#!/usr/bin/env node
'use strict';

process.env.UV_THREADPOOL_SIZE =
    Math.ceil(Math.max(4, require('os').cpus().length * 1.5));

var fs = require('fs'),
    path = require('path');

var async = require('async'),
    clone = require('clone'),
    cors = require('cors'),
    express = require('express'),
    morgan = require('morgan');

var serve_raster = require('./serve_raster'),
    serve_vector = require('./serve_vector'),
    utils = require('./utils');

module.exports = function(opts, callback) {
  var app = express().disable('x-powered-by'),
      maps = {};

  app.enable('trust proxy');

  callback = callback || function() {};

  if (process.env.NODE_ENV !== 'production') {
    app.use(morgan('dev'));
  }

  var configPath = path.resolve(opts.config),
      config = require(configPath);

  Object.keys(config).forEach(function(prefix) {
    if (config[prefix].cors !== false) {
      app.use(prefix, cors());
    }

    if (config[prefix].style) {
      app.use(prefix, serve_raster(maps, config[prefix], prefix));
    } else {
      app.use(prefix, serve_vector(maps, config[prefix], prefix));
    }
  });

  // serve index.html on the root
  app.use('/', express.static(path.join(__dirname, '../public')));

  // aggregate index.json on root for multiple sources
  app.get('/index.json', function(req, res, next) {
    var queue = [];
    Object.keys(config).forEach(function(prefix) {
      var map = maps[prefix];
      queue.push(function(callback) {
        var info = clone(map.tileJSON);

        info.tiles = utils.getTileUrls(
            req.protocol, config[prefix].domains, req.headers.host,
            prefix, '/{z}/{x}/{y}.{format}', info.format, req.query.key);

        callback(null, info);
      });
    });
    return async.parallel(queue, function(err, results) {
      return res.send(results);
    });
  });

  app.listen(process.env.PORT || opts.port, function() {
    console.log('Listening at http://%s:%d/',
                this.address().address, this.address().port);

    return callback();
  });
};