 +224,7 @@ public class HuamiService {
     public static final byte COMMAND_ACTIVITY_DATA_TYPE_ACTIVTY = 0x01;
     public static final byte COMMAND_ACTIVITY_DATA_TYPE_MANUAL_HEART_RATE = 0x02;
     public static final byte COMMAND_ACTIVITY_DATA_XXX_DATE = 0x02; // issued on first connect, followd by COMMAND_XXXX_ACTIVITY_DATA instead of COMMAND_FETCH_DATA
+    public static final byte COMMAND_ACTIVITY_DATA_TYPE_PAI = 0x0d;
     public static final byte COMMAND_ACTIVITY_DATA_TYPE_STRESS_MANUAL = 0x12;
     public static final byte COMMAND_ACTIVITY_DATA_TYPE_STRESS_AUTOMATIC = 0x13;
     public static final byte COMMAND_ACTIVITY_DATA_TYPE_SPO2_NORMAL = 0x25;

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/huami/operations/FetchPaiOperation.java

@@ -0,0 +1,91 @@
+/*  Copyright (C) 2023 José Rebelo
+
+    This file is part of Gadgetbridge.
+
+    Gadgetbridge is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as published
+    by the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    Gadgetbridge is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>. */
+package nodomain.freeyourgadget.gadgetbridge.service.devices.huami.operations;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+import java.util.GregorianCalendar;
+
+import nodomain.freeyourgadget.gadgetbridge.devices.huami.HuamiService;
+import nodomain.freeyourgadget.gadgetbridge.service.devices.huami.HuamiSupport;
+import nodomain.freeyourgadget.gadgetbridge.util.GB;
+
+/**
+ * An operation that fetches PAI data.
+ */
+public class FetchPaiOperation extends AbstractRepeatingFetchOperation {
+    private static final Logger LOG = LoggerFactory.getLogger(FetchPaiOperation.class);
+
+    public FetchPaiOperation(final HuamiSupport support) {
+        super(support, HuamiService.COMMAND_ACTIVITY_DATA_TYPE_PAI, "pai data");
+    }
+
+    @Override
+    protected boolean handleActivityData(final GregorianCalendar timestamp, final byte[] bytes) {
+        final ByteBuffer buf = ByteBuffer.wrap(bytes).order(ByteOrder.LITTLE_ENDIAN);
+
+        while (buf.position() < bytes.length) {
+            final int type = buf.get() & 0xff;
+
+            if (type != 5) {
+                LOG.error("Unsupported PAI type {}", type);
+                return false;
+            }
+
+            final long timestampSeconds = buf.getInt();
+            timestamp.setTimeInMillis(timestampSeconds * 1000L);
+            final byte utcOffsetInQuarterHours = buf.get();
+
+            byte[] unknown1 = new byte[31];
+            buf.get(unknown1);
+
+            final float paiLow = buf.getFloat();
+            final float paiModerate = buf.getFloat();
+            final float paiHigh = buf.getFloat();
+            final short timeLow = buf.getShort(); // minutes
+            final short timeModerate = buf.getShort(); // minutes
+            final short timeHigh = buf.getShort(); // minutes
+            final float paiToday = buf.getFloat();
+            final float paiTotal = buf.getFloat();
+
+            byte[] unknown2 = new byte[39];
+            buf.get(unknown2);
+
+            LOG.debug(
+                    "PAI at {} + {}: paiLow={} paiModerate={} paiHigh={} timeLow={} timeMid={} timeHigh={} paiToday={} paiTotal={} unknown1={} unknown2={}",
+                    timestamp.getTime(), utcOffsetInQuarterHours,
+                    paiLow, paiModerate, paiHigh,
+                    timeLow, timeModerate, timeHigh,
+                    paiToday, paiTotal,
+                    GB.hexdump(unknown1),
+                    GB.hexdump(unknown2)
+            );
+
+            // TODO save
+        }
+
+        return true;
+    }
+
+    @Override
+    protected String getLastSyncTimeKey() {
+        return "lastPaiTimeMillis";
+    }
+}