# CVS conversion code inspired by hg-cvs-import and git-cvsimport

import os, locale, re, socket, errno
from cStringIO import StringIO
from mercurial import util
from mercurial.i18n import _

from common import NoRepo, commit, converter_source, checktool
import cvsps

class convert_cvs(converter_source):
    def __init__(self, ui, path, rev=None):
        super(convert_cvs, self).__init__(ui, path, rev=rev)

        cvs = os.path.join(path, "CVS")
        if not os.path.exists(cvs):
            raise NoRepo("%s does not look like a CVS checkout" % path)

        checktool('cvs')
        self.cmd = ui.config('convert', 'cvsps', 'builtin')
        cvspsexe = self.cmd.split(None, 1)[0]
        self.builtin = cvspsexe == 'builtin'

        if not self.builtin:
            checktool(cvspsexe)

        self.changeset = {}
        self.files = {}
        self.tags = {}
        self.lastbranch = {}
        self.parent = {}
        self.socket = None
        self.cvsroot = file(os.path.join(cvs, "Root")).read()[:-1]
        self.cvsrepo = file(os.path.join(cvs, "Repository")).read()[:-1]
        self.encoding = locale.getpreferredencoding()

        self._parse(ui)
        self._connect()

    def _parse(self, ui):
        if self.changeset:
            return

        maxrev = 0
        cmd = self.cmd
        if self.rev:
            # TODO: handle tags
            try:
                # patchset number?
                maxrev = int(self.rev)
            except ValueError:
                try:
                    # date
                    util.parsedate(self.rev, ['%Y/%m/%d %H:%M:%S'])
                    cmd = '%s -d "1970/01/01 00:00:01" -d "%s"' % (cmd, self.rev)
                except util.Abort:
                    raise util.Abort(_('revision %s is not a patchset number or date') % self.rev)

        d = os.getcwd()
        try:
            os.chdir(self.path)
            id = None
            state = 0
            filerevids = {}

            if self.builtin:
                # builtin cvsps code
                ui.status(_('using builtin cvsps\n'))

                db = cvsps.createlog(ui, cache='update')
                db = cvsps.createchangeset(ui, db,
                      fuzz=int(ui.config('convert', 'cvsps.fuzz', 60)),
                      mergeto=ui.config('convert', 'cvsps.mergeto', None),
                      mergefrom=ui.config('convert', 'cvsps.mergefrom', None))

                for cs in db:
                    if maxrev and cs.id>maxrev:
                        break
                    id = str(cs.id)
                    cs.author = self.recode(cs.author)
                    self.lastbranch[cs.branch] = id
                    cs.comment = self.recode(cs.comment)
                    date = util.datestr(cs.date)
                    self.tags.update(dict.fromkeys(cs.tags, id))

                    files = {}
                    for f in cs.entries:
                        files[f.file] = "%s%s" % ('.'.join([str(x) for x in f.revision]),
                                                  ['', '(DEAD)'][f.dead])

                    # add current commit to set
                    c = commit(author=cs.author, date=date,
                             parents=[str(p.id) for p in cs.parents],
                             desc=cs.comment, branch=cs.branch or '')
                    self.changeset[id] = c
                    self.files[id] = files
            else:
                # external cvsps
                for l in util.popen(cmd):
                    if state == 0: # header
                        if l.startswith("PatchSet"):
                            id = l[9:-2]
                            if maxrev and int(id) > maxrev:
                                # ignore everything
                                state = 3
                        elif l.startswith("Date:"):
                            date = util.parsedate(l[6:-1], ["%Y/%m/%d %H:%M:%S"])
                            date = util.datestr(date)
                        elif l.startswith("Branch:"):
                            branch = l[8:-1]
                            self.parent[id] = self.lastbranch.get(branch, 'bad')
                            self.lastbranch[branch] = id
                        elif l.startswith("Ancestor branch:"):
                            ancestor = l[17:-1]
                            # figure out the parent later
                            self.parent[id] = self.lastbranch[ancestor]
                        elif l.startswith("Author:"):
                            author = self.recode(l[8:-1])
                        elif l.startswith("Tag:") or l.startswith("Tags:"):
                            t = l[l.index(':')+1:]
                            t = [ut.strip() for ut in t.split(',')]
                            if (len(t) > 1) or (t[0] and (t[0] != "(none)")):
                                self.tags.update(dict.fromkeys(t, id))
                        elif l.startswith("Log:"):
                            # switch to gathering log
                            state = 1
                            log = ""
                    elif state == 1: # log
                        if l == "Members: \n":
                            # switch to gathering members
                            files = {}
                            oldrevs = []
                            log = self.recode(log[:-1])
                            state = 2
                        else:
                            # gather log
                            log += l
                    elif state == 2: # members
                        if l == "\n": # start of next entry
                            state = 0
                            p = [self.parent[id]]
                            if id == "1":
                                p = []
                            if branch == "HEAD":
                                branch = ""
                            if branch:
                                latest = None
                                # the last changeset that contains a base
                                # file is our parent
                                for r in oldrevs:
                                    latest = max(filerevids.get(r, None), latest)
                                if latest:
                                    p = [latest]

                            # add current commit to set
                            c = commit(author=author, date=date, parents=p,
                                       desc=log, branch=branch)
                            self.changeset[id] = c
                            self.files[id] = files
                        else:
                            colon = l.rfind(':')
                            file = l[1:colon]
                            rev = l[colon+1:-2]
                            oldrev, rev = rev.split("->")
                            files[file] = rev

