/*
 * Copyright (c) 2006-2017 DMDirc Developers
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated
 * documentation files (the "Software"), to deal in the Software without restriction, including without limitation the
 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to
 * permit persons to whom the Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
 * WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS
 * OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

package com.dmdirc.addons.ui_swing.dialogs.prefs;

import com.dmdirc.addons.ui_swing.components.GenericTableModel;
import com.dmdirc.addons.ui_swing.components.IconManager;
import com.dmdirc.addons.ui_swing.components.PackingTable;
import com.dmdirc.addons.ui_swing.components.URLProtocolPanel;
import com.dmdirc.addons.ui_swing.dialogs.StandardInputDialog;
import com.dmdirc.addons.ui_swing.injection.MainWindow;
import com.dmdirc.config.GlobalConfig;
import com.dmdirc.config.UserConfig;
import com.dmdirc.config.prefs.PreferencesInterface;
import com.dmdirc.config.validators.URLProtocolValidator;
import com.dmdirc.config.provider.AggregateConfigProvider;
import com.dmdirc.config.provider.ConfigProvider;
import java.awt.Dialog.ModalityType;
import java.awt.Window;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.net.URI;
import java.net.URISyntaxException;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import java.util.stream.Collectors;
import javax.inject.Inject;
import javax.swing.JButton;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.ListSelectionModel;
import javax.swing.event.ListSelectionEvent;
import javax.swing.event.ListSelectionListener;
import net.miginfocom.swing.MigLayout;

/**
 * URL Config panel. List all known url protocols and allows them to be configured.
 */
public class URLConfigPanel extends JPanel implements
        ListSelectionListener, ActionListener, PreferencesInterface {

    /** Serial version UID. */
    private static final long serialVersionUID = 1;
    /** The global configuration to read settings from. */
    private final AggregateConfigProvider globalConfig;
    /** The user configuration to store settings in. */
    private final ConfigProvider userConfig;
    /** The icon manager to use for input dialogs. */
    private final IconManager iconManager;
    /** Protocol list. */
    private PackingTable table;
    /** Table mode. */
    private GenericTableModel<URLHandlerHolder> model;
    /** Table scrollpane. */
    private JScrollPane tableScrollPane;
    /** Protocol config panel. */
    private Map<URI, URLProtocolPanel> details;
    /** Empty info panel. */
    private URLProtocolPanel empty;
    /** Current component. */
    private URLProtocolPanel activeComponent;
    /** Add button. */
    private JButton add;
    /** Removed button. */
    private JButton remove;
    /** Selected row. */
    private int selectedRow;
    /** Parent window. */
    private final Window parentWindow;

    /**
     * Instantiates a new URL config panel.
     *
     * @param parentWindow Parent window
     * @param globalConfig The global configuration to read settings from.
     * @param userConfig   The user configuration to write settings to.
     * @param iconManager  The icon manager to use for input dialogs.
     */
    @Inject
    public URLConfigPanel(
            @MainWindow final Window parentWindow,
            @GlobalConfig final AggregateConfigProvider globalConfig,
            @UserConfig final ConfigProvider userConfig,
            final IconManager iconManager) {

        this.parentWindow = parentWindow;
        this.globalConfig = globalConfig;
        this.userConfig = userConfig;
        this.iconManager = iconManager;

        initComponents();
        addListeners();
        layoutComponents();
        selectedRow = -1;
    }

    /**
     * Initialises the components.
     */
    private void initComponents() {
        tableScrollPane = new JScrollPane();
        model = new GenericTableModel<>(URLHandlerHolder.class, "getUri", "getHandler");
        model.setHeaderNames("Protocol", "Handler");
        table = new PackingTable(model, tableScrollPane);
        table.setDefaultRenderer(URISchemeCellRenderer.class, new URISchemeCellRenderer());
        table.setDefaultRenderer(URIHandlerCellRenderer.class, new URIHandlerCellRenderer());
        table.setAutoCreateRowSorter(true);
        table.setAutoCreateColumnsFromModel(true);
        table.setColumnSelectionAllowed(false);
        table.setCellSelectionEnabled(false);
        table.setFillsViewportHeight(false);
        table.setRowSelectionAllowed(true);
        table.setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
        table.getRowSorter().toggleSortOrder(0);
        details = new HashMap<>();
        empty = new URLProtocolPanel(globalConfig, userConfig, null, true);
        activeComponent = empty;
        add = new JButton("Add");
        remove = new JButton("Remove");
        remove.setEnabled(false);

