var imports            = require('soop').imports();

var parent = imports.parent || require('./util/VersionedData');
var networks= imports.networks || require('./networks');

//compressed is true if public key is compressed; false otherwise
function PrivateKey(version, buf, compressed) {
  PrivateKey.super(this, arguments);
  if (compressed !== undefined)
    this.compressed(compressed);
};

PrivateKey.parent = parent;
parent.applyEncodingsTo(PrivateKey);

PrivateKey.prototype.validate = function() {
  this.doAsBinary(function() {
    PrivateKey.super(this, 'validate', arguments);
    if (this.data.length < 32 || (this.data.length > 1+32 && !this.compressed()) || (this.data.length==1+32+1 && this.data[1+32+1-1]!=1) || this.data.length>1+32+1)
      throw new Error('invalid data length');
  });
  if (typeof this.network() === 'undefined') throw new Error('invalid network');
};

// get or set the payload data (as a Buffer object)
// overloaded from VersionedData
PrivateKey.prototype.payload = function(data) {
  if(data) {
    this.doAsBinary(function() {data.copy(this.data,1);});
    return data;
  }
  var buf=this.as('binary');
  if (buf.length==1+32+1)
    return buf.slice(1,1+32);
  else if (buf.length==1+32)
    return buf.slice(1);
};

// get or set whether the corresponding public key is compressed
PrivateKey.prototype.compressed = function(compressed) {
  if (compressed !== undefined) {
    this.doAsBinary(function(){
      var len=1+32+1;
      if (compressed) {
        var data=new Buffer(len);
        this.data.copy(data);
        this.data=data;
        this.data[len-1]=1;
      } else {
        this.data=this.data.slice(0,len-1);
      }
    });
  }
  else {
    var len=1+32+1;
    var data=this.as('binary');
    if (data.length==len && data[len-1]==1)
      return true;
    else if (data.length==len-1)
      return false;
    else
      throw new Error('invalid private key');
  }
};

PrivateKey.prototype.network = function() {
  var version = this.version();

  var livenet = networks.livenet;
  var testnet = networks.testnet;

  var answer;
  if (version === livenet.keySecret)
    answer = livenet;
  else if (version === testnet.keySecret)
    answer = testnet;

  return answer;
};

module.exports = require('soop')(PrivateKey);