# Copyright 2001 by Gavin E. Crooks.  All rights reserved.
# Modifications Copyright 2010 Jeffrey Finkelstein. All rights reserved.
#
# This code is part of the Biopython distribution and governed by its
# license.  Please see the LICENSE file that should have been included
# as part of this package.

"""Unit test for Scop."""

import unittest
from io import StringIO

from Bio.SCOP import cmp_sccs
from Bio.SCOP import parse_domain
from Bio.SCOP import Scop


class ScopTests(unittest.TestCase):
    def _compare_cla_lines(self, cla_line_1, cla_line_2):
        """Compare the two specified Cla lines for equality.

        The order of the key-value pairs in the sixth field of the lines does
        not matter. For more information, see
        http://scop.mrc-lmb.cam.ac.uk/scop/release-notes.html.
        """
        fields1 = cla_line_1.rstrip().split("\t")
        fields2 = cla_line_2.rstrip().split("\t")
        # compare the first five fields in a Cla line, which should be exactly
        # the same
        self.assertEqual(fields1[:5], fields2[:5])
        # compare the hierarchy key-value pairs, which are unordered
        self.assertCountEqual(fields1[5].split(","), fields2[5].split(","))

    def testParse(self):
        with open("./SCOP/dir.cla.scop.txt_test") as f:
            cla = f.read()
        with open("./SCOP/dir.des.scop.txt_test") as f:
            des = f.read()
        with open("./SCOP/dir.hie.scop.txt_test") as f:
            hie = f.read()

        scop = Scop(StringIO(cla), StringIO(des), StringIO(hie))

        cla_out = StringIO()
        scop.write_cla(cla_out)
        lines = zip(cla.rstrip().split("\n"), cla_out.getvalue().rstrip().split("\n"))
        for expected_line, line in lines:
            self._compare_cla_lines(expected_line, line)

        des_out = StringIO()
        scop.write_des(des_out)
        self.assertEqual(des_out.getvalue(), des)

        hie_out = StringIO()
        scop.write_hie(hie_out)
        self.assertEqual(hie_out.getvalue(), hie)

        domain = scop.getDomainBySid("d1hbia_")
        self.assertEqual(domain.sunid, 14996)

        domains = scop.getDomains()
        self.assertEqual(len(domains), 14)
        self.assertEqual(domains[4].sunid, 14988)

        dom = scop.getNodeBySunid(-111)
        self.assertIsNone(dom)
        dom = scop.getDomainBySid("no such domain")
        self.assertIsNone(dom)

    def testSccsOrder(self):
        self.assertEqual(cmp_sccs("a.1.1.1", "a.1.1.1"), 0)
        self.assertEqual(cmp_sccs("a.1.1.2", "a.1.1.1"), 1)
        self.assertEqual(cmp_sccs("a.1.1.2", "a.1.1.11"), -1)
        self.assertEqual(cmp_sccs("a.1.2.2", "a.1.1.11"), 1)
        self.assertEqual(cmp_sccs("a.1.2.2", "a.5.1.11"), -1)
        self.assertEqual(cmp_sccs("b.1.2.2", "a.5.1.11"), 1)
        self.assertEqual(cmp_sccs("b.1.2.2", "b.1.2"), 1)

    def testParseDomain(self):
        s = ">d1tpt_1 a.46.2.1 (1-70) Thymidine phosphorylase {Escherichia coli}"
        dom = parse_domain(s)

        self.assertEqual(dom.sid, "d1tpt_1")
        self.assertEqual(dom.sccs, "a.46.2.1")
        self.assertEqual(dom.residues.pdbid, "1tpt")
        self.assertEqual(dom.description, "Thymidine phosphorylase {Escherichia coli}")

        s2 = "d1tpt_1 a.46.2.1 (1tpt 1-70) Thymidine phosphorylase {E. coli}"
        self.assertEqual(s2, str(parse_domain(s2)))

        # Genetic domains (See Astral release notes)
        s3 = "g1cph.1 g.1.1.1 (1cph B:,A:) Insulin {Cow (Bos taurus)}"
        self.assertEqual(s3, str(parse_domain(s3)))

        s4 = "e1cph.1a g.1.1.1 (1cph A:) Insulin {Cow (Bos taurus)}"
        self.assertEqual(s4, str(parse_domain(s4)))

        # Raw Astral header
        s5 = ">e1cph.1a g.1.1.1 (A:) Insulin {Cow (Bos taurus)}"
        self.assertEqual(s4, str(parse_domain(s5)))

        self.assertRaises(ValueError, parse_domain, "Totally wrong")

    def testConstructFromDirectory(self):
        scop = Scop(dir_path="SCOP", version="test")
        self.assertIsInstance(scop, Scop)

        domain = scop.getDomainBySid("d1hbia_")
        self.assertEqual(domain.sunid, 14996)

    def testGetAscendent(self):
        scop = Scop(dir_path="SCOP", version="test")
        domain = scop.getDomainBySid("d1hbia_")

        # get the fold
        fold = domain.getAscendent("cf")
        self.assertEqual(fold.sunid, 46457)

        # get the superfamily
        sf = domain.getAscendent("superfamily")
        self.assertEqual(sf.sunid, 46458)

        # px has no px ascendent
        px = domain.getAscendent("px")
        self.assertIsNone(px)

        # an sf has no px ascendent
        px2 = sf.getAscendent("px")
        self.assertIsNone(px2)

    def test_get_descendents(self):
        """Test getDescendents method."""
        scop = Scop(dir_path="SCOP", version="test")
        fold = scop.getNodeBySunid(46457)

        # get px descendents
        domains = fold.getDescendents("px")
        self.assertEqual(len(domains), 14)
        for d in domains:
            self.assertEqual(d.type, "px")

        sfs = fold.getDescendents("superfamily")
        self.assertEqual(len(sfs), 1)
        for d in sfs:
            self.assertEqual(d.type, "sf")

        # cl has no cl descendent
        cl = fold.getDescendents("cl")
        self.assertEqual(cl, [])


if __name__ == "__main__":
    runner = unittest.TextTestRunner(verbosity=2)
    unittest.main(testRunner=runner)