                            # save some information for identifying branch points
                            oldrevs.append("%s:%s" % (oldrev, file))
                            filerevids["%s:%s" % (rev, file)] = id
                    elif state == 3:
                        # swallow all input
                        continue

            self.heads = self.lastbranch.values()
        finally:
            os.chdir(d)

    def _connect(self):
        root = self.cvsroot
        conntype = None
        user, host = None, None
        cmd = ['cvs', 'server']

        self.ui.status(_("connecting to %s\n") % root)

        if root.startswith(":pserver:"):
            root = root[9:]
            m = re.match(r'(?:(.*?)(?::(.*?))?@)?([^:\/]*)(?::(\d*))?(.*)',
                         root)
            if m:
                conntype = "pserver"
                user, passw, serv, port, root = m.groups()
                if not user:
                    user = "anonymous"
                if not port:
                    port = 2401
                else:
                    port = int(port)
                format0 = ":pserver:%s@%s:%s" % (user, serv, root)
                format1 = ":pserver:%s@%s:%d%s" % (user, serv, port, root)

                if not passw:
                    passw = "A"
                    cvspass = os.path.expanduser("~/.cvspass")
                    try:
                        pf = open(cvspass)
                        for line in pf.read().splitlines():
                            part1, part2 = line.split(' ', 1)
                            if part1 == '/1':
                                # /1 :pserver:user@example.com:2401/cvsroot/foo Ah<Z
                                part1, part2 = part2.split(' ', 1)
                                format = format1
                            else:
                                # :pserver:user@example.com:/cvsroot/foo Ah<Z
                                format = format0
                            if part1 == format:
                                passw = part2
                                break
                        pf.close()
                    except IOError, inst:
                        if inst.errno != errno.ENOENT:
                            if not getattr(inst, 'filename', None):
                                inst.filename = cvspass
                            raise

                sck = socket.socket()
                sck.connect((serv, port))
                sck.send("\n".join(["BEGIN AUTH REQUEST", root, user, passw,
                                    "END AUTH REQUEST", ""]))
                if sck.recv(128) != "I LOVE YOU\n":
                    raise util.Abort(_("CVS pserver authentication failed"))

                self.writep = self.readp = sck.makefile('r+')

        if not conntype and root.startswith(":local:"):
            conntype = "local"
            root = root[7:]

        if not conntype:
            # :ext:user@host/home/user/path/to/cvsroot
            if root.startswith(":ext:"):
                root = root[5:]
            m = re.match(r'(?:([^@:/]+)@)?([^:/]+):?(.*)', root)
            # Do not take Windows path "c:\foo\bar" for a connection strings
            if os.path.isdir(root) or not m:
                conntype = "local"
            else:
                conntype = "rsh"
                user, host, root = m.group(1), m.group(2), m.group(3)

        if conntype != "pserver":
            if conntype == "rsh":
                rsh = os.environ.get("CVS_RSH") or "ssh"
                if user:
                    cmd = [rsh, '-l', user, host] + cmd
                else:
                    cmd = [rsh, host] + cmd

            # popen2 does not support argument lists under Windows
            cmd = [util.shellquote(arg) for arg in cmd]
            cmd = util.quotecommand(' '.join(cmd))
            self.writep, self.readp = util.popen2(cmd, 'b')

        self.realroot = root

        self.writep.write("Root %s\n" % root)
        self.writep.write("Valid-responses ok error Valid-requests Mode"
                          " M Mbinary E Checked-in Created Updated"
                          " Merged Removed\n")
        self.writep.write("valid-requests\n")
        self.writep.flush()
        r = self.readp.readline()
        if not r.startswith("Valid-requests"):
            raise util.Abort(_("server sucks"))
        if "UseUnchanged" in r:
            self.writep.write("UseUnchanged\n")
            self.writep.flush()
            r = self.readp.readline()

    def getheads(self):
        return self.heads

    def _getfile(self, name, rev):

        def chunkedread(fp, count):
            # file-objects returned by socked.makefile() do not handle
            # large read() requests very well.
            chunksize = 65536
            output = StringIO()
            while count > 0:
                data = fp.read(min(count, chunksize))
                if not data:
                    raise util.Abort(_("%d bytes missing from remote file") % count)
                count -= len(data)
                output.write(data)
            return output.getvalue()

        if rev.endswith("(DEAD)"):
            raise IOError

        args = ("-N -P -kk -r %s --" % rev).split()
        args.append(self.cvsrepo + '/' + name)
        for x in args:
            self.writep.write("Argument %s\n" % x)
        self.writep.write("Directory .\n%s\nco\n" % self.realroot)
        self.writep.flush()

        data = ""
        while 1:
            line = self.readp.readline()
            if line.startswith("Created ") or line.startswith("Updated "):
                self.readp.readline() # path
                self.readp.readline() # entries
                mode = self.readp.readline()[:-1]
                count = int(self.readp.readline()[:-1])
                data = chunkedread(self.readp, count)
            elif line.startswith(" "):
                data += line[1:]
            elif line.startswith("M "):
                pass
            elif line.startswith("Mbinary "):
                count = int(self.readp.readline()[:-1])
                data = chunkedread(self.readp, count)
            else:
                if line == "ok\n":
                    return (data, "x" in mode and "x" or "")
                elif line.startswith("E "):
                    self.ui.warn(_("cvs server: %s\n") % line[2:])
                elif line.startswith("Remove"):
                    l = self.readp.readline()
                else:
                    raise util.Abort(_("unknown CVS response: %s") % line)

    def getfile(self, file, rev):
        data, mode = self._getfile(file, rev)
        self.modecache[(file, rev)] = mode
        return data

    def getmode(self, file, rev):
        return self.modecache[(file, rev)]

    def getchanges(self, rev):
        self.modecache = {}
        return util.sort(self.files[rev].items()), {}

    def getcommit(self, rev):
        return self.changeset[rev]

    def gettags(self):
        return self.tags

    def getchangedfiles(self, rev, i):
        return util.sort(self.files[rev].keys())
