module Bip44

  # "44'",  # bip 44
  # "60'",  # coin, 0': bitcoin, 60': ethereum
  # "0'",   # wallet
  # "0"     # 0 - public, 1 = private
  # "0"     # index
  class Wallet
    include Bip44::Bitcoin
    include Bip44::Ethereum

    def self.from_seed(seed, path)
      master = MoneyTree::Master.new(seed_hex: seed) # 3. 种子用于使用 HMAC-SHA512 生成根私钥（参见 BIP32）
      wallet_node = master.node_for_path(path) # 4. 从该根私钥，导出子私钥（参见 BIP32），其中节点布局由BIP44设置
      Wallet.new(wallet_node)
    end

    def self.from_mnemonic(mnemonic, path)
      seed = BipMnemonic.to_seed(mnemonic: mnemonic) # 2. 该助记词使用 PBKDF2 转化为种子（参见 BIP39）
      Wallet.from_seed(seed, path)
    end
    
    def self.from_xpub(xpub)
      wallet_node = MoneyTree::Node.from_bip32(xpub)
      Wallet.new(wallet_node)
    end

    def self.from_xprv(xprv)
      wallet_node = MoneyTree::Node.from_bip32(xprv)
      Wallet.new(wallet_node)
    end

    def sub_wallet(path)
      Wallet.new(@wallet_node.node_for_path(path))
    end

    def xpub(testnet: false)
      return @wallet_node.to_bip32(:public, network: :bitcoin_testnet) if testnet
      @wallet_node.to_bip32(:public)
    end

    def xprv(testnet: :false)
      return @wallet_node.to_bip32(:private, network: :bitcoin_testnet) if testnet
      @wallet_node.to_bip32(:private)
    end

    def wif(compressed: true, testnet: false)
      return @wallet_node.private_key.to_wif(compressed: compressed, network: :bitcoin_testnet) if testnet
      @wallet_node.private_key.to_wif(compressed: compressed)
    end

    def private_key
      @wallet_node.private_key.to_hex
    end

    def public_key
      @wallet_node.public_key.uncompressed.to_hex
    end

    private

    def initialize(wallet_node)
      @wallet_node = wallet_node
    end

  end

end