module.exports = (grunt) ->
  web3 = require('web3')
  readYaml = require('read-yaml');

  grunt.registerTask "deploy_contracts", "deploy code", (env)  =>
    blockchainConfig = readYaml.sync("config/blockchain.yml")
    rpcHost   = blockchainConfig[env || "development"].rpc_host
    rpcPort   = blockchainConfig[env || "development"].rpc_port
    gasLimit  = blockchainConfig[env || "development"].gas_limit || 100000
    gasPrice  = blockchainConfig[env || "development"].gas_price || 10000000000000

    try
      web3.setProvider(new web3.providers.HttpProvider("http://#{rpcHost}:#{rpcPort}"))
      primaryAddress = web3.eth.coinbase
      web3.eth.defaultAccount = primaryAddress
    catch e
      grunt.log.writeln("==== can't connect to #{rpcHost}:#{rpcPort} check if an ethereum node is running")
      exit

    grunt.log.writeln("address is : #{primaryAddress}")

    result  = "web3.setProvider(new web3.providers.HttpProvider('http://#{rpcHost}:#{rpcPort}'));"
    result += "web3.eth.defaultAccount = web3.eth.accounts[0];"

    contractFiles = grunt.file.expand(grunt.config.get("deploy.contracts"))
    for contractFile in contractFiles
      source = grunt.file.read(contractFile)

      grunt.log.writeln("deploying #{contractFile}")
      compiled_contracts = web3.eth.compile.solidity(source)

      #TODO: refactor this into a common method
      if compiled_contracts.info is undefined
        for className, contract of compiled_contracts
          contractAddress = web3.eth.sendTransaction({from: primaryAddress, data: contract.code, gas: gasLimit, gasPrice: gasPrice})
          grunt.log.writeln("deployed #{className} at #{contractAddress}")

          abi = JSON.stringify(contract.info.abiDefinition)

          result += "var #{className}Abi = #{abi};"
          result += "var #{className}Contract = web3.eth.contract(#{className}Abi);"
          result += "var #{className} = #{className}Contract.at('#{contractAddress}');";
      else
        #for geth < 0.9.23
        contract = compiled_contracts
        contractAddress = web3.eth.sendTransaction({from: primaryAddress, data: contract.code, gas: gasLimit})
        grunt.log.writeln("deployed at #{contractAddress}")

        abi = JSON.stringify(contract.info.abiDefinition)
        className = source.match(/contract (\w+)(?=\s[is|{])/g)[0].replace("contract ","")

        result += "var #{className}Abi = #{abi};"
        result += "var #{className}Contract = web3.eth.contract(#{className}Abi);"
        result += "var #{className} = #{className}Contract.at('#{contractAddress}');";

    destFile = grunt.config.get("deploy.dest")
    grunt.file.write(destFile, result)