val fileFromExternalStorage = DocumentFileCompat.fromSimplePath(context, basePath = "Downloads/MyMovie.mp4")

val fileFromSdCard = DocumentFileCompat.fromSimplePath(context, storageId = "9016-4EF8", basePath = "Downloads/MyMovie.mp4")

val myVideo = MediaStoreCompat.fromFileName(context, MediaType.DOWNLOADS, "MyMovie.mp4")

val imageList = MediaStoreCompat.fromMediaType(context, MediaType.IMAGE)

class MainActivity : AppCompatActivity() {

    private val storage = SimpleStorage(this)

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        setupSimpleStorage()
        btnRequestStorageAccess.setOnClickListener {
            storage.requestStorageAccess(REQUEST_CODE_STORAGE_ACCESS)
        }
    }

    private fun setupSimpleStorage() {
        storage.storageAccessCallback = object : StorageAccessCallback {
            override fun onRootPathNotSelected(
                requestCode: Int,
                rootPath: String,
                uri: Uri,
                selectedStorageType: StorageType,
                expectedStorageType: StorageType
            ) {
                MaterialDialog(this@MainActivity)
                    .message(text = "Please select $rootPath")
                    .negativeButton(android.R.string.cancel)
                    .positiveButton {
                        val initialRoot = if (expectedStorageType.isExpected(selectedStorageType)) selectedStorageType else expectedStorageType
                        storage.requestStorageAccess(REQUEST_CODE_STORAGE_ACCESS, initialRoot, expectedStorageType)
                    }.show()
            }

            override fun onCanceledByUser(requestCode: Int) {
                Toast.makeText(baseContext, "Canceled by user", Toast.LENGTH_SHORT).show()
            }

            override fun onStoragePermissionDenied(requestCode: Int) {
                /*
                Request runtime permissions for Manifest.permission.WRITE_EXTERNAL_STORAGE
                and Manifest.permission.READ_EXTERNAL_STORAGE
                */
            }

            override fun onRootPathPermissionGranted(requestCode: Int, root: DocumentFile) {
                Toast.makeText(baseContext, "Storage access has been granted for ${root.getStorageId(baseContext)}", Toast.LENGTH_SHORT).show()
            }
        }
    }

    override fun onSaveInstanceState(outState: Bundle) {
        storage.onSaveInstanceState(outState)
        super.onSaveInstanceState(outState)
    }

    override fun onRestoreInstanceState(savedInstanceState: Bundle) {
        super.onRestoreInstanceState(savedInstanceState)
        storage.onRestoreInstanceState(savedInstanceState)
    }

    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        super.onActivityResult(requestCode, resultCode, data)
        // Mandatory for Activity, but not for Fragment & ComponentActivity
        storage.onActivityResult(requestCode, resultCode, data)
    }

    override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<String>, grantResults: IntArray) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults)
        // Mandatory for Activity, but not for Fragment & ComponentActivity
        storage.onRequestPermissionsResult(requestCode, permissions, grantResults)
    }
}

private fun requestStoragePermission() {
    /*
    Request runtime permissions for Manifest.permission.WRITE_EXTERNAL_STORAGE
    and Manifest.permission.READ_EXTERNAL_STORAGE
    */
}

private fun setupFolderPickerCallback() {
    storage.folderPickerCallback = object : FolderPickerCallback {
        override fun onStoragePermissionDenied(requestCode: Int) {
            requestStoragePermission()
        }

        override fun onStorageAccessDenied(requestCode: Int, folder: DocumentFile?, storageType: StorageType) {
            if (storageType == StorageType.UNKNOWN) {
                requestStoragePermission()
                return
            }
            MaterialDialog(this@MainActivity)
                .message(
                    text = "You have no write access to this storage, thus selecting this folder is useless." +
                            "\nWould you like to grant access to this folder?"
                )
                .negativeButton(android.R.string.cancel)
                .positiveButton {
                    storage.requestStorageAccess(REQUEST_CODE_STORAGE_ACCESS, storageType)
                }.show()
        }

