package cgeo.geocaching;

import butterknife.ButterKnife;
import butterknife.InjectView;

import cgeo.geocaching.activity.AbstractViewPagerActivity;
import cgeo.geocaching.ui.AbstractCachingPageViewCreator;
import cgeo.geocaching.ui.AnchorAwareLinkMovementMethod;
import cgeo.geocaching.utils.Version;

import org.apache.commons.io.IOUtils;
import org.apache.commons.lang3.CharEncoding;
import org.apache.commons.lang3.StringUtils;
import org.apache.commons.lang3.tuple.ImmutablePair;
import org.apache.commons.lang3.tuple.Pair;

import android.content.Context;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.widget.ScrollView;
import android.widget.TextView;

import java.io.InputStream;
import java.util.Arrays;
import java.util.List;
import java.util.Scanner;

public class AboutActivity extends AbstractViewPagerActivity<AboutActivity.Page> {

    private static final String EXTRA_ABOUT_STARTPAGE = "cgeo.geocaching.extra.about.startpage";

    class LicenseViewCreator extends AbstractCachingPageViewCreator<ScrollView> {

        @InjectView(R.id.license) protected TextView licenseLink;
        @InjectView(R.id.license_text) protected TextView licenseText;

        @Override
        public ScrollView getDispatchedView() {
            final ScrollView view = (ScrollView) getLayoutInflater().inflate(R.layout.about_license_page, null);
            ButterKnife.inject(this, view);
            setClickListener(licenseLink, "http://www.apache.org/licenses/LICENSE-2.0.html");
            licenseText.setText(getRawResourceString(R.raw.license));
            return view;
        }
    }

    class ContributorsViewCreator extends AbstractCachingPageViewCreator<ScrollView> {

        @InjectView(R.id.contributors) protected TextView contributors;

        @Override
        public ScrollView getDispatchedView() {
            final ScrollView view = (ScrollView) getLayoutInflater().inflate(R.layout.about_contributors_page, null);
            ButterKnife.inject(this, view);
            contributors.setMovementMethod(AnchorAwareLinkMovementMethod.getInstance());
            return view;
        }

    }

    class ChangeLogViewCreator extends AbstractCachingPageViewCreator<ScrollView> {

        @InjectView(R.id.changelog_master) protected TextView changeLogMaster;
        @InjectView(R.id.changelog_release) protected TextView changeLogRelease;

        @Override
        public ScrollView getDispatchedView() {
            final ScrollView view = (ScrollView) getLayoutInflater().inflate(R.layout.about_changes_page, null);
            ButterKnife.inject(this, view);
            changeLogRelease.setMovementMethod(AnchorAwareLinkMovementMethod.getInstance());
            final String changeLogMasterString = getString(R.string.changelog_master);
            if (StringUtils.isBlank(changeLogMasterString)) {
                changeLogMaster.setVisibility(View.GONE);
            } else {
                changeLogMaster.setMovementMethod(AnchorAwareLinkMovementMethod.getInstance());
            }
            return view;
        }

    }

    class HelpViewCreator extends AbstractCachingPageViewCreator<ScrollView> {

        @InjectView(R.id.support) protected TextView support;
        @InjectView(R.id.website) protected TextView website;
        @InjectView(R.id.facebook) protected TextView facebook;
        @InjectView(R.id.twitter) protected TextView twitter;
        @InjectView(R.id.market) protected TextView market;
        @InjectView(R.id.faq) protected TextView faq;

        @Override
        public ScrollView getDispatchedView() {
            final ScrollView view = (ScrollView) getLayoutInflater().inflate(R.layout.about_help_page, null);
            ButterKnife.inject(this, view);
            setClickListener(support, "mailto:support@cgeo.org");
            setClickListener(website, "http://www.cgeo.org/");
            setClickListener(facebook, "http://www.facebook.com/pages/cgeo/297269860090");
            setClickListener(twitter, "http://twitter.com/android_gc");
            setClickListener(faq, "http://faq.cgeo.org/");
            market.setOnClickListener(new View.OnClickListener() {

