// Copyright 2000-2024 JetBrains s.r.o. and contributors. Use of this source code is governed by the Apache 2.0 license.
package com.intellij.configurationStore

import com.intellij.ide.highlighter.ModuleFileType
import com.intellij.openapi.application.ApplicationManager
import com.intellij.openapi.application.EDT
import com.intellij.openapi.application.writeAction
import com.intellij.openapi.components.StoragePathMacros
import com.intellij.openapi.components.service
import com.intellij.openapi.components.impl.stores.stateStore
import com.intellij.openapi.module.Module
import com.intellij.openapi.project.ModuleListener
import com.intellij.openapi.project.Project
import com.intellij.openapi.project.modifyModules
import com.intellij.openapi.project.rootManager
import com.intellij.openapi.roots.ModuleRootManagerEx
import com.intellij.openapi.roots.ModuleRootModificationUtil
import com.intellij.openapi.vfs.LocalFileSystem
import com.intellij.openapi.vfs.VirtualFile
import com.intellij.project.stateStore
import com.intellij.testFramework.*
import com.intellij.testFramework.assertions.Assertions.assertThat
import com.intellij.testFramework.rules.TempDirectory
import com.intellij.util.Function
import kotlinx.coroutines.Dispatchers
import kotlinx.coroutines.runBlocking
import kotlinx.coroutines.withContext
import org.junit.ClassRule
import org.junit.Rule
import org.junit.Test
import org.junit.rules.ExternalResource
import java.nio.file.Path
import kotlin.io.path.invariantSeparatorsPathString
import kotlin.io.path.isRegularFile
import kotlin.io.path.readText
import kotlin.properties.Delegates

private val Module.storage: FileBasedStorage
  get() = (stateStore.storageManager as StateStorageManagerImpl).getCachedFileStorages(listOf(StoragePathMacros.MODULE_FILE)).first()

@RunsInActiveStoreMode
class ChangeModuleStorePathTest {
  companion object {
    @JvmField @ClassRule val projectRule = ProjectRule()
  }

  var module: Module by Delegates.notNull()
  var dependentModule: Module by Delegates.notNull()

  // we test fireModuleRenamedByVfsEvent
  private val oldModuleNames = mutableListOf<String>()

  private val tempDirManager = TempDirectory()

  @Rule
  @JvmField
  val ruleChain = RuleChain(
    tempDirManager,
    ActiveStoreRule(projectRule),
    object : ExternalResource() {
      override fun before() {
        runBlocking {
          val moduleFileParent = tempDirManager.newDirectoryPath("dir")
          module = projectRule.createModule(moduleFileParent.resolve("m.iml"))
          dependentModule = projectRule.createModule(moduleFileParent.resolve("dependent-module.iml"))
          ModuleRootModificationUtil.addDependency(dependentModule, module)
        }

        projectRule.project.messageBus.connect(module).subscribe(ModuleListener.TOPIC, object : ModuleListener {
          override fun modulesRenamed(project: Project, modules: List<Module>, @Suppress("UsagesOfObsoleteApi") oldNameProvider: Function<in Module, String>) {
            assertThat(modules).containsOnly(module)
            oldModuleNames.add(oldNameProvider.`fun`(module))
          }
        })
      }

      // should be invoked after project tearDown
      override fun after() {
        service<StorageVirtualFileTracker>().remove {
          if (it.storageManager.componentManager === module) {
            throw AssertionError("Storage manager is not disposed, module $module, storage $it")
          }
          false
        }
      }
    },
    DisposeModulesRule(projectRule)
  )

  // project structure
  @Test
  fun `rename module using model`() = runBlocking<Unit> {
    saveProjectState()

    val storage = module.storage
    val oldFile = storage.file
    assertThat(oldFile).isRegularFile

    val oldName = module.name
    val newName = "foo"

    writeAction {
      projectRule.project.modifyModules { renameModule(module, newName) }
    }
    assertModuleFileRenamed(newName, oldFile)
    assertThat(oldModuleNames).containsOnly(oldName)
  }

