var vows = require(“vows”),

load = require("../load"),
assert = require("../assert");

var suite = vows.describe(“d3.scale.quantile”);

suite.addBatch({

"quantile": {
  topic: load("scale/quantile").expression("d3.scale.quantile"),
  "has the empty domain by default": function(quantile) {
    assert.isEmpty(quantile().domain());
  },
  "has the empty range by default": function(quantile) {
    assert.isEmpty(quantile().range());
  },
  "uses the R-7 algorithm to compute quantiles": function(quantile) {
    var x = quantile().domain([3, 6, 7, 8, 8, 10, 13, 15, 16, 20]).range([0, 1, 2, 3]);
    assert.deepEqual([3, 6, 6.9, 7, 7.1].map(x), [0, 0, 0, 0, 0]);
    assert.deepEqual([8, 8.9].map(x), [1, 1]);
    assert.deepEqual([9, 9.1, 10, 13].map(x), [2, 2, 2, 2]);
    assert.deepEqual([14.9, 15, 15.1, 16, 20].map(x), [3, 3, 3, 3, 3]);
    var x = quantile().domain([3, 6, 7, 8, 8, 9, 10, 13, 15, 16, 20]).range([0, 1, 2, 3]);
    assert.deepEqual([3, 6, 6.9, 7, 7.1].map(x), [0, 0, 0, 0, 0]);
    assert.deepEqual([8, 8.9].map(x), [1, 1]);
    assert.deepEqual([9, 9.1, 10, 13].map(x), [2, 2, 2, 2]);
    assert.deepEqual([14.9, 15, 15.1, 16, 20].map(x), [3, 3, 3, 3, 3]);
  },
  "domain values are sorted in ascending order": function(quantile) {
    var x = quantile().domain([6, 3, 7, 8, 8, 13, 20, 15, 16, 10]);
    assert.deepEqual(x.domain(), [3, 6, 7, 8, 8, 10, 13, 15, 16, 20]);
  },
  "non-numeric domain values are ignored": function(quantile) {
    var x = quantile().domain([6, 3, NaN, undefined, 7, 8, 8, 13, 20, 15, 16, 10, NaN]);
    assert.deepEqual(x.domain(), [3, 6, 7, 8, 8, 10, 13, 15, 16, 20]);
  },
  "quantiles returns the inner thresholds": function(quantile) {
    var x = quantile().domain([3, 6, 7, 8, 8, 10, 13, 15, 16, 20]).range([0, 1, 2, 3]);
    assert.deepEqual(x.quantiles(), [7.25, 9, 14.5]);
    var x = quantile().domain([3, 6, 7, 8, 8, 9, 10, 13, 15, 16, 20]).range([0, 1, 2, 3]);
    assert.deepEqual(x.quantiles(), [7.5, 9, 14]);
  },
  "range cardinality determines the number of quantiles": function(quantile) {
    var x = quantile().domain([3, 6, 7, 8, 8, 10, 13, 15, 16, 20]);
    assert.deepEqual(x.range([0, 1, 2, 3]).quantiles(), [7.25, 9, 14.5]);
    assert.deepEqual(x.range([0, 1]).quantiles(), [9]);
    assert.deepEqual(x.range([,,,,,]).quantiles(), [6.8, 8, 11.2, 15.2]);
    assert.deepEqual(x.range([,,,,,,]).quantiles(), [6.5, 8, 9, 13, 15.5]);
  },
  "range values are arbitrary": function(quantile) {
    var a = new Object(), b = new Object(), c = new Object();
    var x = quantile().domain([3, 6, 7, 8, 8, 10, 13, 15, 16, 20]).range([a, b, c, a]);
    assert.deepEqual([3, 6, 6.9, 7, 7.1].map(x), [a, a, a, a, a]);
    assert.deepEqual([8, 8.9].map(x), [b, b]);
    assert.deepEqual([9, 9.1, 10, 13].map(x), [c, c, c, c]);
    assert.deepEqual([14.9, 15, 15.1, 16, 20].map(x), [a, a, a, a, a]);
  },
  "returns undefined if the input value is NaN": function(quantile) {
    var x = quantile().domain([3, 6, 7, 8, 8, 10, 13, 15, 16, 20]).range([0, 1, 2, 3]);
    assert.isUndefined(x(NaN));
  },
  "invertExtent": {
    "maps a value in the range to a domain extent": function(quantile) {
      var x = quantile().domain([3, 6, 7, 8, 8, 10, 13, 15, 16, 20]).range([0, 1, 2, 3]);
      assert.deepEqual(x.invertExtent(0), [3, 7.25]);
      assert.deepEqual(x.invertExtent(1), [7.25, 9]);
      assert.deepEqual(x.invertExtent(2), [9, 14.5]);
      assert.deepEqual(x.invertExtent(3), [14.5, 20]);
    },
    "allows arbitrary range values": function(quantile) {
      var a = {}, b = {}, x = quantile().domain([3, 6, 7, 8, 8, 10, 13, 15, 16, 20]).range([a, b]);
      assert.deepEqual(x.invertExtent(a), [3, 9]);
      assert.deepEqual(x.invertExtent(b), [9, 20]);
    },
    "returns [NaN, NaN] when the given value is not in the range": function(quantile) {
      var x = quantile().domain([3, 6, 7, 8, 8, 10, 13, 15, 16, 20]);
      assert.ok(x.invertExtent(-1).every(isNaN));
      assert.ok(x.invertExtent(.5).every(isNaN));
      assert.ok(x.invertExtent(2).every(isNaN));
      assert.ok(x.invertExtent('a').every(isNaN));
    },
    "returns the first match if duplicate values exist in the range": function(quantile) {
      var x = quantile().domain([3, 6, 7, 8, 8, 10, 13, 15, 16, 20]).range([0, 1, 2, 0]);
      assert.deepEqual(x.invertExtent(0), [3, 7.25]);
      assert.deepEqual(x.invertExtent(1), [7.25, 9]);
      assert.deepEqual(x.invertExtent(2), [9, 14.5]);
    }
  }
}

});

suite.export(module);