from types import SimpleNamespace
from unittest.mock import AsyncMock
from uuid import uuid4

from fastapi import HTTPException
from fastapi.testclient import TestClient

from app.api.v1.endpoints import model_import
from app.auth.metadata_dependencies import (
    get_current_metadata_admin,
    get_metadata_repository,
)
from app.infra.db.metadb.repositories.metadata_repository import ProjectDbRouting
from app.infra.db.project_routing import get_project_pgconn_string
from tests.conftest import build_test_app


VALID_INP = b"[TITLE]\nDesktop model\n[JUNCTIONS]\n;ID Elev Demand\n"


def _client(*, admin=None, repo=None) -> TestClient:
    app = build_test_app(model_import.router, "/api/v1")
    if admin is not None:
        app.dependency_overrides[get_current_metadata_admin] = lambda: admin
    if repo is not None:
        app.dependency_overrides[get_metadata_repository] = lambda: repo
    return TestClient(app)


def test_system_admin_can_import_model_without_project_membership(
    monkeypatch,
):
    project_id = uuid4()
    project = SimpleNamespace(id=project_id, code="demo", status="active")
    repo = SimpleNamespace(
        session=object(),
        get_project_by_id=AsyncMock(return_value=project),
    )
    admin = SimpleNamespace(id=uuid4(), role="admin", is_superuser=False)
    monkeypatch.setattr(
        model_import,
        "_run_uploaded_inp",
        AsyncMock(return_value="imported"),
    )
    monkeypatch.setattr(model_import, "log_audit_event", AsyncMock())
    client = _client(admin=admin, repo=repo)

    response = client.post(
        f"/api/v1/admin/projects/{project_id}/model-imports",
        files={"file": ("desktop-model.inp", VALID_INP)},
    )

    assert response.status_code == 200
    assert response.json()["project_id"] == str(project_id)
    assert response.json()["result"] == "imported"
    repo.get_project_by_id.assert_awaited_once_with(project_id)
    model_import.log_audit_event.assert_awaited_once()


def test_non_admin_is_denied_model_import():
    def deny_admin():
        raise HTTPException(status_code=403, detail="Admin access required")

    app = build_test_app(model_import.router, "/api/v1")
    app.dependency_overrides[get_current_metadata_admin] = deny_admin
    client = TestClient(app)

    response = client.post(
        f"/api/v1/admin/projects/{uuid4()}/model-imports",
        files={"file": ("desktop-model.inp", VALID_INP)},
    )

    assert response.status_code == 403
    assert response.json()["detail"] == "Admin access required"


def test_model_import_rejects_non_inp_file(monkeypatch):
    project_id = uuid4()
    repo = SimpleNamespace(
        session=object(),
        get_project_by_id=AsyncMock(
            return_value=SimpleNamespace(
                id=project_id,
                code="demo",
                status="active",
            )
        ),
    )
    monkeypatch.setattr(model_import, "log_audit_event", AsyncMock())
    client = _client(
        admin=SimpleNamespace(id=uuid4(), role="admin", is_superuser=False),
        repo=repo,
    )

    response = client.post(
        f"/api/v1/admin/projects/{project_id}/model-imports",
        files={"file": ("desktop-model.txt", VALID_INP)},
    )

    assert response.status_code == 400
    assert response.json()["detail"] == "Only .inp model files are accepted"
    model_import.log_audit_event.assert_not_awaited()


def test_model_update_uses_project_business_routing(monkeypatch):
    project_id = uuid4()
    project = SimpleNamespace(id=project_id, code="demo", status="active")
    repo = SimpleNamespace(
        session=object(),
        get_project_by_id=AsyncMock(return_value=project),
        get_project_db_routing=AsyncMock(
            return_value=ProjectDbRouting(
                project_id=project_id,
                db_role="biz_data",
                db_type="postgresql",
                dsn="postgresql://user:password@biz.example/routed_business",
                pool_min_size=1,
                pool_max_size=5,
            )
        ),
    )
    captured: dict[str, str] = {}

    async def fake_apply_model_update(content: bytes, project_code: str) -> None:
        assert content == VALID_INP
        captured["project_code"] = project_code
        captured["dsn"] = get_project_pgconn_string(project_code)

    monkeypatch.setattr(model_import, "_apply_model_update", fake_apply_model_update)
    monkeypatch.setattr(model_import, "log_audit_event", AsyncMock())
    client = _client(
        admin=SimpleNamespace(id=uuid4(), role="admin", is_superuser=False),
        repo=repo,
    )

    response = client.patch(
        f"/api/v1/admin/projects/{project_id}/model-imports",
        files={"file": ("desktop-model.inp", VALID_INP)},
    )

    assert response.status_code == 200
    assert captured == {
        "project_code": "demo",
        "dsn": "postgresql://user:password@biz.example/routed_business",
    }
    repo.get_project_db_routing.assert_awaited_once_with(project_id, "biz_data")