require("../env");

require("../../d3");

var vows = require("vows"),

    assert = require("assert");

var suite = vows.describe("d3.interpolate");

suite.addBatch({

  "interpolate": {

    topic: function() {

      return d3.interpolate;

    },

    "interpolates numbers": function(interpolate) {

      assert.equal(interpolate(2, 12)(.4), 6);

    },

    "interpolates colors": function(interpolate) {

      assert.equal(interpolate("#abcdef", "#fedcba")(.4), "#ccd3da");

    },

    "interpolates strings": function(interpolate) {

      assert.equal(interpolate("width:10px;", "width:50px;")(.2), "width:18px;");

    },

    "interpolates arrays": function(interpolate) {

      assert.deepEqual(interpolate([2, 4], [12, 24])(.4), [6, 12]);

    },

    "interpolates objects": function(interpolate) {

      assert.deepEqual(interpolate({foo: 2}, {foo: 12})(.4), {foo: 6});

    }

  }

});

suite.addBatch({

  "interpolateNumber": {

    topic: function() {

      return d3.interpolateNumber;

    },

    "interpolates numbers": function(interpolate) {

      assert.equal(interpolate(2, 12)(.4), 6);

      assert.equal(interpolate(2, 12)(.6), 8);

    }

  }

});

suite.addBatch({

  "interpolateRound": {

    topic: function() {

      return d3.interpolateRound;

    },

    "interpolates integers": function(interpolate) {

      assert.equal(interpolate(2, 12)(.456), 7);

      assert.equal(interpolate(2, 12)(.678), 9);

    }

  }

});

suite.addBatch({

  "interpolateString": {

    topic: function() {

      return d3.interpolateString;

    },

    "interpolates matching numbers in both strings": function(interpolate) {

      assert.equal(interpolate(" 10/20 30", "50/10 100 ")(.2), "18/18 44 ");

      assert.equal(interpolate(" 10/20 30", "50/10 100 ")(.4), "26/16 58 ");

    },

    "preserves non-numbers in string b": function(interpolate) {

      assert.equal(interpolate(" 10/20 30", "50/10 foo ")(.2), "18/18 foo ");

      assert.equal(interpolate(" 10/20 30", "50/10 foo ")(.4), "26/16 foo ");

    },

    "preserves non-matching numbers in string b": function(interpolate) {

      assert.equal(interpolate(" 10/20 foo", "50/10 100 ")(.2), "18/18 100 ");

      assert.equal(interpolate(" 10/20 bar", "50/10 100 ")(.4), "26/16 100 ");

    },

    "preserves equal-value numbers in both strings": function(interpolate) {

      assert.equal(interpolate(" 10/20 100 20", "50/10 100, 20 ")(.2), "18/18 100, 20 ");

      assert.equal(interpolate(" 10/20 100 20", "50/10 100, 20 ")(.4), "26/16 100, 20 ");

    },

    "interpolates exponent notation correctly": function(interpolate) {

      assert.equal(interpolate("1e+3", "1e+4")(.5), "5500");

      assert.equal(interpolate("1e-3", "1e-4")(.5), "0.00055");

    }

  }

});

suite.addBatch({

  "interpolateRgb": {

    topic: function() {

      return d3.interpolateRgb;

    },

    "parses string input": function(interpolate) {

      assert.equal(interpolate("steelblue", "#f00")(.2), "#6b6890");

      assert.equal(interpolate("steelblue", "#f00")(.6), "#b53448");

    },

    "parses d3.rgb input": function(interpolate) {

      assert.equal(interpolate(d3.rgb("steelblue"), "#f00")(.2), "#6b6890");

      assert.equal(interpolate("steelblue", d3.rgb(255, 0, 0))(.6), "#b53448");

    },

    "parses d3.hsl input": function(interpolate) {

      assert.equal(interpolate(d3.hsl("steelblue"), "#f00")(.2), "#6b6890");

      assert.equal(interpolate("steelblue", d3.hsl(0, 1, .5))(.6), "#b53448");

    },

    "interpolates in RGB color space": function(interpolate) {

      assert.equal(interpolate("steelblue", "#f00")(.2), "#6b6890");

    },

    "outputs an RGB string": function(interpolate) {

      assert.equal(interpolate("steelblue", "#f00")(.2), "#6b6890");

    }

  }

});

suite.addBatch({

  "interpolateHsl": {

    topic: function() {

      return d3.interpolateHsl;

