import unittest
import os
import subprocess
from shutil import copyfile
import pandas as pd
from pandas.util.testing import assert_frame_equal
from io import StringIO

# with / without pwr DONE
# with / without url encode DONE
# with / without collapse user DONE
# with output to sdtout DONE
# note that the persistence radius is 7 by default
# reading various file formats including
#        7z, gz, bz2, xml  DONE
# wikia and wikipedia data DONE
# malformed xmls DONE

class Test_Wikiq(unittest.TestCase):
    
    def mkoutputdir(self):
        if not os.path.exists("test_output"):
            os.mkdir("test_output")

    def setuptoutputfiles(self, suffix="xml.7z"):
        self.wikiq_out_name =  self.wiki + ".tsv"
        self.test_output_dir = os.path.join(".", "test_output")
        self.call_output = os.path.join(self.test_output_dir, self.wikiq_out_name)
        self.infile = "{0}.{1}".format(self.wiki,suffix)    
        self.input_dir = "dumps"
        self.input_file = os.path.join(".", self.input_dir,self.infile)
        self.baseline_output_dir = "baseline_output"

    def run_and_check_output(self, call, test_filename):
        test_file = os.path.join(self.test_output_dir, test_filename)
        if os.path.exists(test_file):
            os.remove(test_file)

        proc = subprocess.Popen(call,stdout=subprocess.PIPE,shell=True)
        proc.wait()

        copyfile(self.call_output, test_file)
        baseline_file = os.path.join(".", self.baseline_output_dir, test_filename)

        # as a test let's make sure that we get equal data frames
        test = pd.read_table(test_file)
        baseline = pd.read_table(baseline_file)
        assert_frame_equal(test,baseline)

class Test_Wikipedia(Test_Wikiq):
    def setUp(self):
        print(os.path.abspath("."))
        self.mkoutputdir()
        self.wiki = 'ikwiki-20180301-pages-meta-history'
        self.setuptoutputfiles(suffix="xml.bz2")
        self.base_call = "../bin/wikiq {0} -o {1}"

    def test_WP_url_encode(self):
        test_filename =  "url-encode_" + self.wikiq_out_name
        call = self.base_call.format(self.input_file, self.test_output_dir)
        call = call + " --url-encode"
        self.run_and_check_output(call, test_filename)


class Test_Basic(Test_Wikiq):

    def setUp(self):
        self.mkoutputdir()
        self.wiki="sailormoon"
        self.setuptoutputfiles()
        self.base_call = "../bin/wikiq {0} -o {1}"

    def test_noargs(self):
        test_filename =  "noargs_" + self.wikiq_out_name
        
        call = self.base_call.format(self.input_file, self.test_output_dir)
        print(call)
        self.run_and_check_output(call, test_filename)

    def test_collapse_user(self):
        test_filename =  "collapse-user_" + self.wikiq_out_name
        
        call = self.base_call.format(self.input_file, self.test_output_dir)
        call = call + " --collapse-user"

        self.run_and_check_output(call, test_filename)

    def test_pwr_legacy(self):
        test_filename =  "persistence_legacy_" + self.wikiq_out_name
        
        call = self.base_call.format(self.input_file, self.test_output_dir)
        call = call + " --persistence-legacy"
        self.run_and_check_output(call, test_filename)

    def test_pwr(self):
        test_filename =  "persistence_" + self.wikiq_out_name
        
        call = self.base_call.format(self.input_file, self.test_output_dir)
        call = call + " --persistence"
        self.run_and_check_output(call, test_filename)

    def test_url_encode(self):
        test_filename =  "url-encode_" + self.wikiq_out_name

        call = self.base_call.format(self.input_file, self.test_output_dir)
        call = call + " --url-encode"
        self.run_and_check_output(call, test_filename)

class Test_Malformed(Test_Wikiq):

    def setUp(self):
        self.mkoutputdir()
        self.wiki="twinpeaks"
        self.setuptoutputfiles()
        self.base_call = "../bin/wikiq {0} -o {1}"

    def test_malformed_noargs(self):
        call = self.base_call.format(self.input_file, self.test_output_dir)
        proc = subprocess.Popen(call,stdout=subprocess.PIPE,stderr=subprocess.PIPE, shell=True)
        proc.wait()
        outs, errs = proc.communicate()
        errlines = str(errs).split("\\n")
        self.assertEqual(errlines[-2],'xml.etree.ElementTree.ParseError: no element found: line 1369, column 0')

class Test_Stdout(Test_Wikiq):

    def setUp(self):
        self.mkoutputdir()
        self.wiki = 'sailormoon'
        self.setuptoutputfiles()


    def test_noargs(self):
        self.base_call = ["../bin/wikiq", self.input_file,  "--stdout"]
        proc = subprocess.Popen(self.base_call, stdout=subprocess.PIPE, stderr=subprocess.PIPE, encoding='utf-8')
        outs = proc.stdout
        test_file = "noargs_" + self.wikiq_out_name
        baseline_file = os.path.join(".", self.baseline_output_dir, test_file)
        test = pd.read_table(outs)
        baseline = pd.read_table(baseline_file)
        assert_frame_equal(test,baseline)
        
if __name__ == '__main__':
    unittest.main()