import wownero
import config
import logging
import db
import six
from functools import wraps
from decimal import Decimal


def log_event(f):
    @wraps(f)
    def decorated_function(*args, **kwargs):
        msg = args[0].message
        logging.info(f'"{f.__name__}" invoked from {msg.from_user["id"]} ({msg.from_user["first_name"]}) - Full command: "{msg.text}"')
        return f(*args, **kwargs)
    return decorated_function

def wallet_rpc_required(f):
    @wraps(f)
    def decorated_function(*args, **kwargs):
        wallet = wownero.Wallet()
        if not wallet.connected:
            logging.error(f'Wallet RPC interface is not available: {args[0].message}')
            args[0].message.reply_text('Wallet RPC interface is not available right now. Try again later.')
            return False
        return f(*args, **kwargs)
    return decorated_function

def registration_required(f):
    @wraps(f)
    def decorated_function(*args, **kwargs):
        wallet = wownero.Wallet()
        if not db.User.filter(telegram_id=args[0].message.from_user['id']):
            args[0].message.reply_text('You are not yet registered. Issue the /register command.')
            return False
        return f(*args, **kwargs)
    return decorated_function


def help(update, context):
    commands = list()
    for i in all_commands:
        pk = all_commands[i]
        if not pk.get('admin', False):
            commands.append('{example} - {help}'.format(
                example=pk['example'],
                help=pk['help']
            ))
    update.message.reply_text('Here are the available commands for this bot:\n\n' + '\n\n'.join(commands))

@wallet_rpc_required
@log_event
def register(update, context):
    uid = update.message.from_user['id']
    un = update.message.from_user['first_name']

    if db.User.filter(telegram_id=uid):
        if db.User.filter(telegram_id=uid, telegram_user=un):
            update.message.reply_text('You are already registered. Use /help to see available bot commands.')
        else:
            update.message.reply_text('Your ID exists in the database already but your `first_name` attribute has changed. Updating.')
            try:
                u = db.User.get(telegram_id=uid)
                u.telegram_user = un
                u.save()
                update.message.reply_text(f'You have been registered again as Telegram ID {uid} but with username {un}.')
            except Exception as e:
                logging.error(f'Unable to update user in DB: {e}. Debug: {update.message}')
                update.message.reply_text('Unable to update your existing account. Ask for help.')
                return False
    else:
        try:
            wallet = wownero.Wallet()
            account_index = wallet.new_account(label=un)
        except Exception as e:
            logging.error(f'Unable to create a new account in wallet RPC: {e}. Debug: {update.message}')
            update.message.reply_text('Unable to create a new account for you. Ask for help.')
            return False
        try:
            u = db.User(
                telegram_id=uid,
                telegram_user=un,
                account_index=account_index,
            )
            u.save()
            reply_text = [
                f'You have been registered as Telegram ID {uid} and username {un} and can now send and receive tips.',
                'Ask for /help to see all available bot commands. Maybe start with /deposit to get your deposit address.'
            ]
            update.message.reply_text(' '.join(reply_text))
        except Exception as e:
            logging.error(f'Unable to register user in DB: {e}. Debug: {update.message}')
            update.message.reply_text('Unable to create a new account for you. Ask for help.')
            return False

@wallet_rpc_required
@registration_required
@log_event
def tip(update, context):
    if len(context.args) < 2:
        update.message.reply_text('Not enough arguments passed.')
        return False
    elif len(context.args) == 2:
        message = ""
    elif len(context.args) > 2:
        message = context.args[2:]

    # validate target user
    if context.args[0].startswith('@'):
        target_un = context.args[0][1:]
    else:
        target_un = context.args[0]

    if target_un == update.message.from_user['first_name']:
        update.message.reply_text('You cannot tip yourself!')
        return False

    if not db.User.filter(telegram_user=target_un):
        reply_text = [
            'That user has not registered and cannot receive tips yet.',
            'If they would like to receive a tip, have them /register with the bot.'
        ]
        update.message.reply_text(' '.join(reply_text))
        return False

    # validate amount
    try:
        amount = Decimal(context.args[1])
    except:
        update.message.reply_text(f'Bad Wownero amount specified; "{context.args[1]}" is not a valid number.')
        return False

    if amount < 1:
        update.message.reply_text('Bad Wownero amount specified. Provide only positive integers or decimals greater than or equal to 1.')
        return False

    tipper = db.User.get(telegram_id=update.message.from_user['id'])
    tipper_balances = wownero.Wallet().balances(account=tipper.account_index)
    if amount >= tipper_balances[1]:
        update.message.reply_text(f'You do not have sufficient funds to send {amount} WOW. Check your /balance')
        return False

