
from logging import getLogger

from werkzeug import Request, run_simple
from werkzeug.exceptions import HTTPException, BadRequest
from werkzeug.routing import Map, Rule
from werkzeug.wrappers.json import JSONMixin

from .json import JsonResponse
from .middleware import CsrfCheck, CORS
from .servlets.configure import Configure
from .servlets.diary import Diary
from .servlets.image import Thumbnail, Sparkline
from .servlets.jupyter import Jupyter
from .servlets.kit import Kit
from .servlets.route import Route
from .servlets.search import Search
from .servlets.sector import Sector
from .servlets.statistics import Statistics
from .servlets.upload import Upload
from .static import Static
from ..commands.args import LOG, WEB, SERVICE, VERBOSITY, BIND, PORT, WARN, SECURE, IMAGE_DIR, \
    NOTEBOOK_DIR, JUPYTER
from ..common.args import mm
from ..common.names import BASE
from ..lib.server import BaseController
from ..sql import SystemConstant

log = getLogger(__name__)


MAX_MSG = 1000

DATA = 'data'
REDIRECT = 'redirect'

GET = 'GET'
PUT = 'PUT'
POST = 'POST'


class JSONRequest(Request, JSONMixin):
    pass


class WebController(BaseController):

    def __init__(self, config, max_retries=1, retry_secs=1):
        super().__init__(WEB, config, WebServer, max_retries=max_retries, retry_secs=retry_secs)
        args = config.args
        self.__warn_data = args[WARN + '-' + DATA]
        self.__warn_secure = args[WARN + '-' + SECURE]
        self.__notebook_dir = args[NOTEBOOK_DIR]
        self.__thumbnail_dir = args[IMAGE_DIR]
        self.__jupyter = args[JUPYTER]

    def _build_cmd_and_log(self, ch2):
        log_name = 'web-service.log'
        cmd = f'{ch2} {mm(VERBOSITY)} 0 {mm(LOG)} {log_name} {mm(BASE)} {self._config.args[BASE]} ' \
              f'{WEB} {SERVICE} {mm(WEB + "-" + BIND)} {self._bind} {mm(WEB + "-" + PORT)} {self._port} ' \
              f'{mm(JUPYTER)} {self.__jupyter} ' \
              f'{mm(IMAGE_DIR)} {self.__thumbnail_dir} {mm(NOTEBOOK_DIR)} {self.__notebook_dir}'
        if self.__warn_data: cmd += f' {mm(WARN + "-" + DATA)}'
        if self.__warn_secure: cmd += f' {mm(WARN + "-" + SECURE)}'
        return cmd, log_name

    def _run(self):
        log.debug(f'Binding to {self._bind}:{self._port}')
        app = WebServer(self._config, warn_data=self.__warn_data, warn_secure=self.__warn_secure)
        app = CsrfCheck(app)
        if self._dev:
            app = CORS(app, '*')
        run_simple(self._bind, self._port, app,
                   use_debugger=self._dev, use_reloader=self._dev)

    def _cleanup(self):
        # default in case starting without a database
        self._config.delete_constant(SystemConstant.WEB_URL, default=None)

    def _status(self, running):
        if running:
            print(f'    {self.connection_url()}')
        print()

    def connection_url(self):
        return self._config.get_constant(SystemConstant.WEB_URL, none=True)


def error(exception):
    def handler(*args, **kwargs):
        raise exception()
    return handler


class WebServer:

    def __init__(self, config, warn_data=False, warn_secure=False):
        self.__config = config
        self.__warn_data = warn_data
        self.__warn_secure = warn_secure

        configure = Configure(config)
        diary = Diary()
        jupyter = Jupyter(config)
        kit = Kit()
        route = Route()
        sector = Sector(config)
        static = Static('.static')
        statistics = Statistics()
        upload = Upload(config)
        thumbnail = Thumbnail(config)
        sparkline = Sparkline(config)
        search = Search()

