# -*- coding: utf-8 -*-
"""
    proxy.py
    ~~~~~~~~
    ⚡⚡⚡ Fast, Lightweight, Programmable, TLS interception capable
    proxy server for Application debugging, testing and development.

    :copyright: (c) 2013-present by Abhinav Singh and contributors.
    :license: BSD, see LICENSE for more details.
"""
from typing import Optional

from proxy.http.proxy import HttpProxyBasePlugin
from proxy.http.parser import HttpParser
from proxy.http.codes import httpStatusCodes
from proxy.common.constants import DOT, SLASH
from proxy.common.utils import build_http_response


class ShortLinkPlugin(HttpProxyBasePlugin):
    """Add support for short links in your favorite browsers / applications.

    Enable ShortLinkPlugin and speed up your daily browsing experience.

    Example:
    * f/ for facebook.com
    * g/ for google.com
    * t/ for twitter.com
    * y/ for youtube.com
    * proxy/ for py internal web servers.
    Customize map below for your taste and need.

    Paths are also preserved. E.g. t/imoracle will
    resolve to http://twitter.com/imoracle.
    """

    SHORT_LINKS = {
        b'a': b'amazon.com',
        b'i': b'instagram.com',
        b'l': b'linkedin.com',
        b'f': b'facebook.com',
        b'g': b'google.com',
        b't': b'twitter.com',
        b'w': b'web.whatsapp.com',
        b'y': b'youtube.com',
        b'proxy': b'localhost:8899',
    }

    def before_upstream_connection(
            self, request: HttpParser) -> Optional[HttpParser]:
        if request.host and request.host != b'localhost' and DOT not in request.host:
            # Avoid connecting to upstream
            return None
        return request

    def handle_client_request(
            self, request: HttpParser) -> Optional[HttpParser]:
        if request.host and request.host != b'localhost' and DOT not in request.host:
            if request.host in self.SHORT_LINKS:
                path = SLASH if not request.path else request.path
                self.client.queue(build_http_response(
                    httpStatusCodes.SEE_OTHER, reason=b'See Other',
                    headers={
                        b'Location': b'http://' + self.SHORT_LINKS[request.host] + path,
                        b'Content-Length': b'0',
                        b'Connection': b'close',
                    }
                ))
            else:
                self.client.queue(build_http_response(
                    httpStatusCodes.NOT_FOUND, reason=b'NOT FOUND',
                    headers={
                        b'Content-Length': b'0',
                        b'Connection': b'close',
                    }
                ))
            return None
        return request

    def handle_upstream_chunk(self, chunk: bytes) -> bytes:
        return chunk

    def on_upstream_connection_close(self) -> None:
        pass