from perceval.backends.core.git import Git
import os
import datetime as dt
import time
import shutil 
import pandas as pd
import dateutil
from tqdm import tqdm

key = os.environ.get('KKEXKEY')

early_cutoff = dt.datetime(2008,2, 8)
temp_dir = "/data/users/mgaughan/tmp"

'''
- what we really want is the 6 weeks before and after these events 
- lets start by getting 6 weeks (42 days) before and after the first appearance of a given document
- rate of change, rate of PRs/day
'''
def file_get_pr(upstream_vcs_link):
    #this is the window of days on either side of the event that we're looking at
    window = 42
    #print(upstream_vcs_link.split('/')[4])
    project_dict = {}
    project_dict['upstream_vcs_link'] = upstream_vcs_link
    full_temp_path = temp_dir + upstream_vcs_link.split('/')[4] + ".git"
    repo = Git(uri=upstream_vcs_link, gitpath=full_temp_path)
    try:
        commits = repo.fetch()
    except:
        print("perceval issue")
        return
    has_readme = False
    has_contributing = False
    merge_pre_rm, merge_post_rm, merge_pre_cont, merge_post_cont = 0, 0, 0, 0
    #list of tuples which has date and whether it was a merge
    commit_list = []
    for commit in commits:
        if "Merge" in commit['data'].keys():
            commit_list.append([commit['data']['CommitDate'], True])
            if has_contributing:
                merge_post_cont += 1
            else:
                merge_pre_cont += 1
        else: 
            commit_list.append([commit['data']['CommitDate'], False])
        files = commit['data']['files']
        #print(commit['data']['CommitDate'])
        #print(type(dateutil.parser.parse(commit['data']['CommitDate'])))
        for file in files:
            if "CONTRIBUTING.md" == file['file'] and has_contributing == False:
                has_contributing = True
                first_date_contributing = dateutil.parser.parse(commit['data']['CommitDate'])
            if "README.md" == file['file'] and has_readme == False:
                has_readme = True
                first_date_readme = dateutil.parser.parse(commit['data']['CommitDate'])
    shutil.rmtree(full_temp_path, ignore_errors=True)
    project_dict['first_contributing'] = first_date_contributing
    project_dict['first_readme'] = first_date_readme
    before_cont = pr_count(first_date_contributing + dt.timedelta(days=-window, hours=0), first_date_contributing, commit_list)
    project_dict['b6w_prs_cont'] = before_cont[0]
    project_dict['b6w_mrg_cont'] = before_cont[1]
    after_cont = pr_count(first_date_contributing, first_date_contributing + dt.timedelta(days=window, hours=0), commit_list)
    project_dict['a6w_prs_cont'] = after_cont[0]
    project_dict['a6w_mrg_cont'] = after_cont[1]
    before_read = pr_count(first_date_readme+ dt.timedelta(days=-window, hours=0), first_date_readme, commit_list)
    project_dict['b6w_prs_read'] = before_read[0]
    project_dict['b6w_mrg_read'] = before_read[1]
    after_read = pr_count(first_date_readme, first_date_readme + dt.timedelta(days=window, hours=0), commit_list)
    project_dict['a6w_prs_read'] = after_read[0]
    project_dict['a6w_mrg_read'] = after_read[1]
    print(project_dict)
    return project_dict

def pr_count(start, end, commits):
    count = 0
    merge_count = 0
    for commit in tqdm(commits):
        if dateutil.parser.parse(commit[0]) > start:
            count += 1
            if commit[1]:
                merge_count += 1
        if dateutil.parser.parse(commit[0]) > end:
            return [count, merge_count]



if __name__ == "__main__":
    file_get_pr("https://github.com/tqdm/tqdm")
    file_get_pr("https://github.com/GameServerManagers/LinuxGSM")