package roboguice.fragment.support;

import roboguice.fragment.FragmentUtil.f;
import roboguice.inject.ContextSingleton;

import com.google.inject.Inject;
import com.google.inject.Provider;

import android.app.Activity;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.support.v4.app.FragmentManager;
import android.view.View;

/**
 * Support v4 based implementation of Fragment utility class.
 * @author Charles Munger
 */
@SuppressWarnings("unchecked") //we're being ambiguous on purpose
public class SupportFragmentUtil implements f<Fragment, FragmentManager> {
    // Incredible hack required to ensure that classes are loaded at construction time
    // I.E. so that it fails fast if they're not found. TODO fix this
    public SupportFragmentUtil() throws ClassNotFoundException {
        Class.forName(Fragment.class.getName());
        Class.forName(FragmentManager.class.getName());
    }
    
    @Override
    public View getView(Fragment frag) {
        return frag.getView();
    }

    @Override
    public Fragment findFragmentById(FragmentManager fm, int id) {
        return fm.findFragmentById(id);
    }

    @Override
    public Fragment findFragmentByTag(FragmentManager fm, String tag) {
        return fm.findFragmentByTag(tag);
    }

    @Override
    public Class<Fragment> fragmentType() {
        return Fragment.class;
    }

    @Override
    public Class<FragmentManager> fragmentManagerType() {
        return FragmentManager.class;
    }

    @SuppressWarnings("rawtypes")
    @Override
    public Class fragmentManagerProviderType() {
        return FragmentManagerProvider.class;
    }

    @ContextSingleton
    public static class FragmentManagerProvider implements Provider<FragmentManager> {
        @Inject protected Activity activity;

        @Override
        public FragmentManager get() {
            return ((FragmentActivity)activity).getSupportFragmentManager();
        }
    }

}