package com.android.launcher3.model;

import android.content.Context;
import android.content.pm.ResolveInfo;
import android.util.Log;

import com.android.launcher3.IconCache;
import com.android.launcher3.LauncherAppState;
import com.android.launcher3.LauncherAppWidgetProviderInfo;

import com.android.launcher3.Utilities;
import com.android.launcher3.compat.UserHandleCompat;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.List;

/**
 * Widgets data model that is used by the adapters of the widget views and controllers.
 *
 * <p> The widgets and shortcuts are organized using package name as its index.
 */
public class WidgetsModel {

    private static final String TAG = "WidgetsModel";
    private static final boolean DEBUG = false;

    /* List of packages that is tracked by this model. */
    private ArrayList<PackageItemInfo> mPackageItemInfos = new ArrayList<>();

    /* Map of widgets and shortcuts that are tracked per package. */
    private HashMap<PackageItemInfo, ArrayList<Object>> mWidgetsList = new HashMap<>();

    private ArrayList<Object> mRawList;

    private final Comparator mWidgetAndShortcutNameComparator;
    private final Comparator mAppNameComparator;
    private final IconCache mIconCache;

    public WidgetsModel(Context context) {
        mWidgetAndShortcutNameComparator = new WidgetsAndShortcutNameComparator(context);
        mAppNameComparator = (new AppNameComparator(context)).getAppInfoComparator();
        mIconCache = LauncherAppState.getInstance().getIconCache();
    }

    private WidgetsModel(WidgetsModel model) {
        mPackageItemInfos = (ArrayList<PackageItemInfo>) model.mPackageItemInfos.clone();
        mWidgetsList = (HashMap<PackageItemInfo, ArrayList<Object>>) model.mWidgetsList.clone();
        // mRawList is not copied as should not be needed.
        mWidgetAndShortcutNameComparator = model.mWidgetAndShortcutNameComparator;
        mAppNameComparator = model.mAppNameComparator;
        mIconCache = model.mIconCache;
    }

    // Access methods that may be deleted if the private fields are made package-private.
    public int getPackageSize() {
        return mPackageItemInfos.size();
    }

    // Access methods that may be deleted if the private fields are made package-private.
    public PackageItemInfo getPackageItemInfo(int pos) {
        return mPackageItemInfos.get(pos);
    }

    public List<Object> getSortedWidgets(int pos) {
        return mWidgetsList.get(mPackageItemInfos.get(pos));
    }

    public ArrayList<Object> getRawList() {
        return mRawList;
    }

    public void addWidgetsAndShortcuts(ArrayList<Object> rawWidgetsShortcuts) {
        Utilities.assertWorkerThread();
        mRawList = rawWidgetsShortcuts;
        if (DEBUG) {
            Log.d(TAG, "addWidgetsAndShortcuts, widgetsShortcuts#=" + rawWidgetsShortcuts.size());
        }

        // Temporary list for {@link PackageItemInfos} to avoid having to go through
        // {@link mPackageItemInfos} to locate the key to be used for {@link #mWidgetsList}
        HashMap<String, PackageItemInfo> tmpPackageItemInfos = new HashMap<>();

        // clear the lists.
        mWidgetsList.clear();
        mPackageItemInfos.clear();

        // add and update.
        for (Object o: rawWidgetsShortcuts) {
            String packageName = "";
            if (o instanceof LauncherAppWidgetProviderInfo) {
                LauncherAppWidgetProviderInfo widgetInfo = (LauncherAppWidgetProviderInfo) o;
                packageName = widgetInfo.provider.getPackageName();
            } else if (o instanceof ResolveInfo) {
                ResolveInfo resolveInfo = (ResolveInfo) o;
                packageName = resolveInfo.activityInfo.packageName;
            } else {
                Log.e(TAG, String.format("addWidgetsAndShortcuts, nothing added for class=%s",
                        o.getClass().toString()));
            }

            PackageItemInfo pInfo = tmpPackageItemInfos.get(packageName);
            ArrayList<Object> widgetsShortcutsList = mWidgetsList.get(pInfo);
            if (widgetsShortcutsList != null) {
                widgetsShortcutsList.add(o);
            } else {
                widgetsShortcutsList = new ArrayList<Object>();
                widgetsShortcutsList.add(o);
                pInfo = new PackageItemInfo(packageName);
                mIconCache.getTitleAndIconForApp(packageName, UserHandleCompat.myUserHandle(),
                        true /* userLowResIcon */, pInfo);
                mWidgetsList.put(pInfo, widgetsShortcutsList);
                tmpPackageItemInfos.put(packageName,  pInfo);
                mPackageItemInfos.add(pInfo);
            }
        }

        // sort.
        Collections.sort(mPackageItemInfos, mAppNameComparator);
        for (PackageItemInfo p: mPackageItemInfos) {
            Collections.sort(mWidgetsList.get(p), mWidgetAndShortcutNameComparator);
        }
    }

    /**
     * Create a snapshot of the widgets model.
     * <p>
     * Usage case: view binding without being modified from package updates.
     */
    @Override
    public WidgetsModel clone(){
        return new WidgetsModel(this);
    }
}