#!/usr/bin/env python3
import asyncio
import jinja2
import aiohttp_jinja2
import json
import os
import re
import __py_include

from io import StringIO
from typing import Optional, Union
from homekit.config import config, AppConfigUnit
from homekit.util import homekit_path, filesize_fmt, seconds_to_human_readable_string
from aiohttp import web
from homekit import http
from homekit.modem import ModemsConfig, E3372, MacroNetWorkType


class WebKbnConfig(AppConfigUnit):
    NAME = 'web_kbn'

    @classmethod
    def schema(cls) -> Optional[dict]:
        return {
            'listen_addr': cls._addr_schema(required=True),
            'assets_public_path': {'type': 'string'}
        }


STATIC_FILES = [
    'bootstrap.min.css',
    'bootstrap.min.js',
    'polyfills.js',
    'app.js',
    'app.css'
]


def get_js_link(file, version) -> str:
    if version:
        file += f'?version={version}'
    return f'<script src="{config.app_config["assets_public_path"]}/{file}" type="text/javascript"></script>'


def get_css_link(file, version) -> str:
    if version:
        file += f'?version={version}'
    return f'<link rel="stylesheet" type="text/css" href="{config.app_config["assets_public_path"]}/{file}">'


def get_head_static() -> str:
    buf = StringIO()
    for file in STATIC_FILES:
        v = 2
        try:
            q_ind = file.index('?')
            v = file[q_ind+1:]
            file = file[:file.index('?')]
        except ValueError:
            pass

        if file.endswith('.js'):
            buf.write(get_js_link(file, v))
        else:
            buf.write(get_css_link(file, v))
    return buf.getvalue()


def get_modem_data(modem_cfg: dict, get_raw=False) -> Union[dict, tuple]:
    cl = E3372(modem_cfg['ip'], legacy_token_auth=modem_cfg['legacy_auth'])

    signal = cl.device_signal
    status = cl.monitoring_status
    traffic = cl.traffic_stats

    if get_raw:
        device_info = cl.device_information
        dialup_conn = cl.dialup_connection
        return signal, status, traffic, device_info, dialup_conn
    else:
        network_type_label = re.sub('^MACRO_NET_WORK_TYPE(_EX)?_', '', MacroNetWorkType(int(status['CurrentNetworkType'])).name)
        return {
            'type': network_type_label,
            'level': int(status['SignalIcon']) if 'SignalIcon' in status else 0,
            'rssi': signal['rssi'],
            'sinr': signal['sinr'],
            'connected_time': seconds_to_human_readable_string(int(traffic['CurrentConnectTime'])),
            'downloaded': filesize_fmt(int(traffic['CurrentDownload'])),
            'uploaded': filesize_fmt(int(traffic['CurrentUpload']))
        }


class WebSite(http.HTTPServer):
    _modems_config: ModemsConfig

    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)

        self._modems_config = ModemsConfig()

        aiohttp_jinja2.setup(
            self.app,
            loader=jinja2.FileSystemLoader(homekit_path('web', 'kbn_templates')),
            autoescape=jinja2.select_autoescape(['html', 'xml']),
        )
        env = aiohttp_jinja2.get_env(self.app)
        env.filters['tojson'] = lambda obj: json.dumps(obj, separators=(',', ':'))

        self.app.router.add_static('/assets/', path=homekit_path('web', 'kbn_assets'))

        self.get('/main.cgi', self.get_index)
        self.get('/modems.cgi', self.get_modems)
        self.get('/modems/info.ajx', self.get_modems_ajax)
        self.get('/modems/verbose.cgi', self.get_modems_verbose)

    async def render_page(self,
                          req: http.Request,
                          template_name: str,
                          title: Optional[str] = None,
                          context: Optional[dict] = None):
        if context is None:
            context = {}
        context = {
            **context,
            'head_static': get_head_static()
        }
        if title is not None:
            context['title'] = title
        response = aiohttp_jinja2.render_template(template_name+'.j2', req, context=context)
        return response

    async def get_index(self, req: http.Request):
        return await self.render_page(req, 'index',
                                      title="Home web site")

    async def get_modems(self, req: http.Request):
        return await self.render_page(req, 'modems',
                                      title='Состояние модемов',
                                      context=dict(modems=self._modems_config))

    async def get_modems_ajax(self, req: http.Request):
        modem = req.query.get('id', None)
        if modem not in self._modems_config.getkeys():
            raise ValueError('invalid modem id')

        modem_cfg = self._modems_config.get(modem)
        loop = asyncio.get_event_loop()
        modem_data = await loop.run_in_executor(None, lambda: get_modem_data(modem_cfg))

        html = aiohttp_jinja2.render_string('modem_data.j2', req, context=dict(
            modem_data=modem_data,
            modem=modem
        ))

        return self.ok({'html': html})

    async def get_modems_verbose(self, req: http.Request):
        modem = req.query.get('id', None)
        if modem not in self._modems_config.getkeys():
            raise ValueError('invalid modem id')

        modem_cfg = self._modems_config.get(modem)
        loop = asyncio.get_event_loop()
        signal, status, traffic, device, dialup_conn = await loop.run_in_executor(None, lambda: get_modem_data(modem_cfg, True))
        data = [
            ['Signal', signal],
            ['Connection', status],
            ['Traffic', traffic],
            ['Device info', device],
            ['Dialup connection', dialup_conn]
        ]

        modem_name = self._modems_config.getfullname(modem)
        return await self.render_page(req, 'modem_verbose',
                                      title=f'Подробная информация о модеме "{modem_name}"',
                                      context=dict(data=data, modem_name=modem_name))


if __name__ == '__main__':
    config.load_app(WebKbnConfig)

    server = WebSite(config.app_config['listen_addr'])
    server.run()