import importer, re, string
from gourmet import check_encodings
from gourmet.gdebug import debug
from gettext import gettext as _

class TextImporter (importer.Importer):
    ATTR_DICT = {'Recipe By':'source',
                 'Serving Size':'servings',
                 'Preparation Time':'preptime',
                 'Categories':'category',
                 }

    end_of_paragraph_length = 60

    def __init__ (self, filename, conv=None):
        self.fn = filename
        self.rec = {}
        self.ing = {}
        self.compile_regexps()
        importer.Importer.__init__(self,conv=conv)

    def pre_run (self):
        self.lines = check_encodings.get_file(self.fn)
        self.total_lines = len(self.lines)
        print 'we have ',self.total_lines,'lines in file',self.fn
        
    def do_run (self):
        if not hasattr(self,'lines'):
            raise Exception("pre_run has not been run!")
        for n in range(self.total_lines):
            l=self.lines[n]
            if n % 15 == 0:
                prog = float(n)/float(self.total_lines)
                msg = _("Imported %s recipes.")%(len(self.added_recs))
                self.emit('progress',prog,msg)
            self.handle_line(l)
        # commit the last rec if need be
        if self.rec:
            self.commit_rec()
        importer.Importer.do_run(self)

    def handle_line (self):
        raise NotImplementedError

    def compile_regexps (self):
        self.blank_matcher = re.compile("^\s*$")
        # out unwrap regexp looks for a line with no meaningful characters, or a line that starts in
        # ALLCAPS or a line that is only space. (we use this with .split() to break text up into
        # paragraph breaks.
        self.unwrap_matcher = re.compile('\n\W*\n')
        self.find_header_breaks_matcher = re.compile('\s+(?=[A-Z][A-Z][A-Z]+:.*)')
        
    def unwrap_lines (self, blob):
        if blob.find("") >= 0:
            debug('Using built-in paragraph markers',1)
            # then we have paragraph markers in the text already
            outblob = string.join(blob.split("\n")," ") # get rid of line breaks
            lines = outblob.split("") # split text up into paragraphs
            outblob = string.join(lines,"\n") # insert linebreaks where paragraphs where
            return outblob
        outblob = ""
        newline = True
        for l in blob.split('\n'):
            debug('examining %s'%l,3)
            if re.match('^\W*$',l):
                # ignore repeated nonword characters (hyphens, stars, etc.)
                outblob += "\n"
                continue
            # if we have a non-word character at the start of the line,
            # we assume we need to keep the newline.
            if len(l)>=3 and re.match('(\W|[0-9])',l[2]):
                debug('Match non-word character; add newline before: %s'%l,4)
                outblob += "\n"
                outblob += l
                newline = False
                continue
            # if we are continuing an old line, we add a space
            # (because we're generally stripping all spaces when
            # we write)
            if not newline: outblob += " "
            hmatch = self.find_header_breaks_matcher.search(l)
            if hmatch:
                # if there's a header in the middle, we go ahead
                # and start a new line
                debug('Splitting at header in line: %s'%l,4)
                outblob += l[:hmatch.start()]
                outblob += "\n"
                outblob += l[hmatch.start():]
                continue
            #else...
            outblob += l.strip()
            if len(l) < self.end_of_paragraph_length: #60 is our hard-coded end-o-paragraph length
                debug('line < %s characters, adding newline.'%self.end_of_paragraph_length,4)
                outblob += "\n"
                newline = True
            else:
                newline = False
        return outblob
        
class Tester (importer.Tester):
    def __init__ (self):
        importer.Tester.__init__(self,regexp=MASTERCOOK_START_REGEXP)
        self.not_me = "<[?]?(xml|mx2|RcpE|RTxt)[^>]*>"

    def test (self, filename):
        """Test file named filename.

        filename can also be a file object.
        """
        if not hasattr(self,'matcher'):
            self.matcher=re.compile(self.regexp)
            self.not_matcher = re.compile(self.not_me)
        if type(self.ofi)==str: self.ofi = open(filename,'r')
        l = self.ofi.readline()
        while l:
            if self.not_matcher.match(l):
                self.ofi.close()
                return False
            if self.matcher.match(l):
                self.ofi.close()
                return True
            l = self.ofi.readline()
        self.ofi.close()