        self.url_map = Map([

            Rule('/api/configure/profiles', endpoint=self.check(configure.read_profiles, config=False), methods=(GET,)),
            Rule('/api/configure/initial', endpoint=self.check(configure.write_profile, config=False), methods=(POST,)),
            Rule('/api/configure/delete', endpoint=self.check(configure.delete, config=False, busy=True), methods=(POST,)),
            Rule('/api/configure/import', endpoint=self.check(configure.read_import, empty=False), methods=(GET,)),
            Rule('/api/configure/import', endpoint=self.check(configure.write_import, empty=False, busy=True), methods=(POST,)),
            Rule('/api/configure/constants', endpoint=self.check(configure.read_constants, empty=False), methods=(GET,)),
            Rule('/api/configure/constant', endpoint=self.check(configure.write_constant, empty=False), methods=(PUT,)),
            Rule('/api/configure/delete-constant', endpoint=self.check(configure.delete_constant, empty=False), methods=(PUT,)),

            Rule('/api/diary/neighbour-activities/<date>', endpoint=diary.read_neighbour_activities, methods=(GET,)),
            Rule('/api/diary/active-days/<month>', endpoint=diary.read_active_days, methods=(GET,)),
            Rule('/api/diary/active-months/<year>', endpoint=diary.read_active_months, methods=(GET,)),
            Rule('/api/diary/statistics', endpoint=self.check(diary.write_statistics), methods=(PUT,)),
            Rule('/api/diary/latest', endpoint=diary.read_latest, methods=(GET,)),
            Rule('/api/diary/<date>', endpoint=self.check(diary.read_diary), methods=(GET,)),

            Rule('/api/search/activity/<query>', endpoint=search.query_activity, methods=(GET,)),
            Rule('/api/search/activity-terms', endpoint=search.read_activity_terms, methods=(GET,)),

            Rule('/api/jupyter/parameters', endpoint=self.check(jupyter.read_parameters), methods=(GET,)),
            Rule('/api/jupyter/<template>', endpoint=jupyter, methods=(GET,)),

            Rule('/api/kit/edit', endpoint=self.check(kit.read_edit, empty=False), methods=(GET,)),
            Rule('/api/kit/retire-item', endpoint=self.check(kit.write_retire_item, empty=False), methods=(PUT,)),
            Rule('/api/kit/replace-model', endpoint=self.check(kit.write_replace_model, empty=False), methods=(PUT,)),
            Rule('/api/kit/add-component', endpoint=self.check(kit.write_add_component, empty=False), methods=(PUT,)),
            Rule('/api/kit/add-group', endpoint=self.check(kit.write_add_group, empty=False), methods=(PUT,)),
            Rule('/api/kit/items', endpoint=self.check(kit.read_items, empty=False), methods=(GET,)),
            Rule('/api/kit/statistics', endpoint=self.check(kit.read_statistics, empty=False), methods=(GET,)),
            Rule('/api/kit/<date>', endpoint=self.check(kit.read_snapshot, empty=False), methods=(GET,)),

            Rule('/api/thumbnail/<int:activity>', endpoint=thumbnail, methods=(GET,)),
            Rule('/api/thumbnail/<int:activity>/<int:sector>', endpoint=thumbnail, methods=(GET,)),

            Rule('/api/route/latlon/activity/<int:activity>', endpoint=self.check(route.read_activity_latlon, empty=False), methods=(GET,)),
            Rule('/api/route/latlon/sector/<int:sector>', endpoint=self.check(route.read_sector_latlon, empty=False), methods=(GET,)),

            Rule('/api/sector', endpoint=self.check(sector.create_sector, empty=False), methods=(POST,)),
            Rule('/api/sector/<int:sector>', endpoint=self.check(sector.read_sector_journals, empty=False), methods=(GET,)),

