#!/usr/bin/env python
# SPDX-License-Identifier: BSD-2-Clause
""" Read log file and create *.gcda files. """

# Copyright (C) 2022 embedded brains GmbH (http://www.embedded-brains.de)
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
#    notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
#    notice, this list of conditions and the following disclaimer in the
#    documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
# AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
# LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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# POSSIBILITY OF SUCH DAMAGE.

import base64
import os 
import subprocess
import sys 
import tempfile


def _longest_common_prefix(names):
    names = sorted(names)
    try:
        shortest = names[0]
    except KeyError:
        return ""
    prefix = ""
    longest = names[-1]
    for idx, char in enumerate(shortest):
        if longest[idx] == char:
            prefix += char
        else:
            break
    return prefix


gcov_info = {}
for name in sys.argv[1:]:
    with open(name, "r") as log:
        after = log.read().split("*** BEGIN OF GCOV INFO ***")[1]
        before = after.split("*** END OF GCOV INFO ***")[0]
        for block in before.split("\n\n"):
            if block:
                gcov_file, gcov_data = block.split("\n", 1)
                gcov_info[gcov_file] = base64.b64decode(gcov_data)
prefix = _longest_common_prefix(gcov_info.keys())
with tempfile.TemporaryDirectory() as tmp_dir:
    for gcov_file, gcov_data in gcov_info.items():
        name = os.path.join(tmp_dir, gcov_file[len(prefix):])
        print(name)
        os.makedirs(os.path.dirname(name), exist_ok=True)
        with open(name, "wb") as out:
            out.write(gcov_data)
    subprocess.run(["gcov-tool", "merge", "-v", "-o", prefix, prefix, tmp_dir])