import unittest
import subprocess
import pysam
import mapdamage
import optparse
import filecmp

def read_nocomment(dnacomp):
    with open(dnacomp, 'r') as f:
        a = f.readlines()
        return [x for x in a if not x.startswith('#')]

def mock_options(filename,rescale_out,folder):
    """Make the options object with nice values for testing"""
    return optparse.Values({
        "filename":filename,
        "rescale_out":rescale_out,
        "verbose":True,
        "folder":folder,
        "rescale_length_5p":12, # default values as in --seq-length
        "rescale_length_3p":12, # default values as in --seq-length
        "quiet":True
        })


class testCases(unittest.TestCase):

    def test_no_stats(self):
        """regular mapDamage"""
        subprocess.run(["mapDamage",  "-i",  "tests/test.bam", "-r", "tests/fake1.fasta", "-d", "tests/results", "--no-stats"], check = True)
        self.assertTrue(read_nocomment("tests/dnacomp.txt") == read_nocomment("tests/results/dnacomp.txt"))

class testRescaling(unittest.TestCase):
    def test_single_end_file(self):
        """Test, rescaling BAM file"""
        #
	    # The expected substition frequencies before and after scaling using the scaled qualities as probalities:
	    # CT	0.06226411977920493		0.04163524443356556
	    # TC	0.020395286584806528		0.020395286584806528
	    # GA	0.04400459948304954		0.03794905109091021
	    # AG	0.05355350777642983		0.05355350777642983
	    # Quality metrics before and after scaling
	    # CT-Q0 	5		5
	    # CT-Q10 	5		2
	    # CT-Q20 	3		2
	    # CT-Q30 	3		2
	    # CT-Q40 	0		0
	    # GA-Q0 	5		5
	    # GA-Q10 	5		4
	    # GA-Q20 	1		0
	    # GA-Q30 	1		0
	    # GA-Q40 	0		0
        options = mock_options("tests/test.bam","tests/test.rescaled.sam","tests/probs/")
        ref = pysam.Fastafile("tests/fake1.fasta")
        mapdamage.rescale.rescale_qual(ref,options,debug=True)
        self.assertTrue(filecmp.cmp("tests/test.rescaled.sam","tests/test.rescaled.correct.sam"))


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