import datetime
import os
import subprocess
##
import git
from flask import render_template, make_response, request, Response
##
from app import app


repo_path = '/srv/python/aif_ng'
repo_uri = '/opt/git/repositories/aif-ng.git'
branch = 'v2_rewrite'
update_hours = 1

if not os.path.isdir(repo_path):
    repo = git.Repo.clone_from(repo_uri, repo_path)
else:
    repo = git.Repo(repo_path)


def chkbranch(ref_param = None):
    oldhead = repo.head.ref
    if not ref_param:
        ref = branch
    else:
        ref = ref_param

    if not ref_param:
        if repo.active_branch.name != branch:
            repo.git.checkout(branch)
    else:
        repo.git.checkout(ref)
    lastcommit = repo.head.commit.authored_datetime
    now = datetime.datetime.now(datetime.timezone.utc)
    if (now - lastcommit) > datetime.timedelta(hours = update_hours):
        print('Fetching update. Current HEAD: {0}'.format(repo.head.commit.hexsha))
        repo.remotes.origin.fetch()
    return(oldhead)


@app.route('/', methods = ['GET'])
def index():
    oldref = chkbranch(ref_param = request.args.get('ref'))
    docsdir = os.path.join(repo_path, 'docs')
    # TODO: is this in the right place? it used to be after the subprocess call.
    oldref.checkout()
    for fname in ('MANUAL', 'README'):
        fpath = os.path.join(docsdir, '{0}.adoc'.format(fname))
        if os.path.isfile(fpath):
            docspath = fpath
            break
    cmd = subprocess.run(['asciidoctor',
                          docspath,
                          '-o', '-'],
                         stdout = subprocess.PIPE)
    return(cmd.stdout.decode('utf-8'))


@app.route('/aif.xsd', methods = ['GET'])
def xsd():
    oldref = chkbranch(ref_param = request.args.get('ref'))
    # TODO: is this in the right place? it used to be after the resp.headers i think.
    oldref.checkout()
    with open(os.path.join(repo_path, 'aif.xsd'), 'r') as fh:
        xsd_raw = fh.read()
    resp = Response(xsd_raw)
    resp.headers['content-type'] = 'text/xml'
    return(resp)