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/**
 * Copyright 2017 Alex Yanchenko
 *
 * 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 org.droidparts.inner.reader;

import java.lang.reflect.Method;

import android.content.Context;
import android.preference.Preference;
import android.preference.PreferenceActivity;
import android.view.View;

import org.droidparts.inner.TypeHelper;
import org.droidparts.util.L;
import org.droidparts.util.ResourceUtils;

public class ViewAndPreferenceReader {

	static Object readVal(Context ctx, View rootView, int viewOrPrefId, boolean click, Object target, Class valType,
	                      String valName) throws Exception {
		boolean isView = TypeHelper.isView(valType);
		boolean isPreference = TypeHelper.isPreference(valType);
		if (!isView && !isPreference) {
			throw new Exception("Not a View or Preference '" + valType.getName() + "'.");
		}
		if (viewOrPrefId == 0) {
			if (isView) {
				viewOrPrefId = ResourceUtils.getResourceId(ctx, valName);
			} else {
				viewOrPrefId = ResourceUtils.getStringId(ctx, valName);
			}
		}
		Object viewOrPref = null;
		if (isView) {
			if (rootView == null) {
				throw new IllegalArgumentException("Null View.");
			}
			viewOrPref = rootView.findViewById(viewOrPrefId);
		} else {
			String prefKey = ctx.getString(viewOrPrefId);
			if (target instanceof PreferenceActivity) {
				viewOrPref = ((PreferenceActivity) target).findPreference(prefKey);
			} else {
				viewOrPref = findPreferenceInFragment(target, prefKey);
			}
		}
		if (viewOrPref != null) {
			if (click) {
				if (isView) {
					boolean success = setListener((View) viewOrPref, target);
					if (!success) {
						L.w("Failed to set OnClickListener");
					}
				} else {
					boolean success = setListener((Preference) viewOrPref, target);
					if (!success) {
						L.w("Failed to set OnPreferenceClickListener or OnPreferenceChangeListener.");
					}
				}
			}
		}
		return viewOrPref;
	}

	private static Preference findPreferenceInFragment(Object prefFragment, String prefKey) {
		try {
			if (findPreferenceMethod == null) {
				findPreferenceMethod = prefFragment.getClass().getMethod("findPreference", CharSequence.class);
			}
			return (Preference) findPreferenceMethod.invoke(prefFragment, prefKey);
		} catch (Exception e) {
			L.d(e);
			return null;
		}
	}

	private static Method findPreferenceMethod;

	private static boolean setListener(View view, Object target) {
		if (target instanceof View.OnClickListener) {
			view.setOnClickListener((View.OnClickListener) target);
			return true;
		}
		return false;
	}

	private static boolean setListener(Preference pref, Object target) {
		boolean success = false;
		if (target instanceof Preference.OnPreferenceClickListener) {
			pref.setOnPreferenceClickListener((Preference.OnPreferenceClickListener) target);
			success = true;
		}
		if (target instanceof Preference.OnPreferenceChangeListener) {
			pref.setOnPreferenceChangeListener((Preference.OnPreferenceChangeListener) target);
			success = true;
		}
		return success;
	}

}