#!/usr/bin/env python
#
# Copyright (C) 2017 Igalia S.L.
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Library General Public
# License as published by the Free Software Foundation; either
# version 2 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# Library General Public License for more details.
#
# You should have received a copy of the GNU Library General Public License
# along with this library; see the file COPYING.LIB.  If not, write to
# the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
# Boston, MA 02110-1301, USA.

import hashlib
import optparse
import os
from webkitpy.common.host import Host

host = Host()
host.initialize_scm()
checkout_root = host.scm().checkout_root
layout_tests_directory = os.path.join(checkout_root, 'LayoutTests')
platform_directory = os.path.join(layout_tests_directory, 'platform')


def check_duplicate(platform, baseline_search_path, platform_test_result):
    def sha1(path):
        with file(path, 'rb') as f:
            return hashlib.sha1(f.read()).hexdigest()

    prefix_len = len(os.path.join(platform_directory, platform)) + 1
    test_result_filename = platform_test_result[prefix_len:]
    platform_test_result_size = None
    platform_test_result_sha1 = None

    baseline_found = False
    for baseline_path in baseline_search_path:
        baseline_test_result = os.path.join(baseline_path, test_result_filename)
        if not os.path.isfile(baseline_test_result):
            continue

        baseline_found = True
        if platform_test_result_size is None:
            platform_test_result_size = os.path.getsize(platform_test_result)
        baseline_test_result_size = os.path.getsize(baseline_test_result)
        if platform_test_result_size != baseline_test_result_size:
            return False

        if platform_test_result_sha1 is None:
            platform_test_result_sha1 = sha1(platform_test_result)
        baseline_test_result_sha1 = sha1(baseline_test_result)
        if platform_test_result_sha1 != baseline_test_result_sha1:
            return False

    return baseline_found


def platform_list(platform):
    if platform == 'all':
        return os.listdir(platform_directory)
    if os.path.isdir(os.path.join(platform_directory, platform)):
        return [platform]
    return []


option_parser = optparse.OptionParser(usage='usage: %prog [options]')
option_parser.add_option('-p', '--platform',
                         action='store', dest='platform', default='all',
                         help='Platform to check for duplicated results. By the default all platform are checked')
option_parser.add_option('-n', '--no-delete',
                         action='store_true', dest='no_delete',
                         help='Do not delete the duplicated results found from the repository, list them instead')
options, args = option_parser.parse_args()

total = 0
baseline_search_paths_checked = set()
for platform in platform_list(options.platform):
    try:
        port = host.port_factory.get(platform)
        baseline_search_path = tuple([p for p in port.baseline_search_path() if os.path.isdir(p)] + [layout_tests_directory])
    except:
        continue

    if baseline_search_path in baseline_search_paths_checked:
        continue
    baseline_search_paths_checked.add(baseline_search_path)

    duplicates = []
    for root, dirs, files in os.walk(baseline_search_path[0]):
        for file_name in files:
            platform_test_result = os.path.join(root, file_name)
            if check_duplicate(baseline_search_path[0], baseline_search_path[1:], platform_test_result):
                duplicates.append(platform_test_result)

    if not duplicates:
        continue
    if options.no_delete:
        print "\n".join(duplicates)
    else:
        host.scm().delete_list(duplicates)

    duplicates_len = len(duplicates)
    total += duplicates_len
    print '%d found in %s -> generic' % (duplicates_len, ' -> '.join([os.path.basename(p) for p in baseline_search_path[:-1]]))

if total:
    if not options.no_delete:
        print '%d files have been removed from the repository, check the status and commit if everything is correct' % (total)
else:
    print 'No duplicated results found'