/*
 Copyright 2013 Sebastián Katzer

 Licensed to the Apache Software Foundation (ASF) under one
 or more contributor license agreements.  See the NOTICE file
 distributed with this work for additional information
 regarding copyright ownership.  The ASF licenses this file
 to you 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 de.appplant.cordova.plugin.printer;

import android.content.Context;
import android.content.res.AssetManager;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.util.Base64;

import java.io.ByteArrayInputStream;
import java.io.Closeable;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

/**
 * Provides IO utility functions to deal with the resources.
 */
class PrintIO
{
    // Application context
    private final @NonNull Context context;

    /**
     * Initializes the asset utils.
     *
     * @param ctx The application context.
     */
    PrintIO (@NonNull Context ctx)
    {
        context = ctx;
    }

    /**
     * Copies content of input stream to output stream.
     *
     * @param input  The readable input stream.
     * @param output The writable output stream.
     *
     * @throws IOException If the input stream is not readable,
     *                     or the output stream is not writable.
     */
    static void copy (@NonNull InputStream input,
                      @NonNull OutputStream output) throws IOException
    {
        byte[] buf = new byte[input.available()];
        int bytesRead;

        input.mark(Integer.MAX_VALUE);

        while ((bytesRead = input.read(buf)) > 0)
        {
            output.write(buf, 0, bytesRead);
        }

        input.reset();
        close(output);
    }

    /**
     * Closes the stream.
     *
     * @param stream The stream to close.
     */
    static void close (@NonNull Closeable stream)
    {
        try {
            stream.close();
        } catch (IOException e) {
            // ignore
        }
    }

    /**
     * Opens an file given as a file:/// path.
     *
     * @param path The path to the file.
     *
     * @return An open IO stream or null if the file does not exist.
     */
    @Nullable
    InputStream openFile (@NonNull String path)
    {
        String absPath = path.substring(7);

        try {
            return new FileInputStream(absPath);
        } catch (FileNotFoundException e) {
            return null;
        }
    }

    /**
     * Decodes an file given as a file:/// path to a bitmap.
     *
     * @param path The path to the file.
     *
     * @return A bitmap or null if the path is not valid
     */
    @Nullable
    Bitmap decodeFile (@NonNull String path)
    {
        String absPath = path.substring(7);

        return BitmapFactory.decodeFile(absPath);
    }

    /**
     * Opens an asset file given as a file:// path.
     *
     * @param path The path to the asset.
     *
     * @return An open IO stream or null if the file does not exist.
     */
    @Nullable
    InputStream openAsset (@NonNull String path)
    {
        String resPath = path.replaceFirst("file:/", "www");

        try {
            return getAssets().open(resPath);
        } catch (Exception e) {
            return null;
        }
    }

    /**
     * Decodes an asset file given as a file:// path to a bitmap.
     *
     * @param path The path to the asset.
     *
     * @return A bitmap or null if the path is not valid
     */
    @Nullable
    Bitmap decodeAsset (@NonNull String path)
    {
        InputStream stream  = openAsset(path);
        Bitmap bitmap;

        if (stream == null) return null;

        bitmap = BitmapFactory.decodeStream(stream);

        close(stream);

        return bitmap;
    }

    /**
     * Opens a resource file given as a res:// path.
     *
     * @param path The path to the resource.
     *
     * @return An open IO stream or null if the file does not exist.
     */
    @NonNull
    InputStream openResource (@NonNull String path)
    {
        String resPath = path.substring(6);
        int resId      = getResId(resPath);

        return getResources().openRawResource(resId);
    }

    /**
     * Decodes a resource given as a res:// path to a bitmap.
     *
     * @param path The path to the resource.
     *
     * @return A bitmap or null if the path is not valid
     */
    @Nullable
    Bitmap decodeResource (@NonNull String path)
    {
        String data  = path.substring(9);
        byte[] bytes = Base64.decode(data, 0);

        return BitmapFactory.decodeByteArray(bytes, 0, bytes.length);
    }

    /**
     * Opens a resource file given as a res:// path.
     *
     * @param path The path to the resource.
     *
     * @return An open IO stream or null if the file does not exist.
     */
    @NonNull
    InputStream openBase64 (@NonNull String path)
    {
        String data  = path.substring(9);
        byte[] bytes = Base64.decode(data, 0);

        return new ByteArrayInputStream(bytes);
    }

    /**
     * Decodes a resource given as a base64:// string to a bitmap.
     *
     * @param path The given relative path.
     *
     * @return A bitmap or null if the path is not valid
     */
    @Nullable
    Bitmap decodeBase64 (@NonNull String path)
    {
        String data  = path.substring(9);
        byte[] bytes = Base64.decode(data, 0);

        return BitmapFactory.decodeByteArray(bytes, 0, bytes.length);
    }

    /**
     * Returns the resource ID for the given resource path.
     *
     * @return The resource ID for the given resource.
     */
    private int getResId (@NonNull String resPath)
    {
        Resources res   = getResources();
        String pkgName  = context.getPackageName();
        String dirName  = "drawable";
        String fileName = resPath;

        if (resPath.contains("/"))
        {
            dirName  = resPath.substring(0, resPath.lastIndexOf('/'));
            fileName = resPath.substring(resPath.lastIndexOf('/') + 1);
        }

        String resName = fileName.substring(0, fileName.lastIndexOf('.'));
        int resId      = res.getIdentifier(resName, dirName, pkgName);

        if (resId == 0)
        {
            resId = res.getIdentifier(resName, "mipmap", pkgName);
        }

        if (resId == 0)
        {
            resId = res.getIdentifier(resName, "drawable", pkgName);
        }

        return resId;
    }

    /**
     * Returns the asset manager for the app.
     */
    private AssetManager getAssets()
    {
        return context.getAssets();
    }

    /**
     * Returns the resource bundle for the app.
     */
    private Resources getResources()
    {
        return context.getResources();
    }
}