from __future__ import absolute_import, print_function

import difflib

import random

import unittest

from mercurial import linelog

vecratio = 3 # number of replacelines / number of replacelines_vec

maxlinenum = 0xffffff

maxb1 = 0xffffff

maxdeltaa = 10

maxdeltab = 10

def _genedits(seed, endrev):

    lines = []

    random.seed(seed)

    rev = 0

    for rev in range(0, endrev):

        n = len(lines)

        a1 = random.randint(0, n)

        a2 = random.randint(a1, min(n, a1 + maxdeltaa))

        b1 = random.randint(0, maxb1)

        b2 = random.randint(b1, b1 + maxdeltab)

        usevec = not bool(random.randint(0, vecratio))

        if usevec:

            blines = [(random.randint(0, rev), random.randint(0, maxlinenum))

                      for _ in range(b1, b2)]

        else:

            blines = [(rev, bidx) for bidx in range(b1, b2)]

        lines[a1:a2] = blines

        yield lines, rev, a1, a2, b1, b2, blines, usevec

class linelogtests(unittest.TestCase):

    def testlinelogencodedecode(self):

        program = [linelog._eof(0, 0),

                   linelog._jge(41, 42),

                   linelog._jump(0, 43),

                   linelog._eof(0, 0),

                   linelog._jl(44, 45),

                   linelog._line(46, 47),

                   ]

        ll = linelog.linelog(program, maxrev=100)

        enc = ll.encode()

        # round-trips okay

        self.assertEqual(linelog.linelog.fromdata(enc)._program, ll._program)

        self.assertEqual(linelog.linelog.fromdata(enc), ll)

        # This encoding matches the encoding used by hg-experimental's

        # linelog file, or is supposed to if it doesn't.

        self.assertEqual(enc, (b'\x00\x00\x01\x90\x00\x00\x00\x06'

                               b'\x00\x00\x00\xa4\x00\x00\x00*'

                               b'\x00\x00\x00\x00\x00\x00\x00+'

                               b'\x00\x00\x00\x00\x00\x00\x00\x00'

                               b'\x00\x00\x00\xb1\x00\x00\x00-'

                               b'\x00\x00\x00\xba\x00\x00\x00/'))

    def testsimpleedits(self):

        ll = linelog.linelog()

        # Initial revision: add lines 0, 1, and 2

        ll.replacelines(1, 0, 0, 0, 3)

        self.assertEqual([(l.rev, l.linenum) for l in ll.annotate(1)],

                         [(1, 0),

                          (1, 1),

                          (1, 2),

                         ])

        # Replace line 1 with a new line

        ll.replacelines(2, 1, 2, 1, 2)

        self.assertEqual([(l.rev, l.linenum) for l in ll.annotate(2)],

                         [(1, 0),

                          (2, 1),

                          (1, 2),

                         ])

        # delete a line out of 2

        ll.replacelines(3, 1, 2, 0, 0)

        self.assertEqual([(l.rev, l.linenum) for l in ll.annotate(3)],

                         [(1, 0),

                          (1, 2),

                         ])

        # annotation of 1 is unchanged

        self.assertEqual([(l.rev, l.linenum) for l in ll.annotate(1)],

                         [(1, 0),

                          (1, 1),

                          (1, 2),

                         ])

        ll.annotate(3) # set internal state to revision 3

        start = ll.getoffset(0)

        end = ll.getoffset(1)

        self.assertEqual(ll.getalllines(start, end), [

            (1, 0),

            (2, 1),

            (1, 1),

        ])

        self.assertEqual(ll.getalllines(), [

            (1, 0),

            (2, 1),

            (1, 1),

            (1, 2),

        ])

    def testparseclinelogfile(self):

