#!/usr/bin/env python
#
# Electrum - lightweight Bitcoin client
#
# 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.
import json
import locale
import platform
import traceback
import os
import sys
import subprocess

import requests
from PyQt5.QtCore import QObject
import PyQt5.QtCore as QtCore
from PyQt5.QtGui import QIcon
from PyQt5.QtWidgets import *

from electrum.i18n import _
from electrum import ELECTRUM_VERSION, bitcoin, constants

from .util import MessageBoxMixin

issue_template = """<h2>Traceback</h2>
<pre>
{traceback}
</pre>

<h2>Additional information</h2>
<ul>
  <li>Electrum version: {app_version}</li>
  <li>Operating system: {os}</li>
  <li>Wallet type: {wallet_type}</li>
  <li>Locale: {locale}</li>
</ul>
"""
report_server = "https://crashhub.electrum.org/crash"


class Exception_Window(QWidget, MessageBoxMixin):
    _active_window = None

    def __init__(self, main_window, exctype, value, tb):
        self.exc_args = (exctype, value, tb)
        self.main_window = main_window
        QWidget.__init__(self)
        self.setWindowTitle('Electrum - ' + _('An Error Occured'))
        self.setMinimumSize(600, 300)

        main_box = QVBoxLayout()

        heading = QLabel('<h2>' + _('Sorry!') + '</h2>')
        main_box.addWidget(heading)
        main_box.addWidget(QLabel(_('Something went wrong while executing Electrum.')))

        main_box.addWidget(QLabel(
            _('To help us diagnose and fix the problem, you can send us a bug report that contains useful debug '
              'information:')))

        collapse_info = QPushButton(_("Show report contents"))
        collapse_info.clicked.connect(
            lambda: self.msg_box(QMessageBox.NoIcon,
                                 self, "Report contents", self.get_report_string()))
        main_box.addWidget(collapse_info)

        main_box.addWidget(QLabel(_("Please briefly describe what led to the error (optional):")))

        self.description_textfield = QTextEdit()
        self.description_textfield.setFixedHeight(50)
        main_box.addWidget(self.description_textfield)

        main_box.addWidget(QLabel(_("Do you want to send this report?")))

        buttons = QHBoxLayout()

        report_button = QPushButton(_('Send Bug Report'))
        report_button.clicked.connect(self.send_report)
        report_button.setIcon(QIcon(":icons/tab_send.png"))
        buttons.addWidget(report_button)

        never_button = QPushButton(_('Never'))
        never_button.clicked.connect(self.show_never)
        buttons.addWidget(never_button)

        close_button = QPushButton(_('Not Now'))
        close_button.clicked.connect(self.close)
        buttons.addWidget(close_button)

        main_box.addLayout(buttons)

        self.setLayout(main_box)
        self.show()

    def send_report(self):
        if constants.net.GENESIS[-4:] not in ["4943", "e26f"] and ".electrum.org" in report_server:
            # Gah! Some kind of altcoin wants to send us crash reports.
            self.main_window.show_critical(_("Please report this issue manually."))
            return
        report = self.get_traceback_info()
        report.update(self.get_additional_info())
        report = json.dumps(report)
        try:
            response = requests.post(report_server, data=report, timeout=20)
        except BaseException as e:
            traceback.print_exc(file=sys.stderr)
            self.main_window.show_critical(_('There was a problem with the automatic reporting:') + '\n' +
                                           str(e) + '\n' +
                                           _("Please report this issue manually."))
            return
        else:
            QMessageBox.about(self, "Crash report", response.text)
            self.close()

    def on_close(self):
        Exception_Window._active_window = None
        sys.__excepthook__(*self.exc_args)
        self.close()

    def show_never(self):
        self.main_window.config.set_key("show_crash_reporter", False)
        self.close()

    def closeEvent(self, event):
        self.on_close()
        event.accept()

    def get_traceback_info(self):
        exc_string = str(self.exc_args[1])
        stack = traceback.extract_tb(self.exc_args[2])
        readable_trace = "".join(traceback.format_list(stack))
        id = {
            "file": stack[-1].filename,
            "name": stack[-1].name,
            "type": self.exc_args[0].__name__
        }
        return {
            "exc_string": exc_string,
            "stack": readable_trace,
            "id": id
        }

    def get_additional_info(self):
        args = {
            "app_version": ELECTRUM_VERSION,
            "os": platform.platform(),
            "wallet_type": "unknown",
            "locale": locale.getdefaultlocale()[0],
            "description": self.description_textfield.toPlainText()
        }
        try:
            args["wallet_type"] = self.main_window.wallet.wallet_type
        except:
            # Maybe the wallet isn't loaded yet
            pass
        try:
            args["app_version"] = self.get_git_version()
        except:
            # This is probably not running from source
            pass
        return args

    def get_report_string(self):
        info = self.get_additional_info()
        info["traceback"] = "".join(traceback.format_exception(*self.exc_args))
        return issue_template.format(**info)

    @staticmethod
    def get_git_version():
        dir = os.path.dirname(os.path.realpath(sys.argv[0]))
        version = subprocess.check_output(['git', 'describe', '--always'], cwd=dir)
        return str(version, "utf8").strip()


def _show_window(*args):
    if not Exception_Window._active_window:
        Exception_Window._active_window = Exception_Window(*args)


class Exception_Hook(QObject):
    _report_exception = QtCore.pyqtSignal(object, object, object, object)

    def __init__(self, main_window, *args, **kwargs):
        super(Exception_Hook, self).__init__(*args, **kwargs)
        if not main_window.config.get("show_crash_reporter", default=True):
            return
        self.main_window = main_window
        sys.excepthook = self.handler
        self._report_exception.connect(_show_window)

    def handler(self, *args):
        self._report_exception.emit(self.main_window, *args)
