/*
 * Copyright (C) 2008 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.systemui.statusbar.phone;

import android.animation.LayoutTransition;
import android.app.ActivityManagerNative;
import android.app.StatusBarManager;
import android.app.admin.DevicePolicyManager;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.res.Resources;
import android.graphics.Point;
import android.graphics.Rect;
import android.graphics.drawable.Drawable;
import android.os.Handler;
import android.os.Message;
import android.os.RemoteException;
import android.util.AttributeSet;
import android.util.Log;
import android.view.Display;
import android.view.MotionEvent;
import android.view.Surface;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.ViewGroup;
import android.view.WindowManager;
import android.view.accessibility.AccessibilityManager;
import android.widget.ImageView;
import android.widget.LinearLayout;

import com.android.systemui.R;
import com.android.systemui.statusbar.BaseStatusBar;
import com.android.systemui.statusbar.DelegateViewHelper;
import com.android.systemui.statusbar.policy.DeadZone;

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

public class NavigationBarView extends LinearLayout {
    private static final int CAMERA_BUTTON_FADE_DURATION = 200;
    final static boolean DEBUG = false;
    final static String TAG = "PhoneStatusBar/NavigationBarView";

    final static boolean NAVBAR_ALWAYS_AT_RIGHT = true;

    // slippery nav bar when everything is disabled, e.g. during setup
    final static boolean SLIPPERY_WHEN_DISABLED = true;

    final Display mDisplay;
    View mCurrentView = null;
    View[] mRotatedViews = new View[4];

    int mBarSize;
    boolean mVertical;
    boolean mScreenOn;

    boolean mShowMenu;
    int mDisabledFlags = 0;
    int mNavigationIconHints = 0;

    private Drawable mBackIcon, mBackLandIcon, mBackAltIcon, mBackAltLandIcon;
    private Drawable mRecentIcon;
    private Drawable mRecentLandIcon;

    private DelegateViewHelper mDelegateHelper;
    private DeadZone mDeadZone;
    private final NavigationBarTransitions mBarTransitions;

    // workaround for LayoutTransitions leaving the nav buttons in a weird state (bug 5549288)
    final static boolean WORKAROUND_INVALID_LAYOUT = true;
    final static int MSG_CHECK_INVALID_LAYOUT = 8686;

    // used to disable the camera icon in navbar when disabled by DPM
    private boolean mCameraDisabledByDpm;

    private final OnTouchListener mCameraTouchListener = new OnTouchListener() {
        @Override
        public boolean onTouch(View cameraButtonView, MotionEvent event) {
            View searchLight = getSearchLight();
            switch (event.getAction()) {
                case MotionEvent.ACTION_DOWN:
                    // disable search gesture while interacting with camera
                    mDelegateHelper.setDisabled(true);
                    cameraButtonView.animate().alpha(0.0f).setDuration(CAMERA_BUTTON_FADE_DURATION);
                    if (searchLight != null) {
                        searchLight.animate().alpha(0.0f).setDuration(CAMERA_BUTTON_FADE_DURATION);
                    }
                    break;
                case MotionEvent.ACTION_UP:
                case MotionEvent.ACTION_CANCEL:
                    mDelegateHelper.setDisabled(false);
                    cameraButtonView.animate().alpha(1.0f).setDuration(CAMERA_BUTTON_FADE_DURATION);
                    if (searchLight != null) {
                        searchLight.animate().alpha(1.0f).setDuration(CAMERA_BUTTON_FADE_DURATION);
                    }
                    break;
            }
            return KeyguardTouchDelegate.getInstance(getContext()).dispatch(event);
        }
    };

    private class H extends Handler {
        public void handleMessage(Message m) {
            switch (m.what) {
                case MSG_CHECK_INVALID_LAYOUT:
                    final String how = "" + m.obj;
                    final int w = getWidth();
                    final int h = getHeight();
                    final int vw = mCurrentView.getWidth();
                    final int vh = mCurrentView.getHeight();

                    if (h != vh || w != vw) {
                        Log.w(TAG, String.format(
                            "*** Invalid layout in navigation bar (%s this=%dx%d cur=%dx%d)",
                            how, w, h, vw, vh));
                        if (WORKAROUND_INVALID_LAYOUT) {
                            requestLayout();
                        }
                    }
                    break;
            }
        }
    }

