#!/usr/bin/env python3
import include_homekit
import asyncio
import logging
import jinja2
import aiohttp_jinja2
import json
import re
import inverterd
import phonenumbers
import time

from io import StringIO
from aiohttp import web
from typing import Optional, Union
from urllib.parse import quote_plus
from contextvars import ContextVar
from homekit.config import config, AppConfigUnit, is_development_mode, Translation, Language
from homekit.camera import IpcamConfig
from homekit.util import homekit_path, filesize_fmt, seconds_to_human_readable_string, json_serial, validate_ipv4
from homekit.modem import E3372, ModemsConfig, MacroNetWorkType
from homekit.inverter.config import InverterdConfig
from homekit.relay.sunxi_h3_client import RelayClient
from homekit import openwrt, http


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'},
            'pump_addr': cls._addr_schema(required=True),
            'cam_hls_host': cls._addr_schema(required=True, only_ip=True),
            'inverter_grafana_url': {'type': 'string'},
            'sensors_grafana_url': {'type': 'string'},
        }


# files marked with + at the beginning are included by default
common_static_files = {
    '+bootstrap.min.css': 1,
    '+bootstrap.bundle.min.js': 1,
    '+polyfills.js': 1,
    '+app.js': 6,
    '+app.css': 6,
    'hls.js': 1
}
routes = web.RouteTableDef()
logger = logging.getLogger(__name__)
lang_context_var = ContextVar('lang', default=Translation.DEFAULT_LANGUAGE)


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


def get_head_static(additional_files=None) -> str:
    buf = StringIO()
    if additional_files is None:
        additional_files = []

    for file, version in common_static_files.items():
        enabled_by_default = file.startswith('+')
        if not enabled_by_default and file not in additional_files:
            continue

        if enabled_by_default:
            file = file[1:]

        if file.endswith('.js'):
            buf.write(get_js_link(file, version))
        else:
            buf.write(get_css_link(file, version))

    return buf.getvalue()


def get_modem_client(modem_cfg: dict) -> E3372:
    return E3372(modem_cfg['ip'], legacy_token_auth=modem_cfg['legacy_auth'])


def get_modem_data(modem_cfg: dict, get_raw=False) -> Union[dict, tuple]:
    cl = get_modem_client(modem_cfg)

    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']))
        }


def get_pump_client() -> RelayClient:
    addr = config.app_config['pump_addr']
    cl = RelayClient(host=addr.host, port=addr.port)
    cl.connect()
    return cl


def get_inverter_client() -> inverterd.Client:
    cl = inverterd.Client(host=InverterdConfig()['remote_addr'].host)
    cl.connect()
    cl.format(inverterd.Format.JSON)
    return cl


def get_inverter_data() -> tuple:
    cl = get_inverter_client()

    status = json.loads(cl.exec('get-status'))['data']
    rated = json.loads(cl.exec('get-rated'))['data']

    power_direction = status['battery_power_direction'].lower()
    power_direction = re.sub('ge$', 'ging', power_direction)

    charging_rate = ''
    if power_direction == 'charging':
        charging_rate = ' @ %s %s' % (
            status['battery_charge_current']['value'],
            status['battery_charge_current']['unit'])
    elif power_direction == 'discharging':
        charging_rate = ' @ %s %s' % (
            status['battery_discharge_current']['value'],
            status['battery_discharge_current']['unit'])

    html = '<b>Battery:</b> %s %s' % (
        status['battery_voltage']['value'],
        status['battery_voltage']['unit'])
    html += ' (%s%s, ' % (
        status['battery_capacity']['value'],
        status['battery_capacity']['unit'])
    html += '%s%s)' % (power_direction, charging_rate)

    html += "\n"
    html += '<b>Load:</b> %s %s' % (
        status['ac_output_active_power']['value'],
        status['ac_output_active_power']['unit'])
    html += ' (%s%%)' % (status['output_load_percent']['value'],)

    if status['pv1_input_power']['value'] > 0:
        html += "\n"
        html += '<b>Input power:</b> %s %s' % (
            status['pv1_input_power']['value'],
            status['pv1_input_power']['unit'])

