/**
 * input.js - input object for bcoin
 * Copyright (c) 2014-2015, Fedor Indutny (MIT License)
 * https://github.com/indutny/bcoin
 */

var bn = require('bn.js');
var bcoin = require('../bcoin');
var utils = bcoin.utils;

/**
 * Input
 */

function Input(options) {
  var tx = options.tx;
  var lock;

  if (!(this instanceof Input))
    return new Input(options);

  if (!tx)
    throw new Error('No TX passed into Input.');

  this.out = {
    tx: options.out.tx || null,
    hash: options.out.hash || null,
    index: options.out.index
  };

  this.script = options.script ? options.script.slice() : [];
  this.seq = options.seq === undefined ? 0xffffffff : options.seq;

  if (options.script && options.script._raw)
    utils.hidden(this.script, '_raw', options.script._raw);

  if (this.output) {
    lock = this.lock;
    if (lock >= 0) {
      if (tx._lock === 0)
        tx.lock = Math.max(lock, tx.lock);
      if (!bcoin.script.spendable(this.output.script, tx.lock))
        throw new Error('Cannot spend ' + utils.revHex(this.out.hash));
    }
  }

  if (tx.lock !== 0) {
    if (options.seq === undefined)
      this.seq = 0;
  }
}

Input.prototype.__defineGetter__('data', function() {
  return bcoin.tx.getInputData(this);
});

Input.prototype.__defineGetter__('addr', function() {
  return this.data.addr;
});

Input.prototype.__defineGetter__('type', function() {
  return this.data.type;
});

Input.prototype.__defineGetter__('lock', function() {
  if (!this.output)
    return;
  return this.output.lock;
});

Input.prototype.__defineGetter__('output', function() {
  if (!this.out.tx)
    return;
  return this.out.tx.outputs[this.out.index];
});

Input.prototype.__defineGetter__('value', function() {
  if (!this.output)
    return;
  return this.output.value;
});

Input.prototype.__defineGetter__('tx', function() {
  return this.out.tx;
});

/**
 * Expose
 */

module.exports = Input;