let sdk = require('matrix-js-sdk');
let message = require('./message');
let utility = require('./utility');
let { logger } = require('./logging');

class Bot {
    constructor(config, buildInfo) {
        this.config = config;
        this.buildInfo = buildInfo;
        this.connected = false;
    }

    /**
     * Initialize the bot connection
     */
    init(messageCallback) {
        logger.info("Creating Matrix Client")
        this.client = sdk.createClient({
            baseUrl: this.config.baseUrl,
            accessToken: this.config.accessToken,
            userId: this.config.userId
        });

        this.client.on("sync", async (state, previousState, data) => {
            switch (state) {
                case "PREPARED":
                    this.connected = true;
                    await this.sendStatusStartup();
                    this.client.getJoinedRooms()
                        .done((rooms) => {
                            logger.info("Connected to: %o", rooms)
                        });
                    break;
                case "SYNCING":
                    logger.debug("Syncing")
                    break;
                case "RECONNECTING":
                    logger.debug("Reconnecting");
                    break;
                default:
                    logger.error("Unexpected sync state: %s", state);
                    process.exit(1);
            }
        });

        this.client.on("RoomMember.membership", (event, member) => {
            if (member.membership === "invite"
                && this.config.admin.indexOf(ember.userId) >= 0) {
                this.client.joinRoom(member.roomId).done(() => {
                    logger.info("Auto-joined %s", member.roomId);
                });
            }
        });

        this.client.on("Room.timeline", messageCallback);

        return this;
    }

    async connect() {
        // logger.info("Initializing Crypto");
        // await bot.client.initCrypto();
        logger.info("Starting Matrix SDK Client");
        await this.client.startClient();
    }

    sendStatusStartup() {
        let promises = [Promise.resolve(true)]
        if (this.connected) {
            this.config.statusRooms.forEach(roomId => {
                logger.debug("Notifying %s of startup", roomId);
                promises.push(this.client.sendMessage(
                    roomId, message.createBasic("Started with version: " + this.buildInfo, message.types.NOTICE)
                ).then(() => {
                    logger.debug("Notified %s of startup", roomId);
                }));
            });
        } else {
            logger.warn("Attempting to send startup message while disconnected");
        }
        return Promise.all(promises);
    }

    sendStatusShutdown() {
        let promises = [Promise.resolve(true)]
        if (this.connected) {
            this.config.statusRooms.forEach(roomId => {
                logger.debug("Notifying %s of shutdown", roomId);
                promises.push(this.client.sendMessage(
                    roomId, message.createBasic("Shutting down", message.types.NOTICE)
                ).then(() => {
                    logger.debug("Notified %s of shutdown", roomId);
                }));
            });
        } else {
            logger.warn("Attempting to send shutdown message while disconnected");
        }
        return Promise.all(promises);
    }
}

function create(config) {
    let buildInfo = utility.getBuildInfo();
    logger.info("Running version: %s", buildInfo);
    return new Bot(config, buildInfo);
}

exports.create = create;