describe("iD.Tree", function() {
    describe("#rebase", function() {
        it("adds entities to the tree", function() {
            var graph = iD.Graph(),
                tree = iD.Tree(graph),
                node = iD.Node({id: 'n', loc: [1, 1]});

            graph.rebase([node], [graph]);
            tree.rebase([node]);

            expect(tree.intersects(iD.geo.Extent([0, 0], [2, 2]), graph)).to.eql([node]);
        });

        it("is idempotent", function() {
            var graph = iD.Graph(),
                tree = iD.Tree(graph),
                node = iD.Node({id: 'n', loc: [1, 1]}),
                extent = iD.geo.Extent([0, 0], [2, 2]);

            graph.rebase([node], [graph]);
            tree.rebase([node]);
            expect(tree.intersects(extent, graph)).to.eql([node]);

            graph.rebase([node], [graph]);
            tree.rebase([node]);
            expect(tree.intersects(extent, graph)).to.eql([node]);
        });

        it("does not insert if entity has a modified version", function() {
            var graph = iD.Graph(),
                tree = iD.Tree(graph),
                node = iD.Node({id: 'n', loc: [1, 1]}),
                node_ = node.update({loc: [10, 10]}),
                g = graph.replace(node_);

            expect(tree.intersects(iD.geo.Extent([9, 9], [11, 11]), g)).to.eql([node_]);

            graph.rebase([node], [graph]);
            tree.rebase([node]);

            expect(tree.intersects(iD.geo.Extent([0, 0], [2, 2]), g)).to.eql([]);
            expect(tree.intersects(iD.geo.Extent([0, 0], [11, 11]), g)).to.eql([node_]);
        });

        it("does not error on self-referencing relations", function() {
            var graph = iD.Graph(),
                tree = iD.Tree(graph),
                node = iD.Node({id: 'n', loc: [1, 1]}),
                relation = iD.Relation();

            relation = relation.addMember({id: node.id});
            relation = relation.addMember({id: relation.id});

            graph.rebase([node, relation], [graph]);
            tree.rebase([relation]);

            expect(tree.intersects(iD.geo.Extent([0, 0], [2, 2]), graph)).to.eql([relation]);
        });

        it("adjusts entities that are force-rebased", function() {
            var graph = iD.Graph(),
                tree = iD.Tree(graph),
                node = iD.Node({id: 'n', loc: [1, 1]});

            graph.rebase([node], [graph]);
            tree.rebase([node]);

            node = node.move([-1, -1]);
            graph.rebase([node], [graph], true);
            tree.rebase([node], true);

            expect(tree.intersects(iD.geo.Extent([0, 0], [2, 2]), graph)).to.eql([]);
        });
    });

    describe("#intersects", function() {
        it("includes entities within extent, excludes those without", function() {
            var graph = iD.Graph(),
                tree = iD.Tree(graph),
                n1 = iD.Node({loc: [1, 1]}),
                n2 = iD.Node({loc: [3, 3]}),
                extent = iD.geo.Extent([0, 0], [2, 2]);

            graph = graph.replace(n1).replace(n2);
            expect(tree.intersects(extent, graph)).to.eql([n1]);
        });

        it("includes intersecting relations after incomplete members are loaded", function() {
            var graph = iD.Graph(),
                tree = iD.Tree(graph),
                n1 = iD.Node({id: 'n1', loc: [0, 0]}),
                n2 = iD.Node({id: 'n2', loc: [1, 1]}),
                relation = iD.Relation({id: 'r', members: [{id: 'n1'}, {id: 'n2'}]}),
                extent = iD.geo.Extent([0.5, 0.5], [1.5, 1.5]);

            graph.rebase([relation, n1], [graph]);
            tree.rebase([relation, n1]);
            expect(tree.intersects(extent, graph)).to.eql([]);

            graph.rebase([n2], [graph]);
            tree.rebase([n2]);
            expect(tree.intersects(extent, graph)).to.eql([n2, relation]);
        });