  // project view
  @Test
  fun `rename module using rename virtual file`() = runBlocking {
    testRenameModule()
  }

  private suspend fun testRenameModule() {
    saveProjectState()
    val storage = module.storage
    val oldFile = storage.file
    assertThat(oldFile).isRegularFile

    val oldName = module.name
    val newName = "foo.dot"
    writeAction {
      LocalFileSystem.getInstance().refreshAndFindFileByNioFile(oldFile)!!.rename(null, "${newName}${ModuleFileType.DOT_DEFAULT_EXTENSION}")
    }
    assertModuleFileRenamed(newName, oldFile)
    assertThat(oldModuleNames).containsOnly(oldName)
  }

  // we cannot test external rename yet, because it is not supported - ModuleImpl doesn't support deleting and create events
  // (in case of external change we don't get move event, but get "delete old" and "create new")
  private suspend fun assertModuleFileRenamed(newName: String, oldFile: Path) {
    val newFile = module.storage.file
    assertThat(newFile).isRegularFile.hasFileName("${newName}${ModuleFileType.DOT_DEFAULT_EXTENSION}")
    assertThat(oldFile).doesNotExist().isNotEqualTo(newFile)

    // ensure that macro value is updated
    assertThat(module.stateStore.storageManager.expandMacro(StoragePathMacros.MODULE_FILE)).isEqualTo(newFile)
    assertThat(module.moduleNioFile).isEqualTo(newFile)

    saveProjectState()
    assertThat(dependentModule.storage.file.readText()).contains("""<orderEntry type="module" module-name="${newName}" />""")
    val stateStore = projectRule.project.stateStore
    assertThat(stateStore.projectFilePath.readText())
      .contains("""<module fileurl="file://${'$'}PROJECT_DIR${'$'}/${stateStore.projectBasePath.relativize(newFile).invariantSeparatorsPathString}"""")
  }

  @Test
  fun `rename module parent virtual dir`() = testChangeModuleParentVirtualDir { parentVirtualDir -> 
    parentVirtualDir.rename(null, "module2") 
  }

  @Test
  fun `move module parent virtual dir`() = testChangeModuleParentVirtualDir { parentVirtualDir ->
    val newParent = tempDirManager.newVirtualDirectory("newParent")
    parentVirtualDir.move(null, newParent)
  }

  private fun testChangeModuleParentVirtualDir(updateDirectoryAction: (VirtualFile) -> Unit) {
    runBlocking {
      saveProjectState()
      val storage = module.storage
      val oldFile = storage.file
      val parentVirtualDir = storage.getVirtualFile()!!.parent
      writeAction {
        updateDirectoryAction(parentVirtualDir)
      }

      val newFile = parentVirtualDir.toNioPath().resolve("${module.name}${ModuleFileType.DOT_DEFAULT_EXTENSION}")
      assertThat(newFile).isRegularFile
      assertModuleFileRenamed(module.name, oldFile)
      assertThat(oldModuleNames).isEmpty()

      testRenameModule()
    }
  }

  @Test
  fun `move iml file`() = runBlocking {
    saveProjectState()
    val imlFile = module.storage.getVirtualFile()!!
    val oldFile = imlFile.toNioPath()
    val moduleName = module.name
    writeAction { 
      imlFile.move(null, tempDirManager.newVirtualDirectory("newParent"))
    }
    val newFile = imlFile.toNioPath()
    assertThat(newFile.isRegularFile())
    assertModuleFileRenamed(moduleName, oldFile)
    assertThat(oldModuleNames).isEmpty()
  }

  @Test
  fun `rename module source root`() = runBlocking<Unit>(Dispatchers.EDT) {
    saveProjectState()
    val storage = module.storage
    val parentVirtualDir = storage.getVirtualFile()!!.parent
    val src = VfsTestUtil.createDir(parentVirtualDir, "foo")
    writeAction {
      PsiTestUtil.addSourceContentToRoots(module, src, false)
    }

    saveProjectState()

    val rootManager = module.rootManager as ModuleRootManagerEx
    val stateModificationCount = rootManager.modificationCountForTests

    writeAction {
      src.rename(null, "bar.dot")
    }

    assertThat(stateModificationCount).isLessThan(rootManager.modificationCountForTests)
  }

  private suspend fun saveProjectState() {
    projectRule.project.stateStore.save()
  }
}