# -*- coding: utf-8 -*-
"""
Tests for ReducePyKLPlot
"""
#  This file is part of MAUS: http://micewww.pp.rl.ac.uk:8080/projects/maus
# 
#  MAUS is free software: you can redistribute it and/or modify
#  it under the terms of the GNU General Public License as published by
#  the Free Software Foundation, either version 3 of the License, or
#  (at your option) any later version.
# 
#  MAUS is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#  GNU General Public License for more details.
# 
#  You should have received a copy of the GNU General Public License
#  along with MAUS.  If not, see <http://www.gnu.org/licenses/>.

# pylint: disable=C0103

import json
import unittest

from ReducePyKLPlot import ReducePyKLPlot

class ReducePyKLPlotTestCase(unittest.TestCase): # pylint: disable=R0904, C0301
    """
    Test class for ReducePyKLPlot
    """

    @classmethod
    def setUpClass(self): # pylint: disable=C0202
        """ 
        Prepare for test by setting up worker.
        @param self Object reference.
        """
        self.__reducer = ReducePyKLPlot()
    def setUp(self):
        """ 
        Invoke "birth" and check for success.
        @param self Object reference.
        """
        success = self.__reducer.birth("{}")
        if not success:
            raise Exception('Test setUp failed '+str(success),
                            'reducer.birth() failed')

    def test_birth_default(self):
        """
        Check default configuration after "birth" is called.
        @param self Object reference.
        """
        self.assertEquals(0, self.__reducer.spill_count, 
            "Unexpected reducer.spill_count")
        self.assertEquals("eps", self.__reducer.image_type, 
            "Unexpected reducer.image_type")
        self.assertTrue(not self.__reducer.auto_number, 
            "Unexpected reducer.auto_number")
   
    def test_birth_file_type(self):
        """
        Test configuration when "birth" is called with a supported
        file type. 
        @param self Object reference.
        """
        self.__reducer = ReducePyKLPlot()
        success = self.__reducer.birth("""{"histogram_image_type":"png"}""")
        self.assertTrue(success, "reducer.birth() failed")
        self.assertEquals("png", self.__reducer.image_type, 
                          "Unexpected reducer.image_type")

    def test_invalid_json(self):
        """
        Test "process" with a bad JSON document as an argument string.
        @param self Object reference.
        """
        result_str = self.__reducer.process("{")
        result = json.loads(result_str)
        self.assertTrue("errors" in result, "No errors field")
        errors = result["errors"]
        self.assertTrue("ReducePyKLPlot" in errors,
                        "No ReducePyKLPlot field")        
        errors = errors["ReducePyKLPlot"]
        self.assertTrue(len(errors) >= 1, "Missing error trace")
                
    def test_no_digits(self):
        """
        Test "process" with a JSON document with no "digits" entry.
        @param self Object reference.#
        """
        result = self.__process({})
        self.assertTrue("errors" in result, "No errors field")
        errors = result["errors"]
        self.assertTrue("ReducePyKLPlot" in errors,
                        "kl digits not in spill")        

    def __process(self, json_doc):
        """
        Convert given JSON document to a string and pass to "process".
        @param self Object reference.
        @param json_doc JSON document.
        @returns JSON document string from "process".
        """
        json_str = json.dumps(json_doc)
        result_str = self.__reducer.process(json_str)
        json.loads(result_str)
        return json.loads(result_str)
         
     
    def tearDown(self):
        """
        Invoke "death".
        @param self Object reference.
        """
        #success = self.__reducer.death()
        #if success != None:
            #raise Exception('Test tearDown failed', 'reducer.death() failed')

if __name__ == '__main__':
    unittest.main()