/*
 * Copyright (C) 2025 The Android Open Source Project
 *
 * Licensed 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 com.android.privatespace

import android.content.Context
import android.multiuser.Flags
import android.os.statsd.privatespace.FileSizeBucket
import android.os.statsd.privatespace.NotificationEventType
import android.os.statsd.privatespace.OperationType
import android.os.statsd.privatespace.TransferResult
import android.platform.test.annotations.RequiresFlagsEnabled
import android.platform.test.flag.junit.CheckFlagsRule
import android.platform.test.flag.junit.DeviceFlagsValueProvider
import android.util.StatsEvent
import android.util.StatsEventTestUtils
import android.util.StatsLog
import androidx.compose.ui.test.assertIsDisplayed
import androidx.compose.ui.test.junit4.createComposeRule
import androidx.compose.ui.test.onNodeWithTag
import androidx.compose.ui.test.onNodeWithText
import androidx.compose.ui.test.performClick
import androidx.test.core.app.ApplicationProvider
import androidx.test.ext.junit.runners.AndroidJUnit4
import com.android.dx.mockito.inline.extended.ExtendedMockito
import com.android.dx.mockito.inline.extended.ExtendedMockito.mockitoSession
import com.google.common.truth.Truth.assertThat
import com.google.protobuf.ExtensionRegistryLite
import java.util.stream.Collectors.toList
import org.junit.After
import org.junit.Before
import org.junit.Rule
import org.junit.Test
import org.junit.runner.RunWith
import org.mockito.Captor
import org.mockito.MockitoSession
import org.mockito.kotlin.argumentCaptor
import org.mockito.kotlin.atLeastOnce
import org.mockito.kotlin.mock
import org.mockito.kotlin.verify
import org.mockito.kotlin.whenever

@RequiresFlagsEnabled(Flags.FLAG_ENABLE_MOVING_CONTENT_INTO_PRIVATE_SPACE)
@RunWith(AndroidJUnit4::class)
class PrivateSpaceActivityScreenTest {

    @get:Rule val checkFlagsRule: CheckFlagsRule = DeviceFlagsValueProvider.createCheckFlagsRule()
    @get:Rule val composeTestRule = createComposeRule()

    private lateinit var mockViewModel: PrivateSpaceViewModel
    private lateinit var mockOnOpenDocumentsPicker: () -> Unit
    private lateinit var mockOnFinished: () -> Unit
    private lateinit var context: Context

    @Captor val statsEventCaptor = argumentCaptor<StatsEvent>()

    private val registry = ExtensionRegistryLite.newInstance()

    private lateinit var mockitoSession: MockitoSession

    @Before
    fun setUp() {
        context = ApplicationProvider.getApplicationContext()
        mockViewModel = mock()
        mockOnOpenDocumentsPicker = mock()
        mockOnFinished = mock()

        mockitoSession = mockitoSession().mockStatic(StatsLog::class.java).startMocking()
        registry.add(PrivatespaceExtensionAtoms.privateSpaceMoveContentEvent)
    }

    @After
    fun tearDown() {
        mockitoSession.finishMocking()
    }

    @Test
    fun uiStateStarted_showsNothing() {
        setScreenContent(PrivateSpaceUiState.STARTED)
        // Check that known text from dialogs does NOT exist.
        composeTestRule
            .onNodeWithText(context.getString(R.string.move_files_dialog_title))
            .assertDoesNotExist()
        composeTestRule
            .onNodeWithText(context.getString(R.string.filetransfer_error_dialog_button))
            .assertDoesNotExist()
    }

    @Test
    fun uiStateCheckingTransferStatus_showsCircularProgressIndicator() {
        setScreenContent(PrivateSpaceUiState.CHECKING_PROGRESS_INDICATOR)

        composeTestRule
            .onNodeWithTag(testTag = CIRCULAR_PROGRESS_INDICATOR_TEST_TAG)
            .assertIsDisplayed()
    }

