import { createApp } from "vue";

const utils = {
  updateIcons() {
    lucide.createIcons({
      nameAttr: "icon",
      attrs: {
        width: "1.1em",
        height: "1.1em",
      },
    });
  },
};

const MAX_CHUNK_SIZE = 1024 * 1024; // 1024 KB

const app = createApp({
  data() {
    return {
      peer: null,
      localId: null,
      remoteId: null,
      connection: null, // TODO multiple connections
      data: null, // TODO multiple file
      streamEnqueue: null,
      streamClose: null,
    };
  },
  computed: {},
  watch: {},
  updated() {
    utils.updateIcons();
  },
  beforeMount() {
    this.initApp();
  },
  mounted() {
    setTimeout(this.showApp);
    utils.updateIcons();
  },
  methods: {
    showApp() {
      document.getElementById("app").setAttribute("style", "");
    },
    connect() {
      if (this.remoteId) {
        this.connection = this.peer.connect(this.remoteId);
      }
    },
    initPeer() {
      this.peer = new Peer({
        config: {
          iceServers: [
            { urls: "stun:stun.l.google.com:19302" },
            {
              urls: [`turn:127.0.0.1:3478`, `turns:127.0.0.1:5349`],
              username: "user",
              credential: "pass",
            },
          ],
        },
      });
      this.peer.on("open", this.peerOpen);
      this.peer.on("connection", this.peerConnection);
      this.peer.on("close", this.peerClose);
      this.peer.on("disconnected", this.peerDisconnected);
      this.peer.on("error", this.peerError);
    },
    peerOpen(id) {
      this.localId = id;
    },
    peerConnection(conn) {
      this.connection = conn;
      this.remoteId = conn.peer;
    },
    peerClose() {
      this.peer = null;
      setTimeout(this.initPeer);
    },
    peerDisconnected() {
      this.peer.reconnect();
    },
    peerError(err) {
      // TODO handle error
    },
    connData(data) {
      switch (data.type) {
        case "start":
          ReadableStream({
            start(ctrl) {
              this.streamEnqueue = (chunk) => ctrl.enqueue(chunk);
              this.streamClose = () => ctrl.close();
            },
          });
          break;
        case "chunk":
          if (this.streamEnqueue) {
            this.streamEnqueue(data.bytes);
          }
          break;
        case "end":
          if (this.streamClose) {
            this.streamClose();
          }
          break;
        default:
          break;
      }
    },
    connOpen() {
      // TODO handle conn open
    },
    connClose() {
      this.connection = null;
      // TODO handle conn close
    },
    connError() {
      // TODO handle error
    },
    fileChange(event) {
      console.log(event.target.files[0]);
      const file = event.target.files[0]; // TODO multiple files
      if (!file) {
        return;
      }
      this.data = null;
      const reader = new FileReader();
      reader.onload = () => {
        this.data = reader.result;
      };
      reader.onerror = (err) => {
        console.error(err);
      };
      reader.onloadstart = () => {
        console.log("reading");
      };
      reader.onloadend = () => {
        console.log("read");
      };
      reader.readAsArrayBuffer(file); // TODO check ArrayBuffer.prototype.maxByteLength
    },
    start() {
      this.connection.send({
        type: "start",
      });
      for (
        let index = 0;
        index < this.data.byteLength;
        index += MAX_CHUNK_SIZE
      ) {
        this.connection.send({
          type: "chunk",
          bytes: this.data.slice(
            index * MAX_CHUNK_SIZE,
            Math.min(this.data.byteLength, (index + 1) * MAX_CHUNK_SIZE),
          ),
        });
      }
      this.connection.send({
        type: "end",
      });
    },
    initApp() {
      this.initPeer();
    },
  },
});

window.onload = () => {
  app.mount("#app");
};