fix(#64): bound purchase spec selection retries

android/app/src/main/java/cn/ilapage/goauto/agent/automation/PurchaseRehearsalExecutor.kt

@@ -215,12 +215,9 @@ class PurchaseRehearsalExecutor(
         }
         listOf("color" to input.mappedColor, "size" to input.mappedSize).forEach { (dimension, target) ->
             if (target.isBlank()) return@forEach
-            val screen = currentScreen(input)
-            screen.problem?.let { return failure(it.code, it.message) }
-            val values = screen.dimensions.filter { it.key == dimension }.flatMap { it.values }.filter { it.text == target && it.available }
-            if (values.isEmpty()) return failure("PURCHASE_SPEC_NOT_MATCHED", "没有找到规格：$target")
-            if (values.size != 1) return failure("RULE_AMBIGUOUS", "规格 $target 匹配到多个控件")
-            when (driver.clickFresh(values.single().node)) {
+            val lookup = locateExactSpec(input, dimension, target)
+            lookup.failure?.let { return it }
+            when (driver.clickFresh(requireNotNull(lookup.node))) {
                 FreshActionResult.AMBIGUOUS -> return failure("RULE_AMBIGUOUS", "规格 $target 匹配到多个控件")
                 FreshActionResult.SUCCESS -> Unit
                 else -> return failure("RULE_ACTION_FAILED", "规格 $target 选择失败")
@@ -244,6 +241,50 @@ class PurchaseRehearsalExecutor(
         return null
     }
 
+    private data class SpecLookup(val node: SnapshotNode? = null, val failure: PurchaseExecutionOutcome? = null)
+
+    /**
+     * Searches only parsed, selectable values in the already-open spec panel.
+     * A short downward pass first restores the top when a previous action left
+     * the panel lower down; the bounded upward pass then visits lower values.
+     * Every gesture is followed by a fresh parse, and unchanged evidence ends
+     * that direction early.
+     */
+    private fun locateExactSpec(input: PurchaseExecutionInput, dimension: String, target: String): SpecLookup {
+        fun inspect(): Pair<SpecLookup?, String> {
+            val screen = currentScreen(input)
+            screen.problem?.let { return SpecLookup(failure = failure(it.code, it.message)) to "" }
+            if (!screen.specPanelOpen) {
+                return SpecLookup(failure = failure("RULE_NOT_MATCHED", "商品规格面板已经关闭")) to ""
+            }
+            val dimensionValues = screen.dimensions.filter { it.key == dimension }.flatMap { it.values }
+            val exact = dimensionValues.filter { it.text == target && it.available }
+            if (exact.size > 1) {
+                return SpecLookup(failure = failure("RULE_AMBIGUOUS", "规格 $target 匹配到多个控件")) to ""
+            }
+            if (exact.size == 1) return SpecLookup(node = exact.single().node) to ""
+            val signature = screen.dimensions.joinToString("|") { item ->
+                "${item.key}:${item.values.joinToString(",") { value -> "${value.text}:${value.available}" }}"
+            }
+            return null to signature
+        }
+
+        var inspected = inspect()
+        inspected.first?.let { return it }
+        var currentSignature = inspected.second
+        for ((direction, limit) in listOf(SwipeDirection.DOWN to 3, SwipeDirection.UP to 6)) {
+            for (attempt in 0 until limit) {
+                if (!driver.swipePurchase(direction, 350)) break
+                pause(300)
+                inspected = inspect()
+                inspected.first?.let { return it }
+                if (inspected.second == currentSignature) break
+                currentSignature = inspected.second
+            }
+        }
+        return SpecLookup(failure = failure("PURCHASE_SPEC_NOT_MATCHED", "没有找到规格：$target"))
+    }
+
     private fun setQuantity(quantity: Long): PurchaseExecutionOutcome? {
         val snapshot = driver.capture()
         pageProblem(snapshot)?.let { return it }

android/app/src/test/java/cn/ilapage/goauto/agent/PurchaseRehearsalExecutorTest.kt

@@ -63,6 +63,18 @@ class PurchaseRehearsalExecutorTest {
         assertEquals("spec_probe_completed", outcome.resultType)
         assertEquals("{\"dimensions\":[]}", outcome.probedSpecs)
         assertFalse(driver.clicked.contains("黑色加绒"))
+        assertTrue(driver.swipeCount <= 11)
+    }
+
+    @Test
+    fun `exact size below the visible panel is found after a bounded vertical search`() {
+        val driver = FakePurchaseDriver(hiddenSizeUntilUpSwipes = 3)
+        val outcome = PurchaseRehearsalExecutor(driver, { driver.browser = true; true }, { null }, pause = {})
+            .execute(input(), PurchaseRuleParser.parse(rule()), PurchaseAgentCapabilities.supported)
+
+        assertEquals("rehearsal_completed", outcome.resultType)
+        assertTrue(driver.clicked.contains("XL"))
+        assertEquals(3, driver.upSwipeCount)
     }
 
     @Test
@@ -209,6 +221,7 @@ class PurchaseRehearsalExecutorTest {
         private val duplicateOpen: Boolean = false,
         private val bottomPurchaseEntry: Boolean = false,
         private val includeReviewEntry: Boolean = false,
+        private val hiddenSizeUntilUpSwipes: Int = 0,
     ) : PurchaseUiDriver {
         var browser = false
         var panel = false
@@ -216,6 +229,7 @@ class PurchaseRehearsalExecutorTest {
         var size: String? = null
         var quantity = 1L
         var swipeCount = 0
+        var upSwipeCount = 0
         val clicked = mutableListOf<String>()
 
         override fun capture(): UiSnapshot {
@@ -251,7 +265,8 @@ class PurchaseRehearsalExecutorTest {
                 nodes += node("scroll/color-$index", value, 20 + index * 220, 470, 200 + index * 220, 540, clickable = true, selected = color == value, parentPath = "scroll")
             }
             nodes += node("scroll/size-heading", "尺码", 20, 650, 300, 690, parentPath = "scroll")
-            nodes += node("scroll/size", "XL", 20, 710, 200, 780, clickable = true, selected = size == "XL", parentPath = "scroll")
+            val visibleSize = if (upSwipeCount >= hiddenSizeUntilUpSwipes) "XL" else "S"
+            nodes += node("scroll/size", visibleSize, 20, 710, 200, 780, clickable = true, selected = size == visibleSize, parentPath = "scroll")
             nodes += node("quantity", quantity.toString(), 400, 800, 600, 870, className = "android.widget.EditText")
             nodes += node("confirm", "确定", 20, 900, 500, 980, clickable = true)
             nodes += node("order", "提交订单", 20, 1100, 500, 1180, clickable = true)
@@ -279,6 +294,7 @@ class PurchaseRehearsalExecutorTest {
 
         override fun swipePurchase(direction: SwipeDirection, durationMs: Long): Boolean {
             swipeCount++
+            if (direction == SwipeDirection.UP) upSwipeCount++
             return true
         }