"""
module defining a subversion path object based on the external
command 'svn'. This modules aims to work with svn 1.3 and higher
but might also interact well with earlier versions.
"""

import os, sys, time, re
import py
from py import path, process
from py._path import common
from py._path import svnwc as svncommon
from py._path.cacheutil import BuildcostAccessCache, AgingCache

DEBUG=False

class SvnCommandPath(svncommon.SvnPathBase):
    """ path implementation that offers access to (possibly remote) subversion
    repositories. """

    _lsrevcache = BuildcostAccessCache(maxentries=128)
    _lsnorevcache = AgingCache(maxentries=1000, maxseconds=60.0)

    def __new__(cls, path, rev=None, auth=None):
        self = object.__new__(cls)
        if isinstance(path, cls):
            rev = path.rev
            auth = path.auth
            path = path.strpath
        svncommon.checkbadchars(path)
        path = path.rstrip('/')
        self.strpath = path
        self.rev = rev
        self.auth = auth
        return self

    def __repr__(self):
        if self.rev == -1:
            return 'svnurl(%r)' % self.strpath
        else:
            return 'svnurl(%r, %r)' % (self.strpath, self.rev)

    def _svnwithrev(self, cmd, *args):
        """ execute an svn command, append our own url and revision """
        if self.rev is None:
            return self._svnwrite(cmd, *args)
        else:
            args = ['-r', self.rev] + list(args)
            return self._svnwrite(cmd, *args)

    def _svnwrite(self, cmd, *args):
        """ execute an svn command, append our own url """
        l = ['svn %s' % cmd]
        args = ['"%s"' % self._escape(item) for item in args]
        l.extend(args)
        l.append('"%s"' % self._encodedurl())
        # fixing the locale because we can't otherwise parse
        string = " ".join(l)
        if DEBUG:
            print("execing %s" % string)
        out = self._svncmdexecauth(string)
        return out

    def _svncmdexecauth(self, cmd):
        """ execute an svn command 'as is' """
        cmd = svncommon.fixlocale() + cmd
        if self.auth is not None:
            cmd += ' ' + self.auth.makecmdoptions()
        return self._cmdexec(cmd)

    def _cmdexec(self, cmd):
        try:
            out = process.cmdexec(cmd)
        except py.process.cmdexec.Error:
            e = sys.exc_info()[1]
            if (e.err.find('File Exists') != -1 or
                            e.err.find('File already exists') != -1):
                raise py.error.EEXIST(self)
            raise
        return out

    def _svnpopenauth(self, cmd):
        """ execute an svn command, return a pipe for reading stdin """
        cmd = svncommon.fixlocale() + cmd
        if self.auth is not None:
            cmd += ' ' + self.auth.makecmdoptions()
        return self._popen(cmd)

    def _popen(self, cmd):
        return os.popen(cmd)

    def _encodedurl(self):
        return self._escape(self.strpath)

    def _norev_delentry(self, path):
        auth = self.auth and self.auth.makecmdoptions() or None
        self._lsnorevcache.delentry((str(path), auth))

    def open(self, mode='r'):
        """ return an opened file with the given mode. """
        if mode not in ("r", "rU",):
            raise ValueError("mode %r not supported" % (mode,))
        assert self.check(file=1) # svn cat returns an empty file otherwise
        if self.rev is None:
            return self._svnpopenauth('svn cat "%s"' % (
                                      self._escape(self.strpath), ))
        else:
            return self._svnpopenauth('svn cat -r %s "%s"' % (
                                      self.rev, self._escape(self.strpath)))

    def dirpath(self, *args, **kwargs):
        """ return the directory path of the current path joined
            with any given path arguments.
        """
        l = self.strpath.split(self.sep)
        if len(l) < 4:
            raise py.error.EINVAL(self, "base is not valid")
        elif len(l) == 4:
            return self.join(*args, **kwargs)
        else:
            return self.new(basename='').join(*args, **kwargs)

    # modifying methods (cache must be invalidated)
    def mkdir(self, *args, **kwargs):
        """ create & return the directory joined with args.
        pass a 'msg' keyword argument to set the commit message.
        """
        commit_msg = kwargs.get('msg', "mkdir by py lib invocation")
        createpath = self.join(*args)
        createpath._svnwrite('mkdir', '-m', commit_msg)
        self._norev_delentry(createpath.dirpath())
        return createpath

    def copy(self, target, msg='copied by py lib invocation'):
        """ copy path to target with checkin message msg."""
        if getattr(target, 'rev', None) is not None:
            raise py.error.EINVAL(target, "revisions are immutable")
        self._svncmdexecauth('svn copy -m "%s" "%s" "%s"' %(msg,
                             self._escape(self), self._escape(target)))
        self._norev_delentry(target.dirpath())

