/*
 * Copyright (C) 2012 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 android.view;

import android.animation.ValueAnimator;
import android.app.ActivityManager;
import android.content.ComponentCallbacks2;
import android.content.res.Configuration;
import android.opengl.ManagedEGLContext;
import android.os.IBinder;
import android.os.Looper;
import android.os.RemoteException;
import android.os.ServiceManager;
import android.os.SystemProperties;
import android.util.AndroidRuntimeException;
import android.util.Log;
import android.view.inputmethod.InputMethodManager;

import java.io.FileDescriptor;
import java.io.FileOutputStream;
import java.io.PrintWriter;

/**
 * Provides low-level communication with the system window manager for
 * operations that are not associated with any particular context.
 *
 * This class is only used internally to implement global functions where
 * the caller already knows the display and relevant compatibility information
 * for the operation.  For most purposes, you should use {@link WindowManager} instead
 * since it is bound to a context.
 *
 * @see WindowManagerImpl
 * @hide
 */
public final class WindowManagerGlobal {
    private static final String TAG = "WindowManager";

    /**
     * The user is navigating with keys (not the touch screen), so
     * navigational focus should be shown.
     */
    public static final int RELAYOUT_RES_IN_TOUCH_MODE = 0x1;

    /**
     * This is the first time the window is being drawn,
     * so the client must call drawingFinished() when done
     */
    public static final int RELAYOUT_RES_FIRST_TIME = 0x2;

    /**
     * The window manager has changed the surface from the last call.
     */
    public static final int RELAYOUT_RES_SURFACE_CHANGED = 0x4;

    /**
     * The window manager is currently animating.  It will call
     * IWindow.doneAnimating() when done.
     */
    public static final int RELAYOUT_RES_ANIMATING = 0x8;

    /**
     * Flag for relayout: the client will be later giving
     * internal insets; as a result, the window will not impact other window
     * layouts until the insets are given.
     */
    public static final int RELAYOUT_INSETS_PENDING = 0x1;

    /**
     * Flag for relayout: the client may be currently using the current surface,
     * so if it is to be destroyed as a part of the relayout the destroy must
     * be deferred until later.  The client will call performDeferredDestroy()
     * when it is okay.
     */
    public static final int RELAYOUT_DEFER_SURFACE_DESTROY = 0x2;

    public static final int ADD_FLAG_APP_VISIBLE = 0x2;
    public static final int ADD_FLAG_IN_TOUCH_MODE = RELAYOUT_RES_IN_TOUCH_MODE;

    public static final int ADD_OKAY = 0;
    public static final int ADD_BAD_APP_TOKEN = -1;
    public static final int ADD_BAD_SUBWINDOW_TOKEN = -2;
    public static final int ADD_NOT_APP_TOKEN = -3;
    public static final int ADD_APP_EXITING = -4;
    public static final int ADD_DUPLICATE_ADD = -5;
    public static final int ADD_STARTING_NOT_NEEDED = -6;
    public static final int ADD_MULTIPLE_SINGLETON = -7;
    public static final int ADD_PERMISSION_DENIED = -8;
    public static final int ADD_INVALID_DISPLAY = -9;

    private static WindowManagerGlobal sDefaultWindowManager;
    private static IWindowManager sWindowManagerService;
    private static IWindowSession sWindowSession;

    private final Object mLock = new Object();

    private View[] mViews;
    private ViewRootImpl[] mRoots;
    private WindowManager.LayoutParams[] mParams;
    private boolean mNeedsEglTerminate;

    private Runnable mSystemPropertyUpdater;

    private WindowManagerGlobal() {
    }

    public static WindowManagerGlobal getInstance() {
        synchronized (WindowManagerGlobal.class) {
            if (sDefaultWindowManager == null) {
                sDefaultWindowManager = new WindowManagerGlobal();
            }
            return sDefaultWindowManager;
        }
    }

