import logging
import uuid
import tempfile
import os
from celery import Celery
from datetime import datetime, timedelta
from flask import Flask, abort, request, Response, send_file
from shutil import rmtree
import pypandoc

app = Flask(__name__)
app.logger.setLevel(logging.INFO)

# Celery setup and init
celery = Celery(app.import_name)
celery.conf.broker_url = 'redis://redis:6379/0'
celery.conf.worker_concurrency = 2
@celery.on_after_configure.connect
def setup_periodic_tasks(sender, **kwargs):
    app.logger.info('Cleanup periodic task setup')


@app.route('/')
def index():
    return 'Hello'


@app.route('/convert', methods=['POST'])
def convert():
    if 'input' not in request.files:
        abort(400)
    if 'outputs' not in request.form:
        abort(400)

    job_name = uuid.uuid4().hex
    job_dir = tempfile.mkdtemp(suffix='-' + job_name)
    later = datetime.utcnow() + timedelta(hours=1)
    clean_up.apply_async((job_dir, ), eta=later)

    input_file = request.files['input']
    input_base, input_ext = input_file.filename.rsplit('.')
    input_path = os.path.join(job_dir, 'input.' + input_ext)
    input_file.save(input_path)

    outputs = request.form['outputs'].split(',')
    results = []
    for output in outputs:
        output_filename = '{0}.{1}'.format(input_base, output)
        output_path = os.path.join(job_dir, output_filename)
        app.logger.info('Converting {0} to {1}'.format(input_path, output_path))
        pypandoc.convert(input_path, output, outputfile=output_path)
        results.append({
            'input': input_path,
            'output': output_path,
            'format': output,
        })
    if len(results) == 1:
        return send_file(results[0]['output'])
    return Response(str(results))


@celery.task()
def clean_up(path):
    app.logger.info('Deleting work dir %s', path)
    rmtree(path)