#!/usr/bin/python

# 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.

# Error Codes
# 1000: Failed check (default error)
# 1001: Check not existing but expected

import argparse
import logging
import requests
import json


class FailedPR:
    """Base class for failed Pull Requests"""

    def __init__(
        self,
        created_at,
        host,
        updated_at,
        url,
        error=None,
        pullrequest=None,
        org=None,
        repo=None,
        status=None,
        zuul_url=None):

        self.created_at = created_at
        self.error = error
        self.host = host
        self.org = org
        self.pullrequest = pullrequest
        self.repo = repo
        self.status = status
        self.updated_at = updated_at
        self.url = url
        self.zuul_url = zuul_url


def get_args():
    """
    Function to collect parameter.
    """
    parser = argparse.ArgumentParser(
        description='Bootstrap repositories.')
    parser.add_argument(
        '--gh-orgs',
        nargs='+',
        default=['opentelekomcloud-docs'],
        help='One or more GitHub organizations to be queried for failed Pull '
             'Requests.\n'
             'Default: [opentelekomcloud-docs]'
    )
    parser.add_argument(
        '--gitea-orgs',
        nargs='+',
        default=['docs'],
        help='One or more Gitea organizations to be queried for failed Pull '
             'Requests.\n'
             'Default: [docs]'
    )
    parser.add_argument(
        '--gh-token',
        help='API Token for GitHub.'
    )
    parser.add_argument(
        '--gitea-token',
        help='API Token for Gitea'
    )
    parser.add_argument(
        '--debug',
        action='store_true',
        help='Set debug mode on.'
    )
    parser.add_argument(
        '--gitea-url',
        default='https://gitea.eco.tsi-dev.otc-service.com/api/v1/',
        help='Gitea base URL for API request.\n'
             'Default: https://gitea.eco.tsi-dev.otc-service.com/api/v1/'
    )
    parser.add_argument(
        '--gh-url',
        default='https://api.github.com/',
        help='GitHub Base URL for API request.\n'
             'Default: https://api.github.com/'
    )
    parser.add_argument(
        '--hoster',
        default=['gitea', 'github'],
        nargs='+',
        help='Git hoster to be queried for failed Pull Requests.\n'
             'Default: [github, gitea].'
    )
    return parser.parse_args()


def get_gitea_repos(url, headers, gitea_org):
    """
    Get all Repositories of one Gitea orgainzation
    """
    repositories = []
    i = 1

    while True:
        try:
            req_url = (url
                       + 'orgs/'
                       + gitea_org
                       + '/repos?limit=50&page='
                       + str(i))
            res = requests.request('GET', url=req_url, headers=headers)
            i += 1
            if res.json():
                for repo in res.json():
                    repositories.append(repo)
                continue
            else:
                break
        except Exception as e:
            print("An error has occured: " + str(e))
            print("The request status is: " + str(res.status_code) +
            " | " + str(res.reason))
            break
    return repositories

def get_gitea_prs(url, headers, gitea_org, repo):
    """
    Collect all Pull Requests of a Gitea Repository
    """
    pullrequests = []

    try:
        req_url = (url + 'repos/' + gitea_org + '/'
                    + repo + '/pulls?state=open')
        res = requests.request('GET', url=req_url, headers=headers)
        if res.json():
            for pr in res.json():
                pullrequests.append(pr)
    except Exception as e:
        print("An error has occured: " + str(e))
        print("The request status is: " + str(res.status_code) +
                " | " + str(res.reason))
        exit()
    return pullrequests

def get_failed_gitea_commits(pull, url, gitea_org, repo, headers):
    """
    Collect all failed gitea commits of one repository.
    """
    failed_commits = []
    try:
        req_url = (url + 'repos/' + gitea_org + '/' + repo['name'] +
                    '/commits/' + pull['head']['ref'] + '/statuses?limit=1')
        res_sta = requests.request('GET', url=req_url, headers=headers)
        if res_sta.json():
            if res_sta.json()[0]['status'] == 'failure':
                o = FailedPR(
                    host='gitea',
                    url=pull['url'],
                    org=gitea_org,
                    repo=repo['name'],
                    pullrequest=pull['title'],
                    status=res_sta.json()[0]['status'],
                    zuul_url=res_sta.json()[0]['target_url'],
                    created_at=pull['created_at'],
                    updated_at=res_sta.json()[0]['updated_at'],
                    error=1000
                )
                failed_commits.append(o)

    except Exception as e:
        print("An error has occured: " + str(e))
        print("The request status is: " + str(res_sta.status_code) +
                " | " + str(res_sta.reason))
        print(json.dumps(res_sta.json()))
        exit()
    return failed_commits

def get_github_repos(url, headers, gh_org):
    """
    Get all repositories of one GitHub organization
    """
    repositories = []
    i = 1

    while True:
        try:
            req_url = url + 'orgs/' + gh_org + '/repos?page=' + str(i)
            res = requests.request('GET', url=req_url, headers=headers)
            if res.json():
                for repo in res.json():
                    repositories.append(repo)
                i+=1
                continue
            else:
                break
        except Exception as e:
            print("An error has occured: " + str(e))
            print("The request status is: " + str(res.status_code) +
                    " | " + str(res.reason))
            break
    return repositories

