// SelectionApp.tsx
import React, { useState, useRef } from "react";

interface Span {
  span_text: string;
  start: number;
  end: number;
}

const SelectionApp: React.FC = () => {
  const [spans, setSpans] = useState<Span[]>([]);
  const [keySpan, setKeySpan] = useState<string>("span_text");
  const [keyStart, setKeyStart] = useState<string>("start");
  const [keyEnd, setKeyEnd] = useState<string>("end");
  const [lastText, setLastText] = useState<string>("");

  const inputRef = useRef<HTMLDivElement>(null);

  const getNormalizedText = (container: HTMLElement): string => {
    let html = container.innerHTML;
    html = html.replace(/<div><br><\/div>/gi, '\n');
    html = html.replace(/<div>/gi, '\n').replace(/<\/div>/gi, '');
    html = html.replace(/<br\s*\/?>/gi, '\n');
    html = html.replace(/&nbsp;/g, ' ');
    html = html.replace(/<[^>]+>/g, '');
    return html;
  };

  const getSelectionIndices = () => {
    if (!inputRef.current) return;
    const container = inputRef.current;
    const selection = window.getSelection();
    if (!selection || !selection.rangeCount) return;

    const range = selection.getRangeAt(0);
    if (!container.contains(range.startContainer) || !container.contains(range.endContainer))
      return;

    const selectedText = selection.toString();
    if (!selectedText) return;

    const preRange = range.cloneRange();
    preRange.selectNodeContents(container);
    preRange.setEnd(range.startContainer, range.startOffset);

    const tempDiv = document.createElement("div");
    tempDiv.appendChild(preRange.cloneContents());
    const preText = getNormalizedText(tempDiv);

    const start = preText.length;
    const end = start + selectedText.length;

    const newSpan: Span = { span_text: selectedText, start, end };
    setSpans((prev) => [newSpan, ...prev].slice(0, 5));
  };

  const renderSpans = () => {
    return spans.map((s) => ({
      [keySpan]: s.span_text,
      [keyStart]: s.start,
      [keyEnd]: s.end,
    }));
  };

  const handleInput = (e: React.FormEvent<HTMLDivElement>) => {
    const currentText = getNormalizedText(e.currentTarget);
    if (currentText !== lastText) {
      setSpans([]);
      setLastText(currentText);
    }
  };

  return (
    <div style={{ padding: "20px", fontFamily: "sans-serif" }}>
      <h3>Highlight text to get indices</h3>

      {/* Settings Panel */}
      <div
        style={{
          marginBottom: "15px",
          padding: "10px",
          border: "1px solid #ccc",
          borderRadius: "6px",
          background: "#fafafa",
          width: "90%",
        }}
      >
        <strong>Settings (rename keys):</strong>
        <br />
        <br />
        <label>
          Span Text Key:{" "}
          <input value={keySpan} onChange={(e) => setKeySpan(e.target.value)} />
        </label>
        <label style={{ marginLeft: "10px" }}>
          Start Key:{" "}
          <input value={keyStart} onChange={(e) => setKeyStart(e.target.value)} />
        </label>
        <label style={{ marginLeft: "10px" }}>
          End Key:{" "}
          <input value={keyEnd} onChange={(e) => setKeyEnd(e.target.value)} />
        </label>
      </div>

      {/* Editable Div */}
      <div
        ref={inputRef}
        contentEditable
        onInput={handleInput}
        style={{
          width: "90%",
          minHeight: "150px",
          maxHeight: "400px",
          border: "1px solid #ccc",
          padding: "10px",
          whiteSpace: "pre-wrap",
          overflowWrap: "break-word",
          overflowY: "auto",   // scroll if content exceeds height
          resize: "vertical",  // make resizable vertically
        }}
      >
        Paste or type your text here...
      </div>

      <button
        onClick={getSelectionIndices}
        style={{ marginTop: "10px", padding: "5px 10px" }}
      >
        Get Selection JSON
      </button>

      {/* Display JSON */}
      <pre
        style={{
          marginTop: "15px",
          fontFamily: "monospace",
          background: "#f4f4f4",
          padding: "10px",
          borderRadius: "6px",
          border: "1px solid #ddd",
          whiteSpace: "pre-wrap",
          userSelect: "text",
        }}
      >
        {spans.length ? JSON.stringify(renderSpans(), null, 2) : ""}
      </pre>
    </div>
  );
};

export default SelectionApp;