# coding: utf-8
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from __future__ import absolute_import, division, unicode_literals

__authors__ = ["P. Kenter"]
__license__ = "MIT"
__date__ = "06/04/2018"


import datetime as dt
import unittest


from silx.gui.plot._utils.dtime_ticklayout import (
    calcTicks, DtUnit, SECONDS_PER_YEAR)


class TestTickLayout(unittest.TestCase):
    """Test ticks layout algorithms"""

    def testSmallMonthlySpacing(self):
        """ Tests a range that did result in a spacing of less than 1 month.
            It is impossible to add fractional month so the unit must be in days
        """
        from dateutil import parser
        d1 = parser.parse("2017-01-03 13:15:06.000044")
        d2 = parser.parse("2017-03-08 09:16:16.307584")
        _ticks, _units, spacing = calcTicks(d1, d2, nTicks=4)

        self.assertEqual(spacing, DtUnit.DAYS)


    def testNoCrash(self):
        """ Creates many combinations of and number-of-ticks and end-dates;
        tests that it doesn't give an exception and returns a reasonable number
        of ticks.
        """
        d1 = dt.datetime(2017, 1, 3, 13, 15, 6, 44)

        value = 100e-6 # Start at 100 micro sec range.

        while value <= 200 * SECONDS_PER_YEAR:

            d2 = d1 + dt.timedelta(microseconds=value*1e6) # end date range

            for numTicks in range(2, 12):
                ticks, _, _ = calcTicks(d1, d2, numTicks)

                margin = 2.5
                self.assertTrue(
                    numTicks/margin <= len(ticks) <= numTicks*margin,
                    "Condition {} <= {} <= {} failed for # ticks={} and d2={}:"
                     .format(numTicks/margin, len(ticks), numTicks * margin,
                             numTicks, d2))

            value = value * 1.5 # let date period grow exponentially