    @Test
    fun uiShowDocumentPicker_callsOnOpenDocumentPicker() {
        setScreenContent(PrivateSpaceUiState.SHOW_DOCUMENT_PICKER)

        verify(mockOnOpenDocumentsPicker).invoke()
    }

    @Test
    fun uiStateShowMoveFilesDialog_displaysDialogAndButtons() {
        setScreenContent(PrivateSpaceUiState.SHOW_MOVE_FILES_DIALOG)

        composeTestRule
            .onNodeWithText(context.getString(R.string.move_files_dialog_title))
            .assertIsDisplayed()
        composeTestRule
            .onNodeWithText(context.getString(R.string.move_files_dialog_summary))
            .assertIsDisplayed()
        composeTestRule
            .onNodeWithText(context.getString(R.string.move_files_dialog_button_label_move))
            .assertIsDisplayed()
        composeTestRule
            .onNodeWithText(context.getString(R.string.move_files_dialog_button_label_copy))
            .assertIsDisplayed()
        composeTestRule
            .onNodeWithText(context.getString(R.string.move_files_dialog_button_label_cancel))
            .assertIsDisplayed()
    }

    @Test
    fun showMoveFilesDialog_clickMoveButton_callsViewModelMoveFiles() {
        setScreenContent(PrivateSpaceUiState.SHOW_MOVE_FILES_DIALOG)

        composeTestRule
            .onNodeWithText(context.getString(R.string.move_files_dialog_button_label_move))
            .performClick()

        verify(mockViewModel).moveFiles(context)
    }

    @Test
    fun showMoveFilesDialog_clickMoveButton_logsPrivateSpaceMoveContentEvent() {
        setScreenContent(PrivateSpaceUiState.SHOW_MOVE_FILES_DIALOG)

        composeTestRule
            .onNodeWithText(context.getString(R.string.move_files_dialog_button_label_move))
            .performClick()

        composeTestRule.waitForIdle()

        ExtendedMockito.verify({ StatsLog.write(statsEventCaptor.capture()) }, atLeastOnce())

        val atomList =
            statsEventCaptor.allValues
                .stream()
                .map { statsEvent -> StatsEventTestUtils.convertToAtom(statsEvent, registry) }
                .filter { e ->
                    e.hasExtension(PrivatespaceExtensionAtoms.privateSpaceMoveContentEvent)
                }
                .collect(toList())
        assertThat(atomList).hasSize(1)
        val atom = atomList[0]
        val event = atom.getExtension(PrivatespaceExtensionAtoms.privateSpaceMoveContentEvent)
        verifyEventFields(event, OperationType.OPERATION_MOVE)
    }

    @Test
    fun showMoveFilesDialog_clickCopyButton_callsViewModelCopyFiles() {
        setScreenContent(PrivateSpaceUiState.SHOW_MOVE_FILES_DIALOG)

        composeTestRule
            .onNodeWithText(context.getString(R.string.move_files_dialog_button_label_copy))
            .performClick()

        verify(mockViewModel).copyFiles(context)
    }

    @Test
    fun showMoveFilesDialog_clickCopyButton_logsPrivateSpaceMoveContentEvent() {
        setScreenContent(PrivateSpaceUiState.SHOW_MOVE_FILES_DIALOG)

        composeTestRule
            .onNodeWithText(context.getString(R.string.move_files_dialog_button_label_copy))
            .performClick()

        composeTestRule.waitForIdle()

        ExtendedMockito.verify({ StatsLog.write(statsEventCaptor.capture()) }, atLeastOnce())

        val atomList =
            statsEventCaptor.allValues
                .stream()
                .map { statsEvent -> StatsEventTestUtils.convertToAtom(statsEvent, registry) }
                .filter { e ->
                    e.hasExtension(PrivatespaceExtensionAtoms.privateSpaceMoveContentEvent)
                }
                .collect(toList())
        assertThat(atomList).hasSize(1)
        val atom = atomList[0]
        val event = atom.getExtension(PrivatespaceExtensionAtoms.privateSpaceMoveContentEvent)
        verifyEventFields(event, OperationType.OPERATION_COPY)
    }

