const vscode = require("vscode");

/**
 * @param {vscode.ExtensionContext} context
 */
function activate(context) {
  const disposable = vscode.languages.registerHoverProvider("python", {
    /**
     * @param {vscode.TextDocument} document
     * @param {vscode.Position} position
     * @param {vscode.CancellationToken} token
     */
    async provideHover(document, position, token) {
      const { activeSignature, signatures } =
        await vscode.commands.executeCommand(
          "vscode.executeSignatureHelpProvider",
          document.uri,
          position
        );
      const { label, parameters, activeParameter } =
        signatures[activeSignature];
      const type_name = label
        .substring(...parameters[activeParameter].label)
        .split(":")
        .at(-1)
        .trim();
      const type_list = type_name.split("|").map((x) => x.trim());
      if (!type_list.includes("Res")) return;
      const code_line = document.lineAt(position).text;
      const res_range = document.getWordRangeAtPosition(position, /".*?"/);
      let res = code_line.substring(
        res_range.start.character + 1,
        res_range.end.character - 1
      );
      if (!res.endsWith(".jpg")) res += ".png";
      const img_path = `file://${vscode.workspace.workspaceFolders[0].uri.path}/mower/resources/${res}`;
      const md = new vscode.MarkdownString(`![${res}](${img_path})`);
      return new vscode.Hover(md);
    },
  });

  context.subscriptions.push(disposable);
}

function deactivate() {}

module.exports = {
  activate,
  deactivate,
};