'use strict';

require('../../support/test-helper');

var assert = require('../../support/assert');
var TestClient = require('../../support/test-client');
const serverOptions = require('../../../lib/server-options');

const suites = [
    {
        desc: 'mvt (mapnik)',
        usePostGIS: false
    },
    {
        desc: 'mvt (postgis)',
        usePostGIS: true
    }
];

suites.forEach(({desc, usePostGIS}) => {
describe(`[${desc}] Create mapnik layergroup`, function() {
    const originalUsePostGIS = serverOptions.renderer.mvt.usePostGIS;

    before(function() {
        serverOptions.renderer.mvt.usePostGIS = usePostGIS;
        this.layerStatsConfig = global.environment.enabledFeatures.layerStats;
        global.environment.enabledFeatures.layerStats = true;
    });

    after(function() {
        serverOptions.renderer.mvt.usePostGIS = originalUsePostGIS;
        global.environment.enabledFeatures.layerStats = this.layerStatsConfig;
    });

    var cartocssVersion = '2.3.0';
    var cartocss = '#layer { line-width:16; }';

    var mapnikLayer1 = {
        type: 'mapnik',
        options: {
            sql: 'select * from test_table limit 1',
            cartocss_version: cartocssVersion,
            cartocss: cartocss
        }
    };

    var mapnikLayer2 = {
        type: 'mapnik',
        options: {
            sql: 'select * from test_table_2 limit 2',
            cartocss_version: cartocssVersion,
            cartocss: cartocss
        }
    };

    var mapnikLayer3 = {
        type: 'mapnik',
        options: {
            sql: 'select * from test_table_3 limit 3',
            cartocss_version: cartocssVersion,
            cartocss: cartocss
        }
    };

    var mapnikLayer4 = {
        type: 'mapnik',
        options: {
            sql: [
                'select t1.cartodb_id, t1.the_geom, t1.the_geom_webmercator, t2.address',
                ' from test_table t1, test_table_2 t2',
                ' where t1.cartodb_id = t2.cartodb_id'
            ].join(''),
            cartocss_version: cartocssVersion,
            cartocss: cartocss
        }
    };

    var mapnikLayer100 = {
        type: 'mapnik',
        options: {
            sql: [
                'SELECT * FROM test_table_100'
            ].join(''),
            cartocss_version: cartocssVersion,
            cartocss: cartocss
        }
    };

    var httpLayer = {
        type: 'http',
        options: {
            urlTemplate: 'http://{s}.basemaps.cartocdn.com/dark_nolabels/{z}/{x}/{y}.png',
            subdomains: ['a','b','c']
        }
    };

    var mapnikLayerGeomColumn = {
        type: 'mapnik',
        options: {
            sql: 'select *, the_geom as my_geom from test_table_3 limit 2',
            geom_column: 'my_geom',
            cartocss_version: cartocssVersion,
            cartocss: cartocss
        }
    };

    var mapnikLayerNullCats = {
        type: 'mapnik',
        options: {
            sql: `
              WITH geom AS (
                SELECT
                  'SRID=4326;POINT(0 0)'::geometry AS the_geom,
                  'SRID=3857;POINT(0 0)'::geometry AS the_geom_webmercator
              )
              SELECT 1 AS cartodb_id, 'A' As cat, geom.* FROM geom
              UNION
              SELECT 2 AS cartodb_id, 'B' As cat, geom.* FROM geom
              UNION
              SELECT 2 AS cartodb_id, NULL::text As cat, geom.* FROM geom
            `,
            cartocss_version: cartocssVersion,
            cartocss: cartocss
        }
    };

    function mapnikBasicLayerId(index) {
        return 'layer' + index;
    }
    function typeLayerId(type, index) {
        return type + '-' + mapnikBasicLayerId(index);
    }

    it('with one mapnik layer should response with meta-stats for that layer', function(done) {
        var testClient = new TestClient({
            version: '1.4.0',
            layers: [
                mapnikLayer1
            ]
        });

        testClient.getLayergroup(function(err, layergroup) {
            assert.ifError(err);
            assert.equal(layergroup.metadata.layers[0].id, mapnikBasicLayerId(0));
            assert.equal(layergroup.metadata.layers[0].meta.stats.estimatedFeatureCount, 1);
            testClient.drain(done);
        });
    });

    it('with two mapnik layer should response with meta-stats for every layer', function(done) {
        var testClient = new TestClient({
            version: '1.4.0',
            layers: [
                mapnikLayer1,
                mapnikLayer2
            ]
        });

