import asyncio
from types import SimpleNamespace
from unittest.mock import MagicMock, patch

from fastapi import FastAPI
from fastapi.testclient import TestClient

from app.gateway.routers import memory


def _sample_memory(facts: list[dict] | None = None) -> dict:
    return {
        "version": "1.0",
        "lastUpdated": "2026-03-26T12:00:00Z",
        "user": {
            "workContext": {"summary": "", "updatedAt": ""},
            "personalContext": {"summary": "", "updatedAt": ""},
            "topOfMind": {"summary": "", "updatedAt": ""},
        },
        "history": {
            "recentMonths": {"summary": "", "updatedAt": ""},
            "earlierContext": {"summary": "", "updatedAt": ""},
            "longTermBackground": {"summary": "", "updatedAt": ""},
        },
        "facts": facts or [],
    }


# ── export ─────────────────────────────────────────────────────────────────


def test_export_memory_route_returns_current_memory() -> None:
    app = FastAPI()
    app.include_router(memory.router)
    exported_memory = _sample_memory(facts=[{"id": "fact_export", "content": "User prefers concise responses.", "category": "preference", "confidence": 0.9, "createdAt": "2026-03-20T00:00:00Z", "source": "thread-1"}])

    mock_mgr = MagicMock()
    mock_mgr.get_memory.return_value = exported_memory
    with patch("app.gateway.routers.memory.get_memory_manager", return_value=mock_mgr):
        with TestClient(app) as client:
            response = client.get("/api/memory/export")
    assert response.status_code == 200
    assert response.json()["facts"] == exported_memory["facts"]


def test_export_memory_route_preserves_source_error() -> None:
    app = FastAPI()
    app.include_router(memory.router)
    exported_memory = _sample_memory(
        facts=[
            {
                "id": "fact_correction",
                "content": "Use make dev for local development.",
                "category": "correction",
                "confidence": 0.95,
                "createdAt": "2026-03-20T00:00:00Z",
                "source": "thread-1",
                "sourceError": "The agent previously suggested npm start.",
            }
        ]
    )

    mock_mgr = MagicMock()
    mock_mgr.get_memory.return_value = exported_memory
    with patch("app.gateway.routers.memory.get_memory_manager", return_value=mock_mgr):
        with TestClient(app) as client:
            response = client.get("/api/memory/export")
    assert response.status_code == 200
    assert response.json()["facts"][0]["sourceError"] == "The agent previously suggested npm start."


# ── import ─────────────────────────────────────────────────────────────────


def test_import_memory_route_returns_imported_memory() -> None:
    app = FastAPI()
    app.include_router(memory.router)
    imported_memory = _sample_memory(facts=[{"id": "fact_import", "content": "User works on DeerFlow.", "category": "context", "confidence": 0.87, "createdAt": "2026-03-20T00:00:00Z", "source": "manual"}])

    mock_mgr = MagicMock()
    mock_mgr.import_memory.return_value = imported_memory
    with patch("app.gateway.routers.memory.get_memory_manager", return_value=mock_mgr):
        with TestClient(app) as client:
            response = client.post("/api/memory/import", json=imported_memory)
    assert response.status_code == 200
    assert response.json()["facts"] == imported_memory["facts"]


def test_import_memory_route_preserves_source_error() -> None:
    app = FastAPI()
    app.include_router(memory.router)
    imported_memory = _sample_memory(
        facts=[
            {
                "id": "fact_correction",
                "content": "Use make dev for local development.",
                "category": "correction",
                "confidence": 0.95,
                "createdAt": "2026-03-20T00:00:00Z",
                "source": "thread-1",
                "sourceError": "The agent previously suggested npm start.",
            }
        ]
    )

    mock_mgr = MagicMock()
    mock_mgr.import_memory.return_value = imported_memory
    with patch("app.gateway.routers.memory.get_memory_manager", return_value=mock_mgr):
        with TestClient(app) as client:
            response = client.post("/api/memory/import", json=imported_memory)
    assert response.status_code == 200
    assert response.json()["facts"][0]["sourceError"] == "The agent previously suggested npm start."


# ── clear ──────────────────────────────────────────────────────────────────


def test_clear_memory_route_returns_cleared_memory() -> None:
    app = FastAPI()
    app.include_router(memory.router)
    mock_mgr = MagicMock()
    mock_mgr.clear_memory.return_value = _sample_memory()
    with patch("app.gateway.routers.memory.get_memory_manager", return_value=mock_mgr):
        with TestClient(app) as client:
            response = client.delete("/api/memory")
    assert response.status_code == 200
    assert response.json()["facts"] == []