    if status['grid_voltage']['value'] > 0 or status['grid_freq']['value'] > 0:
        html += "\n"
        html += '<b>AC input:</b> %s %s' % (
            status['grid_voltage']['value'],
            status['grid_voltage']['unit'])
        html += ', %s %s' % (
            status['grid_freq']['value'],
            status['grid_freq']['unit'])

    html += "\n"
    html += '<b>Priority:</b> %s' % (rated['output_source_priority'],)

    html = html.replace("\n", '<br>')

    return status, rated, html


def get_current_upstream() -> str:
    r = openwrt.get_default_route()
    logger.info(f'default route: {r}')
    mc = ModemsConfig()
    for k, v in mc.items():
        if 'gateway_ip' in v and v['gateway_ip'] == r:
            r = v['ip']
            break
    upstream = None
    for k, v in mc.items():
        if r == v['ip']:
            upstream = k
    if not upstream:
        raise RuntimeError('failed to determine current upstream!')
    return upstream


def get_preferred_lang(req: web.Request) -> Language:
    lang_cookie = req.cookies.get('lang', None)
    if lang_cookie is None:
        return Translation.DEFAULT_LANGUAGE
    try:
        return Language(lang_cookie)
    except ValueError:
        logger.debug(f"unsupported lang_cookie value: {lang_cookie}")
        return Translation.DEFAULT_LANGUAGE


@web.middleware
async def language_middleware(request, handler):
    lang_context_var.set(get_preferred_lang(request))
    return await handler(request)


def lang(key, unit='web_kbn'):
    strings = Translation(unit)
    if isinstance(key, str) and '.' in key:
        return strings.get(lang_context_var.get()).get(key)
    else:
        return strings.get(lang_context_var.get())[key]


async def render(req: web.Request,
                 template_name: str,
                 title: Optional[str] = None,
                 context: Optional[dict] = None,
                 assets: Optional[list] = None):
    if context is None:
        context = {}
    context = {
        **context,
        'head_static': get_head_static(assets),
        'user_lang': lang_context_var.get().value
    }
    if title is not None:
        context['title'] = title
    response = aiohttp_jinja2.render_template(template_name+'.j2', req, context=context)
    return response


@routes.get('/')
async def index0(req: web.Request):
    raise web.HTTPFound('main.cgi')


@routes.get('/main.cgi')
async def index(req: web.Request):
    tabs = ['zones', 'list']
    tab = req.query.get('tab', None)
    if tab and (tab not in tabs or tab == tabs[0]):
        raise web.HTTPFound('main.cgi')
    if tab is None:
        tab = tabs[0]

    ctx = {}
    for k in 'inverter', 'sensors':
        ctx[f'{k}_grafana_url'] = config.app_config[f'{k}_grafana_url']

    cc = IpcamConfig()
    ctx['camzones'] = cc['zones'].keys()
    ctx['allcams'] = cc.get_all_cam_names()
    ctx['lang_enum'] = Language
    ctx['lang_selected'] = lang_context_var.get()
    ctx['tab_selected'] = tab
    ctx['tabs'] = tabs

    return await render(req, 'index',
                        title=lang('sitename'),
                        context=ctx)


@routes.get('/modems.cgi')
async def modems(req: web.Request):
    return await render(req, 'modems',
                        title=lang('modem_statuses'),
                        context=dict(modems=ModemsConfig()))


@routes.get('/modems_info.ajx')
async def modems_ajx(req: web.Request):
    mc = ModemsConfig()
    modem = req.query.get('id', None)
    if modem not in mc.keys():
        raise ValueError('invalid modem id')

    modem_cfg = mc.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 http.ajax_ok({'html': html})


@routes.get('/modems_verbose.cgi')
async def modems_verbose(req: web.Request):
    modem = req.query.get('id', None)
    if modem not in ModemsConfig().keys():
        raise ValueError('invalid modem id')

    modem_cfg = ModemsConfig().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 = Translation('modems').get(lang_context_var.get())[modem]['full']
    return await render(req, 'modem_verbose',
                        title=lang('modem_verbose_info_about_modem') % (modem_name,),
                        context=dict(data=data, modem_name=modem_name))


