import os

from flask import (
    Blueprint, render_template,
    flash, request, url_for, redirect, abort, send_from_directory, current_app)
from werkzeug.utils import secure_filename

from calender.auth import login_required
from calender.db import get_db

bp = Blueprint('calender', __name__)
ALLOWED_EXTENSIONS = {'png', 'jpg', 'jpeg', 'gif', 'webm', 'mp4', 'bmp'}


# Todo admin interface for managing submit, comments, submission date

@bp.route('/')
def index():
    db = get_db()
    posts = db.execute(
        'SELECT p.id, title, body, created,  nickname, file, chosen, type'
        ' FROM post p'
        ' ORDER BY created DESC'
    ).fetchall()
    # noinspection PyUnresolvedReferences
    return render_template('calender/index.html', posts=posts)


@bp.route('/admin')
@login_required
def admin():
    db = get_db()
    posts = db.execute(
        'SELECT p.id, title, body, created, nickname, file, chosen, type'
        ' FROM post p'
        ' ORDER BY created DESC'
    ).fetchall()
    # noinspection PyUnresolvedReferences
    return render_template('calender/admin.html', posts=posts)


@bp.route('/create', methods=('GET', 'POST'))
# @login_required
def create():
    if request.method == 'POST':
        title = request.form['title']
        nickname = request.form['nickname']
        body = request.form['body']
        # check if the post request has the file part
        if 'file' not in request.files:
            flash('No file part')
            return redirect(request.url)
        file = request.files['file']
        # if user does not select file, browser also
        # submit an empty part without filename
        if file.filename == '':
            flash('No selected file')
            return redirect(request.url)

        error = None

        if not title:
            error = 'Title is required.'

        if error is not None:
            flash(error)
        else:
            if file and allowed_file(file.filename):
                file_type = check_file_type(file.filename)
                filename = secure_filename(file.filename)
                file.save(os.path.join(current_app.config['UPLOAD_FOLDER'], filename))

                db = get_db()
                db.execute(
                    'INSERT INTO post (title, body, nickname, file, chosen, type)'
                    ' VALUES (?, ?, ?, ?, ?, ?)',
                    (title, body, nickname, url_for('calender.uploaded_file',
                                                    filename=filename), False, file_type)
                )
                db.commit()
                # return redirect(url_for('calender.uploaded_file',filename=filename))
            return redirect(url_for('calender.index'))

    return render_template('calender/create.html')


def get_post(id, check_author=True):
    post = get_db().execute(
        'SELECT p.id, title, body, created, nickname, file, chosen, type'
        ' FROM post p'
        ' WHERE p.id = ?',
        (id,)
    ).fetchone()

    if post is None:
        abort(404, "Post id {0} doesn't exist.".format(id))

    # if check_author and post['author_id'] != g.user['id']:
    # abort(403)

    return post


@bp.route('/<int:id>/update', methods=('GET', 'POST'))
@login_required
def update(id):
    post = get_post(id)

    if request.method == 'POST':
        title = request.form['title']
        nickname = request.form['nickname']
        body = request.form['body']
        if request.form.get('chosen') is None:
            chosen = 0
        else:
            chosen = 1
        error = None

        if not title:
            error = 'Title is required.'

        if error is not None:
            flash(error)
        else:
            db = get_db()
            db.execute(
                'UPDATE post SET title = ?, body = ?, nickname = ?, chosen = ?'
                ' WHERE id = ?',
                (title, body, nickname, chosen, id)
            )
            db.commit()
            return redirect(url_for('calender.index'))

    return render_template('calender/update.html', post=post)


@bp.route('/<int:id>/delete', methods=('POST',))
@login_required
def delete(id):
    get_post(id)
    db = get_db()
    db.execute('DELETE FROM post WHERE id = ?', (id,))
    db.commit()
    return redirect(url_for('calender.index'))


def allowed_file(filename):
    return '.' in filename and \
           filename.rsplit('.', 1)[1].lower() in ALLOWED_EXTENSIONS


def check_file_type(filename):
    if filename.rsplit('.', 1)[1].lower() in ['webm', 'mp4']:
        return 'video'
    else:
        return 'image'


@bp.route('/uploads/<filename>')
def uploaded_file(filename):
    return send_from_directory(current_app.config['UPLOAD_FOLDER'],
                               filename)