/*
 * Copyright (c) 2011, 2012 Roberto Tyley
 *
 * This file is part of 'Agit' - an Android Git client.
 *
 * Agit is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Agit is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see http://www.gnu.org/licenses/ .
 */

package com.madgag.agit;

import static com.google.common.collect.Maps.newEnumMap;
import static com.madgag.agit.git.model.Relation.CHILD;
import static com.madgag.agit.git.model.Relation.PARENT;
import android.content.Context;
import android.util.AttributeSet;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.LinearLayout;

import com.madgag.agit.git.model.Relation;

import java.io.IOException;
import java.util.Map;

import org.eclipse.jgit.errors.IncorrectObjectTypeException;
import org.eclipse.jgit.lib.ObjectId;
import org.eclipse.jgit.revplot.PlotCommit;
import org.eclipse.jgit.revplot.PlotLane;

public class CommitNavigationView extends LinearLayout {

    private final LayoutInflater layoutInflater;
    private final Map<Relation, ViewGroup> buttonGroups = newEnumMap(Relation.class);

    private CommitSelectedListener commitSelectedListener;

    public CommitNavigationView(Context context, AttributeSet attrs) {
        super(context, attrs);
        layoutInflater = LayoutInflater.from(context);

        layoutInflater.inflate(R.layout.commit_navigation_view, this);
        buttonGroups.put(PARENT, (ViewGroup) findViewById(R.id.commit_parent_navigation));
        buttonGroups.put(CHILD, (ViewGroup) findViewById(R.id.commit_child_navigation));
    }

    public void setCommit(PlotCommit<PlotLane> commit) {
        addButtonsFor(commit, PARENT);
        addButtonsFor(commit, CHILD);
    }

    private void addButtonsFor(PlotCommit<PlotLane> commit, final Relation relation) {
        ViewGroup buttonGroup = buttonGroups.get(relation);
        buttonGroup.removeAllViews();
        View.OnClickListener clickListener = new View.OnClickListener() {
            @SuppressWarnings("unchecked")
            public void onClick(View v) {
                commitSelectedListener.onCommitSelected(relation, (PlotCommit<PlotLane>) v.getTag());
            }
        };

        for (PlotCommit<PlotLane> relatedCommit : relation.relationsOf(commit)) {
            Button button = (Button) layoutInflater.inflate(R.layout.related_commit_button, buttonGroup, false);
            button.setTag(relatedCommit);
            String abbrId = relatedCommit.getName().substring(0, 4);
            String buttonText = (relation == PARENT) ? ("« " + abbrId) : (abbrId + " »");
            button.setText(buttonText);
            button.setOnClickListener(clickListener);
            buttonGroup.addView(button);
        }
    }

    public void setCommitSelectedListener(
            CommitSelectedListener commitSelectedListener) {
        this.commitSelectedListener = commitSelectedListener;
    }

    public interface CommitSelectedListener {
        PlotCommit<PlotLane> plotCommitFor(ObjectId objectId) throws IOException;
        void onCommitSelected(Relation relation, PlotCommit<PlotLane> commit);
    }
}