@routes.get('/sms.cgi')
async def sms(req: web.Request):
    modem = req.query.get('id', list(ModemsConfig().keys())[0])
    is_outbox = int(req.query.get('outbox', 0)) == 1
    error = req.query.get('error', None)
    sent = int(req.query.get('sent', 0)) == 1

    cl = get_modem_client(ModemsConfig()[modem])
    messages = cl.sms_list(1, 20, is_outbox)
    return await render(req, 'sms',
                        title=lang('sms_page_title') % (lang('sms_outbox') if is_outbox else lang('sms_inbox'), modem),
                        context=dict(
                            modems=ModemsConfig(),
                            selected_modem=modem,
                            is_outbox=is_outbox,
                            error=error,
                            is_sent=sent,
                            messages=messages
                        ))


@routes.post('/sms.cgi')
async def sms_post(req: web.Request):
    modem = req.query.get('id', list(ModemsConfig().keys())[0])
    is_outbox = int(req.query.get('outbox', 0)) == 1

    fd = await req.post()
    phone = fd.get('phone', None)
    text = fd.get('text', None)

    return_url = f'sms.cgi?id={modem}&outbox={int(is_outbox)}'
    phone = re.sub('\s+', '', phone)

    if len(phone) > 4:
        country = None
        if not phone.startswith('+'):
            country = 'RU'
        number = phonenumbers.parse(phone, country)
        if not phonenumbers.is_valid_number(number):
            raise web.HTTPFound(f'{return_url}&error=Неверный+номер')
        phone = phonenumbers.format_number(number, phonenumbers.PhoneNumberFormat.E164)

    cl = get_modem_client(ModemsConfig()[modem])
    cl.sms_send(phone, text)
    raise web.HTTPFound(return_url)


@routes.get('/inverter.cgi')
async def inverter(req: web.Request):
    action = req.query.get('do', None)
    if action == 'set-osp':
        val = req.query.get('value')
        if val not in ('sub', 'sbu'):
            raise ValueError('invalid osp value')
        cl = get_inverter_client()
        cl.exec('set-output-source-priority',
                arguments=(val.upper(),))
        raise web.HTTPFound('inverter.cgi')

    status, rated, html = await asyncio.get_event_loop().run_in_executor(None, get_inverter_data)
    return await render(req, 'inverter',
                        title=lang('inverter'),
                        context=dict(status=status, rated=rated, html=html))


@routes.get('/inverter.ajx')
async def inverter_ajx(req: web.Request):
    status, rated, html = await asyncio.get_event_loop().run_in_executor(None, get_inverter_data)
    return http.ajax_ok({'html': html})


@routes.get('/pump.cgi')
async def pump(req: web.Request):
    # TODO
    # these are blocking calls
    # should be rewritten using aio

    cl = get_pump_client()

    action = req.query.get('set', None)
    if action in ('on', 'off'):
        getattr(cl, action)()
        raise web.HTTPFound('pump.cgi')

    status = cl.status()
    return await render(req, 'pump',
                        title=lang('pump'),
                        context=dict(status=status))


@routes.get('/cams.cgi')
async def cams(req: web.Request):
    cc = IpcamConfig()

    cam = req.query.get('id', None)
    zone = req.query.get('zone', None)
    debug_hls = bool(req.query.get('debug_hls', False))
    debug_video_events = bool(req.query.get('debug_video_events', False))

    if cam is not None:
        if not cc.has_camera(int(cam)):
            raise ValueError('invalid camera id')
        cams = [int(cam)]
        mode = {'type': 'single', 'cam': int(cam)}

    elif zone is not None:
        if not cc.has_zone(zone):
            raise ValueError('invalid zone')
        cams = cc['zones'][zone]
        mode = {'type': 'zone', 'zone': zone}

    else:
        cams = cc.get_all_cam_names()
        mode = {'type': 'all'}

    js_config = {
        'host': config.app_config['cam_hls_host'],
        'proto': 'http',
        'cams': cams,
        'hlsConfig': {
            'opts': {
                'startPosition': -1,
                # https://github.com/video-dev/hls.js/issues/3884#issuecomment-842380784
                'liveSyncDuration': 2,
                'liveMaxLatencyDuration': 3,
                'maxLiveSyncPlaybackRate': 2,
                'liveDurationInfinity': True
            },
            'debugVideoEvents': debug_video_events,
            'debug': debug_hls
        }
    }

    return await render(req, 'cams',
                        title=lang('cams'),
                        assets=['hls.js'],
                        context=dict(
                            mode=mode,
                            js_config=js_config,
                        ))