        testClient.getLayergroup(function(err, layergroup) {
            assert.ifError(err);
            assert.equal(layergroup.metadata.layers[0].id, mapnikBasicLayerId(0));
            assert.equal(layergroup.metadata.layers[0].meta.stats.estimatedFeatureCount, 1);
            assert.equal(layergroup.metadata.layers[1].id, mapnikBasicLayerId(1));
            assert.equal(layergroup.metadata.layers[1].meta.stats.estimatedFeatureCount, 2);
            testClient.drain(done);
        });
    });

    it('with three mapnik layer should response with meta-stats for every layer', function(done) {
        var testClient = new TestClient({
            version: '1.4.0',
            layers: [
                mapnikLayer1,
                mapnikLayer2,
                mapnikLayer3
            ]
        });

        testClient.getLayergroup(function(err, layergroup) {
            assert.ifError(err);
            assert.equal(layergroup.metadata.layers[0].id, mapnikBasicLayerId(0));
            assert.equal(layergroup.metadata.layers[0].meta.stats.estimatedFeatureCount, 1);
            assert.equal(layergroup.metadata.layers[1].id, mapnikBasicLayerId(1));
            assert.equal(layergroup.metadata.layers[1].meta.stats.estimatedFeatureCount, 2);
            assert.equal(layergroup.metadata.layers[2].id, mapnikBasicLayerId(2));
            assert.equal(layergroup.metadata.layers[2].meta.stats.estimatedFeatureCount, 3);
            testClient.drain(done);
        });
    });

    it('with one mapnik layer (sql with join) should response with meta-stats for that layer', function(done) {
        var testClient = new TestClient({
            version: '1.4.0',
            layers: [
                mapnikLayer4
            ]
        });

        testClient.getLayergroup(function(err, layergroup) {
            assert.ifError(err);
            assert.equal(layergroup.metadata.layers[0].id, mapnikBasicLayerId(0));
            assert.equal(layergroup.metadata.layers[0].meta.stats.estimatedFeatureCount, 5);
            testClient.drain(done);
        });
    });

    it('with two mapnik layer (sql with join) should response with meta-stats for every layer', function(done) {
        var testClient = new TestClient({
            version: '1.4.0',
            layers: [
                mapnikLayer4,
                mapnikLayer4
            ]
        });

        testClient.getLayergroup(function(err, layergroup) {
            assert.ifError(err);
            assert.equal(layergroup.metadata.layers[0].id, mapnikBasicLayerId(0));
            assert.equal(layergroup.metadata.layers[0].meta.stats.estimatedFeatureCount, 5);
            assert.equal(layergroup.metadata.layers[1].id, mapnikBasicLayerId(1));
            assert.equal(layergroup.metadata.layers[1].meta.stats.estimatedFeatureCount, 5);
            testClient.drain(done);
        });
    });

    it('with two mapnik layer (with & without join) should response with meta-stats for every layer', function(done) {
        var testClient = new TestClient({
            version: '1.4.0',
            layers: [
                mapnikLayer3,
                mapnikLayer4
            ]
        });

        testClient.getLayergroup(function(err, layergroup) {
            assert.ifError(err);
            assert.equal(layergroup.metadata.layers[0].id, mapnikBasicLayerId(0));
            assert.equal(layergroup.metadata.layers[0].meta.stats.estimatedFeatureCount, 3);
            assert.ok(!layergroup.metadata.layers[0].meta.stats[1]);
            assert.equal(layergroup.metadata.layers[1].id, mapnikBasicLayerId(1));
            assert.equal(layergroup.metadata.layers[1].meta.stats.estimatedFeatureCount, 5);
            assert.ok(!layergroup.metadata.layers[2]);
            testClient.drain(done);
        });
    });

    it('with mapnik and layer and httplayer should response with layer metadata with same order', function(done) {
        var testClient = new TestClient({
            version: '1.4.0',
            layers: [
                mapnikLayer1,
                httpLayer
            ]
        });

        testClient.getLayergroup(function(err, layergroup) {
            assert.ifError(err);
            assert.equal(layergroup.metadata.layers[0].id, mapnikBasicLayerId(0));
            assert.equal(layergroup.metadata.layers[0].type, 'mapnik');
            assert.equal(layergroup.metadata.layers[0].meta.stats.estimatedFeatureCount, 1);
            assert.equal(layergroup.metadata.layers[1].id, typeLayerId('http', 0));
            assert.equal(layergroup.metadata.layers[1].type, 'http');
            testClient.drain(done);
        });
    });

