#!/usr/bin/env python3
import asyncio
import pathlib
import socket
import ssl
from typing import List

import aiohttp
from aiohttp import web
from aiohttp.abc import AbstractResolver, ResolveResult
from aiohttp.resolver import DefaultResolver
from aiohttp.test_utils import unused_port


class FakeResolver(AbstractResolver):
    _LOCAL_HOST = {0: "127.0.0.1", socket.AF_INET: "127.0.0.1", socket.AF_INET6: "::1"}

    def __init__(self, fakes, *, loop):
        """fakes -- dns -> port dict"""
        self._fakes = fakes
        self._resolver = DefaultResolver(loop=loop)

    async def resolve(
        self,
        host: str,
        port: int = 0,
        family: socket.AddressFamily = socket.AF_INET,
    ) -> List[ResolveResult]:
        fake_port = self._fakes.get(host)
        if fake_port is not None:
            return [
                {
                    "hostname": host,
                    "host": self._LOCAL_HOST[family],
                    "port": fake_port,
                    "family": family,
                    "proto": 0,
                    "flags": socket.AI_NUMERICHOST,
                }
            ]
        else:
            return await self._resolver.resolve(host, port, family)

    async def close(self) -> None:
        await self._resolver.close()


class FakeFacebook:
    def __init__(self, *, loop):
        self.loop = loop
        self.app = web.Application(loop=loop)
        self.app.router.add_routes(
            [
                web.get("/v2.7/me", self.on_me),
                web.get("/v2.7/me/friends", self.on_my_friends),
            ]
        )
        self.runner = web.AppRunner(self.app)
        here = pathlib.Path(__file__)
        ssl_cert = here.parent / "server.crt"
        ssl_key = here.parent / "server.key"
        self.ssl_context = ssl.create_default_context(ssl.Purpose.CLIENT_AUTH)
        self.ssl_context.load_cert_chain(str(ssl_cert), str(ssl_key))

    async def start(self):
        port = unused_port()
        self.runner = web.AppRunner(self.app)
        await self.runner.setup()
        site = web.TCPSite(self.runner, "127.0.0.1", port, ssl_context=self.ssl_context)
        await site.start()
        return {"graph.facebook.com": port}

    async def stop(self):
        await self.runner.cleanup()

    async def on_me(self, request):
        return web.json_response({"name": "John Doe", "id": "12345678901234567"})

    async def on_my_friends(self, request):
        return web.json_response(
            {
                "data": [
                    {"name": "Bill Doe", "id": "233242342342"},
                    {"name": "Mary Doe", "id": "2342342343222"},
                    {"name": "Alex Smith", "id": "234234234344"},
                ],
                "paging": {
                    "cursors": {
                        "before": "QVFIUjRtc2c5NEl0ajN",
                        "after": "QVFIUlpFQWM0TmVuaDRad0dt",
                    },
                    "next": (
                        "https://graph.facebook.com/v2.7/12345678901234567/"
                        "friends?access_token=EAACEdEose0cB"
                    ),
                },
                "summary": {"total_count": 3},
            }
        )


async def main(loop):
    token = "ER34gsSGGS34XCBKd7u"

    fake_facebook = FakeFacebook(loop=loop)
    info = await fake_facebook.start()
    resolver = FakeResolver(info, loop=loop)
    connector = aiohttp.TCPConnector(loop=loop, resolver=resolver, verify_ssl=False)

    async with aiohttp.ClientSession(connector=connector, loop=loop) as session:
        async with session.get(
            "https://graph.facebook.com/v2.7/me", params={"access_token": token}
        ) as resp:
            print(await resp.json())

        async with session.get(
            "https://graph.facebook.com/v2.7/me/friends", params={"access_token": token}
        ) as resp:
            print(await resp.json())

    await fake_facebook.stop()


loop = asyncio.get_event_loop()
loop.run_until_complete(main(loop))