# Copyright (C) 2012 Google Inc. All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
#     * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
#     * 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.
#     * Neither the name of Google Inc. nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# 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 CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

"""Run Inspector's perf tests in perf mode."""

import os
import json
import logging
import optparse
import time
import datetime

from webkitpy.common import find_files
from webkitpy.common.checkout.scm.detection import SCMDetector
from webkitpy.common.config.urls import view_source_url
from webkitpy.common.host import Host
from webkitpy.common.net.file_uploader import FileUploader
from webkitpy.performance_tests.perftest import PerfTestFactory
from webkitpy.performance_tests.perftest import DEFAULT_TEST_RUNNER_COUNT


_log = logging.getLogger(__name__)


class PerfTestsRunner(object):
    _default_branch = 'webkit-trunk'
    EXIT_CODE_BAD_BUILD = -1
    EXIT_CODE_BAD_SOURCE_JSON = -2
    EXIT_CODE_BAD_MERGE = -3
    EXIT_CODE_FAILED_UPLOADING = -4
    EXIT_CODE_BAD_PREPARATION = -5

    _DEFAULT_JSON_FILENAME = 'PerformanceTestsResults.json'

    def __init__(self, args=None, port=None):
        self._options, self._args = PerfTestsRunner._parse_args(args)
        if port:
            self._port = port
            self._host = self._port.host
        else:
            self._host = Host()
            self._port = self._host.port_factory.get(self._options.platform, self._options)
        self._host.initialize_scm()
        self._webkit_base_dir_len = len(self._port.webkit_base())
        self._base_path = self._port.perf_tests_dir()
        self._timestamp = time.time()
        self._utc_timestamp = datetime.datetime.utcnow()


    @staticmethod
    def _parse_args(args=None):
        def _expand_path(option, opt_str, value, parser):
            path = os.path.expandvars(os.path.expanduser(value))
            setattr(parser.values, option.dest, path)
        perf_option_list = [
            optparse.make_option('--debug', action='store_const', const='Debug', dest="configuration",
                help='Set the configuration to Debug'),
            optparse.make_option('--release', action='store_const', const='Release', dest="configuration",
                help='Set the configuration to Release'),
            optparse.make_option("--platform",
                help="Specify port/platform being tested (i.e. chromium-mac)"),
            optparse.make_option("--builder-name",
                help=("The name of the builder shown on the waterfall running this script e.g. google-mac-2.")),
            optparse.make_option("--build-number",
                help=("The build number of the builder running this script.")),
            optparse.make_option("--build", dest="build", action="store_true", default=True,
                help="Check to ensure the DumpRenderTree build is up-to-date (default)."),
            optparse.make_option("--no-build", dest="build", action="store_false",
                help="Don't check to see if the DumpRenderTree build is up-to-date."),
            optparse.make_option("--build-directory",
                help="Path to the directory under which build files are kept (should not include configuration)"),
            optparse.make_option("--time-out-ms", default=600 * 1000,
                help="Set the timeout for each test"),
            optparse.make_option("--no-results", action="store_false", dest="generate_results", default=True,
                help="Do no generate results JSON and results page."),
            optparse.make_option("--output-json-path", action='callback', callback=_expand_path, type="str",
                help="Path to generate a JSON file at; may contain previous results if it already exists."),
            optparse.make_option("--reset-results", action="store_true",
                help="Clears the content in the generated JSON file before adding the results."),
            optparse.make_option("--slave-config-json-path", action='callback', callback=_expand_path, type="str",
                help="Only used on bots. Path to a slave configuration file."),
            optparse.make_option("--description",
                help="Add a description to the output JSON file if one is generated"),
            optparse.make_option("--no-show-results", action="store_false", default=True, dest="show_results",
                help="Don't launch a browser with results after the tests are done"),
            optparse.make_option("--test-results-server",
                help="Upload the generated JSON file to the specified server when --output-json-path is present."),
            optparse.make_option("--webkit-test-runner", "-2", action="store_true",
                help="Use WebKitTestRunner rather than DumpRenderTree."),
            optparse.make_option("--replay", dest="replay", action="store_true", default=False,
                help="Run replay tests."),
            optparse.make_option("--force", dest="use_skipped_list", action="store_false", default=True,
                help="Run all tests, including the ones in the Skipped list."),
            optparse.make_option("--profile", action="store_true",
                help="Output per-test profile information."),
            optparse.make_option("--profiler", action="store",
                help="Output per-test profile information, using the specified profiler."),
            optparse.make_option("--additional-drt-flag", action="append",
                default=[], help="Additional command line flag to pass to DumpRenderTree "
                     "Specify multiple times to add multiple flags."),
            optparse.make_option("--driver-name", type="string",
                help="Alternative DumpRenderTree binary to use"),
            optparse.make_option("--repeat", default=1, type="int",
                help="Specify number of times to run test set (default: 1)."),
            optparse.make_option("--test-runner-count", default=DEFAULT_TEST_RUNNER_COUNT, type="int",
                help="Specify number of times to invoke test runner for each performance test."),
            ]
        return optparse.OptionParser(option_list=(perf_option_list)).parse_args(args)

