"use strict";
var __awaiter = (this && this.__awaiter) || function (thisArg, _arguments, P, generator) {
    return new (P || (P = Promise))(function (resolve, reject) {
        function fulfilled(value) { try { step(generator.next(value)); } catch (e) { reject(e); } }
        function rejected(value) { try { step(generator["throw"](value)); } catch (e) { reject(e); } }
        function step(result) { result.done ? resolve(result.value) : new P(function (resolve) { resolve(result.value); }).then(fulfilled, rejected); }
        step((generator = generator.apply(thisArg, _arguments || [])).next());
    });
};
var __generator = (this && this.__generator) || function (thisArg, body) {
    var _ = { label: 0, sent: function() { if (t[0] & 1) throw t[1]; return t[1]; }, trys: [], ops: [] }, f, y, t, g;
    return g = { next: verb(0), "throw": verb(1), "return": verb(2) }, typeof Symbol === "function" && (g[Symbol.iterator] = function() { return this; }), g;
    function verb(n) { return function (v) { return step([n, v]); }; }
    function step(op) {
        if (f) throw new TypeError("Generator is already executing.");
        while (_) try {
            if (f = 1, y && (t = op[0] & 2 ? y["return"] : op[0] ? y["throw"] || ((t = y["return"]) && t.call(y), 0) : y.next) && !(t = t.call(y, op[1])).done) return t;
            if (y = 0, t) op = [op[0] & 2, t.value];
            switch (op[0]) {
                case 0: case 1: t = op; break;
                case 4: _.label++; return { value: op[1], done: false };
                case 5: _.label++; y = op[1]; op = [0]; continue;
                case 7: op = _.ops.pop(); _.trys.pop(); continue;
                default:
                    if (!(t = _.trys, t = t.length > 0 && t[t.length - 1]) && (op[0] === 6 || op[0] === 2)) { _ = 0; continue; }
                    if (op[0] === 3 && (!t || (op[1] > t[0] && op[1] < t[3]))) { _.label = op[1]; break; }
                    if (op[0] === 6 && _.label < t[1]) { _.label = t[1]; t = op; break; }
                    if (t && _.label < t[2]) { _.label = t[2]; _.ops.push(op); break; }
                    if (t[2]) _.ops.pop();
                    _.trys.pop(); continue;
            }
            op = body.call(thisArg, _);
        } catch (e) { op = [6, e]; y = 0; } finally { f = t = 0; }
        if (op[0] & 5) throw op[1]; return { value: op[0] ? op[1] : void 0, done: true };
    }
};
Object.defineProperty(exports, "__esModule", { value: true });
var rxjs_1 = require("rxjs");
var operators_1 = require("rxjs/operators");
var iotize_device_1 = require("../device/iotize-device");
var logger_1 = require("../logger");
exports.DEFAULT_KEEP_ALIVE_PERIOD_MS = 5000;
var logger = logger_1.default('KeepAliveEngine');
Object.defineProperty(iotize_device_1.IoTizeDevice.prototype, "keepAlive", {
    get: function () {
        if (!this._keepAliveTask) {
            logger.debug("Create keep alive engine");
            this._keepAliveTask = new KeepAliveEngine(this, {
                period: exports.DEFAULT_KEEP_ALIVE_PERIOD_MS
            });
        }
        return this._keepAliveTask;
    },
    enumerable: false,
    configurable: true
});
// IoTizeDevice.prototype.keepAlive = function (this: IoTizeDevice, enabled: boolean, options?: KeepAliveOptions): Observable<KeepAliveEvent> {
//     return this._keepAliveTask.events;
// }
iotize_device_1.IoTizeDevice.prototype.setupKeepAliveFromConfig = function () {
    return __awaiter(this, void 0, void 0, function () {
        var periodInSeconds;
        return __generator(this, function (_a) {
            switch (_a.label) {
                case 0: return [4 /*yield*/, this.service.interface.getHostInactivityPeriod()];
                case 1:
                    periodInSeconds = (_a.sent()).body();
                    this.keepAlive.options.period = periodInSeconds * 1000;
                    this.keepAlive.start();
                    return [2 /*return*/];
            }
        });
    });
};
var KeepAliveEngine = /** @class */ (function () {
    function KeepAliveEngine(tap, options) {
        var _this = this;
        this.tap = tap;
        this.options = options;
        this._lastResponseTime = 0;
        this._isStopped = true;
        this._events = new rxjs_1.Subject();
        logger.debug('new KeepAliveEngine()');
        this.tap.client.addInterceptor(function (req, handle) {
            return handle.handle(req)
                .pipe(operators_1.tap({
                next: function () {
                    logger.debug('update last response time', _this._lastResponseTime, '=>', new Date().getTime());
                    _this._lastResponseTime = new Date().getTime();
                }
            }));
        });
    }
    Object.defineProperty(KeepAliveEngine.prototype, "events", {
        get: function () {
            return this._events.asObservable();
        },
        enumerable: true,
        configurable: true
    });
    Object.defineProperty(KeepAliveEngine.prototype, "running", {
        get: function () {
            return !this._isStopped;
        },
        enumerable: true,
        configurable: true
    });
    KeepAliveEngine.prototype.start = function () {
        this._isStopped = false;
        if (!this.timeoutId) {
            this._setupNextTimeout(0);
        }
        this._events.next({
            type: 'start'
        });
    };
    KeepAliveEngine.prototype.stop = function () {
        this._isStopped = true;
        if (this.timeoutId) {
            clearTimeout(this.timeoutId);
            this.timeoutId = undefined;
        }
        this._events.next({
            type: 'stop'
        });
    };
    KeepAliveEngine.prototype._setupNextTimeout = function (timeoutMs) {
        var _this = this;
        if (this._isStopped) {
            return;
        }
        this._events.next({
            type: 'rescheduleKeepAlive',
            timeout: timeoutMs
        });
        this.timeoutId = setTimeout(function () { return __awaiter(_this, void 0, void 0, function () {
            var remainingTime, err_1;
            return __generator(this, function (_a) {
                switch (_a.label) {
                    case 0:
                        if (!this.tap.isConnected()) return [3 /*break*/, 6];
                        remainingTime = this.options.period - elapsedTime(this._lastResponseTime);
                        if (!(remainingTime > 0)) return [3 /*break*/, 1];
                        logger.debug('Reschedule keep alive in ', remainingTime);
                        this._setupNextTimeout(remainingTime);
                        return [3 /*break*/, 6];
                    case 1:
                        logger.debug('Running keep alive');
                        _a.label = 2;
                    case 2:
                        _a.trys.push([2, 4, , 5]);
                        this._events.next({
                            type: 'tick'
                        });
                        return [4 /*yield*/, this.tap.service.interface.keepAlive()];
                    case 3:
                        _a.sent();
                        return [3 /*break*/, 5];
                    case 4:
                        err_1 = _a.sent();
                        this._events.next({
                            type: 'error',
                            error: err_1
                        });
                        return [3 /*break*/, 5];
                    case 5:
                        this._setupNextTimeout(this.options.period);
                        _a.label = 6;
                    case 6: return [2 /*return*/];
                }
            });
        }); }, timeoutMs);
    };
    return KeepAliveEngine;
}());
exports.KeepAliveEngine = KeepAliveEngine;
function elapsedTime(time) {
    return new Date().getTime() - time;
}
