import { getLogger } from 'omelox-logger';
import * as utils from '../util/utils';
import { default as events } from '../util/events';
import * as Constants from '../util/constants';
import * as util from 'util';
import { Application } from '../application';
import { IModule, ConsoleService, MonitorAgent, MonitorCallback } from 'omelox-admin';
import { ServerInfo } from '../util/constants';
import * as path from 'path';
let logger = getLogger('omelox', path.basename(__filename));



export class MonitorWatcherModule implements IModule {
    app: Application;
    service: any;
    id: string;

    static moduleId = Constants.KEYWORDS.MONITOR_WATCHER;

    constructor(opts: {app: Application}, consoleService: ConsoleService) {
        this.app = opts.app;
        this.service = consoleService;
        this.id = this.app.getServerId();

        this.app.event.on(events.START_SERVER, finishStart.bind(null, this));
    }

    start(cb: () => void) {
        subscribeRequest(this, this.service.agent, this.id, cb);
    }

    monitorHandler(agent: MonitorAgent, msg: any, cb: MonitorCallback) {
        if (!msg || !msg.action) {
            return;
        }
        let func = (monitorMethods as any)[msg.action];
        if (!func) {
            logger.info('monitorwatcher unknown action: %j', msg.action);
            return;
        }
        func(this, agent, msg, cb);
    }
}

// ----------------- monitor start method -------------------------

let subscribeRequest = function (self: MonitorWatcherModule, agent: MonitorAgent, id: string, cb: MonitorCallback) {
    let msg = { action: 'subscribe', id: id };
    agent.request(Constants.KEYWORDS.MASTER_WATCHER, msg, function (err: Error, servers) {
        if (err) {
            logger.error('subscribeRequest request to master with error: %j', err.stack);
            utils.invokeCallback(cb, err);
        }
        let res = [];
        for (let id in servers) {
            res.push(servers[id]);
        }
        addServers(self, res);
        utils.invokeCallback(cb);
    });
};

// ----------------- monitor request methods -------------------------

let addServer = function (self: MonitorWatcherModule, agent: MonitorAgent, msg: any, cb: MonitorCallback) {
    logger.debug('[%s] receive addServer signal: %j', self.app.serverId, msg);
    if (!msg || !msg.server) {
        logger.warn('monitorwatcher addServer receive empty message: %j', msg);
        utils.invokeCallback(cb, Constants.SIGNAL.FAIL);
        return;
    }
    addServers(self, [msg.server]);
    utils.invokeCallback(cb, Constants.SIGNAL.OK);
};

let removeServer = function  (self: MonitorWatcherModule, agent: MonitorAgent, msg: any, cb: MonitorCallback) {
    logger.debug('%s receive removeServer signal: %j', self.app.serverId, msg);
    if (!msg || !msg.id) {
        logger.warn('monitorwatcher removeServer receive empty message: %j', msg);
        utils.invokeCallback(cb, Constants.SIGNAL.FAIL);
        return;
    }
    removeServers(self, [msg.id]);
    utils.invokeCallback(cb, Constants.SIGNAL.OK);
};

let replaceServer = function (self: MonitorWatcherModule, agent: MonitorAgent, msg: any, cb: MonitorCallback) {
    logger.debug('%s receive replaceServer signal: %j', self.app.serverId, msg);
    if (!msg || !msg.servers) {
        logger.warn('monitorwatcher replaceServer receive empty message: %j', msg);
        utils.invokeCallback(cb, Constants.SIGNAL.FAIL);
        return;
    }
    replaceServers(self, msg.servers);
    utils.invokeCallback(cb, Constants.SIGNAL.OK);
};

let startOver = function (self: MonitorWatcherModule, agent: MonitorAgent, msg: any, cb: MonitorCallback) {

    for(let component of self.app.loaded) {
        let fun = component[Constants.RESERVED.AFTER_STARTALL];
        if (!!fun) {
            fun.call(component);
        }
    }

    for(let lifecycle of self.app.usedPlugins) {
        let fun = lifecycle[Constants.LIFECYCLE.AFTER_STARTALL];
        if (!!fun) {
            fun.call(lifecycle, self.app);
        }
    }

    self.app.event.emit(events.START_ALL);
    utils.invokeCallback(cb, Constants.SIGNAL.OK);
};

// ----------------- common methods -------------------------

let addServers = function (self: MonitorWatcherModule, servers: ServerInfo[]) {
    if (!servers || !servers.length) {
        return;
    }
    self.app.addServers(servers);
};

let removeServers = function (self: MonitorWatcherModule, ids: string[]) {
    if (!ids || !ids.length) {
        return;
    }
    self.app.removeServers(ids);
};

let replaceServers = function (self: MonitorWatcherModule, servers:  {[serverId: string]: ServerInfo}) {
    self.app.replaceServers(servers);
};

// ----------------- bind methods -------------------------

let finishStart = function (self: MonitorWatcherModule, id: string) {
    let msg = { action: 'record', id: id };
    self.service.agent.notify(Constants.KEYWORDS.MASTER_WATCHER, msg);
};

let monitorMethods = {
    'addServer': addServer,
    'removeServer': removeServer,
    'replaceServer': replaceServer,
    'startOver': startOver
};