import json
import socket
import threading
from http.server import BaseHTTPRequestHandler, ThreadingHTTPServer

import pytest

from coordination_engine.adapters import Hub, SafetyError, Tamq, socket_request
from coordination_engine.config import Config


@pytest.fixture
def peer(tmp_path):
    path = tmp_path / "tamq.sock"
    server = socket.socket(socket.AF_UNIX)
    server.bind(str(path))
    path.chmod(0o600)
    server.listen()
    server.settimeout(0.05)
    state = {
        "requests": [],
        "messages": {},
        "endpoints": [{"endpoint_id": "tmux-amq-123", "repos": '["demo"]'}],
        "protocol": "0.1",
        "capabilities": ["bounded_delivery_ack_v1", "idempotent_send_v1"],
    }
    stop = threading.Event()

    def run():
        while not stop.is_set():
            try:
                conn, _ = server.accept()
            except socket.timeout:
                continue
            with conn:
                request = json.loads(conn.makefile("rb").readline())
                state["requests"].append(request)
                op = request["op"]
                response = {"ok": True}
                if op == "ping":
                    response.update(
                        protocol=state["protocol"], capabilities=state["capabilities"]
                    )
                elif op == "endpoints":
                    response["endpoints"] = state["endpoints"]
                elif op == "send":
                    key = request["idempotency_key"]
                    state["messages"].setdefault(
                        key, "message-" + str(len(state["messages"]))
                    )
                    response.update(message_id=state["messages"][key], state="pending")
                elif op == "message":
                    response["message"] = {
                        "state": "injected",
                        "message_id": request["message_id"],
                    }
                conn.sendall((json.dumps(response) + "\n").encode())

    thread = threading.Thread(target=run)
    thread.start()
    yield path, state
    stop.set()
    thread.join(timeout=2)
    server.close()


@pytest.fixture
def adapter(peer, monkeypatch):
    path, state = peer
    monkeypatch.setattr(
        "coordination_engine.adapters.registry",
        lambda: {"demo": "/demo", "coordination-engine": "/coordination"},
    )
    return Tamq(Config(tamq_socket=path).validate()), state


def test_socket_protocol_and_stable_send(adapter):
    tamq, state = adapter
    lease = {"repo": "demo", "lease_id": "lease", "trigger_id": "trigger"}
    first = tamq.wake(lease, "Inspect work")
    second = tamq.wake(lease, "Inspect work")
    assert first["message_id"] == second["message_id"]
    assert len(state["messages"]) == 1
    send = next(r for r in state["requests"] if r["op"] == "send")
    assert send["metadata"] == {"lease_id": "lease", "trigger_id": "trigger"}
    assert send["endpoint_id"] == "tmux-amq-123"
    assert tamq.receipt(first["message_id"])["state"] == "injected"


@pytest.mark.parametrize(
    "field,value",
    [
        ("protocol", "1.0"),
        ("capabilities", []),
        (
            "endpoints",
            [
                {"endpoint_id": "a", "repos": '["demo"]'},
                {"endpoint_id": "b", "repos": '["demo"]'},
            ],
        ),
    ],
)
def test_protocol_and_ambiguity_gate_before_send(adapter, field, value):
    tamq, state = adapter
    state[field] = value
    with pytest.raises(SafetyError):
        tamq.wake({"repo": "demo", "lease_id": "l", "trigger_id": "t"}, "Inspect")
    assert not state["messages"]


def test_registry_refresh_each_wake(adapter, monkeypatch):
    tamq, state = adapter
    monkeypatch.setattr("coordination_engine.adapters.registry", lambda: {})
    with pytest.raises(SafetyError):
        tamq.wake({"repo": "demo", "lease_id": "l", "trigger_id": "t"}, "Inspect")
    assert not state["requests"]


def test_insecure_socket_rejected(peer):
    path, state = peer
    path.chmod(0o666)
    with pytest.raises(SafetyError):
        socket_request(path, {"op": "ping"})
    assert not state["requests"]


def test_hub_http_snapshot_and_sanitized_projection():
    posts = []

    class Handler(BaseHTTPRequestHandler):
        def log_message(self, *args):
            pass

        def do_GET(self):
            if self.path.startswith("/repos/"):
                data = [{"id": "r", "slug": "demo"}]
            elif self.path == "/workplans/":
                data = [{"id": "p", "repo_id": "r", "status": "active"}]
            elif self.path.startswith("/tasks/"):
                data = [{"id": "t", "workplan_id": "p", "status": "todo"}]
            else:
                data = []
            self.send_response(200)
            self.end_headers()
            self.wfile.write(json.dumps(data).encode())

        def do_POST(self):
            posts.append(
                json.loads(self.rfile.read(int(self.headers["Content-Length"])))
            )
            self.send_response(201)
            self.end_headers()
            self.wfile.write(b'{"id":"receipt"}')

    server = ThreadingHTTPServer(("127.0.0.1", 0), Handler)
    thread = threading.Thread(target=server.serve_forever)
    thread.start()
    try:
        hub = Hub(
            Config(
                api_base=f"http://127.0.0.1:{server.server_port}", repos=["demo"]
            ).validate()
        )
        snapshot = hub.snapshot()
        assert snapshot["repos"] == {"r": "demo"}
        assert snapshot["tasks"][0]["id"] == "t"
        hub.project({"id": "r1", "state": "offered", "reason": "wake_attempt"})
        assert posts[0]["detail"]["id"] == "r1"
        assert posts[0]["event_type"] == "coordination_receipt"
    finally:
        server.shutdown()
        thread.join()
        server.server_close()


@pytest.mark.parametrize(
    "field,value",
    [
        ("protocol", "0.invalid"),
        ("capabilities", None),
        ("endpoints", None),
        ("endpoints", [{"endpoint_id": "e", "repos": None}]),
    ],
)
def test_malformed_peer_stops_before_send(adapter, field, value):
    tamq, state = adapter
    state[field] = value
    with pytest.raises(SafetyError):
        tamq.wake({"repo": "demo", "lease_id": "l", "trigger_id": "t"}, "Inspect")
    assert not state["messages"]