require("../env");

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

var vows = require("vows"),

    assert = require("assert");

var suite = vows.describe("selection.on");

suite.addBatch({

  "select(body)": {

    topic: function() {

      return d3.select("body").html("");

    },

    "registers an event listener for the specified type": function(body) {

      var form = body.append("form"), count = 0;

      form.on("submit", function() { ++count; }); // jsdom has spotty event support

      form.append("input").attr("type", "submit").node().click();

      assert.equal(count, 1);

    },

    "replaces an existing event listener for the same type": function(body) {

      var form = body.append("form"), count = 0, fail = 0;

      form.on("submit", function() { ++fail; });

      form.on("submit", function() { ++count; });

      form.append("input").attr("type", "submit").node().click();

      assert.equal(count, 1);

      assert.equal(fail, 0);

    },

    "removes an existing event listener": function(body) {

      var form = body.append("form"), fail = 0;

      form.on("submit", function() { ++fail; });

      form.on("submit", null);

      form.append("input").attr("type", "submit").node().click();

      assert.equal(fail, 0);

    },

    "ignores removal of non-matching event listener": function(body) {

      body.append("form").on("submit", null);

    },

    "observes the specified namespace": function(body) {

      var form = body.append("form"), foo = 0, bar = 0;

      form.on("submit.foo", function() { ++foo; });

      form.on("submit.bar", function() { ++bar; });

      form.append("input").attr("type", "submit").node().click();

      assert.equal(foo, 1);

      assert.equal(bar, 1);

    },

    /*

    Not really sure how to test this one…

    "observes the specified capture flag": function(body) {

    },

    */

    "passes the current data and index to the event listener": function(body) {

      var forms = body.html("").selectAll("form").data(["a", "b"]).enter().append("form"), dd, ii, data = new Object();

      forms.on("submit", function(d, i) { dd = d; ii = i; });

      forms.append("input").attr("type", "submit")[0][1].click();

      assert.equal(dd, "b");

      assert.equal(ii, 1);

      forms[0][1].__data__ = data;

      forms.append("input").attr("type", "submit")[0][1].click();

      assert.equal(dd, data);

      assert.equal(ii, 1);

    },

    "uses the current element as the context": function(body) {

      var forms = body.html("").selectAll("form").data(["a", "b"]).enter().append("form"), context;

      forms.on("submit", function() { context = this; });

      forms.append("input").attr("type", "submit")[0][1].click();

      assert.domEqual(context, forms[0][1]);

    },

    "sets the current event as d3.event": function(body) {

      var form = body.append("form"), event;

      form.on("submit", function() { event = d3.event; });

      form.append("input").attr("type", "submit").node().click();

      assert.equal(event.type, "submit");

      assert.domEqual(event.target, form[0][0]);

    },

    "restores the original event after notifying listeners": function(body) {

      var form = body.append("form"), event = d3.event = new Object();

      form.on("submit", function() {});

      form.append("input").attr("type", "submit").node().click();

      assert.equal(d3.event, event);

    },

    "returns the current selection": function(body) {

      assert.isTrue(body.on("submit", function() {}) === body);

    },

    "returns the assigned listener if called with one argument": function(body) {

      body.on("mouseover", f).on("click.foo", f);

      function f() {}

      assert.equal(body.on("mouseover"), f);

      assert.equal(body.on("click.foo"), f);

      assert.isUndefined(body.on("click"));

      assert.isUndefined(body.on("mouseover.foo"));

    }

  }

});

suite.export(module);