import json
import requests

import config_parser

# as per https://docs.gitlab.com/ee/api/rest/index.html#offset-based-pagination
MAX_NUMBER_OF_ITEMS_PER_PAGE = 100


def write_to_file(response_array):
    f = open("output/gitlab-jobs1.txt", "a")
    f.write(str(response_array))
    f.close()


def find_jobs_by_name_that_were_run(list_of_jobs, job_name):
    name_filter = filter(lambda x: x['name'] == job_name and x['status'] == 'success', list_of_jobs)
    filtered_list_of_jobs = list(name_filter)

    print(filtered_list_of_jobs)
    return filtered_list_of_jobs


def calc_number_of_pages_number(total_number):
    if total_number <= MAX_NUMBER_OF_ITEMS_PER_PAGE:
        return total_number, 1
    else:
        return MAX_NUMBER_OF_ITEMS_PER_PAGE, round(total_number / MAX_NUMBER_OF_ITEMS_PER_PAGE)


def filter_relevant_attributes(job):
    relevant_job = {
        'status': job['status'],
        'name': job['name'],
        'ref': job['ref'],
        'started_at': job['started_at'],
        'commit_id': job['commit']['id']
    }
    return relevant_job


def find_jobs(count, project_id, job_name):
    number_of_items_per_page, number_of_pages = calc_number_of_pages_number(count)

    url_template = 'https://gitlab.atb-bremen.de/api/v4/projects/{}/jobs?per_page={}&page={}'

    # get the last 100x50 jobs = 5000
    iterations = list(range(0, number_of_pages))

    response_array = []

    headers = {
        'PRIVATE-TOKEN': config_parser.token
    }

    print("getting {} jobs from project {}...".format(count, project_id))
    for i in iterations:
        response = requests.request("GET", url_template.format(project_id, number_of_items_per_page, i), headers=headers)
        json_response = response.text
        response_array.append(json.loads(json_response))

    import itertools

    flat_list_of_jobs = list(itertools.chain(*response_array))
    list_of_successfull_jobs = find_jobs_by_name_that_were_run(flat_list_of_jobs, job_name)

    # filter output for relevant fields
    return list(map(filter_relevant_attributes, list_of_successfull_jobs))