    public static IWindowManager getWindowManagerService() {
        synchronized (WindowManagerGlobal.class) {
            if (sWindowManagerService == null) {
                sWindowManagerService = IWindowManager.Stub.asInterface(
                        ServiceManager.getService("window"));
            }
            return sWindowManagerService;
        }
    }

    public static IWindowSession getWindowSession(Looper mainLooper) {
        synchronized (WindowManagerGlobal.class) {
            if (sWindowSession == null) {
                try {
                    InputMethodManager imm = InputMethodManager.getInstance(mainLooper);
                    IWindowManager windowManager = getWindowManagerService();
                    sWindowSession = windowManager.openSession(
                            imm.getClient(), imm.getInputContext());
                    float animatorScale = windowManager.getAnimationScale(2);
                    ValueAnimator.setDurationScale(animatorScale);
                } catch (RemoteException e) {
                    Log.e(TAG, "Failed to open window session", e);
                }
            }
            return sWindowSession;
        }
    }

    public static IWindowSession peekWindowSession() {
        synchronized (WindowManagerGlobal.class) {
            return sWindowSession;
        }
    }

    public void addView(View view, ViewGroup.LayoutParams params,
            Display display, Window parentWindow) {
        if (view == null) {
            throw new IllegalArgumentException("view must not be null");
        }
        if (display == null) {
            throw new IllegalArgumentException("display must not be null");
        }
        if (!(params instanceof WindowManager.LayoutParams)) {
            throw new IllegalArgumentException("Params must be WindowManager.LayoutParams");
        }

        final WindowManager.LayoutParams wparams = (WindowManager.LayoutParams)params;
        if (parentWindow != null) {
            parentWindow.adjustLayoutParamsForSubWindow(wparams);
        }

        ViewRootImpl root;
        View panelParentView = null;

        synchronized (mLock) {
            // Start watching for system property changes.
            if (mSystemPropertyUpdater == null) {
                mSystemPropertyUpdater = new Runnable() {
                    @Override public void run() {
                        synchronized (mLock) {
                            for (ViewRootImpl viewRoot : mRoots) {
                                viewRoot.loadSystemProperties();
                            }
                        }
                    }
                };
                SystemProperties.addChangeCallback(mSystemPropertyUpdater);
            }

            int index = findViewLocked(view, false);
            if (index >= 0) {
                throw new IllegalStateException("View " + view
                        + " has already been added to the window manager.");
            }

            // If this is a panel window, then find the window it is being
            // attached to for future reference.
            if (wparams.type >= WindowManager.LayoutParams.FIRST_SUB_WINDOW &&
                    wparams.type <= WindowManager.LayoutParams.LAST_SUB_WINDOW) {
                final int count = mViews != null ? mViews.length : 0;
                for (int i=0; i<count; i++) {
                    if (mRoots[i].mWindow.asBinder() == wparams.token) {
                        panelParentView = mViews[i];
                    }
                }
            }

            root = new ViewRootImpl(view.getContext(), display);

            view.setLayoutParams(wparams);

            if (mViews == null) {
                index = 1;
                mViews = new View[1];
                mRoots = new ViewRootImpl[1];
                mParams = new WindowManager.LayoutParams[1];
            } else {
                index = mViews.length + 1;
                Object[] old = mViews;
                mViews = new View[index];
                System.arraycopy(old, 0, mViews, 0, index-1);
                old = mRoots;
                mRoots = new ViewRootImpl[index];
                System.arraycopy(old, 0, mRoots, 0, index-1);
                old = mParams;
                mParams = new WindowManager.LayoutParams[index];
                System.arraycopy(old, 0, mParams, 0, index-1);
            }
            index--;

            mViews[index] = view;
            mRoots[index] = root;
            mParams[index] = wparams;
        }

