describe('iD.rendererBackgroundSource', function() {
    it('does not error with blank template', function() {
        var source = iD.rendererBackgroundSource({ template: '' });
        expect(source.url([0,1,2])).to.equal('');
    });

    it('supports tms replacement tokens', function() {
        var source = iD.rendererBackgroundSource({
            type: 'tms',
            template: '{z}/{x}/{y}'
        });
        expect(source.url([0,1,2])).to.equal('2/0/1');
    });

    it('supports wms replacement tokens', function() {
        var source = iD.rendererBackgroundSource({
            type: 'wms',
            projection: 'EPSG:3857',
            template: 'SRS={proj}&FORMAT=image/jpeg&WIDTH={width}&HEIGHT={height}&BBOX={bbox}'
        });

        var result = iD.utilStringQs(source.url([0,1,2]));
        expect(result.SRS).to.equal('EPSG:3857');
        expect(result.FORMAT).to.equal('image/jpeg');
        expect(result.WIDTH).to.equal('256');
        expect(result.HEIGHT).to.equal('256');

        var bbox = result.BBOX.split(',');
        expect(+bbox[0]).to.be.closeTo(-20037508.34, 1e-3);
        expect(+bbox[1]).to.be.closeTo(0, 1e-3);
        expect(+bbox[2]).to.be.closeTo(-10018754.17, 1e-3);
        expect(+bbox[3]).to.be.closeTo(10018754.17, 1e-3);
    });

    it('supports subdomains', function() {
        var source = iD.rendererBackgroundSource({ template: '{switch:a,b}/{z}/{x}/{y}'});
        expect(source.url([0,1,2])).to.equal('b/2/0/1');
    });

    it('distributes requests between subdomains', function() {
        var source = iD.rendererBackgroundSource({ template: '{switch:a,b}/{z}/{x}/{y}' });
        expect(source.url([0,1,1])).to.equal('b/1/0/1');
        expect(source.url([0,2,1])).to.equal('a/1/0/2');
    });

    it('correctly displays an overlay with no overzoom specified', function() {
        var source = iD.rendererBackgroundSource({ zoomExtent: [6,16] });
        expect(source.validZoom(10)).to.be.true;
        expect(source.validZoom(3)).to.be.false;
        expect(source.validZoom(17)).to.be.true;
    });

    it('correctly displays an overlay with an invalid overzoom', function() {
        var source = iD.rendererBackgroundSource({ zoomExtent: [6,16], overzoom: 'gibberish'});
        expect(source.validZoom(10)).to.be.true;
        expect(source.validZoom(3)).to.be.false;
        expect(source.validZoom(17)).to.be.true;
    });

    it('correctly displays an overlay with overzoom:true', function() {
        var source = iD.rendererBackgroundSource({ zoomExtent: [6,16], overzoom: true});
        expect(source.validZoom(10)).to.be.true;
        expect(source.validZoom(3)).to.be.false;
        expect(source.validZoom(17)).to.be.true;
    });

    it('correctly displays an overlay with overzoom:false', function() {
        var source = iD.rendererBackgroundSource({ zoomExtent: [6,16], overzoom: false});
        expect(source.validZoom(10)).to.be.true;
        expect(source.validZoom(3)).to.be.false;
        expect(source.validZoom(17)).to.be.false;
    });
});