import debug from "debug";
import { html, LitElement } from "lit";
import { customElement, property } from "lit/decorators.js";
import { NamedNode } from "n3";
import ReconnectingWebSocket from "reconnectingwebsocket";
import { sortBy, uniq } from "underscore";
import { Patch } from "../patch";
import { getTopGraph } from "../RdfdbSyncedGraph";
import { SyncedGraph } from "../SyncedGraph";
import { Light9CollectorDevice } from "./Light9CollectorDevice";
export { RdfdbSyncedGraph } from "../RdfdbSyncedGraph";
export { Light9CollectorDevice };

debug.enable("*");
const log = debug("collector");

@customElement("light9-collector-ui")
export class Light9CollectorUi extends LitElement {
  graph!: SyncedGraph;
  render() {
    return html`<rdfdb-synced-graph></rdfdb-synced-graph>
      <h1>Collector</h1>

      <h2>Devices</h2>
      <div style="column-width: 11em">${this.devices.map((d) => html`<light9-collector-device .uri=${d}></light9-collector-device>`)}</div> `;
  }

  @property() devices: NamedNode[] = [];

  constructor() {
    super();
    getTopGraph().then((g) => {
      this.graph = g;
      this.graph.runHandler(this.findDevices.bind(this), "findDevices");
    });

    const ws = new ReconnectingWebSocket(location.href.replace("http", "ws") + "../service/collector/updates");
    ws.addEventListener("message", (ev: any) => {
      const outputAttrsSet = JSON.parse(ev.data).outputAttrsSet;
      if (outputAttrsSet) {
        this.updateDev(outputAttrsSet.dev, outputAttrsSet.attrs);
      }
    });
  }

  findDevices(patch?: Patch) {
    const U = this.graph.U();

    this.devices = [];
    this.clearDeviceChildElementCache();
    let classes = this.graph.subjects(U("rdf:type"), U(":DeviceClass"));
    uniq(sortBy(classes, "value"), true).forEach((dc) => {
      sortBy(this.graph.subjects(U("rdf:type"), dc), "value").forEach((dev) => {
        this.devices.push(dev as NamedNode);
      });
    });
  }

  deviceElements: Map<string, Light9CollectorDevice> = new Map();

  clearDeviceChildElementCache() {
    this.deviceElements = new Map();
  }

  findDeviceChildElement(uri: string): Light9CollectorDevice | undefined {
    const known = this.deviceElements.get(uri);
    if (known) {
      return known;
    }

    for (const el of this.shadowRoot!.querySelectorAll("light9-collector-device")) {
      const eld = el as Light9CollectorDevice;
      if (eld.uri.value == uri) {
        this.deviceElements.set(uri, eld);
        return eld;
      }
    }

    return undefined;
  }

  updateDev(uri: string, attrs: { attr: string; chan: string; val: string; valClass: string }[]) {
    const el = this.findDeviceChildElement(uri);
    if (!el) {
      // unresolved race: updates come in before we have device elements to display them
      setTimeout(() => this.updateDev(uri, attrs), 300);
      return;
    }
    el.setAttrs(attrs);
  }
}