#!/usr/bin/env -S nix shell --impure --expr "(import (builtins.getFlake \"nixpkgs\") {}).python3.withPackages (ps: [ ps.python-gitlab ps.GitPython ])" --command python

import json
import os
import pathlib

import git
import gitlab

TOKEN_NAME = os.environ['GITLAB_ACCESS_TOKEN_NAME']
TOKEN = os.environ['GITLAB_ACCESS_TOKEN']
REPO_FOLDER = 'drive'

def get_repo():
    if os.path.exists(REPO_FOLDER):
        print('Repo already exists')
        repo = git.Repo(REPO_FOLDER)
    else:
        print('Cloning repo')
        repo = git.Repo.clone_from(f'https://{TOKEN_NAME}:{TOKEN}@git.zeus.gent/bestuur/drive.git', REPO_FOLDER)
        with repo.config_writer() as cw:
            cw.set_value('user', 'email', 'codimd.zeus.gent@mcbloch.dev')
            cw.set_value('user', 'name', 'CodiMD sync bot')
    repo.remotes.origin.fetch()
    return repo

def clear_repo(repo):
    repo.git.restore('--staged', '--', '*')
    repo.git.restore('--', '*')

def checkout_branch(repo, branch_name):
    repo.git.switch('master')
    if branch_name in repo.heads:
        repo.git.switch(branch_name)
    else:
        repo.git.switch('-c', branch_name)
    if branch_name in repo.remotes.origin.refs:
        repo.heads[branch_name].set_tracking_branch(repo.remotes.origin.refs[branch_name])
        repo.remotes.origin.pull()

def sync_file(drive, repo, note, sync_to):
    branch_name = f'codimd-sync_{sync_to}'
    print(f'Starting sync of {note}')
    clear_repo(repo)
    checkout_branch(repo, branch_name)
    with open(f'data/{note}') as r:
        pathlib.Path(f'{REPO_FOLDER}/{sync_to[:sync_to.rfind("/")]}').mkdir(parents=True, exist_ok=True)
        with open(f'{REPO_FOLDER}/{sync_to}', 'w') as w:
            w.write(r.read())
    if repo.index.diff() or repo.untracked_files:
        repo.git.add(sync_to)
        repo.git.commit('-m', sync_to)
        repo.git.push('-u', 'origin', branch_name)
        if not drive.mergerequests.list(source_branch=branch_name, state='opened'):
            if drive.mergerequests.list(source_branch=branch_name):
                drive.mergerequests.create({"source_branch": branch_name, "target_branch": 'master', "title": f'[CodiMD sync] Update document {sync_to}'})
            else:
                drive.mergerequests.create({"source_branch": branch_name, "target_branch": 'master', "title": f'[CodiMD sync] Add document {sync_to}'})

if __name__ == '__main__':
    repo = get_repo()
    gl = gitlab.Gitlab('https://git.zeus.gent', private_token=TOKEN)
    drive = gl.projects.get(2)
    with open('files.json') as f:
        files = json.load(f)["valid_files"]
    for path in files:
        sync_file(drive, repo, path, files[path]["sync-to"])