/* -*- Mode: Java; c-basic-offset: 4; tab-width: 4; indent-tabs-mode: nil; -*-
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

package org.mozilla.gecko;

import java.io.*;
import java.util.*;
import java.util.regex.Pattern;
import java.util.regex.Matcher;
import java.util.zip.*;
import java.nio.*;
import java.util.concurrent.*;
import java.lang.reflect.*;
import java.net.*;

import org.json.*;

import android.os.*;
import android.app.*;
import android.text.*;
import android.view.*;
import android.view.inputmethod.*;
import android.content.*;
import android.content.res.*;
import android.graphics.*;
import android.graphics.drawable.Drawable;
import android.widget.*;
import android.hardware.*;
import android.location.*;

import android.util.*;
import android.net.*;
import android.database.*;
import android.database.sqlite.*;
import android.provider.*;
import android.content.pm.*;
import android.content.pm.PackageManager.*;
import dalvik.system.*;

abstract public class BrowserApp extends GeckoApp
                                 implements TabsPanel.TabsLayoutChangeListener,
                                            PropertyAnimator.PropertyAnimationListener {
    private static final String LOGTAG = "GeckoBrowserApp";

    public static BrowserToolbar mBrowserToolbar;
    private AboutHomeContent mAboutHomeContent;

    private PropertyAnimator mMainLayoutAnimator;

    @Override
    public void onTabChanged(Tab tab, Tabs.TabEvents msg, Object data) {
        switch(msg) {
            case LOCATION_CHANGE:
                if (Tabs.getInstance().isSelectedTab(tab)) {
                    String url = tab.getURL();
                    if (url.equals("about:home"))
                        showAboutHome();
                    else 
                        hideAboutHome();
                    maybeCancelFaviconLoad(tab);
                }
                break;
            case START:
                if (Tabs.getInstance().isSelectedTab(tab)) {
                    invalidateOptionsMenu();
                }
            case STOP:
                if (Tabs.getInstance().isSelectedTab(tab)) {
                    invalidateOptionsMenu();
                }
                break;
            case SELECTED:
                if ("about:home".equals(tab.getURL()))
                    showAboutHome();
                else
                    hideAboutHome();
                break;
        }
        super.onTabChanged(tab, msg, data);
    }

    @Override
    void handlePageShow(final int tabId) {
        super.handlePageShow(tabId);
        final Tab tab = Tabs.getInstance().getTab(tabId);
        if (tab == null)
            return;

        mMainHandler.post(new Runnable() {
            public void run() {
                loadFavicon(tab);
            }
        });
    }

    @Override
    void handleLinkAdded(final int tabId, String rel, final String href, int size) {
        super.handleLinkAdded(tabId, rel, href, size);
        if (rel.indexOf("[icon]") == -1)
            return;

        final Tab tab = Tabs.getInstance().getTab(tabId);
        if (tab == null)
            return;

        // If tab is not loading and the favicon is updated, we
        // want to load the image straight away. If tab is still
        // loading, we only load the favicon once the page's content
        // is fully loaded (see handleContentLoaded()).
        if (tab.getState() != Tab.STATE_LOADING) {
            mMainHandler.post(new Runnable() {
                public void run() {
                    loadFavicon(tab);
                }
            });
        }
    }

    @Override
    void handleClearHistory() {
        updateAboutHomeTopSites();
        super.handleClearHistory();
    }

    @Override
    void handleSecurityChange(final int tabId, final JSONObject identityData) {
        super.handleSecurityChange(tabId, identityData);
        final Tab tab = Tabs.getInstance().getTab(tabId);
        if (tab == null)
            return;

        mMainHandler.post(new Runnable() { 
            public void run() {
                if (Tabs.getInstance().isSelectedTab(tab))
                    mBrowserToolbar.setSecurityMode(tab.getSecurityMode());
            }
        });
    }

    void handleReaderEnabled(final int tabId) {
        super.handleReaderEnabled(tabId);
        final Tab tab = Tabs.getInstance().getTab(tabId);
        if (tab == null)
            return;

        mMainHandler.post(new Runnable() {
            public void run() {
                if (Tabs.getInstance().isSelectedTab(tab))
                    mBrowserToolbar.setReaderMode(tab.getReaderEnabled());
            }
        });
    }