        override fun onFolderSelected(requestCode: Int, folder: DocumentFile) {
            Toast.makeText(baseContext, folder.getAbsolutePath(baseContext), Toast.LENGTH_SHORT).show()
        }

        override fun onCanceledByUser(requestCode: Int) {
            Toast.makeText(baseContext, "Folder picker canceled by user", Toast.LENGTH_SHORT).show()
        }
    }
}

private fun setupFilePickerCallback() {
    storage.filePickerCallback = object : FilePickerCallback {
        override fun onCanceledByUser(requestCode: Int) {
            Toast.makeText(baseContext, "File picker canceled by user", Toast.LENGTH_SHORT).show()
        }

        override fun onStoragePermissionDenied(requestCode: Int, file: DocumentFile?) {
            requestStoragePermission()
        }

        override fun onFileSelected(requestCode: Int, file: DocumentFile) {
            Toast.makeText(baseContext, "File selected: ${file.name}", Toast.LENGTH_SHORT).show()
        }
    }
}

class MainActivity : AppCompatActivity() {

    private val storageHelper = SimpleStorageHelper(this)

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        storageHelper.onFolderSelected = { requestCode, folder ->
            // do stuff
        }
        storageHelper.onFileSelected = { requestCode, files ->
            // do stuff
        }

        btnRequestStorageAccess.setOnClickListener { storageHelper.requestStorageAccess() }
        btnOpenFolderPicker.setOnClickListener { storageHelper.openFolderPicker() }
        btnOpenFilePicker.setOnClickListener { storageHelper.openFilePicker() }
    }

    override fun onSaveInstanceState(outState: Bundle) {
        storageHelper.onSaveInstanceState(outState)
        super.onSaveInstanceState(outState)
    }

    override fun onRestoreInstanceState(savedInstanceState: Bundle) {
        super.onRestoreInstanceState(savedInstanceState)
        storageHelper.onRestoreInstanceState(savedInstanceState)
    }

    override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
        super.onActivityResult(requestCode, resultCode, data)
        // Mandatory for Activity, but not for Fragment & ComponentActivity
        storageHelper.storage.onActivityResult(requestCode, resultCode, data)
    }

    override fun onRequestPermissionsResult(requestCode: Int, permissions: Array<String>, grantResults: IntArray) {
        super.onRequestPermissionsResult(requestCode, permissions, grantResults)
        // Mandatory for Activity, but not for Fragment & ComponentActivity
        storageHelper.onRequestPermissionsResult(requestCode, permissions, grantResults)
    }
}

val folder: DocumentFile = ...
val targetFolder: DocumentFile = ...

// Since moveFolderTo() is annotated with @WorkerThread, you must execute it in background thread
folder.moveFolderTo(applicationContext, targetFolder, skipEmptyFiles = false, callback = object : FolderCallback() {
    override fun onPrepare() {
        // Show notification or progress bar dialog with indeterminate state
    }

    override fun onCountingFiles() {
        // Inform user that the app is counting & calculating files
    }

    override fun onStart(folder: DocumentFile, totalFilesToCopy: Int, workerThread: Thread): Long {
        return 1000 // update progress every 1 second
    }

    override fun onParentConflict(destinationFolder: DocumentFile, action: FolderCallback.ParentFolderConflictAction, canMerge: Boolean) {
        handleParentFolderConflict(destinationFolder, action, canMerge)
    }

    override fun onContentConflict(
        destinationFolder: DocumentFile,
        conflictedFiles: MutableList<FolderCallback.FileConflict>,
        action: FolderCallback.FolderContentConflictAction
    ) {
        handleFolderContentConflict(action, conflictedFiles)
    }

    override fun onReport(report: Report) {
        Timber.d("onReport() -> ${report.progress.toInt()}% | Copied ${report.fileCount} files")
    }

    override fun onCompleted(result: Result) {
        Toast.makeText(baseContext, "Copied ${result.totalCopiedFiles} of ${result.totalFilesToCopy} files", Toast.LENGTH_SHORT).show()
    }

    override fun onFailed(errorCode: ErrorCode) {
        Toast.makeText(baseContext, "An error has occurred: $errorCode", Toast.LENGTH_SHORT).show()
    }
})