/*
 * 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.osd;

import com.dmdirc.addons.ui_swing.UIUtilities;
import com.dmdirc.addons.ui_swing.injection.MainWindow;
import com.dmdirc.config.prefs.CategoryChangeListener;
import com.dmdirc.config.prefs.PluginPreferencesCategory;
import com.dmdirc.config.prefs.PreferencesCategory;
import com.dmdirc.config.prefs.PreferencesDialogModel;
import com.dmdirc.config.prefs.PreferencesInterface;
import com.dmdirc.config.prefs.PreferencesSetting;
import com.dmdirc.config.prefs.PreferencesType;
import com.dmdirc.config.prefs.SettingChangeListener;
import com.dmdirc.events.ClientPrefsOpenedEvent;
import com.dmdirc.events.eventbus.EventBus;
import com.dmdirc.interfaces.config.IdentityController;
import com.dmdirc.plugins.PluginDomain;
import com.dmdirc.plugins.PluginInfo;
import com.dmdirc.ui.messages.ColourManager;
import com.dmdirc.ui.messages.ColourManagerFactory;
import com.dmdirc.util.validators.NumericalValidator;
import com.dmdirc.util.validators.OptionalValidator;

import java.awt.Window;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.LinkedList;
import java.util.List;
import java.util.Map;
import java.util.Queue;

import javax.inject.Inject;

import net.engio.mbassy.listener.Handler;

/**
 * Class to manage OSD Windows.
 */
public class OsdManager implements CategoryChangeListener, PreferencesInterface,
        SettingChangeListener {

    /** The frame the OSD will be associated with. */
    private final Window mainFrame;
    /** List of OSD Windows. */
    private final List<OsdWindow> windowList = new ArrayList<>();
    /** List of messages to be queued. */
    private final Queue<QueuedMessage> windowQueue = new LinkedList<>();
    /** This plugin's settings domain. */
    private final String domain;
    /** Config OSD Window. */
    private OsdWindow osdWindow;
    /** X-axis position of OSD. */
    private int x;
    /** Y-axis potion of OSD. */
    private int y;
    /** Setting objects with registered change listeners. */
    private PreferencesSetting fontSizeSetting;
    private PreferencesSetting backgroundSetting;
    private PreferencesSetting foregroundSetting;
    private PreferencesSetting widthSetting;
    private PreferencesSetting timeoutSetting;
    private PreferencesSetting maxWindowsSetting;
    /** This plugin's plugin info. */
    private final PluginInfo pluginInfo;
    private final EventBus eventBus;
    /** The controller to read/write settings with. */
    private final IdentityController identityController;
    /** The manager to use to parse colours. */
    private final ColourManager colourManager;

    @Inject
    public OsdManager(
            @MainWindow final Window mainFrame,
            final EventBus eventBus,
            final IdentityController identityController,
            final ColourManagerFactory colourManagerFactory,
            @PluginDomain(OsdPlugin.class) final PluginInfo pluginInfo) {
        this.mainFrame = mainFrame;
        this.eventBus = eventBus;
        this.identityController = identityController;
        this.colourManager = colourManagerFactory.getColourManager(identityController.getGlobalConfiguration());
        this.pluginInfo = pluginInfo;
        this.domain = pluginInfo.getDomain();
    }

    /**
     * Add messages to the queue and call displayWindows.
     *
     * @param timeout Time message will be displayed
     * @param message Message to be displayed.
     */
    public void showWindow(final int timeout, final String message) {
        windowQueue.add(new QueuedMessage(timeout, message));
        displayWindows();
    }

    /**
     * Displays as many windows as appropriate.
     */
    private synchronized void displayWindows() {
        final Integer maxWindows = identityController.getGlobalConfiguration()
                .getOptionInt(domain, "maxWindows", false);

        QueuedMessage nextItem;

        while ((maxWindows == null || getWindowCount() < maxWindows)
                && (nextItem = windowQueue.poll()) != null) {
            displayWindow(nextItem.getTimeout(), nextItem.getMessage());
        }
    }

    /**
     * Create a new OSD window with "message".
     * <p>
     * This method needs to be synchronised to ensure that the window list is not modified in
     * between the invocation of
     * {@link OsdPolicy#getYPosition(OsdManager, int)} and the point at which
     * the {@link OsdWindow} is added to the windowList.
     *
     * @see OsdPolicy#getYPosition(OsdManager, int)
     * @param message Text to display in the OSD window.
     */
    private synchronized void displayWindow(final int timeout, final String message) {
        final OsdPolicy policy = OsdPolicy.valueOf(
                identityController.getGlobalConfiguration().getOption(domain, "newbehaviour")
                        .toUpperCase());
        final int startY = identityController.getGlobalConfiguration()
                .getOptionInt(domain, "locationY");

        windowList.add(UIUtilities.invokeAndWait(() -> new OsdWindow(
                mainFrame,
                identityController, this, colourManager,
                timeout, message, false,
                identityController.getGlobalConfiguration().getOptionInt(
                        domain, "locationX"), policy.getYPosition(this, startY), domain)));
    }

    /**
     * Destroy the given OSD Window and check if the Queue has items, if so Display them.
     *
     * @param window The window that we are destroying.
     */
    public synchronized void closeWindow(final OsdWindow window) {
        final OsdPolicy policy = OsdPolicy.valueOf(
                identityController.getGlobalConfiguration()
                .getOption(domain, "newbehaviour").toUpperCase());

        int oldY = window.getDesiredY();
        final int closedIndex = windowList.indexOf(window);

        if (closedIndex == -1) {
            return;
        }

        windowList.remove(window);