    public NavigationBarView(Context context, AttributeSet attrs) {
        super(context, attrs);

        mDisplay = ((WindowManager)context.getSystemService(
                Context.WINDOW_SERVICE)).getDefaultDisplay();

        final Resources res = mContext.getResources();
        mBarSize = res.getDimensionPixelSize(R.dimen.navigation_bar_size);
        mVertical = false;
        mShowMenu = false;
        mDelegateHelper = new DelegateViewHelper(this);

        getIcons(res);

        mBarTransitions = new NavigationBarTransitions(this);

        mCameraDisabledByDpm = isCameraDisabledByDpm();
        watchForDevicePolicyChanges();
    }

    private void watchForDevicePolicyChanges() {
        final IntentFilter filter = new IntentFilter();
        filter.addAction(DevicePolicyManager.ACTION_DEVICE_POLICY_MANAGER_STATE_CHANGED);
        mContext.registerReceiver(new BroadcastReceiver() {
            public void onReceive(Context context, Intent intent) {
                post(new Runnable() {
                    @Override
                    public void run() {
                        mCameraDisabledByDpm = isCameraDisabledByDpm();
                    }
                });
            }
        }, filter);
    }

    public BarTransitions getBarTransitions() {
        return mBarTransitions;
    }

    public void setDelegateView(View view) {
        mDelegateHelper.setDelegateView(view);
    }

    public void setBar(BaseStatusBar phoneStatusBar) {
        mDelegateHelper.setBar(phoneStatusBar);
    }

    @Override
    public boolean onTouchEvent(MotionEvent event) {
        if (mDeadZone != null && event.getAction() == MotionEvent.ACTION_OUTSIDE) {
            mDeadZone.poke(event);
        }
        if (mDelegateHelper != null) {
            boolean ret = mDelegateHelper.onInterceptTouchEvent(event);
            if (ret) return true;
        }
        return super.onTouchEvent(event);
    }

    @Override
    public boolean onInterceptTouchEvent(MotionEvent event) {
        return mDelegateHelper.onInterceptTouchEvent(event);
    }

    private H mHandler = new H();

    public View getCurrentView() {
        return mCurrentView;
    }

    public View getRecentsButton() {
        return mCurrentView.findViewById(R.id.recent_apps);
    }

    public View getMenuButton() {
        return mCurrentView.findViewById(R.id.menu);
    }

    public View getBackButton() {
        return mCurrentView.findViewById(R.id.back);
    }

    public View getHomeButton() {
        return mCurrentView.findViewById(R.id.home);
    }

    // for when home is disabled, but search isn't
    public View getSearchLight() {
        return mCurrentView.findViewById(R.id.search_light);
    }

    // shown when keyguard is visible and camera is available
    public View getCameraButton() {
        return mCurrentView.findViewById(R.id.camera_button);
    }

    private void getIcons(Resources res) {
        mBackIcon = res.getDrawable(R.drawable.ic_sysbar_back);
        mBackLandIcon = res.getDrawable(R.drawable.ic_sysbar_back_land);
        mBackAltIcon = res.getDrawable(R.drawable.ic_sysbar_back_ime);
        mBackAltLandIcon = res.getDrawable(R.drawable.ic_sysbar_back_ime);
        mRecentIcon = res.getDrawable(R.drawable.ic_sysbar_recent);
        mRecentLandIcon = res.getDrawable(R.drawable.ic_sysbar_recent_land);
    }

