from src.preferences import (
    append_preference,
    delete_preference,
    list_preferences,
    load_preferences,
)


def test_load_preferences_empty():
    assert load_preferences("user@oliver.agency") == ""


def test_append_and_list():
    pid1 = append_preference("user@oliver.agency", "Prefer concise answers")
    pid2 = append_preference("user@oliver.agency", "Always cite the data")
    rows = list_preferences("user@oliver.agency")
    assert [r["text"] for r in rows] == ["Prefer concise answers", "Always cite the data"]
    assert {r["id"] for r in rows} == {pid1, pid2}


def test_load_preferences_formats_as_bullets():
    append_preference("user@oliver.agency", "First")
    append_preference("user@oliver.agency", "Second")
    text = load_preferences("user@oliver.agency")
    assert "- First" in text
    assert "- Second" in text


def test_per_user_isolation():
    append_preference("alice@oliver.agency", "Alice's preference")
    append_preference("bob@oliver.agency", "Bob's preference")
    alice = list_preferences("alice@oliver.agency")
    bob = list_preferences("bob@oliver.agency")
    assert [r["text"] for r in alice] == ["Alice's preference"]
    assert [r["text"] for r in bob] == ["Bob's preference"]


def test_delete_preference():
    pid = append_preference("user@oliver.agency", "To be deleted")
    assert delete_preference("user@oliver.agency", pid) is True
    assert list_preferences("user@oliver.agency") == []


def test_delete_other_users_preference_fails():
    pid = append_preference("alice@oliver.agency", "Alice's secret")
    assert delete_preference("bob@oliver.agency", pid) is False
    # Still there
    assert len(list_preferences("alice@oliver.agency")) == 1


def test_load_preferences_no_user_returns_empty():
    assert load_preferences(None) == ""
    assert load_preferences("") == ""