from netlib import tcp, wsgi
from netlib.exceptions import HttpReadDisconnect, TlsException
from netlib.http import http1, Request
from .. import version, language


class HTTPProtocol(object):
    def __init__(self, pathod_handler):
        self.pathod_handler = pathod_handler

    def make_error_response(self, reason, body):
        return language.http.make_error_response(reason, body)

    def handle_http_app(self, method, path, headers, body, lg):
        """
            Handle a request to the built-in app.
        """
        if self.pathod_handler.server.noweb:
            crafted = self.pathod_handler.make_http_error_response("Access Denied")
            language.serve(crafted, self.pathod_handler.wfile, self.pathod_handler.settings)
            return None, dict(
                type="error",
                msg="Access denied: web interface disabled"
            )
        lg("app: %s %s" % (method, path))
        req = wsgi.Request("http", method, path, headers, body)
        flow = wsgi.Flow(self.pathod_handler.address, req)
        sn = self.pathod_handler.connection.getsockname()
        a = wsgi.WSGIAdaptor(
            self.pathod_handler.server.app,
            sn[0],
            self.pathod_handler.server.address.port,
            version.NAMEVERSION
        )
        a.serve(flow, self.pathod_handler.wfile)
        return self.pathod_handler.handle_http_request, None

    def handle_http_connect(self, connect, lg):
        """
            Handle a CONNECT request.
        """

        self.pathod_handler.wfile.write(
            'HTTP/1.1 200 Connection established\r\n' +
            ('Proxy-agent: %s\r\n' % version.NAMEVERSION) +
            '\r\n'
        )
        self.pathod_handler.wfile.flush()
        if not self.pathod_handler.server.ssloptions.not_after_connect:
            try:
                cert, key, chain_file_ = self.pathod_handler.server.ssloptions.get_cert(
                    connect[0]
                )
                self.pathod_handler.convert_to_ssl(
                    cert,
                    key,
                    handle_sni=self.pathod_handler.handle_sni,
                    request_client_cert=self.pathod_handler.server.ssloptions.request_client_cert,
                    cipher_list=self.pathod_handler.server.ssloptions.ciphers,
                    method=self.pathod_handler.server.ssloptions.ssl_version,
                    options=self.pathod_handler.server.ssloptions.ssl_options,
                    alpn_select=self.pathod_handler.server.ssloptions.alpn_select,
                )
            except TlsException as v:
                s = str(v)
                lg(s)
                return None, dict(type="error", msg=s)
        return self.pathod_handler.handle_http_request, None

    def read_request(self, lg=None):
        return http1.read_request(self.pathod_handler.rfile)