import json
import threading

import httpx
import pytest

from nisse_dev.matrix import MatrixConfig, MatrixTransport, TransportError
from nisse_dev.transport import InboundMessage

CONFIG = MatrixConfig(
    homeserver="https://matrix.test",
    user_id="@nisse-dev:test",
    token="syt_secret",
    room_id="!room:test",
)


def sync_body(events: list[dict], next_batch: str) -> dict:
    return {
        "next_batch": next_batch,
        "rooms": {"join": {"!room:test": {"timeline": {"events": events}}}},
    }


def message_event(sender: str, body: str) -> dict:
    return {
        "type": "m.room.message",
        "sender": sender,
        "content": {"msgtype": "m.text", "body": body},
    }


def test_send_message_puts_event_with_auth_and_unique_txn() -> None:
    seen: list[httpx.Request] = []

    def handler(request: httpx.Request) -> httpx.Response:
        seen.append(request)
        return httpx.Response(200, json={"event_id": "$e"})

    transport = MatrixTransport(CONFIG, http_transport=httpx.MockTransport(handler))
    transport.send_message("hello")
    transport.send_approval_request("plan rev-1")

    first, second = seen
    assert first.headers["authorization"] == "Bearer syt_secret"
    assert "/rooms/!room:test/send/m.room.message/" in str(first.url)
    assert json.loads(first.content) == {"msgtype": "m.text", "body": "hello"}
    assert str(first.url) != str(second.url)  # txn ids must be unique


def test_send_failure_raises_transport_error() -> None:
    def handler(request: httpx.Request) -> httpx.Response:
        return httpx.Response(403, text="forbidden")

    transport = MatrixTransport(CONFIG, http_transport=httpx.MockTransport(handler))
    with pytest.raises(TransportError, match="403"):
        transport.send_message("hello")


class SyncScript:
    """Serves scripted /sync responses, then endless empty ones."""

    def __init__(self, responses: list[dict]) -> None:
        self._responses = responses
        self._i = 0
        self.batches_seen: list[str | None] = []

    def __call__(self, request: httpx.Request) -> httpx.Response:
        assert request.url.path.endswith("/sync")
        self.batches_seen.append(request.url.params.get("since"))
        if self._i < len(self._responses):
            body = self._responses[self._i]
            self._i += 1
            return httpx.Response(200, json=body)
        return httpx.Response(200, json=sync_body([], f"b{self._i}"))


def collect_messages(
    responses: list[dict], expected: int, timeout_s: float = 5.0
) -> list[InboundMessage]:
    received: list[InboundMessage] = []
    done = threading.Event()

    def on_message(msg: InboundMessage) -> None:
        received.append(msg)
        if len(received) >= expected:
            done.set()

    transport = MatrixTransport(
        CONFIG,
        poll_timeout_ms=10,
        http_transport=httpx.MockTransport(SyncScript(responses)),
    )
    transport.on_message(on_message)
    transport.start()
    done.wait(timeout_s)
    transport.close()
    return received


def test_listener_delivers_operator_messages() -> None:
    responses = [
        sync_body([message_event("@don:test", "backlog: never delivered")], "b1"),
        sync_body([message_event("@don:test", "approve")], "b2"),
    ]
    received = collect_messages(responses, expected=1)
    assert received == [InboundMessage(sender="@don:test", text="approve")]


def test_own_and_non_message_events_are_filtered() -> None:
    responses = [
        sync_body([], "b1"),
        sync_body(
            [
                message_event("@nisse-dev:test", "my own echo"),
                {"type": "m.room.member", "sender": "@don:test", "content": {}},
                message_event("@don:test", "status"),
            ],
            "b2",
        ),
    ]
    received = collect_messages(responses, expected=1)
    assert received == [InboundMessage(sender="@don:test", text="status")]


def test_first_sync_learns_position_without_delivering() -> None:
    script = SyncScript([sync_body([message_event("@don:test", "old")], "b1")])
    transport = MatrixTransport(
        CONFIG, poll_timeout_ms=10, http_transport=httpx.MockTransport(script)
    )
    got = threading.Event()
    transport.on_message(lambda msg: got.set())
    transport.start()
    assert not got.wait(0.3)
    transport.close()
    assert script.batches_seen[0] is None  # initial sync carries no since
    assert "b1" in script.batches_seen  # later polls resume from its batch


def test_start_without_handler_raises() -> None:
    transport = MatrixTransport(
        CONFIG, http_transport=httpx.MockTransport(lambda r: httpx.Response(200))
    )
    with pytest.raises(TransportError, match="no message handler"):
        transport.start()


def test_config_from_env_reports_missing() -> None:
    with pytest.raises(TransportError, match="NISSE_MATRIX_TOKEN"):
        MatrixConfig.from_env({"NISSE_MATRIX_HOMESERVER": "https://m"})


def test_config_from_env_custom_room_var() -> None:
    env = {
        "NISSE_MATRIX_HOMESERVER": "https://m/",
        "NISSE_MATRIX_USER_ID": "@nisse-dev:test",
        "NISSE_MATRIX_TOKEN": "t",
        "NISSE_MATRIX_TEST_ROOM_ID": "!t:test",
    }
    config = MatrixConfig.from_env(env, room_var="NISSE_MATRIX_TEST_ROOM_ID")
    assert config.room_id == "!t:test"
    assert config.homeserver == "https://m"  # trailing slash stripped