/*
 * Copyright (C) 2008 ZXing authors
 *
 * 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.google.zxing.client.android.camera.open;

import android.content.Context;
import android.graphics.Point;
import android.hardware.Camera;
import android.util.Log;
import android.view.SurfaceHolder;

import com.google.zxing.PlanarYUVLuminanceSource;

import java.io.IOException;

/**
 * This object wraps the Camera service object and expects to be the only one talking to it. The
 * implementation encapsulates the steps needed to take preview-sized images, which are used for
 * both preview and decoding.
 *
 * @author [email protected] (Daniel Switkin)
 */
public final class CameraManager {

    private static final String TAG = CameraManager.class.getSimpleName();

    // private static final int MIN_FRAME_WIDTH = 240;
    // private static final int MIN_FRAME_HEIGHT = 240;
    // private static final int MAX_FRAME_WIDTH = 600;
    // private static final int MAX_FRAME_HEIGHT = 400;

    private final Context context;
    private final CameraConfigurationManager configManager;
    private Camera camera;
    private AutoFocusManager autoFocusManager;
    private boolean initialized;
    private boolean previewing;


    // PreviewCallback references are also removed from original ZXING authors work, since We're using our own interface
    // FramingRects references are also removed from original ZXING authors work, since We're using all view size while detecting QR-Codes

    public CameraManager(Context context) {
        this.context = context;
        this.configManager = new CameraConfigurationManager(context);
    }

    public Camera getCamera() {
        return camera;
    }

    public Point getPreviewSize() {
        return configManager.getCameraResolution();
    }

    /**
     * Opens the camera driver and initializes the hardware parameters.
     *
     * @param holder The surface object which the camera will draw preview frames into.
     * @throws IOException Indicates the camera driver failed to open.
     */
    public synchronized void openDriver(SurfaceHolder holder, int viewWidth, int viewHeight) throws IOException {
        Camera theCamera = camera;
        if (theCamera == null) {
            theCamera = new OpenCameraManager().build().open();
            if (theCamera == null) {
                throw new IOException();
            }
            camera = theCamera;
        }
        theCamera.setPreviewDisplay(holder);

        if (!initialized) {
            initialized = true;
            configManager.initFromCameraParameters(theCamera, viewWidth, viewHeight);
        }

        Camera.Parameters parameters = theCamera.getParameters();
        String parametersFlattened = parameters == null ? null : parameters.flatten(); // Save these, temporarily
        try {
            configManager.setDesiredCameraParameters(theCamera, false);
        } catch (RuntimeException re) {
            // Driver failed
            Log.w(TAG, "Camera rejected parameters. Setting only minimal safe-mode parameters");
            Log.i(TAG, "Resetting to saved camera params: " + parametersFlattened);
            // Reset:
            if (parametersFlattened != null) {
                parameters = theCamera.getParameters();
                parameters.unflatten(parametersFlattened);
                try {
                    theCamera.setParameters(parameters);
                    configManager.setDesiredCameraParameters(theCamera, true);
                } catch (RuntimeException re2) {
                    // Well, darn. Give up
                    Log.w(TAG, "Camera rejected even safe-mode parameters! No configuration");
                }
            }
        }

    }

    public synchronized boolean isOpen() {
        return camera != null;
    }

    /**
     * Closes the camera driver if still in use.
     */
    public synchronized void closeDriver() {
        if (camera != null) {
            camera.release();
            camera = null;
            // Make sure to clear these each time we close the camera, so that any scanning rect
            // requested by intent is forgotten.
            // framingRect = null;
            // framingRectInPreview = null;
        }
    }

    /**
     * Asks the camera hardware to begin drawing preview frames to the screen.
     */
    public synchronized void startPreview() {
        Camera theCamera = camera;
        if (theCamera != null && !previewing) {
            theCamera.startPreview();
            previewing = true;
            autoFocusManager = new AutoFocusManager(context, camera);
        }
    }

    /**
     * Tells the camera to stop drawing preview frames.
     */
    public synchronized void stopPreview() {
        if (autoFocusManager != null) {
            autoFocusManager.stop();
            autoFocusManager = null;
        }
        if (camera != null && previewing) {
            camera.stopPreview();
            //previewCallback.setHandler(null, 0);
            previewing = false;
        }
    }


    // All references to Torch are removed from original ZXING authors work since we're not using them.

    // All references to FramingRects are removed from original ZXING authors work since we're not using them.

    /**
     * A factory method to build the appropriate LuminanceSource object based on the format
     * of the preview buffers, as described by Camera.Parameters.
     *
     * @param data   A preview frame.
     * @param width  The width of the image.
     * @param height The height of the image.
     * @return A PlanarYUVLuminanceSource instance.
     */
    public PlanarYUVLuminanceSource buildLuminanceSource(byte[] data, int width, int height) {

        return new PlanarYUVLuminanceSource(data, width, height, 0, 0, width, height, false); // Search QR in all image along, not only in Framing Rect as original code done

    }

}