# coding=utf-8
# Copyright (c) 2014-2016 Intel Corporation

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"""Provides a few simple helpers for working with mako templates."""

from __future__ import absolute_import
import os
import sys
import getpass
import tempfile
import platform

import mako
from mako.template import Template
from mako.lookup import TemplateLookup


# Based on a similar setup in framework/summary
if platform.system() == "Windows":
    MAKO_TEMP_DIR = tempfile.gettempdir()
else:
    MAKO_TEMP_DIR = os.path.join(tempfile.gettempdir(),
                                 getpass.getuser(),
                                 'piglit',
                                 'python-{}'.format(sys.version.split()[0]),
                                 'mako-{}'.format(mako.__version__),
                                 'generators')

TEMPLATE_DIR = os.path.abspath(os.path.dirname(__file__))

# Future functions to be used in all templates
_FUTURES = ['division']


def template_file(generator, template):
    """Get a single template file from the templates directory.

    If the generator uses more than one template use template_dir instead.

    Arguments:
    generator -- the name of the generator, which coresponds to the subdir of
                 the templates folder.
    template -- the name of the template to get. If getting a single template
                it's probably template.*.mako, where * is shader_test,
                glsl_parser_test, vert, frag, geom, etc.

    """
    assert os.path.sep not in generator, \
        'generator should be a filename, not a path'
    assert not generator.endswith('.py'), \
        'generator should not have a file extension'

    return Template(filename=os.path.join(TEMPLATE_DIR, generator, template),
                    module_directory=os.path.join(MAKO_TEMP_DIR, generator),
                    future_imports=_FUTURES,
                    output_encoding='utf-8')


def template_dir(generator):
    """Get a TemplateLookup object for a generator.

    This is useful if a generator uses more than one template.

    Arguments:
    generator -- the name of the generator, which coresponds to the subdir of
                 the templates folder.

    """
    assert os.path.sep not in generator, \
        'generator should be a filename, not a path'
    assert not generator.endswith('.py'), \
        'generator should not have a file extension'

    return TemplateLookup(
        directories=[os.path.join(TEMPLATE_DIR, generator)],
        module_directory=os.path.join(MAKO_TEMP_DIR, generator),
        future_imports=_FUTURES,
        output_encoding='utf-8')
