"use strict";
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.Browser = void 0;
const dns_txt_1 = __importDefault(require("./dns-txt"));
const dns_equal_1 = __importDefault(require("./utils/dns-equal"));
const events_1 = require("events");
const service_types_1 = require("./service-types");
const filter_service_1 = __importDefault(require("./utils/filter-service"));
const filter_txt_1 = __importDefault(require("./utils/filter-txt"));
const equal_txt_1 = __importDefault(require("./utils/equal-txt"));
const TLD = '.local';
const WILDCARD = '_services._dns-sd._udp' + TLD;
class Browser extends events_1.EventEmitter {
    constructor(mdns, opts, onup) {
        super();
        this.onresponse = undefined;
        this.serviceMap = {};
        this.serviceMapTTL = {};
        this.wildcard = false;
        this._services = [];
        if (typeof opts === 'function')
            return new Browser(mdns, null, opts);
        this.mdns = mdns;
        this.txt = new dns_txt_1.default(opts !== null && opts.txt != null ? opts.txt : undefined);
        if (opts === null || opts.type === undefined) {
            this.name = WILDCARD;
            this.wildcard = true;
        }
        else {
            this.name = (0, service_types_1.toString)({ name: opts.type, protocol: opts.protocol || 'tcp' }) + TLD;
            if (opts.name)
                this.name = opts.name + '.' + this.name;
            this.wildcard = false;
        }
        if (opts != null && opts.txt !== undefined)
            this.txtQuery = (0, filter_txt_1.default)(opts.txt);
        if (onup)
            this.on('up', onup);
        this.start();
    }
    start() {
        if (this.onresponse || this.name === undefined)
            return;
        var self = this;
        var nameMap = {};
        if (!this.wildcard)
            nameMap[this.name] = true;
        this.onresponse = (packet, rinfo) => {
            if (self.wildcard) {
                packet.answers.forEach((answer) => {
                    if (answer.type !== 'PTR' || answer.name !== self.name || answer.name in nameMap)
                        return;
                    nameMap[answer.data] = true;
                    self.mdns.query(answer.data, 'PTR');
                });
            }
            Object.keys(nameMap).forEach(function (name) {
                self.goodbyes(name, packet).forEach(self.removeService.bind(self));
                var matches = self.buildServicesFor(name, packet, self.txt, rinfo);
                if (matches.length === 0)
                    return;
                matches.forEach((service) => {
                    if (self.serviceMap[service.fqdn]) {
                        self.updateService(service);
                        return;
                    }
                    self.addService(service);
                });
            });
        };
        this.mdns.on('response', this.onresponse);
        this.update();
    }
    stop() {
        if (!this.onresponse)
            return;
        this.mdns.removeListener('response', this.onresponse);
        this.onresponse = undefined;
    }
    update() {
        this.mdns.query(this.name, 'PTR');
        Object.keys(this.serviceMapTTL).map(fqdn => {
            let now = Date.now();
            if (now > this.serviceMapTTL[fqdn]) {
                this.removeService(fqdn);
            }
        });
    }
    get services() {
        return this._services;
    }
    addService(service) {
        if ((0, filter_service_1.default)(service, this.txtQuery) === false)
            return;
        this._services.push(service);
        this.serviceMap[service.fqdn] = true;
        this.serviceMapTTL[service.fqdn] = Date.now() + service.ttl * 1000;
        this.emit('up', service);
    }
    updateService(service) {
        var _a;
        if (!service)
            return;
        this.serviceMapTTL[service.fqdn] = Date.now() + service.ttl * 1000;
        if ((0, equal_txt_1.default)(service.txt, ((_a = this._services.find((s) => (0, dns_equal_1.default)(s.fqdn, service.fqdn))) === null || _a === void 0 ? void 0 : _a.txt) || {}))
            return;
        if (!(0, filter_service_1.default)(service, this.txtQuery)) {
            this.removeService(service.fqdn);
            return;
        }
        this._services = this._services.map(function (s) {
            if (!(0, dns_equal_1.default)(s.fqdn, service.fqdn))
                return s;
            return service;
        });
        this.emit('txt-update', service);
    }
    removeService(fqdn) {
        var service, index;
        this._services.some(function (s, i) {
            if ((0, dns_equal_1.default)(s.fqdn, fqdn)) {
                service = s;
                index = i;
                return true;
            }
        });
        if (!service || index === undefined)
            return;
        this._services.splice(index, 1);
        delete this.serviceMap[fqdn];
        delete this.serviceMapTTL[fqdn];
        this.emit('down', service);
    }
    goodbyes(name, packet) {
        return packet.answers.concat(packet.additionals)
            .filter((rr) => rr.type === 'PTR' && rr.ttl === 0 && (0, dns_equal_1.default)(rr.name, name))
            .map((rr) => rr.data);
    }
    buildServicesFor(name, packet, txt, referer) {
        var records = packet.answers.concat(packet.additionals).filter((rr) => rr.ttl > 0);
        return records
            .filter((rr) => rr.type === 'PTR' && (0, dns_equal_1.default)(rr.name, name))
            .map((ptr) => {
            const service = {
                addresses: [],
                subtypes: [],
                ttl: ptr.ttl
            };
            records.filter((rr) => {
                return (rr.type === 'PTR' && (0, dns_equal_1.default)(rr.data, ptr.data) && rr.name.includes('._sub'));
            }).forEach((rr) => {
                const types = (0, service_types_1.toType)(rr.name);
                service.subtypes.push(types.subtype);
            });
            records
                .filter((rr) => {
                return (rr.type === 'SRV' || rr.type === 'TXT') && (0, dns_equal_1.default)(rr.name, ptr.data);
            })
                .forEach((rr) => {
                if (rr.type === 'SRV') {
                    var parts = rr.name.split('.');
                    var name = parts[0];
                    var types = (0, service_types_1.toType)(parts.slice(1, -1).join('.'));
                    service.name = name;
                    service.fqdn = rr.name;
                    service.host = rr.data.target;
                    service.referer = referer;
                    service.port = rr.data.port;
                    service.type = types.name;
                    service.protocol = types.protocol;
                }
                else if (rr.type === 'TXT') {
                    service.rawTxt = rr.data;
                    service.txt = this.txt.decodeAll(rr.data);
                }
            });
            if (!service.name)
                return;
            records
                .filter((rr) => (rr.type === 'A' || rr.type === 'AAAA') && (0, dns_equal_1.default)(rr.name, service.host))
                .forEach((rr) => service.addresses.push(rr.data));
            return service;
        })
            .filter((rr) => !!rr);
    }
}
exports.Browser = Browser;
exports.default = Browser;
//# sourceMappingURL=browser.js.map