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

async function readFile(filePath) {
  try {
    const content = await fs.readFileSync(filePath)
    const json = JSON.parse(content)
    const timeDiff = Math.floor(Date.now() / 1000) - json.lastChecked
    return Object.assign({}, json, { timeDiff })
  } catch (e) {
    console.error(e)
    return {
      error: 'the bridge statistics are not available'
    }
  }
}

function writeFile(filePath, object, useCwd = true) {
  const fullPath = useCwd ? path.join(process.cwd(), filePath) : filePath
  fs.writeFileSync(fullPath, JSON.stringify(object, null, 4))
}

function createDir(dirPath) {
  try {
    fs.mkdirSync(path.join(process.cwd(), dirPath), { recursive: true })
  } catch (e) {
    if (!e.message.includes('exists')) {
      throw e
    }
  }
}

function readCacheFile(filePath) {
  try {
    return JSON.parse(fs.readFileSync(filePath))
  } catch (_) {
    return false
  }
}

function readAccessListFile(filePath) {
  const data = fs.readFileSync(filePath)
  return data
    .toString()
    .split('\n')
    .map(addr => addr.trim().toLowerCase())
    .filter(addr => addr.length === 42)
}

module.exports = {
  readFile,
  writeFile,
  createDir,
  readCacheFile,
  readAccessListFile
}