using GLib;
using Gee;

public class Repository : DBusServiceProxy {
    public signal void conversations_updated();
    public signal void messages_updated(string conversation_guid);

    public static Repository get_instance() {
        if (instance == null) {
            instance = new Repository();
        }

        return instance;
    }

    private static Repository instance = null;
    private DBusService.Repository? dbus_repository;
    private uint dbus_watch_id;

    private Repository() {
        this.dbus_watch_id = Bus.watch_name(BusType.SESSION, DBUS_NAME, BusNameWatcherFlags.NONE, (name, name_owner) => {
            connect_to_repository();
        });
    }

    private void connect_to_repository() {
        try {
            this.dbus_repository = Bus.get_proxy_sync<DBusService.Repository>(BusType.SESSION, DBUS_NAME, DBUS_PATH);
            this.dbus_repository.conversations_updated.connect(() => {
                conversations_updated();
            });
            
            this.dbus_repository.messages_updated.connect((conversation_guid) => {
                messages_updated(conversation_guid);
            });

            conversations_updated();
        } catch (GLib.Error e) {
            warning("Failed to connect to repository: %s", e.message);
        }
    }
        
    public Conversation[] get_conversations(int limit = 200) throws DBusServiceProxyError, GLib.Error {
        if (dbus_repository == null) {
            throw new DBusServiceProxyError.NOT_CONNECTED("Repository not connected");
        }

        var conversations = dbus_repository.get_conversations(limit, 0);
        Conversation[] returned_conversations = new Conversation[conversations.length];

        for (int i = 0; i < conversations.length; i++) {
            returned_conversations[i] = new Conversation.from_hash_table(conversations[i]);
        }
        
        return returned_conversations;
    }

    public Message[] get_messages(string conversation_guid, string last_message_id = "") throws DBusServiceProxyError, GLib.Error {
        if (dbus_repository == null) {
            throw new DBusServiceProxyError.NOT_CONNECTED("Repository not connected");
        }
        
        var messages = dbus_repository.get_messages(conversation_guid, last_message_id);
        Message[] returned_messages = new Message[messages.length];

        for (int i = 0; i < messages.length; i++) {
            returned_messages[i] = new Message.from_hash_table(messages[i]);
        }

        return returned_messages;
    }

    public string send_message(string conversation_guid, string message) throws DBusServiceProxyError, GLib.Error {
        if (dbus_repository == null) {
            throw new DBusServiceProxyError.NOT_CONNECTED("Repository not connected");
        }

        return dbus_repository.send_message(conversation_guid, message);
    }

    public void sync_conversation(string conversation_guid) throws DBusServiceProxyError, GLib.Error {
        if (dbus_repository == null) {
            throw new DBusServiceProxyError.NOT_CONNECTED("Repository not connected");
        }

        dbus_repository.sync_conversation(conversation_guid);
    }
}