    # get target user details
    receiver = db.User.get(telegram_user=target_un)
    address = wownero.Wallet().addresses(account=receiver.account_index)[0]

    # transfer funds to user
    try:
        tx = wownero.Wallet().transfer(dest_address=address, amount=wownero.as_wownero(amount), priority=2, account=tipper.account_index)
        if 'tx_hash' in tx:
            update.message.reply_text(f'Tipped @{target_un} {wownero.from_atomic(tx["amount"])} WOW! Here is the TX ID: {tx["tx_hash"]}')
        else:
            update.message.reply_text('Failed to send a tip. Ask for help.')
    except Exception as e:
        logging.error(f'Unable to send transfer: {e}. Debug: {update.message}')
        update.message.reply_text('Failed to send a tip. Ask for help.')



@wallet_rpc_required
@registration_required
@log_event
def send(update, context):
    if len(context.args) < 2:
        update.message.reply_text('Not enough arguments passed.')
        return False

    # validate address
    if len(context.args[0]) in [97, 107]:
        address = context.args[0]
    else:
        update.message.reply_text('This does not look like a valid Wownero address. Try again.')
        return False

    # validate amount
    try:
        amount = wownero.as_wownero(context.args[1])
    except:
        update.message.reply_text(f'Bad Wownero amount specified; "{context.args[1]}" is not a valid number.')
        return False

    if amount < 1:
        update.message.reply_text('Bad Wownero amount specified. Provide only positive integers or decimals greater than or equal to 1.')
        return False

    sender = db.User.get(telegram_id=update.message.from_user['id'])
    sender_balances = wownero.Wallet().balances(account=sender.account_index)
    if amount > sender_balances[1]:
        update.message.reply_text(f'You do not have sufficient funds to send {amount} WOW. Check your /balance')
        return False

    # transfer funds to given address
    try:
        tx = wownero.Wallet().transfer(dest_address=address, amount=wownero.as_wownero(amount), priority=2, account=sender.account_index)
        if 'tx_hash' in tx:
            update.message.reply_text(f'Sent {wownero.from_atomic(tx["amount"])} WOW! Here is the TX ID: {tx["tx_hash"]}')
        else:
            update.message.reply_text('Failed to send Wownero. Ask for help.')
    except Exception as e:
        logging.error(f'Unable to send transfer: {e}. Debug: {update.message}')
        update.message.reply_text('Failed to send Wownero. Ask for help.')

@wallet_rpc_required
@registration_required
@log_event
def balance(update, context):
    u = db.User.get(telegram_id=update.message.from_user['id'])
    balances = wownero.Wallet().balances(account=u.account_index)
    update.message.reply_text(f'Available balance for {u.telegram_user}: {float(balances[1])} WOW ({float(balances[0])} WOW locked)')

@wallet_rpc_required
@registration_required
@log_event
def deposit(update, context):
    u = db.User.get(telegram_id=update.message.from_user['id'])
    address = wownero.Wallet().addresses(account=u.account_index)[0]
    update.message.reply_text(f'Deposit address for {u.telegram_user}: {address}')

@wallet_rpc_required
@log_event
def debug(update, context):
    if is_tg_admin(update.message.from_user['id']):
        pass
    else:
        update.message.reply_text('you cant do that.')

def is_tg_admin(chat_id):
    if chat_id == config.TG_ADMIN_ID:
        return True
    else:
        return False

all_commands = {
    'tip': {
        'func': tip,
        'example': '/tip <username> <amount> <message>',
        'help': 'Tip a user in Wownero'
    },
    'send': {
        'func': send,
        'example': '/send <address> <amount>',
        'help': 'Send Wownero to a specified Wownero address'
    },
    'balance': {
        'func': balance,
        'example': '/balance',
        'help': 'Show your current balance'
    },
    'register': {
        'func': register,
        'example': '/register',
        'help': 'Register your Telegram user ID to this bot to begin sending and receiving tips',
    },
    'deposit': {
        'func': deposit,
        'example': '/deposit',
        'help': 'Show your Wownero wallet address for transferring funds to'
    },
    'help': {
        'func': help,
        'example': '/help',
        'help': 'Show available commands for the bot',
    },
    'debug': {
        'func': debug,
        'admin': True
    }
}