# Copyright 2023 The Pigweed Authors
#
# 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
#
#     https://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.
"""Utilities for saving logs."""

from recipe_engine import recipe_api


class SaveLogsApi(recipe_api.RecipeApi):
    """Utilities for saving logs."""

    def __call__(self, dirs, export_dir=None, pres=None):
        """Save common build logs from the build directory.

        Read common build logs so they appear in logdog and if export_dir is
        set copy these logs there. If there's a ninja log call
        log_longest_build_steps() on it.
        """

        globs = [
            '**/pip_install_log.txt',
            '*.bat',
            '*.compdb',
            '*.gn',
            '*.graph',
            '*.json',
            '*.log',
            '*.sh',
            '*.txt',
            '*/*.cfg',
            '*/*.ensure',
            '*/*.json',
            '*/*.log',
            '*/*.txt',
            '*_log',
            'coverage_reports/*.tar.gz',
        ]
        self.m.path.mock_add_file(dirs[0] / '.ninja_log')
        self.m.path.mock_add_file(dirs[0] / 'coverage_reports' / 'foo.tar.gz')
        self.m.path.mock_add_file(dirs[0] / 'failure-summary.log')
        self.m.path.mock_add_file(dirs[0] / 'links.json')

        found_files = set()

        with self.m.step.nest('logs'):
            with self.m.step.nest('glob'):
                for glob in globs:
                    test_data = []
                    if glob == '*.log':
                        test_data = [
                            '.ninja_log',
                            'coverage_reports/foo.tar.gz',
                            'failure-summary.log',
                            'links.json',
                            'links.json',
                        ]

                    for dir in dirs:
                        found_files.update(
                            self.m.file.glob_paths(
                                glob,
                                dir,
                                glob,
                                include_hidden=True,
                                test_data=test_data,
                            )
                        )

            # Read these files and discard them so contents will be in logdog.
            ninja_log = None
            failure_summary_log = None
            for path in sorted(found_files):
                if not self.m.path.isfile(path):
                    continue  # pragma: no cover
                name = self.m.path.basename(path)

                test_data = ''
                if name == '.ninja_log':
                    test_data = (
                        '2000 5000 0 medium 0\n'
                        '3000 8000 0 long 0\n'
                        'malformed line\n'
                        '4000 5000 0 short 0\n'
                        '5000 x 0 malformed-end-time 0\n'
                    )

                elif name == 'failure-summary.log':
                    test_data = '[5/10] foo.c\nerror: ???\n'

                elif name == 'links.json':
                    test_data = [
                        {'description': 'description', 'url': 'https://url',},
                    ]

                # No need to defer results here, but since some callers will be
                # deferring results and others won't this makes it so we always
                # need to call .get_result().
                with self.m.step.defer_results():
                    if name.endswith('.json'):
                        read_func = self.m.file.read_json
                    elif name.endswith(('.gz', '.bz2')):
                        read_func = self.m.file.read_raw
                    else:
                        read_func = self.m.file.read_text

                    contents = read_func(name, path, test_data=test_data)

                    if name == '.ninja_log':
                        ninja_log = contents.get_result()
                    elif name in (
                        'failure-summary.log',
                        'ninja-failure-summary.log',
                    ):
                        failure_summary_log = contents.get_result()
                    elif name == 'links.json':
                        if pres:
                            for entry in contents.get_result():
                                pres.links[entry['description']] = entry['url']

        if failure_summary_log:
            with self.m.step.nest('failure summary') as fail_pres:
                fail_pres.step_summary_text = self.m.buildbucket_util.summary_message(
                    failure_summary_log,
                    '(truncated, see "full contents" for details)',
                )
                fail_pres.status = 'FAILURE'
                fail_pres.logs['full contents'] = failure_summary_log

        if ninja_log:
            self.log_longest_build_steps(ninja_log)

        if export_dir and found_files:
            log_dir = export_dir / 'build_logs'
            self.m.file.ensure_directory('mkdir build_logs', log_dir)
            with self.m.step.nest('copy'):
                for path in sorted(found_files):
                    name = self.m.path.basename(path)
                    self.m.file.copy(name, path, log_dir / name)

    def log_longest_build_steps(self, ninja_log):
        """Parse the build log and log the longest-running build steps."""
        steps = []
        for line in ninja_log.splitlines():
            try:
                start_ms, end_ms, _, name, _ = line.split()
                duration = (int(end_ms) - int(start_ms)) / 1000.0
                steps.append((duration, name))
            except (ValueError, TypeError):
                # This processing is best-effort and should never be the cause
                # of a build failure. In case there's something wrong with this
                # logfile silently ignore the error--in that case it's very
                # likely something else also went wrong and that should be the
                # error presented to the user.
                pass

        steps.sort(reverse=True)

        if steps:
            with self.m.step.nest('longest build steps'):
                for dur, name in steps[0:10]:
                    with self.m.step.nest(name) as pres:
                        pres.step_summary_text = f'{dur:.1f}s'