import { useMemo } from "react";

const Chunk = ({ chunk, currentTime, onClick, ...props }) => {
  const { text, timestamp } = chunk;
  const [start, end] = timestamp;

  const bolded = start <= currentTime && currentTime < end;

  return (
    <span {...props}>
      {text.startsWith(" ") ? " " : ""}
      <span
        onClick={onClick}
        className="text-md text-gray-600 dark:text-gray-300 cursor-pointer hover:text-red-600"
        title={timestamp.map((x) => x.toFixed(2)).join(" → ")}
        style={{
          textDecoration: bolded ? "underline" : "none",
          textShadow: bolded ? "0 0 1px #000" : "none",
        }}
      >
        {text.trim()}
      </span>
    </span>
  );
};

const Transcript = ({ transcript, currentTime, setCurrentTime, ...props }) => {
  const jsonTranscript = useMemo(() => {
    return (
      JSON.stringify(transcript, null, 2)
        // post-process the JSON to make it more readable
        .replace(/( {4}"timestamp": )\[\s+(\S+)\s+(\S+)\s+\]/gm, "$1[$2 $3]")
    );
  }, [transcript]);

  const downloadTranscript = () => {
    const blob = new Blob([jsonTranscript], { type: "application/json" });
    const url = URL.createObjectURL(blob);
    const a = document.createElement("a");
    a.href = url;
    a.download = "transcript.json";
    a.click();
    URL.revokeObjectURL(url);
  };

  return (
    <>
      <div {...props}>
        {transcript.chunks.map((chunk, i) => (
          <Chunk
            key={i}
            chunk={chunk}
            currentTime={currentTime}
            onClick={(e) => {
              setCurrentTime(chunk.timestamp[0]); // Set to start of chunk
            }}
          />
        ))}
      </div>

      <div className="flex justify-center border-t text-sm text-gray-600 max-h-[150px] overflow-y-auto p-2 scrollbar-thin">
        <button
          className="flex items-center border px-2 py-1 rounded-lg bg-green-400 text-white hover:bg-green-500 cursor-pointer"
          onClick={downloadTranscript}
        >
          <svg
            xmlns="http://www.w3.org/2000/svg"
            fill="none"
            viewBox="0 0 24 24"
            strokeWidth={1.5}
            stroke="currentColor"
            className="size-6 mr-1"
          >
            <path
              strokeLinecap="round"
              strokeLinejoin="round"
              d="M3 16.5v2.25A2.25 2.25 0 0 0 5.25 21h13.5A2.25 2.25 0 0 0 21 18.75V16.5M16.5 12 12 16.5m0 0L7.5 12m4.5 4.5V3"
            />
          </svg>
          Download transcript
        </button>
      </div>
    </>
  );
};
export default Transcript;