        # This data is what the replacements in testsimpleedits

        # produce when fed to the original linelog.c implementation.

        data = (b'\x00\x00\x00\x0c\x00\x00\x00\x0f'

                b'\x00\x00\x00\x00\x00\x00\x00\x02'

                b'\x00\x00\x00\x05\x00\x00\x00\x06'

                b'\x00\x00\x00\x06\x00\x00\x00\x00'

                b'\x00\x00\x00\x00\x00\x00\x00\x07'

                b'\x00\x00\x00\x06\x00\x00\x00\x02'

                b'\x00\x00\x00\x00\x00\x00\x00\x00'

                b'\x00\x00\x00\t\x00\x00\x00\t'

                b'\x00\x00\x00\x00\x00\x00\x00\x0c'

                b'\x00\x00\x00\x08\x00\x00\x00\x05'

                b'\x00\x00\x00\x06\x00\x00\x00\x01'

                b'\x00\x00\x00\x00\x00\x00\x00\x05'

                b'\x00\x00\x00\x0c\x00\x00\x00\x05'

                b'\x00\x00\x00\n\x00\x00\x00\x01'

                b'\x00\x00\x00\x00\x00\x00\x00\t')

        llc = linelog.linelog.fromdata(data)

        self.assertEqual([(l.rev, l.linenum) for l in llc.annotate(1)],

                         [(1, 0),

                          (1, 1),

                          (1, 2),

                         ])

        self.assertEqual([(l.rev, l.linenum) for l in llc.annotate(2)],

                         [(1, 0),

                          (2, 1),

                          (1, 2),

                         ])

        self.assertEqual([(l.rev, l.linenum) for l in llc.annotate(3)],

                         [(1, 0),

                          (1, 2),

                         ])

        # Check we emit the same bytecode.

        ll = linelog.linelog()

        # Initial revision: add lines 0, 1, and 2

        ll.replacelines(1, 0, 0, 0, 3)

        # Replace line 1 with a new line

        ll.replacelines(2, 1, 2, 1, 2)

        # delete a line out of 2

        ll.replacelines(3, 1, 2, 0, 0)

        diff = '\n   ' + '\n   '.join(difflib.unified_diff(

            ll.debugstr().splitlines(), llc.debugstr().splitlines(),

            'python', 'c', lineterm=''))

        self.assertEqual(ll._program, llc._program, 'Program mismatch: ' + diff)

        # Done as a secondary step so we get a better result if the

        # program is where the mismatch is.

        self.assertEqual(ll, llc)

        self.assertEqual(ll.encode(), data)

    def testanothersimplecase(self):

        ll = linelog.linelog()

        ll.replacelines(3, 0, 0, 0, 2)

        ll.replacelines(4, 0, 2, 0, 0)

        self.assertEqual([(l.rev, l.linenum) for l in ll.annotate(4)],

                         [])

        self.assertEqual([(l.rev, l.linenum) for l in ll.annotate(3)],

                         [(3, 0), (3, 1)])

        # rev 2 is empty because contents were only ever introduced in rev 3

        self.assertEqual([(l.rev, l.linenum) for l in ll.annotate(2)],

                         [])

    def testrandomedits(self):

        # Inspired by original linelog tests.

        seed = random.random()

        numrevs = 2000

        ll = linelog.linelog()

        # Populate linelog

        for lines, rev, a1, a2, b1, b2, blines, usevec in _genedits(

                seed, numrevs):

            if usevec:

                ll.replacelines_vec(rev, a1, a2, blines)

            else:

                ll.replacelines(rev, a1, a2, b1, b2)

            ar = ll.annotate(rev)

            self.assertEqual(ll.annotateresult, lines)

        # Verify we can get back these states by annotating each rev

        for lines, rev, a1, a2, b1, b2, blines, usevec in _genedits(

                seed, numrevs):

            ar = ll.annotate(rev)

            self.assertEqual([(l.rev, l.linenum) for l in ar], lines)

    def testinfinitebadprogram(self):

        ll = linelog.linelog.fromdata(

            b'\x00\x00\x00\x00\x00\x00\x00\x02'  # header

            b'\x00\x00\x00\x00\x00\x00\x00\x01'  # JUMP to self

        )

        with self.assertRaises(linelog.LineLogError):

            # should not be an infinite loop and raise

            ll.annotate(1)

if __name__ == '__main__':

    import silenttestrunner

    silenttestrunner.main(__name__)