    @Override
    void onStatePurged() {
        mMainHandler.post(new Runnable() {
            public void run() {
                if (mAboutHomeContent != null)
                    mAboutHomeContent.setLastTabsVisibility(false);
            }
        });

        super.onStatePurged();
    }

    @Override
    protected void loadRequest(String url, AwesomeBar.Target target, String searchEngine, boolean userEntered) {
        mBrowserToolbar.setTitle(url);
        super.loadRequest(url, target, searchEngine, userEntered);
    }

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

        LinearLayout actionBar = (LinearLayout) getActionBarLayout();
        mMainLayout.addView(actionBar, 0);

        mBrowserToolbar = new BrowserToolbar(mAppContext);
        mBrowserToolbar.from(actionBar);

        if (mTabsPanel != null)
            mTabsPanel.setTabsLayoutChangeListener(this);

        if (savedInstanceState != null) {
            mBrowserToolbar.setTitle(savedInstanceState.getString(SAVED_STATE_TITLE));
        }
    }

    @Override
    public void onDestroy() {
        super.onDestroy();
        if (mAboutHomeContent != null)
            mAboutHomeContent.onDestroy();
    }

    @Override
    public void onContentChanged() {
        super.onContentChanged();
        if (mAboutHomeContent != null)
            mAboutHomeContent.onActivityContentChanged(this);
    }

    @Override
    protected void finishProfileMigration() {
        // Update about:home with the new information.
        updateAboutHomeTopSites();

        super.finishProfileMigration();
    }

    @Override void initializeChrome(String uri, Boolean isExternalURL) {
        super.initializeChrome(uri, isExternalURL);

        mBrowserToolbar.updateBackButton(false);
        mBrowserToolbar.updateForwardButton(false);

        Intent intent = getIntent();
        String action = intent.getAction();
        String args = intent.getStringExtra("args");
        if (args != null && args.contains("-profile")) {
            Pattern p = Pattern.compile("(?:-profile\\s*)(\\w*)(\\s*)");
            Matcher m = p.matcher(args);
            if (m.find()) {
                mBrowserToolbar.setTitle(null);
            }
        }

        if (uri != null && uri.length() > 0) {
            mBrowserToolbar.setTitle(uri);
        }

        if (!isExternalURL) {
            // show about:home if we aren't restoring previous session
            if (mRestoreMode == GeckoAppShell.RESTORE_NONE) {
                mBrowserToolbar.updateTabCount(1);
                showAboutHome();
            }
        } else {
            mBrowserToolbar.updateTabCount(1);
        }

        mBrowserToolbar.setProgressVisibility(isExternalURL || (mRestoreMode != GeckoAppShell.RESTORE_NONE));
    }

    void toggleChrome(final boolean aShow) {
        mMainHandler.post(new Runnable() {
            public void run() {
                if (aShow) {
                    mBrowserToolbar.show();
                } else {
                    mBrowserToolbar.hide();
                }
            }
        });

        super.toggleChrome(aShow);
    }

    @Override
    void focusChrome() {
        mMainHandler.post(new Runnable() {
            public void run() {
                mBrowserToolbar.setVisibility(View.VISIBLE);
                mBrowserToolbar.requestFocusFromTouch();
            }
        });
    }

    @Override
    public void refreshChrome() {
        // Only ICS phones use a smaller action-bar in landscape mode.
        if (Build.VERSION.SDK_INT >= 14 && !isTablet()) {
            int index = mMainLayout.indexOfChild(mBrowserToolbar.getLayout());
            mMainLayout.removeViewAt(index);