    @Test
    fun showMoveFilesDialog_clickCancelButton_callsViewModelFinishFlow() {
        setScreenContent(PrivateSpaceUiState.SHOW_MOVE_FILES_DIALOG)

        composeTestRule
            .onNodeWithText(context.getString(R.string.move_files_dialog_button_label_cancel))
            .performClick()

        verify(mockViewModel).finishFlow()
    }

    @Test
    fun showMoveFilesDialog_clickCancelButton_logsPrivateSpaceMoveContentEvent() {
        setScreenContent(PrivateSpaceUiState.SHOW_MOVE_FILES_DIALOG)

        composeTestRule
            .onNodeWithText(context.getString(R.string.move_files_dialog_button_label_cancel))
            .performClick()

        composeTestRule.waitForIdle()

        ExtendedMockito.verify({ StatsLog.write(statsEventCaptor.capture()) }, atLeastOnce())

        val atomList =
            statsEventCaptor.allValues
                .stream()
                .map { statsEvent -> StatsEventTestUtils.convertToAtom(statsEvent, registry) }
                .filter { e ->
                    e.hasExtension(PrivatespaceExtensionAtoms.privateSpaceMoveContentEvent)
                }
                .collect(toList())
        assertThat(atomList).hasSize(1)
        val atom = atomList[0]
        val event = atom.getExtension(PrivatespaceExtensionAtoms.privateSpaceMoveContentEvent)
        verifyEventFields(event, OperationType.OPERATION_CANCEL_BY_USER)
    }

    @Test
    fun uiStateShowNotEnoughSpaceDialog_displaysErrorDialog() {
        setScreenContent(PrivateSpaceUiState.SHOW_NOT_ENOUGH_SPACE_DIALOG)

        composeTestRule
            .onNodeWithText(
                context.getString(R.string.filetransfer_notification_transfer_error_title)
            )
            .assertIsDisplayed()
        composeTestRule
            .onNodeWithText(
                context.getString(
                    R.string.filetransfer_notification_insufficient_storage_error_message
                )
            )
            .assertIsDisplayed()
        composeTestRule
            .onNodeWithText(context.getString(R.string.filetransfer_error_dialog_button))
            .assertIsDisplayed()
    }

    @Test
    fun uiStateShowNotEnoughSpaceDialog_clickDismissButton_callsViewModelFinishFlow() {
        setScreenContent(PrivateSpaceUiState.SHOW_NOT_ENOUGH_SPACE_DIALOG)

        composeTestRule
            .onNodeWithText(context.getString(R.string.filetransfer_error_dialog_button))
            .performClick()
        verify(mockViewModel).finishFlow()
    }

    @Test
    fun uiStateShowAboveFileSizeLimitsDialog_displaysErrorDialog() {
        setScreenContent(PrivateSpaceUiState.SHOW_ABOVE_FILE_SIZE_LIMITS_DIALOG)

        composeTestRule
            .onNodeWithText(context.getString(R.string.filetransfer_large_files_size_error_title))
            .assertIsDisplayed()
        composeTestRule
            .onNodeWithText(context.getString(R.string.filetransfer_large_files_size_error_message))
            .assertIsDisplayed()
        composeTestRule
            .onNodeWithText(context.getString(R.string.filetransfer_error_dialog_button))
            .assertIsDisplayed()
    }

    @Test
    fun uiStateShowAboveFileSizeLimitsDialog_clickDismissButton_callsViewModelFinishFlow() {
        setScreenContent(PrivateSpaceUiState.SHOW_ABOVE_FILE_SIZE_LIMITS_DIALOG)

        composeTestRule
            .onNodeWithText(context.getString(R.string.filetransfer_error_dialog_button))
            .performClick()
        verify(mockViewModel).finishFlow()
    }

    @Test
    fun uiStateShowTooManyFilesSelectedDialog_displaysErrorDialog() {
        setScreenContent(PrivateSpaceUiState.SHOW_TOO_MANY_FILES_SELECTED_DIALOG)

        composeTestRule
            .onNodeWithText(context.getString(R.string.filetransfer_too_many_files_error_title))
            .assertIsDisplayed()
        composeTestRule
            .onNodeWithText(context.getString(R.string.filetransfer_too_many_files_error_message))
            .assertIsDisplayed()
        composeTestRule
            .onNodeWithText(context.getString(R.string.filetransfer_error_dialog_button))
            .assertIsDisplayed()
    }