        UIUtilities.invokeLater(window::dispose);

        final List<OsdWindow> newList = getWindowList();
        for (OsdWindow otherWindow : newList.subList(closedIndex, newList.size())) {
            final int currentY = otherWindow.getDesiredY();
            if (policy.changesPosition()) {
                otherWindow.setDesiredLocation(otherWindow.getDesiredX(), oldY);
                oldY = currentY;
            }
        }
        displayWindows();
    }

    /**
     * Destroy all OSD Windows.
     */
    public void closeAll() {
        getWindowList().forEach(this::closeWindow);
    }

    /**
     * Get the list of current OSDWindows.
     *
     * @return a List of all currently open OSDWindows.
     */
    public List<OsdWindow> getWindowList() {
        return new ArrayList<>(windowList);
    }

    /**
     * Get the count of open windows.
     *
     * @return Current number of OSD Windows open.
     */
    public int getWindowCount() {
        return windowList.size();
    }

    @Handler
    public void showConfig(final ClientPrefsOpenedEvent event) {
        final PreferencesDialogModel manager = event.getModel();
        x = identityController.getGlobalConfiguration()
                .getOptionInt(domain, "locationX");
        y = identityController.getGlobalConfiguration()
                .getOptionInt(domain, "locationY");

        final PreferencesCategory category = new PluginPreferencesCategory(
                pluginInfo, "OSD",
                "General configuration for OSD plugin.", "category-osd");

        fontSizeSetting = new PreferencesSetting(PreferencesType.INTEGER,
                domain, "fontSize", "Font size", "Changes the font " + "size of the OSD",
                manager.getConfigManager(),
                manager.getIdentity()).registerChangeListener(this);
        backgroundSetting = new PreferencesSetting(PreferencesType.COLOUR,
                domain, "bgcolour", "Background colour",
                "Background colour for the OSD", manager.getConfigManager(),
                manager.getIdentity()).registerChangeListener(this);
        foregroundSetting = new PreferencesSetting(PreferencesType.COLOUR,
                domain, "fgcolour", "Foreground colour",
                "Foreground colour for the OSD", manager.getConfigManager(),
                manager.getIdentity()).registerChangeListener(this);
        widthSetting = new PreferencesSetting(PreferencesType.INTEGER,
                domain, "width", "OSD Width", "Width of the OSD Window",
                manager.getConfigManager(), manager.getIdentity())
                .registerChangeListener(this);
        timeoutSetting = new PreferencesSetting(PreferencesType.OPTIONALINTEGER,
                new OptionalValidator(new NumericalValidator(1, Integer.MAX_VALUE)),
                domain, "timeout", "Timeout", "Length of time in "
                + "seconds before the OSD window closes", manager.getConfigManager(),
                manager.getIdentity());
        maxWindowsSetting = new PreferencesSetting(PreferencesType.OPTIONALINTEGER,
                new OptionalValidator(new NumericalValidator(1, Integer.MAX_VALUE)),
                domain, "maxWindows", "Maximum open windows",
                "Maximum number of OSD windows that will be displayed at any given time",
                manager.getConfigManager(), manager.getIdentity());

        category.addSetting(fontSizeSetting);
        category.addSetting(backgroundSetting);
        category.addSetting(foregroundSetting);
        category.addSetting(widthSetting);
        category.addSetting(timeoutSetting);
        category.addSetting(maxWindowsSetting);

        final Map<String, String> posOptions = new HashMap<>();

        //Populate policy MULTICHOICE
        for (OsdPolicy policy : OsdPolicy.values()) {
            posOptions.put(policy.name(), policy.getDescription());
        }

        category.addSetting(new PreferencesSetting(domain, "newbehaviour",
                "New window policy", "What to do when an OSD Window "
                + "is opened when there are other, existing windows open",
                posOptions, manager.getConfigManager(), manager.getIdentity()));

        category.addChangeListener(this);
        manager.getCategory("Plugins").addSubCategory(category);
        manager.registerSaveListener(this);
    }

    @Override
    public void categorySelected(final PreferencesCategory category) {
        osdWindow = new OsdWindow(mainFrame, identityController, this, colourManager,
                -1, "Please drag this OSD to position", true, x, y, domain);
        osdWindow.setBackgroundColour(backgroundSetting.getValue());
        osdWindow.setForegroundColour(foregroundSetting.getValue());
        osdWindow.setFontSize(Integer.parseInt(fontSizeSetting.getValue()));
    }

    @Override
    public void categoryDeselected(final PreferencesCategory category) {
        x = osdWindow.getLocationOnScreen().x;
        y = osdWindow.getLocationOnScreen().y;

        osdWindow.dispose();
        osdWindow = null;
    }

    @Override
    public void save() {
        identityController.getUserSettings().setOption(domain, "locationX", x);
        identityController.getUserSettings().setOption(domain, "locationY", y);
    }

    @Override
    public void settingChanged(final PreferencesSetting setting) {
        if (osdWindow == null) {
            // They've changed categories but are somehow poking settings.
            // Ignore the request.
            return;
        }

        if (setting.equals(fontSizeSetting)) {
            osdWindow.setFontSize(Integer.parseInt(setting.getValue()));
        } else if (setting.equals(backgroundSetting)) {
            osdWindow.setBackgroundColour(setting.getValue());
        } else if (setting.equals(foregroundSetting)) {
            osdWindow.setForegroundColour(setting.getValue());
        } else if (setting.equals(widthSetting)) {
            int width = 500;
            try {
                width = Integer.parseInt(setting.getValue());
            } catch (NumberFormatException e) {
                //Ignore
            }
            osdWindow.setSize(width, osdWindow.getHeight());
        }
    }

    public void onLoad() {
        eventBus.subscribe(this);
    }

    public void onUnload() {
        eventBus.unsubscribe(this);
    }
}