        // do this last because it fires off messages to start doing things
        try {
            root.setView(view, wparams, panelParentView);
        } catch (RuntimeException e) {
            // BadTokenException or InvalidDisplayException, clean up.
            synchronized (mLock) {
                final int index = findViewLocked(view, false);
                if (index >= 0) {
                    removeViewLocked(index, true);
                }
            }
            throw e;
        }
    }

    public void updateViewLayout(View view, ViewGroup.LayoutParams params) {
        if (view == null) {
            throw new IllegalArgumentException("view must not be null");
        }
        if (!(params instanceof WindowManager.LayoutParams)) {
            throw new IllegalArgumentException("Params must be WindowManager.LayoutParams");
        }

        final WindowManager.LayoutParams wparams = (WindowManager.LayoutParams)params;

        view.setLayoutParams(wparams);

        synchronized (mLock) {
            int index = findViewLocked(view, true);
            ViewRootImpl root = mRoots[index];
            mParams[index] = wparams;
            root.setLayoutParams(wparams, false);
        }
    }

    public void removeView(View view, boolean immediate) {
        if (view == null) {
            throw new IllegalArgumentException("view must not be null");
        }

        synchronized (mLock) {
            int index = findViewLocked(view, true);
            View curView = removeViewLocked(index, immediate);
            if (curView == view) {
                return;
            }

            throw new IllegalStateException("Calling with view " + view
                    + " but the ViewAncestor is attached to " + curView);
        }
    }

    public void closeAll(IBinder token, String who, String what) {
        synchronized (mLock) {
            if (mViews == null)
                return;

            int count = mViews.length;
            //Log.i("foo", "Closing all windows of " + token);
            for (int i=0; i<count; i++) {
                //Log.i("foo", "@ " + i + " token " + mParams[i].token
                //        + " view " + mRoots[i].getView());
                if (token == null || mParams[i].token == token) {
                    ViewRootImpl root = mRoots[i];

                    //Log.i("foo", "Force closing " + root);
                    if (who != null) {
                        WindowLeaked leak = new WindowLeaked(
                                what + " " + who + " has leaked window "
                                + root.getView() + " that was originally added here");
                        leak.setStackTrace(root.getLocation().getStackTrace());
                        Log.e(TAG, leak.getMessage(), leak);
                    }

                    removeViewLocked(i, false);
                    i--;
                    count--;
                }
            }
        }
    }

    private View removeViewLocked(int index, boolean immediate) {
        ViewRootImpl root = mRoots[index];
        View view = root.getView();

        if (view != null) {
            InputMethodManager imm = InputMethodManager.getInstance(view.getContext());
            if (imm != null) {
                imm.windowDismissed(mViews[index].getWindowToken());
            }
        }
        root.die(immediate);

        final int count = mViews.length;

        // remove it from the list
        View[] tmpViews = new View[count-1];
        removeItem(tmpViews, mViews, index);
        mViews = tmpViews;

        ViewRootImpl[] tmpRoots = new ViewRootImpl[count-1];
        removeItem(tmpRoots, mRoots, index);
        mRoots = tmpRoots;

        WindowManager.LayoutParams[] tmpParams
                = new WindowManager.LayoutParams[count-1];
        removeItem(tmpParams, mParams, index);
        mParams = tmpParams;

        if (view != null) {
            view.assignParent(null);
            // func doesn't allow null...  does it matter if we clear them?
            //view.setLayoutParams(null);
        }
        return view;
    }

    private static void removeItem(Object[] dst, Object[] src, int index) {
        if (dst.length > 0) {
            if (index > 0) {
                System.arraycopy(src, 0, dst, 0, index);
            }
            if (index < dst.length) {
                System.arraycopy(src, index+1, dst, index, src.length-index-1);
            }
        }
    }

    private int findViewLocked(View view, boolean required) {
        if (mViews != null) {
            final int count = mViews.length;
            for (int i = 0; i < count; i++) {
                if (mViews[i] == view) {
                    return i;
                }
            }
        }
        if (required) {
            throw new IllegalArgumentException("View not attached to window manager");
        }
        return -1;
    }