    @Test
    fun uiStateShowTooManyFilesSelectedDialog_clickDismissButton_callsViewModelFinishFlow() {
        setScreenContent(PrivateSpaceUiState.SHOW_TOO_MANY_FILES_SELECTED_DIALOG)

        composeTestRule
            .onNodeWithText(context.getString(R.string.filetransfer_error_dialog_button))
            .performClick()
        verify(mockViewModel).finishFlow()
    }

    @Test
    fun uiStateShowTransferInProgressDialog_displaysCorrectTitle_whenMoving() {
        whenever(mockViewModel.isCopyOperationForErrorDialog()).thenReturn(false)

        setScreenContent(PrivateSpaceUiState.SHOW_TRANSFER_IN_PROGRESS_DIALOG)

        composeTestRule
            .onNodeWithText(
                context.getString(R.string.filetransfer_dialog_still_moving_error_title)
            )
            .assertIsDisplayed()
        composeTestRule
            .onNodeWithText(
                context.getString(R.string.filetransfer_dialog_still_transferring_error_message)
            )
            .assertIsDisplayed()
    }

    @Test
    fun uiStateShowTransferInProgressDialog_displaysCorrectTitle_whenCopying() {
        whenever(mockViewModel.isCopyOperationForErrorDialog()).thenReturn(true)

        setScreenContent(PrivateSpaceUiState.SHOW_TRANSFER_IN_PROGRESS_DIALOG)

        composeTestRule
            .onNodeWithText(
                context.getString(R.string.filetransfer_dialog_still_copying_error_title)
            )
            .assertIsDisplayed()
        composeTestRule
            .onNodeWithText(
                context.getString(R.string.filetransfer_dialog_still_transferring_error_message)
            )
            .assertIsDisplayed()
    }

    @Test
    fun uiStateShowTransferInProgressDialog_clickDismissButton_callsViewModelFinishFlow() {
        setScreenContent(PrivateSpaceUiState.SHOW_TOO_MANY_FILES_SELECTED_DIALOG)

        composeTestRule
            .onNodeWithText(context.getString(R.string.filetransfer_error_dialog_button))
            .performClick()
        verify(mockViewModel).finishFlow()
    }

    @Test
    fun uiStateFinished_callsOnFinishedLambda() {
        setScreenContent(PrivateSpaceUiState.FINISHED)
        verify(mockOnFinished).invoke()
    }

    private fun setScreenContent(uiState: PrivateSpaceUiState) {
        whenever(mockViewModel.uiState).thenReturn(uiState)

        composeTestRule.setContent {
            PrivateSpaceActivityScreen(
                viewModel = mockViewModel,
                context = context,
                onOpenDocumentsPicker = mockOnOpenDocumentsPicker,
                onFinished = mockOnFinished,
            )
        }
    }

    private fun verifyEventFields(
        event: PrivateSpaceMoveContentEvent,
        operationType: OperationType,
    ) {
        assertThat(event.operationType).isEqualTo(operationType)

        // Assert other fields are not set
        assertThat(event.transferResult).isEqualTo(TransferResult.TRANSFER_RESULT_UNKNOWN)
        assertThat(event.filesSelectedCount).isEqualTo(0)
        assertThat(event.filesSuccessCount).isEqualTo(0)
        assertThat(event.totalSuccessFilesSizeBucket).isEqualTo(FileSizeBucket.FILE_SIZE_UNKNOWN)
        assertThat(event.successFileMimeTypesList).isEmpty()

        assertThat(event.filesFailureCount).isEqualTo(0)
        assertThat(event.totalFailureFilesSizeBucket).isEqualTo(FileSizeBucket.FILE_SIZE_UNKNOWN)
        assertThat(event.failedFileErrorCodesCount).isEqualTo(0)
        assertThat(event.failedFileMimeTypesCount).isEqualTo(0)
        assertThat(event.notificationEvent)
            .isEqualTo(NotificationEventType.NOTIFICATION_EVENT_TYPE_UNKNOWN)
        assertThat(event.durationMs).isEqualTo(0)
    }
}