'use strict';

var _Object$keys = require('babel-runtime/core-js/object/keys')['default'];

var _ = require('lodash');
var log = require('./log');

function wrapRemote(Remote) {

  /**
   *  Create options object from positional function arguments
   *
   * @param {Array} params function parameters
   * @param {Array} args function arguments
   * @return {Object} keyed options
   */

  function makeOptions(command, params, args) {
    var result = {};

    // log.warn('DEPRECATED: First argument to ' + command + ' request constructor must be an object containing' + ' request properties: ' + params.join(', '));

    if (_.isFunction(_.last(args))) {
      result.callback = args.pop();
    }

    return _.merge(result, _.zipObject(params, args));
  }

  function shiftFront(list, e) {
    var ix = 0;
    while (list[0] === e) {
      list.shift();
      ix++;
    }
    return ix;
  }

  function addBackwardsCompatibility(compatParams) {
    var method = compatParams.method;
    var command = compatParams.command;
    var _compatParams$staticMethod = compatParams.staticMethod;
    var staticMethod = _compatParams$staticMethod === undefined ? false : _compatParams$staticMethod;
    var _compatParams$positionals = compatParams.positionals;
    var positionals = _compatParams$positionals === undefined ? [] : _compatParams$positionals;
    var _compatParams$mappings = compatParams.mappings;
    var mappings = _compatParams$mappings === undefined ? {} : _compatParams$mappings;
    var _compatParams$hasCallback = compatParams.hasCallback;
    var hasCallback = _compatParams$hasCallback === undefined ? true : _compatParams$hasCallback;
    var _compatParams$aliases = compatParams.aliases;
    var aliases = _compatParams$aliases === undefined ? [] : _compatParams$aliases;

    var positionalsStartIx = shiftFront(positionals, '*');
    var needsWrapping = positionals.length || _Object$keys(mappings).length;

    function wrapFunction(func) {
      return function () {
        var optionsArg = arguments[positionalsStartIx];
        var options = {};

        if (hasCallback) {
          options.callback = arguments[positionalsStartIx + 1];
        }

        if (_.isPlainObject(optionsArg)) {
          var mapped = _.transform(optionsArg, function (result, v, k) {
            var to = mappings[k];
            result[to !== undefined ? to : k] = v;
          });
          _.merge(options, mapped);
        } else {
          // This hack handles accountRequest type helper helpers
          var commandName = positionalsStartIx ? arguments[0] : command;
          var _args = _.slice(arguments, positionalsStartIx);
          var positionalOptions = makeOptions(commandName, positionals, _args);
          _.merge(options, positionalOptions);
        }
        // Only some `positionals` get remapped to options
        var alwaysPositional = _.slice(arguments, 0, positionalsStartIx);
        var args = alwaysPositional.concat([options, options.callback]);
        return func.apply(this, args);
      };
    }

    var obj = staticMethod ? Remote : Remote.prototype;
    // Wrap the function and set the aliases
    var wrapped = needsWrapping ? wrapFunction(obj[method]) : obj[method];
    aliases.concat(method).forEach(function (name) {
      obj[name] = wrapped;
    });
  }

  var remoteMethods = [{
    method: 'requestPathFindCreate',
    command: 'path_find',
    positionals: ['source_account', 'destination_account', 'destination_amount', 'source_currencies'],
    mappings: {
      src_currencies: 'source_currencies',
      src_account: 'source_account',
      dst_amount: 'destination_amount',
      dst_account: 'destination_account'
    }
  }, {
    method: 'requestRipplePathFind',
    command: 'ripple_path_find',
    positionals: ['source_account', 'destination_account', 'destination_amount', 'source_currencies'],
    mappings: {
      src_currencies: 'source_currencies',
      src_account: 'source_account',
      dst_amount: 'destination_amount',
      dst_account: 'destination_account'
    }
  }, {
    method: 'createPathFind',
    aliases: ['pathFind'],
    command: 'pathfind',
    positionals: ['src_account', 'dst_account', 'dst_amount', 'src_currencies']
  }, {
    method: 'requestTransactionEntry',
    command: 'transaction_entry',
    positionals: ['hash', 'ledger'],
    mappings: { ledger_index: 'ledger', ledger_hash: 'ledger' }
  }, {
    method: 'requestTransaction',
    command: 'tx',
    positionals: ['hash', 'ledger'],
    mappings: { ledger_index: 'ledger', ledger_hash: 'ledger' },
    aliases: ['requestTx']
  }, {
    method: 'requestBookOffers',
    command: 'book_offers',
    positionals: ['gets', 'pays', 'taker', 'ledger', 'limit'],
    mappings: { taker_pays: 'pays', taker_gets: 'gets' }
  }, {
    method: 'createOrderBook',
    hasCallback: false,
    command: 'orderbook',
    positionals: ['currency_gets', 'issuer_gets', 'currency_pays', 'issuer_pays']
  }, {
    method: 'requestTransactionHistory',
    command: 'tx_history',
    positionals: ['start'],
    aliases: ['requestTxHistory']
  }, {
    method: 'requestWalletAccounts',
    command: 'wallet_accounts',
    positionals: ['seed']
  }, {
    method: 'requestSign',
    command: 'sign',
    positionals: ['secret', 'tx_json']
  }, {
    method: 'accountSeqCache',
    command: 'accountseqcache',
    positionals: ['account', 'ledger']
  }, {
    method: 'requestRippleBalance',
    command: 'ripplebalance',
    positionals: ['account', 'issuer', 'currency', 'ledger']
  }, {
    staticMethod: true,
    method: 'accountRequest',
    command: 'accountrequest(*)',
    positionals: ['*', 'account', 'ledger', 'peer', 'limit', 'marker']
  }, {
    staticMethod: true,
    method: 'accountRootRequest',
    command: 'accountRootRequest(*)',
    positionals: ['*', '*', 'account', 'ledger']
  }];

  remoteMethods.forEach(addBackwardsCompatibility);
}

module.exports = function wrapAPI(index) {
  wrapRemote(index.Remote);
};