    public void startTrimMemory(int level) {
        if (HardwareRenderer.isAvailable()) {
            // On low-end gfx devices we trim when memory is moderate;
            // on high-end devices we do this when low.
            if (level >= ComponentCallbacks2.TRIM_MEMORY_COMPLETE
                    || (level >= ComponentCallbacks2.TRIM_MEMORY_MODERATE
                            && !ActivityManager.isHighEndGfx())) {
                // Destroy all hardware surfaces and resources associated to
                // known windows
                synchronized (mLock) {
                    if (mViews == null) return;
                    int count = mViews.length;
                    for (int i = 0; i < count; i++) {
                        mRoots[i].terminateHardwareResources();
                    }
                }
                // Force a full memory flush
                mNeedsEglTerminate = true;
                HardwareRenderer.startTrimMemory(ComponentCallbacks2.TRIM_MEMORY_COMPLETE);
                return;
            }

            HardwareRenderer.startTrimMemory(level);
        }
    }

    public void endTrimMemory() {
        HardwareRenderer.endTrimMemory();

        if (mNeedsEglTerminate) {
            ManagedEGLContext.doTerminate();
            mNeedsEglTerminate = false;
        }
    }

    public void trimLocalMemory() {
        synchronized (mLock) {
            if (mViews == null) return;
            int count = mViews.length;
            for (int i = 0; i < count; i++) {
                mRoots[i].destroyHardwareLayers();
            }
        }
    }

    public void dumpGfxInfo(FileDescriptor fd) {
        FileOutputStream fout = new FileOutputStream(fd);
        PrintWriter pw = new PrintWriter(fout);
        try {
            synchronized (mLock) {
                if (mViews != null) {
                    final int count = mViews.length;

                    pw.println("Profile data in ms:");

                    for (int i = 0; i < count; i++) {
                        ViewRootImpl root = mRoots[i];
                        String name = getWindowName(root);
                        pw.printf("\n\t%s", name);

                        HardwareRenderer renderer =
                                root.getView().mAttachInfo.mHardwareRenderer;
                        if (renderer != null) {
                            renderer.dumpGfxInfo(pw);
                        }
                    }

                    pw.println("\nView hierarchy:\n");

                    int viewsCount = 0;
                    int displayListsSize = 0;
                    int[] info = new int[2];

                    for (int i = 0; i < count; i++) {
                        ViewRootImpl root = mRoots[i];
                        root.dumpGfxInfo(info);

                        String name = getWindowName(root);
                        pw.printf("  %s\n  %d views, %.2f kB of display lists",
                                name, info[0], info[1] / 1024.0f);
                        HardwareRenderer renderer =
                                root.getView().mAttachInfo.mHardwareRenderer;
                        if (renderer != null) {
                            pw.printf(", %d frames rendered", renderer.getFrameCount());
                        }
                        pw.printf("\n\n");

                        viewsCount += info[0];
                        displayListsSize += info[1];
                    }

                    pw.printf("\nTotal ViewRootImpl: %d\n", count);
                    pw.printf("Total Views:        %d\n", viewsCount);
                    pw.printf("Total DisplayList:  %.2f kB\n\n", displayListsSize / 1024.0f);
                }
            }
        } finally {
            pw.flush();
        }
    }

    private static String getWindowName(ViewRootImpl root) {
        return root.mWindowAttributes.getTitle() + "/" +
                root.getClass().getName() + '@' + Integer.toHexString(root.hashCode());
    }

    public void setStoppedState(IBinder token, boolean stopped) {
        synchronized (mLock) {
            if (mViews != null) {
                int count = mViews.length;
                for (int i=0; i < count; i++) {
                    if (token == null || mParams[i].token == token) {
                        ViewRootImpl root = mRoots[i];
                        root.setStopped(stopped);
                    }
                }
            }
        }
    }

    public void reportNewConfiguration(Configuration config) {
        synchronized (mLock) {
            if (mViews != null) {
                int count = mViews.length;
                config = new Configuration(config);
                for (int i=0; i < count; i++) {
                    ViewRootImpl root = mRoots[i];
                    root.requestUpdateConfiguration(config);
                }
            }
        }
    }
}

final class WindowLeaked extends AndroidRuntimeException {
    public WindowLeaked(String msg) {
        super(msg);
    }
}