#!/usr/bin/env python
#
# Electrum - lightweight Bitcoin client
# Copyright (C) 2012 thomasv@gitorious
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.

import datetime
import json

import PyQt4
from PyQt4.QtGui import *
from PyQt4.QtCore import *
import PyQt4.QtCore as QtCore

from electrum import transaction
from electrum.bitcoin import base_encode
from electrum.i18n import _
from electrum.plugins import run_hook

from util import *

dialogs = []  # Otherwise python randomly garbage collects the dialogs...

def show_transaction(tx, parent, desc=None, prompt_if_unsaved=False):
    d = TxDialog(tx, parent, desc, prompt_if_unsaved)
    dialogs.append(d)
    d.show()

class TxDialog(QDialog, MessageBoxMixin):

    def __init__(self, tx, parent, desc, prompt_if_unsaved):
        '''Transactions in the wallet will show their description.
        Pass desc to give a description for txs not yet in the wallet.
        '''
        self.tx = tx
        self.tx.deserialize()
        self.parent = parent
        self.wallet = parent.wallet
        self.prompt_if_unsaved = prompt_if_unsaved
        self.saved = False
        self.broadcast = False
        self.desc = desc

        QDialog.__init__(self)
        self.setMinimumWidth(660)
        self.setWindowTitle(_("Transaction"))

        vbox = QVBoxLayout()
        self.setLayout(vbox)

        vbox.addWidget(QLabel(_("Transaction ID:")))
        self.tx_hash_e  = ButtonsLineEdit()
        qr_show = lambda: self.parent.show_qrcode(str(self.tx_hash_e.text()), 'Transaction ID', parent=self)
        self.tx_hash_e.addButton(":icons/qrcode.png", qr_show, _("Show as QR code"))
        self.tx_hash_e.setReadOnly(True)
        vbox.addWidget(self.tx_hash_e)
        self.status_label = QLabel()
        vbox.addWidget(self.status_label)

        self.tx_desc = QLabel()
        vbox.addWidget(self.tx_desc)
        self.date_label = QLabel()
        vbox.addWidget(self.date_label)
        self.amount_label = QLabel()
        vbox.addWidget(self.amount_label)
        self.fee_label = QLabel()
        vbox.addWidget(self.fee_label)

        self.add_io(vbox)

        vbox.addStretch(1)

        self.sign_button = b = QPushButton(_("Sign"))
        b.clicked.connect(self.sign)

        self.broadcast_button = b = QPushButton(_("Broadcast"))
        b.clicked.connect(self.do_broadcast)

        self.save_button = b = QPushButton(_("Save"))
        b.clicked.connect(self.save)

        self.cancel_button = b = QPushButton(_("Close"))
        b.clicked.connect(self.close)
        b.setDefault(True)

        self.qr_button = b = QPushButton()
        b.setIcon(QIcon(":icons/qrcode.png"))
        b.clicked.connect(self.show_qr)

        self.copy_button = CopyButton(lambda: str(self.tx), self.parent.app)

        # Action buttons
        self.buttons = [self.sign_button, self.broadcast_button, self.cancel_button]
        # Transaction sharing buttons
        self.sharing_buttons = [self.copy_button, self.qr_button, self.save_button]

        run_hook('transaction_dialog', self)

        hbox = QHBoxLayout()
        hbox.addLayout(Buttons(*self.sharing_buttons))
        hbox.addStretch(1)
        hbox.addLayout(Buttons(*self.buttons))
        vbox.addLayout(hbox)
        self.update()

    def do_broadcast(self):
        self.parent.broadcast_transaction(self.tx, self.desc, parent=self)
        self.broadcast = True
        self.update()

    def closeEvent(self, event):
        if (self.prompt_if_unsaved and not self.saved and not self.broadcast
            and not self.question(_('This transaction is not saved. Close anyway?'), title=_("Warning"))):
            event.ignore()
        else:
            event.accept()
            dialogs.remove(self)

    def show_qr(self):
        text = self.tx.raw.decode('hex')
        text = base_encode(text, base=43)
        try:
            self.parent.show_qrcode(text, 'Transaction', parent=self)
        except Exception as e:
            self.show_message(str(e))


    def sign(self):
        def sign_done(success):
            self.sign_button.setDisabled(False)
            self.prompt_if_unsaved = False
            self.saved = False
            self.update()
        self.sign_button.setDisabled(True)
        cancelled, ret = self.parent.sign_tx(self.tx, sign_done, parent=self)
        if cancelled:
            self.sign_button.setDisabled(False)


    def save(self):
        name = 'signed_%s.txn' % (self.tx.hash()[0:8]) if self.tx.is_complete() else 'unsigned.txn'
        fileName = self.parent.getSaveFileName(_("Select where to save your signed transaction"), name, "*.txn")
        if fileName:
            with open(fileName, "w+") as f:
                f.write(json.dumps(self.tx.as_dict(), indent=4) + '\n')
            self.show_message(_("Transaction saved successfully"))
            self.saved = True


