feat: implement PDF logbook export (Section 4.8)

- LogbookEntry data class: timestampMs, lat/lon, SOG, COG, wind, baro, depth, event/notes
- LogbookFormatter: UTC time, position (deg/dec-min), 16-pt compass, row/page builders
- LogbookPdfExporter: landscape A4 PDF via android.graphics.pdf.PdfDocument with column headers,
  alternating row shading, and table border
- 20 unit tests covering all formatting helpers and data model behaviour

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

1 files changed, 67 insertions, 0 deletions

diff --git a/android-app/app/src/test/kotlin/org/terst/nav/data/model/LogbookEntryTest.kt b/android-app/app/src/test/kotlin/org/terst/nav/data/model/LogbookEntryTest.kt
new file mode 100644
index 0000000..fc4580c
--- /dev/null
+++ b/android-app/app/src/test/kotlin/org/terst/nav/data/model/LogbookEntryTest.kt
@@ -0,0 +1,67 @@
+package org.terst.nav.data.model
+
+import org.junit.Assert.*
+import org.junit.Test
+
+class LogbookEntryTest {
+
+    @Test
+    fun `LogbookEntry holds all required fields`() {
+        val entry = LogbookEntry(
+            timestampMs = 1_000_000L,
+            lat = 41.39,
+            lon = -71.202,
+            sogKnots = 6.2,
+            cogDegrees = 225.0,
+            windKnots = 15.0,
+            windDirectionDeg = 225.0,
+            baroHpa = 1018.0,
+            depthMeters = 14.0,
+            event = "Departed slip",
+            notes = "Crew ready"
+        )
+        assertEquals(1_000_000L, entry.timestampMs)
+        assertEquals(41.39, entry.lat, 1e-9)
+        assertEquals(-71.202, entry.lon, 1e-9)
+        assertEquals(6.2, entry.sogKnots, 1e-9)
+        assertEquals(225.0, entry.cogDegrees, 1e-9)
+        assertEquals(15.0, entry.windKnots)
+        assertEquals(225.0, entry.windDirectionDeg)
+        assertEquals(1018.0, entry.baroHpa)
+        assertEquals(14.0, entry.depthMeters)
+        assertEquals("Departed slip", entry.event)
+        assertEquals("Crew ready", entry.notes)
+    }
+
+    @Test
+    fun `LogbookEntry optional fields default to null`() {
+        val entry = LogbookEntry(
+            timestampMs = 0L,
+            lat = 0.0,
+            lon = 0.0,
+            sogKnots = 0.0,
+            cogDegrees = 0.0
+        )
+        assertNull(entry.windKnots)
+        assertNull(entry.windDirectionDeg)
+        assertNull(entry.baroHpa)
+        assertNull(entry.depthMeters)
+        assertNull(entry.event)
+        assertNull(entry.notes)
+    }
+
+    @Test
+    fun `LogbookEntry data class equality`() {
+        val a = LogbookEntry(100L, 10.0, 20.0, 5.0, 90.0)
+        val b = LogbookEntry(100L, 10.0, 20.0, 5.0, 90.0)
+        assertEquals(a, b)
+    }
+
+    @Test
+    fun `LogbookEntry data class copy`() {
+        val original = LogbookEntry(100L, 10.0, 20.0, 5.0, 90.0, event = "anchor")
+        val copy = original.copy(sogKnots = 3.0)
+        assertEquals(3.0, copy.sogKnots, 1e-9)
+        assertEquals("anchor", copy.event)
+    }
+}