// Copyright 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

package org.chromium.content_shell_apk;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.text.TextUtils;
import android.util.Log;
import android.view.KeyEvent;
import android.widget.Toast;

import org.chromium.base.BaseSwitches;
import org.chromium.base.CommandLine;
import org.chromium.base.MemoryPressureListener;
import org.chromium.base.library_loader.LibraryLoader;
import org.chromium.base.library_loader.ProcessInitException;
import org.chromium.content.browser.BrowserStartupController;
import org.chromium.content.browser.ContentViewCore;
import org.chromium.content.browser.DeviceUtils;
import org.chromium.content.common.ContentSwitches;
import org.chromium.content_shell.Shell;
import org.chromium.content_shell.ShellManager;
import org.chromium.ui.base.ActivityWindowAndroid;
import org.chromium.ui.base.WindowAndroid;

/**
 * Activity for managing the Content Shell.
 */
public class ContentShellActivity extends Activity {

    public static final String COMMAND_LINE_FILE = "/data/local/tmp/content-shell-command-line";
    private static final String TAG = "ContentShellActivity";

    private static final String ACTIVE_SHELL_URL_KEY = "activeUrl";
    public static final String COMMAND_LINE_ARGS_KEY = "commandLineArgs";

    private ShellManager mShellManager;
    private WindowAndroid mWindowAndroid;

    @Override
    protected void onCreate(final Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        // Initializing the command line must occur before loading the library.
        if (!CommandLine.isInitialized()) {
            CommandLine.initFromFile(COMMAND_LINE_FILE);
            String[] commandLineParams = getCommandLineParamsFromIntent(getIntent());
            if (commandLineParams != null) {
                CommandLine.getInstance().appendSwitchesAndArguments(commandLineParams);
            }
        }
        waitForDebuggerIfNeeded();

        DeviceUtils.addDeviceSpecificUserAgentSwitch(this);
        try {
            LibraryLoader.ensureInitialized();
        } catch (ProcessInitException e) {
            Log.e(TAG, "ContentView initialization failed.", e);
            // Since the library failed to initialize nothing in the application
            // can work, so kill the whole application not just the activity
            System.exit(-1);
            return;
        }

        setContentView(R.layout.content_shell_activity);
        mShellManager = (ShellManager) findViewById(R.id.shell_container);
        mWindowAndroid = new ActivityWindowAndroid(this);
        mWindowAndroid.restoreInstanceState(savedInstanceState);
        mShellManager.setWindow(mWindowAndroid);

        String startupUrl = getUrlFromIntent(getIntent());
        if (!TextUtils.isEmpty(startupUrl)) {
            mShellManager.setStartupUrl(Shell.sanitizeUrl(startupUrl));
        }

        if (CommandLine.getInstance().hasSwitch(ContentSwitches.DUMP_RENDER_TREE)) {
            try {
                BrowserStartupController.get(this).startBrowserProcessesSync(
                       BrowserStartupController.MAX_RENDERERS_LIMIT);
            } catch (ProcessInitException e) {
                Log.e(TAG, "Failed to load native library.", e);
                System.exit(-1);
            }
        } else {
            try {
                BrowserStartupController.get(this).startBrowserProcessesAsync(
                        new BrowserStartupController.StartupCallback() {
                            @Override
                            public void onSuccess(boolean alreadyStarted) {
                                finishInitialization(savedInstanceState);
                            }

                            @Override
                            public void onFailure() {
                                initializationFailed();
                            }
                        });
            } catch (ProcessInitException e) {
                Log.e(TAG, "Unable to load native library.", e);
                System.exit(-1);
            }
        }
    }

    private void finishInitialization(Bundle savedInstanceState) {
        String shellUrl = ShellManager.DEFAULT_SHELL_URL;
        if (savedInstanceState != null
                && savedInstanceState.containsKey(ACTIVE_SHELL_URL_KEY)) {
            shellUrl = savedInstanceState.getString(ACTIVE_SHELL_URL_KEY);
        }
        mShellManager.launchShell(shellUrl);
    }

    private void initializationFailed() {
        Log.e(TAG, "ContentView initialization failed.");
        Toast.makeText(ContentShellActivity.this,
                R.string.browser_process_initialization_failed,
                Toast.LENGTH_SHORT).show();
        finish();
    }

    @Override
    protected void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        ContentViewCore contentViewCore = getActiveContentViewCore();
        if (contentViewCore != null) {
            outState.putString(ACTIVE_SHELL_URL_KEY, contentViewCore.getUrl());
        }

        mWindowAndroid.saveInstanceState(outState);
    }

    private void waitForDebuggerIfNeeded() {
        if (CommandLine.getInstance().hasSwitch(BaseSwitches.WAIT_FOR_JAVA_DEBUGGER)) {
            Log.e(TAG, "Waiting for Java debugger to connect...");
            android.os.Debug.waitForDebugger();
            Log.e(TAG, "Java debugger connected. Resuming execution.");
        }
    }

    @Override
    public boolean onKeyUp(int keyCode, KeyEvent event) {
        if (keyCode == KeyEvent.KEYCODE_BACK) {
            ContentViewCore contentViewCore = getActiveContentViewCore();
            if (contentViewCore != null && contentViewCore.canGoBack()) {
                contentViewCore.goBack();
                return true;
            }
        }

        return super.onKeyUp(keyCode, event);
    }

    @Override
    protected void onNewIntent(Intent intent) {
        if (getCommandLineParamsFromIntent(intent) != null) {
            Log.i(TAG, "Ignoring command line params: can only be set when creating the activity.");
        }

        if (MemoryPressureListener.handleDebugIntent(this, intent.getAction())) return;

        String url = getUrlFromIntent(intent);
        if (!TextUtils.isEmpty(url)) {
            Shell activeView = getActiveShell();
            if (activeView != null) {
                activeView.loadUrl(url);
            }
        }
    }

    @Override
    protected void onStop() {
        super.onStop();

        ContentViewCore contentViewCore = getActiveContentViewCore();
        if (contentViewCore != null) contentViewCore.onHide();
    }

    @Override
    protected void onStart() {
        super.onStart();

        ContentViewCore contentViewCore = getActiveContentViewCore();
        if (contentViewCore != null) contentViewCore.onShow();
    }

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        mWindowAndroid.onActivityResult(requestCode, resultCode, data);
    }

    private static String getUrlFromIntent(Intent intent) {
        return intent != null ? intent.getDataString() : null;
    }

    private static String[] getCommandLineParamsFromIntent(Intent intent) {
        return intent != null ? intent.getStringArrayExtra(COMMAND_LINE_ARGS_KEY) : null;
    }

    /**
     * @return The {@link ShellManager} configured for the activity or null if it has not been
     *         created yet.
     */
    public ShellManager getShellManager() {
        return mShellManager;
    }

    /**
     * @return The currently visible {@link Shell} or null if one is not showing.
     */
    public Shell getActiveShell() {
        return mShellManager != null ? mShellManager.getActiveShell() : null;
    }

    /**
     * @return The {@link ContentViewCore} owned by the currently visible {@link Shell} or null if
     *         one is not showing.
     */
    public ContentViewCore getActiveContentViewCore() {
        Shell shell = getActiveShell();
        return shell != null ? shell.getContentViewCore() : null;
    }
}