#!/usr/bin/env python
#
# Electrum - lightweight Bitcoin client
# Copyright (C) 2015 Thomas Voegtlin
#
# Permission is hereby granted, free of charge, to any person
# obtaining a copy of this software and associated documentation files
# (the "Software"), to deal in the Software without restriction,
# including without limitation the rights to use, copy, modify, merge,
# publish, distribute, sublicense, and/or sell copies of the Software,
# and to permit persons to whom the Software is furnished to do so,
# subject to the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
# BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
# ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
# CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.

from enum import IntEnum
from typing import Sequence

from PyQt5.QtCore import Qt, QItemSelectionModel
from PyQt5.QtGui import QStandardItemModel, QStandardItem
from PyQt5.QtWidgets import QAbstractItemView
from PyQt5.QtWidgets import QMenu, QVBoxLayout, QTreeWidget, QTreeWidgetItem, QHeaderView

from electrum.i18n import _
from electrum.util import format_time
from electrum.invoices import Invoice, PR_UNPAID, PR_PAID, PR_INFLIGHT, PR_FAILED, PR_TYPE_ONCHAIN, PR_TYPE_LN
from electrum.lnutil import HtlcLog

from .util import MyTreeView, read_QIcon, MySortModel, pr_icons
from .util import CloseButton, Buttons
from .util import WindowModalDialog



ROLE_REQUEST_TYPE = Qt.UserRole
ROLE_REQUEST_ID = Qt.UserRole + 1
ROLE_SORT_ORDER = Qt.UserRole + 2


class InvoiceList(MyTreeView):
    key_role = ROLE_REQUEST_ID

    class Columns(IntEnum):
        DATE = 0
        DESCRIPTION = 1
        AMOUNT = 2
        STATUS = 3

    headers = {
        Columns.DATE: _('Date'),
        Columns.DESCRIPTION: _('Description'),
        Columns.AMOUNT: _('Amount'),
        Columns.STATUS: _('Status'),
    }
    filter_columns = [Columns.DATE, Columns.DESCRIPTION, Columns.AMOUNT]

    def __init__(self, parent):
        super().__init__(parent, self.create_menu,
                         stretch_column=self.Columns.DESCRIPTION)
        self.std_model = QStandardItemModel(self)
        self.proxy = MySortModel(self, sort_role=ROLE_SORT_ORDER)
        self.proxy.setSourceModel(self.std_model)
        self.setModel(self.proxy)
        self.setSortingEnabled(True)
        self.setSelectionMode(QAbstractItemView.ExtendedSelection)
        self.update()

    def refresh_row(self, key, row):
        invoice = self.parent.wallet.invoices.get(key)
        if invoice is None:
            return
        model = self.std_model
        status_item = model.item(row, self.Columns.STATUS)
        status = self.parent.wallet.get_invoice_status(invoice)
        status_str = invoice.get_status_str(status)
        if self.parent.wallet.lnworker:
            log = self.parent.wallet.lnworker.logs.get(key)
            if log and status == PR_INFLIGHT:
                status_str += '... (%d)'%len(log)
        status_item.setText(status_str)
        status_item.setIcon(read_QIcon(pr_icons.get(status)))

    def update(self):
        # not calling maybe_defer_update() as it interferes with conditional-visibility
        self.proxy.setDynamicSortFilter(False)  # temp. disable re-sorting after every change
        self.std_model.clear()
        self.update_headers(self.__class__.headers)
        for idx, item in enumerate(self.parent.wallet.get_unpaid_invoices()):
            key = self.parent.wallet.get_key_for_outgoing_invoice(item)
            if item.is_lightning():
                icon_name = 'lightning.png'
            else:
                icon_name = 'bitcoin.png'
                if item.bip70:
                    icon_name = 'seal.png'
            status = self.parent.wallet.get_invoice_status(item)
            status_str = item.get_status_str(status)
            message = item.message
            amount = item.get_amount_sat()
            timestamp = item.time or 0
            date_str = format_time(timestamp) if timestamp else _('Unknown')
            amount_str = self.parent.format_amount(amount, whitespaces=True)
            labels = [date_str, message, amount_str, status_str]
            items = [QStandardItem(e) for e in labels]
            self.set_editability(items)
            items[self.Columns.DATE].setIcon(read_QIcon(icon_name))
            items[self.Columns.STATUS].setIcon(read_QIcon(pr_icons.get(status)))
            items[self.Columns.DATE].setData(key, role=ROLE_REQUEST_ID)
            items[self.Columns.DATE].setData(item.type, role=ROLE_REQUEST_TYPE)
            items[self.Columns.DATE].setData(timestamp, role=ROLE_SORT_ORDER)
            self.std_model.insertRow(idx, items)
        self.filter()
        self.proxy.setDynamicSortFilter(True)
        # sort requests by date
        self.sortByColumn(self.Columns.DATE, Qt.DescendingOrder)
        self.hide_if_empty()

