from app.utils import background_delete_job, background_delete_corpus
from flask import (abort, current_app, flash, redirect, request,
                   render_template, url_for, send_from_directory)
from flask_login import current_user, login_required
from . import main
from .forms import AddCorpusFileForm, CreateCorpusForm, QueryForm
from .. import db
from ..models import Corpus, CorpusFile, Job, JobInput, JobResult
from werkzeug.utils import secure_filename
import os
import threading
import logging


@main.route('/')
def index():
    return render_template('main/index.html.j2', title='Opaque')


@main.route('/corpora/<int:corpus_id>')
@login_required
def corpus(corpus_id):
    corpus = Corpus.query.get_or_404(corpus_id)
    if not (corpus.creator == current_user
            or current_user.is_administrator()):
        abort(403)
    add_corpus_file_form = AddCorpusFileForm()
    if add_corpus_file_form.validate_on_submit():
        flash('Corpus file added!')
        return redirect(url_for('main.corpus', corpus_id=corpus_id))
    return render_template('main/corpora/corpus.html.j2',
                           add_corpus_file_form=add_corpus_file_form,
                           corpus=corpus,
                           title='Corpus')


@main.route('/corpora/<int:corpus_id>/download')
@login_required
def corpus_download(corpus_id):
    corpus_file_id = request.args.get('corpus_file_id')
    corpus_file = CorpusFile.query.get_or_404(corpus_file_id)
    if not corpus_file.corpus_id == corpus_id:
        abort(404)
    if not (corpus_file.corpus.creator == current_user
            or current_user.is_administrator()):
        abort(403)
    dir = os.path.join(current_app.config['OPAQUE_STORAGE_DIRECTORY'],
                       corpus_file.dir)
    return send_from_directory(as_attachment=True,
                               directory=dir,
                               filename=corpus_file.filename)


@main.route('/corpora/<int:corpus_id>/analysis', methods=['GET', 'POST'])
@login_required
def corpus_analysis(corpus_id):
    corpus = Corpus.query.get_or_404(corpus_id)
    form = QueryForm()
    if form.validate_on_submit():
        logger = logging.getLogger(__name__)
        logger.warning('Data has been sent!')
        flash('Query has been sent!')
        return redirect(url_for('main.corpus_analysis', corpus_id=corpus_id))
    return render_template('main/corpora/corpus_analysis.html.j2',
                           corpus=corpus,
                           form=form,
                           title='Corpus: ' + corpus.title)


@main.route('/dashboard', methods=['GET', 'POST'])
@login_required
def dashboard():
    create_corpus_form = CreateCorpusForm()
    if create_corpus_form.validate_on_submit():
        corpus = Corpus(creator=current_user._get_current_object(),
                        description=create_corpus_form.description.data,
                        title=create_corpus_form.title.data)
        db.session.add(corpus)
        db.session.commit()
        dir = os.path.join(current_app.config['OPAQUE_STORAGE_DIRECTORY'],
                           str(corpus.user_id),
                           'corpora',
                           str(corpus.id))
        try:
            os.makedirs(dir)
        except OSError:
            flash('OSError!')
        else:
            for file in create_corpus_form.files.data:
                filename = secure_filename(file.filename)
                file.save(os.path.join(dir, filename))
                file_dir = os.path.join(str(corpus.user_id),
                                        'corpora',
                                        str(corpus.id))
                corpus_file = CorpusFile(filename=filename,
                                         corpus_id=corpus.id,
                                         dir=file_dir)
                db.session.add(corpus_file)
            db.session.commit()
            flash('Corpus created!')
        return redirect(url_for('main.dashboard'))
    return render_template('main/dashboard.html.j2',
                           create_corpus_form=create_corpus_form,
                           title='Dashboard')


@main.route('/jobs/<int:job_id>')
@login_required
def job(job_id):
    job = Job.query.get_or_404(job_id)
    if not (job.creator == current_user or current_user.is_administrator()):
        abort(403)
    return render_template('main/jobs/job.html.j2', job=job, title='Job')


@main.route('/jobs/<int:job_id>/download')
@login_required
def job_download(job_id):
    ressource_id = request.args.get('ressource_id')
    ressource_type = request.args.get('ressource_type')
    if ressource_type == 'input':
        ressource = JobInput.query.get_or_404(ressource_id)
    elif ressource_type == 'result':
        ressource = JobResult.query.get_or_404(ressource_id)
    else:
        abort(400)
    if not ressource.job_id == job_id:
        abort(404)
    if not (ressource.job.creator == current_user
            or current_user.is_administrator()):
        abort(403)
    dir = os.path.join(current_app.config['OPAQUE_STORAGE_DIRECTORY'],
                       ressource.dir)
    return send_from_directory(as_attachment=True,
                               directory=dir,
                               filename=ressource.filename)


@main.route('/jobs/<int:job_id>/delete')
@login_required
def delete_job(job_id):
    delete_thread = threading.Thread(
        target=background_delete_job,
        args=(current_app._get_current_object(), job_id)
    )
    delete_thread.start()
    flash('Job has been deleted!')
    return redirect(url_for('main.dashboard'))


@main.route('/corpora/<int:corpus_id>/delete')
@login_required
def delete_corpus(corpus_id):
    delete_thread = threading.Thread(
        target=background_delete_corpus,
        args=(current_app._get_current_object(), corpus_id)
    )
    delete_thread.start()
    flash('Corpus has been deleted!')
    return redirect(url_for('main.dashboard'))