Data-Recover-Android/app/src/main/java/com/datarecovery/master/module/filerecover/FileRecoverViewModel.java

package com.datarecovery.master.module.filerecover;

import androidx.lifecycle.LiveData;
import androidx.lifecycle.MutableLiveData;
import androidx.lifecycle.Transformations;

import com.atmob.app.lib.base.BaseViewModel;
import com.atmob.app.lib.livedata.SingleLiveEvent;
import com.atmob.common.runtime.ContextUtil;
import com.datarecovery.master.R;
import com.datarecovery.master.utils.BoxingUtil;
import com.datarecovery.master.utils.FileUtil;
import com.datarecovery.master.utils.FilesSearch;
import com.datarecovery.master.utils.MediaStoreHelper;
import com.datarecovery.master.utils.ToastUtil;

import org.reactivestreams.Subscriber;
import org.reactivestreams.Subscription;

import java.util.ArrayList;
import java.util.List;
import java.util.concurrent.TimeUnit;

import javax.inject.Inject;

import atmob.reactivex.rxjava3.android.schedulers.AndroidSchedulers;
import atmob.reactivex.rxjava3.disposables.Disposable;
import atmob.rxjava.utils.RxJavaUtil;
import dagger.hilt.android.lifecycle.HiltViewModel;


@HiltViewModel
public class FileRecoverViewModel extends BaseViewModel {

    private final long SCANNING_COUNTDOWN = 1000 * 60 * 6;

    private final int[] tabTitle = {R.string.word, R.string.excel, R.string.ppt, R.string.pdf};

    private final List<MutableLiveData<Boolean>> checkList = new ArrayList<>();
    private final MutableLiveData<List<FilesSearch.DocumentFile>> detectedWordList = new MutableLiveData<>(new ArrayList<>());
    private final MutableLiveData<List<FilesSearch.DocumentFile>> detectedExcelList = new MutableLiveData<>(new ArrayList<>());
    private final MutableLiveData<List<FilesSearch.DocumentFile>> detectedPPTList = new MutableLiveData<>(new ArrayList<>());
    private final MutableLiveData<List<FilesSearch.DocumentFile>> detectedPDFList = new MutableLiveData<>(new ArrayList<>());
    private final MutableLiveData<List<FilesSearch.DocumentFile>> selectedList = new MutableLiveData<>(new ArrayList<>());

    private final MutableLiveData<Integer> checkPosition = new MutableLiveData<>();
    private final SingleLiveEvent<Boolean> showLoadingEvent = new SingleLiveEvent<>();
    private final SingleLiveEvent<?> detectedFinish = new SingleLiveEvent<>();
    private final SingleLiveEvent<Boolean> showScanDialogEvent = new SingleLiveEvent<>();
    private int totalCount = 0;
    private final MutableLiveData<Integer> totalDetectedCount = new MutableLiveData<>();
    private final LiveData<String> selectedCountTxt;
    private Disposable scanDisposable;

    @Inject
    public FileRecoverViewModel() {
        selectedCountTxt = Transformations.map(selectedList, list -> {
            if (list == null || list.isEmpty()) {
                return ContextUtil.getContext().getString(R.string.export);
            }
            return ContextUtil.getContext().getString(R.string.export_count, list.size());
        });
        startFileScanning();
        for (int i = 0; i < tabTitle.length; i++) checkList.add(new MutableLiveData<>(false));
    }

    public LiveData<Integer> getCheckPosition() {
        return checkPosition;
    }

    public int[] getTabTitle() {
        return tabTitle;
    }

    public LiveData<List<FilesSearch.DocumentFile>> getDetectedWordList() {
        return detectedWordList;
    }

    public LiveData<List<FilesSearch.DocumentFile>> getDetectedExcelList() {
        return detectedExcelList;
    }

    public LiveData<List<FilesSearch.DocumentFile>> getDetectedPPTList() {
        return detectedPPTList;
    }

    public LiveData<List<FilesSearch.DocumentFile>> getDetectedPDFList() {
        return detectedPDFList;
    }


    public LiveData<Boolean> getShowLoadingEvent() {
        return showLoadingEvent;
    }

    public LiveData<?> getDetectedFinish() {
        return detectedFinish;
    }

    public LiveData<Integer> getTotalDetectedCount() {
        return totalDetectedCount;
    }

    public LiveData<List<FilesSearch.DocumentFile>> getSelectedList() {
        return selectedList;
    }

    public LiveData<String> getSelectedCountTxt() {
        return selectedCountTxt;
    }


    public LiveData<Boolean> getShowScanDialogEvent() {
        return showScanDialogEvent;
    }


    public void setCheckPosition(int position) {
        this.checkPosition.setValue(position);
    }

    private void startFileScanning() {
        FilesSearch.search(ContextUtil.getContext(), FilesSearch.DocumentFile.WORD, FilesSearch.DocumentFile.EXCEL, FilesSearch.DocumentFile.PPT, FilesSearch.DocumentFile.PDF)
                .take(SCANNING_COUNTDOWN, TimeUnit.MILLISECONDS)
                .observeOn(AndroidSchedulers.mainThread())
                .subscribe(new Subscriber<List<FilesSearch.DocumentFile>>() {
                    @Override
                    public void onSubscribe(Subscription s) {
                        s.request(Integer.MAX_VALUE);
                        scanDisposable = Disposable.fromSubscription(s);
                        addDisposable(scanDisposable);
                        showScanDialogEvent.setValue(true);
                        totalCount = 0;
                        totalDetectedCount.setValue(0);
                    }