def get_github_prs(url, headers, gh_org, repo):
    """
    Get all Pull Requests of one GitHub repository
    """
    pullrequests = []
    i = 1

    while True:
        try:
            req_url = (url + 'repos/' + gh_org + '/' + repo +
                        '/pulls?state=open&page=' + str(i))
            res = requests.request('GET', url=req_url, headers=headers)
            if res.json():
                for pr in res.json():
                    pullrequests.append(pr)
                i+=1
                continue
            else:
                break
        except Exception as e:
            print("An error has occured: " + str(e))
            print("The request status is: " + str(res.status_code) +
                    " | " + str(res.reason))
            break
    return pullrequests


def get_failed_gh_commits(pull, url, gh_org, repo, headers):
    """
    Collect all Failed Pull Requests of one GitHub repository
    """
    failed_commits = []
    try:
        req_url = (url + 'repos/' + gh_org + '/' + repo['name'] +
                    '/commits/' + pull['head']['sha'] + '/check-runs')
        res_sta = requests.request('GET', url=req_url, headers=headers)
        if res_sta.json():
            if len(res_sta.json()['check_runs']) != 0:
                if res_sta.json()['check_runs'][0]['conclusion'] == 'failure':
                    o = FailedPR(
                        host='github',
                        url=pull['html_url'],
                        org=gh_org,
                        repo=repo['name'],
                        pullrequest=pull['title'],
                        status=res_sta.json()['check_runs'][0]['conclusion'],
                        zuul_url=(res_sta.json()['check_runs']
                                    [0]['details_url']),
                        created_at=pull['created_at'],
                        updated_at=(res_sta.json()['check_runs']
                                    [0]['completed_at']),
                        error=1000
                    )
                    failed_commits.append(o)
            else:
                o = FailedPR(
                    host='github',
                    url=pull['html_url'],
                    org=gh_org,
                    repo=repo['name'],
                    pullrequest=pull['title'],
                    created_at=pull['created_at'],
                    updated_at=pull['updated_at'],
                    error=1001,
                )
                failed_commits.append(o)

    except Exception as e:
        print("An error has occured: " + str(e))
        print("The request status is: " + str(res_sta.status_code) +
                " | " + str(res_sta.reason))
        print(json.dumps(res_sta.json()))
        exit()
    return failed_commits


def create_json_result(failed_commits):
    """
    Create Result
    """
    result = {}
    result['meta'] = {}
    result['data'] = []
    if len(failed_commits) != 0:
        failed_commits_json = []
        for o in failed_commits:
            failed_commits_json.append(vars(o))
        result['meta']['count'] = len(failed_commits_json)
        result['data'] = failed_commits_json
    else:
        result['meta']['count'] = 0

    return json.dumps(result)


def main():
    args = get_args()
    failed_commits = []

    if args.debug:
        logging.basicConfig(level=logging.DEBUG)

    for h in args.hoster:
        if h == 'gitea':

            headers = {}
            headers['accept'] = 'application/json'
            if not args.gitea_token:
                raise Exception('Please, provide Gitea Token as argument.')
            if not args.gitea_url:
                raise Exception('Please, provide Gitea URL as argument.')
            headers['Authorization'] = 'token ' + args.gitea_token

            for org in args.gitea_orgs:
                repos = get_gitea_repos(
                    url=args.gitea_url,
                    headers=headers,
                    gitea_org=org
                )
                for repo in repos:
                    pulls = get_gitea_prs(
                        url=args.gitea_url,
                        headers=headers,
                        gitea_org=org,
                        repo=repo['name']
                    )
                    if pulls:
                        for pull in pulls:
                            commits = get_failed_gitea_commits(
                                pull=pull,
                                url=args.gitea_url,
                                gitea_org=org,
                                repo=repo,
                                headers=headers
                            )
                            failed_commits.extend(commits)

        elif h == 'github':
            if not args.gh_url:
                raise ValueError('Parameter --gh-url not found.')
            url = args.gh_url
            headers = {}
            headers['accept'] = 'application/json'
            if not args.gh_token:
                raise Exception('Please, provide GitHub Token as argument.')
            headers['Authorization'] = 'Bearer ' + args.gh_token

            for org in args.gh_orgs:
                repos = get_github_repos(
                    url=url,
                    headers=headers,
                    gh_org=org
                )
                for repo in repos:
                    pulls = get_github_prs(
                        url=url,
                        headers=headers,
                        gh_org=org,
                        repo=repo['name']
                    )
                    if pulls:
                        for pull in pulls:
                            commits = get_failed_gh_commits(
                                pull=pull,
                                url=url,
                                gh_org=org,
                                repo=repo,
                                headers=headers
                            )
                            failed_commits.extend(commits)

    print(create_json_result(
        failed_commits=failed_commits))


if __name__ == '__main__':
    main()