from pygrocy import Grocy
from pygrocy.data_models.generic import EntityType
from flask import Flask, render_template, request, redirect
from datetime import datetime
from werkzeug.middleware.proxy_fix import ProxyFix

from pprint import pprint

#Global variables
DEFAULT_AMOUNT = 1
CASHBOX_USERID = 3

error_messages = {
    'item_not_found': 'Tenhle produkt nemůžeme najít ve skladu. Zkus to prosím znovu a pokud to nepůjde, řekni někomu z Trhliny.',
    'item_not_available': 'Podle kompjůtru ne! Náš systém říká že tuhle věc nemáme na skladu. Asi chyba u nás...',
    'user_not_found': 'Tenhle účet neexistuje nebo nemá povolený kredit. Můžeš věc naskenovat znovu a hodit prachy do kasičky',
}



g = Grocy("http://localhost", "BZzLkorATL66hSbKwIERoesALcIqNUPW91zONNNTHP0r9N6vk2", port=8080)


# Write money movement into the ledger (transaction log in Grocy).
def write_ledger(prod, userid, transaction_type, end_balance):
    entity_id = { "userentity_id": 1 }
    record_id = g.add_generic(EntityType.USER_OBJECTS, entity_id)['created_object_id']

    account = userid
    amount = prod['price']
    balance = end_balance
    item = prod['id']
    time_grocy = g.get_system_time().time_local
    time = time_grocy.strftime("%Y-%m-%d, %H:%M:%S")

    g.set_userfields('userentity-accounting', record_id, 'account', account)
    g.set_userfields('userentity-accounting', record_id, 'amount', amount)
    g.set_userfields('userentity-accounting', record_id, 'balance', balance)
    g.set_userfields('userentity-accounting', record_id, 'item', item)
    g.set_userfields('userentity-accounting', record_id, 'type', transaction_type)
    g.set_userfields('userentity-accounting', record_id, 'datetime', time)



# Subtract the price from user account or add it to the cashier. Also write it to ledger.
def prod_bill_user(prod, user):
    start_balance = user['balance']
    end_balance = start_balance - prod['price']
    g.set_userfields('users', user['id'], 'balance', end_balance)
    write_ledger(prod, user['id'], 'bar-bill-user', end_balance)
    return(end_balance)

# Add money paid for the product to the cashbox. 
def prod_bill_cash(prod):
    for user in g.users():
        if user.id == CASHBOX_USERID:
            cashbox = user
            break

    start_balance = float(g.get_userfields('users', cashbox.id)['balance'])
    end_balance = start_balance + prod['price']
    g.set_userfields('users', cashbox.id, 'balance', end_balance)
    write_ledger(prod, 3, 'bar-cash-payment', end_balance)


# Receive barcode and user code from website and process it.
def prod_consume(prod):
    g.consume_product(product_id = prod['id'], amount = DEFAULT_AMOUNT)

# Find user by custom variable barid - code for credit payments
def user_by_barid(user_barid):
    users = g.users()
    users_data = []
    # Get all users and their custom fields
    for user in users:
        user_fields = g.get_userfields('users', user.id)
        if user_fields['accountingenabled']:
            user_data = {
                'accounting_enabled': user_fields['accountingenabled'],
                'balance': float(user_fields['balance']),
                'barid': user_fields['barid'],
                'name': user.display_name,
                'id': user.id
            }
            users_data.append(user_data)
            
    # Find user with selected barID
    for user in users_data:
        if user['barid'] == str(user_barid):
            return user

    # If no user with this barID and enabled accounting is found, return false
    return False


# Get data about product and price by barcode
def prod_by_barcode(barcode):
    prod = g.product_by_barcode(barcode)
    sell_price = g.get_userfields('products', prod.id)['sellprice']
    prod_data = {
        'id': prod.id,
        'name': prod.name,
        'available': prod.available_amount,
        'price': float(sell_price),
        'barcode': barcode
    }
    return prod_data



app = Flask(__name__)

@app.route('/')
def index():
    return render_template('index.html')

@app.route('/checkout/', methods=['POST'])
def scan():
    barcode = request.form.get('barcode')
    try:
        prod = prod_by_barcode(barcode)
        
    except:
        return redirect('/error/item_not_found')
    
    if int(prod['available']) > 0:
        return render_template('checkout.html', prod = prod)
    else:
        return redirect('/error/item_not_available')

@app.route('/cash-payment/', methods=['POST'])
def cash_payment():
    barcode = request.form.get('barcode')
    prod = prod_by_barcode(barcode)
    prod_consume(prod)
    prod_bill_cash(prod)
    return render_template('cash-payment.html', prod = prod)

@app.route('/account-payment/', methods=['POST'])
def account_payment():
    user_barid = request.form.get('barid')
    barcode = request.form.get('barcode')
    prod = prod_by_barcode(barcode)
    user = user_by_barid(user_barid)
    if user:
        prod_consume(prod)
        end_balance = prod_bill_user(prod, user)
        return render_template('account-payment.html', prod = prod, user = user, balance = end_balance)
    else:
        return redirect('/error/user_not_found')
    

@app.route('/error/<err>')
def error_send(err):
    return render_template('error.html', msg = error_messages[err])


if __name__ == '__main__':
	app.run(host="0.0.0.0")
	app.wsgi_app = ProxyFix(app.wsgi_app, x_proto=1)