"""CLI `TextToModel.main`: Optionen, Defaults, Ausgabe und Exit-Codes – ohne LLM."""
import json

import pytest

import TextToModel
from core import llm
from core.model_schema import PipelineResult
from solving import solver_stage
from test_resolve import gespeichertes_ergebnis


@pytest.fixture(autouse=True)
def einstellungen_zuruecksetzen(monkeypatch):
    # main() setzt Modulkonstanten; monkeypatch stellt sie nach jedem Test wieder her
    for modul, name in ((TextToModel, "UNDERSTAND_RETRIES"), (TextToModel, "INFEASIBLE_RECHECK"),
                        (llm, "REASONING_EFFORT"), (llm, "LLM_MAX_TOKENS"), (llm, "LLM_TIMEOUT"),
                        (solver_stage, "SOLVER_TIMEOUT"), (solver_stage, "SANDBOX")):
        monkeypatch.setattr(modul, name, getattr(modul, name))


def aufruffehler(argv, capsys) -> str:
    with pytest.raises(SystemExit) as exc:
        TextToModel.main(argv)
    assert exc.value.code == TextToModel.EXIT_USAGE   # nicht 2 – das hieße „unzuverlässig“
    return capsys.readouterr().err


def test_resolve_writes_json_report_and_code_with_prefix(tmp_path):
    ergebnis = gespeichertes_ergebnis(tmp_path)
    praefix = tmp_path / "neu" / "lauf"            # Ordner existiert noch nicht
    assert TextToModel.main(["--resolve", str(ergebnis), "-a", str(praefix)]) == TextToModel.EXIT_OK
    neu = PipelineResult.model_validate_json((tmp_path / "neu" / "lauf.json").read_text(encoding="utf-8"))
    assert neu.solver_run.objective_value == pytest.approx(9)
    assert (tmp_path / "neu" / "lauf.html").exists() and (tmp_path / "neu" / "lauf.py").exists()


def test_explicit_output_wins_over_prefix(tmp_path):
    ergebnis = gespeichertes_ergebnis(tmp_path)
    TextToModel.main(["--resolve", str(ergebnis), "-a", str(tmp_path / "p"), "--report", str(tmp_path / "r.md")])
    assert (tmp_path / "r.md").exists() and not (tmp_path / "p.html").exists()


def test_json_goes_to_redirected_stdout(tmp_path, capsys):
    ergebnis = gespeichertes_ergebnis(tmp_path)
    daten = tmp_path / "daten.json"
    daten.write_text(json.dumps({"bedarf": 5}), encoding="utf-8")
    assert TextToModel.main(["--resolve", str(ergebnis), "--data", str(daten)]) == TextToModel.EXIT_OK
    assert json.loads(capsys.readouterr().out)["solver_run"]["objective_value"] == pytest.approx(12)


def test_terminal_gets_a_summary_instead_of_json(tmp_path, capsys, monkeypatch):
    monkeypatch.setattr("sys.stdout.isatty", lambda: True)
    TextToModel.main(["--resolve", str(gespeichertes_ergebnis(tmp_path))])
    out = capsys.readouterr().out
    assert "Zielwert: 9" in out and "Zuverlässig." in out and not out.lstrip().startswith("{")


def test_unreliable_result_exits_with_2(tmp_path):
    daten = tmp_path / "daten.json"
    daten.write_text(json.dumps({"kosten": "keine Zahl"}), encoding="utf-8")
    code = TextToModel.main(["--resolve", str(gespeichertes_ergebnis(tmp_path)), "--data", str(daten),
                             "-o", str(tmp_path / "x.json")])
    assert code == TextToModel.EXIT_UNRELIABLE


def test_broken_result_file_is_an_error_not_a_traceback(tmp_path):
    kaputt = tmp_path / "kaputt.json"
    kaputt.write_text("{}", encoding="utf-8")
    assert TextToModel.main(["--resolve", str(kaputt)]) == TextToModel.EXIT_ERROR


@pytest.mark.parametrize("argv, meldung", [
    (["--data", "d.json"], "--data wirkt nur"),
    (["a.txt", "--report", "r.pdf"], "Endung"),
    (["a.txt", "--no-solve", "--code", "c.py"], "--no-solve"),
    (["--von", "extraktion", "e.json"], "Stufe"),
    (["--von", "solver", "e.json", "--no-solve"], "not allowed"),
    (["--max-revisions", "-1"], "negativ"),
    (["--solver-timeout", "0"], "positiv"),
    (["fehlt.txt"], "Datei nicht gefunden"),
])
def test_wrong_calls_are_usage_errors(argv, meldung, capsys):
    assert meldung in aufruffehler(argv, capsys)


def test_task_file_with_resolve_is_rejected(tmp_path, capsys):
    ergebnis = gespeichertes_ergebnis(tmp_path)
    assert "keine Aufgabendatei" in aufruffehler([str(ergebnis), "--resolve", str(ergebnis)], capsys)


def test_options_reach_pipeline_and_modules(tmp_path, monkeypatch):
    aufgabe = tmp_path / "aufgabe.md"
    aufgabe.write_text("Maximiere x unter x ≤ 3.", encoding="utf-8")
    gesehen = {}

    def fake_pipeline(task, **kwargs):
        gesehen.update(kwargs, task=task)
        return PipelineResult(task=task, rejected=True, reliable=False, reliability_issues=["keine Aufgabe"])

    monkeypatch.setattr(TextToModel, "run_pipeline", fake_pipeline)
    code = TextToModel.main([str(aufgabe), "-m", "x/y", "--max-revisions", "0", "--solver-retries", "4",
                             "--max-restarts", "0", "--understand-retries", "-1", "--infeasible-recheck", "0",
                             "--reasoning", "low", "--max-tokens", "1000", "--llm-timeout", "30",
                             "--solver-timeout", "90", "--sandbox", "bwrap", "-o", str(tmp_path / "e.json")])
    assert code == TextToModel.EXIT_REJECTED
    assert gesehen["task"].startswith("Maximiere") and gesehen["task_dir"] == tmp_path
    assert (gesehen["model"], gesehen["max_revisions"], gesehen["solver_retries"], gesehen["max_restarts"]) \
        == ("x/y", 0, 4, 0)
    assert gesehen["solve_model"] is True
    assert (TextToModel.UNDERSTAND_RETRIES, TextToModel.INFEASIBLE_RECHECK) == (-1, 0)
    assert (llm.REASONING_EFFORT, llm.LLM_MAX_TOKENS, llm.LLM_TIMEOUT) == ("low", 1000, 30)
    assert (solver_stage.SOLVER_TIMEOUT, solver_stage.SANDBOX) == (90, "bwrap")
    assert "90" in solver_stage.solver_prompt()     # Zeitbudget im Prompt folgt der Option


def test_without_options_the_defaults_stay(tmp_path, monkeypatch):
    vorher = (llm.LLM_MAX_TOKENS, solver_stage.SOLVER_TIMEOUT, solver_stage.SANDBOX, TextToModel.UNDERSTAND_RETRIES)
    monkeypatch.setattr(TextToModel, "run_pipeline", lambda task, **kw: PipelineResult(task=task, reliable=True))
    aufgabe = tmp_path / "a.txt"
    aufgabe.write_text("Minimiere x.", encoding="utf-8")
    TextToModel.main([str(aufgabe), "-o", str(tmp_path / "e.json")])
    assert (llm.LLM_MAX_TOKENS, solver_stage.SOLVER_TIMEOUT, solver_stage.SANDBOX,
            TextToModel.UNDERSTAND_RETRIES) == vorher