describe('iD.util', function() {

    describe('utilGetAllNodes', function() {
        it('gets all descendant nodes of a way', function() {
            var a = iD.Node({ id: 'a' }),
                b = iD.Node({ id: 'b' }),
                w = iD.Way({ id: 'w', nodes: ['a','b','a'] }),
                graph = iD.Graph([a, b, w]),
                result = iD.utilGetAllNodes(['w'], graph);

            expect(result).to.have.members([a, b]);
            expect(result).to.have.lengthOf(2);
        });

        it('gets all descendant nodes of a relation', function() {
            var a = iD.Node({ id: 'a' }),
                b = iD.Node({ id: 'b' }),
                c = iD.Node({ id: 'c' }),
                w = iD.Way({ id: 'w', nodes: ['a','b','a'] }),
                r = iD.Relation({ id: 'r', members: [{id: 'w'}, {id: 'c'}] }),
                graph = iD.Graph([a, b, c, w, r]),
                result = iD.utilGetAllNodes(['r'], graph);

            expect(result).to.have.members([a, b, c]);
            expect(result).to.have.lengthOf(3);
        });

        it('gets all descendant nodes of multiple ids', function() {
            var a = iD.Node({ id: 'a' }),
                b = iD.Node({ id: 'b' }),
                c = iD.Node({ id: 'c' }),
                d = iD.Node({ id: 'd' }),
                e = iD.Node({ id: 'e' }),
                w1 = iD.Way({ id: 'w1', nodes: ['a','b','a'] }),
                w2 = iD.Way({ id: 'w2', nodes: ['c','b','a','c'] }),
                r = iD.Relation({ id: 'r', members: [{id: 'w1'}, {id: 'd'}] }),
                graph = iD.Graph([a, b, c, d, e, w1, w2, r]),
                result = iD.utilGetAllNodes(['r', 'w2', 'e'], graph);

            expect(result).to.have.members([a, b, c, d, e]);
            expect(result).to.have.lengthOf(5);
        });

        it('handles recursive relations', function() {
            var a = iD.Node({ id: 'a' }),
                r1 = iD.Relation({ id: 'r1', members: [{id: 'r2'}] }),
                r2 = iD.Relation({ id: 'r2', members: [{id: 'r1'}, {id: 'a'}] }),
                graph = iD.Graph([a, r1, r2]),
                result = iD.utilGetAllNodes(['r1'], graph);

            expect(result).to.have.members([a]);
            expect(result).to.have.lengthOf(1);
        });
    });

    it('utilTagText', function() {
        expect(iD.utilTagText({})).to.eql('');
        expect(iD.utilTagText({tags:{foo:'bar'}})).to.eql('foo=bar');
        expect(iD.utilTagText({tags:{foo:'bar',two:'three'}})).to.eql('foo=bar, two=three');
    });

    it('utilStringQs', function() {
        expect(iD.utilStringQs('foo=bar')).to.eql({foo: 'bar'});
        expect(iD.utilStringQs('foo=bar&one=2')).to.eql({foo: 'bar', one: '2' });
        expect(iD.utilStringQs('')).to.eql({});
    });

    it('utilQsString', function() {
        expect(iD.utilQsString({ foo: 'bar' })).to.eql('foo=bar');
        expect(iD.utilQsString({ foo: 'bar', one: 2 })).to.eql('foo=bar&one=2');
        expect(iD.utilQsString({})).to.eql('');
    });

    it('utilGetPrototypeOf', function() {
        var a = function() {};
        a.prototype = { foo: 'foo' };
        expect(iD.utilGetPrototypeOf({})).to.eql({});
        expect(iD.utilGetPrototypeOf(new a())).to.eql({ foo: 'foo' });
    });

    describe('utilEditDistance', function() {
        it('returns zero for same strings', function() {
            expect(iD.utilEditDistance('foo', 'foo')).to.eql(0);
        });

        it('reports an insertion of 1', function() {
            expect(iD.utilEditDistance('foo', 'fooa')).to.eql(1);
        });

        it('reports a replacement of 1', function() {
            expect(iD.utilEditDistance('foob', 'fooa')).to.eql(1);
        });

        it('does not fail on empty input', function() {
            expect(iD.utilEditDistance('', '')).to.eql(0);
        });
    });

    describe('utilAsyncMap', function() {
        it('handles correct replies', function() {
            iD.utilAsyncMap([1, 2, 3],
                function(d, c) { c(null, d * 2); },
                function(err, res) {
                    expect(err).to.eql([null, null, null]);
                    expect(res).to.eql([2, 4, 6]);
                });
        });
        it('handles errors', function() {
            iD.utilAsyncMap([1, 2, 3],
                function(d, c) { c('whoops ' + d, null); },
                function(err, res) {
                    expect(err).to.eql(['whoops 1', 'whoops 2', 'whoops 3']);
                    expect(res).to.eql([null, null, null]);
                });
        });
    });
});