            LinearLayout actionBar = (LinearLayout) getActionBarLayout();
            mMainLayout.addView(actionBar, index);
            mBrowserToolbar.from(actionBar);
            mBrowserToolbar.refresh();
        }

        invalidateOptionsMenu();
        mTabsPanel.refresh();
    }

    public View getActionBarLayout() {
        int actionBarRes;

        if (!GeckoApp.mAppContext.hasPermanentMenuKey() || GeckoApp.mAppContext.isTablet())
           actionBarRes = R.layout.browser_toolbar_menu;
        else
           actionBarRes = R.layout.browser_toolbar;

        LinearLayout actionBar = (LinearLayout) LayoutInflater.from(GeckoApp.mAppContext).inflate(actionBarRes, null);
        actionBar.setLayoutParams(new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT,
                                                                (int) mAppContext.getResources().getDimension(R.dimen.browser_toolbar_height)));
        return actionBar;
    }

    @Override
    public boolean hasTabsSideBar() {
        return (mTabsPanel != null && mTabsPanel.isSideBar());
    }

    void addTab() {
        showAwesomebar(AwesomeBar.Target.NEW_TAB);
    }

    public void showLocalTabs() {
        showTabs(TabsPanel.Panel.LOCAL_TABS);
    }

    public void showRemoteTabs() {
        showTabs(TabsPanel.Panel.REMOTE_TABS);
    }

    private void showTabs(TabsPanel.Panel panel) {
        if (!sIsGeckoReady)
            return;

        mTabsPanel.show(panel);
    }

    public void hideTabs() {
        mTabsPanel.hide();
    }

    public boolean autoHideTabs() {
        if (!hasTabsSideBar() && areTabsShown()) {
            hideTabs();
            return true;
        }
        return false;
    }

    public boolean areTabsShown() {
        return mTabsPanel.isShown();
    }

    @Override
    public void onTabsLayoutChange(int width, int height) {
        if (mMainLayoutAnimator != null)
            mMainLayoutAnimator.stop();

        if (mTabsPanel.isShown())
            mTabsPanel.setDescendantFocusability(ViewGroup.FOCUS_AFTER_DESCENDANTS);

        mMainLayoutAnimator = new PropertyAnimator(150);
        mMainLayoutAnimator.setPropertyAnimationListener(this);

        if (hasTabsSideBar()) {
            mMainLayoutAnimator.attach(mBrowserToolbar.getLayout(),
                                       PropertyAnimator.Property.SHRINK_LEFT,
                                       width);

            // Set the gecko layout for sliding.
            if (!mTabsPanel.isShown()) {
                ((LinearLayout.LayoutParams) mGeckoLayout.getLayoutParams()).setMargins(0, 0, 0, 0);
                mGeckoLayout.scrollTo(mTabsPanel.getWidth() * -1, 0);
                mGeckoLayout.requestLayout();
            }

            mMainLayoutAnimator.attach(mGeckoLayout,
                                       PropertyAnimator.Property.SLIDE_LEFT,
                                       width);

        } else {
            mMainLayoutAnimator.attach(mMainLayout,
                                       PropertyAnimator.Property.SLIDE_TOP,
                                       height);
        }

        mMainLayoutAnimator.start();
    }

    @Override
    public void onPropertyAnimationStart() {
        mMainHandler.post(new Runnable() {
            public void run() {
                mBrowserToolbar.updateTabs(true);
            }
        });
    }

    @Override
    public void onPropertyAnimationEnd() {
        mMainHandler.post(new Runnable() {
            public void run() {
                if (hasTabsSideBar() && mTabsPanel.isShown()) {
                    // Fake the gecko layout to have been shrunk, instead of sliding.
                    ((LinearLayout.LayoutParams) mGeckoLayout.getLayoutParams()).setMargins(mTabsPanel.getWidth(), 0, 0, 0);
                    mGeckoLayout.scrollTo(0, 0);
                    mGeckoLayout.requestLayout();
                }

                if (!mTabsPanel.isShown()) {
                    mBrowserToolbar.updateTabs(false);
                    mTabsPanel.setDescendantFocusability(ViewGroup.FOCUS_BLOCK_DESCENDANTS);
                }
            }
        });
    }