    def rename(self, target, msg="renamed by py lib invocation"):
        """ rename this path to target with checkin message msg. """
        if getattr(self, 'rev', None) is not None:
            raise py.error.EINVAL(self, "revisions are immutable")
        self._svncmdexecauth('svn move -m "%s" --force "%s" "%s"' %(
                             msg, self._escape(self), self._escape(target)))
        self._norev_delentry(self.dirpath())
        self._norev_delentry(self)

    def remove(self, rec=1, msg='removed by py lib invocation'):
        """ remove a file or directory (or a directory tree if rec=1) with
checkin message msg."""
        if self.rev is not None:
            raise py.error.EINVAL(self, "revisions are immutable")
        self._svncmdexecauth('svn rm -m "%s" "%s"' %(msg, self._escape(self)))
        self._norev_delentry(self.dirpath())

    def export(self, topath):
        """ export to a local path

            topath should not exist prior to calling this, returns a
            py.path.local instance
        """
        topath = py.path.local(topath)
        args = ['"%s"' % (self._escape(self),),
                '"%s"' % (self._escape(topath),)]
        if self.rev is not None:
            args = ['-r', str(self.rev)] + args
        self._svncmdexecauth('svn export %s' % (' '.join(args),))
        return topath

    def ensure(self, *args, **kwargs):
        """ ensure that an args-joined path exists (by default as
            a file). If you specify a keyword argument 'dir=True'
            then the path is forced to be a directory path.
        """
        if getattr(self, 'rev', None) is not None:
            raise py.error.EINVAL(self, "revisions are immutable")
        target = self.join(*args)
        dir = kwargs.get('dir', 0)
        for x in target.parts(reverse=True):
            if x.check():
                break
        else:
            raise py.error.ENOENT(target, "has not any valid base!")
        if x == target:
            if not x.check(dir=dir):
                raise dir and py.error.ENOTDIR(x) or py.error.EISDIR(x)
            return x
        tocreate = target.relto(x)
        basename = tocreate.split(self.sep, 1)[0]
        tempdir = py.path.local.mkdtemp()
        try:
            tempdir.ensure(tocreate, dir=dir)
            cmd = 'svn import -m "%s" "%s" "%s"' % (
                    "ensure %s" % self._escape(tocreate),
                    self._escape(tempdir.join(basename)),
                    x.join(basename)._encodedurl())
            self._svncmdexecauth(cmd)
            self._norev_delentry(x)
        finally:
            tempdir.remove()
        return target

    # end of modifying methods
    def _propget(self, name):
        res = self._svnwithrev('propget', name)
        return res[:-1] # strip trailing newline

    def _proplist(self):
        res = self._svnwithrev('proplist')
        lines = res.split('\n')
        lines = [x.strip() for x in lines[1:]]
        return svncommon.PropListDict(self, lines)

    def info(self):
        """ return an Info structure with svn-provided information. """
        parent = self.dirpath()
        nameinfo_seq = parent._listdir_nameinfo()
        bn = self.basename
        for name, info in nameinfo_seq:
            if name == bn:
                return info
        raise py.error.ENOENT(self)


    def _listdir_nameinfo(self):
        """ return sequence of name-info directory entries of self """
        def builder():
            try:
                res = self._svnwithrev('ls', '-v')
            except process.cmdexec.Error:
                e = sys.exc_info()[1]
                if e.err.find('non-existent in that revision') != -1:
                    raise py.error.ENOENT(self, e.err)
                elif e.err.find('File not found') != -1:
                    raise py.error.ENOENT(self, e.err)
                elif e.err.find('not part of a repository')!=-1:
                    raise py.error.ENOENT(self, e.err)
                elif e.err.find('Unable to open')!=-1:
                    raise py.error.ENOENT(self, e.err)
                elif e.err.lower().find('method not allowed')!=-1:
                    raise py.error.EACCES(self, e.err)
                raise py.error.Error(e.err)
            lines = res.split('\n')
            nameinfo_seq = []
            for lsline in lines:
                if lsline:
                    info = InfoSvnCommand(lsline)
                    if info._name != '.':  # svn 1.5 produces '.' dirs,
                        nameinfo_seq.append((info._name, info))
            nameinfo_seq.sort()
            return nameinfo_seq
        auth = self.auth and self.auth.makecmdoptions() or None
        if self.rev is not None:
            return self._lsrevcache.getorbuild((self.strpath, self.rev, auth),
                                               builder)
        else:
            return self._lsnorevcache.getorbuild((self.strpath, auth),
                                                 builder)

