from flask import Flask, render_template, Blueprint, request, redirect, url_for, current_app
from datetime import timezone
import json
import os

clbp = Blueprint('todolist', __name__)


def save_todolist(list_items):  # Save todolist items
    new_list = json.dumps(list_items, indent=4)
    list_file = os.path.join(current_app.instance_path, 'list.py')
    try:
        with open(list_file, 'w') as f:
            f.write(f'LIST = {new_list}')
        f.close
        current_app.config.from_pyfile('list.py', silent=True)  # Reread the list into the app
    except Exception as sclerror:
        current_app.logger.error(f'Couldn\'t save list.py: {sclerror.args[0]}')


@clbp.route('/', methods=['GET', 'POST'])
def index():
    todolist_items = current_app.config['LIST']
    if request.method == 'POST':
        todolist_items = current_app.config['LIST']
        item = request.form.get('item')
        if item:
            todolist_items.append({'name': item, 'crossed': 'no'})
            save_todolist(todolist_items)  # Save to file after adding
        return redirect(url_for('todolist.index'))
    return render_template('index.html', items=todolist_items)


@clbp.route('/cross/<int:item_id>')
def cross(item_id):
    todolist_items = current_app.config['LIST']
    if 0 <= item_id < len(todolist_items):
        todolist_items[item_id]['crossed'] = 'yes'
        save_todolist(todolist_items)  # Save to file after crossing
    return redirect(url_for('todolist.index'))


@clbp.route('/uncross/<int:item_id>')
def uncross(item_id):
    todolist_items = current_app.config['LIST']
    if 0 <= item_id < len(todolist_items):
        todolist_items[item_id]['crossed'] = 'no'
        save_todolist(todolist_items)  # Save to file after crossing
    return redirect(url_for('todolist.index'))


@clbp.route('/clear')
def clear():
    todolist_items = current_app.config['LIST']
    todolist_items = []  # Clear the list
    save_todolist(todolist_items)  # Save the empty list
    return redirect(url_for('todolist.index'))


@clbp.route('/list')
def list():
    todolist_items = current_app.config['LIST']
    return render_template('list.html', items=todolist_items)