# Copyright (c) 2020 PaddlePaddle Authors. All Rights Reserved.
#
# 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
#
#     http://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.
""" For the PR that only modified the unit test, get cases in pull request. """

import os
import json
import re
import sys
import time
import subprocess
import requests
from github import Github

PADDLE_ROOT = os.getenv('PADDLE_ROOT', '/paddle/')
PADDLE_ROOT += '/'
PADDLE_ROOT = PADDLE_ROOT.replace('//', '/')


class PRChecker(object):
    """ PR Checker. """

    def __init__(self):
        self.github = Github(os.getenv('GITHUB_API_TOKEN'), timeout=60)
        self.repo = self.github.get_repo('PaddlePaddle/Paddle')
        self.py_prog_oneline = re.compile('\d+\|\s*#.*')
        self.py_prog_multiline_a = re.compile('\d+\|\s*r?""".*?"""', re.DOTALL)
        self.py_prog_multiline_b = re.compile("\d+\|\s*r?'''.*?'''", re.DOTALL)
        self.cc_prog_online = re.compile('\d+\|\s*//.*')
        self.cc_prog_multiline = re.compile('\d+\|\s*/\*.*?\*/', re.DOTALL)
        self.lineno_prog = re.compile('@@ \-\d+,\d+ \+(\d+),(\d+) @@')
        self.pr = None
        self.suffix = ''
        self.full_case = False

    def init(self):
        """ Get pull request. """
        pr_id = os.getenv('GIT_PR_ID')
        if not pr_id:
            print('PREC No PR ID')
            exit(0)
        suffix = os.getenv('PREC_SUFFIX')
        if suffix:
            self.suffix = suffix
        self.pr = self.repo.get_pull(int(pr_id))
        last_commit = None
        ix = 0
        while True:
            commits = self.pr.get_commits().get_page(ix)
            for c in commits:
                last_commit = c.commit
            else:
                break
            ix = ix + 1
        if last_commit.message.find('test=allcase') != -1:
            print('PREC test=allcase is set')
            self.full_case = True

    #todo: exception
    def __wget_with_retry(self, url):
        ix = 1
        proxy = '--no-proxy'
        while ix < 6:
            if ix // 2 == 0:
                proxy = ''
            else:
                proxy = '--no-proxy'
            code = subprocess.call(
                'wget -q {} --no-check-certificate {}'.format(proxy, url),
                shell=True)
            if code == 0:
                return True
            print(
                'PREC download {} error, retry {} time(s) after {} secs.[proxy_option={}]'.
                format(url, ix, ix * 10, proxy))
            time.sleep(ix * 10)
            ix += 1
        return False

    def get_pr_files(self):
        """ Get files in pull request. """
        page = 0
        file_list = []
        while True:
            files = self.pr.get_files().get_page(page)
            if not files:
                break
            for f in files:
                file_list.append(PADDLE_ROOT + f.filename)
            page += 1
        return file_list

    def __get_comment_by_filetype(self, content, filetype):
        result = []
        if filetype == 'py':
            result = self.__get_comment_by_prog(content, self.py_prog_oneline)
            result.extend(
                self.__get_comment_by_prog(content, self.py_prog_multiline_a))
            result.extend(
                self.__get_comment_by_prog(content, self.py_prog_multiline_b))
        if filetype == 'cc':
            result = self.__get_comment_by_prog(content, self.cc_prog_oneline)
            result.extend(
                self.__get_comment_by_prog(content, self.cc_prog_multiline))
        return result

    def __get_comment_by_prog(self, content, prog):
        result_list = prog.findall(content)
        if not result_list:
            return []
        result = []
        for u in result_list:
            result.extend(u.split('\n'))
        return result

    def get_comment_of_file(self, f):
        #content = self.repo.get_contents(f.replace(PADDLE_ROOT, ''), 'pull/').decoded_content
        #todo: get file from github
        with open(f) as fd:
            lines = fd.readlines()
        lineno = 1
        inputs = ''
        for line in lines:
            #for line in content.split('\n'):
            #input += str(lineno) + '|' + line + '\n'
            inputs += str(lineno) + '|' + line
            lineno += 1
        fietype = ''
        if f.endswith('.h') or f.endswith('.cc') or f.endswith('.cu'):
            filetype = 'cc'
        if f.endswith('.py'):
            filetype = 'py'
        else:
            return []
        return self.__get_comment_by_filetype(inputs, filetype)

