# Copyright 2017 The Meson development team

# 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.

from mesonbuild import environment

import sys, os, subprocess, pathlib

def remove_dir_from_trace(lcov_command, covfile, dirname):
    tmpfile = covfile + '.tmp'
    subprocess.check_call([lcov_command, '--remove', covfile, dirname, '-o', tmpfile])
    os.replace(tmpfile, covfile)

def coverage(source_root, build_root, log_dir):
    (gcovr_exe, lcov_exe, genhtml_exe) = environment.find_coverage_tools()
    if gcovr_exe:
        subprocess.check_call([gcovr_exe,
                               '-x',
                               '-r', source_root,
                               '-o', os.path.join(log_dir, 'coverage.xml'),
                               ])
        subprocess.check_call([gcovr_exe,
                               '-r', source_root,
                               '-o', os.path.join(log_dir, 'coverage.txt'),
                               ])
    if lcov_exe and genhtml_exe:
        htmloutdir = os.path.join(log_dir, 'coveragereport')
        covinfo = os.path.join(log_dir, 'coverage.info')
        initial_tracefile = covinfo + '.initial'
        run_tracefile = covinfo + '.run'
        subprocess.check_call([lcov_exe,
                               '--directory', build_root,
                               '--capture',
                               '--initial',
                               '--output-file',
                               initial_tracefile])
        subprocess.check_call([lcov_exe,
                               '--directory', build_root,
                               '--capture',
                               '--output-file', run_tracefile,
                               '--no-checksum',
                               '--rc', 'lcov_branch_coverage=1',
                               ])
        # Join initial and test results.
        subprocess.check_call([lcov_exe,
                               '-a', initial_tracefile,
                               '-a', run_tracefile,
                               '-o', covinfo])
        remove_dir_from_trace(lcov_exe, covinfo, '/usr/include/*')
        remove_dir_from_trace(lcov_exe, covinfo, '/usr/local/include/*')
        remove_dir_from_trace(lcov_exe, covinfo, '/usr/src/*')
        remove_dir_from_trace(lcov_exe, covinfo, '/usr/lib/llvm-*/include/*')
        subprocess.check_call([genhtml_exe,
                               '--prefix', build_root,
                               '--output-directory', htmloutdir,
                               '--title', 'Code coverage',
                               '--legend',
                               '--show-details',
                               '--branch-coverage',
                               covinfo])
    if gcovr_exe:
        print('')
        print('XML coverage report can be found at',
              pathlib.Path(log_dir, 'coverage.xml').as_uri())
        print('Text coverage report can be found at',
              pathlib.Path(log_dir, 'coverage.txt').as_uri())
    if lcov_exe and genhtml_exe:
        print('Html coverage report can be found at',
              pathlib.Path(htmloutdir, 'index.html').as_uri())
    return 0

def run(args):
    if not os.path.isfile('build.ninja'):
        print('Coverage currently only works with the Ninja backend.')
        return 1
    source_root, build_root, log_dir = args[:]
    return coverage(source_root, build_root, log_dir)

if __name__ == '__main__':
    sys.exit(run(sys.argv[1:]))