import asyncio
import itertools

from pico import start_server, send_json, recv_json

import websockets


class Script:

    def __init__(self):
        self.events = []

    def __add__(self, event):
        self.events.append(('send', event))
        return self

    def __sub__(self, event):
        self.events.append(('recv', event))
        return self


async def _make_client(path, timeout, script):
    state = {}
    error = False
    await asyncio.sleep(timeout)
    async with websockets.connect(path) as websocket:
        for kind, message in script.events:
            if kind == 'recv':
                A, B = message, await recv_json(websocket)
                B.pop('ts')
                if B['kind'] == 'state':
                    state.update(B)
                if A != B:
                    error = True
                    print('-', A)
                    print('+', B)
                    print()
            elif kind == 'send':
                await send_json(websocket, **message)

        while 'online' in state:
            if state['online'][0] == state['username']:
                break
            message = await recv_json(websocket)
            message.pop('ts')
            error = True
            print('+', message)
            print()
            state.update(message)

    if error:
        print('error')
        exit()


async def _test(*clients):
    try:
        gather = asyncio.gather(
            start_server('localhost', 8642, 'TestServer'),
            *clients,
        )
        server, *results = await asyncio.wait_for(gather, timeout=2)
        server.close()
    except asyncio.TimeoutError:
        return

    return results


def test_happy_path():
    client = _make_client('ws://localhost:8642/x', 0.1, Script()
        + {'kind': 'login', 'value': 'TestUser'}
        - {'kind': 'state', 'username': 'TestUser'}
        - {'kind': 'state', 'online': ['TestUser']}
        + {'kind': 'post', 'value': 'Hello World!'}
        - {'kind': 'post', 'value': 'Hello World!', 'source': 'TestUser'}
    )
    return _test(client)


def test_name_taken():
    client1 = _make_client('ws://localhost:8642/x', 0.10, Script()
        + {'kind': 'login', 'value': 'A'}
        - {'kind': 'state', 'username': 'A'}
        - {'kind': 'state', 'online': ['A']}
        - {'kind': 'state', 'online': ['A', 'B']}
    )
    client2 = _make_client('ws://localhost:8642/x', 0.11, Script()
        + {'kind': 'login', 'value': 'A'}
        - {'kind': 'error', 'value': 'Username taken'}
    )
    client3 = _make_client('ws://localhost:8642/x', 0.12, Script()
        + {'kind': 'login', 'value': 'B'}
        - {'kind': 'state', 'username': 'B'}
        - {'kind': 'state', 'online': ['A', 'B']}
        - {'kind': 'state', 'online': ['B']}
    )
    return _test(client1, client2, client3)


def test_interaction():
    client1 = _make_client('ws://localhost:8642/x', 0.10, Script()
        + {'kind': 'login', 'value': 'Alice'}
        - {'kind': 'state', 'username': 'Alice'}
        - {'kind': 'state', 'online': ['Alice']}
        - {'kind': 'state', 'online': ['Alice', 'Bob']}
        + {'kind': 'post', 'value': 'Hey Bob!'}
        - {'kind': 'post', 'value': 'Hey Bob!', 'source': 'Alice'}
        - {'kind': 'post', 'value': 'Howdy!', 'source': 'Bob'}
    )
    client2 = _make_client('ws://localhost:8642/x', 0.11, Script()
        + {'kind': 'login', 'value': 'Bob'}
        - {'kind': 'state', 'username': 'Bob'}
        - {'kind': 'state', 'online': ['Alice', 'Bob']}
        - {'kind': 'post', 'value': 'Hey Bob!', 'source': 'Alice'}
        + {'kind': 'post', 'value': 'Howdy!'}
        - {'kind': 'post', 'value': 'Howdy!', 'source': 'Bob'}
        - {'kind': 'state', 'online': ['Bob']}
    )
    return _test(client1, client2)


