#!/usr/bin/env python
# -*- coding: utf-8 -*-

#  Copyright (c) 2019. Tobias Kurze

import hashlib
import json
import logging
import os
import re
from datetime import datetime
from json import dumps
from pprint import pprint

from sqlalchemy import and_
from sqlalchemy.exc import IntegrityError

from backend import db
from backend.models import Room
from backend.models.recorder_model import RecorderModel, RecorderCommand, Recorder
from backend.recorder_adapters import get_defined_recorder_adapters
from backend.tools.helpers import calculate_md5_checksum

KNOWN_RECORDERS = {re.compile(r'(?P<name>SMP)[\s]*(?P<number>[\d]+)[\s]*.?[\s]*(?P<options>[\S]*)'): 'SMP',
                   re.compile(
                       r'(?P<name>LectureRecorder X2|LectureRecorder|VGADVI Recorder|DVI Broadcaster DL|DVIRecorderDL)'): 'Epiphan'}


def create_recorder_commands_for_recorder_adapter(command_definitions: dict, recorder_model: RecorderModel):
    existing_recorder_commands = RecorderCommand.query.filter(
        and_(RecorderCommand.name.in_(command_definitions.keys())),
        RecorderCommand.recorder_model == recorder_model)
    existing_commands = set()
    for existing_command in existing_recorder_commands:
        existing_commands.add(existing_command.name)
        args = command_definitions.get(existing_command.name)
        if dumps(existing_command.parameters) != dumps(args):
            logging.warning(
                "The function definition {} collides with an existing definition of the same name "
                "but different parameters!".format(
                    existing_command.name))
            existing_command.last_time_modified = datetime.utcnow()
            existing_command.parameters = args
    db.session.commit()

    for c_d in set(command_definitions.keys()) - existing_commands:
        # print(c_d)
        args = command_definitions.get(c_d)
        # create new recorder command(s)
        r_c = RecorderCommand(name=c_d, parameters=args, recorder_model=recorder_model)
        db.session.add(r_c)
    db.session.commit()


def update_recorder_models_database():
    r_as = get_defined_recorder_adapters()
    for r_a in r_as:
        try:
            r_m = RecorderModel.get_by_adapter_id(r_a["id"])
            model_checksum = calculate_md5_checksum(dumps(r_a["commands"]))
            if r_m is None:
                r_m = RecorderModel(record_adapter_id=r_a["id"], model_name=r_a["name"], checksum=model_checksum,
                                    **r_a.get('class', {}).get_recorder_params())
                db.session.add(r_m)
                db.session.flush()
                db.session.refresh(r_m)
            else:
                if not r_m.model_name == r_a["name"]:
                    r_m.model_name = r_a["name"]
                    r_m.last_time_modified = datetime.utcnow()
                if not model_checksum == r_m.checksum:
                    r_m.last_time_modified = datetime.utcnow()
                    r_m.checksum = model_checksum
                    r_m.last_checksum_change = datetime.utcnow()
                    create_recorder_commands_for_recorder_adapter(r_a["commands"], r_m)
        except IntegrityError as e:
            db.session.rollback()
    db.session.commit()


def get_recorder_room(rec: dict) -> Room():
    rooms = Room.get_by_building_number(rec.get('building', None))
    if rooms.count() <= 1:
        return rooms.first()
    room_name = rec.get('room')
    for room in rooms:
        if all([r_n in room.name for r_n in room_name.split()]):
            return room


def create_default_recorders():
    models = RecorderModel.get_all()
    for m in models:
        print(m)

    f = os.path.abspath(os.path.join(os.path.dirname(__file__), os.path.pardir, 'models', 'initial_recorders.json'))
    with open(f, 'r') as json_file:
        recorders = json.load(json_file)['recorders']
    for r in recorders:
        type = r.get('type')
        firmware_version = r.get('firmware_version', None)
        room_rec_name = r.get('name')
        username = r.get('username', None)
        password = r.get('password', None)
        mac = r.get('mac', None)
        ip4 = r.get('ip', None)
        additional_camera = r.get('additional_camera', False)
        description = r.get('description', '')
        for k_r in KNOWN_RECORDERS:
            if match := k_r.search(type):
                name = match.groupdict().get('name')
                model_number = match.groupdict().get('number', None)

                options = match.groupdict().get('options', None)

                if model_number is not None:
                    model_name = name + model_number[:-1]  # just get prefix (remove last digit)
                else:
                    model_name = KNOWN_RECORDERS[k_r]
                rec_model = RecorderModel.get_where_adapter_id_contains(model_name)

                rec = Recorder(name=room_rec_name + " Recorder", model_name=model_name, recorder_model=rec_model,
                               username=username, password=password, firmware_version=firmware_version)
                rec.mac = mac
                rec.ip = ip4
                rec.additional_camera_connected = additional_camera
                rec.additional_note = description

                rec.room = get_recorder_room(r)
                print(rec)

                db.session.add(rec)
                db.session.flush()
                db.session.refresh(rec)

    print(recorders)


if __name__ == '__main__':
    recorders = Recorder.get_all()
    for r in recorders:
        print("{}: {}".format(r, r.room))
    # db.drop_all()
    # db.create_all()
    # update_recorder_models_database()
    # create_default_recorders()
    # db.session.commit()

    # print(get_recorder_room({"room": "Grosser Hörsaal Bauingenieure", "building": "10.50"}))
    # print(get_recorder_room({"room": "Grosser Hörsaal Bauingenieure", "building": "30.95"}))