from contextlib import contextmanager
import pytest
from fastapi import FastAPI, HTTPException
from fastapi.testclient import TestClient
from app.workflows import decisions


@pytest.fixture
def api(monkeypatch):
    app = FastAPI()
    app.include_router(decisions.router)
    app.dependency_overrides[decisions.edit_access] = lambda: {'id': 4, 'permissions': []}
    app.dependency_overrides[decisions.view_access] = lambda: {'id': 4}
    state = {'entry': {'id': 1, 'workflow_revision': 3, 'status': 'draft'},
             'previous': {'id': 2, 'status': 'decided', 'manual_override': True}, 'writes': []}
    class Cursor:
        def execute(self, sql, params=None):
            self.sql = sql
            if not sql.startswith('SELECT'):
                state['writes'].append(sql)
        def fetchone(self):
            if 'FROM tmodule_times' in self.sql:
                return state['entry']
            return state['previous']
        def fetchall(self):
            return []
    @contextmanager
    def transaction():
        yield Cursor()
    monkeypatch.setattr(decisions.service, 'transaction', transaction)
    return TestClient(app), state


def test_recalculate_preserves_manual_override_without_writes(api):
    client, state = api
    result = client.post('/timetracking/time/1/workflow-recalculate', json={})
    assert result.status_code == 200
    assert result.json()['preserved_override'] is True
    assert not state['writes']


def test_reset_requires_admin_permission(api):
    client, state = api
    result = client.post('/timetracking/time/1/workflow-recalculate', json={'reset_override': True, 'reason': 'Ny aftale'})
    assert result.status_code == 403
    assert not state['writes']


@pytest.mark.parametrize('field,value', [('status', 'approved'), ('status', 'billed'), ('economy_settled_at', 'now'), ('economy_order_draft_id', 24), ('exported_at', 'now')])
def test_settled_or_exported_cannot_recompute(api, field, value):
    client, state = api
    state['entry'][field] = value
    result = client.post('/timetracking/time/1/workflow-recalculate', json={})
    assert result.status_code == 409
    assert not state['writes']


def test_unauthenticated_cannot_override():
    app = FastAPI()
    app.include_router(decisions.router)
    response = TestClient(app).post('/timetracking/time/1/workflow-override', json={'method': 'invoice', 'reason': 'Ny aftale'})
    assert response.status_code == 401


def test_not_active_customer_rejected(monkeypatch):
    monkeypatch.setattr(decisions, 'active_for_customer', lambda _: False)
    with pytest.raises(HTTPException) as exc:
        decisions._require_active({'customer_id': '24'})
    assert exc.value.status_code == 409