# ── fact CRUD (normal / error) ─────────────────────────────────────────────


def test_create_memory_fact_route_returns_updated_memory() -> None:
    app = FastAPI()
    app.include_router(memory.router)
    updated_memory = _sample_memory(facts=[{"id": "fact_new", "content": "User prefers concise code reviews.", "category": "preference", "confidence": 0.88, "createdAt": "2026-03-20T00:00:00Z", "source": "manual"}])

    mock_mgr = MagicMock()
    mock_mgr.create_fact.return_value = (updated_memory, "fact_new")
    with patch("app.gateway.routers.memory.get_memory_manager", return_value=mock_mgr):
        with TestClient(app) as client:
            response = client.post("/api/memory/facts", json={"content": "User prefers concise code reviews.", "category": "preference", "confidence": 0.88})
    assert response.status_code == 200
    assert response.json()["facts"] == updated_memory["facts"]


def test_delete_memory_fact_route_returns_updated_memory() -> None:
    app = FastAPI()
    app.include_router(memory.router)
    updated_memory = _sample_memory(facts=[{"id": "fact_keep", "content": "User likes Python", "category": "preference", "confidence": 0.9, "createdAt": "2026-03-20T00:00:00Z", "source": "thread-1"}])

    mock_mgr = MagicMock()
    mock_mgr.delete_fact.return_value = updated_memory
    with patch("app.gateway.routers.memory.get_memory_manager", return_value=mock_mgr):
        with TestClient(app) as client:
            response = client.delete("/api/memory/facts/fact_delete")
    assert response.status_code == 200
    assert response.json()["facts"] == updated_memory["facts"]


def test_delete_memory_fact_route_returns_404_for_missing_fact() -> None:
    app = FastAPI()
    app.include_router(memory.router)
    mock_mgr = MagicMock()
    mock_mgr.delete_fact.side_effect = KeyError("fact_missing")
    with patch("app.gateway.routers.memory.get_memory_manager", return_value=mock_mgr):
        with TestClient(app) as client:
            response = client.delete("/api/memory/facts/fact_missing")
    assert response.status_code == 404
    assert response.json()["detail"] == "Memory fact 'fact_missing' not found."


def test_update_memory_fact_route_returns_updated_memory() -> None:
    app = FastAPI()
    app.include_router(memory.router)
    updated_memory = _sample_memory(facts=[{"id": "fact_edit", "content": "User prefers spaces", "category": "workflow", "confidence": 0.91, "createdAt": "2026-03-20T00:00:00Z", "source": "manual"}])

    mock_mgr = MagicMock()
    mock_mgr.update_fact.return_value = updated_memory
    with patch("app.gateway.routers.memory.get_memory_manager", return_value=mock_mgr):
        with TestClient(app) as client:
            response = client.patch("/api/memory/facts/fact_edit", json={"content": "User prefers spaces", "category": "workflow", "confidence": 0.91})
    assert response.status_code == 200
    assert response.json()["facts"] == updated_memory["facts"]


def test_update_memory_fact_route_preserves_omitted_fields() -> None:
    app = FastAPI()
    app.include_router(memory.router)
    updated_memory = _sample_memory(facts=[{"id": "fact_edit", "content": "User prefers spaces", "category": "preference", "confidence": 0.8, "createdAt": "2026-03-20T00:00:00Z", "source": "manual"}])

    mock_mgr = MagicMock()
    mock_mgr.update_fact.return_value = updated_memory
    with patch("app.gateway.routers.memory.get_memory_manager", return_value=mock_mgr):
        with TestClient(app) as client:
            response = client.patch("/api/memory/facts/fact_edit", json={"content": "User prefers spaces"})
    assert response.status_code == 200
    # The router calls _require_capability("update_fact") -> getattr(mgr, "update_fact")
    # which returns mock_mgr.update_fact (a MagicMock).  Then the call is
    #   update_fact(fact_id=..., content=..., category=..., confidence=..., user_id=...)
    mock_mgr.update_fact.assert_called_once()
    call_kwargs = mock_mgr.update_fact.call_args.kwargs
    assert call_kwargs.get("fact_id") == "fact_edit"
    assert call_kwargs.get("content") == "User prefers spaces"
    assert call_kwargs.get("category") is None
    assert call_kwargs.get("confidence") is None
    assert "user_id" in call_kwargs
    assert response.json()["facts"] == updated_memory["facts"]


def test_update_memory_fact_route_returns_404_for_missing_fact() -> None:
    app = FastAPI()
    app.include_router(memory.router)
    mock_mgr = MagicMock()
    mock_mgr.update_fact.side_effect = KeyError("fact_missing")
    with patch("app.gateway.routers.memory.get_memory_manager", return_value=mock_mgr):
        with TestClient(app) as client:
            response = client.patch("/api/memory/facts/fact_missing", json={"content": "User prefers spaces", "category": "workflow", "confidence": 0.91})
    assert response.status_code == 404
    assert response.json()["detail"] == "Memory fact 'fact_missing' not found."


def test_update_memory_fact_route_returns_specific_error_for_invalid_confidence() -> None:
    app = FastAPI()
    app.include_router(memory.router)
    mock_mgr = MagicMock()
    mock_mgr.update_fact.side_effect = ValueError("confidence")
    with patch("app.gateway.routers.memory.get_memory_manager", return_value=mock_mgr):
        with TestClient(app) as client:
            response = client.patch("/api/memory/facts/fact_edit", json={"content": "User prefers spaces", "confidence": 0.91})
    assert response.status_code == 400
    assert response.json()["detail"] == "Invalid confidence value; must be between 0 and 1."