    /* Doorhanger notification methods */
    @Override
    void updatePopups(final Tab tab) {
        mDoorHangerPopup.updatePopup(mBrowserToolbar.mFavicon);
    }

    @Override
    void addDoorHanger(String message, String value, JSONArray buttons, Tab tab, JSONObject options) {
        mDoorHangerPopup.addDoorHanger(message, value, buttons, tab, options, mBrowserToolbar.mFavicon);
    }

    /* Favicon methods */
    private void loadFavicon(final Tab tab) {
        maybeCancelFaviconLoad(tab);

        long id = getFavicons().loadFavicon(tab.getURL(), tab.getFaviconURL(),
                        new Favicons.OnFaviconLoadedListener() {

            public void onFaviconLoaded(String pageUrl, Drawable favicon) {
                // Leave favicon UI untouched if we failed to load the image
                // for some reason.
                if (favicon == null)
                    return;

                Log.i(LOGTAG, "Favicon successfully loaded for URL = " + pageUrl);

                // The tab might be pointing to another URL by the time the
                // favicon is finally loaded, in which case we simply ignore it.
                if (!tab.getURL().equals(pageUrl))
                    return;

                Log.i(LOGTAG, "Favicon is for current URL = " + pageUrl);

                tab.updateFavicon(favicon);
                tab.setFaviconLoadId(Favicons.NOT_LOADING);

                if (Tabs.getInstance().isSelectedTab(tab))
                    mBrowserToolbar.setFavicon(tab.getFavicon());

                Tabs.getInstance().notifyListeners(tab, Tabs.TabEvents.FAVICON);
            }
        });

        tab.setFaviconLoadId(id);
    }

    private void maybeCancelFaviconLoad(Tab tab) {
        long faviconLoadId = tab.getFaviconLoadId();

        if (faviconLoadId == Favicons.NOT_LOADING)
            return;

        // Cancel pending favicon load task
        getFavicons().cancelFaviconLoad(faviconLoadId);

        // Reset favicon load state
        tab.setFaviconLoadId(Favicons.NOT_LOADING);
    }


    /* About:home UI */
    void updateAboutHomeTopSites() {
        if (mAboutHomeContent == null)
            return;

        GeckoApp.mAppContext.mMainHandler.post(new Runnable() {
            public void run() {
                mAboutHomeContent.update(GeckoApp.mAppContext,
                        EnumSet.of(AboutHomeContent.UpdateFlags.TOP_SITES));
            }
        });
    }

    public void showAboutHome() {
        Runnable r = new AboutHomeRunnable(true);
        mMainHandler.postAtFrontOfQueue(r);
    }

    public void hideAboutHome() {
        Runnable r = new AboutHomeRunnable(false);
        mMainHandler.postAtFrontOfQueue(r);
    }

    public class AboutHomeRunnable implements Runnable {
        boolean mShow;
        AboutHomeRunnable(boolean show) {
            mShow = show;
        }

        public void run() {
            mFormAssistPopup.hide();
            if (mShow) {
                if (mAboutHomeContent == null) {
                    mAboutHomeContent = (AboutHomeContent) findViewById(R.id.abouthome_content);
                    mAboutHomeContent.init();
                    mAboutHomeContent.update(GeckoApp.mAppContext, AboutHomeContent.UpdateFlags.ALL);
                    mAboutHomeContent.setUriLoadCallback(new AboutHomeContent.UriLoadCallback() {
                        public void callback(String url) {
                            mBrowserToolbar.setProgressVisibility(true);
                            loadUrl(url, AwesomeBar.Target.CURRENT_TAB);
                        }
                    });
                    mAboutHomeContent.setOnInterceptTouchListener(new ContentTouchListener());
                } else {
                    mAboutHomeContent.update(GeckoApp.mAppContext,
                                             EnumSet.of(AboutHomeContent.UpdateFlags.TOP_SITES,
                                                        AboutHomeContent.UpdateFlags.REMOTE_TABS));
                }
            
                mAboutHomeContent.setVisibility(View.VISIBLE);
            } else {
                findViewById(R.id.abouthome_content).setVisibility(View.GONE);
            }
        } 
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu)
    {
        mMenu = menu;

