# IMPORTS
from flask import Flask, render_template, request
from werkzeug.utils import secure_filename
import os

# CONFIG
app = Flask(__name__, instance_relative_config=True)
app.config.from_object(os.environ['APP_SETTINGS'])


from tools import upload_file_to_s3

ALLOWED_EXTENSIONS = app.config["ALLOWED_EXTENSIONS"]


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


@app.route("/", methods=['GET', 'POST'])
def index():
    if request.method == 'POST':
        # There is no file selected to upload
        if "user_file" not in request.files:
            return "No user_file key in request.files"

        file = request.files["user_file"]

        # There is no file selected to upload
        if file.filename == "":
            return "Please select a file"

        # File is selected, upload to S3 and show S3 URL
        if file and allowed_file(file.filename):
            file.filename = secure_filename(file.filename)
            output = upload_file_to_s3(file, app.config["S3_BUCKET"])
            return str(output)
    else:
        return render_template("index.html")