from app.layouts import load_layout, validate_layout


def _layout(page, main_components, sidebar=None):
    return {
        "schemaVersion": 1,
        "page": page,
        "regions": {
            "sidebar": sidebar or ([{"component": "task-list"}] if page == "task-detail" else []),
            "main": main_components,
        },
    }


def test_valid_home_layout():
    assert validate_layout(_layout("home", [{"component": "overview-summary"}, {"component": "task-progress-grid"}]), "home")


def test_valid_task_detail_layout():
    assert validate_layout(_layout("task-detail", [{"component": "task-header"}, {"component": "today-record"}, {"component": "metric-progress"}, {"component": "activity-heatmap"}, {"component": "task-settings"}]), "task-detail")


def test_rejects_component_on_wrong_page():
    assert not validate_layout(_layout("home", [{"component": "today-record"}]), "home")


def test_rejects_component_in_wrong_region():
    layout = _layout("task-detail", [{"component": "task-header"}], sidebar=[{"component": "task-header"}])
    assert not validate_layout(layout, "task-detail")


def test_rejects_duplicate_component():
    layout = _layout("task-detail", [{"component": "today-record"}, {"component": "today-record"}])
    assert not validate_layout(layout, "task-detail")


def test_load_layout_falls_back_on_invalid(tmp_path):
    import json
    bad = tmp_path / "home.json"
    bad.write_text(json.dumps(_layout("home", [{"component": "today-record"}])), encoding="utf-8")
    loaded = load_layout(tmp_path, "home")
    assert loaded["regions"]["main"] != [{"component": "today-record"}]