'use strict';

var util = require('util');
var path = require('path');

module.exports = {
    Location: class {
        constructor (lon, lat) {
            this.lon = lon;
            this.lat = lat;
        }
    },

    osmData: class {
        constructor (scope) {
            this.scope          = scope;
            this.str            = null;
            this.hash           = null;
            this.fingerprintOSM = null;
            this.osmFile        = null;
            this.extractedFile  = null;
            this.contractedFile   = null;
        }

        populate (callback) {
            this.scope.OSMDB.toXML((str) => {
                this.str = str;

                this.hash = this.scope.hashString(str);
                this.fingerprintOSM = this.scope.hashString(this.hash);

                this.osmFile        = path.resolve(this.scope.DATA_FOLDER, this.fingerprintOSM);

                this.extractedFile  = path.resolve([this.osmFile, this.scope.fingerprintExtract].join('_'));
                this.contractedFile   = path.resolve([this.osmFile, this.scope.fingerprintExtract, this.scope.fingerprintContract].join('_'));

                callback();
            });
        }

        reset () {
            this.str            = null;
            this.hash           = null;
            this.fingerprintOSM = null;
            this.osmFile        = null;
            this.extractedFile  = null;
            this.contractedFile   = null;
        }
    },

    FuzzyMatch: class {
        match (got, want) {
            var matchPercent = want.match(/(.*)\s+~(.+)%$/),
                matchAbs = want.match(/(.*)\s+\+\-(.+)$/),
                matchRe = want.match(/^\/(.*)\/$/);

            if (got === want) {
                return true;
            } else if (matchPercent) {         // percentage range: 100 ~ 5%
                var target = parseFloat(matchPercent[1]),
                    percentage = parseFloat(matchPercent[2]);
                if (target === 0) {
                    return true;
                } else {
                    var ratio = Math.abs(1 - parseFloat(got) / target);
                    return 100 * ratio < percentage;
                }
            } else if (matchAbs) {             // absolute range: 100 +-5
                var margin = parseFloat(matchAbs[2]),
                    fromR = parseFloat(matchAbs[1]) - margin,
                    toR = parseFloat(matchAbs[1]) + margin;
                return parseFloat(got) >= fromR && parseFloat(got) <= toR;
            } else if (matchRe) {               // regex: /a,b,.*/
                return got.match(matchRe[1]);
            } else {
                return false;
            }
        }

        matchLocation (got, want) {
            return this.match(got[0], util.format('%d ~0.0025%', want.lon)) &&
                this.match(got[1], util.format('%d ~0.0025%', want.lat));
        }
    }
};