package com.ts3client.ui;

import com.ts3client.audio.AudioBackend;
import com.ts3client.config.BanReasonPresets;
import com.ts3client.config.IdentityStore;
import com.ts3client.config.Settings;
import com.ts3client.contacts.ContactStore;
import com.ts3client.net.ChannelNode;
import com.ts3client.net.ConnectionListener.ChatScope;
import com.ts3client.net.TeamspeakConnection;
import com.ts3client.session.ServerSession;
import com.ts3client.sound.SoundNotifier;
import com.ts3client.text.TsLink;

import javax.swing.JComponent;
import javax.swing.JSplitPane;
import java.awt.Component;
import java.awt.event.ComponentAdapter;
import java.awt.event.ComponentEvent;

/**
 * One server connection and the views bound to it (tree, info and chat). The
 * client keeps several of these side by side; {@link MainFrame} shows one at a
 * time and owns the toolbar, menus and status bar that act on it.
 *
 * <p>The connection and the client's own state on it live in the {@link ServerSession};
 * ServerTab owns the panels, tree context-menu actions and selection live in
 * {@link ServerTabTreeActions}, and session callbacks in {@link ServerTabConnectionEvents}.
 */
final class ServerTab {

    private final MainFrame host;
    private final Settings settings;

    private final ServerSession session;
    private final TeamspeakConnection conn;
    private final GroupIcons groupIcons;
    private final ServerTabTreeActions treeActions;
    private final ServerTreePanel treePanel;
    private final ChatPanel chatPanel;
    private final InfoPanel infoPanel = new InfoPanel();
    private final JComponent component;
    private JSplitPane leftColumn;
    private int normalDividerSize;
    private int savedDividerLocation = -1;
    /** Whether the saved divider share has been applied; before that, layout is not the user's doing. */
    private boolean splitRestored;

    /** The one open ban list window for this server, if any. */
    private BanListDialog banList;

    ServerTab(MainFrame host, Settings settings, IdentityStore identities, AudioBackend audio,
              SoundNotifier sounds, ContactStore contacts) {
        this.host = host;
        this.settings = settings;

        // ServerTabConnectionEvents must exist before the session (which needs a listener
        // up front), and the session must exist before the tree/chat panels and the other
        // tab helpers that read from it — so wiring finishes with an explicit attach() once
        // everything is built. Nothing fires callbacks before then.
        ServerTabConnectionEvents events = new ServerTabConnectionEvents(host, this, settings);
        this.session = new ServerSession(settings, identities, audio, sounds, contacts, events);
        this.conn = session.connection();
        this.groupIcons = new GroupIcons(conn.getIcons());
        this.chatPanel = new ChatPanel();
        this.treeActions = new ServerTabTreeActions(host, this, conn, chatPanel, infoPanel, groupIcons);
        this.treePanel = new ServerTreePanel(conn.getModel(), groupIcons, contacts, settings, treeActions);
        treeActions.attach(treePanel);
        events.attach(session, treePanel, chatPanel, treeActions);

        chatPanel.setSendHandler(this::onSendChat);
        chatPanel.setLinkHandler(new ChatPanel.LinkHandler() {
            @Override
            public void onClientLink(TsLink.Ref ref, Component source, int x, int y) {
                treeActions.handleClientLink(ref, source, x, y);
            }

            @Override
            public void onChannelLink(TsLink.Ref ref, Component source, int x, int y) {
                treeActions.handleChannelLink(ref, source, x, y);
            }
        });
        chatPanel.setInputEnabled(false);

        infoPanel.setDescriptionHandler(new InfoPanel.DescriptionHandler() {
            @Override
            public void showInfoTab(String html, Runnable onClose) {
                chatPanel.openDescriptionTab("info", Icons.channelClientPair(), "", html, onClose);
            }

            @Override
            public void closeInfoTab() {
                chatPanel.closeNoteTab("info");
            }

