# Copyright 2015 The Shaderc Authors. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

import expect
import os.path
from glslc_test_framework import inside_glslc_testsuite
from placeholder import FileShader, TempFileName


@inside_glslc_testsuite('OptionDashO')
class TestOptionDashOConcatenatedArg(expect.SuccessfulReturn,
                                     expect.CorrectObjectFilePreamble):
    """Tests that we can concatenate -o and the output filename."""

    shader = FileShader('#version 140\nvoid main() {}', '.vert')
    glslc_args = ['-ofoo', shader]

    def check_output_foo(self, status):
        output_name = os.path.join(status.directory, 'foo')
        return self.verify_object_file_preamble(output_name)


@inside_glslc_testsuite('OptionDashO')
class ManyOutputFilesWithDashO(expect.ErrorMessage):
    """Tests -o and -c with several files generates an error."""

    shader1 = FileShader('', '.vert')
    shader2 = FileShader('', '.frag')
    glslc_args = ['-o', 'foo', '-c', shader1, shader2]
    expected_error = [
        'glslc: error: cannot specify -o when '
        'generating multiple output files\n']


@inside_glslc_testsuite('OptionDashO')
class OutputFileLocation(expect.SuccessfulReturn,
                         expect.CorrectObjectFilePreamble):
    """Tests that the -o flag puts a file in a new location."""

    shader = FileShader('#version 310 es\nvoid main() {}', '.frag')
    glslc_args = [shader, '-o', TempFileName('a.out')]

    def check_output_a_out(self, status):
        output_name = os.path.join(status.directory, 'a.out')
        return self.verify_object_file_preamble(output_name)


@inside_glslc_testsuite('OptionDashO')
class DashOMissingArgumentIsAnError(expect.ErrorMessage):
    """Tests that -o without an argument is an error."""

    glslc_args = ['-o']
    expected_error = ['glslc: error: argument to \'-o\' is missing ' +
                      '(expected 1 value)\n']