    @Override
    public void setLayoutDirection(int layoutDirection) {
        getIcons(mContext.getResources());

        super.setLayoutDirection(layoutDirection);
    }

    public void notifyScreenOn(boolean screenOn) {
        mScreenOn = screenOn;
        setDisabledFlags(mDisabledFlags, true);
    }

    public void setNavigationIconHints(int hints) {
        setNavigationIconHints(hints, false);
    }

    public void setNavigationIconHints(int hints, boolean force) {
        if (!force && hints == mNavigationIconHints) return;

        if (DEBUG) {
            android.widget.Toast.makeText(mContext,
                "Navigation icon hints = " + hints,
                500).show();
        }

        mNavigationIconHints = hints;

        getBackButton().setAlpha(
            (0 != (hints & StatusBarManager.NAVIGATION_HINT_BACK_NOP)) ? 0.5f : 1.0f);
        getHomeButton().setAlpha(
            (0 != (hints & StatusBarManager.NAVIGATION_HINT_HOME_NOP)) ? 0.5f : 1.0f);
        getRecentsButton().setAlpha(
            (0 != (hints & StatusBarManager.NAVIGATION_HINT_RECENT_NOP)) ? 0.5f : 1.0f);

        ((ImageView)getBackButton()).setImageDrawable(
            (0 != (hints & StatusBarManager.NAVIGATION_HINT_BACK_ALT))
                ? (mVertical ? mBackAltLandIcon : mBackAltIcon)
                : (mVertical ? mBackLandIcon : mBackIcon));

        ((ImageView)getRecentsButton()).setImageDrawable(mVertical ? mRecentLandIcon : mRecentIcon);

        setDisabledFlags(mDisabledFlags, true);
    }

    public void setDisabledFlags(int disabledFlags) {
        setDisabledFlags(disabledFlags, false);
    }

    public void setDisabledFlags(int disabledFlags, boolean force) {
        if (!force && mDisabledFlags == disabledFlags) return;

        mDisabledFlags = disabledFlags;

        final boolean disableHome = ((disabledFlags & View.STATUS_BAR_DISABLE_HOME) != 0);
        final boolean disableRecent = ((disabledFlags & View.STATUS_BAR_DISABLE_RECENT) != 0);
        final boolean disableBack = ((disabledFlags & View.STATUS_BAR_DISABLE_BACK) != 0)
                && ((mNavigationIconHints & StatusBarManager.NAVIGATION_HINT_BACK_ALT) == 0);
        final boolean disableSearch = ((disabledFlags & View.STATUS_BAR_DISABLE_SEARCH) != 0);

        if (SLIPPERY_WHEN_DISABLED) {
            setSlippery(disableHome && disableRecent && disableBack && disableSearch);
        }

        if (!mScreenOn && mCurrentView != null) {
            ViewGroup navButtons = (ViewGroup) mCurrentView.findViewById(R.id.nav_buttons);
            LayoutTransition lt = navButtons == null ? null : navButtons.getLayoutTransition();
            if (lt != null) {
                lt.disableTransitionType(
                        LayoutTransition.CHANGE_APPEARING | LayoutTransition.CHANGE_DISAPPEARING |
                        LayoutTransition.APPEARING | LayoutTransition.DISAPPEARING);
            }
        }

        getBackButton()   .setVisibility(disableBack       ? View.INVISIBLE : View.VISIBLE);
        getHomeButton()   .setVisibility(disableHome       ? View.INVISIBLE : View.VISIBLE);
        getRecentsButton().setVisibility(disableRecent     ? View.INVISIBLE : View.VISIBLE);

        final boolean shouldShowSearch = disableHome && !disableSearch;
        getSearchLight().setVisibility(shouldShowSearch ? View.VISIBLE : View.GONE);
        final View cameraButton = getCameraButton();
        if (cameraButton != null) {
            cameraButton.setVisibility(
                    shouldShowSearch && !mCameraDisabledByDpm ? View.VISIBLE : View.GONE);
        }
    }

    private boolean isCameraDisabledByDpm() {
        final DevicePolicyManager dpm =
                (DevicePolicyManager) mContext.getSystemService(Context.DEVICE_POLICY_SERVICE);
        if (dpm != null) {
            try {
                final int userId = ActivityManagerNative.getDefault().getCurrentUser().id;
                final int disabledFlags = dpm.getKeyguardDisabledFeatures(null, userId);
                final  boolean disabledBecauseKeyguardSecure =
                        (disabledFlags & DevicePolicyManager.KEYGUARD_DISABLE_SECURE_CAMERA) != 0
                        && KeyguardTouchDelegate.getInstance(getContext()).isSecure();
                return dpm.getCameraDisabled(null) || disabledBecauseKeyguardSecure;
            } catch (RemoteException e) {
                Log.e(TAG, "Can't get userId", e);
            }
        }
        return false;
    }

