import kin

# Init SDK without a secret key, in the public Stellar network (for generic blockchain queries)
sdk = kin.SDK()

# Init SDK without a secret key, for Stellar testnet
sdk = kin.SDK(network='TESTNET')

# Init SDK without a secret key, with specific Horizon server, running on Stellar testnet
sdk = kin.SDK(horizon_endpoint_uri='http://my.horizon.uri', network='TESTNET')

# Init SDK with wallet secret key, on public network
sdk = kin.SDK(secret_key='my key')

# Init SDK with several channels, on public network
sdk = kin.SDK(secret_key='my key', channel_secret_keys=['key1', 'key2', ...])

# Get the address of my wallet account. The address is derived from the secret key the SDK was inited with.
address = sdk.get_address()

# Get native (lumen) balance of the SDK wallet
native_balance = sdk.get_native_balance()

# Get KIN balance of the SDK wallet
kin_balance = sdk.get_kin_balance()

# Get native (lumen) balance of some account
native_balance = sdk.get_account_native_balance('address')

# Get KIN balance of some account
kin_balance = sdk.get_account_kin_balance('address')

# returns kin.AccountData
account_data = sdk.get_account_data('address')

account_exists = sdk.check_account_exists('address')

# create a new account prefunded with MIN_ACCOUNT_BALANCE lumens
tx_hash = sdk.create_account('address')

# create a new account prefunded with a specified amount of native currency (lumens).
tx_hash = sdk.create_account('address', starting_balance=1000)

# create a new activated account
tx_hash = sdk.create_account('address', starting_balance=1000, activate=True)  

# check if KIN is trusted by some account
kin_trusted = sdk.check_account_activated('address')

# send native currency (lumens) to some address
tx_hash = sdk.send_native('address', 100, memo_text='order123')

# send KIN to some address
tx_hash = sdk.send_kin('address', 1000, memo_text='order123')

# create a transaction, for example a new account
tx_hash = sdk.create_account('address')
# get transaction data, returns kin.TransactionData
tx_data = sdk.get_transaction_data(tx_hash)

# define a callback function that receives an address and a kin.TransactionData object
def print_callback(address, tx_data):
    print(address, tx_data)
    
# start monitoring KIN payments related to the SDK wallet account
sdk.monitor_kin_payments(print_callback)

# start monitoring KIN payments related to a list of addresses
sdk.monitor_accounts_kin_payments(['address1', 'address2'], print_callback)

# start monitoring all transactions related to a list of addresses
sdk.monitor_accounts_transactions(['address1', 'address2'], print_callback)

# setup your orders cache
orders = {}

# define a callback function that validates payments and marks orders as completed
def payment_callback(address, tx_data):
    order_id = tx_data.memo
    if order_id not in orders:
        logging.warn('order not found: {}'.format(order_id))
        return
    
    order = orders[order_id]
    
    # check that the order is not yet completed
    if order['completed'] is not None:
        logging.warn('order {} is already completed'.format(order_id))
        return
        
    # check that the amount matches 
    if tx_data.operations[0].amount != order['amount']:
        logging.warn('wrong amount paid for order {}: received {}, need {}'
            .format(order_id, tx_data.operations[0].amount, order['amount']))
        return
        
    # all good
    order['completed'] = datetime.now()


# start monitoring KIN payments related to the SDK wallet account
sdk.monitor_kin_payments(payment_callback)   

# when an order comes, store its data in the cache
order_id = generate_order_id()
orders[order_id] = {
    'user_id': user_id,
    'product_id': product_id,
    'amount': product_cost,
    'created': datetime.now(),
    'completed': None
}

# now pass this order_id to the user and have him insert it into the memo field of his transaction.
# After he submits the transaction, the payment_callback above will catch it and update the order data.

status = sdk.get_status()
print status
#  {
#     'sdk_version': '0.2.0',
#     'channels': {
#         'all': 5,  
#         'free': 5  
#     }, 
#     'kin_asset': {
#         'code': 'KIN', 
#         'issuer': '<issuer address>'
#     }, 
#     'network': 'TESTNET', 
#     'horizon': {
#         'uri': '<horizon uri>', 
#         'online': True,
#         'error': None 
#     }, 
#     'address': '<sdk wallet address>',
#     'transport': {
#         'pool_size': 7,
#         'num_retries': 5,
#         'request_timeout': 11,
#         'retry_statuses': [413, 429, 503, 504],
#         'backoff_factor': 0.5
#     }
#   }