package com.ts3client.ui;

import com.ts3client.audio.AudioBackend;
import com.ts3client.config.IdentityEntry;
import com.ts3client.config.IdentityStore;
import com.ts3client.config.Settings;
import com.ts3client.net.ChannelNode;
import com.ts3client.net.ClientEntry;
import com.ts3client.net.ConnectionListener;
import com.ts3client.net.TeamspeakConnection;
import com.ts3client.sound.SoundNotifier;
import com.ts3client.text.TsLink;

import javax.swing.JComponent;
import javax.swing.JOptionPane;
import javax.swing.JSplitPane;
import javax.swing.SwingUtilities;
import java.util.ArrayList;
import java.util.List;
import java.awt.Component;

/**
 * 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>Everything that is per-server lives here: the connection, its microphone
 * and speaker mute state, the away/commander flags and the chat history.
 */
final class ServerTab implements ConnectionListener, ServerTreePanel.Actions {

    private final MainFrame host;
    private final Settings settings;
    private final IdentityStore identities;

    private final TeamspeakConnection conn;
    private final GroupIcons groupIcons;
    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;

    /** Label shown in the tab bar: the server name once known, the address before that. */
    private String title = "New connection";
    private String status = "Not connected";
    private volatile boolean connecting;

    /** Identity used for the current connection, so it can be saved into a bookmark. */
    private String identityId = "";

    private boolean micMuted;
    private boolean micLocalMuted;
    private boolean deafened;
    private boolean away;
    /** Away message currently published, empty when away carries no message. */
    private String awayMessage = "";
    private boolean commander;

    private Object currentSelection;

    ServerTab(MainFrame host, Settings settings, IdentityStore identities, AudioBackend audio,
              SoundNotifier sounds) {
        this.host = host;
        this.settings = settings;
        this.identities = identities;
        this.conn = new TeamspeakConnection(settings, audio, this, sounds);
        this.groupIcons = new GroupIcons(conn.getIcons());
        this.treePanel = new ServerTreePanel(conn.getModel(), groupIcons, this);
        this.chatPanel = new ChatPanel();

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

            @Override
            public void onChannelLink(TsLink.Ref ref, Component source, int x, int y) {
                ServerTab.this.onChannelLink(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();

        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;
    }

    TeamspeakConnection connection() {
        return conn;
    }

    ChatPanel chat() {
        return chatPanel;
    }

    String title() {
        return title;
    }

    String status() {
        return status;
    }

    boolean isConnected() {
        return conn.isConnected();
    }

    /** Connected or still connecting — i.e. this tab is not free for a new server. */
    boolean isBusy() {
        return connecting || conn.isConnected();
    }

    String address() {
        return conn.getServerHost();
    }

    int port() {
        return conn.getServerPort();
    }

    String identityId() {
        return identityId;
    }

    boolean isMicMuted() {
        return micMuted;
    }

    boolean isMicLocalMuted() {
        return micLocalMuted;
    }

    boolean isDeafened() {
        return deafened;
    }

    boolean isAway() {
        return away;
    }

    String awayMessage() {
        return awayMessage;
    }

    boolean isCommander() {
        return commander;
    }

    /** What the local client looks like on this server, for the tray icon. */
    SelfState selfState() {
        if (!conn.isConnected()) return SelfState.DISCONNECTED;
        if (deafened) return SelfState.DEAFENED;
        if (micMuted) return SelfState.MIC_MUTED;
        if (micLocalMuted) return SelfState.MIC_LOCAL_MUTED;
        if (away) return SelfState.AWAY;
        ClientEntry self = conn.getModel().getClient(conn.getSelfClientId());
        boolean talking = self != null && self.talking;
        if (commander) return talking ? SelfState.COMMANDER_TALKING : SelfState.COMMANDER;
        return talking ? SelfState.TALKING : SelfState.IDLE;
    }

    /** Path of the channel we are in, or empty when not connected. */
    String currentChannelPath() {
        if (!conn.isConnected()) return "";
        ClientEntry self = conn.getModel().getClient(conn.getSelfClientId());
        return self == null ? "" : conn.getModel().channelPath(self.channelId);
    }

    // ---- connection lifecycle ----

    /**
     * @param identityId      identity to use, or empty for the default one
     * @param channel         channel path to join on connect, or empty for the default channel
     * @param channelPassword password for that channel, if any
     */
    void connect(String address, int port, String nickname, String password, String identityId,
                 String channel, String channelPassword) {
        if (isBusy()) return;
        connecting = true;
        title = address + ":" + port;
        chatPanel.appendSystem("Connecting to " + address + ":" + port
                + (channel == null || channel.isBlank() ? "" : " (channel \"" + channel + "\")") + " …");
        onStatus("Loading identity…");
        host.tabUpdated(this);

