/*
    This file is part of ethereum.js.

    ethereum.js is free software: you can redistribute it and/or modify
    it under the terms of the GNU Lesser General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    ethereum.js is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public License
    along with ethereum.js.  If not, see <http://www.gnu.org/licenses/>.
*/
/** 
 * @file formatters.js
 * @author Marek Kotewicz <marek@ethdev.com>
 * @author Fabian Vogelsteller <fabian@ethdev.com>
 * @date 2015
 */

var utils = require('../utils/utils');
var config = require('../utils/config');

/**
 * Should the format output to a big number
 *
 * @method outputBigNumberFormatter
 * @param {String|Number|BigNumber}
 * @returns {BigNumber} object
 */
var outputBigNumberFormatter = function (number) {
    return utils.toBigNumber(number);
};

var isPredefinedBlockNumber = function (blockNumber) {
    return blockNumber === 'latest' || blockNumber === 'pending' || blockNumber === 'earliest';
};

var inputDefaultBlockNumberFormatter = function (blockNumber) {
    if (blockNumber === undefined) {
        return config.defaultBlock;
    }
    return inputBlockNumberFormatter(blockNumber);
};

var inputBlockNumberFormatter = function (blockNumber) {
    if (blockNumber === undefined) {
        return undefined;
    } else if (isPredefinedBlockNumber(blockNumber)) {
        return blockNumber;
    }
    return utils.toHex(blockNumber);
};

/**
 * Formats the input of a transaction and converts all values to HEX
 *
 * @method inputTransactionFormatter
 * @param {Object} transaction options
 * @returns object
*/
var inputTransactionFormatter = function (options){

    options.from = options.from || config.defaultAccount;

    // make code -> data
    if (options.code) {
        options.data = options.code;
        delete options.code;
    }

    ['gasPrice', 'gas', 'value'].filter(function (key) {
        return options[key] !== undefined;
    }).forEach(function(key){
        options[key] = utils.fromDecimal(options[key]);
    });

    return options; 
};

/**
 * Formats the output of a transaction to its proper values
 * 
 * @method outputTransactionFormatter
 * @param {Object} transaction
 * @returns {Object} transaction
*/
var outputTransactionFormatter = function (tx){
    tx.blockNumber = utils.toDecimal(tx.blockNumber);
    tx.transactionIndex = utils.toDecimal(tx.transactionIndex);
    tx.nonce = utils.toDecimal(tx.nonce);
    tx.gas = utils.toDecimal(tx.gas);
    tx.gasPrice = utils.toBigNumber(tx.gasPrice);
    tx.value = utils.toBigNumber(tx.value);
    return tx;
};

/**
 * Formats the output of a block to its proper values
 *
 * @method outputBlockFormatter
 * @param {Object} block object 
 * @returns {Object} block object
*/
var outputBlockFormatter = function(block) {

    // transform to number
    block.gasLimit = utils.toDecimal(block.gasLimit);
    block.gasUsed = utils.toDecimal(block.gasUsed);
    block.size = utils.toDecimal(block.size);
    block.timestamp = utils.toDecimal(block.timestamp);
    block.number = utils.toDecimal(block.number);

    block.difficulty = utils.toBigNumber(block.difficulty);
    block.totalDifficulty = utils.toBigNumber(block.totalDifficulty);

    if (utils.isArray(block.transactions)) {
        block.transactions.forEach(function(item){
            if(!utils.isString(item))
                return outputTransactionFormatter(item);
        });
    }

    return block;
};

/**
 * Formats the output of a log
 * 
 * @method outputLogFormatter
 * @param {Object} log object
 * @returns {Object} log
*/
var outputLogFormatter = function(log) {
    if (log === null) { // 'pending' && 'latest' filters are nulls
        return null;
    }

    log.blockNumber = utils.toDecimal(log.blockNumber);
    log.transactionIndex = utils.toDecimal(log.transactionIndex);
    log.logIndex = utils.toDecimal(log.logIndex);

    return log;
};

/**
 * Formats the input of a whisper post and converts all values to HEX
 *
 * @method inputPostFormatter
 * @param {Object} transaction object
 * @returns {Object}
*/
var inputPostFormatter = function(post) {

    post.payload = utils.toHex(post.payload);
    post.ttl = utils.fromDecimal(post.ttl);
    post.workToProve = utils.fromDecimal(post.workToProve);
    post.priority = utils.fromDecimal(post.priority);

    // fallback
    if (!utils.isArray(post.topics)) {
        post.topics = post.topics ? [post.topics] : [];
    }

    // format the following options
    post.topics = post.topics.map(function(topic){
        return utils.fromAscii(topic);
    });

    return post; 
};

/**
 * Formats the output of a received post message
 *
 * @method outputPostFormatter
 * @param {Object}
 * @returns {Object}
 */
var outputPostFormatter = function(post){

    post.expiry = utils.toDecimal(post.expiry);
    post.sent = utils.toDecimal(post.sent);
    post.ttl = utils.toDecimal(post.ttl);
    post.workProved = utils.toDecimal(post.workProved);
    post.payloadRaw = post.payload;
    post.payload = utils.toAscii(post.payload);

    if (utils.isJson(post.payload)) {
        post.payload = JSON.parse(post.payload);
    }

    // format the following options
    if (!post.topics) {
        post.topics = [];
    }
    post.topics = post.topics.map(function(topic){
        return utils.toAscii(topic);
    });

    return post;
};

module.exports = {
    inputDefaultBlockNumberFormatter: inputDefaultBlockNumberFormatter,
    inputBlockNumberFormatter: inputBlockNumberFormatter,
    inputTransactionFormatter: inputTransactionFormatter,
    inputPostFormatter: inputPostFormatter,
    outputBigNumberFormatter: outputBigNumberFormatter,
    outputTransactionFormatter: outputTransactionFormatter,
    outputBlockFormatter: outputBlockFormatter,
    outputLogFormatter: outputLogFormatter,
    outputPostFormatter: outputPostFormatter
};