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

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

    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)
                ).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")
                ).then(() => {
                    logger.debug("Notified %s of shutdown", roomId);
                }));
            });
        } else {
            logger.warn("Attempting to send shutdown message while disconnected");
        }
        return Promise.all(promises);
    }
}

function getBuildInfo(buildInfoPath) {
    try {
        return fs.readFileSync(buildInfoPath, "utf8");
    } catch (err) {
        if (err.code === 'ENOENT') {
            return "UNKNOWN_" + utility.toISODateString(new Date());
        } else {
            logger.error("Unexpected Error!", err);
        }
    }
}

function sanitizeConfig(config) {
    let clonedConfig = { ...config };
    clonedConfig.accessToken = "******"
    return clonedConfig;
}

function create(configFile) {
    let config = require(configFile);
    logger.info("Running with config:");
    logger.debug("%o", sanitizeConfig(config));
    let buildInfo = getBuildInfo("../build.info")
    logger.info("Running version: %s", buildInfo);
    return new Bot(config, buildInfo);
}

function init(bot) {
    logger.info("Creating Matrix Client")
    bot.client = sdk.createClient({
        baseUrl: bot.config.baseUrl,
        accessToken: bot.config.accessToken,
        userId: bot.config.userId
    });

    bot.client.on("sync", (state, previousState, data) => {
        switch (state) {
            case "PREPARED":
                bot.connected = true;
                bot.sendStatusStartup();
                break;
        }
    });

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

    /* Capture Exit Conditions */

    ["SIGINT", "SIGTERM"].forEach((signature) => {
        process.on(signature, async () => {
            await bot.sendStatusShutdown()
                .then(() => {
                    logger.info("Gracefully stopping Matrix SDK Client")
                    bot.client.stopClient();
                });
            process.exit(0);
        });
    });

    process.on('exit', () => {
        logger.info("Shutting Down");
    });

    return bot;
}

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

exports.create = create;
exports.init = init;
exports.run = run;