import os
from pathlib import Path
from configparser import ConfigParser

GITEA_REPOS = ['boxtools']

GITEA_URL = 'https://gitea.psi.ch/linse/%s.git'

GET_GITEA_TOKEN = """#!/bin/bash
if [ -z "$GITEA_TOKEN" ]; then
  echo "" 1>&2
  echo "you try to push without setting GITEA_TOKEN" 1>&2
  echo "please use 'setuser <initials>' to identify yourself" 1>&2
  echo "" 1>&2
  echo quit=1
else
  if [ "$1" == "get" ]; then
    echo "connecting with gitea token for $GIT_AUTHOR_NAME" 1>&2
  fi
  echo username=_
  echo "password=$GITEA_TOKEN"
fi
"""

PRE_COMMIT_HOOK = """#!/bin/bash
if [ "$GIT_AUTHOR_NAME" == "PREVENT_DEFAULT" ]; then
   echo ''
   echo 'You tried to commit without specified author'
   echo "please execute 'setuser <initials>' to identify yourself"
   echo 'or add the author with:  git commit --author=<your name>'
   echo ''
   exit 1
else
   echo "Author: $GIT_AUTHOR_NAME<$GIT_AUTHOR_EMAIL>"
fi
"""


def write_when_new(doit, filename, content):
    if content is None:
        lines = []
    else:
        if not content.endswith('\n'):
            content += '\n'
        lines = content.split('\n')
    try:
        with open(filename) as fil:
            old = fil.read()
    except FileNotFoundError:
        old = None
    if old == content:
        return False
    if doit:
        if lines:
            with open(filename, 'w') as fil:
                fil.write(content)
        else:
            os.remove(filename)
        return True
    elif old:
        print(filename, 'needs an update')
    else:
        print(filename, 'is missing')


def change_to_gitea(doit, *repos):
    dirty = False
    cwd = os.getcwd()
    try:
        for repo in repos:
            os.chdir(Path('~').expanduser() / repo)
            try:
                parser = ConfigParser()
                parser.read('.git/config')
            except FileNotFoundError:
                continue
            if write_when_new(doit, '.git/hooks/get_gitea_token', GET_GITEA_TOKEN):
                dirty = True
            if write_when_new(doit, '.git/hooks/pre-commit', PRE_COMMIT_HOOK):
                dirty = True
            if doit:
                dothis = False
                try:
                    if parser.get('credential', 'helper') != str(gitdir / hooks / 'get_gitea_token'):
                        dothis = True
                        print('need to change gitea credential helper')
                except Exception:
                    dothis = True
                    print('missing gitea credential helper')
                try:
                    if parser.get('remote "origin"', 'url') != GITEA_URL % repo:
                        dothis = True
                        print('need to change remote url')
                except Exception:
                    dothis = True
                    print('missing remote url')
                if dothis:
                    dirty = True
                    os.system(f'git config credential.helper "{os.getcwd()}/.git/hooks/get_gitea_token"')
                    os.system(f'git remote set-url origin {GITEA_URL}')
    finally:
        os.chdir(cwd)
    return dirty


change_to_gitea(False, *GITEA_REPOS)