        // Resolving may have to generate a first identity, so keep it off the EDT.
        new Thread(() -> {
            final IdentityEntry entry;
            try {
                entry = identities.resolve(settings, identityId);
            } catch (Exception e) {
                connecting = false;
                onError("Could not load identity: " + e.getMessage());
                return;
            }
            SwingUtilities.invokeLater(() -> {
                this.identityId = entry.getId();
                chatPanel.appendSystem("Using identity \"" + entry.getName() + "\".");
            });
            conn.connect(address, port, nickname, password, entry.getIdentity(), channel, channelPassword);
        }, "identity-resolve").start();
    }

    void disconnect() {
        if (conn.isConnected()) conn.disconnect();
    }

    /** Releases the background resources of a tab that is being thrown away. */
    void dispose() {
        conn.getIcons().shutdown();
    }

    /** Synchronous teardown for shutdown paths, so the server sees us leave. */
    void shutdown() {
        if (conn.isConnected()) conn.disconnectBlocking("Leaving");
    }

    // ---- self state ----

    void setMicMuted(boolean muted) {
        micMuted = muted;
        conn.setMicMuted(muted);
    }

    /** TS3's "Local Mic Mute": silences capture without publishing a status change. */
    void setMicLocalMuted(boolean muted) {
        micLocalMuted = muted;
        conn.setMicLocalMuted(muted);
    }

    void setDeafened(boolean deaf) {
        deafened = deaf;
        conn.setDeafened(deaf);
        if (deaf) micMuted = true;
    }

    /** Hands the capture device to (or takes it from) this connection. */
    void setMicrophoneActive(boolean active) {
        conn.setMicrophoneActive(active);
    }

    /**
     * @param message the away message, or null to keep the one already set — the
     *                message outlives coming back, so toggling away again restores it
     */
    void setAway(boolean away, String message) {
        this.away = away;
        if (message != null) this.awayMessage = message;
        conn.setAway(away, awayMessage);
    }

    void setCommander(boolean commander) {
        this.commander = commander;
        conn.setChannelCommander(commander);
    }

    void setNickname(String nickname) {
        if (conn.isConnected()) conn.setNickname(nickname);
    }

    // ---- chat ----

    private void onSendChat(ChatPanel.Target target, int clientId, String text) {
        if (!conn.isConnected()) {
            chatPanel.appendSystem("Not connected.");
            return;
        }
        String me = settings.nickname + " (you)";
        int myId = conn.getSelfClientId();
        switch (target) {
            case SERVER:
                conn.sendServerMessage(text);
                chatPanel.appendServerMessage(myId, me, text);
                break;
            case PRIVATE:
                conn.sendPrivateMessage(clientId, text);
                chatPanel.appendPrivateMessage(clientId, peerName(clientId), myId, me, text);
                break;
            default:
                conn.sendChannelMessage(text);
                chatPanel.appendChannelMessage(myId, me, text);
                break;
        }
    }

    /** A client link in the chat log was clicked: show the same menu as the tree does. */
    private void onClientLink(TsLink.Ref ref, Component source, int x, int y) {
        ClientEntry client = conn.getModel().getClient(ref.id);
        // The id is only valid for the session the link was made in; fall back to
        // the unique id (and finally the nickname) so older links still resolve.
        if (client == null || (!ref.uniqueId.isEmpty() && !ref.uniqueId.equals(client.uniqueId))) {
            ClientEntry byUid = ref.uniqueId.isEmpty() ? null
                    : conn.getModel().findClientByUniqueId(ref.uniqueId);
            if (byUid == null && !ref.name.isEmpty()) byUid = conn.getModel().findClientByName(ref.name);
            if (byUid != null) client = byUid;
        }
        if (client == null) {
            chatPanel.appendSystem("That client is no longer on the server.");
            return;
        }
        ClientMenu.build(client, client.id == conn.getSelfClientId(), this).show(source, x, y);
    }

    private void onChannelLink(TsLink.Ref ref, Component source, int x, int y) {
        ChannelNode channel = conn.getModel().getChannel(ref.id);
        if (channel == null) {
            chatPanel.appendSystem("That channel no longer exists.");
            return;
        }
        ChannelMenu.build(channel, this).show(source, x, y);
    }

    private String peerName(int clientId) {
        ClientEntry c = conn.getModel().getClient(clientId);
        return c != null ? c.nickname : "Client " + clientId;
    }

