defmodule Veriumd do

  require Logger 

  @moduledoc """
  Documentation for Veriumd.
  """

  @doc """
  Generates the target URL based on the configuration file.
  """
  defp url() do
    user = Application.get_env(:veriumd, :rpcuser)
    pass = Application.get_env(:veriumd, :rpcpass)
    host = Application.get_env(:veriumd, :rpchost)
    port = Application.get_env(:veriumd, :rpcport)
    url  = "http://#{user}:#{pass}@#{host}:#{port}"
    url
  end


  @doc """ 
  Generic command method to interface with daemon.
  """
  def rpc_command(method, params \\ []) do
    with command     <- %{jsonrpc: "1.0", method: method, params: params},
         {:ok, body} <- Poison.encode(command),
         _           <- Logger.debug("#{inspect body}"),
         {:ok, resp} <- HTTPoison.post(url(), body),
         {:ok, meta} <- Poison.decode(resp.body),
         %{"error" => nil, "result" => result} <- meta do
      {:ok, result}
    else
      %{"error" => reason} -> {:error, reason}
      error -> error
    end
  end

  @doc """
  Stops the daemon.
  """
  def stop, do: rpc_command("stop")
  @doc """ 
  Verifies the wallet integrity.
  """
  def checkwallet, do: rpc_command("checkwallet")

  @doc """ 
  Returns the hash of the best (tip) block in the longest block chain. 
  """
  def getbestblockhash, do: rpc_command("getbestblockhash")

  @doc """ 
  Returns the number of blocks in the longest block chain. 
  """
  def getblockcount, do: rpc_command("getblockcount")

  @doc """ 
  fill me in
  """
  def getblocktime, do: rpc_command("getblocktime")

  @doc """ 
  fill me in
  """
  def getcheckpoint, do: rpc_command("getcheckpoint")

  @doc """ 
  Returns the total connection count of the daemon.
  """
  def getconnectioncount, do: rpc_command("getconnectioncount")
  
  @doc """ 
  Returns the proof-of-work difficulty as a multiple of the minimum difficulty. 
  """
  def getdifficulty, do: rpc_command("getdifficulty")
  
  @doc """ 
  Returns an object containing various state info. 
  """
  def getinfo, do: rpc_command("getinfo")
  
  @doc """ 
 	Returns an object containing mining-related information:
    - blocks
    - currentblocksize
    - currentblocktx
    - difficulty
    - errors
    - generate
    - genproclimit
    - hashespersec
    - pooledtx
    - testnet
  """
  def getmininginfo, do: rpc_command("getmininginfo")
  
  @doc """ 
  Returns data about each connected node. 
  """
  def getpeerinfo, do: rpc_command("getpeerinfo")
  
  @doc """ 
  Returns all transaction ids in memory pool 
  """
  def getrawmempool, do: rpc_command("getrawmempool")
  
  @doc """ 
  Returns all addresses in the wallet and info used for coincontrol. 
  """
  def listaddressgroupings, do: rpc_command("listaddressgroupings")
  
  @doc """ 
  fill me in
  """
  def repairwallet, do: rpc_command("repairwallet")
  
  @doc """ 
  fill me in
  """
  def resendtx, do: rpc_command("resendtx")
  
  @doc """ 
  fill me in
  """
  def showalerts, do: rpc_command("showalerts")
  
  @doc """ 
  Returns the a list of functions that are supported by the rpc server.
  """
  def help, do: rpc_command("help")

    
  @doc """ 
  If [account] is not specified, returns the server's total available balance.
  If [account] is specified, returns the balance in the account. 
  """
  def getbalance(account \\ []) do 
    rpc_command("getbalance", account)
  end
    
  @doc """ 
  Returns the list of addresses for the given account. 
  """
  def getaddressesbyaccount(account \\ [""]) do
    rpc_command("getaddressesbyaccount", account)
  end

    
  @doc """ 
  Returns data needed to construct a block to work on. See BIP_0022 for more info on params.

  Example:
  getblocktemplate(["coinbasetx"], "template")
  """
  def getblocktemplate(capabilities \\ [], mode \\ "") do
    rpc_command("getblocktemplate", [%{:capablities => capabilities, :mode => mode}])
  end

    
  @doc """ 
  Returns an object about the given transaction containing:

    - "amount" : total amount of the transaction
    - "confirmations" : number of confirmations of the transaction
    - "txid" : the transaction ID
    - "time" : time associated with the transaction[1].
    - "details" - An array of objects containing:
        - "account"
        - "address"
        - "category"
        - "amount"
        - "fee"
  """
  def gettransaction(tx) do
    rpc_command("gettransaction", [tx])
  end

    
  @doc """ 
  Safely copies wallet.dat to destination, which can be a directory or a path with filename. 
  """
  def backupwallet(path) do
    rpc_command("backupwallet", [path])
  end

    
  @doc """ 
  Return information about <address>. 
  """
  def validateaddress(address) do
    rpc_command("validateaddress", [address])
  end

    
  @doc """ 
  Downloads a boostrap file for the chain and shuts down the server.
  """
  def bootstrap(overwrite \\ false) do
    rpc_command("bootstrap", [overwrite])
  end

  @doc """
  Returns hash of block in best-block-chain at <index>; index 0 is the genesis block
  """
  def getblockhash(blockid) do
    rpc_command("getblockhash", [blockid])
  end

  @doc """
  Add a nrequired-to-sign multisignature address to the wallet. 
  Each key is a bitcoin address or hex-encoded public key. 
  If [account] is specified, assign address to [account]. 
  Returns a string containing the address. 