    public void setSlippery(boolean newSlippery) {
        WindowManager.LayoutParams lp = (WindowManager.LayoutParams) getLayoutParams();
        if (lp != null) {
            boolean oldSlippery = (lp.flags & WindowManager.LayoutParams.FLAG_SLIPPERY) != 0;
            if (!oldSlippery && newSlippery) {
                lp.flags |= WindowManager.LayoutParams.FLAG_SLIPPERY;
            } else if (oldSlippery && !newSlippery) {
                lp.flags &= ~WindowManager.LayoutParams.FLAG_SLIPPERY;
            } else {
                return;
            }
            WindowManager wm = (WindowManager)getContext().getSystemService(Context.WINDOW_SERVICE);
            wm.updateViewLayout(this, lp);
        }
    }

    public void setMenuVisibility(final boolean show) {
        setMenuVisibility(show, false);
    }

    public void setMenuVisibility(final boolean show, final boolean force) {
        if (!force && mShowMenu == show) return;

        mShowMenu = show;

        getMenuButton().setVisibility(mShowMenu ? View.VISIBLE : View.INVISIBLE);
    }

    @Override
    public void onFinishInflate() {
        mRotatedViews[Surface.ROTATION_0] =
        mRotatedViews[Surface.ROTATION_180] = findViewById(R.id.rot0);

        mRotatedViews[Surface.ROTATION_90] = findViewById(R.id.rot90);

        mRotatedViews[Surface.ROTATION_270] = NAVBAR_ALWAYS_AT_RIGHT
                                                ? findViewById(R.id.rot90)
                                                : findViewById(R.id.rot270);

        mCurrentView = mRotatedViews[Surface.ROTATION_0];


        final AccessibilityManager accessibilityManager =
                (AccessibilityManager) mContext.getSystemService(Context.ACCESSIBILITY_SERVICE);
        if (accessibilityManager.isEnabled()) {
            // In accessibility mode, we add a simple click handler since swipe is tough to
            // trigger near screen edges.
            View camera = getCameraButton();
            View searchLight = getSearchLight();
            if (camera != null || searchLight != null) {
                OnClickListener listener = new OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        launchForAccessibilityClick(v);
                    }
                };
                if (camera != null) {
                    camera.setOnClickListener(listener);
                }
                if (searchLight != null) {
                    searchLight.setOnClickListener(listener);
                }
            }
        } else {
            // Add a touch handler for camera icon for all view orientations.
            for (int i = 0; i < mRotatedViews.length; i++) {
                View cameraButton = mRotatedViews[i].findViewById(R.id.camera_button);
                if (cameraButton != null) {
                    cameraButton.setOnTouchListener(mCameraTouchListener);
                }
            }
        }
    }

    protected void launchForAccessibilityClick(View v) {
        if (v == getCameraButton()) {
            KeyguardTouchDelegate.getInstance(getContext()).launchCamera();
        } else if (v == getSearchLight()) {
            KeyguardTouchDelegate.getInstance(getContext()).showAssistant();
        }
    }

    public boolean isVertical() {
        return mVertical;
    }

    public void reorient() {
        final int rot = mDisplay.getRotation();
        for (int i=0; i<4; i++) {
            mRotatedViews[i].setVisibility(View.GONE);
        }
        mCurrentView = mRotatedViews[rot];
        mCurrentView.setVisibility(View.VISIBLE);

        mDeadZone = (DeadZone) mCurrentView.findViewById(R.id.deadzone);

        // force the low profile & disabled states into compliance
        mBarTransitions.init(mVertical);
        setDisabledFlags(mDisabledFlags, true /* force */);
        setMenuVisibility(mShowMenu, true /* force */);

        if (DEBUG) {
            Log.d(TAG, "reorient(): rot=" + mDisplay.getRotation());
        }

        setNavigationIconHints(mNavigationIconHints, true);
    }

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        super.onLayout(changed, l, t, r, b);
        mDelegateHelper.setInitialTouchRegion(getHomeButton(), getBackButton(), getRecentsButton());
    }