            Rule('/api/sparkline/<int:statistic>', endpoint=sparkline, methods=(GET,)),
            Rule('/api/sparkline/<int:statistic>/<int:sector>', endpoint=sparkline, methods=(GET,)),
            Rule('/api/sparkline/<int:statistic>/<int:sector>/<int:activity>', endpoint=sparkline, methods=(GET,)),
            Rule('/api/isparkline/<int:statistic>', endpoint=sparkline, methods=(GET,), defaults={'invert': True}),
            Rule('/api/isparkline/<int:statistic>/<int:sector>', endpoint=sparkline, methods=(GET,), defaults={'invert': True}),
            Rule('/api/isparkline/<int:statistic>/<int:sector>/<int:activity>', endpoint=sparkline, methods=(GET,), defaults={'invert': True}),

            Rule('/api/statistics/plottable', endpoint=self.check(statistics.read_all_plottable), methods=(GET,)),
            Rule('/api/statistics/by-date/<name>', endpoint=self.check(statistics.read_values), methods=(GET,)),

            Rule('/api/static/<path:path>', endpoint=static, methods=(GET,)),

            Rule('/api/upload', endpoint=self.check(upload, empty=False), methods=(PUT,)),

            Rule('/api/warnings', endpoint=self.read_warnings, methods=(GET,)),
            Rule('/api/busy', endpoint=self.read_busy, methods=(GET,)),
            Rule('/api/<path:_>', endpoint=error(BadRequest)),

            # ignore path and serve index.html
            Rule('/<path:_>', defaults={'path': 'index.html'}, endpoint=static, methods=(GET,)),
            Rule('/', defaults={'path': 'index.html'}, endpoint=static, methods=(GET,))
        ])

        self.__configure = configure

    def dispatch_request(self, request):
        adapter = self.url_map.bind_to_environ(request.environ)
        try:
            endpoint, values = adapter.match()
            values.pop('_', None)
            if self.__config.db:
                with self.__config.db.session_context() as s:
                    return endpoint(request, s, **values)
            else:
                return endpoint(request, None, **values)
        except HTTPException as e:
            return e

    def wsgi_app(self, environ, start_response):
        request = JSONRequest(environ)
        response = self.dispatch_request(request)
        return response(environ, start_response)

    def __call__(self, environ, start_response):
        return self.wsgi_app(environ, start_response)

    def read_warnings(self, request, s):
        warnings = []
        if self.__warn_data:
            warnings.append({'title': 'Your Data Are Not Stored Permanently',
                             'text': 'The default Docker configuration stores your data within the same '
                                     'container that runs the code.  If you update / delete / prune the '
                                     'container you will lose your data.'})
        if self.__warn_secure:
            warnings.append({'title': 'This System Is Not Secured For External Use',
                             'text': 'Choochoo should not be deployed on a public server.  '
                                     'It is intended only for local, personal use.'})
        return JsonResponse({DATA: warnings})

    def read_busy(self, request, s):
        return JsonResponse({DATA: self.__configure.is_busy()})

    def check(self, handler, config=True, empty=True, busy=False):

        def wrapper(request, s, *args, **kargs):
            if config:
                if not self.__configure.is_configured():
                    log.debug(f'Redirect (not configured)')
                    return JsonResponse({REDIRECT: '/configure/initial'})
                # if we don't care about config we certainly don't care about data
                if s and empty:
                    if self.__configure.is_empty(s):
                        log.debug(f'Redirect (no data)')
                        return JsonResponse({REDIRECT: '/upload'})
                # todo - should we test for if s here?
                if s and busy and self.__config.exists_any_process():
                    return JsonResponse({REDIRECT: '.'})  # todo - does this work?
            data = handler(request, s, *args, **kargs)
            msg = f'Returning data: {data}'
            if len(msg) > MAX_MSG:
                msg = msg[:MAX_MSG-20] + ' ... ' + msg[-10:]
            log.debug(msg)
            return JsonResponse({DATA: data})

        return wrapper
