import csv
import os
import tomllib

import flask_apscheduler
from application.csvparser import CsvParser
from flask import Flask
from flask_bcrypt import Bcrypt
from flask_login import LoginManager
from flask_migrate import Migrate
from flask_sqlalchemy import SQLAlchemy
from flask_wtf.csrf import CSRFProtect
from whoosh.fields import *
from whoosh.index import create_in
from whoosh.qparser import QueryParser

db = SQLAlchemy()
migrate = Migrate()
bcrypt = Bcrypt()
login_manager = LoginManager()

SCRIPT_DIR = os.path.dirname(__file__)
DATA_DIR = os.path.abspath(os.path.join(SCRIPT_DIR, "data"))


def create_app():
    settings = settings_from_file()

    APP = Flask(__name__, static_folder="static")
    APP.config["SECRET_KEY"] = os.urandom(24)
    APP.config["UPLOAD_FOLDER"] = "tmpupload"
    APP.config["IMAGE_FOLDER"] = "static/images"

    APP.config["SQLALCHEMY_DATABASE_URI"] = "sqlite:///libraryusers.db"
    APP.config["SQLALCHEMY_TRACK_MODIFICATIONS"] = True

    APP.config["LIBRARY_FILENAME"] = settings["libaryfilename"]
    APP.config["TITLE"] = settings["title"]

    csrf = CSRFProtect(APP)
    csrf.init_app(APP)
    login_manager.init_app(APP)
    db.init_app(APP)
    migrate.init_app(APP, db, render_as_batch=True)
    bcrypt.init_app(APP)

    scheduler = flask_apscheduler.APScheduler()
    scheduler.api_enabled = False
    scheduler.init_app(APP)
    scheduler.start()
    index_books(APP.config["LIBRARY_FILENAME"], APP.config["IMAGE_FOLDER"])

    @scheduler.task("interval", id="update", minutes=10)
    def update():
        index_books(APP.config["LIBRARY_FILENAME"], APP.config["IMAGE_FOLDER"])

    @APP.context_processor
    def inject_title():
        return dict(title=APP.config["TITLE"])

    return APP


def get_app():
    APP = Flask(__name__, static_folder="static")
    return APP


def index_books(filename: str, image_folder: str):
    csvparser = CsvParser(filename, image_folder)
    filename = os.path.join(DATA_DIR, csvparser.csv_file)
    schema = Schema(
        title=TEXT(stored=True), path=ID(stored=True), content=TEXT
    )
    ix = create_in(DATA_DIR, schema)
    writer = ix.writer()
    with open(filename, "r", encoding="utf_8_sig") as libcsv:
        csv_as_dict = csv.DictReader(libcsv)
        for row in csv_as_dict:
            rowcontent = csvparser.concatenate_csv_row(row)
            writer.add_document(title=row["Id"], path="/a", content=rowcontent)
    writer.commit()


def settings_from_file():
    settings = {}
    if os.path.isfile("settings_development.toml"):
        with open("settings_development.toml", "rb") as settings_file:
            return tomllib.load(settings_file)
    with open("settings.toml", "rb") as settings_file:
        return tomllib.load(settings_file)