import { utilArrayUniq, utilEditDistance } from '../util';


export function presetCollection(collection) {
    var maxSearchResults = 50;

    var presets = {

        collection: collection,


        item: function(id) {
            return this.collection.find(function(d) {
                return d.id === id;
            });
        },

        index: function(id) {
            return this.collection.findIndex(function(d) {
                return d.id === id;
            });
        },

        matchGeometry: function(geometry) {
            return presetCollection(this.collection.filter(function(d) {
                return d.matchGeometry(geometry);
            }));
        },

        matchAnyGeometry: function(geometries) {
            return presetCollection(this.collection.filter(function(d) {
                return geometries.some(function(geometry) {
                    return d.matchGeometry(geometry);
                });
            }));
        },

        fallback: function(geometry) {
            var id = geometry;
            if (id === 'vertex') id = 'point';
            return this.item(id);
        },

        search: function(value, geometry, countryCode) {
            if (!value) return this;

            value = value.toLowerCase().trim();

            // match at name beginning or just after a space (e.g. "office" -> match "Law Office")
            function leading(a) {
                var index = a.indexOf(value);
                return index === 0 || a[index - 1] === ' ';
            }

            // match at name beginning only
            function leadingStrict(a) {
                var index = a.indexOf(value);
                return index === 0;
            }

            function sortNames(a, b) {
                var aCompare = (a.suggestion ? a.originalName : a.name()).toLowerCase();
                var bCompare = (b.suggestion ? b.originalName : b.name()).toLowerCase();

                // priority if search string matches preset name exactly - #4325
                if (value === aCompare) return -1;
                if (value === bCompare) return 1;

                // priority for higher matchScore
                var i = b.originalScore - a.originalScore;
                if (i !== 0) return i;

                // priority if search string appears earlier in preset name
                i = aCompare.indexOf(value) - bCompare.indexOf(value);
                if (i !== 0) return i;

                // priority for shorter preset names
                return aCompare.length - bCompare.length;
            }

            var pool = this.collection;
            if (countryCode) {
                pool = pool.filter(function(a) {
                    if (!a.countryCodes) return true;
                    return a.countryCodes.indexOf(countryCode) !== -1;
                });
            }
            var searchable = pool.filter(function(a) {
                return a.searchable !== false && a.suggestion !== true;
            });
            var suggestions = pool.filter(function(a) {
                return a.suggestion === true;
            });

            // matches value to preset.name
            var leading_name = searchable
                .filter(function(a) {
                    return leading(a.name().toLowerCase());
                }).sort(sortNames);

            // matches value to preset.terms values
            var leading_terms = searchable
                .filter(function(a) {
                    return (a.terms() || []).some(leading);
                });

            // matches value to preset.tags values
            var leading_tag_values = searchable
                .filter(function(a) {
                    return Object.values(a.tags || {})
                        .filter(function(val) { return val !== '*'; })
                        .some(leading);
                });

            var leading_suggestions = suggestions
                .filter(function(a) {
                    return leadingStrict(a.originalName.toLowerCase());
                }).sort(sortNames);

            // finds close matches to value in preset.name
            var similar_name = searchable
                .map(function(a) {
                    return { preset: a, dist: utilEditDistance(value, a.name()) };
                }).filter(function(a) {
                    return a.dist + Math.min(value.length - a.preset.name().length, 0) < 3;
                }).sort(function(a, b) {
                    return a.dist - b.dist;
                }).map(function(a) {
                    return a.preset;
                });

            // finds close matches to value in preset.terms
            var similar_terms = searchable
                .filter(function(a) {
                    return (a.terms() || []).some(function(b) {
                        return utilEditDistance(value, b) + Math.min(value.length - b.length, 0) < 3;
                    });
                });

            var similar_suggestions = suggestions
                .map(function(a) {
                    return { preset: a, dist: utilEditDistance(value, a.originalName.toLowerCase()) };
                }).filter(function(a) {
                    return a.dist + Math.min(value.length - a.preset.originalName.length, 0) < 1;
                }).sort(function(a, b) {
                    return a.dist - b.dist;
                }).map(function(a) {
                    return a.preset;
                });

            var results = leading_name.concat(
                leading_suggestions,
                leading_terms,
                leading_tag_values,
                similar_name,
                similar_suggestions,
                similar_terms
            ).slice(0, maxSearchResults - 1);

            if (geometry) {
                if (typeof geometry === 'string') {
                    results.push(presets.fallback(geometry));
                } else {
                    geometry.forEach(function(geom) {
                        results.push(presets.fallback(geom));
                    });
                }
            }

            return presetCollection(utilArrayUniq(results));
        }
    };


    return presets;
}