import pytest
from rota.shifts import RotaBuilder, SingleShift, days
from rota.workers import Worker
import datetime

@pytest.fixture
def demo_rota_clear():
    weeks_to_rota = 10
    start_date = datetime.date(2022, 3, 7)

    Rota = RotaBuilder(
        start_date,
        weeks_to_rota=weeks_to_rota,
        balance_offset_modifier=1,
    )
    Rota.constraint_options["max_shifts_per_month"] = 20

    workers = [
        Worker(name="worker1", site="group1", grade=1),
        Worker(name="worker2", site="group1", grade=1),
        Worker(name="worker3", site="group1", grade=1),
        Worker(name="worker4", site="group1", grade=1),
        Worker(name="worker5", site="group2", grade=1, fte=60),
        Worker(name="worker6", site="group2", grade=1, fte=40),
        Worker(name="worker7", site="group2", grade=1),
        Worker(name="worker8", site="group2", grade=1),
    ]
    Rota.add_workers(workers)
    return Rota

def test_pre(demo_rota_clear):
    Rota = demo_rota_clear
    Rota.add_shifts(
        SingleShift(
            sites=("group1", "group2"),
            name="a",
            length=12.5,
            days=days[:5],
            workers_required=2,
            constraint=[{"name": "pre", "options": 1}],
        ),
        SingleShift(
            sites=("group1", "group2"),
            name="b",
            length=12.5,
            days=days[:5],
            workers_required=2,
        ),
        SingleShift(
            sites=("group1", "group2"),
            name="c",
            length=12.5,
            days=days[3],
            workers_required=1,
            constraint=[{"name": "pre", "options": 1}, {"name": "post", "options": 1}],
        ),
    )

    Rota.build_shifts()
    Rota.build_workers()
    Rota.build_model()

    solver_options = {"seconds": 1000, "threads": 10}
    Rota.solve_model(options=solver_options)
    Rota.export_rota_to_html("test4")

    assert Rota.results.solver.status == "ok"
    assert Rota.results.solver.termination_condition == "optimal"

    for worker in Rota.workers:
        shifts = Rota.get_worker_shift_list(worker)
        shifts_string = "".join([i if i != "" else "-" for i in shifts])

        # check for patterns that should not occur
        assert "ba" not in shifts_string
        assert "ca" not in shifts_string
        assert "ac" not in shifts_string
        assert "ca" not in shifts_string
        assert "bc" not in shifts_string
        assert "cb" not in shifts_string
        # Uncomment if you want to check for these as well:
        # assert "a-c" not in shifts_string
        # assert "c-a" not in shifts_string
        # assert "b-c" not in shifts_string
        # assert "c-b" not in shifts_string