from flask import (abort, flash, make_response, render_template, request,
                   url_for)
from flask_login import current_user, login_required
from werkzeug.utils import secure_filename
from . import services
from . import SERVICES
from .. import db, socketio
from .forms import AddJobForms
from ..models import Job, JobInput
import json
import logging
import os


@services.route('/corpus-analysis')
@login_required
def corpus_analysis():
    return render_template('services/corpus_analysis.html.j2')


@services.route('/<service>', methods=['GET', 'POST'])
@login_required
def service(service):
    # Check if the requested service exist
    if service not in SERVICES or service not in AddJobForms:
        abort(404)
    version = request.args.get('version',
                               SERVICES[service]['versions']['latest'])
    if version not in SERVICES[service]['versions']:
        abort(404)
    form = AddJobForms[service](prefix='add-job-form', version=version)
    form.version.data = version
    title = SERVICES[service]['name']
    versions = SERVICES[service]['versions']
    if form.is_submitted():
        if not form.validate():
            return make_response(form.errors, 400)
        service_args = []
        if service == 'nlp':
            service_args.append('-l {}'.format(form.language.data))
            if form.check_encoding.data:
                service_args.append('--check-encoding')
        if service == 'ocr':
            service_args.append('-l {}'.format(form.language.data))
            if form.binarization.data:
                service_args.append('--binarize')
        job = Job(creator=current_user,
                  description=form.description.data,
                  service=service, service_args=json.dumps(service_args),
                  service_version=form.version.data,
                  status='preparing', title=form.title.data)
        db.session.add(job)
        db.session.flush()
        db.session.refresh(job)
        try:
            os.makedirs(job.path)
        except OSError:
            logging.error('Make dir {} led to an OSError!'.format(job.path))
            db.session.rollback()
            flash('Internal Server Error', 'error')
            return make_response(
                {'redirect_url': url_for('.service', service=service)}, 500)
        else:
            for file in form.files.data:
                filename = secure_filename(file.filename)
                job_input = JobInput(filename=filename, job=job)
                file.save(job_input.path)
                db.session.add(job_input)
            job.status = 'submitted'
            db.session.commit()
            flash('Job "{}" added'.format(job.title), 'job')
            event = 'user_{}_patch'.format(job.user_id)
            jsonpatch = [{'op': 'add', 'path': '/jobs/{}'.format(job.id), 'value': job.to_dict()}]  # noqa
            room = 'user_{}'.format(job.user_id)
            socketio.emit(event, jsonpatch, room=room)
            return make_response(
                {'redirect_url': url_for('jobs.job', job_id=job.id)}, 201)
    return render_template('services/{}.html.j2'.format(service.replace('-', '_')),
                           form=form, title=title, versions=versions)