        tableScrollPane.setViewportView(table);

        final Set<String> options = globalConfig.getOptions("protocol").keySet();

        for (final String option : options) {
            try {
                final URI uri = new URI(option + "://example.test.com");
                model.addValue(new URLHandlerHolder(uri, getURLHandler(uri)));
                details.put(uri, new URLProtocolPanel(globalConfig, userConfig, uri, true));
            } catch (final URISyntaxException ex) {
                //Ignore wont happen
            }
        }
    }

    private String getURLHandler(final URI uri) {
        if (globalConfig.hasOptionString("protocol", uri.getScheme())) {
            return globalConfig.getOption("protocol", uri.getScheme());
        } else {
            return "";
        }
    }

    /**
     * Adds listeners.
     */
    private void addListeners() {
        table.getSelectionModel().addListSelectionListener(this);
        add.addActionListener(this);
        remove.addActionListener(this);
    }

    /**
     * Lays out the components.
     */
    private void layoutComponents() {
        removeAll();
        setLayout(new MigLayout("ins 0, wrap 1, nocache"));

        add(tableScrollPane, "growx, pushx, h 150!");
        add(add, "split 2, growx, pushx");
        add(remove, "growx, pushx");
        add(activeComponent, "growx, pushx, wmax 100%");
    }

    @Override
    public void save() {
        valueChanged(null);
        final Map<URI, String> handlers = model.elements().stream()
                .collect(Collectors.toMap(URLHandlerHolder::getUri, URLHandlerHolder::getHandler));
        final Set<String> protocols = globalConfig.getOptions("protocol").keySet();
        for (final String protocol : protocols) {
            URI uri;
            try {
                uri = new URI(protocol + "://example.test.com");
            } catch (final URISyntaxException ex) {
                uri = null;
            }
            if (uri != null && handlers.containsKey(uri)) {
                saveHandler(protocol, handlers.get(uri));
            } else {
                saveHandler(protocol, "");
            }
            handlers.remove(uri);
        }
        for (final Entry<URI, String> entry : handlers.entrySet()) {
            saveHandler(entry.getKey().getScheme(), entry.getValue());
        }
    }

    /**
     * Saves or updates a handler to the config.
     *
     * @param protocol Protocol for the handler
     * @param handler  Handler for the protocol
     */
    private void saveHandler(final String protocol, final String handler) {
        if (handler.isEmpty()) {
            userConfig.unsetOption("protocol", protocol);
        } else {
            userConfig.setOption("protocol", protocol, handler);

        }

    }

    @Override
    public void valueChanged(final ListSelectionEvent e) {
        if (e == null || !e.getValueIsAdjusting()) {
            setVisible(false);
            if (selectedRow != -1 && selectedRow < model.getRowCount()) {
                final URLProtocolPanel panel = details.get(model.getValue(selectedRow).getUri());
                model.getValue(selectedRow).setHandler(panel.getSelection());
            }
            if (table.getSelectedRow() == -1) {
                activeComponent = empty;
                layoutComponents();
                add.setEnabled(false);
                remove.setEnabled(false);
                selectedRow = -1;
            } else {
                activeComponent = details.get(model.getValue(table.getRowSorter().
                        convertRowIndexToModel(table.getSelectedRow())).getUri());
                layoutComponents();
                add.setEnabled(true);
                remove.setEnabled(true);
                selectedRow = table.getRowSorter().convertRowIndexToModel(table.
                        getSelectedRow());
            }
            setVisible(true);
        }
    }

    @Override
    public void actionPerformed(final ActionEvent e) {
        if (e.getSource() == add) {
            new StandardInputDialog(parentWindow,
                    ModalityType.MODELESS, iconManager, "New URL handler",
                    "Please enter the name of the new protocol.",
                    new URLProtocolValidator(globalConfig), this::saveAddNewURLHandler).display();

        } else if (e.getSource() == remove) {
            model.removeValue(model.getValue(table.getRowSorter().convertRowIndexToModel(
                    table.getSelectedRow())));
        }
    }

    private boolean saveAddNewURLHandler(final String text) {
        try {
            final URI uri = new URI(text + "://example.test.com");
            model.addValue(new URLHandlerHolder(uri, getURLHandler(uri)));
            details.put(uri, new URLProtocolPanel(globalConfig, userConfig, uri, true));
            return true;
        } catch (final URISyntaxException ex) {
            return false;
        }
    }

}