# ----------------------------------------------------------------------------
# pyglet
# Copyright (c) 2006-2008 Alex Holkner
# Copyright (c) 2008-2020 pyglet contributors
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"""Load fonts.

pyglet will automatically load any system-installed fonts.  You can add additional fonts
(for example, from your program resources) using :meth:`add_file` or
:meth:`add_directory`. These fonts are then available in the same way as system-installed fonts::

    from pyglet import font
    font.add_file('action_man.ttf')
    action_man = font.load('Action Man', 16)
    # or
    from pyglet import resource
    resource.add_font('action_man.ttf')
    action_man = font.load('Action Man')

See the :mod:`pyglet.font.base` module for documentation on the base classes used
by this package.
"""
from __future__ import absolute_import, division
from builtins import str

import os
import sys
import weakref

import pyglet
from pyglet import gl

if not getattr(sys, 'is_pyglet_doc_run', False):
    if pyglet.compat_platform == 'darwin':
        from pyglet.font.quartz import QuartzFont
        _font_class = QuartzFont

    elif pyglet.compat_platform in ('win32', 'cygwin'):
        from pyglet.font.win32 import GDIPlusFont
        _font_class = GDIPlusFont

    else:
        from pyglet.font.freetype import FreeTypeFont
        _font_class = FreeTypeFont


def have_font(name):
    """Check if specified system font name is available."""
    return _font_class.have_font(name)


def load(name=None, size=None, bold=False, italic=False, dpi=None):
    """Load a font for rendering.

    :Parameters:
        `name` : str, or list of str
            Font family, for example, "Times New Roman".  If a list of names
            is provided, the first one matching a known font is used.  If no
            font can be matched to the name(s), a default font is used.  In
            pyglet 1.1, the name may be omitted.
        `size` : float
            Size of the font, in points.  The returned font may be an exact
            match or the closest available.  In pyglet 1.1, the size may be
            omitted, and defaults to 12pt.
        `bold` : bool
            If True, a bold variant is returned, if one exists for the given
            family and size.
        `italic` : bool
            If True, an italic variant is returned, if one exists for the given
            family and size.
        `dpi` : float
            The assumed resolution of the display device, for the purposes of
            determining the pixel size of the font.  Defaults to 96.

    :rtype: `Font`
    """
    # Arbitrary default size
    if size is None:
        size = 12

    if dpi is None:
        dpi = 96

    # Find first matching name
    if type(name) in (tuple, list):
        for n in name:
            if _font_class.have_font(n):
                name = n
                break
        else:
            name = None

    # Locate or create font cache
    shared_object_space = gl.current_context.object_space
    if not hasattr(shared_object_space, 'pyglet_font_font_cache'):
        shared_object_space.pyglet_font_font_cache = weakref.WeakValueDictionary()
        shared_object_space.pyglet_font_font_hold = []
    font_cache = shared_object_space.pyglet_font_font_cache
    font_hold = shared_object_space.pyglet_font_font_hold

    # Look for font name in font cache
    descriptor = (name, size, bold, italic, dpi)
    if descriptor in font_cache:
        return font_cache[descriptor]

    # Not in cache, create from scratch
    font = _font_class(name, size, bold=bold, italic=italic, dpi=dpi)

    # Save parameters for new-style layout classes to recover
    font.name = name
    font.size = size
    font.bold = bold
    font.italic = italic
    font.dpi = dpi

    # Cache font in weak-ref dictionary to avoid reloading while still in use
    font_cache[descriptor] = font

    # Hold onto refs of last three loaded fonts to prevent them being
    # collected if momentarily dropped.
    del font_hold[3:]
    font_hold.insert(0, font)

    return font


def add_file(font):
    """Add a font to pyglet's search path.

    In order to load a font that is not installed on the system, you must
    call this method to tell pyglet that it exists.  You can supply
    either a filename or any file-like object.

    The font format is platform-dependent, but is typically a TrueType font
    file containing a single font face. Note that to use a font added with this method,
    you should pass the face name (not the file name) to :meth::py:func:`pyglet.font.load` or any
    other place where you normally specify a font.

    :Parameters:
        `font` : str or file-like object
            Filename or file-like object to load fonts from.

    """
    if isinstance(font, str):
        font = open(font, 'rb')
    if hasattr(font, 'read'):
        font = font.read()
    _font_class.add_font_data(font)


def add_directory(directory):
    """Add a directory of fonts to pyglet's search path.

    This function simply calls :meth:`pyglet.font.add_file` for each file with a ``.ttf``
    extension in the given directory. Subdirectories are not searched.

    :Parameters:
        `dir` : str
            Directory that contains font files.

    """
    for file in os.listdir(directory):
        if file[-4:].lower() == '.ttf':
            add_file(os.path.join(directory, file))


__all__ = ('add_file', 'add_directory', 'load', 'have_font')