        // Inform the menu about the action-items bar. 
        if (menu instanceof GeckoMenu && isTablet())
            ((GeckoMenu) menu).setActionItemBarPresenter(mBrowserToolbar);

        MenuInflater inflater = getMenuInflater();
        inflater.inflate(R.menu.gecko_menu, mMenu);
        return true;
    }

    @Override
    public void openOptionsMenu() {
        // Scroll custom menu to the top
        if (mMenuPanel != null)
            mMenuPanel.scrollTo(0, 0);

        if (!mBrowserToolbar.openOptionsMenu())
            super.openOptionsMenu();
    }

    @Override
    public void closeOptionsMenu() {
        if (!mBrowserToolbar.closeOptionsMenu())
            super.closeOptionsMenu();
    }

    @Override
    public void setFullScreen(final boolean fullscreen) {
      super.setFullScreen(fullscreen);
      mMainHandler.post(new Runnable() {
          public void run() {
              if (fullscreen)
                  mBrowserToolbar.hide();
              else
                  mBrowserToolbar.show();
          }
      });
    }

    @Override
    public boolean onPrepareOptionsMenu(Menu aMenu)
    {
        if (aMenu == null)
            return false;

        if (!sIsGeckoReady)
            aMenu.findItem(R.id.settings).setEnabled(false);

        Tab tab = Tabs.getInstance().getSelectedTab();
        MenuItem bookmark = aMenu.findItem(R.id.bookmark);
        MenuItem forward = aMenu.findItem(R.id.forward);
        MenuItem share = aMenu.findItem(R.id.share);
        MenuItem readingList = aMenu.findItem(R.id.reading_list);
        MenuItem saveAsPDF = aMenu.findItem(R.id.save_as_pdf);
        MenuItem charEncoding = aMenu.findItem(R.id.char_encoding);
        MenuItem findInPage = aMenu.findItem(R.id.find_in_page);
        MenuItem desktopMode = aMenu.findItem(R.id.desktop_mode);

        if (tab == null || tab.getURL() == null) {
            bookmark.setEnabled(false);
            forward.setEnabled(false);
            share.setEnabled(false);
            readingList.setEnabled(false);
            saveAsPDF.setEnabled(false);
            findInPage.setEnabled(false);
            return true;
        }

        bookmark.setEnabled(!tab.getURL().startsWith("about:reader"));
        bookmark.setCheckable(true);
        
        if (tab.isBookmark()) {
            bookmark.setChecked(true);
            bookmark.setIcon(R.drawable.ic_menu_bookmark_remove);
        } else {
            bookmark.setChecked(false);
            bookmark.setIcon(R.drawable.ic_menu_bookmark_add);
        }

        readingList.setEnabled(tab.getReaderEnabled());
        readingList.setCheckable(true);

        if (tab.isReadingListItem()) {
            readingList.setChecked(true);
            readingList.setIcon(R.drawable.ic_menu_reading_list_remove);
        } else {
            readingList.setChecked(false);
            readingList.setIcon(R.drawable.ic_menu_reading_list_add);
        }

        forward.setEnabled(tab.canDoForward());
        desktopMode.setChecked(tab.getDesktopMode());

        // Disable share menuitem for about:, chrome:, file:, and resource: URIs
        String scheme = Uri.parse(tab.getURL()).getScheme();
        share.setEnabled(!(scheme.equals("about") || scheme.equals("chrome") ||
                           scheme.equals("file") || scheme.equals("resource")));

        // Disable save as PDF for about:home and xul pages
        saveAsPDF.setEnabled(!(tab.getURL().equals("about:home") ||
                               tab.getContentType().equals("application/vnd.mozilla.xul+xml")));

        // Disable find in page for about:home, since it won't work on Java content
        findInPage.setEnabled(!tab.getURL().equals("about:home"));

        charEncoding.setVisible(GeckoPreferences.getCharEncodingState());

        return true;
    }
}