sandbergja commented on code in PR #5257:
URL: https://github.com/apache/solr/pull/5257#discussion_r4413127142


##########
ui/shared/src/commonMain/kotlin/org/apache/solr/ui/views/indexquery/IndexQueryHeader.kt:
##########
@@ -0,0 +1,222 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.solr.ui.views.indexquery
+
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.layout.widthIn
+import androidx.compose.material3.DropdownMenuItem
+import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.material3.ExposedDropdownMenuAnchorType
+import androidx.compose.material3.ExposedDropdownMenuBox
+import androidx.compose.material3.ExposedDropdownMenuDefaults
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.OutlinedTextField
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.platform.testTag
+import androidx.compose.ui.text.font.FontFamily
+import androidx.compose.ui.text.style.TextOverflow
+import androidx.compose.ui.unit.dp
+import org.apache.solr.ui.domain.RequestHandlerOption
+import org.apache.solr.ui.shared.generated.resources.Res
+import org.apache.solr.ui.shared.generated.resources.label_collection_core
+import org.apache.solr.ui.shared.generated.resources.label_request_handler
+import org.apache.solr.ui.shared.generated.resources.no_collections_available
+import org.apache.solr.ui.shared.generated.resources.no_request_handlers
+import 
org.apache.solr.ui.shared.generated.resources.placeholder_select_request_handler
+import org.jetbrains.compose.resources.stringResource
+
+/**
+ * Header of the Index & Query section with a collection dropdown and a 
request handler dropdown.
+ *
+ * The header only renders what it is given. Loading and selection happen in 
the caller.
+ *
+ * @param collections The available collection names.
+ * @param collectionsLoading Whether the collections are being loaded. 
Disables both dropdowns.
+ * @param selectedCollection The selected collection, or null.
+ * @param onSelectCollection Called with the collection the user picked.
+ * @param handlers The request handlers of the selected collection.
+ * @param handlersLoading Whether the handlers are being loaded. Disables the 
handler dropdown.
+ * @param selectedHandler The name of the selected request handler, or null.
+ * @param onSelectHandler Called with the name of the request handler the user 
picked.
+ * @param modifier Modifier to apply to the root column.
+ */
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun IndexQueryHeader(
+    collections: List<String>,
+    collectionsLoading: Boolean,
+    selectedCollection: String?,
+    onSelectCollection: (String) -> Unit,

Review Comment:
   It seems that we will repeat a similar list of arguments for anything with a 
dropdown menu: list of items, whether or not it is ready, the selected item if 
any, and the action to take on select.  9 function arguments sure seems like a 
lot!  Could it be worth it to extract it to its own `data class` or similar at 
this point?



##########
ui/shared/src/commonMain/kotlin/org/apache/solr/ui/components/indexquery/data/HttpIndexQueryRepository.kt:
##########
@@ -0,0 +1,61 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.solr.ui.components.indexquery.data
+
+import io.ktor.client.HttpClient
+import io.ktor.client.call.body
+import io.ktor.client.request.get
+import io.ktor.http.isSuccess
+import kotlinx.serialization.SerialName
+import kotlinx.serialization.Serializable
+import org.apache.solr.ui.domain.RequestHandlerOption
+
+class HttpIndexQueryRepository(private val httpClient: HttpClient) : 
IndexQueryRepository {

Review Comment:
   Could we have a unit test or two for this Repository?



##########
ui/shared/src/commonMain/kotlin/org/apache/solr/ui/views/indexquery/IndexQueryHeader.kt:
##########
@@ -0,0 +1,222 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.solr.ui.views.indexquery
+
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.layout.widthIn
+import androidx.compose.material3.DropdownMenuItem
+import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.material3.ExposedDropdownMenuAnchorType
+import androidx.compose.material3.ExposedDropdownMenuBox
+import androidx.compose.material3.ExposedDropdownMenuDefaults
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.OutlinedTextField
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.platform.testTag
+import androidx.compose.ui.text.font.FontFamily
+import androidx.compose.ui.text.style.TextOverflow
+import androidx.compose.ui.unit.dp
+import org.apache.solr.ui.domain.RequestHandlerOption
+import org.apache.solr.ui.shared.generated.resources.Res
+import org.apache.solr.ui.shared.generated.resources.label_collection_core
+import org.apache.solr.ui.shared.generated.resources.label_request_handler
+import org.apache.solr.ui.shared.generated.resources.no_collections_available
+import org.apache.solr.ui.shared.generated.resources.no_request_handlers
+import 
org.apache.solr.ui.shared.generated.resources.placeholder_select_request_handler
+import org.jetbrains.compose.resources.stringResource
+
+/**
+ * Header of the Index & Query section with a collection dropdown and a 
request handler dropdown.
+ *
+ * The header only renders what it is given. Loading and selection happen in 
the caller.
+ *
+ * @param collections The available collection names.
+ * @param collectionsLoading Whether the collections are being loaded. 
Disables both dropdowns.
+ * @param selectedCollection The selected collection, or null.
+ * @param onSelectCollection Called with the collection the user picked.
+ * @param handlers The request handlers of the selected collection.
+ * @param handlersLoading Whether the handlers are being loaded. Disables the 
handler dropdown.
+ * @param selectedHandler The name of the selected request handler, or null.
+ * @param onSelectHandler Called with the name of the request handler the user 
picked.
+ * @param modifier Modifier to apply to the root column.
+ */
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun IndexQueryHeader(
+    collections: List<String>,
+    collectionsLoading: Boolean,
+    selectedCollection: String?,
+    onSelectCollection: (String) -> Unit,
+    handlers: List<RequestHandlerOption>,

Review Comment:
   `handlers` is such a generic term -- could we call them `requestHandlers` 
here?



