import { injectable } from 'inversify';
import URI from '@theia/core/lib/common/uri';
import { MEMORY_TEXT } from '@theia/search-in-workspace/lib/browser/in-memory-text-resource';
import {
  SearchInWorkspaceFileNode,
  SearchInWorkspaceResultTreeWidget as TheiaSearchInWorkspaceResultTreeWidget,
} from '@theia/search-in-workspace/lib/browser/search-in-workspace-result-tree-widget';

/**
 * Workaround for https://github.com/eclipse-theia/theia/pull/9192/.
 */
@injectable()
export class SearchInWorkspaceResultTreeWidget extends TheiaSearchInWorkspaceResultTreeWidget {
  protected async createReplacePreview(
    node: SearchInWorkspaceFileNode
  ): Promise<URI> {
    const fileUri = new URI(node.fileUri).withScheme('file');
    const openedEditor = this.editorManager.all.find(
      ({ editor }) => editor.uri.toString() === fileUri.toString()
    );
    let content: string;
    if (openedEditor) {
      content = openedEditor.editor.document.getText();
    } else {
      const resource = await this.fileResourceResolver.resolve(fileUri);
      content = await resource.readContents();
    }

    const lines = content.split('\n');
    node.children.map((l) => {
      const leftPositionedNodes = node.children.filter(
        (rl) => rl.line === l.line && rl.character < l.character
      );
      const diff =
        (this._replaceTerm.length - this.searchTerm.length) *
        leftPositionedNodes.length;
      const start = lines[l.line - 1].substr(0, l.character - 1 + diff);
      const end = lines[l.line - 1].substr(l.character - 1 + diff + l.length);
      lines[l.line - 1] = start + this._replaceTerm + end;
    });

    return fileUri.withScheme(MEMORY_TEXT).withQuery(lines.join('\n'));
  }
}