                @Override
                public void onClick(final View v) {
                    market();
                }
            });
            return view;
        }

    }

    class VersionViewCreator extends AbstractCachingPageViewCreator<ScrollView> {

        @InjectView(R.id.about_version_string) protected TextView version;
        @InjectView(R.id.donate) protected TextView donateButton;

        @Override
        public ScrollView getDispatchedView() {
            final ScrollView view = (ScrollView) getLayoutInflater().inflate(R.layout.about_version_page, null);
            ButterKnife.inject(this, view);
            version.setText(Version.getVersionName(AboutActivity.this));
            setClickListener(donateButton, "https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=AQBS7UP76CXW2");
            return view;
        }
    }

    enum Page {
        VERSION(R.string.about_version),
        HELP(R.string.about_help),
        CHANGELOG(R.string.about_changelog),
        CONTRIBUTORS(R.string.about_contributors),
        LICENSE(R.string.about_license);

        private final int resourceId;

        Page(final int resourceId) {
            this.resourceId = resourceId;
        }
    }

    @Override
    public void onCreate(final Bundle savedInstanceState) {
        super.onCreate(savedInstanceState, R.layout.viewpager_activity);

        int startPage = Page.VERSION.ordinal();
        Bundle extras = getIntent().getExtras();
        if (extras != null) {
            startPage = extras.getInt(EXTRA_ABOUT_STARTPAGE, startPage);
        }
        createViewPager(startPage, null);
        reinitializeViewPager();
    }

    public final void setClickListener(final View view, final String url) {
        view.setOnClickListener(new View.OnClickListener() {

            @Override
            public void onClick(final View v) {
                startUrl(url);
            }
        });
    }

    private void startUrl(final String url) {
        startActivity(new Intent(Intent.ACTION_VIEW, Uri.parse(url)));
    }

    final void market() {
        final Intent marketIntent = new Intent(Intent.ACTION_VIEW, Uri.parse("market://details?id=" + getPackageName()));
        marketIntent.addFlags(Intent.FLAG_ACTIVITY_NO_HISTORY | Intent.FLAG_ACTIVITY_CLEAR_WHEN_TASK_RESET);
        startActivity(marketIntent);
    }

    @Override
    protected final cgeo.geocaching.activity.AbstractViewPagerActivity.PageViewCreator createViewCreator(final Page page) {
        switch (page) {
            case VERSION:
                return new VersionViewCreator();
            case HELP:
                return new HelpViewCreator();
            case CHANGELOG:
                return new ChangeLogViewCreator();
            case CONTRIBUTORS:
                return new ContributorsViewCreator();
            case LICENSE:
                return new LicenseViewCreator();
        }
        throw new IllegalStateException(); // cannot happen, when switch case is enum complete
    }

    @Override
    protected final String getTitle(final Page page) {
        return res.getString(page.resourceId);
    }

    @Override
    protected final Pair<List<? extends Page>, Integer> getOrderedPages() {
        final List<Page> pages = Arrays.asList(Page.values());
        return new ImmutablePair<List<? extends Page>, Integer>(pages, 0);
    }

    private String getRawResourceString(final int resourceId) {
        String result;
        Scanner scanner = null;
        try {
            final InputStream ins = res.openRawResource(resourceId);
            scanner = new Scanner(ins, CharEncoding.UTF_8);
            result = scanner.useDelimiter("\\A").next();
            IOUtils.closeQuietly(ins);
        } finally {
            if (scanner != null) {
                scanner.close();
            }
        }
        return result;
    }

    public static void showChangeLog(Context fromActivity) {
        final Intent intent = new Intent(fromActivity, AboutActivity.class);
        intent.putExtra(EXTRA_ABOUT_STARTPAGE, Page.CHANGELOG.ordinal());
        fromActivity.startActivity(intent);
    }

}