from datetime import date

from app import db as d
from app.config import get_settings
from app.services import compute_service_due


def _conn():
    settings = get_settings()
    settings.data_dir.mkdir(parents=True, exist_ok=True)
    d.init_schema(settings.resolved_db_path)
    return d.connect(settings.resolved_db_path)


def _mk_bike(conn, interval):
    return d.create_bike(conn, "B", interval)


def _event(conn, bike_id, type, day, mileage, cost=None):
    d.create_event(conn, bike_id, type, day, mileage, cost, "n")


def test_no_data_when_no_service():
    conn = _conn()
    bike_id = _mk_bike(conn, 5000)
    _event(conn, bike_id, "tyre", date(2026, 1, 1), 10000)
    due = compute_service_due(conn, d.get_bike(conn, bike_id))
    assert due.status == "no-data"
    conn.close()


def test_ok_when_under_interval():
    conn = _conn()
    bike_id = _mk_bike(conn, 5000)
    _event(conn, bike_id, "service", date(2026, 1, 1), 10000)
    _event(conn, bike_id, "tyre", date(2026, 6, 1), 12000)
    due = compute_service_due(conn, d.get_bike(conn, bike_id))
    assert due.status == "ok"
    assert due.miles_since == 2000
    assert due.miles_until_due == 3000
    conn.close()


def test_overdue_when_over_interval():
    conn = _conn()
    bike_id = _mk_bike(conn, 5000)
    _event(conn, bike_id, "service", date(2026, 1, 1), 10000)
    _event(conn, bike_id, "other", date(2026, 6, 1), 16000)
    due = compute_service_due(conn, d.get_bike(conn, bike_id))
    assert due.status == "overdue"
    assert due.miles_since == 6000
    assert due.miles_until_due == -1000
    conn.close()


def test_exactly_at_interval_is_due_soon():
    conn = _conn()
    bike_id = _mk_bike(conn, 5000)
    _event(conn, bike_id, "service", date(2026, 1, 1), 10000)
    _event(conn, bike_id, "other", date(2026, 6, 1), 15000)
    due = compute_service_due(conn, d.get_bike(conn, bike_id))
    assert due.status == "due-soon"
    assert due.miles_until_due == 0
    conn.close()


def test_within_lead_time_is_due_soon():
    conn = _conn()
    bike_id = _mk_bike(conn, 5000)
    _event(conn, bike_id, "service", date(2026, 1, 1), 10000)
    _event(conn, bike_id, "other", date(2026, 6, 1), 14900)  # 100 mi left
    due = compute_service_due(conn, d.get_bike(conn, bike_id))
    assert due.status == "due-soon"
    assert due.miles_until_due == 100
    conn.close()


def test_just_outside_lead_time_is_ok():
    conn = _conn()
    bike_id = _mk_bike(conn, 5000)
    _event(conn, bike_id, "service", date(2026, 1, 1), 10000)
    _event(conn, bike_id, "other", date(2026, 6, 1), 14750)  # 250 mi left
    due = compute_service_due(conn, d.get_bike(conn, bike_id))
    assert due.status == "ok"
    assert due.miles_until_due == 250
    conn.close()


def test_no_interval_set_is_no_data():
    conn = _conn()
    bike_id = _mk_bike(conn, None)
    _event(conn, bike_id, "service", date(2026, 1, 1), 10000)
    due = compute_service_due(conn, d.get_bike(conn, bike_id))
    assert due.status == "no-data"
    conn.close()


def test_latest_service_used_not_earliest():
    conn = _conn()
    bike_id = _mk_bike(conn, 5000)
    _event(conn, bike_id, "service", date(2025, 1, 1), 8000)
    _event(conn, bike_id, "service", date(2026, 1, 1), 10000)  # most recent
    _event(conn, bike_id, "other", date(2026, 6, 1), 14000)
    due = compute_service_due(conn, d.get_bike(conn, bike_id))
    assert due.status == "ok"
    assert due.miles_since == 4000
    conn.close()


def test_service_without_mileage_is_ignored():
    conn = _conn()
    bike_id = _mk_bike(conn, 5000)
    _event(conn, bike_id, "service", date(2026, 1, 1), None)  # no mileage
    due = compute_service_due(conn, d.get_bike(conn, bike_id))
    assert due.status == "no-data"
    assert due.last_service is None
    conn.close()