        // This happens when local storage includes a changed way but not its nodes.
        it("includes intersecting ways after missing nodes are loaded", function() {
            var base = iD.Graph(),
                tree = iD.Tree(base),
                node = iD.Node({id: 'n', loc: [0.5, 0.5]}),
                way = iD.Way({nodes: ['n']}),
                graph = base.replace(way),
                extent = iD.geo.Extent([0, 0], [1, 1]);

            expect(tree.intersects(extent, graph)).to.eql([]);

            base.rebase([node], [base, graph]);
            tree.rebase([node]);
            expect(tree.intersects(extent, graph)).to.eql([node, way]);
        });

        it("adjusts parent ways when a member node is moved", function() {
            var graph = iD.Graph(),
                tree = iD.Tree(graph),
                node = iD.Node({id: 'n', loc: [1, 1]}),
                way = iD.Way({nodes: ['n']}),
                extent = iD.geo.Extent([0, 0], [2, 2]);

            graph = graph.replace(node).replace(way);
            expect(tree.intersects(extent, graph)).to.eql([node, way]);

            graph = graph.replace(node.move([3, 3]));
            expect(tree.intersects(extent, graph)).to.eql([]);
        });

        it("adjusts parent relations when a member node is moved", function() {
            var graph = iD.Graph(),
                tree = iD.Tree(graph),
                node = iD.Node({id: 'n', loc: [1, 1]}),
                relation = iD.Relation({members: [{type: 'node', id: 'n'}]}),
                extent = iD.geo.Extent([0, 0], [2, 2]);

            graph = graph.replace(node).replace(relation);
            expect(tree.intersects(extent, graph)).to.eql([node, relation]);

            graph = graph.replace(node.move([3, 3]));
            expect(tree.intersects(extent, graph)).to.eql([]);
        });

        it("adjusts parent ways when a member node is removed", function() {
            var graph = iD.Graph(),
                tree = iD.Tree(graph),
                n1 = iD.Node({id: 'n1', loc: [1, 1]}),
                n2 = iD.Node({id: 'n2', loc: [3, 3]}),
                way = iD.Way({nodes: ['n1', 'n2']}),
                extent = iD.geo.Extent([0, 0], [2, 2]);

            graph = graph.replace(n1).replace(n2).replace(way);
            expect(tree.intersects(extent, graph)).to.eql([n1, way]);

            graph = graph.replace(way.removeNode('n1'));
            expect(tree.intersects(extent, graph)).to.eql([n1]);
        });

        it("don't include parent way multiple times when multiple child nodes are moved", function() {
            // checks against the following regression: https://github.com/openstreetmap/iD/issues/1978
            var graph = iD.Graph(),
                tree = iD.Tree(graph),
                n1 = iD.Node({id: 'n1', loc: [1, 1]}),
                n2 = iD.Node({id: 'n2', loc: [3, 3]}),
                way = iD.Way({nodes: ['n1', 'n2']}),
                extent = iD.geo.Extent([0, 0], [4, 4]);

            graph = graph.replace(n1).replace(n2).replace(way);
            expect(tree.intersects(extent, graph)).to.eql([n1, n2, way]);

            graph = graph.replace(n1.move([1.1,1.1])).replace(n2.move([2.1,2.1]));
            expect(
                _.pluck(tree.intersects(extent, graph),'id').sort()
            ).to.eql(
                _.pluck([n1, n2, way],'id').sort()
            );
        });

        it("doesn't include removed entities", function() {
            var graph = iD.Graph(),
                tree = iD.Tree(graph),
                node = iD.Node({loc: [1, 1]}),
                extent = iD.geo.Extent([0, 0], [2, 2]);

            graph = graph.replace(node);
            expect(tree.intersects(extent, graph)).to.eql([node]);

            graph = graph.remove(node);
            expect(tree.intersects(extent, graph)).to.eql([]);
        });

        it("doesn't include removed entities after rebase", function() {
            var base = iD.Graph(),
                tree = iD.Tree(base),
                node = iD.Node({id: 'n', loc: [1, 1]}),
                extent = iD.geo.Extent([0, 0], [2, 2]);

            var graph = base.replace(node).remove(node);
            expect(tree.intersects(extent, graph)).to.eql([]);

            base.rebase([node], [base]);
            tree.rebase([node]);
            expect(tree.intersects(extent, graph)).to.eql([]);
        });

        it("handles recursive relations", function() {
            var base = iD.Graph(),
                tree = iD.Tree(base),
                node = iD.Node({id: 'n', loc: [1, 1]}),
                r1   = iD.Relation({id: 'r1', members: [{id: 'n'}]}),
                r2   = iD.Relation({id: 'r2', members: [{id: 'r1'}]}),
                extent = iD.geo.Extent([0, 0], [2, 2]);

            var graph = base.replace(r1).replace(r2);
            expect(tree.intersects(extent, graph)).to.eql([]);

            base.rebase([node], [base, graph]);
            tree.rebase([node]);
            expect(tree.intersects(extent, graph)).to.eql([node, r1, r2]);
        });
    });
});