[FIR IDE] Properly handle generic types qualifiers

In code like `foo.Bar<Bazz>`, `Bar<Bazz>` is considered to be
`KtCallExpression` from the PSI point

^KT-52779 Fixed

analysis/analysis-api-fir/src/org/jetbrains/kotlin/analysis/api/fir/components/KtFirImportOptimizer.kt

@@ -37,6 +37,7 @@ import org.jetbrains.kotlin.psi.psiUtil.getCallNameExpression
 import org.jetbrains.kotlin.psi.psiUtil.getPossiblyQualifiedCallExpression
 import org.jetbrains.kotlin.psi.psiUtil.unwrapNullability
 import org.jetbrains.kotlin.resolve.ImportPath
+import org.jetbrains.kotlin.resolve.calls.util.getCalleeExpressionIfAny
 import org.jetbrains.kotlin.util.OperatorNameConventions
 
 internal class KtFirImportOptimizer(
@@ -323,11 +324,14 @@ private sealed interface TypeQualifier {
 
         private val dotQualifier: KtDotQualifiedExpression? = qualifier as? KtDotQualifiedExpression
 
-        private val typeNameReference: KtNameReferenceExpression = when (qualifier) {
+        private val typeNameReference: KtNameReferenceExpression = run {
-            is KtDotQualifiedExpression -> qualifier.selectorExpression as? KtNameReferenceExpression
+            require(qualifier is KtNameReferenceExpression || qualifier is KtDotQualifiedExpression || qualifier is KtCallExpression) {
-            is KtNameReferenceExpression -> qualifier
+                "Unexpected qualifier '${qualifier.text}' of type '${qualifier::class}'"
-            else -> null
+            }
-        } ?: error("Cannot get referenced name from '${qualifier.text}'")
+
+            qualifier.getCalleeExpressionIfAny() as? KtNameReferenceExpression
+                ?: error("Cannot get referenced name from '${qualifier.text}'")
+        }
 
         override val referencedByName: Name
             get() = typeNameReference.getReferencedNameAsName()

analysis/analysis-api-fir/tests-gen/org/jetbrains/kotlin/analysis/api/fir/test/cases/generated/cases/components/importOptimizer/FirIdeNormalAnalysisSourceModuleAnalysisApiImportOptimizerTestGenerated.java

@@ -58,6 +58,12 @@ public class FirIdeNormalAnalysisSourceModuleAnalysisApiImportOptimizerTestGener
         runTest("analysis/analysis-api/testData/components/importOptimizer/analyseImports/unusedFunctionImports.kt");
     }
 
+    @Test
+    @TestMetadata("unusedGenericTypeQualifier.kt")
+    public void testUnusedGenericTypeQualifier() throws Exception {
+        runTest("analysis/analysis-api/testData/components/importOptimizer/analyseImports/unusedGenericTypeQualifier.kt");
+    }
+
     @Test
     @TestMetadata("unusedInvokeOperatorImport.kt")
     public void testUnusedInvokeOperatorImport() throws Exception {
@@ -82,6 +88,12 @@ public class FirIdeNormalAnalysisSourceModuleAnalysisApiImportOptimizerTestGener
         runTest("analysis/analysis-api/testData/components/importOptimizer/analyseImports/usedFunctionImport.kt");
     }
 
+    @Test
+    @TestMetadata("usedGenericTypeQualifier.kt")
+    public void testUsedGenericTypeQualifier() throws Exception {
+        runTest("analysis/analysis-api/testData/components/importOptimizer/analyseImports/usedGenericTypeQualifier.kt");
+    }
+
     @Test
     @TestMetadata("usedInvokeOperatorAliasedImport.kt")
     public void testUsedInvokeOperatorAliasedImport() throws Exception {

analysis/analysis-api-standalone/tests-gen/org/jetbrains/kotlin/analysis/api/standalone/fir/test/cases/generated/cases/components/importOptimizer/FirStandaloneNormalAnalysisSourceModuleAnalysisApiImportOptimizerTestGenerated.java

@@ -58,6 +58,12 @@ public class FirStandaloneNormalAnalysisSourceModuleAnalysisApiImportOptimizerTe
         runTest("analysis/analysis-api/testData/components/importOptimizer/analyseImports/unusedFunctionImports.kt");
     }
 
+    @Test
+    @TestMetadata("unusedGenericTypeQualifier.kt")
+    public void testUnusedGenericTypeQualifier() throws Exception {
+        runTest("analysis/analysis-api/testData/components/importOptimizer/analyseImports/unusedGenericTypeQualifier.kt");
+    }
+
     @Test
     @TestMetadata("unusedInvokeOperatorImport.kt")
     public void testUnusedInvokeOperatorImport() throws Exception {
@@ -82,6 +88,12 @@ public class FirStandaloneNormalAnalysisSourceModuleAnalysisApiImportOptimizerTe
         runTest("analysis/analysis-api/testData/components/importOptimizer/analyseImports/usedFunctionImport.kt");
     }
 
+    @Test
+    @TestMetadata("usedGenericTypeQualifier.kt")
+    public void testUsedGenericTypeQualifier() throws Exception {
+        runTest("analysis/analysis-api/testData/components/importOptimizer/analyseImports/usedGenericTypeQualifier.kt");
+    }
+
     @Test
     @TestMetadata("usedInvokeOperatorAliasedImport.kt")
     public void testUsedInvokeOperatorAliasedImport() throws Exception {

analysis/analysis-api/testData/components/importOptimizer/analyseImports/unusedGenericTypeQualifier.imports

@@ -0,0 +1 @@
+dependency.Bar

analysis/analysis-api/testData/components/importOptimizer/analyseImports/unusedGenericTypeQualifier.kt

@@ -0,0 +1,17 @@
+// FILE: main.kt
+package test
+
+import dependency.Bar
+
+class MyClass
+
+fun usage() {
+    val a = dependency.Bar<MyClass>::foo
+}
+
+// FILE: dependency.kt
+package dependency
+
+class Bar<T> {
+    fun foo() {}
+}

analysis/analysis-api/testData/components/importOptimizer/analyseImports/usedGenericTypeQualifier.kt

@@ -0,0 +1,17 @@
+// FILE: main.kt
+package test
+
+import dependency.Bar
+
+class MyClass
+
+fun usage() {
+    val a = Bar<MyClass>::foo
+}
+
+// FILE: dependency.kt
+package dependency
+
+class Bar<T> {
+    fun foo() {}
+}