import logging
import os
from typing import List, Optional, Dict
import traceback

import yaml
from flask import Flask, g, render_template
from flask_restful import Resource, Api, reqparse, abort
from flask_cors import CORS
from pathvalidate import is_valid_filepath

from brackets import get_infobases as br_get_infobases
from webpub1c.webpub1c import VRDConfig, ApacheConfig, urlpath_join, WebPublication

apache_restart_flagfile = 'restart_apache'


def infobase_data_blank(name: str):
    return {
        'name': name,
        'publicated': False,
        'url': '',
        'directory': '',
        'vrd_filename': '',
    }


def publication_data(publication: WebPublication):
    return {
        'name': publication.name,
        'publicated': True,
        'url': publication.url_path,
        'directory': publication.directory,
        'vrd_filename': publication.vrd_filename,
    }


class WebPub1C:
    def __init__(self, config, verbose: bool = False):
        level = logging.INFO if verbose else logging.WARNING
        logging.basicConfig(level=level)
        self._log = logging.getLogger("webpub1c")
        self._log.setLevel(level)

        self._config = config

        vrd_params: Optional[VRDConfig] = self._config.get('vrd_params', None)
        apache_config: str = self._config.get('apache_config', '')
        self._vrd_path: str = self._config.get('vrd_path', '')
        self._dir_path: str = self._config.get('dir_path', '')
        self._url_base: str = self._config.get('url_base', '')

        self._apache_cfg = ApacheConfig(apache_config, self._vrd_path,
                                        self._dir_path, self._url_base,
                                        vrd_params)

    def _is_vrd_path_valid(self) -> bool:
        return os.path.isdir(self._vrd_path)

    def _is_dir_path_valid(self) -> bool:
        return os.path.isdir(self._dir_path)

    def _is_url_base_valid(self) -> bool:
        return is_valid_filepath(self._url_base, platform='posix') and self._url_base.startswith('/')

    def _is_module_valid(self) -> bool:
        if 'platform_path' not in self._config:
            return False
        if 'ws_module' not in self._config:
            return False
        return os.path.isfile(os.path.join(self._config['platform_path'], self._config['ws_module']))

    def check(self):
        return {
            'is_apache_cfg_valid': self._apache_cfg.is_valid(),
            'is_vrd_path_valid': self._is_vrd_path_valid(),
            'is_dir_path_valid': self._is_dir_path_valid(),
            'is_url_base_valid': self._is_url_base_valid(),
            'is_module_valid': self._is_module_valid()
        }

    def has_module(self):
        return self._apache_cfg.has_1cws_module()

    def add_module(self):
        """ Add 1cws module to apache config """

        if self._apache_cfg.has_1cws_module():
            self._log.info('config unchanged')
        else:
            module: str = os.path.join(self._config['platform_path'], self._config['ws_module'])
            self._apache_cfg.add_1cws_module(module)
            self._log.info('module added')

    def list(self) -> List[str]:
        """ List publication names """
        return list(self._apache_cfg.publications)

    def publications(self) -> List[Dict[str, str]]:
        """ List of publications """

        pubs = map(lambda p: publication_data(p), self._apache_cfg.iter())
        return list(pubs)

    def get(self, ibname: str):
        """ Get publication info """

        publication = self._apache_cfg.get_publication(ibname)
        if publication is None:
            return publication

        return publication_data(publication)

    def add(self, ibname: str, url: Optional[str] = None) -> str:
        """ Add new publication """

        publication = self._apache_cfg.create_publication(ibname, url)
        self._apache_cfg.add_publication(publication)
        self._log.info(f'publication added: {ibname}')
        return publication.url_path

    def set_url(self, ibname: str, url: str) -> None:
        """ Set publication url """

        publication = self._apache_cfg.get_publication(ibname)
        if publication is None:
            raise KeyError(f'infobase "{ibname}" not publicated')

        publication.url_path = urlpath_join(self._url_base, url)
        self._apache_cfg.remove_publication(publication.name, destroy=False)
        self._apache_cfg.add_publication(publication)
        self._log.info(f'publication changed: {ibname}')

    def remove(self, ibname: str):
        """ Remove publication """

        self._apache_cfg.remove_publication(ibname)
        self._log.info(f'publication removed: {ibname}')


pub_parser = reqparse.RequestParser()
pub_parser.add_argument('name', required=True, type=str, help='name required')
pub_parser.add_argument('url', type=str)

url_parser = reqparse.RequestParser()
url_parser.add_argument('url', type=str)

url_req_parser = reqparse.RequestParser()
url_req_parser.add_argument('url', type=str, required=True)


def load_config(filename: str = 'config.yml'):
    with open(filename, 'r', encoding='utf-8') as cfg_file:
        return yaml.safe_load(cfg_file)


def get_config():
    if 'config' not in g:
        g.config = load_config()

    return g.config


def get_webpub1c():
    if 'webpub1c' not in g:
        g.webpub1c = WebPub1C(get_config())

    return g.webpub1c


def load_infobases(config) -> List[str]:
    result = []
    if 'infobases' in config and 'server_file' in config['infobases']:
        result = br_get_infobases(config['infobases']['server_file'])
    return result


def validate_url(url: Optional[str]):
    if url is not None:
        if not is_valid_filepath(url, platform='posix'):
            abort(400, message='invalid url')


