const AES_KEY = 'Gi4swf3llyafmsuK'

const sbox = new Uint8Array([
  0x63, 0x7c, 0x77, 0x7b, 0xf2, 0x6b, 0x6f, 0xc5, 0x30, 0x01, 0x67, 0x2b, 0xfe, 0xd7, 0xab, 0x76,
  0xca, 0x82, 0xc9, 0x7d, 0xfa, 0x59, 0x47, 0xf0, 0xad, 0xd4, 0xa2, 0xaf, 0x9c, 0xa4, 0x72, 0xc0,
  0xb7, 0xfd, 0x93, 0x26, 0x36, 0x3f, 0xf7, 0xcc, 0x34, 0xa5, 0xe5, 0xf1, 0x71, 0xd8, 0x31, 0x15,
  0x04, 0xc7, 0x23, 0xc3, 0x18, 0x96, 0x05, 0x9a, 0x07, 0x12, 0x80, 0xe2, 0xeb, 0x27, 0xb2, 0x75,
  0x09, 0x83, 0x2c, 0x1a, 0x1b, 0x6e, 0x5a, 0xa0, 0x52, 0x3b, 0xd6, 0xb3, 0x29, 0xe3, 0x2f, 0x84,
  0x53, 0xd1, 0x00, 0xed, 0x20, 0xfc, 0xb1, 0x5b, 0x6a, 0xcb, 0xbe, 0x39, 0x4a, 0x4c, 0x58, 0xcf,
  0xd0, 0xef, 0xaa, 0xfb, 0x43, 0x4d, 0x33, 0x85, 0x45, 0xf9, 0x02, 0x7f, 0x50, 0x3c, 0x9f, 0xa8,
  0x51, 0xa3, 0x40, 0x8f, 0x92, 0x9d, 0x38, 0xf5, 0xbc, 0xb6, 0xda, 0x21, 0x10, 0xff, 0xf3, 0xd2,
  0xcd, 0x0c, 0x13, 0xec, 0x5f, 0x97, 0x44, 0x17, 0xc4, 0xa7, 0x7e, 0x3d, 0x64, 0x5d, 0x19, 0x73,
  0x60, 0x81, 0x4f, 0xdc, 0x22, 0x2a, 0x90, 0x88, 0x46, 0xee, 0xb8, 0x14, 0xde, 0x5e, 0x0b, 0xdb,
  0xe0, 0x32, 0x3a, 0x0a, 0x49, 0x06, 0x24, 0x5c, 0xc2, 0xd3, 0xac, 0x62, 0x91, 0x95, 0xe4, 0x79,
  0xe7, 0xc8, 0x37, 0x6d, 0x8d, 0xd5, 0x4e, 0xa9, 0x6c, 0x56, 0xf4, 0xea, 0x65, 0x7a, 0xae, 0x08,
  0xba, 0x78, 0x25, 0x2e, 0x1c, 0xa6, 0xb4, 0xc6, 0xe8, 0xdd, 0x74, 0x1f, 0x4b, 0xbd, 0x8b, 0x8a,
  0x70, 0x3e, 0xb5, 0x66, 0x48, 0x03, 0xf6, 0x0e, 0x61, 0x35, 0x57, 0xb9, 0x86, 0xc1, 0x1d, 0x9e,
  0xe1, 0xf8, 0x98, 0x11, 0x69, 0xd9, 0x8e, 0x94, 0x9b, 0x1e, 0x87, 0xe9, 0xce, 0x55, 0x28, 0xdf,
  0x8c, 0xa1, 0x89, 0x0d, 0xbf, 0xe6, 0x42, 0x68, 0x41, 0x99, 0x2d, 0x0f, 0xb0, 0x54, 0xbb, 0x16,
])

const RCON = [1, 2, 4, 8, 16, 32, 64, 128, 27, 54]

const expandKey = (keyBytes) => {
  const rk = new Uint8Array(176)
  let i = 16
  let rconIdx = 0
  rk.set(keyBytes)
  while (i < 176) {
    let t = [rk[i - 4], rk[i - 3], rk[i - 2], rk[i - 1]]
    if (i % 16 === 0) {
      t = [sbox[t[1]] ^ RCON[rconIdx++], sbox[t[2]], sbox[t[3]], sbox[t[0]]]
    }
    for (let j = 0; j < 4; j++) {
      rk[i] = rk[i - 16] ^ t[j]
      i++
    }
  }
  return rk
}

const xtime = (a) => ((a << 1) ^ (a & 128 ? 27 : 0)) & 255

const mul = (a, b) => {
  let r = 0
  while (b) {
    if (b & 1) r ^= a
    a = xtime(a)
    b >>= 1
  }
  return r & 255
}

const encryptBlock = (b, rk) => {
  for (let i = 0; i < 16; i++) b[i] ^= rk[i]
  for (let round = 1; round <= 10; round++) {
    for (let i = 0; i < 16; i++) b[i] = sbox[b[i]]
    for (let r = 1; r < 4; r++) {
      const row = [b[r], b[r + 4], b[r + 8], b[r + 12]]
      for (let c = 0; c < 4; c++) b[r + 4 * c] = row[(c + r) % 4]
    }
    if (round < 10) {
      for (let c = 0; c < 4; c++) {
        const o = 4 * c
        const a0 = b[o]
        const a1 = b[o + 1]
        const a2 = b[o + 2]
        const a3 = b[o + 3]
        b[o] = mul(a0, 2) ^ mul(a1, 3) ^ a2 ^ a3
        b[o + 1] = a0 ^ mul(a1, 2) ^ mul(a2, 3) ^ a3
        b[o + 2] = a0 ^ a1 ^ mul(a2, 2) ^ mul(a3, 3)
        b[o + 3] = mul(a0, 3) ^ a1 ^ a2 ^ mul(a3, 2)
      }
    }
    for (let i = 0; i < 16; i++) b[i] ^= rk[16 * round + i]
  }
  return b
}

const pkcs7 = (bytes) => {
  const pad = 16 - (bytes.length % 16)
  const out = new Uint8Array(bytes.length + pad)
  out.set(bytes)
  out.fill(pad, bytes.length)
  return out
}

const b2a = (bytes) => {
  let s = ''
  for (let i = 0; i < bytes.length; i++) s += String.fromCharCode(bytes[i])
  return s
}

const utf8Bytes = (text) => {
  if (typeof TextEncoder !== 'undefined') {
    return new TextEncoder().encode(text)
  }
  const escaped = unescape(encodeURIComponent(text))
  const out = new Uint8Array(escaped.length)
  for (let i = 0; i < escaped.length; i++) out[i] = escaped.charCodeAt(i) & 255
  return out
}

export const encryptAesEcb = (plainText, keyStr = AES_KEY) => {
  const text = String(plainText ?? '')
  if (!text) return ''
  if (String(keyStr).length !== 16) {
    throw new Error('密钥长度必须为 16 位')
  }
  const data = pkcs7(utf8Bytes(text))
  const rk = expandKey(utf8Bytes(keyStr))
  let out = ''
  for (let off = 0; off < data.length; off += 16) {
    const b = data.slice(off, off + 16)
    encryptBlock(b, rk)
    out += b2a(b)
  }
  return btoa(out)
}