var queue = require('queue-async');
var _ = require('underscore');

var camshaft = require('camshaft');
var dot = require('dot');
dot.templateSettings.strip = false;

function MapConfigAnalysisLayersAdapter(templateMaps) {
    this.templateMaps = templateMaps;
}

module.exports = MapConfigAnalysisLayersAdapter;


var multitypeStyleTemplate = dot.template([
    "#points['mapnik::geometry_type'=1] {",
    "  marker-fill-opacity: {{=it._opacity}};",
    "  marker-line-color: #FFF;",
    "  marker-line-width: 0.5;",
    "  marker-line-opacity: {{=it._opacity}};",
    "  marker-placement: point;",
    "  marker-type: ellipse;",
    "  marker-width: 4;",
    "  marker-fill: {{=it._color}};",
    "  marker-allow-overlap: true;",
    "}",
    "#lines['mapnik::geometry_type'=2] {",
    "  line-color: {{=it._color}};",
    "  line-width: 2;",
    "  line-opacity: {{=it._opacity}};",
    "}",
    "#polygons['mapnik::geometry_type'=3] {",
    "  polygon-fill: {{=it._color}};",
    "  polygon-opacity: 0.7;",
    "  line-color: #FFF;",
    "  line-width: 0.5;",
    "  line-opacity: {{=it._opacity}};",
    "}"
].join('\n'));

function multiTypeStyle(color, opacity) {
    return multitypeStyleTemplate({
        _opacity: opacity || 1.0,
        _color: color || 'red'
    });
}

var layerQueryTemplate = dot.template([
    'SELECT ST_Transform(the_geom, 3857) the_geom_webmercator',
    'FROM ({{=it._query}}) _cdb_analysis_query'
].join('\n'));

function getLayer(query, color, opacity) {

    console.log(multiTypeStyle(color, opacity));
    return {
        type: 'mapnik',
        options: {
            sql: layerQueryTemplate({ _query: query } ),
            cartocss: multiTypeStyle(color, opacity),
            cartocss_version: '2.3.0'
        }
    };
}

MapConfigAnalysisLayersAdapter.prototype.getLayers = function(username, requestMapConfig, callback) {

    function adaptLayer(layer, done) {
        if (isAnalysisTypeLayer(layer)) {

            var analysisDefinition = JSON.parse(layer.options.def);
            console.log(JSON.stringify(analysisDefinition, null, 2));

            camshaft.create(username, analysisDefinition, function(err, analysis) {
                if (err) {
                    return done(err);
                }

                var layers = [];

                analysis.getSortedNodes().reverse().forEach(function(node) {
                    layers.push(getLayer(node.getQuery(), 'grey', 0.2));
                });

                layers.push(getLayer(analysis.getQuery()));

                return done(null, { layers: layers });
            });
        } else {
            return done(null, { layers: [layer] });
        }
    }

    function layersAdaptQueueFinish(err, layersResults) {
        if (err) {
            return callback(err);
        }

        if (!layersResults || layersResults.length === 0) {
            return callback(new Error('Missing layers array from layergroup config'));
        }

        var layers = [];
        layersResults.forEach(function(layersResult) {
            layers = layers.concat(layersResult.layers);
        });

        requestMapConfig.layers = layers;

        return callback(null, requestMapConfig);
    }

    var adaptLayersQueue = queue(requestMapConfig.layers.length);

    if (_.some(requestMapConfig.layers, isAnalysisTypeLayer)) {
        requestMapConfig.layers.forEach(function(layer) {
            adaptLayersQueue.defer(adaptLayer, layer);
        });
        adaptLayersQueue.awaitAll(layersAdaptQueueFinish);
    } else {
        return callback(null, requestMapConfig);
    }
};

function isAnalysisTypeLayer(layer) {
    return layer.type === 'analysis';
}