const fs = require('fs')
const path = require('path')

const inputPath = process.argv[2] || path.join('output', 'tianlan-history-sku-import-scan-full.json')
const outputDir = process.argv[3] || path.join('output')
const baseName = process.argv[4] || 'tianlan-history-sku-import'

function escapeCsvCell(value) {
  const text = String(value ?? '')
  if (/[",\r\n]/.test(text)) {
    return `"${text.replace(/"/g, '""')}"`
  }
  return text
}

function writeCsv(filePath, rows) {
  const headers = [
    'status（状态）',
    'spu（SPU）',
    'store（店铺）',
    'product_category（产品品类）',
    'author（作者）',
    'main_count（主图数量）',
    'sku_count（SKU图数量）',
    'detail_count（详情图数量）',
    'skip_reason（跳过或复核原因）',
    'source_path（来源完整路径）',
    'relative_source_path（来源相对路径）',
  ]
  const lines = [
    headers.join(','),
    ...rows.map((record) =>
      [
        record.status,
        record.spu,
        record.guessedStore,
        record.productCategoryName,
        record.authorName,
        record.mainCount,
        record.skuCount,
        record.detailCount,
        record.skipReason || '',
        record.sourcePath,
        record.relativeSourcePath,
      ]
        .map(escapeCsvCell)
        .join(','),
    ),
  ]
  fs.writeFileSync(filePath, `\uFEFF${lines.join('\r\n')}`, 'utf8')
}

function countBy(records, picker) {
  return records.reduce((acc, record) => {
    const key = picker(record) || '<empty>'
    acc[key] = (acc[key] || 0) + 1
    return acc
  }, {})
}

const records = JSON.parse(fs.readFileSync(inputPath, 'utf8'))
fs.mkdirSync(outputDir, { recursive: true })

writeCsv(path.join(outputDir, `${baseName}-ready.csv`), records.filter((record) => record.status === 'ready'))
writeCsv(path.join(outputDir, `${baseName}-needs-review.csv`), records.filter((record) => record.status === 'needs_review'))
writeCsv(path.join(outputDir, `${baseName}-skipped.csv`), records.filter((record) => record.status === 'skipped'))

const summary = {
  total: records.length,
  status: countBy(records, (record) => record.status),
  store: countBy(records, (record) => record.guessedStore),
  productCategory: countBy(records, (record) => record.productCategoryName),
}

fs.writeFileSync(path.join(outputDir, `${baseName}-summary.json`), JSON.stringify(summary, null, 2), 'utf8')
console.log(JSON.stringify(summary, null, 2))