    def _collect_tests(self):
        test_extensions = ['.html', '.svg']
        if self._options.replay:
            test_extensions.append('.replay')

        def _is_test_file(filesystem, dirname, filename):
            return filesystem.splitext(filename)[1] in test_extensions

        filesystem = self._host.filesystem

        paths = []
        for arg in self._args:
            if filesystem.exists(filesystem.join(self._base_path, arg)):
                paths.append(arg)
            else:
                relpath = filesystem.relpath(arg, self._base_path)
                if filesystem.exists(filesystem.join(self._base_path, relpath)):
                    paths.append(filesystem.normpath(relpath))
                else:
                    _log.warn('Path was not found:' + arg)

        skipped_directories = set(['.svn', 'resources'])
        test_files = find_files.find(filesystem, self._base_path, paths, skipped_directories, _is_test_file)
        tests = []
        for path in test_files:
            relative_path = filesystem.relpath(path, self._base_path).replace('\\', '/')
            if self._options.use_skipped_list and self._port.skips_perf_test(relative_path) and filesystem.normpath(relative_path) not in paths:
                continue
            test = PerfTestFactory.create_perf_test(self._port, relative_path, path, test_runner_count=self._options.test_runner_count)
            tests.append(test)

        return tests

    def _start_http_servers(self):
        self._port.acquire_http_lock()
        self._port.start_http_server(number_of_servers=2)

    def _stop_http_servers(self):
        self._port.stop_http_server()
        self._port.release_http_lock()

    def run(self):
        needs_http = self._port.requires_http_server()

        if not self._port.check_build(needs_http=needs_http):
            _log.error("Build not up to date for %s" % self._port._path_to_driver())
            return self.EXIT_CODE_BAD_BUILD

        run_count = 0
        repeat = self._options.repeat
        while (run_count < repeat):
            run_count += 1

            tests = self._collect_tests()
            runs = ' (Run %d of %d)' % (run_count, repeat) if repeat > 1 else ''
            _log.info("Running %d tests%s" % (len(tests), runs))

            for test in tests:
                if not test.prepare(self._options.time_out_ms):
                    return self.EXIT_CODE_BAD_PREPARATION

            try:
                if needs_http:
                    self._start_http_servers()
                unexpected = self._run_tests_set(sorted(list(tests), key=lambda test: test.test_name()))

            finally:
                if needs_http:
                    self._stop_http_servers()

            if self._options.generate_results and not self._options.profile:
                exit_code = self._generate_results()
                if exit_code:
                    return exit_code

        if self._options.generate_results and not self._options.profile:
            test_results_server = self._options.test_results_server
            if test_results_server and not self._upload_json(test_results_server, self._output_json_path()):
                return self.EXIT_CODE_FAILED_UPLOADING

            if self._options.show_results:
                self._port.show_results_html_file(self._results_page_path())

        return unexpected

    def _output_json_path(self):
        output_json_path = self._options.output_json_path
        if output_json_path:
            return output_json_path
        return self._host.filesystem.join(self._port.perf_results_directory(), self._DEFAULT_JSON_FILENAME)

    def _results_page_path(self):
        return self._host.filesystem.splitext(self._output_json_path())[0] + '.html'

    def _generate_results(self):
        options = self._options
        output_json_path = self._output_json_path()
        output = self._generate_results_dict(self._timestamp, options.description, options.platform, options.builder_name, options.build_number)

        if options.slave_config_json_path:
            output = self._merge_slave_config_json(options.slave_config_json_path, output)
            if not output:
                return self.EXIT_CODE_BAD_SOURCE_JSON

        output = self._merge_outputs_if_needed(output_json_path, output)
        if not output:
            return self.EXIT_CODE_BAD_MERGE

        filesystem = self._host.filesystem
        json_output = json.dumps(output)
        filesystem.write_text_file(output_json_path, json_output)

        template_path = filesystem.join(self._port.perf_tests_dir(), 'resources/results-template.html')
        template = filesystem.read_text_file(template_path)

