# -*- coding: utf-8 -*-

import sys
import csv
from itertools import izip

# https://pypi.python.org/pypi/unicodecsv
# http://semver.org/
VERSION = (0, 9, 4)
__version__ = ".".join(map(str, VERSION))

pass_throughs = [
    'register_dialect',
    'unregister_dialect',
    'get_dialect',
    'list_dialects',
    'field_size_limit',
    'Dialect',
    'excel',
    'excel_tab',
    'Sniffer',
    'QUOTE_ALL',
    'QUOTE_MINIMAL',
    'QUOTE_NONNUMERIC',
    'QUOTE_NONE',
    'Error'
]
__all__ = [
    'reader',
    'writer',
    'DictReader',
    'DictWriter',
] + pass_throughs

for prop in pass_throughs:
    globals()[prop] = getattr(csv, prop)


def _stringify(s, encoding, errors):
    if s is None:
        return ''
    if isinstance(s, unicode):
        return s.encode(encoding, errors)
    elif isinstance(s, (int, float)):
        pass  # let csv.QUOTE_NONNUMERIC do its thing.
    elif not isinstance(s, str):
        s = str(s)
    return s


def _stringify_list(l, encoding, errors='strict'):
    try:
        return [_stringify(s, encoding, errors) for s in iter(l)]
    except TypeError, e:
        raise csv.Error(str(e))


def _unicodify(s, encoding):
    if s is None:
        return None
    if isinstance(s, (unicode, int, float)):
        return s
    elif isinstance(s, str):
        return s.decode(encoding)
    return s


class UnicodeWriter(object):

    """
    >>> import unicodecsv
    >>> from cStringIO import StringIO
    >>> f = StringIO()
    >>> w = unicodecsv.writer(f, encoding='utf-8')
    >>> w.writerow((u'é', u'ñ'))
    >>> f.seek(0)
    >>> r = unicodecsv.reader(f, encoding='utf-8')
    >>> row = r.next()
    >>> row[0] == u'é'
    True
    >>> row[1] == u'ñ'
    True
    """

    def __init__(self, f, dialect=csv.excel, encoding='utf-8', errors='strict',
                 *args, **kwds):
        self.encoding = encoding
        self.writer = csv.writer(f, dialect, *args, **kwds)
        self.encoding_errors = errors

    def writerow(self, row):
        self.writer.writerow(
            _stringify_list(row, self.encoding, self.encoding_errors))

    def writerows(self, rows):
        for row in rows:
            self.writerow(row)

    @property
    def dial
f):
        return self.writer.dialect
writer = UnicodeWriter


class UnicodeReader(object):

    def __init__(self, f, dialect=None, encoding='utf-8', errors='strict',
                 **kwds):
        format_params = ['delimiter', 'doublequote', 'escapechar',
                         'lineterminator', 'quotechar', 'quoting', 'skipinitialspace']
        if dialect is None:
            if not any([kwd_name in format_params for kwd_name in kwds.keys()]):
                dialect = csv.excel
        self.reader = csv.reader(f, dialect, **kwds)
        self.encoding = encoding
        self.encoding_errors = errors

    def next(self):
        row = self.reader.next()
        encoding = self.encoding
        encoding_errors = self.encoding_errors
        float_ = float
        unicode_ = unicode
        try:
            val = [(value if isinstance(value, float_) else unicode_(value, encoding, encoding_errors))
                   for value in row]
        except UnicodeDecodeError as e:
            # attempt a different encoding...
            encoding = 'ISO-8859-1'
            val = [(value if isinstance(value, float_) else unicode_(value, encoding, encoding_errors))
                   for value in row]
        return val

    def __iter__(self):
        return self

    @property
    def dialect(self):
        return self.reader.dialect

    @property
    def line_num(self):
        return self.reader.line_num
reader = UnicodeReader


class DictWriter(csv.DictWriter):

    """
    >>> from cStringIO import StringIO
    >>> f = StringIO()
    >>> w = DictWriter(f, ['a', u'ñ', 'b'], restval=u'î')
    >>> w.writerow({'a':'1', u'ñ':'2'})
    >>> w.writerow({'a':'1', u'ñ':'2', 'b':u'ø'})
    >>> w.writerow({'a':u'é', u'ñ':'2'})
    >>> f.seek(0)
    >>> r = DictReader(f, fieldnames=['a', u'ñ'], restkey='r')
    >>> r.next() == {'a': u'1', u'ñ':'2', 'r': [u'î']}
    True
    >>> r.next() == {'a': u'1', u'ñ':'2', 'r': [u'\xc3\xb8']}
    True
    >>> r.next() == {'a': u'\xc3\xa9', u'ñ':'2', 'r': [u'\xc3\xae']}
    True
    """

    def __init__(self, csvfile, fieldnames, restval='', extrasaction='raise', dialect='excel', encoding='utf-8', errors='strict', *args, **kwds):
        self.encoding = encoding
        csv.DictWriter.__init__(
            self, csvfile, fieldnames, restval, extrasaction, dialect, *args, **kwds)
        self.writer = UnicodeWriter(
            csvfile, dialect, encoding=encoding, errors=errors, *args, **kwds)
        self.encoding_errors = errors

    def writeheader(self):
        fieldnames = _stringify_list(
            self.fieldnames, self.encoding, self.encoding_errors)
        header = dict(zip(self.fieldnames, self.fieldnames))
        self.writerow(header)


class DictReader(csv.DictReader):

    """
    >>> from cStringIO import StringIO
    >>> f = StringIO()
    >>> w = DictWriter(f, fieldnames=['name', 'place'])
    >>> w.writerow({'name': 'Cary Grant', 'place': 'hollywood'})
    >>> w.writerow({'name': 'Nathan Brillstone', 'place': u'øLand'})
    >>> w.writerow({'name': u'Willam ø. Unicoder', 'place': u'éSpandland'})
    >>> f.seek(0)
    >>> r = DictReader(f, fieldnames=['name', 'place'])
    >>> print r.next() == {'name': 'Cary Grant', 'place': 'hollywood'}
    True
    >>> print r.next() == {'name': 'Nathan Brillstone', 'place': u'øLand'}
    True
    >>> print r.next() == {'name': u'Willam ø. Unicoder', 'place': u'éSpandland'}
    True
    """

    def __init__(self, csvfile, fieldnames=None, restkey=None, restval=None,
                 dialect='excel', encoding='utf-8', errors='strict', *args,
                 **kwds):
        if fieldnames is not None:
            fieldnames = _stringify_list(fieldnames, encoding)
        csv.DictReader.__init__(
            self, csvfile, fieldnames, restkey, restval, dialect, *args, **kwds)
        self.reader = UnicodeReader(csvfile, dialect, encoding=encoding,
                                    errors=errors, *args, **kwds)
        if fieldnames is None and not hasattr(csv.DictReader, 'fieldnames'):
            # Python 2.5 fieldnames workaround.
            # (http://bugs.python.org/issue3436)
            reader = UnicodeReader(
                csvfile, dialect, encoding=encoding, *args, **kwds)
            self.fieldnames = _stringify_list(reader.next(), reader.encoding)
        self.unicode_fieldnames = [_unicodify(f, encoding) for f in
                                   self.fieldnames]
        self.unicode_restkey = _unicodify(restkey, encoding)

    def next(self):
        row = csv.DictReader.next(self)
        result = dict((uni_key, row[str_key]) for (str_key, uni_key) in
                      izip(self.fieldnames, self.unicode_fieldnames))
        rest = row.get(self.restkey)
        if rest:
            result[self.unicode_restkey] = rest
        return result

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