    /** Joins the channel at a "/"-separated path, as the hotkey action names it. */
    void joinChannelPath(String path) {
        if (!conn.isConnected() || path == null || path.isBlank()) return;
        ChannelNode target = conn.getModel().findChannelByPath(path);
        if (target != null) conn.joinChannel(target.id, null);
    }

    /** Every channel of this server as a "/"-separated path, in the tree's own order. */
    List<String> channelPaths() {
        List<String> out = new ArrayList<>();
        if (!conn.isConnected()) return out;
        for (ChannelNode root : conn.getModel().buildTree()) collectPaths(root, out);
        return out;
    }

    private void collectPaths(ChannelNode channel, List<String> out) {
        out.add(conn.getModel().channelPath(channel.id));
        for (ChannelNode child : channel.children) collectPaths(child, out);
    }

    /** The channel we are in, or null when not connected. */
    ChannelNode currentChannel() {
        if (!conn.isConnected()) return null;
        ClientEntry self = conn.getModel().getClient(conn.getSelfClientId());
        return self == null ? null : conn.getModel().getChannel(self.channelId);
    }

    // ---- ServerTreePanel.Actions ----

    @Override
    public void joinChannel(int channelId) {
        if (conn.isConnected()) conn.joinChannel(channelId, null);
    }

    @Override
    public void moveClientToChannel(ClientEntry client, ChannelNode target) {
        if (!conn.isConnected()) return;
        if (client.id == conn.getSelfClientId()) {
            conn.joinChannel(target.id, null);
        } else {
            conn.moveClient(client.id, target.id, null);
        }
    }

    @Override
    public void moveChannel(ChannelNode channel, int newParentId, int orderPredecessorId) {
        if (conn.isConnected()) conn.moveChannel(channel.id, newParentId, orderPredecessorId);
    }

    @Override
    public void openPrivateChat(ClientEntry client) {
        chatPanel.openPrivateChat(client.id, client.nickname);
    }

    @Override
    public void pokeClient(ClientEntry client) {
        String msg = JOptionPane.showInputDialog(host, "Poke message for " + client.nickname + ":", "Poke!");
        if (msg != null) conn.poke(client.id, msg);
    }

    @Override
    public void kickClientFromChannel(ClientEntry client) {
        String reason = kickReason("Kick Client from Channel", client);
        if (reason != null) conn.kickFromChannel(client.id, reason);
    }

    @Override
    public void kickClientFromServer(ClientEntry client) {
        String reason = kickReason("Kick Client from Server", client);
        if (reason != null) conn.kickFromServer(client.id, reason);
    }

    private String kickReason(String title, ClientEntry client) {
        if (!conn.isConnected()) return null;
        return ReasonDialog.prompt(host, title, "Reason for kicking " + client.nickname + ":",
                ReasonDialog.KICK_REASON_LIMIT);
    }

    @Override
    public void banClient(ClientEntry client) {
        if (!conn.isConnected()) return;
        BanDialog dialog = new BanDialog(host, client.nickname);
        dialog.setVisible(true);
        if (dialog.isConfirmed()) conn.banClient(client.id, dialog.getSeconds(), dialog.getReason());
    }

    @Override
    public void toggleClientMute(ClientEntry client) {
        if (conn.getPlayback() == null) return;
        boolean now = !conn.getPlayback().isClientMuted(client.id);
        conn.getPlayback().setClientMuted(client.id, now);
    }

    @Override
    public void findClientInTree(ClientEntry client) {
        host.selectTab(this);
        treePanel.selectClient(client.id);
    }

    @Override
    public void showConnectionInfo(ClientEntry client) {
        if (!conn.isConnected()) return;
        new ConnectionInfoDialog(host, conn, client.id, client.nickname).setVisible(true);
    }

    @Override
    public void moveClientToOwnChannel(ClientEntry client) {
        if (!conn.isConnected() || client.id == conn.getSelfClientId()) return;
        ClientEntry self = conn.getModel().getClient(conn.getSelfClientId());
        if (self != null) conn.moveClient(client.id, self.channelId, null);
    }

    @Override
    public void setChannelSubscribed(ChannelNode channel, boolean family, boolean subscribed) {
        if (conn.isConnected()) conn.setChannelsSubscribed(channel.familyIds(family), subscribed);
    }

