# This module is part of GitPython and is released under the
# 3-Clause BSD License: https://opensource.org/license/bsd-3-clause/

import os.path as osp
import tempfile

from git.objects import IndexObject
from git.refs import RefLog, RefLogEntry
from git.util import Actor, hex_to_bin, rmtree

from test.lib import TestBase, fixture_path


class TestRefLog(TestBase):
    def test_reflogentry(self):
        nullhexsha = IndexObject.NULL_HEX_SHA
        hexsha = "F" * 40
        actor = Actor("name", "email")
        msg = "message"

        self.assertRaises(ValueError, RefLogEntry.new, nullhexsha, hexsha, "noactor", 0, 0, "")
        e = RefLogEntry.new(nullhexsha, hexsha, actor, 0, 1, msg)

        assert e.oldhexsha == nullhexsha
        assert e.newhexsha == hexsha
        assert e.actor == actor
        assert e.time[0] == 0
        assert e.time[1] == 1
        assert e.message == msg

        # Check representation (roughly).
        assert repr(e).startswith(nullhexsha)

    def test_base(self):
        rlp_head = fixture_path("reflog_HEAD")
        rlp_master = fixture_path("reflog_master")
        tdir = tempfile.mkdtemp(suffix="test_reflogs")

        rlp_master_ro = RefLog.path(self.rorepo.head)
        assert osp.isfile(rlp_master_ro)

        # Simple read.
        reflog = RefLog.from_file(rlp_master_ro)
        assert reflog._path is not None
        assert isinstance(reflog, RefLog)
        assert len(reflog)

        # iter_entries works with path and with stream.
        assert len(list(RefLog.iter_entries(open(rlp_master, "rb"))))
        assert len(list(RefLog.iter_entries(rlp_master)))

        # Raise on invalid revlog.
        # TODO: Try multiple corrupted ones!
        pp = "reflog_invalid_"
        for suffix in ("oldsha", "newsha", "email", "date", "sep"):
            self.assertRaises(ValueError, RefLog.from_file, fixture_path(pp + suffix))
        # END for each invalid file

        # Cannot write an uninitialized reflog.
        self.assertRaises(ValueError, RefLog().write)

        # Test serialize and deserialize - results must match exactly.
        binsha = hex_to_bin(("f" * 40).encode("ascii"))
        msg = "my reflog message"
        cr = self.rorepo.config_reader()
        for rlp in (rlp_head, rlp_master):
            reflog = RefLog.from_file(rlp)
            tfile = osp.join(tdir, osp.basename(rlp))
            reflog.to_file(tfile)
            assert reflog.write() is reflog

            # Parsed result must match...
            treflog = RefLog.from_file(tfile)
            assert treflog == reflog

            # ...as well as each bytes of the written stream.
            assert open(tfile).read() == open(rlp).read()

            # Append an entry.
            entry = RefLog.append_entry(cr, tfile, IndexObject.NULL_BIN_SHA, binsha, msg)
            assert entry.oldhexsha == IndexObject.NULL_HEX_SHA
            assert entry.newhexsha == "f" * 40
            assert entry.message == msg
            assert RefLog.from_file(tfile)[-1] == entry

            # Index entry.
            # Raises on invalid index.
            self.assertRaises(IndexError, RefLog.entry_at, rlp, 10000)

            # Indices can be positive...
            assert isinstance(RefLog.entry_at(rlp, 0), RefLogEntry)
            RefLog.entry_at(rlp, 23)

            # ...and negative.
            for idx in (-1, -24):
                RefLog.entry_at(rlp, idx)
            # END for each index to read
        # END for each reflog

        # Finally remove our temporary data.
        rmtree(tdir)