@routes.get('/routing_main.cgi')
async def routing_main(req: web.Request):
    upstream = get_current_upstream()

    set_upstream_to = req.query.get('set-upstream-to', None)
    mc = ModemsConfig()

    if set_upstream_to and set_upstream_to in mc and set_upstream_to != upstream:
        modem = mc[set_upstream_to]
        new_upstream = str(modem['gateway_ip'] if 'gateway_ip' in modem else modem['ip'])
        openwrt.set_upstream(new_upstream)
        raise web.HTTPFound('routing_main.cgi')

    context = dict(
        upstream=upstream,
        selected_tab='main',
        modems=mc.keys()
    )
    return await render(req, 'routing_main', title=lang('routing'), context=context)


@routes.get('/routing_rules.cgi')
async def routing_rules(req: web.Request):
    mc = ModemsConfig()

    action = req.query.get('action', None)
    error = req.query.get('error', None)
    set_name = req.query.get('set', None)
    ip = req.query.get('ip', None)

    def validate_input():
        # validate set
        if not set_name or set_name not in mc:
            raise ValueError(f'invalid set \'{set_name}\'')

        # validate ip
        if not isinstance(ip, str):
            raise ValueError('invalid ip')

        slash_pos = None
        try:
            slash_pos = ip.index('/')
        except ValueError:
            pass

        if slash_pos is not None:
            ip_without_mask = ip[0:slash_pos]
        else:
            ip_without_mask = ip
        if not validate_ipv4(ip_without_mask):
            raise ValueError(f'invalid ip \'{ip}\'')

    base_url = 'routing_rules.cgi'
    if action in ('add', 'del'):
        try:
            validate_input()
        except ValueError as e:
            raise web.HTTPFound(f'{base_url}?error='+quote_plus(str(e)))
        f = getattr(openwrt, f'ipset_{action}')
        output = f(set_name, ip)
        url = base_url
        if output != '':
            url += '?error='+quote_plus(output)
        raise web.HTTPFound(url)

    ipsets = openwrt.ipset_list_all()
    context = dict(
        sets=ipsets,
        selected_tab='rules',
        error=error
    )
    return await render(req, 'routing_rules',
                        title=lang('routing') + ' // ' + lang('routing_rules'),
                        context=context)


@routes.get('/routing_dhcp.cgi')
async def routing_dhcp(req: web.Request):
    leases = openwrt.get_dhcp_leases()
    return await render(req, 'routing_dhcp',
                        title=lang('routing') + ' // DHCP',
                        context=dict(leases=leases, selected_tab='dhcp'))


def init_web_app(app: web.Application):
    app.middlewares.append(language_middleware)
    aiohttp_jinja2.setup(
        app,
        loader=jinja2.FileSystemLoader(homekit_path('web', 'kbn_templates')),
        autoescape=jinja2.select_autoescape(['html', 'xml']),
    )
    env = aiohttp_jinja2.get_env(app)

    # @pass_context is used only to prevent jinja2 from caching the result of lang filter results of constant values.
    # as of now i don't know a better way of doing it
    @jinja2.pass_context
    def filter_lang(ctx, key, unit='web_kbn'):
        return lang(key, unit)

    env.filters['tojson'] = lambda obj: json.dumps(obj, separators=(',', ':'), default=json_serial)
    env.filters['lang'] = filter_lang

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


if __name__ == '__main__':
    config.load_app(WebKbnConfig)
    http.serve(addr=config.app_config['listen_addr'],
               routes=routes,
               before_start=init_web_app)