import { readFileSync } from 'node:fs';
import { fileURLToPath } from 'node:url';
import * as XLSX from 'xlsx';
import { parseWorkbook } from '../src/core/parseWorkbook';
import type { PierInput } from '../src/core/types';

/** Spec workbook (RAG/Pier ui_xxx.xlsx, sheet intent.PR, all tables on one sheet). Used by single-sheet tests. */
const SPEC_PATH = fileURLToPath(new URL('../public/samples/P1.xlsx', import.meta.url));
/** User input (RAG/운곡교P1입력.xlsx, three sheets 교각 · IP · 받침). This is the P1 input used by the app and tests. */
const INPUT_PATH = fileURLToPath(new URL('../public/samples/운곡교P1입력.xlsx', import.meta.url));

export function loadWorkbook(path: string = SPEC_PATH): XLSX.WorkBook {
  return XLSX.read(readFileSync(path), { type: 'buffer' });
}

export function loadInputWorkbook(): XLSX.WorkBook {
  return loadWorkbook(INPUT_PATH);
}

export function loadP1(): PierInput {
  const { piers, issues } = parseWorkbook(loadInputWorkbook());
  if (issues.length) throw new Error(`P1 parse issues: ${JSON.stringify(issues)}`);
  const p1 = piers.find((p) => p.name === 'P1');
  if (!p1) throw new Error('P1 not found');
  return p1;
}