'use strict';

var _ = require('lodash');
var async = require('async');
var log = require('npmlog');

var express = require('express');
var querystring = require('querystring');
var bodyParser = require('body-parser')

var WalletService = require('./server');
var stats = require('../scripts/stats');

log.disableColor();
log.debug = log.verbose;
log.level = 'debug';

var ExpressApp = function() {
  this.app = express();
};

/**
 * start
 *
 * @param opts.WalletService options for WalletService class
 * @param opts.basePath
 * @param opts.disableLogs
 * @param {Callback} cb
 */
ExpressApp.prototype.start = function(opts, cb) {
  opts = opts || {};

  this.app.use(function(req, res, next) {
    res.setHeader('Access-Control-Allow-Origin', '*');
    res.setHeader('Access-Control-Allow-Methods', 'GET, POST, OPTIONS, PUT, DELETE');
    res.setHeader('Access-Control-Allow-Headers', 'x-signature,x-identity,X-Requested-With,Content-Type,Authorization');
    next();
  });
  var allowCORS = function(req, res, next) {
    if ('OPTIONS' == req.method) {
      res.sendStatus(200);
      res.end();
      return;
    }
    next();
  }
  this.app.use(allowCORS);
  this.app.enable('trust proxy');

  var POST_LIMIT = 1024 * 100 /* Max POST 100 kb */ ;

  this.app.use(bodyParser.json({
    limit: POST_LIMIT
  }));

  if (opts.disableLogs) {
    log.level = 'silent';
  } else {
    // TODO access.log
    //var accessLogStream = fs.createWriteStream(__dirname + '/access.log', {flags: 'a'})
    //app.use(morgan('combined', {stream: accessLogStream}))
    // app.use(require('morgan')('dev'));
    this.app.use(require('morgan')(':remote-addr :date[iso] ":method :url" :status :res[content-length] :response-time ":user-agent" '));
  }


  var router = express.Router();

  function returnError(err, res, req) {
    if (err instanceof WalletService.ClientError) {

      var status = (err.code == 'NOTAUTHORIZED') ? 401 : 400;
      if (!opts.disableLogs)
        log.info('Client Err: ' + status + ' ' + req.url + ' ' + err);

      res.status(status).json({
        code: err.code,
        message: err.message,
      }).end();
    } else {
      var code, message;
      if (_.isObject(err)) {
        code = err.code;
        message = err.message;
      }
      var m = message || err.toString();

      if (!opts.disableLogs)
        log.error('Err: ' + req.url + ' :' + code + ':' + m);

      res.status(code || 500).json({
        error: m,
      }).end();
    }
  };

  function getCredentials(req) {
    var identity = req.header('x-identity');
    if (!identity) return;

    return {
      copayerId: identity,
      signature: req.header('x-signature'),
    };
  };

  function getServerWithAuth(req, res, cb) {
    var credentials = getCredentials(req);
    if (!credentials)
      return returnError(new WalletService.ClientError({
        code: 'NOTAUTHORIZED'
      }), res, req);

    var auth = {
      copayerId: credentials.copayerId,
      message: req.method.toLowerCase() + '|' + req.url + '|' + JSON.stringify(req.body),
      signature: credentials.signature,
    };
    WalletService.getInstanceWithAuth(auth, function(err, server) {
      if (err) return returnError(err, res, req);
      return cb(server);
    });
  };

  router.post('/v1/wallets/', function(req, res) {
    var server = WalletService.getInstance();
    server.createWallet(req.body, function(err, walletId) {
      if (err) return returnError(err, res, req);
      res.json({
        walletId: walletId,
      });
    });
  });

  router.post('/v1/wallets/:id/copayers/', function(req, res) {
    req.body.walletId = req.params['id'];
    var server = WalletService.getInstance();
    server.joinWallet(req.body, function(err, result) {
      if (err) return returnError(err, res, req);

      res.json(result);
    });
  });


  router.put('/v1/copayers', function(req, res) {
    getServerWithAuth(req, res, function(server) {
      server.replaceTemporaryRequestKey(req.body, function(err, result) {
        if (err) return returnError(err, res, req);
        res.json(result);
      });
    });
  });


  router.get('/v1/wallets/', function(req, res) {
    getServerWithAuth(req, res, function(server) {
      var result = {};
      async.parallel([

