var os = require('os');
var _ = require('underscore');
var windshaft = require('windshaft');
var OverviewsHandler = windshaft.OverviewsHandler;

var overviewsHandler = new OverviewsHandler({
  zoom_level: 'CDB_ZoomFromScale(!scale_denominator!)'
});

var rendererConfig = _.defaults(global.environment.renderer || {}, {
    cache_ttl: 60000, // milliseconds
    statsInterval: 60000,
    mapnik: {
        poolSize: 8,
        metatile: 2,
        bufferSize: 64,
        snapToGrid: false,
        clipByBox2d: false,
        limits: {}
    },
    http: {}
});

rendererConfig.mapnik.overviewsHandler = overviewsHandler;

// Perform keyword substitution in statsd
// See https://github.com/CartoDB/Windshaft-cartodb/issues/153
if ( global.environment.statsd ) {
    if ( global.environment.statsd.prefix ) {
        var host_token = os.hostname().split('.').reverse().join('.');
        global.environment.statsd.prefix = global.environment.statsd.prefix.replace(/:host/, host_token);
    }
}

module.exports = {
    bind: {
        port: global.environment.port,
        host: global.environment.host
    },
        // This is for inline maps and table maps
        base_url: global.environment.base_url_legacy || '/tiles/:table',

        /// @deprecated with Windshaft-0.17.0
        ///base_url_notable: '/tiles',

        // This is for Detached maps
        //
        // "maps" is the official, while
        // "tiles/layergroup" is for backward compatibility up to 1.6.x
        //
        base_url_mapconfig: global.environment.base_url_detached || '(?:/maps|/tiles/layergroup)',

        base_url_templated: global.environment.base_url_templated || '(?:/maps/named|/tiles/template)',

        grainstore: {
          map: {
            // TODO: allow to specify in configuration
            srid: 3857
          },
          datasource: global.environment.postgres,
          cachedir: global.environment.millstone.cache_basedir,
          mapnik_version: global.environment.mapnik_version,
          mapnik_tile_format: global.environment.mapnik_tile_format || 'png',
          default_layergroup_ttl: global.environment.mapConfigTTL || 7200
        },
        statsd: global.environment.statsd,
        renderCache: {
            ttl: rendererConfig.cache_ttl,
            statsInterval: rendererConfig.statsInterval
        },
        renderer: {
            mapnik: rendererConfig.mapnik,
            torque: rendererConfig.torque,
            http: rendererConfig.http
        },
        // Do not send unwatch on release. See http://github.com/CartoDB/Windshaft-cartodb/issues/161
        redis: _.extend(global.environment.redis, {unwatchOnRelease: false}),
        enable_cors: global.environment.enable_cors,
        varnish_host: global.environment.varnish.host,
        varnish_port: global.environment.varnish.port,
        varnish_http_port: global.environment.varnish.http_port,
        varnish_secret: global.environment.varnish.secret,
        varnish_purge_enabled: global.environment.varnish.purge_enabled,
        fastly: global.environment.fastly || {},
        cache_enabled: global.environment.cache_enabled,
        log_format: global.environment.log_format,
        useProfiler: global.environment.useProfiler
};