# ── bound-owner (internal caller) ──────────────────────────────────────────


def _internal_owner_request(owner_user_id: str) -> SimpleNamespace:
    from app.gateway.internal_auth import INTERNAL_OWNER_USER_ID_HEADER_NAME, INTERNAL_SYSTEM_ROLE
    from deerflow.runtime.user_context import DEFAULT_USER_ID

    return SimpleNamespace(
        headers={INTERNAL_OWNER_USER_ID_HEADER_NAME: owner_user_id},
        state=SimpleNamespace(user=SimpleNamespace(id=DEFAULT_USER_ID, system_role=INTERNAL_SYSTEM_ROLE)),
    )


def test_get_memory_honors_bound_owner_header() -> None:
    seen: dict[str, str] = {}

    def fake_get_memory(*, user_id: str) -> dict:
        seen["user_id"] = user_id
        return _sample_memory(facts=[{"id": "f", "content": "owner fact", "category": "context", "confidence": 0.9, "createdAt": "", "source": "owner"}])

    mock_mgr = MagicMock()
    mock_mgr.get_memory.side_effect = fake_get_memory
    with patch("app.gateway.routers.memory.get_memory_manager", return_value=mock_mgr):
        response = asyncio.run(memory.get_memory(_internal_owner_request("owner-1")))
    assert seen["user_id"] == "owner-1"
    assert response.facts[0].content == "owner fact"


def test_get_memory_sanitizes_unsafe_owner_header() -> None:
    from deerflow.config.paths import make_safe_user_id

    raw_owner = "feishu|ou_AbC/123"
    seen: dict[str, str] = {}

    def fake_get_memory(*, user_id: str) -> dict:
        seen["user_id"] = user_id
        return _sample_memory()

    mock_mgr = MagicMock()
    mock_mgr.get_memory.side_effect = fake_get_memory
    with patch("app.gateway.routers.memory.get_memory_manager", return_value=mock_mgr):
        asyncio.run(memory.get_memory(_internal_owner_request(raw_owner)))
    expected = make_safe_user_id(raw_owner)
    assert seen["user_id"] == expected
    assert seen["user_id"] != raw_owner


def test_get_memory_falls_back_to_effective_user_for_browser_requests() -> None:
    from app.gateway.internal_auth import INTERNAL_OWNER_USER_ID_HEADER_NAME

    seen: dict[str, str] = {}

    def fake_get_memory(*, user_id: str) -> dict:
        seen["user_id"] = user_id
        return _sample_memory()

    browser_request = SimpleNamespace(
        headers={INTERNAL_OWNER_USER_ID_HEADER_NAME: "owner-1"},
        state=SimpleNamespace(user=SimpleNamespace(id="real-user", system_role="user")),
    )

    mock_mgr = MagicMock()
    mock_mgr.get_memory.side_effect = fake_get_memory
    with patch("app.gateway.routers.memory.get_memory_manager", return_value=mock_mgr):
        with patch("app.gateway.routers.memory.get_effective_user_id", return_value="real-user"):
            asyncio.run(memory.get_memory(browser_request))
    assert seen["user_id"] == "real-user"


def _browser_request_with_spoofed_owner_header() -> SimpleNamespace:
    from app.gateway.internal_auth import INTERNAL_OWNER_USER_ID_HEADER_NAME

    return SimpleNamespace(
        headers={INTERNAL_OWNER_USER_ID_HEADER_NAME: "owner-1"},
        state=SimpleNamespace(user=SimpleNamespace(id="real-user", system_role="user")),
    )


def test_clear_memory_scopes_destructive_write_to_bound_owner() -> None:
    seen: dict[str, str] = {}

    def fake_clear(*, user_id: str) -> dict:
        seen["user_id"] = user_id
        return _sample_memory()

    mock_mgr = MagicMock()
    mock_mgr.clear_memory.side_effect = fake_clear
    with patch("app.gateway.routers.memory.get_memory_manager", return_value=mock_mgr):
        asyncio.run(memory.clear_memory(_internal_owner_request("owner-1")))
        assert seen["user_id"] == "owner-1"

        with patch("app.gateway.routers.memory.get_effective_user_id", return_value="real-user"):
            asyncio.run(memory.clear_memory(_browser_request_with_spoofed_owner_header()))
        assert seen["user_id"] == "real-user"


def test_import_memory_scopes_overwrite_to_bound_owner() -> None:
    seen: dict[str, str] = {}
    payload = memory.MemoryResponse(**_sample_memory())

    def fake_import(_data: dict, *, user_id: str) -> dict:
        seen["user_id"] = user_id
        return _sample_memory()

    mock_mgr = MagicMock()
    mock_mgr.import_memory.side_effect = fake_import
    with patch("app.gateway.routers.memory.get_memory_manager", return_value=mock_mgr):
        asyncio.run(memory.import_memory(payload, _internal_owner_request("owner-1")))
        assert seen["user_id"] == "owner-1"

        with patch("app.gateway.routers.memory.get_effective_user_id", return_value="real-user"):
            asyncio.run(memory.import_memory(payload, _browser_request_with_spoofed_owner_header()))
        assert seen["user_id"] == "real-user"