require("../env");

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

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

var vows = require("vows"),

    assert = require("assert");

var suite = vows.describe("d3.time.hours");

suite.addBatch({

  "hours": {

    topic: function() {

      return d3.time.hours;

    },

    "returns hours": function(range) {

      assert.deepEqual(range(local(2010, 11, 31, 12, 30), local(2010, 11, 31, 15, 30)), [

        local(2010, 11, 31, 13),

        local(2010, 11, 31, 14),

        local(2010, 11, 31, 15)

      ]);

    },

    "has an inclusive lower bound": function(range) {

      assert.deepEqual(range(local(2010, 11, 31, 23), local(2011, 0, 1, 2))[0], local(2010, 11, 31, 23));

    },

    "has an exclusive upper bound": function(range) {

      assert.deepEqual(range(local(2010, 11, 31, 23), local(2011, 0, 1, 2))[2], local(2011, 0, 1, 1));

    },

    "can skip hours": function(range) {

      assert.deepEqual(range(local(2011, 1, 1, 1), local(2011, 1, 1, 13), 3), [

        local(2011, 1, 1, 3),

        local(2011, 1, 1, 6),

        local(2011, 1, 1, 9),

        local(2011, 1, 1, 12)

      ]);

    },

    "observes start of daylight savings time": function(range) {

      assert.deepEqual(range(local(2011, 2, 13, 1), local(2011, 2, 13, 5)), [

        utc(2011, 2, 13, 9),

        utc(2011, 2, 13, 10),

        utc(2011, 2, 13, 11)

      ]);

    },

    "observes end of daylight savings time": function(range) {

      assert.deepEqual(range(local(2011, 10, 6, 0), local(2011, 10, 6, 2)), [

        utc(2011, 10, 6, 7),

        utc(2011, 10, 6, 8),

        utc(2011, 10, 6, 9)

      ]);

    },

    "NPT": {

      "observes 15-minute offset": tz("Asia/Kathmandu", function(range) {

        assert.deepEqual(range(local(2011, 10, 7, 0), local(2011, 10, 7, 3)), [

          utc(2011, 10, 6, 18, 15),

          utc(2011, 10, 6, 19, 15),

          utc(2011, 10, 6, 20, 15)

        ]);

      })

    },

    "IST": {

      "observes 30-minute offset": tz("Asia/Calcutta", function(range) {

        assert.deepEqual(range(local(2011, 10, 7, 0), local(2011, 10, 7, 3)), [

          utc(2011, 10, 6, 18, 30),

          utc(2011, 10, 6, 19, 30),

          utc(2011, 10, 6, 20, 30)

        ]);

      })

    },

    "UTC": {

      topic: function(range) {

        return range.utc;

      },

      "returns hours": function(range) {

        assert.deepEqual(range(utc(2010, 11, 31, 12, 30), utc(2010, 11, 31, 15, 30)), [

          utc(2010, 11, 31, 13),

          utc(2010, 11, 31, 14),

          utc(2010, 11, 31, 15)

        ]);

      },

      "has an inclusive lower bound": function(range) {

        assert.deepEqual(range(utc(2010, 11, 31, 23), utc(2011, 0, 1, 2))[0], utc(2010, 11, 31, 23));

      },

      "has an exclusive upper bound": function(range) {

        assert.deepEqual(range(utc(2010, 11, 31, 23), utc(2011, 0, 1, 2))[2], utc(2011, 0, 1, 1));

      },

      "can skip hours": function(range) {

        assert.deepEqual(range(utc(2011, 1, 1, 1), utc(2011, 1, 1, 13), 3), [

          utc(2011, 1, 1, 3),

          utc(2011, 1, 1, 6),

          utc(2011, 1, 1, 9),

          utc(2011, 1, 1, 12)

        ]);

      },

      "observes start of daylight savings time": function(range) {

        assert.deepEqual(range(utc(2011, 2, 13, 9), utc(2011, 2, 13, 12)), [

          utc(2011, 2, 13, 9),

          utc(2011, 2, 13, 10),

          utc(2011, 2, 13, 11)

        ]);

      },

      "observes end of daylight savings time": function(range) {

        assert.deepEqual(range(utc(2011, 10, 6, 7), utc(2011, 10, 6, 10)), [

          utc(2011, 10, 6, 7),

          utc(2011, 10, 6, 8),

          utc(2011, 10, 6, 9)

        ]);

      }

    }

  }

});

function local(year, month, day, hours, minutes, seconds) {

  return new Date(year, month, day, hours || 0, minutes || 0, seconds || 0);

}

function utc(year, month, day, hours, minutes, seconds) {

  return new Date(Date.UTC(year, month, day, hours || 0, minutes || 0, seconds || 0));

}

function tz(tz, scope) {

  return function() {

    var o = process.env.TZ;

    try {

      process.env.TZ = tz;

      new Date(0).toString(); // invalidate node's dst cache

      new Date().toString();

      scope.apply(this, arguments);

    } finally {

      process.env.TZ = o;

      new Date(0).toString(); // invalidate node's dst cache

      new Date().toString();

    }

  };

}

suite.export(module);