import { isMetaEquivalentKeyPressed } from ".";

// JetBrains IDEs cause odd behavior by overriding certain keybindings, so we simulate the expected behavior here.

export const handleKeyDownJetBrainsMac = (e, text: string, setText) => {
  const isCmdOrCtrlPressed = isMetaEquivalentKeyPressed(e);

  if (isCmdOrCtrlPressed && e.key === "Backspace") {
    e.preventDefault();

    const startPos = e.target.selectionStart;
    const endPos = e.target.selectionEnd;

    if (startPos !== endPos) {
      // If some text is selected, just delete that text
      const newValue = text.slice(0, startPos) + text.slice(endPos);
      setText(newValue);
      // Set the cursor to where the selection started
      e.target.selectionStart = startPos;
      e.target.selectionEnd = startPos;
    } else {
      // Find the start of the current line
      const prevNewLineIndex = text.lastIndexOf("\n", startPos - 1);

      // Delete from the current position to the beginning of the line
      const newValue =
        text.slice(0, prevNewLineIndex + 1) + text.slice(startPos);
      setText(newValue);
      // Set the cursor to the start of the line
      e.target.selectionStart = prevNewLineIndex + 1;
      e.target.selectionEnd = prevNewLineIndex + 1;
    }
  } else if (isCmdOrCtrlPressed) {
    const startPos = e.target.selectionStart;
    const endPos = e.target.selectionEnd;
    let newStartPos = startPos;
    let newEndPos = endPos;
    const isShiftPressed = e.shiftKey;

    if (e.key === "ArrowLeft") {
      const prevNewLineIndex = text.lastIndexOf("\n", startPos - 1);

      newStartPos = prevNewLineIndex === -1 ? 0 : prevNewLineIndex + 1;
      newEndPos = isShiftPressed ? endPos : newStartPos;
    } else if (e.key === "ArrowRight") {
      const nextNewLineIndex = text.indexOf("\n", startPos);

      newEndPos = nextNewLineIndex === -1 ? text.length : nextNewLineIndex;
      newStartPos = isShiftPressed ? newStartPos : newEndPos;
    }

    e.target.selectionStart = newStartPos;
    e.target.selectionEnd = newEndPos;
    e.preventDefault();
  }
};

export const handleKeyDownJetBrains = (e, text: string, setText) => {
  const startPos = e.target.selectionStart;
  const endPos = e.target.selectionEnd;

  const isCtrlPressed = isMetaEquivalentKeyPressed(e);

  if (isCtrlPressed && e.key === "Backspace") {
    e.preventDefault();

    if (startPos !== endPos) {
      // If some text is selected, just delete that text
      const newValue = text.slice(0, startPos) + text.slice(endPos);
      setText(newValue);

      // Set the cursor to where the selection started
      e.target.selectionStart = startPos;
      e.target.selectionEnd = startPos;
    } else {
      // Find the start of the current word
      const prevSpaceIndex = text.slice(0, startPos).trimEnd().lastIndexOf(" ");

      // Delete from the current position to the beginning of the word
      const newValue = text.slice(0, prevSpaceIndex + 1) + text.slice(startPos);
      setText(newValue);

      // Set the cursor to the start of the word
      setTimeout(() => {
        // The browser likes to set the cursor to the end bc setText is delayed, so we wait, imperceptibly
        e.target.selectionStart = prevSpaceIndex + 1;
        e.target.selectionEnd = prevSpaceIndex + 1;
      }, 10);
    }
  } else if (isCtrlPressed && e.key === "c") {
    // If Ctrl+C is pressed, copy the selected text
    e.preventDefault();
    e.stopPropagation();
    if (startPos !== endPos) {
      const selectedText = text.slice(startPos, endPos);
      navigator.clipboard.writeText(selectedText);
    }
  } else if (isCtrlPressed && e.key === "v") {
    // If Ctrl+V is pressed, paste the copied text at the cursor position
    e.preventDefault();
    e.stopPropagation();
    navigator.clipboard.readText().then((clipText) => {
      const newValue = text.slice(0, startPos) + clipText + text.slice(endPos);
      setText(newValue);

      // Set the cursor to the end of the pasted text
      const newCursorPos = startPos + clipText.length;
      setTimeout(() => {
        e.target.selectionStart = newCursorPos;
        e.target.selectionEnd = newCursorPos;
      }, 10);
    });
  }
};