import json
import os

from flask import Flask, render_template


def create_app():
    # create and configure the app
    app = Flask(__name__, instance_relative_config=True)
    app.config.from_mapping(
        SECRET_KEY = 'dev',
        DATABASE = os.path.join(app.instance_path, 'video_metadata.sqlite'),
        MOVIE_DIR = os.path.join(app.instance_path, 'movie_dir'),
        TMDB_API_KEY = parse_API_key(app, os.path.join(app.instance_path, 'API_KEY.json')),
    )

    # ensure the instance folder exists
    try:
        os.makedirs(app.instance_path)
    except OSError:
        pass

    from . import db
    db.init_app(app)

    from video_metadata.views import file_listing
    app.register_blueprint(file_listing.bp)

    from video_metadata.views import tmdb
    app.register_blueprint(tmdb.bp)

    app.add_url_rule('/', 'index', index)

    return app


def index():
    return render_template('index.html')

def parse_API_key(app, path):
    try:
        fd = open(path)
    except OSError as e:
        app.logger.error('error opening path: %s, %s', path, e.strerror)
        return ''

    j = json.load(fd)
    fd.close()

    return j['key']