// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import type * as CodeMirror from '../../../third_party/codemirror.next/codemirror.next.js';

export function toOffset(
    doc: CodeMirror.Text, {lineNumber, columnNumber}: {lineNumber: number, columnNumber: number}): number {
  // DevTools history items are 0-based, but CodeMirror is 1-based, so we have to increment the
  // line we want to scroll to by 1.
  const line = doc.line(Math.max(1, Math.min(doc.lines, lineNumber + 1)));
  return Math.max(line.from, Math.min(line.to, line.from + columnNumber));
}

export function toLineColumn(doc: CodeMirror.Text, offset: number): {lineNumber: number, columnNumber: number} {
  offset = Math.max(0, Math.min(offset, doc.length));
  const line = doc.lineAt(offset);
  return {lineNumber: line.number - 1, columnNumber: offset - line.from};
}