    it('with httpLayer and mapnik layer should response with layer metadata with same order', function(done) {
        var testClient = new TestClient({
            version: '1.4.0',
            layers: [
                httpLayer,
                mapnikLayer1
            ]
        });

        testClient.getLayergroup(function (err, layergroup) {
            assert.ifError(err);
            assert.equal(layergroup.metadata.layers[0].id, typeLayerId('http', 0));
            assert.equal(layergroup.metadata.layers[0].type, 'http');
            assert.ok(!layergroup.metadata.layers[0].meta.cartocss);
            assert.equal(layergroup.metadata.layers[1].meta.stats.estimatedFeatureCount, 1);
            assert.equal(layergroup.metadata.layers[1].id, mapnikBasicLayerId(0));
            assert.equal(layergroup.metadata.layers[1].type, 'mapnik');
            assert.equal(layergroup.metadata.layers[1].meta.cartocss, cartocss);
            testClient.drain(done);
        });
    });

    it('should work with different geom_column', function(done) {
        var testClient = new TestClient({
            version: '1.4.0',
            layers: [
                mapnikLayerGeomColumn
            ]
        });

        testClient.getLayergroup(function(err, layergroup) {
            assert.ifError(err);
            assert.equal(layergroup.metadata.layers[0].id, mapnikBasicLayerId(0));
            // we don't care about stats here as is an aliased column
            assert.ok(layergroup.metadata.layers[0].meta.stats.hasOwnProperty('estimatedFeatureCount'));
            testClient.drain(done);
        });
    });

    it('should not include the stats part if the FF is disabled', function(done) {
        global.environment.enabledFeatures.layerStats = false;
        var testClient = new TestClient({
            version: '1.4.0',
            layers: [
                httpLayer,
                mapnikLayer1,
                httpLayer
            ]
        });

        testClient.getLayergroup(function(err, layergroup) {
            assert.ifError(err);
            assert.equal(layergroup.metadata.layers[0].id, typeLayerId('http', 0));
            assert.equal(layergroup.metadata.layers[0].type, 'http');
            assert.equal(layergroup.metadata.layers[1].id, mapnikBasicLayerId(0));
            assert.equal(layergroup.metadata.layers[1].type, 'mapnik');
            assert.ok(!layergroup.metadata.layers[1].meta.hasOwnProperty('stats'));
            assert.equal(layergroup.metadata.layers[2].id, typeLayerId('http', 1));
            assert.equal(layergroup.metadata.layers[2].type, 'http');
            global.environment.enabledFeatures.layerStats = true;
            testClient.drain(done);
        });
    });

    function layerWithMetadata(layer, metadata) {
        return Object.assign(layer, {
            options: Object.assign(layer.options, { metadata })
        });
    }

    it('should provide columns as optional metadata', function(done) {
        var testClient = new TestClient({
            version: '1.4.0',
            layers: [
                layerWithMetadata(mapnikLayer4, {
                    columns: true
                })
            ]
        });

        testClient.getLayergroup(function(err, layergroup) {
            assert.ifError(err);
            assert.equal(layergroup.metadata.layers[0].id, mapnikBasicLayerId(0));
            assert.equal(layergroup.metadata.layers[0].meta.stats.estimatedFeatureCount, 5);
            const expectedColumns = {
                cartodb_id: { type: 'number' },
                the_geom: { type: 'geometry' },
                the_geom_webmercator: { type: 'geometry' },
                address: { type: 'string' }
            };
            assert.deepEqual(layergroup.metadata.layers[0].meta.stats.columns, expectedColumns);
            testClient.drain(done);
        });
    });

    // metadata categories are ordered only partially by descending frequency;
    // this orders them completely to avoid ambiguities when comparing
    function withSortedCategories(columns) {
        function catOrder(a, b) {
            if (a.frequency !== b.frequency) {
                return b.frequency - a.frequency;
            }
            if (a.category < b.category) {
                return -1;
            }
            if (a.category > b.category) {
                return +1;
            }
            return 0;
        }
        let sorted = {};
        Object.keys(columns).forEach(name => {
            let data = columns[name];
            if (data.hasOwnProperty('categories')) {
                data = Object.assign(data, { categories: data.categories.sort(catOrder)});
            }
            sorted[name] = data;
        });
        return sorted;
    }