            @Override
            public void setPanelHidden(boolean hidden) {
                ServerTab.this.setInfoPanelHidden(hidden);
            }
        });

        leftColumn = new JSplitPane(JSplitPane.VERTICAL_SPLIT, treePanel, infoPanel);
        leftColumn.setResizeWeight(0.68);
        leftColumn.setContinuousLayout(true);
        normalDividerSize = leftColumn.getDividerSize();
        // The info panel keeps the height the user gave it, in this tab and the next session.
        leftColumn.addComponentListener(new ComponentAdapter() {
            @Override
            public void componentResized(ComponentEvent e) {
                if (splitRestored) return;
                splitRestored = true;
                leftColumn.setDividerLocation(settings.infoSplitRatio);
            }
        });
        leftColumn.addPropertyChangeListener(JSplitPane.DIVIDER_LOCATION_PROPERTY, e -> rememberSplit());

        JSplitPane split = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT, leftColumn, chatPanel);
        split.setResizeWeight(0.55);
        split.setDividerLocation(400);
        split.setContinuousLayout(true);
        this.component = split;
    }

    // ---- accessors ----

    JComponent component() {
        return component;
    }

    ServerSession session() {
        return session;
    }

    TeamspeakConnection connection() {
        return conn;
    }

    ChatPanel chat() {
        return chatPanel;
    }

    /** Opens the server's ban list, or brings the already open one forward. */
    void showBanList(BanReasonPresets presets) {
        if (!session.isConnected()) return;
        if (banList == null || !banList.isDisplayable()) {
            banList = new BanListDialog(host, conn, settings, presets);
        }
        banList.setVisible(true);
        banList.toFront();
    }

    /** The server's name changed or the connection went; the ban list window follows. */
    void banListServerChanged(boolean connected) {
        if (banList == null) return;
        if (connected) banList.serverNameChanged();
        else banList.connectionLost();
    }

    /** The contact list changed: names, colours and per-client playback follow. */
    void contactsChanged() {
        conn.applyContacts();
        treePanel.refreshRowSizes();
        treeActions.renderInfo();
    }

    // ---- dialogs ----

    void showAvatarDialog() {
        if (conn.isConnected()) new AvatarDialog(host, conn).setVisible(true);
    }

    // ---- chat ----

    private void onSendChat(ChatPanel.Target target, int clientId, String text) {
        ChatScope scope = switch (target) {
            case SERVER -> ChatScope.SERVER;
            case PRIVATE -> ChatScope.PRIVATE;
            default -> ChatScope.CHANNEL;
        };
        session.sendChat(scope, clientId, text);
    }

    /** Opens the file repository browser for a channel, as the "Browse Files" hotkey/menu action does. */
    void browseFiles(ChannelNode channel) {
        treeActions.browseFiles(channel);
    }

    /**
     * Records where the user put the divider, as a share of the column. Collapsed and
     * pre-layout positions are not the user's choice, so they are left out.
     */
    private void rememberSplit() {
        if (!splitRestored || !infoPanel.isVisible()) return;
        int span = leftColumn.getHeight() - leftColumn.getDividerSize();
        if (span <= 0) return;
        double ratio = leftColumn.getDividerLocation() / (double) span;
        if (ratio <= 0.05 || ratio >= 0.98) return;
        settings.infoSplitRatio = ratio;
    }

    /** Collapses the info panel to nothing while its content lives in the chat tab, or restores it. */
    private void setInfoPanelHidden(boolean hidden) {
        if (hidden == !infoPanel.isVisible()) return;
        if (hidden) {
            savedDividerLocation = leftColumn.getDividerLocation();
            infoPanel.setVisible(false);
            leftColumn.setDividerSize(0);
            leftColumn.setDividerLocation(1.0);
        } else {
            infoPanel.setVisible(true);
            leftColumn.setDividerSize(normalDividerSize);
            if (savedDividerLocation >= 0) leftColumn.setDividerLocation(savedDividerLocation);
        }
        leftColumn.revalidate();
    }
}