    def listdir(self, fil=None, sort=None):
        """ list directory contents, possibly filter by the given fil func
            and possibly sorted.
        """
        if isinstance(fil, str):
            fil = common.FNMatcher(fil)
        nameinfo_seq = self._listdir_nameinfo()
        if len(nameinfo_seq) == 1:
            name, info = nameinfo_seq[0]
            if name == self.basename and info.kind == 'file':
                #if not self.check(dir=1):
                raise py.error.ENOTDIR(self)
        paths = [self.join(name) for (name, info) in nameinfo_seq]
        if fil:
            paths = [x for x in paths if fil(x)]
        self._sortlist(paths, sort)
        return paths


    def log(self, rev_start=None, rev_end=1, verbose=False):
        """ return a list of LogEntry instances for this path.
rev_start is the starting revision (defaulting to the first one).
rev_end is the last revision (defaulting to HEAD).
if verbose is True, then the LogEntry instances also know which files changed.
"""
        assert self.check() #make it simpler for the pipe
        rev_start = rev_start is None and "HEAD" or rev_start
        rev_end = rev_end is None and "HEAD" or rev_end

        if rev_start == "HEAD" and rev_end == 1:
            rev_opt = ""
        else:
            rev_opt = "-r %s:%s" % (rev_start, rev_end)
        verbose_opt = verbose and "-v" or ""
        xmlpipe =  self._svnpopenauth('svn log --xml %s %s "%s"' %
                                      (rev_opt, verbose_opt, self.strpath))
        from xml.dom import minidom
        tree = minidom.parse(xmlpipe)
        result = []
        for logentry in filter(None, tree.firstChild.childNodes):
            if logentry.nodeType == logentry.ELEMENT_NODE:
                result.append(svncommon.LogEntry(logentry))
        return result

#01234567890123456789012345678901234567890123467
#   2256      hpk        165 Nov 24 17:55 __init__.py
# XXX spotted by Guido, SVN 1.3.0 has different aligning, breaks the code!!!
#   1312 johnny           1627 May 05 14:32 test_decorators.py
#
class InfoSvnCommand:
    # the '0?' part in the middle is an indication of whether the resource is
    # locked, see 'svn help ls'
    lspattern = re.compile(
        r'^ *(?P<rev>\d+) +(?P<author>.+?) +(0? *(?P<size>\d+))? '
            '*(?P<date>\w+ +\d{2} +[\d:]+) +(?P<file>.*)$')
    def __init__(self, line):
        # this is a typical line from 'svn ls http://...'
        #_    1127      jum        0 Jul 13 15:28 branch/
        match = self.lspattern.match(line)
        data = match.groupdict()
        self._name = data['file']
        if self._name[-1] == '/':
            self._name = self._name[:-1]
            self.kind = 'dir'
        else:
            self.kind = 'file'
        #self.has_props = l.pop(0) == 'P'
        self.created_rev = int(data['rev'])
        self.last_author = data['author']
        self.size = data['size'] and int(data['size']) or 0
        self.mtime = parse_time_with_missing_year(data['date'])
        self.time = self.mtime * 1000000

    def __eq__(self, other):
        return self.__dict__ == other.__dict__


#____________________________________________________
#
# helper functions
#____________________________________________________
def parse_time_with_missing_year(timestr):
    """ analyze the time part from a single line of "svn ls -v"
    the svn output doesn't show the year makes the 'timestr'
    ambigous.
    """
    import calendar
    t_now = time.gmtime()

    tparts = timestr.split()
    month = time.strptime(tparts.pop(0), '%b')[1]
    day = time.strptime(tparts.pop(0), '%d')[2]
    last = tparts.pop(0) # year or hour:minute
    try:
        if ":" in last:
            raise ValueError()
        year = time.strptime(last, '%Y')[0]
        hour = minute = 0
    except ValueError:
        hour, minute = time.strptime(last, '%H:%M')[3:5]
        year = t_now[0]

        t_result = (year, month, day, hour, minute, 0,0,0,0)
        if t_result > t_now:
            year -= 1
    t_result = (year, month, day, hour, minute, 0,0,0,0)
    return calendar.timegm(t_result)

class PathEntry:
    def __init__(self, ppart):
        self.strpath = ppart.firstChild.nodeValue.encode('UTF-8')
        self.action = ppart.getAttribute('action').encode('UTF-8')
        if self.action == 'A':
            self.copyfrom_path = ppart.getAttribute('copyfrom-path').encode('UTF-8')
            if self.copyfrom_path:
                self.copyfrom_rev = int(ppart.getAttribute('copyfrom-rev'))

