"""
gadict dictionary format parser.
"""

import sys
import regex


class Prelude:
    """Dictionary metainfo structure."""
    name = None
    about = ""
    urls = []
    authors = []
    licences = []


class ParseException(BaseException):

    def __init__(self, msg, lineno=None, line=None):
        BaseException.__init__(self)
        self.msg = msg
        self.lineno = lineno
        self.line = line

    def __repr__(self):
        if self.lineno is None:
            return self.msg
        elif self.line is None:
            return ":{:d}:{:s}".format(self.lineno, self.msg.encode('utf-8'))
        else:
            return ":{:d}: {:s}\nLINE: {:s}".format(self.lineno, self.msg.encode('utf-8'), self.line.encode('utf-8'))

class Headword:

    def __init__(self, headword, pron = None, attrs = None):
        self.headword = headword
        self.pron = pron
        self.attrs = attrs

    def __str__(self):
        return self.headword
    def __repr__(self):
        return "<Headword {}>".format(self.headword)

class Sense:

    def __init__(self, pos, tr_list = None, ex_list = None, syn_list = None, ant_list = None, topic_list = None):
        if not pos:
            raise ParseException("Part of speech expected...\n")
        self.pos = pos
        self.tr_list = tr_list
        if not tr_list:
            self.tr_list = []
        self.ex_list = ex_list
        self.syn_list = syn_list
        self.ant_list = ant_list
        self.topic_list = topic_list

    def add_tr(self, tr):
        self.tr_list.append(tr)

    def add_ex(self, ex):
        if not self.ex_list:
            self.ex_list = [ex]
        else:
            self.ex_list.append(ex)

    def add_syn(self, syn):
        if not self.syn_list:
            self.syn_list = [syn]
        else:
            self.syn_list.append(syn)

    def add_ant(self, ant):
        if not self.ant_list:
            self.ant_list = [ant]
        else:
            self.ant_list.append(ant)

    def add_topic(self, topic):
        if not self.topic_list:
            self.topic_list = [topic]
        else:
            self.topic_list.append(topic)

    def __str__(self):
        if tr_list:
            (lang, text) = self.tr_list[0]
            return "{}: {}".format(lang, text)
        return "<empy sence>"
    def __repr__(self):
        return "<Sence {}>".format(str(self))

class Parser:
    """gadict dictionary format parser."""

    COMMENT_RE = regex.compile(r"^# ")

    SEPARATOR_RE = regex.compile(u"^__$")
    HEADWORD_RE = regex.compile( u"^(\\p{L}.*)$" )
    HEADWORD_VAR_RE = regex.compile(u"^ +(s|pl|v[123]|male|female|comp|super|abbr|Am|Br|Au)$")
    HEADWORD_PRON_RE = regex.compile(u"^ +\\[([\p{L}' ]+)\\]$")
    TRANSL_POS_RE = regex.compile(u"^n|det|pron|adj|v|adv|prep|conj|num|int|phr|phr\\.v|contr|abbr|prefix$")
    TRANSL_RE = regex.compile(u"^(ru|uk|la|en): ([\\p{L}(].*)$")
    TRANSL_EX_RE = regex.compile(u"^(ru|uk|la|en)> ([-\\p{L}].*)$")
    TOPIC_RE = regex.compile(u"^topic: (\\p{L}.*)$")
    SYN_RE = regex.compile(u"^syn: (\\p{L}.*)$")
    ANT_RE = regex.compile(u"^ant: (\\p{L}.*)$")

    CONT_RE = regex.compile(u"^ +(.*)")

    TRAILING_SPACES_RE = regex.compile(u"\\p{Z}+$")

    PRELUDE_NAME_RE = regex.compile(u"^name: (.*)")
    PRELUDE_URL_RE = regex.compile(u"^url: (.*)")
    PRELUDE_AUTHOR_RE = regex.compile(u"^by: (.*)")
    PRELUDE_LICENSE_RE = regex.compile(u"^term: (.*)")
    PRELUDE_ABOUT_RE = regex.compile(u"^about: ?(.*)")

    def __init__(self):
        pass

    def readline(self):
        while True:
            self.line = self.stream.readline()
            self.eof = len(self.line) == 0
            if not self.eof:
                self.lineno += 1
            if self.TRAILING_SPACES_RE.search(self.line):
                raise ParseException("Traling spaces detected...\n")
            if self.COMMENT_RE.search(self.line):
                continue
            break

    def parse(self, stream):
        self.lineno = 0
        self.stream = stream
        self.dom = []
        try:
            self.parse_prelude()
            while not self.eof:
                self.parse_article()
        except ParseException as ex:
            if sys.version_info.major == 2:
                import traceback
                traceback.print_exc()
            raise ParseException(ex.msg, self.lineno, self.line)
        return self.dom

    def parse_prelude_continuation(self):
        string = ""
        while True:
            self.readline()
            if self.eof:
                return string
            m = self.CONT_RE.match(self.line)
            if m is not None:
                string += "\n" + m.group(1)
            elif len(self.line) == 1:
                string += "\n"
            else:
                return string