  Note: This only works with addresses that belong to this user, because it is 
  impossible to get the public key for a "foreign" address.

  """
  def addmultisigaddress(n, keys) do
    rpc_command("addmultisigaddress", [n, keys])
  end

  @doc """
  Add a P2SH address with a specified redeemScript to the wallet.
  If [account] is specified, assign address to [account].
  """
  def addredeemscript(script, account) do
    rpc_command("addredeemscript", [script, [account]])
  end

  @doc """
  Fill me in.
  """
  def createrawtransaction() do
    raise "TODO: Implement createrawtransaction"
  end

  @doc """
  Fill me in.
  """
  def decoderawtransaction() do
    raise "TODO: Implement decoderawtransaction"
  end

  @doc """
  Fill me in.
  """
  def decodescript() do
    raise "TODO: Implement decodescript"
  end

  @doc """
  Fill me in.
  """
  def dumpprivkey() do
    raise "TODO: Implement dumpprivkey"
  end

  @doc """
  Fill me in.
  """
  def dumpwallet() do
    raise "TODO: Implement dumpwallet"
  end

  @doc """
  Fill me in.
  """
  def encryptwallet() do
    raise "TODO: Implement encryptwallet"
  end

  @doc """
  Fill me in.
  """
  def getaccount() do
    raise "TODO: Implement getaccount"
  end

  @doc """
  Fill me in.
  """
  def getaccountaddress() do
    raise "TODO: Implement getaccountaddress"
  end

  @doc """
  Fill me in.
  """
  def getblock() do
    raise "TODO: Implement getblock"
  end

  @doc """
  Fill me in.
  """
  def getblockbynumber() do
    raise "TODO: Implement getblockbynumber"
  end

  @doc """
  Fill me in.
  """
  def getnewaddress() do
    rpc_command("getnewaddress")
  end

  @doc """
  Fill me in.
  """
  def getnewpubkey() do
    raise "TODO: Implement getnewpubkey"
  end

  @doc """
  Fill me in.
  """
  def getreceivedbyaccount() do
    raise "TODO: Implement getreceivedbyaccount"
  end

  @doc """
  Fill me in.
  """
  def getreceivedbyaddress() do
    raise "TODO: Implement getreceivedbyaddress"
  end
  @doc """
  Fill me in.
  """
  def getsubsidy() do
    raise "TODO: Implement getsubsidy"
  end

  @doc """
  Fill me in.
  """
  def gettransaction() do
    raise "TODO: Implement gettransaction"
  end

  @doc """
  Fill me in.
  """
  def getwork() do
    raise "TODO: Implement getwork"
  end

  @doc """
  Fill me in.
  """
  def getworkex() do
    raise "TODO: Implement getworkex"
  end

  @doc """
  Fill me in.
  """
  def importprivkey() do
    raise "TODO: Implement importprivkey"
  end

  @doc """
  Fill me in.
  """
  def importwallet() do
    raise "TODO: Implement importwallet"
  end

  @doc """
  Fill me in.
  """
  def keypoolrefill() do
    raise "TODO: Implement keypoolrefill"
  end



  @doc """
  Fill me in.
  """
  def listaccounts() do
    raise "TODO: Implement istaccounts"
  end

  @doc """
  Fill me in.
  """
  def listreceivedbyaccount() do
    raise "TODO: Implement listreceivedbyaccount"
  end

  @doc """
  Fill me in.
  """
  def listreceivedbyaddress() do
    raise "TODO: Implement listreceivedbyaddress"
  end

  @doc """
  Fill me in.
  """
  def listsinceblock() do
    raise "TODO: Implement listsinceblock"
  end

  @doc """
  Fill me in.
  """
  def listtransactions() do
    raise "TODO: Implement listtransactions"
  end

  @doc """
  Fill me in.
  """
  def listunspent() do
    raise "TODO: Implement listunspent"
  end

  @doc """
  Fill me in.
  """
  def makekeypair() do
    raise "TODO: Implement makekeypair"
  end

  @doc """
  Fill me in.
  """
  def move() do
    raise "TODO: Implement move"
  end

  @doc """
  Fill me in.
  """
  def sendalert() do
    raise "TODO: Implement sendalert"
  end

  @doc """
  Fill me in.
  """
  def sendfrom() do
    raise "TODO: Implement sendfrom"
  end

  @doc """
  Fill me in.
  """
  def sendmany() do
    raise "TODO: Implement sendmany"
  end

  @doc """
  Fill me in.
  """
  def sendrawtransaction() do
    raise "TODO: Implement sendrawtransaction"
  end


  @doc """
  Fill me in.
  """
  def sendtoaddress() do
    raise "TODO: Implement endtoaddress"
  end


  @doc """
  Fill me in.
  """
  def setaccount() do
    raise "TODO: Implement setaccount"
  end

  @doc """
  Fill me in.
  """
  def settxfee() do
    raise "TODO: Implement settxfee"
  end

  @doc """
  Fill me in.
  """
  def signmessage() do
    raise "TODO: Implement signmessage"
  end

  @doc """
  Fill me in.
  """
  def signrawtransaction() do
    raise "TODO: Implement signrawtransaction"
  end

  @doc """
  Fill me in.
  """
  def submitblock() do
    raise "TODO: Implement submitblock"
  end

  @doc """
  Fill me in.
  """
  def validatepubkey() do
    raise "TODO: Implement validatepubkey"
  end

  @doc """
  Fill me in.
  """
  def verifymessage() do
    raise "TODO: Implement verifymessage"
  end



end