import importlib.resources
import os
import socket

from flask import Flask
from zope import component

from .error_handlers import register_error_handlers
from ceo_common.interfaces import IConfig, IKerberosService, ILDAPService, IFileService, \
    IMailmanService, IMailService, IUWLDAPService, IHTTPClient, IDatabaseService
from ceo_common.model import Config, HTTPClient, RemoteMailmanService
from ceod.api.spnego import init_spnego
from ceod.model import KerberosService, LDAPService, FileService, \
    MailmanService, MailService, UWLDAPService
from ceod.db import MySQLService, PostgreSQLService


def create_app(flask_config={}):
    app = Flask(__name__)
    app.config.from_mapping(flask_config)

    if not app.config.get('TESTING'):
        register_services(app)

    cfg = component.getUtility(IConfig)
    init_spnego('ceod')

    hostname = socket.gethostname()
    # Only ceod_admin_host should serve the /api/members endpoints because
    # it needs to run kadmin
    if hostname == cfg.get('ceod_admin_host'):
        from ceod.api import members
        app.register_blueprint(members.bp, url_prefix='/api/members')

    # Only offer mailman API if this host is running Mailman
    if hostname == cfg.get('ceod_mailman_host'):
        from ceod.api import mailman
        app.register_blueprint(mailman.bp, url_prefix='/api/mailman')

    if hostname == cfg.get('ceod_database_host'):
        from ceod.api import database
        app.register_blueprint(database.bp, url_prefix='/api/db')

    from ceod.api import groups
    app.register_blueprint(groups.bp, url_prefix='/api/groups')

    from ceod.api import positions
    app.register_blueprint(positions.bp, url_prefix='/api/positions')

    from ceod.api import uwldap
    app.register_blueprint(uwldap.bp, url_prefix='/api/uwldap')

    register_error_handlers(app)

    @app.route('/ping')
    def ping():
        """Health check"""
        return 'pong\n'

    return app


def register_services(app):
    # Config
    if app.config.get('ENV') == 'development' and 'CEOD_CONFIG' not in os.environ:
        with importlib.resources.path('tests', 'ceod_dev.ini') as p:
            config_file = p.__fspath__()
    else:
        config_file = None
    cfg = Config(config_file)
    component.provideUtility(cfg, IConfig)

    # KerberosService
    hostname = socket.gethostname()
    fqdn = socket.getfqdn()
    # Only ceod_admin_host has the ceod/admin key in its keytab
    if hostname == cfg.get('ceod_admin_host'):
        principal = cfg.get('ldap_admin_principal')
    else:
        principal = f'ceod/{fqdn}'
    krb_srv = KerberosService(principal)
    component.provideUtility(krb_srv, IKerberosService)

    # LDAPService
    ldap_srv = LDAPService()
    component.provideUtility(ldap_srv, ILDAPService)

    # HTTPService
    http_client = HTTPClient()
    component.provideUtility(http_client, IHTTPClient)

    # FileService
    if hostname == cfg.get('ceod_fs_root_host'):
        file_srv = FileService()
        component.provideUtility(file_srv, IFileService)

    # MailmanService
    if hostname == cfg.get('ceod_mailman_host'):
        mailman_srv = MailmanService()
    else:
        mailman_srv = RemoteMailmanService()
    component.provideUtility(mailman_srv, IMailmanService)

    # MailService
    mail_srv = MailService()
    component.provideUtility(mail_srv, IMailService)

    # UWLDAPService
    uwldap_srv = UWLDAPService()
    component.provideUtility(uwldap_srv, IUWLDAPService)

    # MySQLService
    if hostname == cfg.get('ceod_database_host'):
        mysql_srv = MySQLService()
        component.provideUtility(mysql_srv, IDatabaseService, 'mysql')

    # PostgreSQLService
    if hostname == cfg.get('ceod_database_host'):
        psql_srv = PostgreSQLService()
        component.provideUtility(psql_srv, IDatabaseService, 'postgresql')