    def hide_if_empty(self):
        b = self.std_model.rowCount() > 0
        self.setVisible(b)
        self.parent.invoices_label.setVisible(b)

    def create_menu(self, position):
        wallet = self.parent.wallet
        items = self.selected_in_column(0)
        if len(items)>1:
            keys = [item.data(ROLE_REQUEST_ID) for item in items]
            invoices = [wallet.invoices.get(key) for key in keys]
            can_batch_pay = all([i.type == PR_TYPE_ONCHAIN and wallet.get_invoice_status(i) == PR_UNPAID for i in invoices])
            menu = QMenu(self)
            if can_batch_pay:
                menu.addAction(_("Batch pay invoices") + "...", lambda: self.parent.pay_multiple_invoices(invoices))
            menu.addAction(_("Delete invoices"), lambda: self.parent.delete_invoices(keys))
            menu.exec_(self.viewport().mapToGlobal(position))
            return
        idx = self.indexAt(position)
        item = self.item_from_index(idx)
        item_col0 = self.item_from_index(idx.sibling(idx.row(), self.Columns.DATE))
        if not item or not item_col0:
            return
        key = item_col0.data(ROLE_REQUEST_ID)
        invoice = self.parent.wallet.get_invoice(key)
        menu = QMenu(self)
        self.add_copy_menu(menu, idx)
        if invoice.is_lightning():
            menu.addAction(_("Details"), lambda: self.parent.show_lightning_invoice(invoice))
        else:
            if len(invoice.outputs) == 1:
                menu.addAction(_("Copy Address"), lambda: self.parent.do_copy(invoice.get_address(), title='Bitcoin Address'))
            menu.addAction(_("Details"), lambda: self.parent.show_onchain_invoice(invoice))
        status = wallet.get_invoice_status(invoice)
        if status == PR_UNPAID:
            menu.addAction(_("Pay") + "...", lambda: self.parent.do_pay_invoice(invoice))
        if status == PR_FAILED:
            menu.addAction(_("Retry"), lambda: self.parent.do_pay_invoice(invoice))
        if self.parent.wallet.lnworker:
            log = self.parent.wallet.lnworker.logs.get(key)
            if log:
                menu.addAction(_("View log"), lambda: self.show_log(key, log))
        menu.addAction(_("Delete"), lambda: self.parent.delete_invoices([key]))
        menu.exec_(self.viewport().mapToGlobal(position))

    def show_log(self, key, log: Sequence[HtlcLog]):
        d = WindowModalDialog(self, _("Payment log"))
        d.setMinimumWidth(600)
        vbox = QVBoxLayout(d)
        log_w = QTreeWidget()
        log_w.setHeaderLabels([_('Hops'), _('Channel ID'), _('Message')])
        log_w.header().setSectionResizeMode(2, QHeaderView.Stretch)
        log_w.header().setSectionResizeMode(1, QHeaderView.ResizeToContents)
        for payment_attempt_log in log:
            route_str, chan_str, message = payment_attempt_log.formatted_tuple()
            x = QTreeWidgetItem([route_str, chan_str, message])
            log_w.addTopLevelItem(x)
        vbox.addWidget(log_w)
        vbox.addLayout(Buttons(CloseButton(d)))
        d.exec_()