def test_rooms():
    client1 = _make_client('ws://localhost:8642/x', 0.10, Script()
        + {'kind': 'login', 'value': 'Dandy'}
        - {'kind': 'state', 'username': 'Dandy'}
        - {'kind': 'state', 'online': ['Dandy']}
        + {'kind': 'post', 'value': 'Hi', 'source': 'Dandy'}
        - {'kind': 'post', 'value': 'Hi', 'source': 'Dandy'}
    )
    client2 = _make_client('ws://localhost:8642/y', 0.10, Script()
        + {'kind': 'login', 'value': 'Dandy'}
        - {'kind': 'state', 'username': 'Dandy'}
        - {'kind': 'state', 'online': ['Dandy']}
        + {'kind': 'post', 'value': 'Hi', 'source': 'Dandy'}
        - {'kind': 'post', 'value': 'Hi', 'source': 'Dandy'}
    )
    return _test(client1, client2)


def test_private_message():
    client1 = _make_client('ws://localhost:8642/x', 0.10, Script()
        + {'kind': 'login', 'value': 'Norman'}
        - {'kind': 'state', 'username': 'Norman'}
        - {'kind': 'state', 'online': ['Norman']}
        - {'kind': 'state', 'online': ['Norman', 'Ray']}
        - {'kind': 'state', 'online': ['Norman', 'Ray', 'Emma']}
        + {'kind': 'post', 'value': '1', 'target': 'Ray'}
        - {'kind': 'post', 'value': '1', 'source': 'Norman'}
        - {'kind': 'post', 'value': '3', 'source': 'Emma'}
    )
    client2 = _make_client('ws://localhost:8642/x', 0.11, Script()
        + {'kind': 'login', 'value': 'Ray'}
        - {'kind': 'state', 'username': 'Ray'}
        - {'kind': 'state', 'online': ['Norman', 'Ray']}
        - {'kind': 'state', 'online': ['Norman', 'Ray', 'Emma']}
        - {'kind': 'post', 'value': '1', 'source': 'Norman'}
        + {'kind': 'post', 'value': '2', 'target': 'Emma'}
        - {'kind': 'post', 'value': '2', 'source': 'Ray'}
        - {'kind': 'state', 'online': ['Ray', 'Emma']}
    )
    client3 = _make_client('ws://localhost:8642/x', 0.12, Script()
        + {'kind': 'login', 'value': 'Emma'}
        - {'kind': 'state', 'username': 'Emma'}
        - {'kind': 'state', 'online': ['Norman', 'Ray', 'Emma']}
        - {'kind': 'post', 'value': '2', 'source': 'Ray'}
        + {'kind': 'post', 'value': '3', 'target': 'Norman'}
        - {'kind': 'post', 'value': '3', 'source': 'Emma'}
        - {'kind': 'state', 'online': ['Ray', 'Emma']}
        - {'kind': 'state', 'online': ['Emma']}
    )
    return _test(client1, client2, client3)


def test_query_is_irrelevant():
    client1 = _make_client('ws://localhost:8642/x?a=0', 0.10, Script()
        + {'kind': 'login', 'value': 'Alice'}
        - {'kind': 'state', 'username': 'Alice'}
        - {'kind': 'state', 'online': ['Alice']}
        - {'kind': 'state', 'online': ['Alice', 'Bob']}
        + {'kind': 'post', 'value': 'Hey Bob!'}
        - {'kind': 'post', 'value': 'Hey Bob!', 'source': 'Alice'}
        - {'kind': 'post', 'value': 'Howdy!', 'source': 'Bob'}
    )
    client2 = _make_client('ws://localhost:8642/x?v=0', 0.11, Script()
        + {'kind': 'login', 'value': 'Bob'}
        - {'kind': 'state', 'username': 'Bob'}
        - {'kind': 'state', 'online': ['Alice', 'Bob']}
        - {'kind': 'post', 'value': 'Hey Bob!', 'source': 'Alice'}
        + {'kind': 'post', 'value': 'Howdy!'}
        - {'kind': 'post', 'value': 'Howdy!', 'source': 'Bob'}
        - {'kind': 'state', 'online': ['Bob']}
    )
    return _test(client1, client2)


if __name__ == '__main__':
    loop = asyncio.get_event_loop()
    for fn_name, fn in list(locals().items()):
        if fn_name.startswith('test_'):
            loop.run_until_complete(fn())