import { readFile, writeFile } from 'node:fs/promises'
import { resolve } from 'node:path'

const [inputFile, outputFile] = process.argv.slice(2)

if (!inputFile || !outputFile) {
  throw new Error('用法：node scripts/generate-china-postcode-data.mjs <china_zipcode_adcode.json> <输出文件>')
}

const sourceData = JSON.parse(await readFile(resolve(inputFile), 'utf8'))
const rows = sourceData
  .filter((row) => /^\d{6}$/.test(row.code) && /^\d{6}$/.test(row.zipCode))
  .map((row) => [row.code, row.zipCode])

const source = `// 由 tombcato/china-zipcode-data 的 china_zipcode_adcode.json 生成。\n// 上游项目采用 MIT License：https://github.com/tombcato/china-zipcode-data\nexport type ChinaPostcodeRow = readonly [districtCode: string, postcode: string]\n\nexport const chinaPostcodeRows: readonly ChinaPostcodeRow[] = ${JSON.stringify(rows)} as const\n`

await writeFile(resolve(outputFile), source, 'utf8')