    @Override
    public void browseFiles(ChannelNode channel) {
        if (!conn.canTransferFiles()) return;
        new FileBrowserDialog(host, conn, channel).setVisible(true);
    }

    @Override
    public boolean isClientLocallyMuted(int clientId) {
        return conn.getPlayback() != null && conn.getPlayback().isClientMuted(clientId);
    }

    @Override
    public void onSelectionChanged(Object userObject) {
        currentSelection = userObject;
        renderInfo();
        if (!conn.isConnected()) return;
        if (userObject instanceof ChannelNode) {
            ChannelNode ch = (ChannelNode) userObject;
            if (!ch.descriptionLoaded) conn.requestChannelInfo(ch.id);
        } else if (userObject instanceof ClientEntry) {
            conn.requestClientInfo(((ClientEntry) userObject).id);
        }
    }

    private void renderInfo() {
        Object sel = currentSelection;
        if (sel instanceof ChannelNode) {
            infoPanel.showChannel((ChannelNode) sel);
        } else if (sel instanceof ClientEntry) {
            infoPanel.showClient((ClientEntry) sel, conn.getModel(), conn.getIcons());
        } else {
            infoPanel.clear();
        }
    }

    /** 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();
    }

    // ---- ConnectionListener (marshal to EDT) ----

    @Override
    public void onStatus(String text) {
        SwingUtilities.invokeLater(() -> {
            status = text;
            host.tabUpdated(this);
        });
    }

    @Override
    public void onConnected() {
        SwingUtilities.invokeLater(() -> {
            connecting = false;
            treePanel.setSelfClientId(conn.getSelfClientId());
            micMuted = false;
            micLocalMuted = false;
            deafened = false;
            away = false;
            awayMessage = "";
            commander = false;
            chatPanel.setInputEnabled(true);
            chatPanel.appendSystem("Connected.");
            host.tabConnected(this);
        });
    }

    @Override
    public void onDisconnected(String reason) {
        SwingUtilities.invokeLater(() -> {
            connecting = false;
            conn.getModel().clear();
            treePanel.showDisconnected();
            currentSelection = null;
            infoPanel.clear();
            chatPanel.setInputEnabled(false);
            chatPanel.closePrivateChats();
            chatPanel.closeNoteTabs();
            chatPanel.appendSystem("Disconnected" + (reason == null || reason.isEmpty() ? "." : ": " + reason));
            host.tabDisconnected(this);
        });
    }

    @Override
    public void onModelChanged() {
        SwingUtilities.invokeLater(() -> {
            treePanel.rebuild();
            renderInfo();
            String name = conn.getModel().getServerName();
            if (conn.isConnected() && name != null && !name.isBlank() && !name.equals(title)) {
                title = name;
                host.tabUpdated(this);
            }
        });
    }

    @Override
    public void onInfoUpdated() {
        SwingUtilities.invokeLater(this::renderInfo);
    }

    @Override
    public void onIconsUpdated() {
        SwingUtilities.invokeLater(() -> {
            treePanel.refreshRowSizes();
            renderInfo();
        });
    }

    @Override
    public void onChat(ChatScope scope, int fromClientId, String fromName, String message) {
        switch (scope) {
            case PRIVATE:
                chatPanel.appendPrivateMessage(fromClientId, fromName, fromClientId, fromName, message);
                break;
            case SERVER:
                chatPanel.appendServerMessage(fromClientId, fromName, message);
                break;
            default:
                chatPanel.appendChannelMessage(fromClientId, fromName, message);
                break;
        }
    }

    @Override
    public void onTalkStateChanged(int clientId, boolean talking) {
        SwingUtilities.invokeLater(() -> {
            treePanel.refreshVisual();
            if (clientId == conn.getSelfClientId()) host.selfStateChanged(this);
        });
    }

    @Override
    public void onError(String message) {
        SwingUtilities.invokeLater(() -> {
            chatPanel.appendSystem("Error: " + message);
            status = message;
            host.tabUpdated(this);
        });
    }

    @Override
    public void onServerLog(String message) {
        SwingUtilities.invokeLater(() -> chatPanel.appendServerLog(message));
    }

    @Override
    public void onPoke(String fromName, String message) {
        SwingUtilities.invokeLater(() -> {
            chatPanel.appendSystem("You were poked by " + fromName + ": " + message);
            host.selectTab(this);
            JOptionPane.showMessageDialog(host, fromName + " poked you:\n\n" + message,
                    "Poke", JOptionPane.INFORMATION_MESSAGE);
        });
    }
}