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

# imports ####################################################################

import os

from sys import platform as _platform

if _platform == "darwin":
    try:
        from ._cocoa import _get_font
    except ImportError:
        pass

try:
    _get_font
except NameError:
    def _get_font(family, bold, italic):  # pylint: disable=function-redefined
        raise LookupError


# constants ##################################################################

_CONTRIBS_PATH = os.path.abspath(os.path.join(os.path.dirname(__file__),
                                              "..", "..",
                                              "contribs", "freefont-20120503"))

_FALLBACK_FONTS = {
    "sans-serif": {
        (False, False): os.path.join(_CONTRIBS_PATH, "FreeSans.otf"),
        (False, True):  os.path.join(_CONTRIBS_PATH, "FreeSansOblique.otf"),
        (True,  False): os.path.join(_CONTRIBS_PATH, "FreeSansBold.otf"),
        (True,  True):  os.path.join(_CONTRIBS_PATH, "FreeSansBoldOblique.otf"),
    },
    "serif": {
        (False, False): os.path.join(_CONTRIBS_PATH, "FreeSerif.otf"),
        (False, True):  os.path.join(_CONTRIBS_PATH, "FreeSerifItalic.otf"),
        (True,  False): os.path.join(_CONTRIBS_PATH, "FreeSerifBold.otf"),
        (True,  True):  os.path.join(_CONTRIBS_PATH, "FreeSerifBoldItalic.otf"),
    },
    "mono": {
        (False, False): os.path.join(_CONTRIBS_PATH, "FreeMono.otf"),
        (False, True):  os.path.join(_CONTRIBS_PATH, "FreeMonoOblique.otf"),
        (True,  False): os.path.join(_CONTRIBS_PATH, "FreeMonoBold.otf"),
        (True,  True):  os.path.join(_CONTRIBS_PATH, "FreeMonoBoldOblique.otf"),
    },
}


# font lookup ################################################################


def _get_fallback_font(family, bold=False, italic=False):
    return _FALLBACK_FONTS[family][bold, italic], 0


def get_font(families, weight="normal", style="normal"):
    bold = weight in ["bold", "bolder", "600", "700", "800", "900"]
    italic = style in ["italic", "oblique"]
    families = [family.strip() for family in families.split(',')] + ["sans-serif"]
    font_name, index = None, 0
    for font_getter in [_get_font, _get_fallback_font]:
        for family in families:
            try:
                font_name, index = font_getter(family, bold, italic)
            except LookupError:
                continue
            break
        else:
            continue
        break
    return font_name, index


__all__ = [
    "get_font",
]