import { readFileSync } from 'node:fs';
import { resolve } from 'node:path';
import { describe, expect, it } from 'vitest';
import * as XLSX from 'xlsx';
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);
  });

  it('xlsx !ref 范围虚高时，不应错误膨胀行列数量', () => {
    const sheet = XLSX.utils.aoa_to_sheet([
      ['source', 'target', 'value'],
      ['A', 'B', 1]
    ]);
    sheet['!ref'] = 'A1:H20';
    const workbook = XLSX.utils.book_new();
    XLSX.utils.book_append_sheet(workbook, sheet, 'S1');
    const buffer = XLSX.write(workbook, { bookType: 'xlsx', type: 'buffer' });
    const table = parseXlsxBuffer(
      buffer.buffer.slice(buffer.byteOffset, buffer.byteOffset + buffer.byteLength)
    );

    expect(table.headers).toEqual(['source', 'target', 'value']);
    expect(table.rows).toEqual([['A', 'B', '1']]);
  });

  it('xlsx 中 0 值应被正确保留', () => {
    const sheet = XLSX.utils.aoa_to_sheet([
      ['source', 'target', 'value'],
      ['A', 'B', 0]
    ]);
    const workbook = XLSX.utils.book_new();
    XLSX.utils.book_append_sheet(workbook, sheet, 'S1');
    const buffer = XLSX.write(workbook, { bookType: 'xlsx', type: 'buffer' });
    const table = parseXlsxBuffer(
      buffer.buffer.slice(buffer.byteOffset, buffer.byteOffset + buffer.byteLength)
    );

    expect(table.rows).toEqual([['A', 'B', '0']]);
  });

  it('xlsx 中常见中文乱码应尝试自动恢复', () => {
    const sheet = XLSX.utils.aoa_to_sheet([['人數'], ['张三']]);
    const workbook = XLSX.utils.book_new();
    XLSX.utils.book_append_sheet(workbook, sheet, 'S1');
    const buffer = XLSX.write(workbook, { bookType: 'xlsx', type: 'buffer' });
    const table = parseXlsxBuffer(
      buffer.buffer.slice(buffer.byteOffset, buffer.byteOffset + buffer.byteLength)
    );

    expect(table.headers).toEqual(['人數']);
    expect(table.rows).toEqual([['张三']]);
  });

  it('源数据非法时，告警包含单元格内容和位置', () => {
    const table = {
      headers: ['source', 'value', 'target'],
      rows: [['A', 'abc', 'T1']]
    };

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

    expect(result.meta.droppedRows).toBe(1);
    expect(result.meta.warnings[0]).toContain('第 2 行');
    expect(result.meta.warnings[0]).toContain('第 2 列');
    expect(result.meta.warnings[0]).toContain('value');
    expect(result.meta.warnings[0]).toContain('abc');
  });

  it('源描述为空时，告警包含描述字段内容和位置', () => {
    const table = {
      headers: ['source', 'value', 'target'],
      rows: [['', '12', 'T1']]
    };

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

    expect(result.meta.droppedRows).toBe(1);
    expect(result.meta.warnings[0]).toContain('源描述为空');
    expect(result.meta.warnings[0]).toContain('第 1 列');
    expect(result.meta.warnings[0]).toContain('source');
    expect(result.meta.warnings[0]).toContain('(空)');
  });

  it('目标描述为空时，告警包含描述字段内容和位置', () => {
    const table = {
      headers: ['source', 'value', 'target'],
      rows: [['S1', '12', '']]
    };

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

    expect(result.meta.droppedRows).toBe(1);
    expect(result.meta.warnings[0]).toContain('目标描述为空');
    expect(result.meta.warnings[0]).toContain('第 3 列');
    expect(result.meta.warnings[0]).toContain('target');
    expect(result.meta.warnings[0]).toContain('(空)');
    expect(result.meta.warnings[0]).toContain('无可继承的上方值');
  });
});