    def update(self):
        is_relevant, is_mine, v, fee = self.wallet.get_wallet_delta(self.tx)
        tx_hash = self.tx.hash()
        desc = self.desc
        time_str = None
        self.broadcast_button.hide()

        if self.tx.is_complete():
            status = _("Signed")

            if tx_hash in self.wallet.transactions.keys():
                desc = self.wallet.get_label(tx_hash)
                conf, timestamp = self.wallet.get_confirmations(tx_hash)
                if timestamp:
                    time_str = datetime.datetime.fromtimestamp(timestamp).isoformat(' ')[:-3]
                else:
                    time_str = _('Pending')
                status = _("%d confirmations")%conf
            else:
                self.broadcast_button.show()
                # cannot broadcast when offline
                if self.parent.network is None:
                    self.broadcast_button.setEnabled(False)
        else:
            s, r = self.tx.signature_count()
            status = _("Unsigned") if s == 0 else _('Partially signed') + ' (%d/%d)'%(s,r)
            tx_hash = _('Unknown');

        if self.wallet.can_sign(self.tx):
            self.sign_button.show()
        else:
            self.sign_button.hide()

        self.tx_hash_e.setText(tx_hash)
        if desc is None:
            self.tx_desc.hide()
        else:
            self.tx_desc.setText(_("Description") + ': ' + desc)
            self.tx_desc.show()
        self.status_label.setText(_('Status:') + ' ' + status)

        if time_str is not None:
            self.date_label.setText(_("Date: %s")%time_str)
            self.date_label.show()
        else:
            self.date_label.hide()

        # if we are not synchronized, we cannot tell
        if not self.wallet.up_to_date:
            return

        if is_relevant:
            if is_mine:
                if fee is not None:
                    self.amount_label.setText(_("Amount sent:")+' %s'% self.parent.format_amount(-v+fee) + ' ' + self.parent.base_unit())
                    self.fee_label.setText(_("Transaction fee")+': %s'% self.parent.format_amount(-fee) + ' ' + self.parent.base_unit())
                else:
                    self.amount_label.setText(_("Amount sent:")+' %s'% self.parent.format_amount(-v) + ' ' + self.parent.base_unit())
                    self.fee_label.setText(_("Transaction fee")+': '+ _("unknown"))
            else:
                self.amount_label.setText(_("Amount received:")+' %s'% self.parent.format_amount(v) + ' ' + self.parent.base_unit())
        else:
            self.amount_label.setText(_("Transaction unrelated to your wallet"))

        run_hook('transaction_dialog_update', self)


    def add_io(self, vbox):

        if self.tx.locktime > 0:
            vbox.addWidget(QLabel("LockTime: %d\n" % self.tx.locktime))

        vbox.addWidget(QLabel(_("Inputs") + ' (%d)'%len(self.tx.inputs)))

        ext = QTextCharFormat()
        rec = QTextCharFormat()
        rec.setBackground(QBrush(QColor("lightgreen")))
        rec.setToolTip(_("Wallet receive address"))
        chg = QTextCharFormat()
        chg.setBackground(QBrush(QColor("yellow")))
        chg.setToolTip(_("Wallet change address"))

        def text_format(addr):
            if self.wallet.is_mine(addr):
                return chg if self.wallet.is_change(addr) else rec
            return ext

        def format_amount(amt):
            return self.parent.format_amount(amt, whitespaces = True)

        i_text = QTextEdit()
        i_text.setFont(QFont(MONOSPACE_FONT))
        i_text.setReadOnly(True)
        i_text.setMaximumHeight(100)
        cursor = i_text.textCursor()
        for x in self.tx.inputs:
            if x.get('is_coinbase'):
                cursor.insertText('coinbase')
            else:
                prevout_hash = x.get('prevout_hash')
                prevout_n = x.get('prevout_n')
                cursor.insertText(prevout_hash[0:8] + '...', ext)
                cursor.insertText(prevout_hash[-8:] + ":%-4d " % prevout_n, ext)
                addr = x.get('address')
                if addr == "(pubkey)":
                    _addr = self.wallet.find_pay_to_pubkey_address(prevout_hash, prevout_n)
                    if _addr:
                        addr = _addr
                if addr is None:
                    addr = _('unknown')
                cursor.insertText(addr, text_format(addr))
                if x.get('value'):
                    cursor.insertText(format_amount(x['value']), ext)
            cursor.insertBlock()

        vbox.addWidget(i_text)
        vbox.addWidget(QLabel(_("Outputs") + ' (%d)'%len(self.tx.outputs)))
        o_text = QTextEdit()
        o_text.setFont(QFont(MONOSPACE_FONT))
        o_text.setReadOnly(True)
        o_text.setMaximumHeight(100)
        cursor = o_text.textCursor()
        for addr, v in self.tx.get_outputs():
            cursor.insertText(addr, text_format(addr))
            if v is not None:
                cursor.insertText('\t', ext)
                cursor.insertText(format_amount(v), ext)
            cursor.insertBlock()
        vbox.addWidget(o_text)