import _map from 'lodash-es/map';
import _values from 'lodash-es/values';

import { bisector as d3_bisector } from 'd3-array';

import { osmEntity, osmIsSimpleMultipolygonOuterMember } from '../osm';
import { svgPath, svgSegmentWay, svgTagClasses } from './index';


export function svgAreas(projection, context) {
    // Patterns only work in Firefox when set directly on element.
    // (This is not a bug: https://bugzilla.mozilla.org/show_bug.cgi?id=750632)
    var patterns = {
        // tag - pattern name
        // -or-
        // tag - value - pattern name
        // -or-
        // tag - value - rules (optional tag-values, pattern name)
        // (matches earlier rules first, so fallback should be last entry)
        amenity: {
            grave_yard: 'cemetery',
            fountain: 'water_standing'
        },
        landuse: {
            cemetery: [
                { religion: 'christian', pattern: 'cemetery_christian' },
                { religion: 'buddhist', pattern: 'cemetery_buddhist' },
                { religion: 'muslim', pattern: 'cemetery_muslim' },
                { religion: 'jewish', pattern: 'cemetery_jewish' },
                { pattern: 'cemetery' }
            ],
            construction: 'construction',
            farmland: 'farmland',
            farmyard: 'farmyard',
            forest: [
                { leaf_type: 'broadleaved', pattern: 'forest_broadleaved' },
                { leaf_type: 'needleleaved', pattern: 'forest_needleleaved' },
                { leaf_type: 'leafless', pattern: 'forest_leafless' },
                { pattern: 'forest' } // same as 'leaf_type:mixed'
            ],
            grave_yard: 'cemetery',
            grass: 'grass',
            landfill: 'landfill',
            meadow: 'meadow',
            military: 'construction',
            orchard: 'orchard',
            reservoir: 'water_standing',
            quarry: 'quarry',
            vineyard: 'vineyard'
        },
        natural: {
            beach: 'beach',
            grassland: 'grass',
            sand: 'beach',
            scrub: 'scrub',
            water: [
                { water: 'pond', pattern: 'pond' },
                { water: 'reservoir', pattern: 'water_standing' },
                { pattern: 'waves' }
            ],
            wetland: [
                { wetland: 'marsh', pattern: 'wetland_marsh' },
                { wetland: 'swamp', pattern: 'wetland_swamp' },
                { wetland: 'bog', pattern: 'wetland_bog' },
                { wetland: 'reedbed', pattern: 'wetland_reedbed' },
                { pattern: 'wetland' }
            ],
            wood: [
                { leaf_type: 'broadleaved', pattern: 'forest_broadleaved' },
                { leaf_type: 'needleleaved', pattern: 'forest_needleleaved' },
                { leaf_type: 'leafless', pattern: 'forest_leafless' },
                { pattern: 'forest' } // same as 'leaf_type:mixed'
            ]
        },
        traffic_calming: {
            island: [
                { surface: 'grass', pattern: 'grass' },
            ],
            chicane: [
                { surface: 'grass', pattern: 'grass' },
            ],
            choker: [
                { surface: 'grass', pattern: 'grass' },
            ]
        }
    };

    function setPattern(entity) {
        // Skip pattern filling if this is a building (buildings don't get patterns applied)
        if (entity.tags.building && entity.tags.building !== 'no') {
            this.style.fill = this.style.stroke = '';
            return;
        }

        for (var tag in patterns) {
            var entityValue = entity.tags[tag];
            if (!entityValue) continue;

            if (typeof patterns[tag] === 'string') { // extra short syntax (just tag) - pattern name
                this.style.fill = this.style.stroke = 'url("#pattern-' + patterns[tag] + '")';
                return;
            } else {
                var values = patterns[tag];
                for (var value in values) {
                    if (entityValue !== value) continue;

                    var rules = values[value];
                    if (typeof rules === 'string') { // short syntax - pattern name
                        this.style.fill = this.style.stroke = 'url("#pattern-' + rules + '")';
                        return;
                    } else { // long syntax - rule array
                        for (var ruleKey in rules) {
                            var rule = rules[ruleKey];

                            var pass = true;
                            for (var criterion in rule) {
                                if (criterion !== 'pattern') { // reserved for pattern name
                                    // The only rule is a required tag-value pair
                                    var v = entity.tags[criterion];
                                    if (!v || v !== rule[criterion]) {
                                        pass = false;
                                        break;
                                    }
                                }
                            }

                            if (pass) {
                                this.style.fill = this.style.stroke = 'url("#pattern-' + rule.pattern + '")';
                                return;
                            }
                        }
                    }
                }
            }
        }

        this.style.fill = this.style.stroke = '';
    }


    function drawTargets(selection, graph, entities, filter) {
        var targetClass = context.getDebug('target') ? 'pink ' : 'nocolor ';
        var nopeClass = context.getDebug('target') ? 'red ' : 'nocolor ';
        var getPath = svgPath(projection).geojson;
        var activeID = context.activeID();

