from os.path import dirname as dn, join as jn

from pidlock import LockHeld, DaemonLock

from pylons_app.config.environment import load_environment

from pylons_app.model.hg_model import HgModel

from shutil import rmtree

from webhelpers.html.builder import escape

from vcs.utils.lazy import LazyProperty

from whoosh.analysis import RegexTokenizer, LowercaseFilter, StopFilter

from whoosh.fields import TEXT, ID, STORED, Schema, FieldType

from whoosh.index import create_in, open_dir

from whoosh.formats import Characters

from whoosh.highlight import highlight, SimpleFragmenter, HtmlFormatter   

import os

import sys

import traceback

#to get the pylons_app import

sys.path.append(dn(dn(dn(os.path.realpath(__file__)))))

#LOCATION WE KEEP THE INDEX

IDX_LOCATION = jn(dn(dn(dn(dn(os.path.abspath(__file__))))), 'data', 'index')

#EXTENSIONS WE WANT TO INDEX CONTENT OFF

INDEX_EXTENSIONS = ['action', 'adp', 'ashx', 'asmx', 'aspx', 'asx', 'axd', 'c',

                    'cfg', 'cfm', 'cpp', 'cs', 'css', 'diff', 'do', 'el', 'erl',

                    'h', 'htm', 'html', 'ini', 'java', 'js', 'jsp', 'jspx', 'lisp',

                    'lua', 'm', 'mako', 'ml', 'pas', 'patch', 'php', 'php3',

                    'php4', 'phtml', 'pm', 'py', 'rb', 'rst', 's', 'sh', 'sql',

                    'tpl', 'txt', 'vim', 'wss', 'xhtml', 'xml', 'xsl', 'xslt',

                    'yaws']

#CUSTOM ANALYZER wordsplit + lowercase filter

ANALYZER = RegexTokenizer(expression=r"\w+") | LowercaseFilter()

#INDEX SCHEMA DEFINITION

SCHEMA = Schema(owner=TEXT(),

                repository=TEXT(stored=True),

                path=ID(stored=True, unique=True),

                content=FieldType(format=Characters(ANALYZER),

                             scorable=True, stored=True),

                modtime=STORED(), extension=TEXT(stored=True))

IDX_NAME = 'HG_INDEX'

FORMATTER = HtmlFormatter('span', between='\n<span class="break">...</span>\n') 

FRAGMENTER = SimpleFragmenter(200)

class ResultWrapper(object):

    def __init__(self, searcher, matcher, highlight_items):

        self.searcher = searcher

        self.matcher = matcher

        self.highlight_items = highlight_items

    @LazyProperty

    def doc_ids(self):

        docs_id = []

        while self.matcher.is_active():

            docnum = self.matcher.id()

            self.matcher.next()

        return docs_id   

    def __str__(self):

        return '<%s at %s>' % (self.__class__.__name__, len(self.doc_ids))

    def __repr__(self):

        return self.__str__()

    def __len__(self):

        return len(self.doc_ids)

    def __iter__(self):

        """

        Allows Iteration over results,and lazy generate content

        *Requires* implementation of ``__getitem__`` method.

        """

        for docid in self.doc_ids:

            yield self.get_full_content(docid)

    def __getslice__(self, i, j):

        """

        Slicing of resultWrapper

        """

        slice = []

        for docid in self.doc_ids[i:j]:

            slice.append(self.get_full_content(docid))

        return slice   

    def get_full_content(self, docid):

        f_path = res['path'][res['path'].find(res['repository']) \

                             + len(res['repository']):].lstrip('/')

        res.update({'content_short':content_short,

                    'content_short_hl':self.highlight(content_short),

                    'f_path':f_path})

        return res        

        """

        Smart function that implements chunking the content

        but not overlap chunks so it doesn't highlight the same

        close occurences twice.

        @param matcher:

        @param size:

        """

        memory = [(0, 0)]

        for span in self.matcher.spans():

            start = span.startchar or 0

            end = span.endchar or 0

            start_offseted = max(0, start - self.fragment_size)

            end_offseted = end + self.fragment_size

            if start_offseted < memory[-1][1]:

                start_offseted = memory[-1][1]

            memory.append((start_offseted, end_offseted,))    

    def highlight(self, content, top=5):

        hl = highlight(escape(content),

                 self.highlight_items,

                 analyzer=ANALYZER,

                 fragmenter=FRAGMENTER,

                 formatter=FORMATTER,

                 top=top)

        return hl