    def parse_prelude(self):
        """Read dictionary prelude until first "__" delimiter."""
        pre = Prelude()
        while True:
            self.readline()
            if self.eof:
                raise ParseException("There are no articles...")
            m = self.PRELUDE_ABOUT_RE.match(self.line)
            if m:
                pre.about += m.group(1) + self.parse_prelude_continuation()
                if self.eof:
                    raise ParseException("There are no articles...")
            if self.SEPARATOR_RE.match(self.line):
                break
            m = self.PRELUDE_NAME_RE.match(self.line)
            if m:
                pre.name = m.group(1)
                continue
            m = self.PRELUDE_URL_RE.match(self.line)
            if m:
                pre.urls.append(m.group(1))
                continue
            m = self.PRELUDE_AUTHOR_RE.match(self.line)
            if m:
                pre.authors.append(m.group(1))
                continue
            m = self.PRELUDE_LICENSE_RE.match(self.line)
            if m:
                pre.licences.append(m.group(1))
                continue
        self.dom.append(pre)

    def parse_article(self):
        """Try to match article until next "__" delimiter. Assume that `self.line` point to "__" delimiter."""
        self.words = None
        self.tran = None
        self.parse_empty_line()
        self.parse_headlines()
        self.parse_translation()
        self.dom.append((self.words, self.tran))

    def parse_empty_line(self):
        self.readline()
        if self.eof or len(self.line) != 1:
            raise ParseException(""""__" delimiter should followed by empty line...""")

    def parse_headlines(self):
        """Try to match word variations with attributed. Assume that `self.line` on preceding empty line."""
        self.words = []
        self.readline()
        if self.eof:
            raise ParseException("""There are no definition after "__" delimiter...""")
        m = self.HEADWORD_RE.match(self.line)
        if m is None:
            raise ParseException("""There are no headword after "__" delimiter...""")
        word = m.group(1)
        pron = None
        attrs = set()
        while True:
            self.readline()
            if self.eof or len(self.line) == 1:
                break
            m = self.HEADWORD_RE.match(self.line)
            if m is not None:
                if word is None:
                    raise ParseException("""Didn't match previous headword...""")
                self.words.append(Headword(word, pron, attrs))
                word = m.group(1)
                pron = None
                attrs = set()
                continue
            m = self.HEADWORD_PRON_RE.match(self.line)
            if m is not None:
                if pron is not None:
                    raise ParseException("""Pronunciation is redefined...""")
                pron = m.group(1)
                continue
            m = self.HEADWORD_VAR_RE.match(self.line)
            if m is not None:
                attrs.add(m.group(1))
                continue
            raise ParseException("""Line is not a headword or translation or headword attribute...""")
        self.words.append(Headword(word, pron, attrs))

    def parse_translation_continuation(self):
        string = ""
        while True:
            self.readline()
            if self.eof:
                return string
            m = self.CONT_RE.match(self.line)
            if m is not None:
                string += "\n" + m.group(1)
            else:
                return string

    def parse_translation(self):
        senses = []
        sense = None
        read = True
        while True:
            if read:
                self.readline()
            read = True
            if self.eof:
                break
            m = self.SEPARATOR_RE.match(self.line)
            if m is not None:
                if sense:
                    senses.append(sense)
                break
            if len(self.line) == 1:
                if sense:
                    senses.append(sense)
                sense = None
                continue
            m = self.TRANSL_POS_RE.match(self.line)
            if m is not None:
                if sense is not None:
                    raise ParseException("""Each translation should have only one part of speech marker...""")
                pos = m.group(0)
                sense = Sense(pos)
                continue
            if not sense:
                raise ParseException("""Missing part of speech marker...""")
            m = self.TOPIC_RE.match(self.line)
            if m is not None:
                topics = m.group(1).split(";")
                for topic in topics:
                    topic = topic.strip()
                    if len(topic) == 0:
                        raise ParseException("""Empty topic...""")
                    sense.add_topic(topic)
                continue
            m = self.SYN_RE.match(self.line)
            if m is not None:
                syns = m.group(1).split(";")
                for syn in syns:
                    syn = syn.strip()
                    if len(syn) == 0:
                        raise ParseException("""Empty synonym...""")
                    sense.add_syn(syn)
                continue
            m = self.ANT_RE.match(self.line)
            if m is not None:
                ants = m.group(1).split(";")
                for ant in ants:
                    ant = ant.strip()
                    if len(ant) == 0:
                        raise ParseException("""Empty antonym...""")
                    sense.add_ant(ant)
                continue
            m = self.TRANSL_RE.match(self.line)
            if m is not None:
                sense.add_tr((m.group(1), m.group(2) + self.parse_translation_continuation()))
                read = False
                continue
            m = self.TRANSL_EX_RE.match(self.line)
            if m is not None:
                sense.add_ex((m.group(1), m.group(2) + self.parse_translation_continuation()))
                read = False
                continue
            raise ParseException("""Uknown syntax...""")
        self.tran = senses