##########
ui/shared/src/commonMain/kotlin/org/apache/solr/ui/views/indexquery/IndexQueryHeader.kt:
##########
@@ -0,0 +1,222 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.solr.ui.views.indexquery
+
+import androidx.compose.foundation.layout.Arrangement
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.width
+import androidx.compose.foundation.layout.widthIn
+import androidx.compose.material3.DropdownMenuItem
+import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.material3.ExposedDropdownMenuAnchorType
+import androidx.compose.material3.ExposedDropdownMenuBox
+import androidx.compose.material3.ExposedDropdownMenuDefaults
+import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.OutlinedTextField
+import androidx.compose.material3.Text
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Alignment
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.platform.testTag
+import androidx.compose.ui.text.font.FontFamily
+import androidx.compose.ui.text.style.TextOverflow
+import androidx.compose.ui.unit.dp
+import org.apache.solr.ui.domain.RequestHandlerOption
+import org.apache.solr.ui.shared.generated.resources.Res
+import org.apache.solr.ui.shared.generated.resources.label_collection_core
+import org.apache.solr.ui.shared.generated.resources.label_request_handler
+import org.apache.solr.ui.shared.generated.resources.no_collections_available
+import org.apache.solr.ui.shared.generated.resources.no_request_handlers
+import 
org.apache.solr.ui.shared.generated.resources.placeholder_select_request_handler
+import org.jetbrains.compose.resources.stringResource
+
+/**
+ * Header of the Index & Query section with a collection dropdown and a 
request handler dropdown.
+ *
+ * The header only renders what it is given. Loading and selection happen in 
the caller.
+ *
+ * @param collections The available collection names.
+ * @param collectionsLoading Whether the collections are being loaded. 
Disables both dropdowns.
+ * @param selectedCollection The selected collection, or null.
+ * @param onSelectCollection Called with the collection the user picked.
+ * @param handlers The request handlers of the selected collection.
+ * @param handlersLoading Whether the handlers are being loaded. Disables the 
handler dropdown.
+ * @param selectedHandler The name of the selected request handler, or null.
+ * @param onSelectHandler Called with the name of the request handler the user 
picked.
+ * @param modifier Modifier to apply to the root column.
+ */
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun IndexQueryHeader(
+    collections: List<String>,
+    collectionsLoading: Boolean,
+    selectedCollection: String?,
+    onSelectCollection: (String) -> Unit,
+    handlers: List<RequestHandlerOption>,
+    handlersLoading: Boolean,
+    selectedHandler: String?,
+    onSelectHandler: (String) -> Unit,
+    modifier: Modifier = Modifier,
+) {
+    val collectionsEnabled = !collectionsLoading && collections.isNotEmpty()
+    val handlersEnabled = !collectionsLoading &&
+        selectedCollection != null &&
+        !handlersLoading &&
+        handlers.isNotEmpty()
+
+    Column(modifier = modifier.fillMaxWidth(), verticalArrangement = 
Arrangement.spacedBy(8.dp)) {
+        Row(horizontalArrangement = Arrangement.spacedBy(16.dp)) {
+            HeaderDropdown(
+                label = stringResource(Res.string.label_collection_core),
+                value = selectedCollection,
+                placeholder = "",
+                enabled = collectionsEnabled,
+                entries = collections.map { DropdownEntry(key = it, title = 
it) },
+                onSelect = onSelectCollection,
+                testTag = "index_query_collection_dropdown",
+                modifier = Modifier.width(256.dp),
+            )
+            HeaderDropdown(
+                label = stringResource(Res.string.label_request_handler),
+                value = selectedHandler,
+                placeholder = 
stringResource(Res.string.placeholder_select_request_handler),
+                enabled = handlersEnabled,
+                entries = handlers.map {
+                    DropdownEntry(key = it.name, title = it.name, subtitle = 
it.className)
+                },
+                supporting = handlers.firstOrNull { it.name == selectedHandler 
}?.className,
+                onSelect = onSelectHandler,
+                testTag = "index_query_handler_dropdown",
+                modifier = Modifier.width(384.dp),
+            )
+        }
+        if (!collectionsLoading && collections.isEmpty()) {
+            Text(
+                text = stringResource(Res.string.no_collections_available),
+                style = MaterialTheme.typography.bodyMedium,
+                color = MaterialTheme.colorScheme.onSurfaceVariant,
+                modifier = Modifier.testTag("index_query_no_collections"),
+            )
+        }
+        if (selectedCollection != null && !handlersLoading && 
handlers.isEmpty()) {
+            Text(
+                text = stringResource(Res.string.no_request_handlers),
+                style = MaterialTheme.typography.bodyMedium,
+                color = MaterialTheme.colorScheme.onSurfaceVariant,
+                modifier = Modifier.testTag("index_query_no_handlers"),
+            )
+        }
+    }
+}
+
+private data class DropdownEntry(
+    val key: String,
+    val title: String,
+    val subtitle: String? = null,
+)
+
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+private fun HeaderDropdown(

Review Comment:
   Thanks for extracting this into its own composable -- I think that's a great 
move.  I don't think it needs to be private to this file, though -- it would be 
a nice composable to share throughout the UI I think (for example, with the 
existing `ConfigsetsDropdown` composable).



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