from __future__ import annotations


def _create_chat(client, agent_id: str, node_id: str, ref: str) -> str:
    r = client.post(
        "/api/chats",
        json={
            "agent_id": agent_id,
            "node_id": node_id,
            "source": "web",
            "external_chat_ref": ref,
        },
    )
    assert r.status_code == 200, r.text
    return r.json()["chat"]["chat_id"]


def test_send_idempotency_header_replays_same_message_id(sofiia_client, sofiia_module, monkeypatch):
    async def _fake_infer(base_url, agent_id, text, **kwargs):
        return {"response": f"ok:{agent_id}:{text}", "backend": "fake", "model": "fake-model"}

    monkeypatch.setattr(sofiia_module, "infer", _fake_infer)
    chat_id = _create_chat(sofiia_client, "sofiia", "NODA2", "idem-header")
    headers = {"Idempotency-Key": "idem-header-1"}

    r1 = sofiia_client.post(f"/api/chats/{chat_id}/send", json={"text": "ping"}, headers=headers)
    r2 = sofiia_client.post(f"/api/chats/{chat_id}/send", json={"text": "ping"}, headers=headers)
    assert r1.status_code == 200 and r2.status_code == 200

    j1, j2 = r1.json(), r2.json()
    assert j1["message"]["message_id"] == j2["message"]["message_id"]
    assert j1["idempotency"]["replayed"] is False
    assert j2["idempotency"]["replayed"] is True


def test_send_idempotency_body_replays_same_message_id(sofiia_client, sofiia_module, monkeypatch):
    async def _fake_infer(base_url, agent_id, text, **kwargs):
        return {"response": f"ok:{agent_id}:{text}", "backend": "fake", "model": "fake-model"}

    monkeypatch.setattr(sofiia_module, "infer", _fake_infer)
    chat_id = _create_chat(sofiia_client, "sofiia", "NODA2", "idem-body")
    payload = {"text": "ping", "idempotency_key": "idem-body-1"}

    r1 = sofiia_client.post(f"/api/chats/{chat_id}/send", json=payload)
    r2 = sofiia_client.post(f"/api/chats/{chat_id}/send", json=payload)
    assert r1.status_code == 200 and r2.status_code == 200

    j1, j2 = r1.json(), r2.json()
    assert j1["message"]["message_id"] == j2["message"]["message_id"]
    assert j1["idempotency"]["replayed"] is False
    assert j2["idempotency"]["replayed"] is True


def test_send_idempotency_header_overrides_body(sofiia_client, sofiia_module, monkeypatch):
    async def _fake_infer(base_url, agent_id, text, **kwargs):
        return {"response": f"ok:{agent_id}:{text}", "backend": "fake", "model": "fake-model"}

    monkeypatch.setattr(sofiia_module, "infer", _fake_infer)
    chat_id = _create_chat(sofiia_client, "sofiia", "NODA2", "idem-override")

    r1 = sofiia_client.post(
        f"/api/chats/{chat_id}/send",
        json={"text": "ping-a", "idempotency_key": "body-a"},
        headers={"Idempotency-Key": "header-wins"},
    )
    r2 = sofiia_client.post(
        f"/api/chats/{chat_id}/send",
        json={"text": "ping-b", "idempotency_key": "body-b"},
        headers={"Idempotency-Key": "header-wins"},
    )
    assert r1.status_code == 200 and r2.status_code == 200
    j1, j2 = r1.json(), r2.json()
    assert j1["message"]["message_id"] == j2["message"]["message_id"]
    assert j2["idempotency"]["replayed"] is True
    assert j2["idempotency"]["key"] == "header-wins"


def test_send_idempotency_different_keys_create_different_message_ids(sofiia_client, sofiia_module, monkeypatch):
    async def _fake_infer(base_url, agent_id, text, **kwargs):
        return {"response": f"ok:{agent_id}:{text}", "backend": "fake", "model": "fake-model"}

    monkeypatch.setattr(sofiia_module, "infer", _fake_infer)
    chat_id = _create_chat(sofiia_client, "sofiia", "NODA2", "idem-different")

    r1 = sofiia_client.post(
        f"/api/chats/{chat_id}/send",
        json={"text": "ping", "idempotency_key": "k1"},
    )
    r2 = sofiia_client.post(
        f"/api/chats/{chat_id}/send",
        json={"text": "ping", "idempotency_key": "k2"},
    )
    assert r1.status_code == 200 and r2.status_code == 200
    assert r1.json()["message"]["message_id"] != r2.json()["message"]["message_id"]