import { readFileSync } from 'node:fs';
import { resolve } from 'node:path';
import { describe, expect, it } from 'vitest';
import { buildSankeyData, parseCsvText, parseXlsxBuffer } from '../src/core';

describe('core parser & sankey', () => {
  it('可以解析 CSV 并生成列名与数据行', () => {
    const table = parseCsvText('A,B,C\n1,2,3\n4,5,6');

    expect(table.headers).toEqual(['A', 'B', 'C']);
    expect(table.rows).toEqual([
      ['1', '2', '3'],
      ['4', '5', '6']
    ]);
  });

  it('支持合并单元格语义向下补全并聚合', () => {
    const table = {
      headers: ['站点', '值', '目标', '模型'],
      rows: [
        ['宁波北欧10', '2582', '嘉兴四级算力池', '小模型'],
        ['宁波北欧12', '2610', '', ''],
        ['宁波鄞中15', '507', '嘉兴四级算力池', '小模型']
      ]
    };

    const result = buildSankeyData(table, {
      sourceDataColumn: 1,
      sourceDescriptionColumns: [0, 1],
      targetDescriptionColumns: [2, 3],
      delimiter: '-'
    });

    expect(result.meta.droppedRows).toBe(0);
    expect(result.links).toHaveLength(3);
    expect(result.links[1].target).toBe('嘉兴四级算力池-小模型');
  });

  it('可以解析 data/example0.xlsx', () => {
    const filePath = resolve(process.cwd(), 'data/example0.xlsx');
    const fileBuffer = readFileSync(filePath);
    const table = parseXlsxBuffer(fileBuffer.buffer.slice(fileBuffer.byteOffset, fileBuffer.byteOffset + fileBuffer.byteLength));

    expect(table.headers.length).toBeGreaterThan(1);
    expect(table.rows.length).toBeGreaterThan(0);
  });
});