/*
 * Copyright (C) 2010 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.graphics;

import com.android.ide.common.rendering.api.LayoutLog;
import com.android.layoutlib.bridge.Bridge;
import com.android.layoutlib.bridge.impl.DelegateManager;
import com.android.tools.layoutlib.annotations.LayoutlibDelegate;

import android.content.res.AssetManager;
import android.graphics.FontFamily_Delegate.FontVariant;

import java.awt.Font;
import java.io.File;
import java.util.ArrayList;
import java.util.List;

/**
 * Delegate implementing the native methods of android.graphics.Typeface
 *
 * Through the layoutlib_create tool, the original native methods of Typeface have been replaced
 * by calls to methods of the same name in this delegate class.
 *
 * This class behaves like the original native implementation, but in Java, keeping previously
 * native data into its own objects and mapping them to int that are sent back and forth between
 * it and the original Typeface class.
 *
 * @see DelegateManager
 *
 */
public final class Typeface_Delegate {

    public static final String SYSTEM_FONTS = "/system/fonts/";

    // ---- delegate manager ----
    private static final DelegateManager<Typeface_Delegate> sManager =
            new DelegateManager<Typeface_Delegate>(Typeface_Delegate.class);

    // ---- delegate helper data ----
    private static String sFontLocation;

    // ---- delegate data ----

    private final FontFamily_Delegate[] mFontFamilies;  // the reference to FontFamily_Delegate.
    private int mStyle;

    private static long sDefaultTypeface;

    // ---- Public Helper methods ----
    public static synchronized void setFontLocation(String fontLocation) {
        sFontLocation = fontLocation;
        FontFamily_Delegate.setFontLocation(fontLocation);
    }

    public static Typeface_Delegate getDelegate(long nativeTypeface) {
        return sManager.getDelegate(nativeTypeface);
    }

    public List<Font> getFonts(FontVariant variant) {
        List<Font> fonts = new ArrayList<Font>(mFontFamilies.length);
        // If we are unable to find fonts matching the variant, we return the fonts from the
        // other variant since we always want to draw something, rather than nothing.
        // TODO: check this behaviour with platform.
        List<Font> otherVariantFonts = new ArrayList<Font>();
        for (FontFamily_Delegate ffd : mFontFamilies) {
            if (ffd != null) {
                Font font = ffd.getFont(mStyle);
                if (font != null) {
                    if (ffd.getVariant() == variant || ffd.getVariant() == FontVariant.NONE) {
                        fonts.add(font);
                    } else {
                        otherVariantFonts.add(font);
                    }
                }
            }
        }
        if (fonts.size() > 0) {
            return fonts;
        }
        return otherVariantFonts;
    }

    // ---- native methods ----

    @LayoutlibDelegate
    /*package*/ static synchronized long nativeCreate(String familyName, int style) {
        Bridge.getLog().fidelityWarning(LayoutLog.TAG_UNSUPPORTED,
                "Could not find font with family \"" + familyName + "\".",
                null /*throwable*/, null /*data*/);
        return 0;
    }

    @LayoutlibDelegate
    /*package*/ static synchronized long nativeCreateFromTypeface(long native_instance, int style) {
        Typeface_Delegate delegate = sManager.getDelegate(native_instance);
        if (delegate == null) {
            delegate = sManager.getDelegate(sDefaultTypeface);
        }
        if (delegate == null) {
            return 0;
        }

        return sManager.addNewDelegate(new Typeface_Delegate(delegate.mFontFamilies, style));
    }

    @LayoutlibDelegate
    /*package*/ static synchronized long nativeCreateFromAsset(AssetManager mgr, String path) {
        Bridge.getLog().fidelityWarning(LayoutLog.TAG_UNSUPPORTED,
                "Typeface.createFromAsset() is not supported.", null /*throwable*/, null /*data*/);
        return 0;
    }

    @LayoutlibDelegate
    /*package*/ static synchronized long nativeCreateFromFile(String path) {
        Bridge.getLog().fidelityWarning(LayoutLog.TAG_UNSUPPORTED,
                "Typeface.createFromFile() is not supported.,", null, null);
        return 0;
    }

    @LayoutlibDelegate
    /*package*/ static synchronized long nativeCreateFromArray(long[] familyArray) {
        FontFamily_Delegate[] fontFamilies = new FontFamily_Delegate[familyArray.length];
        for (int i = 0; i < familyArray.length; i++) {
            fontFamilies[i] = FontFamily_Delegate.getDelegate(familyArray[i]);
        }
        Typeface_Delegate delegate = new Typeface_Delegate(fontFamilies, Typeface.NORMAL);
        return sManager.addNewDelegate(delegate);
    }

    @LayoutlibDelegate
    /*package*/ static void nativeUnref(long native_instance) {
        sManager.removeJavaReferenceFor(native_instance);
    }

    @LayoutlibDelegate
    /*package*/ static int nativeGetStyle(long native_instance) {
        Typeface_Delegate delegate = sManager.getDelegate(native_instance);
        if (delegate == null) {
            return 0;
        }

        return delegate.mStyle;
    }

    @LayoutlibDelegate
    /*package*/ static void nativeSetDefault(long native_instance) {
        sDefaultTypeface = native_instance;
    }

    @LayoutlibDelegate
    /*package*/ static File getSystemFontConfigLocation() {
        return new File(sFontLocation);
    }

    // ---- Private delegate/helper methods ----

    private Typeface_Delegate(FontFamily_Delegate[] fontFamilies, int style) {
        mFontFamilies = fontFamilies;
        mStyle = style;
    }
}