const stat = require('./stat')
const Fuse = require('../../')

module.exports = function (tests = {}) {
  return {
    readdir: function (path, cb) {
      if (tests.readdir) tests.readdir(path)
      if (path === '/') return process.nextTick(cb, null, ['test'])
      return process.nextTick(cb, Fuse.ENOENT)
    },
    getattr: function (path, cb) {
      if (tests.getattr) tests.getattr(path)
      if (path === '/') return process.nextTick(cb, null, stat({ mode: 'dir', size: 4096 }))
      if (path === '/test') return process.nextTick(cb, null, stat({ mode: 'file', size: 11 }))
      return process.nextTick(cb, Fuse.ENOENT)
    },
    open: function (path, flags, cb) {
      if (tests.open) tests.open(path, flags)
      return process.nextTick(cb, 0, 42)
    },
    release: function (path, fd, cb) {
      if (tests.release) tests.release(path, fd)
      return process.nextTick(cb, 0)
    },
    read: function (path, fd, buf, len, pos, cb) {
      if (tests.read) tests.read(path, fd, buf, len, pos)
      var str = 'hello world'.slice(pos, pos + len)
      if (!str) return process.nextTick(cb, 0)
      buf.write(str)
      return process.nextTick(cb, str.length)
    }
  }
}