import "react-simple-keyboard/build/css/index.css";
import { ChevronDownIcon } from "@heroicons/react/16/solid";
import { useEffect, useMemo } from "react";
import { useXTerm } from "react-xtermjs";
import { FitAddon } from "@xterm/addon-fit";
import { WebLinksAddon } from "@xterm/addon-web-links";
import { WebglAddon } from "@xterm/addon-webgl";
import { Unicode11Addon } from "@xterm/addon-unicode11";
import { ClipboardAddon } from "@xterm/addon-clipboard";

import { cx } from "@/cva.config";
import { AvailableTerminalTypes, useUiStore } from "@/hooks/stores";

import { Button } from "./Button";

const isWebGl2Supported = !!document.createElement("canvas").getContext("webgl2");

// Terminal theme configuration
const SOLARIZED_THEME = {
  background: "#0f172a", // Solarized base03
  foreground: "#839496", // Solarized base0
  cursor: "#93a1a1", // Solarized base1
  cursorAccent: "#002b36", // Solarized base03
  black: "#073642", // Solarized base02
  red: "#dc322f", // Solarized red
  green: "#859900", // Solarized green
  yellow: "#b58900", // Solarized yellow
  blue: "#268bd2", // Solarized blue
  magenta: "#d33682", // Solarized magenta
  cyan: "#2aa198", // Solarized cyan
  white: "#eee8d5", // Solarized base2
  brightBlack: "#002b36", // Solarized base03
  brightRed: "#cb4b16", // Solarized orange
  brightGreen: "#586e75", // Solarized base01
  brightYellow: "#657b83", // Solarized base00
  brightBlue: "#839496", // Solarized base0
  brightMagenta: "#6c71c4", // Solarized violet
  brightCyan: "#93a1a1", // Solarized base1
  brightWhite: "#fdf6e3", // Solarized base3
} as const;

const TERMINAL_CONFIG = {
  theme: SOLARIZED_THEME,
  fontFamily: "'Fira Code', Menlo, Monaco, 'Courier New', monospace",
  fontSize: 13,
  allowProposedApi: true,
  scrollback: 1000,
  cursorBlink: true,
  smoothScrollDuration: 100,
  macOptionIsMeta: true,
  macOptionClickForcesSelection: true,
  convertEol: true,
  linuxMode: false,
  // Add these configurations:
  cursorStyle: "block",
  rendererType: "canvas", // Ensure we're using the canvas renderer
} as const;

function Terminal({
  title,
  dataChannel,
  type,
}: {
  readonly title: string;
  readonly dataChannel: RTCDataChannel;
  readonly type: AvailableTerminalTypes;
}) {
  const { terminalType, setTerminalType, setDisableVideoFocusTrap } = useUiStore();
  const { instance, ref } = useXTerm({ options: TERMINAL_CONFIG });

  const isTerminalTypeEnabled = useMemo(() => {
    return terminalType == type;
  }, [terminalType, type]);

  useEffect(() => {
    setTimeout(() => {
      setDisableVideoFocusTrap(isTerminalTypeEnabled);
    }, 500);

    return () => {
      setDisableVideoFocusTrap(false);
    };
  }, [setDisableVideoFocusTrap, isTerminalTypeEnabled]);

  const readyState = dataChannel.readyState;
  useEffect(() => {
    if (!instance) return;
    if (readyState !== "open") return;

    const abortController = new AbortController();
    const binaryType = dataChannel.binaryType;
    dataChannel.addEventListener(
      "message",
      e => {
        // Handle binary data differently based on browser implementation
        // Firefox sends data as blobs, chrome sends data as arraybuffer
        if (binaryType === "arraybuffer") {
          instance.write(new Uint8Array(e.data));
        } else if (binaryType === "blob") {
          const reader = new FileReader();
          reader.onload = () => {
            if (!reader.result) return;
            instance.write(new Uint8Array(reader.result as ArrayBuffer));
          };
          reader.readAsArrayBuffer(e.data);
        }
      },
      { signal: abortController.signal },
    );

    const onDataHandler = instance.onData(data => {
      dataChannel.send(data);
    });

    // Setup escape key handler
    const onKeyHandler = instance.onKey(e => {
      const { domEvent } = e;
      if (domEvent.key === "Escape") {
        setTerminalType("none");
        setDisableVideoFocusTrap(false);
        domEvent.preventDefault();
      }
    });

    // Send initial terminal size
    if (dataChannel.readyState === "open") {
      dataChannel.send(JSON.stringify({ rows: instance.rows, cols: instance.cols }));
    }

    return () => {
      abortController.abort();
      onDataHandler.dispose();
      onKeyHandler.dispose();
    };
  }, [dataChannel, instance, readyState, setDisableVideoFocusTrap, setTerminalType]);

  useEffect(() => {
    if (!instance) return;

    // Load the fit addon
    const fitAddon = new FitAddon();
    instance.loadAddon(fitAddon);

    instance.loadAddon(new ClipboardAddon());
    instance.loadAddon(new Unicode11Addon());
    instance.loadAddon(new WebLinksAddon());
    instance.unicode.activeVersion = "11";

    if (isWebGl2Supported) {
      const webGl2Addon = new WebglAddon();
      webGl2Addon.onContextLoss(() => webGl2Addon.dispose());
      instance.loadAddon(webGl2Addon);
    }

    const handleResize = () => fitAddon.fit();

    // Handle resize event
    window.addEventListener("resize", handleResize);
    return () => {
      window.removeEventListener("resize", handleResize);
    };
  }, [instance]);

  return (
    <div
      onKeyDown={e => e.stopPropagation()}
      onKeyUp={e => e.stopPropagation()}
    >
      <div>
        <div
          className={cx(
            [
              // Base styles
              "fixed bottom-0 w-full transform transition duration-500 ease-in-out",
              "-translate-y-[0px]",
            ],
            {
              "pointer-events-none translate-y-[500px] opacity-100 transition duration-300":
                !isTerminalTypeEnabled,
              "pointer-events-auto -translate-y-[0px] opacity-100 transition duration-300":
                isTerminalTypeEnabled,
            },
          )}
        >
          <div className="h-[500px] w-full bg-[#0f172a]">
            <div className="flex items-center justify-center border-y border-y-slate-800/30 bg-white px-2 py-1 dark:border-y-slate-300/20 dark:bg-slate-800">
              <h2 className="select-none self-center font-sans text-[12px] text-slate-700 dark:text-slate-300">
                {title}
              </h2>
              <div className="absolute right-2">
                <Button
                  size="XS"
                  theme="light"
                  text="Hide"
                  LeadingIcon={ChevronDownIcon}
                  onClick={() => setTerminalType("none")}
                />
              </div>
            </div>

            <div className="h-[calc(100%-36px)] p-3">
              <div ref={ref} style={{ height: "100%", width: "100%" }} />
            </div>
          </div>
        </div>
      </div>
    </div>
  );
}

export default Terminal;