                    @Override
                    public void onNext(List<FilesSearch.DocumentFile> documentFiles) {
                        if (documentFiles == null || documentFiles.isEmpty()) {
                            return;
                        }
                        totalCount += documentFiles.size();
                        totalDetectedCount.setValue(totalCount);
                        for (FilesSearch.DocumentFile item : documentFiles) {
                            MutableLiveData<List<FilesSearch.DocumentFile>> liveData = null;
                            if (item.getCategory() == FilesSearch.DocumentFile.WORD) {
                                liveData = detectedWordList;
                            } else if (item.getCategory() == FilesSearch.DocumentFile.EXCEL) {
                                liveData = detectedExcelList;
                            } else if (item.getCategory() == FilesSearch.DocumentFile.PPT) {
                                liveData = detectedPPTList;
                            } else if (item.getCategory() == FilesSearch.DocumentFile.PDF) {
                                liveData = detectedPDFList;
                            }
                            if (liveData == null) {
                                continue;
                            }
                            List<FilesSearch.DocumentFile> list = getList(liveData);
                            list.add(0, item);
                            liveData.setValue(list);
                        }
                    }

                    @Override
                    public void onError(Throwable t) {
                        showScanDialogEvent.setValue(false);
                    }

                    @Override
                    public void onComplete() {
                        detectedFinish.call();
                    }
                });
    }

    public void cancelScan() {
        if (scanDisposable != null) scanDisposable.dispose();
    }


    private List<FilesSearch.DocumentFile> getList(LiveData<List<FilesSearch.DocumentFile>> liveData) {
        List<FilesSearch.DocumentFile> selectList = liveData.getValue();
        if (selectList == null) {
            selectList = new ArrayList<>();
        }
        return selectList;
    }

    public void onCheckAllClick(boolean isCheck) {
        int index = BoxingUtil.boxing(checkPosition.getValue());
        getCheckAll(index).setValue(isCheck);
        int id = tabTitle[index];
        MutableLiveData<List<FilesSearch.DocumentFile>> liveData = null;
        if (id == R.string.word) {
            liveData = detectedWordList;
        } else if (id == R.string.excel) {
            liveData = detectedExcelList;
        } else if (id == R.string.ppt) {
            liveData = detectedPPTList;
        } else if (id == R.string.pdf) {
            liveData = detectedPDFList;
        }
        if (liveData == null) {
            return;
        }
        List<FilesSearch.DocumentFile> list = getList(liveData);
        if (list.isEmpty()) {
            return;
        }
        List<FilesSearch.DocumentFile> selectedList = getList(this.selectedList);
        for (FilesSearch.DocumentFile item : list) {
            if (item.isCheck() != isCheck) {
                if (isCheck) {
                    selectedList.add(item);
                } else {
                    selectedList.remove(item);
                }
            }
            item.setCheck(isCheck);
        }
        this.selectedList.setValue(selectedList);
    }

    public MutableLiveData<Boolean> getCheckAll(int position) {
        return checkList.get(position);
    }

    public void onExportClick() {
        List<FilesSearch.DocumentFile> list = selectedList.getValue();
        if (list == null || list.size() == 0) {
            return;
        }
        //TODO 判断是否有会员
        showLoadingEvent.setValue(true);
        RxJavaUtil.doInBackground(() -> {
            for (FilesSearch.DocumentFile item : list) {
                MediaStoreHelper.saveToSharedStorage(MediaStoreHelper.TYPE_FILES, item.newInputStream(), FileUtil.getCreateFileName(item.getName(), ""));
                item.setCheck(false);
            }
            return true;
        }, o -> {
            getCheckAll(BoxingUtil.boxing(checkPosition.getValue())).setValue(false);
            showLoadingEvent.setValue(false);
            ToastUtil.show(R.string.export_success, ToastUtil.LENGTH_SHORT);
            list.clear();
            selectedList.setValue(list);
        }, throwable -> {
            showLoadingEvent.setValue(false);
            ToastUtil.show(R.string.export_fail, ToastUtil.LENGTH_SHORT);
        });
    }

    public void itemClick(FilesSearch.DocumentFile documentFile) {
        if (documentFile == null) {
            return;
        }
        documentFile.setCheck(!documentFile.isCheck());
        List<FilesSearch.DocumentFile> list = getList(selectedList);
        if (documentFile.isCheck()) {
            list.add(documentFile);
        } else {
            list.remove(documentFile);
        }
        this.selectedList.setValue(list);
    }
}