export class TerminalConsole {
  constructor(t) {
    this.t = t;
    this.term = null;
    this.fitAddon = null;
    this.socket = null;
    this.currentPrompt = "PS>";
    this.commandBuffer = "";
    this.footerStateEl = null;
    this.connectionStateEl = null;
    this.resizeHandler = this.handleResize.bind(this);
  }

  mount() {
    const terminalRoot = document.getElementById("terminal");
    this.footerStateEl = document.getElementById("footerState");
    this.connectionStateEl = document.getElementById("connectionState");

    if (!terminalRoot) {
      return;
    }

    this.term = new Terminal({
      cursorBlink: true,
      fontFamily: 'Consolas, "IBM Plex Mono", monospace',
      fontSize: 15,
      lineHeight: 1.25,
      letterSpacing: 0.2,
      theme: {
        background: "#081426",
        foreground: "#eef5ff",
        cursor: "#7af1d0",
        cursorAccent: "#081426",
        selectionBackground: "rgba(122, 241, 208, 0.18)",
        black: "#081426",
        red: "#ff8d8d",
        green: "#7cf6d1",
        yellow: "#ffd479",
        blue: "#8dbaff",
        magenta: "#d6a4ff",
        cyan: "#73d5ff",
        white: "#eef5ff",
        brightBlack: "#5d718f",
        brightRed: "#ffb0b0",
        brightGreen: "#a2ffe3",
        brightYellow: "#ffe4a6",
        brightBlue: "#b3d1ff",
        brightMagenta: "#e6c1ff",
        brightCyan: "#9be6ff",
        brightWhite: "#ffffff",
      },
    });

    this.fitAddon = new FitAddon.FitAddon();
    this.term.loadAddon(this.fitAddon);
    this.term.open(terminalRoot);
    this.fitAddon.fit();
    this.bindTerminalInput();
    this.setConnectionState("socket.connecting", "status-live");
    this.connect();
    window.addEventListener("resize", this.resizeHandler);
  }

  unmount() {
    window.removeEventListener("resize", this.resizeHandler);

    if (this.socket) {
      this.socket.close();
      this.socket = null;
    }

    if (this.term) {
      this.term.dispose();
      this.term = null;
    }

    this.fitAddon = null;
    this.commandBuffer = "";
    this.currentPrompt = "PS>";
    this.footerStateEl = null;
    this.connectionStateEl = null;
  }

  updateTranslations(t) {
    this.t = t;
    if (this.socket?.readyState === WebSocket.OPEN) {
      this.setConnectionState("socket.connected", "status-ok");
      return;
    }

    this.setConnectionState("socket.connecting", "status-live");
  }

  handleResize() {
    this.fitAddon?.fit();
  }

  bindTerminalInput() {
    this.term.onData((data) => {
      if (!this.socket || this.socket.readyState !== WebSocket.OPEN) {
        return;
      }

      if (data === "\r") {
        const command = this.commandBuffer.trim();
        this.term.write("\r\n");

        if (command === "clear" || command === "cls") {
          this.commandBuffer = "";
          this.term.clear();
          this.writePrompt();
          return;
        }

        this.socket.send(JSON.stringify({
          type: "input",
          data: this.commandBuffer,
        }));
        this.commandBuffer = "";
        return;
      }

      if (data === "\u007f") {
        if (this.commandBuffer.length > 0) {
          this.commandBuffer = this.commandBuffer.slice(0, -1);
          this.term.write("\b \b");
        }
        return;
      }

      if (data === "\u0003") {
        this.commandBuffer = "";
        this.term.write("^C\r\n");
        this.writePrompt();
        return;
      }

      if (data < " ") {
        return;
      }

      this.commandBuffer += data;
      this.term.write(data);
    });
  }

  writePrompt() {
    this.term.write(this.currentPrompt + " ");
  }

  setConnectionState(labelKey, className) {
    const label = this.t(labelKey);
    if (this.connectionStateEl) {
      this.connectionStateEl.textContent = label;
    }
    if (this.footerStateEl) {
      this.footerStateEl.textContent = label;
      this.footerStateEl.className = className;
    }
  }

  connect() {
    const protocol = window.location.protocol === "https:" ? "wss" : "ws";
    this.socket = new WebSocket(protocol + "://" + window.location.host + "/legacy/ws");

    this.socket.addEventListener("open", () => {
      this.setConnectionState("socket.connected", "status-ok");
    });

    this.socket.addEventListener("message", (event) => {
      const message = JSON.parse(event.data);

      if (message.prompt) {
        this.currentPrompt = message.prompt;
      }

      if (message.type === "welcome") {
        this.term.write(message.data || "");
        this.writePrompt();
        return;
      }

      if (message.type === "output") {
        if (message.data) {
          this.term.write(message.data);
        }
        this.writePrompt();
        return;
      }

      if (message.type === "error") {
        this.term.writeln("");
        this.term.writeln(`${this.t("socket.errorPrefix")}: ${message.data || "unknown websocket error"}`);
        this.writePrompt();
      }
    });

    this.socket.addEventListener("close", () => {
      this.setConnectionState("socket.disconnected", "status-bad");
      this.term?.writeln("");
      this.term?.writeln(this.t("socket.closed"));
    });

    this.socket.addEventListener("error", () => {
      this.setConnectionState("socket.error", "status-bad");
    });
  }
}