        // The targets and nopes will be MultiLineString sub-segments of the ways
        var data = { targets: [], nopes: [] };

        entities.forEach(function(way) {
            var features = svgSegmentWay(way, graph, activeID);
            data.targets.push.apply(data.targets, features.passive);
            data.nopes.push.apply(data.nopes, features.active);
        });


        // Targets allow hover and vertex snapping
        var targetData = data.targets.filter(getPath);
        var targets = selection.selectAll('.area.target-allowed')
            .filter(function(d) { return filter(d.properties.entity); })
            .data(targetData, function key(d) { return d.id; });

        // exit
        targets.exit()
            .remove();

        // enter/update
        targets.enter()
            .append('path')
            .merge(targets)
            .attr('d', getPath)
            .attr('class', function(d) { return 'way area target target-allowed ' + targetClass + d.id; });


        // NOPE
        var nopeData = data.nopes.filter(getPath);
        var nopes = selection.selectAll('.area.target-nope')
            .filter(function(d) { return filter(d.properties.entity); })
            .data(nopeData, function key(d) { return d.id; });

        // exit
        nopes.exit()
            .remove();

        // enter/update
        nopes.enter()
            .append('path')
            .merge(nopes)
            .attr('d', getPath)
            .attr('class', function(d) { return 'way area target target-nope ' + nopeClass + d.id; });
    }


    function drawAreas(selection, graph, entities, filter) {
        var path = svgPath(projection, graph, true);
        var areas = {};
        var multipolygon;

        for (var i = 0; i < entities.length; i++) {
            var entity = entities[i];
            if (entity.geometry(graph) !== 'area') continue;

            multipolygon = osmIsSimpleMultipolygonOuterMember(entity, graph);
            if (multipolygon) {
                areas[multipolygon.id] = {
                    entity: multipolygon.mergeTags(entity.tags),
                    area: Math.abs(entity.area(graph))
                };
            } else if (!areas[entity.id]) {
                areas[entity.id] = {
                    entity: entity,
                    area: Math.abs(entity.area(graph))
                };
            }
        }

        areas = _values(areas).filter(function hasPath(a) { return path(a.entity); });
        areas.sort(function areaSort(a, b) { return b.area - a.area; });
        areas = _map(areas, 'entity');

        var strokes = areas.filter(function(area) {
            return area.type === 'way';
        });

        var data = {
            clip: areas,
            shadow: strokes,
            stroke: strokes,
            fill: areas
        };

        var clipPaths = context.surface().selectAll('defs').selectAll('.clipPath-osm')
           .filter(filter)
           .data(data.clip, osmEntity.key);

        clipPaths.exit()
           .remove();

        var clipPathsEnter = clipPaths.enter()
           .append('clipPath')
           .attr('class', 'clipPath-osm')
           .attr('id', function(entity) { return entity.id + '-clippath'; });

        clipPathsEnter
           .append('path');

        clipPaths.merge(clipPathsEnter)
           .selectAll('path')
           .attr('d', path);


        var drawLayer = selection.selectAll('.layer-osm.areas');
        var touchLayer = selection.selectAll('.layer-touch.areas');

        // Draw areas..
        var areagroup = drawLayer
            .selectAll('g.areagroup')
            .data(['fill', 'shadow', 'stroke']);

        areagroup = areagroup.enter()
            .append('g')
            .attr('class', function(d) { return 'areagroup area-' + d; })
            .merge(areagroup);

        var paths = areagroup
            .selectAll('path')
            .filter(filter)
            .data(function(layer) { return data[layer]; }, osmEntity.key);

        paths.exit()
            .remove();

        var fills = selection.selectAll('.area-fill path.area').nodes();

        var bisect = d3_bisector(function(node) {
            return -node.__data__.area(graph);
        }).left;

        function sortedByArea(entity) {
            if (this._parent.__data__ === 'fill') {
                return fills[bisect(fills, -entity.area(graph))];
            }
        }

        paths = paths.enter()
            .insert('path', sortedByArea)
            .merge(paths)
            .each(function(entity) {
                var layer = this.parentNode.__data__;
                this.setAttribute('class', entity.type + ' area ' + layer + ' ' + entity.id);

                if (layer === 'fill') {
                    this.setAttribute('clip-path', 'url(#' + entity.id + '-clippath)');
                    setPattern.call(this, entity);
                }
            })
            .call(svgTagClasses())
            .attr('d', path);


        // Draw touch targets..
        touchLayer
            .call(drawTargets, graph, data.stroke, filter);
    }

    return drawAreas;
}