#!/usr/bin/env python2
# vim:fileencoding=utf-8
from __future__ import (unicode_literals, division, absolute_import,
                        print_function)

__license__ = 'GPL v3'
__copyright__ = '2014, Kovid Goyal <kovid at kovidgoyal.net>'

from tinycss.decoding import decode
from tinycss.tests import BaseTest

def params(css, encoding, use_bom=False, expect_error=False, **kwargs):
    """Nicer syntax to make a tuple."""
    return css, encoding, use_bom, expect_error, kwargs

class TestDecoding(BaseTest):

    def test_decoding(self):
        for (css, encoding, use_bom, expect_error, kwargs) in [
            params('', 'utf8'),  # default to utf8
            params('𐂃', 'utf8'),
            params('é', 'latin1'),  # utf8 fails, fall back on ShiftJIS
            params('£', 'ShiftJIS', expect_error=True),
            params('£', 'ShiftJIS', protocol_encoding='Shift-JIS'),
            params('£', 'ShiftJIS', linking_encoding='Shift-JIS'),
            params('£', 'ShiftJIS', document_encoding='Shift-JIS'),
            params('£', 'ShiftJIS', protocol_encoding='utf8',
                                document_encoding='ShiftJIS'),
            params('@charset "utf8"; £', 'ShiftJIS', expect_error=True),
            params('@charset "utf£8"; £', 'ShiftJIS', expect_error=True),
            params('@charset "unknown-encoding"; £', 'ShiftJIS', expect_error=True),
            params('@charset "utf8"; £', 'ShiftJIS', document_encoding='ShiftJIS'),
            params('£', 'ShiftJIS', linking_encoding='utf8',
                                document_encoding='ShiftJIS'),
            params('@charset "utf-32"; 𐂃', 'utf-32-be'),
            params('@charset "Shift-JIS"; £', 'ShiftJIS'),
            params('@charset "ISO-8859-8"; £', 'ShiftJIS', expect_error=True),
            params('𐂃', 'utf-16-le', expect_error=True),  # no BOM
            params('𐂃', 'utf-16-le', use_bom=True),
            params('𐂃', 'utf-32-be', expect_error=True),
            params('𐂃', 'utf-32-be', use_bom=True),
            params('𐂃', 'utf-32-be', document_encoding='utf-32-be'),
            params('𐂃', 'utf-32-be', linking_encoding='utf-32-be'),
            params('@charset "utf-32-le"; 𐂃', 'utf-32-be',
                use_bom=True, expect_error=True),
            # protocol_encoding takes precedence over @charset
            params('@charset "ISO-8859-8"; £', 'ShiftJIS',
                protocol_encoding='Shift-JIS'),
            params('@charset "unknown-encoding"; £', 'ShiftJIS',
                protocol_encoding='Shift-JIS'),
            params('@charset "Shift-JIS"; £', 'ShiftJIS',
                protocol_encoding='utf8'),
            # @charset takes precedence over document_encoding
            params('@charset "Shift-JIS"; £', 'ShiftJIS',
                document_encoding='ISO-8859-8'),
            # @charset takes precedence over linking_encoding
            params('@charset "Shift-JIS"; £', 'ShiftJIS',
                linking_encoding='ISO-8859-8'),
            # linking_encoding takes precedence over document_encoding
            params('£', 'ShiftJIS',
                linking_encoding='Shift-JIS', document_encoding='ISO-8859-8'),
        ]:
            if use_bom:
                source = '\ufeff' + css
            else:
                source = css
            css_bytes = source.encode(encoding)
            result, result_encoding = decode(css_bytes, **kwargs)
            if expect_error:
                self.assertNotEqual(result, css)
            else:
                self.ae(result, css)