    it('should provide column stats as optional metadata', function(done) {
        var testClient = new TestClient({
            version: '1.4.0',
            layers: [
                layerWithMetadata(mapnikLayer4, {
                    columnStats: true
                })
            ]
        });

        testClient.getLayergroup(function(err, layergroup) {
            assert.ifError(err);
            assert.equal(layergroup.metadata.layers[0].id, mapnikBasicLayerId(0));
            assert.equal(layergroup.metadata.layers[0].meta.stats.estimatedFeatureCount, 5);
            const expectedColumns = {
                cartodb_id: {
                    type: 'number',
                    avg: 3,
                    max: 5,
                    min: 1,
                    sum: 15
                },
                the_geom: { type: 'geometry' },
                the_geom_webmercator: { type: 'geometry' },
                address: {
                    type: 'string',
                    categories: [
                        {
                            category: "Calle de la Palma 72, Madrid, Spain",
                            frequency: 1
                        },
                        {
                            category: "Calle de Pérez Galdós 9, Madrid, Spain",
                            frequency: 1
                        },
                        {
                            category: "Calle Divino Pastor 12, Madrid, Spain",
                            frequency: 1
                        },
                        {
                            category: "Manuel Fernández y González 8, Madrid, Spain",
                            frequency: 1
                        },
                        {
                            category: "Plaza Conde de Toreno 2, Madrid, Spain",
                            frequency: 1
                        }
                    ]
                }
            };
            assert.deepEqual(
                withSortedCategories(layergroup.metadata.layers[0].meta.stats.columns),
                withSortedCategories(expectedColumns)
            );
            testClient.drain(done);
        });
    });

    it('should limit the number of categories as requested', function(done) {
        var testClient = new TestClient({
            version: '1.4.0',
            layers: [
                layerWithMetadata(mapnikLayer4, {
                    columnStats: { topCategories: 2 }
                })
            ]
        });

        testClient.getLayergroup(function(err, layergroup) {
            assert.ifError(err);
            assert.equal(layergroup.metadata.layers[0].id, mapnikBasicLayerId(0));
            const columnsMetadata = layergroup.metadata.layers[0].meta.stats.columns;
            assert.equal(columnsMetadata.address.categories.length, 2);
            testClient.drain(done);
        });
    });

    it('should include null categories if requested', function(done) {
        var testClient = new TestClient({
            version: '1.4.0',
            layers: [
                layerWithMetadata(mapnikLayerNullCats, {
                    columnStats: { includeNulls: true }
                })
            ]
        });

        testClient.getLayergroup(function(err, layergroup) {
            assert.ifError(err);
            assert.equal(layergroup.metadata.layers[0].id, mapnikBasicLayerId(0));
            const columnsMetadata = layergroup.metadata.layers[0].meta.stats.columns;
            assert.equal(columnsMetadata.cat.categories.length, 3);
            testClient.drain(done);
        });
    });

    it('should not include null categories if not requested', function(done) {
        var testClient = new TestClient({
            version: '1.4.0',
            layers: [
                layerWithMetadata(mapnikLayerNullCats, {
                    columnStats: { includeNulls: false }
                })
            ]
        });

        testClient.getLayergroup(function(err, layergroup) {
            assert.ifError(err);
            assert.equal(layergroup.metadata.layers[0].id, mapnikBasicLayerId(0));
            const columnsMetadata = layergroup.metadata.layers[0].meta.stats.columns;
            assert.equal(columnsMetadata.cat.categories.length, 2);
            testClient.drain(done);
        });
    });

    it('should provide row count as optional metadata', function(done) {
        var testClient = new TestClient({
            version: '1.4.0',
            layers: [
                layerWithMetadata(mapnikLayer4, {
                    featureCount: true
                })
            ]
        });

        testClient.getLayergroup(function(err, layergroup) {
            assert.ifError(err);
            assert.equal(layergroup.metadata.layers[0].id, mapnikBasicLayerId(0));
            assert.equal(layergroup.metadata.layers[0].meta.stats.estimatedFeatureCount, 5);
            assert.equal(layergroup.metadata.layers[0].meta.stats.featureCount, 5);
            testClient.drain(done);
        });
    });

    it('should provide geometry type as optional metadata', function(done) {
        var testClient = new TestClient({
            version: '1.4.0',
            layers: [
                layerWithMetadata(mapnikLayer4, {
                    geometryType: true
                })
            ]
        });

