var express = require('express')
  , path = require('path')
  , nodeapi = require('./lib/nodeapi')
  , favicon = require('serve-favicon')
  , logger = require('morgan')
  , cookieParser = require('cookie-parser')
  , bodyParser = require('body-parser')
  , settings = require('./lib/settings')
  , routes = require('./routes/index')
  , lib = require('./lib/explorer')
  , db = require('./lib/database')
  , package_metadata = require('./package.json')
  , locale = require('./lib/locale')
  , request = require('postman-request');

var app = express();

// nodeapi
nodeapi.setWalletDetails(settings.wallet);
if (settings.heavy != true) {
  nodeapi.setAccess('only', ['getinfo', 'getnetworkhashps', 'getmininginfo','getdifficulty', 'getconnectioncount',
  'getmasternodecount', 'getmasternodelist', 'getvotelist', 'getblockcount', 'getblockhash', 'getblock', 'getrawtransaction', 
  'getpeerinfo', 'gettxoutsetinfo', 'verifymessage']);
} else {
  // enable additional heavy api calls
  /*
    getvote - Returns the current block reward vote setting.
    getmaxvote - Returns the maximum allowed vote for the current phase of voting.
    getphase - Returns the current voting phase ('Mint', 'Limit' or 'Sustain').
    getreward - Returns the current block reward, which has been decided democratically in the previous round of block reward voting.
    getnextrewardestimate - Returns an estimate for the next block reward based on the current state of decentralized voting.
    getnextrewardwhenstr - Returns string describing how long until the votes are tallied and the next block reward is computed.
    getnextrewardwhensec - Same as above, but returns integer seconds.
    getsupply - Returns the current money supply.
    getmaxmoney - Returns the maximum possible money supply.
  */
  nodeapi.setAccess('only', ['getinfo', 'getstakinginfo', 'getnetworkhashps', 'getdifficulty', 'getconnectioncount',
    'getmasternodecount', 'getmasternodelist', 'getvotelist', 'getblockcount', 'getblockhash', 
    'getblock', 'getrawtransaction', 'getmaxmoney', 'getvote', 'getmaxvote', 'getphase', 'getreward', 'getpeerinfo', 
    'getnextrewardestimate', 'getnextrewardwhenstr', 'getnextrewardwhensec', 'getsupply', 'gettxoutsetinfo', 'verifymessage']);
}
// determine if cors should be enabled
if (settings.usecors == true) {
	app.use(function(req, res, next) {
	   res.header("Access-Control-Allow-Origin", settings.corsorigin);
	   res.header('Access-Control-Allow-Methods', 'DELETE, PUT, GET, POST');
	   res.header("Access-Control-Allow-Headers", "Origin, X-Requested-With, Content-Type, Accept");
	   next();
	});
}
// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'pug');

app.use(favicon(path.join(__dirname, settings.favicon)));
app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));

// routes
app.use('/api', nodeapi.app);
app.use('/', routes);
app.use('/ext/getmoneysupply', function(req,res) {
  lib.get_supply(function(supply) {
    res.setHeader('content-type', 'text/plain');
    res.end((supply ? supply.toString() : '0'));
  });
});

app.use('/ext/getaddress/:hash', function(req,res){
  db.get_address(req.params.hash, false, function(address){
    db.get_address_txs_ajax(req.params.hash, 0, settings.txcount, function(txs, count){
      if (address) {
        var last_txs = [];
        for(i=0; i<txs.length; i++){
          if(typeof txs[i].txid !== "undefined") {
            var out = 0,
            vin = 0,
            tx_type = 'vout',
            row = {};
            txs[i].vout.forEach(function (r) {
              if (r.addresses == req.params.hash) {
                out += r.amount;
              }
            });
            txs[i].vin.forEach(function (s) {
              if (s.addresses == req.params.hash) {
                vin += s.amount;
              }
            });
            if (vin > out) {
              tx_type = 'vin';
            }
            row['addresses'] = txs[i].txid;
            row['type'] = tx_type;
            last_txs.push(row);
          }
        }
        var a_ext = {
          address: address.a_id,
          sent: (address.sent / 100000000),
          received: (address.received / 100000000),
          balance: (address.balance / 100000000).toString().replace(/(^-+)/mg, ''),
          last_txs: last_txs
        };
        res.send(a_ext);
      } else {
        res.send({ error: 'address not found.', hash: req.params.hash});
      }
    });
  });
});