class InfobasesAvailable(Resource):
    def get(self) -> List[str]:
        cfg = get_config()
        bases = load_infobases(cfg)
        return bases


class Config(Resource):
    def get(self):
        return get_config()


class ConfigTest(Resource):
    def get(self):
        webpub = get_webpub1c()
        return webpub.check()


class InfobasesAll(Resource):
    def get(self) -> List[Dict[str, str]]:
        cfg = get_config()
        webpub = get_webpub1c()
        infobase_names = load_infobases(cfg)
        pubs = webpub.publications()
        result: List[Dict[str, str]] = []
        for name in infobase_names:
            publicated = False
            for pub in filter(lambda x: x["name"] == name, pubs):
                publicated = True
                result.append(pub)
                break
            if not publicated:
                result.append(infobase_data_blank(name))
        return result


class Publications(Resource):
    def get(self) -> List[Dict[str, str]]:
        webpub = get_webpub1c()
        return webpub.publications()

    def put(self):
        args = pub_parser.parse_args()
        validate_url(args.url)
        webpub = get_webpub1c()
        url = args.url
        if args.name in webpub.list():
            abort(409, message=f'publication exists: {args.name}')
        try:
            url = webpub.add(args.name, url)
        except Exception as e:
            abort(422, message=f'publication failed: {args.name}', traceback=traceback.format_exc())
        return {'message': 'created', 'name': args.name, 'url': url}, 201


class Publication(Resource):
    def get(self, name: str):
        webpub = get_webpub1c()
        if name not in webpub.list():
            abort(404, message=f'publication not found: {name}')
        return {
            name: webpub.get(name)
        }

    def put(self, name: str):
        args = url_parser.parse_args()
        validate_url(args.url)
        webpub = get_webpub1c()
        url = args.url
        if name in webpub.list():
            abort(409, message=f'publication exists: {name}')
        try:
            url = webpub.add(name, url)
        except Exception as e:
            abort(422, message=f'publication failed: {name}', traceback=traceback.format_exc())
        return {'message': 'created', 'name': name, 'url': url}, 201

    def delete(self, name: str):
        webpub = get_webpub1c()
        if name not in webpub.list():
            abort(404, message=f'publication not found: {name}')
        try:
            webpub.remove(name)
        except Exception as e:
            abort(422, message='delete failed', traceback=traceback.format_exc())
        return {'message': 'deleted', 'name': name}


class PublicationURL(Resource):
    def get(self, name: str):
        webpub = get_webpub1c()
        if name not in webpub.list():
            abort(404, message=f'publication not found: {name}')
        return {
            'url': webpub.get(name)['url']
        }

    def post(self, name: str):
        args = url_req_parser.parse_args()
        validate_url(args.url)
        webpub = get_webpub1c()
        url = args.url
        if name not in webpub.list():
            abort(404, message=f'publication not found: {name}')
        try:
            webpub.set_url(name, url)
        except Exception as e:
            abort(422, message=f'set url failed', traceback=traceback.format_exc())
        return {'message': 'success', 'name': name, 'url': url}


class EnterpriseModule(Resource):
    def get(self):
        webpub = get_webpub1c()
        if not webpub.has_module():
            abort(404, message='not found')
        return {
            'message': 'found'
        }

    def put(self):
        webpub = get_webpub1c()
        if webpub.has_module():
            abort(304, message='already added')
        webpub.add_module()
        return {
            'message': 'success'
        }


class ApacheRestartFlag(Resource):
    def get(self):
        cfg = get_config()
        flagfile = cfg.get('apache_restart_flagfile', apache_restart_flagfile)
        if not os.path.isfile(flagfile):
            abort(404, message='not found')
        return {
            'message': 'found'
        }

    def put(self):
        cfg = get_config()
        flagfile = cfg.get('apache_restart_flagfile', apache_restart_flagfile)
        if os.path.isfile(flagfile):
            abort(304, message='found')
        with open(flagfile, 'a'):
            pass
        return {
            'message': 'success'
        }


class APIIndex(Resource):
    def get(self):
        return ['infobases-available', 'infobases-all', 'publications',
                'module', 'config', 'config-test', 'apache-restart']


frontend_dir = 'frontend/dist'
app = Flask(__name__, static_url_path='/', static_folder=frontend_dir, template_folder=frontend_dir)
api = Api(app, '/api/v1/')
cors = CORS(app, resources={r"/api/*": {"origins": "*"}})

api.add_resource(InfobasesAvailable, '/infobases-available')
api.add_resource(InfobasesAll, '/infobases-all')
api.add_resource(Publications, '/publications', '/publications/')
api.add_resource(Publication, '/publications/<string:name>')
api.add_resource(PublicationURL, '/publications/<string:name>/url')
api.add_resource(EnterpriseModule, '/module')
api.add_resource(Config, '/config')
api.add_resource(ConfigTest, '/config-test')
api.add_resource(ApacheRestartFlag, '/apache-restart')
api.add_resource(APIIndex, '/')


@app.route('/')
def index():
    return index_content


with app.app_context():
    get_config()
    get_webpub1c()
    index_content = render_template("index.html")


if __name__ == '__main__':
    app.run(debug=True)