        testClient.getLayergroup(function(err, layergroup) {
            assert.ifError(err);
            assert.equal(layergroup.metadata.layers[0].id, mapnikBasicLayerId(0));
            assert.equal(layergroup.metadata.layers[0].meta.stats.estimatedFeatureCount, 5);
            assert.equal(layergroup.metadata.layers[0].meta.stats.geometryType, 'ST_Point');
            testClient.drain(done);
        });
    });

    it(`should not fail "TypeError: ... 'geom_type' of undefined" for empty results`, function(done) {
        var testClient = new TestClient({
            version: '1.8.0',
            layers: [
                {
                    type: 'mapnik',
                    options: {
                        sql: 'select * from test_table where false',
                        metadata: {
                            geometryType: true
                        }
                    }
                }
            ]
        });

        testClient.getLayergroup(function(err, layergroup) {
            assert.ifError(err);
            assert.equal(layergroup.metadata.layers[0].id, mapnikBasicLayerId(0));
            assert.equal(layergroup.metadata.layers[0].meta.stats.geometryType, undefined);
            testClient.drain(done);
        });
    });

    it('should provide a sample as optional metadata', function(done) {
        var testClient = new TestClient({
            version: '1.4.0',
            layers: [
                layerWithMetadata(mapnikLayer100, {
                    sample: { num_rows: 30 }
                })
            ]
        });

        testClient.getLayergroup(function(err, layergroup) {
            assert.ifError(err);
            assert.equal(layergroup.metadata.layers[0].id, mapnikBasicLayerId(0));
            assert.equal(layergroup.metadata.layers[0].meta.stats.estimatedFeatureCount, 100);
            assert(layergroup.metadata.layers[0].meta.stats.sample.length > 0);
            const expectedCols = [ 'cartodb_id', 'value', 'the_geom', 'the_geom_webmercator' ].sort();
            assert.deepEqual(Object.keys(layergroup.metadata.layers[0].meta.stats.sample[0]).sort(), expectedCols);
            testClient.drain(done);
        });
    });

    it('should not provide a sample when the source table is empty', function (done) {
        var testClient = new TestClient({
            version: "1.4.0",
            layers: [
                {
                    type: "mapnik",
                    options: {
                        sql: "SELECT * FROM test_table_100 limit 0",
                        cartocss_version: "2.3.0",
                        cartocss: "#layer { line-width:16; }",
                        metadata: {
                            sample: {
                                num_rows: 30
                            }
                        }
                    }
                }
            ]
        });

        testClient.getLayergroup(function(err, layergroup) {
            assert.ifError(err);
            assert.deepStrictEqual(layergroup.metadata.layers[0].meta.stats.sample, {});
            testClient.drain(done);
        });
    });

    it('can specify sample columns', function(done) {
        var testClient = new TestClient({
            version: '1.4.0',
            layers: [
                layerWithMetadata(mapnikLayer100, {
                    sample: {
                        num_rows: 30,
                        include_columns:  [ 'cartodb_id', 'the_geom' ]
                    }
                })
            ]
        });

        testClient.getLayergroup(function(err, layergroup) {
            assert.ifError(err);
            assert.equal(layergroup.metadata.layers[0].id, mapnikBasicLayerId(0));
            assert.equal(layergroup.metadata.layers[0].meta.stats.estimatedFeatureCount, 100);
            assert(layergroup.metadata.layers[0].meta.stats.sample.length > 0);
            const expectedCols = [ 'cartodb_id', 'the_geom' ].sort();
            assert.deepEqual(Object.keys(layergroup.metadata.layers[0].meta.stats.sample[0]).sort(), expectedCols);
            testClient.drain(done);
        });
    });


    it('should only provide requested optional metadata', function(done) {
        var testClient = new TestClient({
            version: '1.4.0',
            layers: [
                layerWithMetadata(mapnikLayer4, {
                    geometryType: true,
                    featureCount: true
                })
            ]
        });

        testClient.getLayergroup(function(err, layergroup) {
            assert.ifError(err);
            assert.equal(layergroup.metadata.layers[0].id, mapnikBasicLayerId(0));
            assert.equal(layergroup.metadata.layers[0].meta.stats.estimatedFeatureCount, 5);
            assert.equal(layergroup.metadata.layers[0].meta.stats.geometryType, 'ST_Point');
            assert.equal(layergroup.metadata.layers[0].meta.stats.featureCount, 5);
            assert.equal(layergroup.metadata.layers[0].meta.stats.sample, undefined);
            assert.equal(layergroup.metadata.layers[0].meta.stats.columns, undefined);
            testClient.drain(done);
        });
    });

});
});