/*
 * Copyright (C) 2017 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.documentsui.testing;

import android.annotation.NonNull;
import android.annotation.Nullable;
import android.content.Context;
import android.content.pm.ProviderInfo;
import android.database.Cursor;
import android.database.MatrixCursor;
import android.net.Uri;
import android.os.Bundle;
import android.os.CancellationSignal;
import android.os.ParcelFileDescriptor;
import android.provider.DocumentsContract;
import android.provider.DocumentsContract.Document;
import android.provider.DocumentsProvider;

import com.android.documentsui.base.DocumentInfo;

import java.io.FileNotFoundException;

/**
 * Test doubles of {@link DocumentsProvider} to isolate document providers. This is not registered
 * or exposed through AndroidManifest, but only used locally.
 */
public class TestDocumentsProvider extends DocumentsProvider {

    private String[] DOCUMENTS_PROJECTION = new String[] {
            Document.COLUMN_DOCUMENT_ID,
            Document.COLUMN_MIME_TYPE,
            Document.COLUMN_DISPLAY_NAME,
            Document.COLUMN_LAST_MODIFIED,
            Document.COLUMN_FLAGS,
            Document.COLUMN_SUMMARY,
            Document.COLUMN_SIZE,
            Document.COLUMN_ICON
    };

    private Cursor mNextChildDocuments;
    private Cursor mNextRecentDocuments;

    public TestDocumentsProvider(Context context, String authority) {
        ProviderInfo info = new ProviderInfo();
        info.authority = authority;
        attachInfoForTesting(context, info);
    }

    @Override
    public boolean refresh(Uri url, Bundle args, CancellationSignal signal) {
        return true;
    }

    @Override
    public Cursor queryRoots(String[] projection) throws FileNotFoundException {
        return null;
    }

    @Override
    public Cursor queryDocument(String documentId, String[] projection)
            throws FileNotFoundException {
        return null;
    }

    @Override
    public Cursor queryChildDocuments(String parentDocumentId, String[] projection,
            String sortOrder) throws FileNotFoundException {
        return mNextChildDocuments;
    }

    @Override
    public ParcelFileDescriptor openDocument(String documentId, String mode,
            CancellationSignal signal) throws FileNotFoundException {
        return null;
    }

    @Override
    public Cursor queryRecentDocuments(String rootId, String[] projection) {
        return mNextRecentDocuments;
    }

    private String getStringColumn(Cursor cursor, String name) {
        return cursor.getString(cursor.getColumnIndexOrThrow(name));
    }

    private long getLongColumn(Cursor cursor, String name) {
        return cursor.getLong(cursor.getColumnIndexOrThrow(name));
    }

    @Override
    public Cursor querySearchDocuments(@NonNull String rootId, @Nullable String[] projection,
            @NonNull Bundle queryArgs) {
        TestCursor cursor = new TestCursor(DOCUMENTS_PROJECTION);
        if (mNextChildDocuments == null) {
            return cursor;
        }
        for (boolean hasNext = mNextChildDocuments.moveToFirst(); hasNext;
                hasNext = mNextChildDocuments.moveToNext()) {
            String displayName = getStringColumn(mNextChildDocuments, Document.COLUMN_DISPLAY_NAME);
            String mimeType = getStringColumn(mNextChildDocuments, Document.COLUMN_MIME_TYPE);
            long lastModified = getLongColumn(mNextChildDocuments, Document.COLUMN_LAST_MODIFIED);
            long size = getLongColumn(mNextChildDocuments, Document.COLUMN_SIZE);

            if (DocumentsContract.matchSearchQueryArguments(queryArgs, displayName, mimeType,
                    lastModified, size)) {
                cursor.newRow()
                        .add(Document.COLUMN_DOCUMENT_ID,
                                getStringColumn(mNextChildDocuments, Document.COLUMN_DOCUMENT_ID))
                        .add(Document.COLUMN_MIME_TYPE,
                                getStringColumn(mNextChildDocuments, Document.COLUMN_MIME_TYPE))
                        .add(Document.COLUMN_DISPLAY_NAME,
                                getStringColumn(mNextChildDocuments, Document.COLUMN_DISPLAY_NAME))
                        .add(Document.COLUMN_LAST_MODIFIED,
                                getLongColumn(mNextChildDocuments, Document.COLUMN_LAST_MODIFIED))
                        .add(Document.COLUMN_FLAGS,
                                getLongColumn(mNextChildDocuments, Document.COLUMN_FLAGS))
                        .add(Document.COLUMN_SUMMARY,
                                getStringColumn(mNextChildDocuments, Document.COLUMN_SUMMARY))
                        .add(Document.COLUMN_SIZE,
                                getLongColumn(mNextChildDocuments, Document.COLUMN_SIZE))
                        .add(Document.COLUMN_ICON,
                                getLongColumn(mNextChildDocuments, Document.COLUMN_ICON));
            }
        }
        return cursor;
    }

    @Override
    public Cursor querySearchDocuments(String rootId, String query, String[] projection) {
        if (mNextChildDocuments == null) {
            return null;
        }

        return filterCursorByString(mNextChildDocuments, query);
    }

    @Override
    public boolean onCreate() {
        return true;
    }

    /**
     * Sets the next return value for {@link #queryChildDocuments(String, String[], String)}.
     * @param docs docs to return for next query.
     */
    public void setNextChildDocumentsReturns(DocumentInfo... docs) {
        mNextChildDocuments = createDocumentsCursor(docs);
    }

    public void setNextRecentDocumentsReturns(DocumentInfo... docs) {
        mNextRecentDocuments = createDocumentsCursor(docs);
    }

    private Cursor createDocumentsCursor(DocumentInfo... docs) {
        TestCursor cursor = new TestCursor(DOCUMENTS_PROJECTION);
        for (DocumentInfo doc : docs) {
            cursor.newRow()
                    .add(Document.COLUMN_DOCUMENT_ID, doc.documentId)
                    .add(Document.COLUMN_MIME_TYPE, doc.mimeType)
                    .add(Document.COLUMN_DISPLAY_NAME, doc.displayName)
                    .add(Document.COLUMN_LAST_MODIFIED, doc.lastModified)
                    .add(Document.COLUMN_FLAGS, doc.flags)
                    .add(Document.COLUMN_SUMMARY, doc.summary)
                    .add(Document.COLUMN_SIZE, doc.size)
                    .add(Document.COLUMN_ICON, doc.icon);
        }

        return cursor;
    }

    private static Cursor filterCursorByString(@NonNull Cursor cursor, String query) {
        final int count = cursor.getCount();
        final String[] columnNames = cursor.getColumnNames();

        final MatrixCursor resultCursor = new MatrixCursor(columnNames, count);
        cursor.moveToPosition(-1);
        for (int i = 0; i < count; i++) {
            cursor.moveToNext();
            final int index = cursor.getColumnIndex(Document.COLUMN_DISPLAY_NAME);
            if (!cursor.getString(index).contains(query)) {
                continue;
            }

            final MatrixCursor.RowBuilder builder = resultCursor.newRow();
            final int columnCount = cursor.getColumnCount();
            for (int j = 0; j < columnCount; j++) {
                final int type = cursor.getType(j);
                switch (type) {
                    case Cursor.FIELD_TYPE_INTEGER:
                        builder.add(cursor.getLong(j));
                        break;

                    case Cursor.FIELD_TYPE_STRING:
                        builder.add(cursor.getString(j));
                        break;

                    default:
                        break;
                }
            }
        }
        cursor.moveToPosition(-1);
        return resultCursor;
    }
}