# -*- coding: utf-8 -*-
##########################################################################
# OpenLP - Open Source Lyrics Projection                                 #
# ---------------------------------------------------------------------- #
# Copyright (c) 2008-2021 OpenLP Developers                              #
# ---------------------------------------------------------------------- #
# 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 <https://www.gnu.org/licenses/>. #
##########################################################################
import argparse
import threading
import websocket
import yaml

from collections import deque
from websocket import create_connection

from test_api.apitest.logger import print_error, print_ok, print_info, print_debug

from test_api.apitest.callbacks import *  # noqa E403


from test_api.apitest.task import Task
from test_api.apitest.task import human_delay


class RunTestsController(object):

    def __init__(self, address, http_port: str, ws_port: str):
        self.address = address
        self.http_port = http_port
        self.ws_port = ws_port
        reserved_result_stage = {'results': ''}
        reserved_result_stage = json.dumps(reserved_result_stage)
        self.reserved_result_stage = bytes(reserved_result_stage, 'utf-8')
        self.received = False
        self.tasks = deque()
        self.pending = deque()
        self.ws_data = deque()
        self.base_url = f'http://{self.address}:{self.http_port}/api/v2/'
        self.debug = False

    def connect(self) -> None:
        print_info("Starting thread")
        self.ws = websocket.WebSocketApp(f'ws://{self.address}:{self.ws_port}',
                                         on_message=self.on_message,
                                         on_close=self.on_close,
                                         on_open=self.on_open,
                                         on_error=self.on_error,
                                         )
        self.wst = threading.Thread(target=lambda: self.ws.run_forever())
        self.wst.daemon = True
        self.wst.start()

        conn_timeout = 5
        while (not self.ws.sock or not self.ws.sock.connected) and conn_timeout:
            human_delay(1)
            conn_timeout -= 1
        if not conn_timeout:
            print_error("Could not connect to WS! Exiting.")

    def on_message(self, message: str) -> None:
        if self.debug:
            print_debug(f"Message returned: {message}")
        if not self.received:
            self.reserved_result_stage = message
        else:
            self.ws_data.append(message)

    @staticmethod
    def on_open() -> None:
        print_info("Socket Listener Opened")

    @staticmethod
    def on_close() -> None:
        print_info("Socket Listener Closed")

    @staticmethod
    def on_error(error: str) -> None:
        print_error(f'WebSocket Error: {error}')

    def load_and_check_sockets(self, first_run: bool = False) -> bool:
        """
        Method to make connect to websockets
        :param first_run:
        :return:
        """
        ws = create_connection(f'ws://{self.address}:{self.ws_port}', ping_interval=None)
        if first_run:
            print_text('Establishing Connection to State')
        self.result_stage = ws.recv()
        good = True
        if self.result_stage:
            if first_run:
                print_ok('Connected to state... Good To test')
            else:
                if not self.reserved_result_stage:
                    self.reserved_result_stage = self.result_stage
        else:
            good = False
            print_error('Not Connected to state ... you have issues')
        ws.close()
        return good

    def read_command_file(self) -> None:
        parser = argparse.ArgumentParser()
        parser.add_argument('rargs', nargs='*', default=[])
        a = parser.parse_args()
        with open(a.rargs[0], 'r') as file:
            commands = yaml.load(file, Loader=yaml.FullLoader)
        for step in commands:
            if step == 'process_name':
                print_info(f'Processing file {commands[step]}')
                continue
            self.tasks.append(Task(self, commands[step]))
        self.process_queue()

    def compare_stage(self):
        """
        :return:
        """
        self.stage_diff = {}
        reserved = json.loads(self.reserved_result_stage.decode('utf-8'))['results']
        current = json.loads(self.result_stage.decode('utf-8'))['results']
        # compare_strings(reserved, current)
        if len(reserved) > 0:
            assert len(reserved) == len(current)
            for a, _ in current.items():
                # compare_strings(reserved[a], current[a])
                if reserved[a] != current[a]:
                    self.stage_diff[a] = {'before': reserved[a], 'after': current[a]}
        self.reserved_result_stage = self.result_stage

    def process_queue(self):
        while len(self.tasks) > 0:
            task = self.tasks.popleft()
            task.run()
            # we have finished but have pending tasks to complete
            if len(self.tasks) == 0 and len(self.pending) > 0:
                pend = self.pending.popleft()
                self.tasks.append(pend)

    def check_websocket_changes(self, mandatory: int, optional: int) -> None:
        while len(self.ws_data) > 0:
            message = self.ws_data.popleft()
            self.result_stage = message
            self.compare_stage()
            if mandatory <= len(self.stage_diff) <= mandatory + optional:
                pass
            else:
                print(f'{mandatory} stage field(s) must have changed and '
                      f'{optional} may change changed- {str(self.stage_diff)}')


def compare_strings(a, b):
    import difflib
    print('{} => {}'.format(a, b))
    if isinstance(a, str):
        for i, s in enumerate(difflib.ndiff(a, b)):
            if s[0] == ' ':
                continue
            elif s[0] == '-':
                print(u'Delete "{}" from position {}'.format(s[-1], i))
            elif s[0] == '+':
                print(u'Add "{}" to position {}'.format(s[-1], i))
        else:
            if a != b:
                print('{} => {} are different'.format(a, b))