#!/usr/bin/env python

# Copyright 2017 Google Inc.
#
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

import fnmatch
import multiprocessing
import os
import subprocess
import sys

'''
If called with arguments, this script will verify that those headers are
self-sufficient and idempotent.

Otherwise, test all checked-in headers except for those in the ignore list.
'''

public_header_args = [
    '-Iinclude/core',
    '-Iinclude/config',
    '-Iinclude/android',
    '-Iinclude/codec',
    '-Iinclude/effects',
    '-Iinclude/gpu',
    '-Iinclude/gpu/gl',
    '-Iinclude/pathops',
    '-Iinclude/ports',
    '-Iinclude/private',
    '-Iinclude/svg',
    '-Iinclude/third_party/vulkan',
    '-Iinclude/utils',
    '-Iinclude/utils/mac',
    '-Iinclude/views',
]

all_header_args = [
    '-Iinclude/core',
    '-Iinclude/config',
    '-Iinclude/android',
    '-Iinclude/c',
    '-Iinclude/codec',
    '-Iinclude/effects',
    '-Iinclude/gpu',
    '-Iinclude/gpu/gl',
    '-Iinclude/pathops',
    '-Iinclude/ports',
    '-Iinclude/private',
    '-Iinclude/svg',
    '-Iinclude/third_party/vulkan',
    '-Iinclude/utils',
    '-Iinclude/utils/mac',
    '-Iinclude/views',
    '-Isrc/codec',
    '-Isrc/core',
    '-Isrc/effects',
    '-Isrc/effects/gradients',
    '-Isrc/fonts',
    '-Isrc/gpu',
    '-Isrc/image',
    '-Isrc/images',
    '-Isrc/lazy',
    '-Isrc/opts',
    '-Isrc/pathops',
    '-Isrc/ports',
    '-Isrc/sfnt',
    '-Isrc/shaders',
    '-Isrc/sksl',
    '-Isrc/utils',
    '-Isrc/utils/win',
    '-Isrc/xml',
    '-Igm',
    '-Itests',
    '-Itools',
    '-Itools/debugger',
    '-Itools/flags',
    '-Itools/gpu',
    '-Itools/timer',
    '-Ithird_party/etc1',
    '-Ithird_party/externals/libjpeg-turbo',
    '-Ithird_party/externals/sfntly/cpp/src',
    '-Ithird_party/externals/zlib',
    '-Ithird_party/gif',
]

ignore = [
    '*/lex.*.h',
    '*/osmesa_wrapper.h',
    'debugger/QT/*',
    'example/*',
    'experimental/*',
    'include/config/*',
    'include/core/SkPostConfig.h',
    'include/gpu/vk/*',
    'include/ports/SkFontMgr_android.h',
    'include/ports/SkFontMgr_fontconfig.h',
    'include/ports/SkTypeface_win.h',
    'include/private/*_impl.h',
    'include/utils/mac/SkCGUtils.h',
    'include/views/SkOSWindow_*.h',
    'src/c/sk_c_from_to.h',
    'src/core/*Template.h',
    'src/core/SkBitmapProcState_*.h',
    'src/core/SkLinearBitmapPipeline.h',
    'src/core/SkLinearBitmapPipeline_*.h',
    'src/gpu/vk/*',
    'src/opts/*_SSE2.h',
    'src/opts/*_SSSE3.h',
    'src/opts/*_neon.h',
    'src/opts/*_sse.h',
    'src/opts/Sk4px_*.h',
    'src/ports/*',
    'src/utils/*_win.h',
    'src/utils/win/*',
    'src/views/*',
    'third_party/*',
    'tools/fiddle/*',
    'tools/viewer/*',
]

# test header for self-sufficiency and idempotency.
# Returns a string containing errors, or None iff there are no errors.
def compile_header(header):
    args = ([]                 if fnmatch.fnmatch(header, 'include/c/*') else
            public_header_args if fnmatch.fnmatch(header, 'include/*')   else
            all_header_args)
    cmd = ['c++', '--std=c++14'] + args + [ '-o', '/dev/null', '-c', '-x', 'c++', '-']
    proc = subprocess.Popen(cmd, stdin=subprocess.PIPE,
                            stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
    proc.stdin.write('#include "%s"\n#include "%s"\n' % (header, header))
    proc.stdin.close()
    errors = proc.stdout.read().strip()
    if proc.wait() != 0 or len(errors) > 0:
        return '\n\033[7m ERROR: %s \033[0m\n%s\n\n' % (header, errors)
    return None

#     for h in headers:
#         compile_header(h)
# ...Except use a multiprocessing pool.
# Exit at first error.
def compile_headers(headers):
    class N: good = True
    # N.good is a global scoped to this function to make a print_and_exit_if() a closure
    pool = multiprocessing.Pool()
    def print_and_exit_if(r):
        if r is not None:
            sys.stdout.write(r)
            N.good = False
            pool.terminate()
    for path in headers:
        assert os.path.exists(path)
        pool.apply_async(compile_header, args=(path, ), callback=print_and_exit_if)
    pool.close()
    pool.join()
    if N.good:
        sys.stdout.write('all good :)\n')
    else:
        exit(1)


def main(argv):
    skia_dir = os.path.join(os.path.dirname(__file__), os.pardir)
    if len(argv) > 1:
        paths = [os.path.relpath(os.path.abspath(arg), skia_dir) for arg in argv[1:]]
        os.chdir(skia_dir)
    else:
        os.chdir(skia_dir)
        paths = [path for path in subprocess.check_output(['git', 'ls-files']).splitlines()
                 if path.endswith('.h')
                 and not any(fnmatch.fnmatch(path, pattern) for pattern in ignore)]
    compile_headers(paths)


if __name__ == '__main__':
    main(sys.argv)