        absolute_path_to_trunk = filesystem.dirname(self._port.perf_tests_dir())
        results_page = template.replace('%AbsolutePathToWebKitTrunk%', absolute_path_to_trunk)
        results_page = results_page.replace('%PeformanceTestsResultsJSON%', json_output)

        filesystem.write_text_file(self._results_page_path(), results_page)

    def _generate_results_dict(self, timestamp, description, platform, builder_name, build_number):
        revisions = {}
        for (name, path) in self._port.repository_paths():
            scm = SCMDetector(self._host.filesystem, self._host.executive).detect_scm_system(path) or self._host.scm()
            revision = scm.svn_revision(path)
            revisions[name] = {'revision': revision, 'timestamp': scm.timestamp_of_revision(path, revision)}

        meta_info = {
            'description': description,
            'buildTime': self._datetime_in_ES5_compatible_iso_format(self._utc_timestamp),
            'platform': platform,
            'revisions': revisions,
            'builderName': builder_name,
            'buildNumber': int(build_number) if build_number else None}

        contents = {'tests': {}}
        for key, value in meta_info.items():
            if value:
                contents[key] = value

        for test, metrics in self._results:
            for metric_name, iteration_values in metrics.iteritems():
                if not isinstance(iteration_values, list):  # We can't reports results without individual measurements.
                    continue

                tests = contents['tests']
                path = test.test_name_without_file_extension().split('/')
                for i in range(0, len(path)):
                    is_last_token = i + 1 == len(path)
                    url = view_source_url('PerformanceTests/' + (test.test_name() if is_last_token else '/'.join(path[0:i + 1])))
                    tests.setdefault(path[i], {'url': url})
                    current_test = tests[path[i]]
                    if is_last_token:
                        current_test.setdefault('metrics', {})
                        assert metric_name not in current_test['metrics']
                        current_test['metrics'][metric_name] = {'current': iteration_values}
                    else:
                        current_test.setdefault('tests', {})
                        tests = current_test['tests']

        return contents

    @staticmethod
    def _datetime_in_ES5_compatible_iso_format(datetime):
        return datetime.strftime('%Y-%m-%dT%H:%M:%S.%f')

    def _merge_slave_config_json(self, slave_config_json_path, contents):
        if not self._host.filesystem.isfile(slave_config_json_path):
            _log.error("Missing slave configuration JSON file: %s" % slave_config_json_path)
            return None

        try:
            slave_config_json = self._host.filesystem.open_text_file_for_reading(slave_config_json_path)
            slave_config = json.load(slave_config_json)
            for key in slave_config:
                contents['builder' + key.capitalize()] = slave_config[key]
            return contents
        except Exception, error:
            _log.error("Failed to merge slave configuration JSON file %s: %s" % (slave_config_json_path, error))
        return None

    def _merge_outputs_if_needed(self, output_json_path, output):
        if self._options.reset_results or not self._host.filesystem.isfile(output_json_path):
            return [output]
        try:
            existing_outputs = json.loads(self._host.filesystem.read_text_file(output_json_path))
            return existing_outputs + [output]
        except Exception, error:
            _log.error("Failed to merge output JSON file %s: %s" % (output_json_path, error))
        return None

    def _upload_json(self, test_results_server, json_path, host_path="/api/report", file_uploader=FileUploader):
        url = "https://%s%s" % (test_results_server, host_path)
        uploader = file_uploader(url, 120)
        try:
            response = uploader.upload_single_text_file(self._host.filesystem, 'application/json', json_path)
        except Exception, error:
            _log.error("Failed to upload JSON file to %s in 120s: %s" % (url, error))
            return False

        response_body = [line.strip('\n') for line in response]
        if response_body != ['OK']:
            try:
                parsed_response = json.loads('\n'.join(response_body))
            except:
                _log.error("Uploaded JSON to %s but got a bad response:" % url)
                for line in response_body:
                    _log.error(line)
                return False
            if parsed_response.get('status') != 'OK':
                _log.error("Uploaded JSON to %s but got an error:" % url)
                _log.error(json.dumps(parsed_response, indent=4))
                return False

        _log.info("JSON file uploaded to %s." % url)
        return True

    def _run_tests_set(self, tests):
        result_count = len(tests)
        failures = 0
        self._results = []

        for i, test in enumerate(tests):
            _log.info('Running %s (%d of %d)' % (test.test_name(), i + 1, len(tests)))
            start_time = time.time()
            metrics = test.run(self._options.time_out_ms)
            if metrics:
                self._results.append((test, metrics))
            else:
                failures += 1
                _log.error('FAILED')

            _log.info('Finished: %f s' % (time.time() - start_time))
            _log.info('')

        return failures