    def get_pr_diff_lines(self):
        file_to_diff_lines = {}
        r = requests.get(self.pr.diff_url)
        data = r.text
        data = data.split('\n')
        ix = 0
        while ix < len(data):
            if data[ix].startswith('+++'):
                if data[ix].rstrip('\r\n') == '+++ /dev/null':
                    ix += 1
                    continue
                filename = data[ix][6:]
                ix += 1
                while ix < len(data):
                    result = self.lineno_prog.match(data[ix])
                    if not result:
                        break
                    lineno = int(result.group(1))
                    length = int(result.group(2))
                    ix += 1
                    end = ix + length
                    while ix < end:
                        if data[ix][0] == '-':
                            end += 1
                        if data[ix][0] == '+':
                            line_list = file_to_diff_lines.get(filename)
                            line = '{}{}'.format(lineno,
                                                 data[ix].replace('+', '|', 1))
                            if line_list:
                                line_list.append(line)
                            else:
                                file_to_diff_lines[filename] = [line, ]
                        if data[ix][0] != '-':
                            lineno += 1
                        ix += 1
            ix += 1
        return file_to_diff_lines

    def is_only_comment(self, f):
        file_to_diff_lines = self.get_pr_diff_lines()
        comment_lines = self.get_comment_of_file(f)
        diff_lines = file_to_diff_lines.get(f.replace(PADDLE_ROOT, '', 1))
        if not diff_lines:
            return False
        for l in diff_lines:
            if l not in comment_lines:
                return False
        print('PREC {} is only comment'.format(f))
        return True

    def get_pr_ut(self):
        """ Get unit tests in pull request. """
        if self.full_case:
            return ''
        check_added_ut = False
        ut_list = []
        file_ut_map = None
        ret = self.__wget_with_retry(
            'https://sys-p0.bj.bcebos.com/prec/file_ut.json{}'.format(
                self.suffix))
        if not ret:
            print('PREC download file_ut.json failed')
            exit(1)
        with open('file_ut.json' + self.suffix) as jsonfile:
            file_ut_map = json.load(jsonfile)
        for f in self.get_pr_files():
            if f not in file_ut_map:
                if f.endswith('.md'):
                    ut_list.append('md_placeholder')
                elif f.endswith('.h') or f.endswith('.cu'):
                    if self.is_only_comment(f):
                        ut_list.append('h_cu_comment_placeholder')
                    else:
                        print(
                            'PREC dismatch: {} not in file ut map and not md or comment'.
                            format(f))
                        return ''
                elif f.endswith('.cc') or f.endswith('.py') or f.endswith(
                        '.cu'):
                    if f.find('test_') != -1 or f.find('_test') != -1:
                        print('PREC {} need check new ut'.format(f))
                        check_added_ut = True
                    elif self.is_only_comment(f):
                        ut_list.append('nomap_comment_placeholder')
                    else:
                        print(
                            'PREC dismatch: {} not in file ut map and not new ut or comment'.
                            format(f))
                        return ''
                else:
                    print('PREC dismatch: {} not in file ut map'.format(f))
                    return ''
            else:
                if self.is_only_comment(f):
                    ut_list.append('map_comment_placeholder')
                else:
                    ut_list.extend(file_ut_map.get(f))
        ut_list = list(set(ut_list))

        if check_added_ut:
            with open('{}/added_ut'.format(PADDLE_ROOT)) as utfile:
                for ut in utfile:
                    print('PREC NEW UT: {}'.format(ut.rstrip('\r\n')))
                    ut_list.append(ut.rstrip('\r\n'))

        if ut_list:
            ret = self.__wget_with_retry(
                'https://sys-p0.bj.bcebos.com/prec/prec_delta{}'.format(
                    self.suffix))
            if ret:
                with open('prec_delta' + self.suffix) as delta:
                    for ut in delta:
                        ut_list.append(ut.rstrip('\r\n'))
            else:
                print('PREC download prec_delta failed')
                exit(1)

        return '\n'.join(ut_list)


if __name__ == '__main__':
    pr_checker = PRChecker()
    pr_checker.init()
    #print(pr_checker.get_pr_ut())
    with open('ut_list', 'w') as f:
        f.write(pr_checker.get_pr_ut())
