// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

Sources.GoToLineQuickOpen = class extends QuickOpen.FilteredListWidget.Provider {
  /**
   * @override
   * @param {?number} itemIndex
   * @param {string} promptValue
   */
  selectItem(itemIndex, promptValue) {
    const uiSourceCode = this._currentUISourceCode();
    if (!uiSourceCode) {
      return;
    }
    const position = this._parsePosition(promptValue);
    if (!position) {
      return;
    }
    Common.Revealer.reveal(uiSourceCode.uiLocation(position.line - 1, position.column - 1));
  }

  /**
   * @override
   * @param {string} query
   * @return {string}
   */
  notFoundText(query) {
    if (!this._currentUISourceCode()) {
      return Common.UIString('No file selected.');
    }
    const position = this._parsePosition(query);
    if (!position) {
      const sourceFrame = this._currentSourceFrame();
      if (!sourceFrame) {
        return ls`Type a number to go to that line.`;
      }
      const currentLineNumber = sourceFrame.textEditor.currentLineNumber() + 1;
      const linesCount = sourceFrame.textEditor.linesCount;
      return ls`Current line: ${currentLineNumber}. Type a line number between 1 and ${linesCount} to navigate to.`;
    }
    if (position.column && position.column > 1) {
      return ls`Go to line ${position.line} and column ${position.column}.`;
    }
    return ls`Go to line ${position.line}.`;
  }

  /**
   * @param {string} query
   * @return {?{line: number, column: number}}
   */
  _parsePosition(query) {
    const parts = query.match(/([0-9]+)(\:[0-9]*)?/);
    if (!parts || !parts[0] || parts[0].length !== query.length) {
      return null;
    }
    const line = parseInt(parts[1], 10);
    let column;
    if (parts[2]) {
      column = parseInt(parts[2].substring(1), 10);
    }
    return {line: Math.max(line | 0, 1), column: Math.max(column | 0, 1)};
  }

  /**
   * @return {?Workspace.UISourceCode}
   */
  _currentUISourceCode() {
    const sourcesView = UI.context.flavor(Sources.SourcesView);
    if (!sourcesView) {
      return null;
    }
    return sourcesView.currentUISourceCode();
  }

  /**
   * @return {?Sources.UISourceCodeFrame}
   */
  _currentSourceFrame() {
    const sourcesView = UI.context.flavor(Sources.SourcesView);
    if (!sourcesView) {
      return null;
    }
    return sourcesView.currentSourceFrame();
  }
};