app.use('/ext/gettx/:txid', function(req, res) {
  var txid = req.params.txid;
  db.get_tx(txid, function(tx) {
    if (tx) {
      lib.get_blockcount(function(blockcount) {
        res.send({ active: 'tx', tx: tx, confirmations: settings.confirmations, blockcount: (blockcount ? blockcount : 0)});
      });
    }
    else {
      lib.get_rawtransaction(txid, function(rtx) {
        if (rtx && rtx.txid) {
          lib.prepare_vin(rtx, function(vin) {
            lib.prepare_vout(rtx.vout, rtx.txid, vin, ((typeof rtx.vjoinsplit === 'undefined' || rtx.vjoinsplit == null) ? [] : rtx.vjoinsplit), function(rvout, rvin) {
              lib.calculate_total(rvout, function(total){
                if (!rtx.confirmations > 0) {
                  var utx = {
                    txid: rtx.txid,
                    vin: rvin,
                    vout: rvout,
                    total: total.toFixed(8),
                    timestamp: rtx.time,
                    blockhash: '-',
                    blockindex: -1,
                  };
                  res.send({ active: 'tx', tx: utx, confirmations: settings.confirmations, blockcount:-1});
                } else {
                  var utx = {
                    txid: rtx.txid,
                    vin: rvin,
                    vout: rvout,
                    total: total.toFixed(8),
                    timestamp: rtx.time,
                    blockhash: rtx.blockhash,
                    blockindex: rtx.blockheight,
                  };
                  lib.get_blockcount(function(blockcount) {
                    res.send({ active: 'tx', tx: utx, confirmations: settings.confirmations, blockcount: (blockcount ? blockcount : 0)});
                  });
                }
              });
            });
          });
        } else {
          res.send({ error: 'tx not found.', hash: txid});
        }
      });
    }
  });
});

app.use('/ext/getbalance/:hash', function(req,res){
  db.get_address(req.params.hash, false, function(address){
    if (address) {
      res.setHeader('content-type', 'text/plain');
      res.end((address.balance / 100000000).toString().replace(/(^-+)/mg, ''));
    } else {
      res.send({ error: 'address not found.', hash: req.params.hash})
    }
  });
});

app.use('/ext/getdistribution', function(req,res){
  db.get_richlist(settings.coin, function(richlist){
    db.get_stats(settings.coin, function(stats){
      db.get_distribution(richlist, stats, function(dist){
        res.send(dist);
      });
    });
  });
});

app.use('/ext/getcurrentprice', function(req,res){
  db.get_stats(settings.coin, function (stats) {
	  eval('var p_ext = { "last_price_'+settings.markets.exchange.toLowerCase()+'": stats.last_price, "last_price_usd": stats.last_usd_price, }');
      res.send(p_ext);
  });
});

app.use('/ext/getbasicstats', function(req,res) {
  lib.get_blockcount(function(blockcount) {
    lib.get_supply(function(supply) {
      db.get_stats(settings.coin, function (stats) {
        lib.get_masternodecount(function(masternodestotal) {
          eval('var p_ext = { "block_count": (blockcount ? blockcount : 0), "money_supply": (supply ? supply : 0), "last_price_'+settings.markets.exchange.toLowerCase()+'": stats.last_price, "last_price_usd": stats.last_usd_price, "masternode_count": masternodestotal.total }');
          res.send(p_ext);
        });
      });
    });
  });
});

app.use('/ext/getlasttxs/:min', function(req, res) {
  var min = req.params.min, start, length;
  // split url suffix by forward slash and remove blank entries
  var split = req.url.split('/').filter(function(v) { return v; });
  // determine how many parameters were passed
  switch (split.length) {
    case 2:
      // capture start and length
      start = split[0];
      length = split[1];
      break;
    default:
      if (split.length == 1) {
        // capture start
        start = split[0];
      } else if (split.length > 2) {
        // capture start and length
        start = split[0];
        length = split[1];
      }
      break;
  }

  // fix parameters
  if (typeof length === 'undefined' || isNaN(length) || length > settings.index.last_txs)
    length = settings.index.last_txs;
  if (typeof start === 'undefined' || isNaN(start) || start < 0)
    start = 0;
  if (typeof min === 'undefined' || isNaN(min) || min < 0)
    min  = 0;
  else
    min  = (min * 100000000);

  db.get_last_txs(start, length, min, function(data, count) {
    res.json({"data":data, "recordsTotal": count, "recordsFiltered": count});
  });
});

app.use('/ext/getaddresstxs/:address/:start/:length', function(req,res) {
  // fix parameters
  if (typeof req.params.length === 'undefined' || isNaN(req.params.length) || req.params.length > settings.txcount)
    req.params.length = settings.txcount;
  if (typeof req.params.start === 'undefined' || isNaN(req.params.start) || req.params.start < 0)
    req.params.start = 0;
  if (typeof req.params.min === 'undefined' || isNaN(req.params.min) || req.params.min < 0)
    req.params.min  = 0;
  else
    req.params.min  = (req.params.min * 100000000);

  db.get_address_txs_ajax(req.params.address, req.params.start, req.params.length, function(txs, count) {
    var data = [];
    for (i = 0; i < txs.length; i++) {
      if (typeof txs[i].txid !== "undefined") {
        var out = 0;
        var vin = 0;

        txs[i].vout.forEach(function(r) {
          if (r.addresses == req.params.address) {
            out += r.amount;
          }
        });

        txs[i].vin.forEach(function(s) {
          if (s.addresses == req.params.address) {
            vin += s.amount;
          }
        });

        var row = [];
        row.push(new Date((txs[i].timestamp) * 1000).toUTCString());
        row.push(txs[i].txid);
        row.push(out);
        row.push(vin);
        row.push(txs[i].balance);
        data.push(row);
      }
    }

    res.json({"data":data, "recordsTotal": count, "recordsFiltered": count});
  });
});

app.post('/address/:hash/claim', function(req, res) {
  lib.verify_message(req.body.address, req.body.signature, req.body.message, function(body) {
    if (body == false) {
      res.json({'status': 'failed', 'error': true, 'message': 'Invalid signature'});
    } else if (body == true) {
      db.update_label(req.body.address, req.body.message, function() {
        res.json({'status': 'success'});
      });
    } else
      res.json({'status': 'failed', 'error': true, 'message': 'There was an error. Check your console.'});
  });
});

app.use('/ext/connections', function(req,res){
  db.get_peers(function(peers){
    res.send({data: peers});
  });
});