    },

    "parses string input": function(interpolate) {

      assert.equal(interpolate("steelblue", "#f00")(.2), "#38c3a2");

      assert.equal(interpolate("steelblue", "#f00")(.6), "#96e11c");

    },

    "parses d3.hsl input": function(interpolate) {

      assert.equal(interpolate(d3.hsl("steelblue"), "#f00")(.2), "#38c3a2");

      assert.equal(interpolate("steelblue", d3.hsl(0, 1, .5))(.6), "#96e11c");

    },

    "parses d3.rgb input": function(interpolate) {

      assert.equal(interpolate(d3.rgb("steelblue"), "#f00")(.2), "#38c3a2");

      assert.equal(interpolate("steelblue", d3.rgb(255, 0, 0))(.6), "#96e11c");

    },

    "interpolates in HSL color space": function(interpolate) {

      assert.equal(interpolate("steelblue", "#f00")(.2), "#38c3a2");

    },

    "outputs a hexadecimal string": function(interpolate) {

      assert.equal(interpolate("steelblue", "#f00")(.2), "#38c3a2");

    }

  }

});

suite.addBatch({

  "interpolateArray": {

    topic: function() {

      return d3.interpolateArray;

    },

    "interpolates defined elements": function(interpolate) {

      assert.deepEqual(interpolate([2, 12], [4, 24])(.5), [3, 18]);

    },

    "interpolates nested objects and arrays": function(interpolate) {

      assert.deepEqual(interpolate([[2, 12]], [[4, 24]])(.5), [[3, 18]]);

      assert.deepEqual(interpolate([{foo: [2, 12]}], [{foo: [4, 24]}])(.5), [{foo: [3, 18]}]);

    },

    "merges non-shared elements": function(interpolate) {

      assert.deepEqual(interpolate([2, 12], [4, 24, 12])(.5), [3, 18, 12]);

      assert.deepEqual(interpolate([2, 12, 12], [4, 24])(.5), [3, 18, 12]);

    }

  }

});

suite.addBatch({

  "interpolateObject": {

    topic: function() {

      return d3.interpolateObject;

    },

    "interpolates defined properties": function(interpolate) {

      assert.deepEqual(interpolate({a: 2, b: 12}, {a: 4, b: 24})(.5), {a: 3, b: 18});

    },

    "interpolates inherited properties": function(interpolate) {

      function a(a) { this.a = a; }

      a.prototype.b = 12;

      assert.deepEqual(interpolate(new a(2), new a(4))(.5), {a: 3, b: 12});

    },

    "interpolates color properties as rgb": function(interpolate) {

      assert.deepEqual(interpolate({background: "red"}, {background: "green"})(.5), {background: "#804000"});

      assert.deepEqual(interpolate({fill: "red"}, {fill: "green"})(.5), {fill: "#804000"});

      assert.deepEqual(interpolate({stroke: "red"}, {stroke: "green"})(.5), {stroke: "#804000"});

      assert.deepEqual(interpolate({color: "red"}, {color: "green"})(.5), {color: "#804000"});

    },

    "interpolates nested objects and arrays": function(interpolate) {

      assert.deepEqual(interpolate({foo: [2, 12]}, {foo: [4, 24]})(.5), {foo: [3, 18]});

      assert.deepEqual(interpolate({foo: {bar: [2, 12]}}, {foo: {bar: [4, 24]}})(.5), {foo: {bar: [3, 18]}});

    },

    "merges non-shared properties": function(interpolate) {

      assert.deepEqual(interpolate({foo: 2}, {foo: 4, bar: 12})(.5), {foo: 3, bar: 12});

      assert.deepEqual(interpolate({foo: 2, bar: 12}, {foo: 4})(.5), {foo: 3, bar: 12});

    }

  }

});

suite.addBatch({

  "interpolators": {

    topic: function() {

      return d3.interpolate;

    },

    "can register a custom interpolator": function(interpolate) {

      try {

        d3.interpolators.push(function(a, b) {

          return a == "one" && b == "two" && d3.interpolateNumber(1, 2);

        });

        assert.equal(interpolate("one", "two")(-.5), .5);

        assert.equal(interpolate("one", "two")(0), 1);

        assert.equal(interpolate("one", "two")(.5), 1.5);

        assert.equal(interpolate("one", "two")(1), 2);

        assert.equal(interpolate("one", "two")(1.5), 2.5);

      } finally {

        d3.interpolators.pop();

      }

    }

  }

});

suite.export(module);