import datetime
import os.path
import uuid

from flask import Blueprint, request

import database
from constants import APKS_PATH

application_blueprint = Blueprint('application', __name__)


@application_blueprint.before_request
def auth():
    API_KEY = 'AF9A20DD9264C134CDA0ADACED834368'
    if request.headers.get('Authorization') != API_KEY:
        return {'error': 'Unauthorized'}, 401


@application_blueprint.get('<string:application_name>/download/<string:version>')
def download_version(application_name: str, version: str):
    application = database.Application.query.filter_by(version=version,
                                                       name=application_name).first()
    if not application:
        return {
            "error": f"Application version '{version}' not found."
        }, 404


@application_blueprint.get('<string:application_name>/version')
def get_version(application_name: str):
    version = (database.Application.query.
               filter_by(name=application_name).
               order_by(database.Application.uploaded.desc()).
               with_entities(database.Application.version).
               limit(1).
               scalar())
    return {'latest_version': version}


@application_blueprint.post('<string:application_name>/upload')
def upload(application_name: str):
    file = request.files.get('file')
    version = request.form.get('version')
    if (not file) or (not version):
        return {"error": "Invalid form data. There is no file or version field"}, 400
    version = version.strip()
    application = (database.Application.query.
                   filter_by(version=version).
                   with_entities(database.Application.id).first())
    if application:
        return {"error": f"Specified version ({version}) already uploaded"}, 400
    filename = uuid.uuid4().hex + '.apk'
    file.save(os.path.join(APKS_PATH, filename))
    application = database.Application(name=application_name,
                                       version=version,
                                       uploaded=datetime.datetime.now(),
                                       filename=filename)
    database.db.session.add(application)
    database.db.session.commit()
    return {'filename': filename, 'version': version}