"""Punkt 1: dasselbe Programm mit geänderten Daten neu rechnen – ohne LLM-Aufruf."""
import pytest

from core.model_schema import SolverStatus
from solving.solver_stage import run_solver_code

# Programm nach der Vorgabe des Solver-Prompts: alle Zahlen stehen in DATA
DATA_CODE = '''
from scipy.optimize import linprog

DATA = {
    "kosten": [3, 2],        # Kosten je Tonne [Tsd. €]
    "bedarf": 4,             # Mindestmenge [t]
    "obergrenze": 3,         # je Rohstoff lieferbar [t]
}


def solve_model():
    """Baut das LP aus DATA auf und löst es."""
    grenze = DATA["obergrenze"]
    return linprog(DATA["kosten"], A_ub=[[-1, -1]], b_ub=[-DATA["bedarf"]],
                   bounds=[(0, grenze), (0, grenze)], method="highs")


def main():
    """Löst das Modell und meldet Ergebnis samt Restriktionen."""
    res = solve_model()
    x, y = float(res.x[0]), float(res.x[1])
    report("optimal" if res.status == 0 else "error", float(res.fun), {"x": x, "y": y},
           constraints=[{"name": "Bedarf", "lhs": x + y, "sense": ">=", "rhs": DATA["bedarf"]}],
           variables=[{"name": "x", "value": x, "var_type": "continuous", "lb": 0, "ub": DATA["obergrenze"]}])


if __name__ == "__main__":
    main()
'''


def test_run_without_override_uses_own_data():
    run = run_solver_code(DATA_CODE)
    assert run.status == SolverStatus.OPTIMAL
    assert run.objective_value == pytest.approx(9)     # 1t * 3 + 3t * 2
    assert run.data["bedarf"] == 4


def test_changed_data_is_used_without_touching_the_code():
    run = run_solver_code(DATA_CODE, data={"bedarf": 5})
    assert run.status == SolverStatus.OPTIMAL
    assert run.objective_value == pytest.approx(12)    # 2t * 3 + 3t * 2
    assert run.data["bedarf"] == 5 and run.data["kosten"] == [3, 2]   # nur der geänderte Wert wird ersetzt


def test_constraints_follow_the_changed_data():
    run = run_solver_code(DATA_CODE, data={"bedarf": 5})
    assert run.constraints[0].rhs == 5


def test_infeasible_data_is_reported_not_crashing():
    run = run_solver_code(DATA_CODE, data={"bedarf": 99})
    assert run.status in (SolverStatus.ERROR, SolverStatus.INFEASIBLE)


# --- CLI-Modus: gespeichertes Ergebnis neu rechnen ---

def gespeichertes_ergebnis(tmp_path):
    import json
    from core.model_schema import PipelineResult, SolverCode
    from test_model_checks import make_spec
    from test_review import make_review
    result = PipelineResult(task="Aufgabe", specification=make_spec(), review=make_review(), revisions=0,
                            solver_code=SolverCode(code=DATA_CODE))
    pfad = tmp_path / "ergebnis.json"
    pfad.write_text(result.model_dump_json(indent=2), encoding="utf-8")
    return pfad


def test_resolve_without_data_reproduces_the_result(tmp_path):
    from TextToModel import resolve_result
    neu = resolve_result(str(gespeichertes_ergebnis(tmp_path)))
    assert neu.solver_run.objective_value == pytest.approx(9)
    assert neu.reliable and neu.usage is None          # kein LLM-Aufruf


def test_resolve_with_changed_data(tmp_path):
    import json
    from TextToModel import resolve_result
    daten = tmp_path / "daten.json"
    daten.write_text(json.dumps({"bedarf": 5}), encoding="utf-8")
    neu = resolve_result(str(gespeichertes_ergebnis(tmp_path)), str(daten))
    assert neu.solver_run.objective_value == pytest.approx(12)
    assert neu.solver_run.data["bedarf"] == 5


def test_resolve_keeps_specification_and_checks_feasibility(tmp_path):
    from TextToModel import resolve_result
    neu = resolve_result(str(gespeichertes_ergebnis(tmp_path)))
    assert neu.specification.problem_class.value.startswith("Linear")
    assert neu.solver_run.feasibility == []