import { forceArgs } from "../cli/forceArgs.ts";
import { cliAlert } from "../cli/prompts.ts";
import { TerminalBlock } from "../cli/TerminalLayout.ts";
import { loadPdfForm } from "util/saveLoadPdf.ts";
import type { ITool } from "../types.ts";

export class ListFormFields implements ITool {
  name = "listformfields";
  description = "Lists fields in a PDF form";
  block?: TerminalBlock;
  async run(pdfPath: string = "") {
    if (!this.block) {
      this.block = new TerminalBlock();
    }
    this.block.setPreserveHistory(true);
    [pdfPath] = await forceArgs([pdfPath], [[
      "Please provide path to PDF:",
      (p) => !!p && p.endsWith(".pdf"),
    ]], this.block);

    const form = await loadPdfForm(pdfPath);
    const fields = form.getFields();
    const fieldNames = fields.map((f) => f.getName());
    const lines = [];
    for (const fieldName of fieldNames) {
      lines.push(fieldName);
    }
    this.block.setLines(lines, [0, 1]);
    await cliAlert("", this.block);
  }
  setBlock(terminalBlock: TerminalBlock) {
    this.block = terminalBlock;
  }
}

export default new ListFormFields();