from decimal import Decimal
import getpass
import datetime
import logging

from electrum import util
from electrum import WalletStorage, Wallet
from electrum.wallet_db import WalletDB
from electrum.util import format_satoshis
from electrum.bitcoin import is_address, COIN
from electrum.transaction import PartialTxOutput
from electrum.network import TxBroadcastError, BestEffortRequestFailed
from electrum.logging import console_stderr_handler

_ = lambda x:x  # i18n

# minimal fdisk like gui for console usage
# written by rofl0r, with some bits stolen from the text gui (ncurses)


class ElectrumGui:

    def __init__(self, config, daemon, plugins):
        self.config = config
        self.network = daemon.network
        storage = WalletStorage(config.get_wallet_path())
        if not storage.file_exists:
            print("Wallet not found. try 'electrum-nmc create'")
            exit()
        if storage.is_encrypted():
            password = getpass.getpass('Password:', stream=None)
            storage.decrypt(password)

        db = WalletDB(storage.read(), manual_upgrades=False)

        self.done = 0
        self.last_balance = ""

        console_stderr_handler.setLevel(logging.CRITICAL)

        self.str_recipient = ""
        self.str_description = ""
        self.str_amount = ""
        self.str_fee = ""

        self.wallet = Wallet(db, storage, config=config)
        self.wallet.start_network(self.network)
        self.contacts = self.wallet.contacts

        util.register_callback(self.on_network, ['wallet_updated', 'network_updated', 'banner'])
        self.commands = [_("[h] - displays this help text"), \
                         _("[i] - display transaction history"), \
                         _("[o] - enter payment order"), \
                         _("[p] - print stored payment order"), \
                         _("[s] - send stored payment order"), \
                         _("[r] - show own receipt addresses"), \
                         _("[c] - display contacts"), \
                         _("[b] - print server banner"), \
                         _("[q] - quit") ]
        self.num_commands = len(self.commands)

    def on_network(self, event, *args):
        if event in ['wallet_updated', 'network_updated']:
            self.updated()
        elif event == 'banner':
            self.print_banner()

    def main_command(self):
        self.print_balance()
        c = input("enter command: ")
        if c == "h" : self.print_commands()
        elif c == "i" : self.print_history()
        elif c == "o" : self.enter_order()
        elif c == "p" : self.print_order()
        elif c == "s" : self.send_order()
        elif c == "r" : self.print_addresses()
        elif c == "c" : self.print_contacts()
        elif c == "b" : self.print_banner()
        elif c == "n" : self.network_dialog()
        elif c == "e" : self.settings_dialog()
        elif c == "q" : self.done = 1
        else: self.print_commands()

    def updated(self):
        s = self.get_balance()
        if s != self.last_balance:
            print(s)
        self.last_balance = s
        return True

    def print_commands(self):
        self.print_list(self.commands, "Available commands")

    def print_history(self):
        width = [20, 40, 14, 14]
        delta = (80 - sum(width) - 4)/3
        format_str = "%"+"%d"%width[0]+"s"+"%"+"%d"%(width[1]+delta)+"s"+"%" \
        + "%d"%(width[2]+delta)+"s"+"%"+"%d"%(width[3]+delta)+"s"
        messages = []

        for hist_item in reversed(self.wallet.get_history()):
            if hist_item.tx_mined_status.conf:
                timestamp = hist_item.tx_mined_status.timestamp
                try:
                    time_str = datetime.datetime.fromtimestamp(timestamp).isoformat(' ')[:-3]
                except Exception:
                    time_str = "unknown"
            else:
                time_str = 'unconfirmed'

            label = self.wallet.get_label_for_txid(hist_item.txid)
            messages.append(format_str % (time_str, label, format_satoshis(delta, whitespaces=True),
                                          format_satoshis(hist_item.balance, whitespaces=True)))

        self.print_list(messages[::-1], format_str%( _("Date"), _("Description"), _("Amount"), _("Balance")))


    def print_balance(self):
        print(self.get_balance())

    def get_balance(self):
        if self.wallet.network.is_connected():
            if not self.wallet.up_to_date:
                msg = _( "Synchronizing..." )
            else:
                c, u, x =  self.wallet.get_balance(hide_expired=True)
                msg = _("Balance")+": %f  "%(Decimal(c) / COIN)
                if u:
                    msg += "  [%f unconfirmed]"%(Decimal(u) / COIN)
                if x:
                    msg += "  [%f unmatured]"%(Decimal(x) / COIN)
        else:
                msg = _( "Not connected" )

        return(msg)


    def print_contacts(self):
        messages = map(lambda x: "%20s   %45s "%(x[0], x[1][1]), self.contacts.items())
        self.print_list(messages, "%19s  %25s "%("Key", "Value"))

    def print_addresses(self):
        messages = map(lambda addr: "%30s    %30s       "%(addr, self.wallet.get_label(addr)), self.wallet.get_addresses())
        self.print_list(messages, "%19s  %25s "%("Address", "Label"))

    def print_order(self):
        print("send order to " + self.str_recipient + ", amount: " + self.str_amount \
              + "\nfee: " + self.str_fee + ", desc: " + self.str_description)

    def enter_order(self):
        self.str_recipient = input("Pay to: ")
        self.str_description = input("Description : ")
        self.str_amount = input("Amount: ")
        self.str_fee = input("Fee: ")

    def send_order(self):
        self.do_send()

    def print_banner(self):
        for i, x in enumerate( self.wallet.network.banner.split('\n') ):
            print( x )

    def print_list(self, lst, firstline):
        lst = list(lst)
        self.maxpos = len(lst)
        if not self.maxpos: return
        print(firstline)
        for i in range(self.maxpos):
            msg = lst[i] if i < len(lst) else ""
            print(msg)


    def main(self):
        while self.done == 0: self.main_command()

    def do_send(self):
        if not is_address(self.str_recipient):
            print(_('Invalid Namecoin address'))
            return
        try:
            amount = int(Decimal(self.str_amount) * COIN)
        except Exception:
            print(_('Invalid Amount'))
            return
        try:
            fee = int(Decimal(self.str_fee) * COIN)
        except Exception:
            print(_('Invalid Fee'))
            return

        if self.wallet.has_password():
            password = self.password_dialog()
            if not password:
                return
        else:
            password = None

        c = ""
        while c != "y":
            c = input("ok to send (y/n)?")
            if c == "n": return

        try:
            tx = self.wallet.mktx(outputs=[PartialTxOutput.from_address_and_value(self.str_recipient, amount)],
                                  password=password,
                                  fee=fee)
        except Exception as e:
            print(repr(e))
            return

        if self.str_description:
            self.wallet.set_label(tx.txid(), self.str_description)

        print(_("Please wait..."))
        try:
            self.network.run_from_another_thread(self.network.broadcast_transaction(tx))
        except TxBroadcastError as e:
            msg = e.get_message_for_gui()
            print(msg)
        except BestEffortRequestFailed as e:
            msg = repr(e)
            print(msg)
        else:
            print(_('Payment sent.'))
            #self.do_clear()
            #self.update_contacts_tab()

    def network_dialog(self):
        print("use 'electrum-nmc setconfig server/proxy' to change your network settings")
        return True


    def settings_dialog(self):
        print("use 'electrum-nmc setconfig' to change your settings")
        return True

    def password_dialog(self):
        return getpass.getpass()


#   XXX unused

    def run_receive_tab(self, c):
        #if c == 10:
        #    out = self.run_popup('Address', ["Edit label", "Freeze", "Prioritize"])
        return

    def run_contacts_tab(self, c):
        pass