// locals
app.set('title', settings.title);
app.set('explorer_version', package_metadata.version);
app.set('symbol', settings.symbol);
app.set('coin', settings.coin);
app.set('locale', locale);
app.set('display', settings.display);
app.set('markets', settings.markets);
app.set('twitter', settings.twitter);
app.set('facebook', settings.facebook);
app.set('googleplus', settings.googleplus);
app.set('bitcointalk', settings.bitcointalk);
app.set('github', settings.github);
app.set('slack', settings.slack);
app.set('discord', settings.discord);
app.set('telegram', settings.telegram);
app.set('reddit', settings.reddit);
app.set('youtube', settings.youtube);
app.set('website', settings.website);

app.set('genesis_block', settings.genesis_block);
app.set('index', settings.index);
app.set('use_rpc', settings.use_rpc);
app.set('heavy', settings.heavy);
app.set('save_stats_after_sync_blocks', settings.save_stats_after_sync_blocks);
app.set('lock_during_index', settings.lock_during_index);
app.set('txcount', settings.txcount);
app.set('txcount_per_page', settings.txcount_per_page);
app.set('nethash', settings.nethash);
app.set('nethash_units', settings.nethash_units);
app.set('show_sent_received', settings.show_sent_received);
app.set('logo', settings.logo);
app.set('theme', settings.theme);
app.set('labels', settings.labels);
app.set('homelink', settings.homelink);
app.set('logoheight', settings.logoheight);
app.set('burned_coins', settings.burned_coins);
app.set('api_cmds', settings.api_cmds);

app.set('sticky_header', settings.sticky_header);
app.set('sticky_footer', settings.sticky_footer);

app.set('footer_height_desktop', settings.footer_height_desktop);
app.set('footer_height_tablet', settings.footer_height_tablet);
app.set('footer_height_mobile', settings.footer_height_mobile);

app.set('social_link_percent_height_desktop', settings.social_link_percent_height_desktop);
app.set('social_link_percent_height_tablet', settings.social_link_percent_height_tablet);
app.set('social_link_percent_height_mobile', settings.social_link_percent_height_mobile);

// determine panel offset based on which panels are enabled
var paneltotal=5;
var panelcount=(settings.display.networkpnl > 0 ? 1 : 0)+(settings.display.difficultypnl > 0 ? 1 : 0)+(settings.display.masternodespnl > 0 ? 1 : 0)+(settings.display.coinsupplypnl > 0 ? 1 : 0)+(settings.display.pricepnl > 0 ? 1 : 0);
app.set('paneloffset', paneltotal+1-panelcount);

// determine panel order
var panelorder = new Array();
if (settings.display.networkpnl > 0) panelorder.push({name: 'networkpnl', val: settings.display.networkpnl});
if (settings.display.difficultypnl > 0) panelorder.push({name: 'difficultypnl', val: settings.display.difficultypnl});
if (settings.display.masternodespnl > 0) panelorder.push({name: 'masternodespnl', val: settings.display.masternodespnl});
if (settings.display.coinsupplypnl > 0) panelorder.push({name: 'coinsupplypnl', val: settings.display.coinsupplypnl});
if (settings.display.pricepnl > 0) panelorder.push({name: 'pricepnl', val: settings.display.pricepnl});
panelorder.sort(function(a,b) { return a.val - b.val; });
for (var i=1; i<6; i++) {
  app.set('panel'+i.toString(), ((panelorder.length >= i) ? panelorder[i-1].name : ''));
}

// Dynamically populate market names
var market_names = {};

settings.markets.enabled.forEach(function (market) {
  // Check if market file exists
  if (db.fs.existsSync('./lib/markets/' + market + '.js')) {
    // Load market file
    var exMarket = require('./lib/markets/' + market);
    // Save market_name from market file to settings
    eval('market_names.' + market + ' = "' + exMarket.market_name + '";');
  }
});

app.set('market_names', market_names);

// catch 404 and forward to error handler
app.use(function(req, res, next) {
    var err = new Error('Not Found');
    err.status = 404;
    next(err);
});

// development error handler
// will print stacktrace
if (app.get('env') === 'development') {
    app.use(function(err, req, res, next) {
        res.status(err.status || 500);
        res.render('error', {
            message: err.message,
            error: err
        });
    });
}

// production error handler
// no stacktraces leaked to user
app.use(function(err, req, res, next) {
    res.status(err.status || 500);
    res.render('error', {
        message: err.message,
        error: {}
    });
});

module.exports = app;