        function(next) {
          server.getWallet({}, function(err, wallet) {
            if (err) return next(err);
            result.wallet = wallet;
            next();
          });
        },
        function(next) {
          server.getBalance({}, function(err, balance) {
            if (err) return next(err);
            result.balance = balance;
            next();
          });
        },
        function(next) {
          server.getPendingTxs({}, function(err, pendingTxps) {
            if (err) return next(err);
            result.pendingTxps = pendingTxps;
            next();
          });
        },
      ], function(err) {
        if (err) return returnError(err, res, req);
        res.json(result);
      });
    });
  });


  router.get('/v1/txproposals/', function(req, res) {
    getServerWithAuth(req, res, function(server) {
      server.getPendingTxs({}, function(err, pendings) {
        if (err) return returnError(err, res, req);
        res.json(pendings);
      });
    });
  });


  router.post('/v1/txproposals/', function(req, res) {
    getServerWithAuth(req, res, function(server) {
      server.createTx(req.body, function(err, txp) {
        if (err) return returnError(err, res, req);
        res.json(txp);
      });
    });
  });


  router.post('/v1/addresses/', function(req, res) {
    getServerWithAuth(req, res, function(server) {
      server.createAddress(req.body, function(err, address) {
        if (err) return returnError(err, res, req);
        res.json(address);
      });
    });
  });

  router.get('/v1/addresses/', function(req, res) {
    getServerWithAuth(req, res, function(server) {
      server.getMainAddresses({}, function(err, addresses) {
        if (err) return returnError(err, res, req);
        res.json(addresses);
      });
    });
  });

  router.get('/v1/balance/', function(req, res) {
    getServerWithAuth(req, res, function(server) {
      server.getBalance({}, function(err, balance) {
        if (err) return returnError(err, res, req);
        res.json(balance);
      });
    });
  });

  router.post('/v1/txproposals/:id/signatures/', function(req, res) {
    getServerWithAuth(req, res, function(server) {
      req.body.txProposalId = req.params['id'];
      server.signTx(req.body, function(err, txp) {
        if (err) return returnError(err, res, req);
        res.json(txp);
        res.end();
      });
    });
  });

  // TODO Check HTTP verb and URL name
  router.post('/v1/txproposals/:id/broadcast/', function(req, res) {
    getServerWithAuth(req, res, function(server) {
      req.body.txProposalId = req.params['id'];
      server.broadcastTx(req.body, function(err, txp) {
        if (err) return returnError(err, res, req);
        res.json(txp);
        res.end();
      });
    });
  });

  router.post('/v1/txproposals/:id/rejections', function(req, res) {
    getServerWithAuth(req, res, function(server) {
      req.body.txProposalId = req.params['id'];
      server.rejectTx(req.body, function(err, txp) {
        if (err) return returnError(err, res, req);
        res.json(txp);
        res.end();
      });
    });
  });

  router.delete('/v1/txproposals/:id/', function(req, res) {
    getServerWithAuth(req, res, function(server) {
      req.body.txProposalId = req.params['id'];
      server.removePendingTx(req.body, function(err) {
        if (err) return returnError(err, res, req);
        res.json({
          success: true
        });
        res.end();
      });
    });
  });

  router.get('/v1/txproposals/:id/', function(req, res) {
    getServerWithAuth(req, res, function(server) {
      req.body.txProposalId = req.params['id'];
      server.getTx(req.body, function(err, tx) {
        if (err) return returnError(err, res, req);
        res.json(tx);
        res.end();
      });
    });
  });

  router.get('/v1/txhistory/', function(req, res) {
    getServerWithAuth(req, res, function(server) {
      var opts = {};
      if (req.query.skip) opts.skip = +req.query.skip;
      if (req.query.limit) opts.limit = +req.query.limit;

      server.getTxHistory(opts, function(err, txs) {
        if (err) return returnError(err, res, req);
        res.json(txs);
        res.end();
      });
    });
  });

  router.post('/v1/addresses/scan/', function(req, res) {
    getServerWithAuth(req, res, function(server) {
      server.startScan(req.body, function(err, started) {
        if (err) return returnError(err, res, req);
        res.json(started);
        res.end();
      });
    });
  });

  router.get('/v1/stats/', function(req, res) {
    var data = stats.getStats(function(err, data) {
      if (err) return returnError(err, res, req);
      res.json(data);
      res.end();
    });
  });


  this.app.use(opts.basePath || '/bws/api', router);

  WalletService.initialize(opts, cb);

};

module.exports = ExpressApp;