    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        if (DEBUG) Log.d(TAG, String.format(
                    "onSizeChanged: (%dx%d) old: (%dx%d)", w, h, oldw, oldh));

        final boolean newVertical = w > 0 && h > w;
        if (newVertical != mVertical) {
            mVertical = newVertical;
            //Log.v(TAG, String.format("onSizeChanged: h=%d, w=%d, vert=%s", h, w, mVertical?"y":"n"));
            reorient();
        }

        postCheckForInvalidLayout("sizeChanged");
        super.onSizeChanged(w, h, oldw, oldh);
    }

    /*
    @Override
    protected void onLayout (boolean changed, int left, int top, int right, int bottom) {
        if (DEBUG) Log.d(TAG, String.format(
                    "onLayout: %s (%d,%d,%d,%d)",
                    changed?"changed":"notchanged", left, top, right, bottom));
        super.onLayout(changed, left, top, right, bottom);
    }

    // uncomment this for extra defensiveness in WORKAROUND_INVALID_LAYOUT situations: if all else
    // fails, any touch on the display will fix the layout.
    @Override
    public boolean onInterceptTouchEvent(MotionEvent ev) {
        if (DEBUG) Log.d(TAG, "onInterceptTouchEvent: " + ev.toString());
        if (ev.getAction() == MotionEvent.ACTION_DOWN) {
            postCheckForInvalidLayout("touch");
        }
        return super.onInterceptTouchEvent(ev);
    }
    */


    private String getResourceName(int resId) {
        if (resId != 0) {
            final android.content.res.Resources res = mContext.getResources();
            try {
                return res.getResourceName(resId);
            } catch (android.content.res.Resources.NotFoundException ex) {
                return "(unknown)";
            }
        } else {
            return "(null)";
        }
    }

    private void postCheckForInvalidLayout(final String how) {
        mHandler.obtainMessage(MSG_CHECK_INVALID_LAYOUT, 0, 0, how).sendToTarget();
    }

    private static String visibilityToString(int vis) {
        switch (vis) {
            case View.INVISIBLE:
                return "INVISIBLE";
            case View.GONE:
                return "GONE";
            default:
                return "VISIBLE";
        }
    }

    public void dump(FileDescriptor fd, PrintWriter pw, String[] args) {
        pw.println("NavigationBarView {");
        final Rect r = new Rect();
        final Point size = new Point();
        mDisplay.getRealSize(size);

        pw.println(String.format("      this: " + PhoneStatusBar.viewInfo(this)
                        + " " + visibilityToString(getVisibility())));

        getWindowVisibleDisplayFrame(r);
        final boolean offscreen = r.right > size.x || r.bottom > size.y;
        pw.println("      window: "
                + r.toShortString()
                + " " + visibilityToString(getWindowVisibility())
                + (offscreen ? " OFFSCREEN!" : ""));

        pw.println(String.format("      mCurrentView: id=%s (%dx%d) %s",
                        getResourceName(mCurrentView.getId()),
                        mCurrentView.getWidth(), mCurrentView.getHeight(),
                        visibilityToString(mCurrentView.getVisibility())));

        pw.println(String.format("      disabled=0x%08x vertical=%s menu=%s",
                        mDisabledFlags,
                        mVertical ? "true" : "false",
                        mShowMenu ? "true" : "false"));

        final View back = getBackButton();
        final View home = getHomeButton();
        final View recent = getRecentsButton();
        final View menu = getMenuButton();

        pw.println("      back: "
                + PhoneStatusBar.viewInfo(back)
                + " " + visibilityToString(back.getVisibility())
                );
        pw.println("      home: "
                + PhoneStatusBar.viewInfo(home)
                + " " + visibilityToString(home.getVisibility())
                );
        pw.println("      rcnt: "
                + PhoneStatusBar.viewInfo(recent)
                + " " + visibilityToString(recent.getVisibility())
                );
        pw.println("      menu: "
                + PhoneStatusBar.viewInfo(menu)
                + " " + visibilityToString(menu.getVisibility())
                );
        pw.println("    }");
    }

}