"""
Unit tests pentru helperii din comanda_service (fără DB, fără mocks).

Acoperire:
  - _build_pc_nr: toate prefixele VFP (tip_id=1..7) + fallback pe tip_id necunoscut
  - _build_sir_id_operatii: None, empty, CSV, limit 4000 chars
"""
import pytest
from fastapi import HTTPException

from backend.modules.service_auto.services.comanda_service import (
    _build_pc_nr,
    _build_sir_id_operatii,
    _MAX_OPERATII_CSV,
    _PREFIX_MAP,
)


# ---- _build_pc_nr ----

@pytest.mark.parametrize("tip_id,expected_prefix", [
    (1, ""),     # POST GARANTIE — fără prefix (VFP default)
    (2, "G"),    # GARANTIE
    (3, "R"),    # REGIE
    (4, "P"),    # PREGATIRE
    (6, "PR"),   # PRODUCTIE
    (7, "C"),    # CONSTATARE
])
def test_pc_nr_known_tip_ids_use_vfp_prefix(tip_id, expected_prefix):
    """Toate cele 6 tip_id-uri cu prefix VFP verificat (oproceduri_devize.prg)."""
    nrord = _build_pc_nr(tip_id, 123, "B-32-CTL")
    assert nrord == f"{expected_prefix}123/B-32-CTL"


def test_pc_nr_tip_5_regie_2_no_vfp_mapping_uses_empty_prefix():
    """tip_id=5 (REGIE 2) nu are mapare VFP → fallback prefix ''."""
    assert _build_pc_nr(5, 42, "B-10-ABC") == "42/B-10-ABC"


def test_pc_nr_unknown_tip_id_uses_empty_prefix():
    """tip_id necunoscut (ex: 99) → fallback prefix '' + warning logat."""
    assert _build_pc_nr(99, 1, "XYZ") == "1/XYZ"


def test_pc_nr_format_matches_vfp_structure():
    """Format final: <prefix><seq>/<nrinmat> — nu '<prefix>/<seq>/<nrinmat>'."""
    nrord = _build_pc_nr(2, 777, "CT-10-EEE")
    assert nrord == "G777/CT-10-EEE"
    assert "/" in nrord
    assert nrord.count("/") == 1  # o singură bară


def test_prefix_map_covers_all_vfp_mappings():
    """Regression guard: _PREFIX_MAP nu trebuie scăpat la refactor."""
    assert _PREFIX_MAP == {1: "", 2: "G", 3: "R", 4: "P", 6: "PR", 7: "C"}


# ---- _build_sir_id_operatii ----

def test_sir_operatii_none_returns_none():
    """None → None (nu trimite param la SP)."""
    assert _build_sir_id_operatii(None) is None


def test_sir_operatii_empty_list_returns_none():
    """Listă goală → None (echivalent cu 'fără operații')."""
    assert _build_sir_id_operatii([]) is None


def test_sir_operatii_single_id():
    assert _build_sir_id_operatii([42]) == "42"


def test_sir_operatii_multiple_ids_csv():
    assert _build_sir_id_operatii([1, 2, 3]) == "1,2,3"


def test_sir_operatii_below_limit_passes():
    """600 ID-uri cu 2 cifre + virgulă = ~1800 chars, sub limita 4000."""
    ids = list(range(10, 110))  # 100 IDs, 3 cifre → ~400 chars
    result = _build_sir_id_operatii(ids)
    assert result is not None
    assert len(result) < _MAX_OPERATII_CSV


def test_sir_operatii_over_limit_raises_422():
    """~1000 IDs cu 6 cifre → peste 4000 chars → HTTPException 422."""
    big_ids = list(range(100000, 101000))  # 1000 IDs × 7 chars (6 cifre + virgulă) = 7000 chars
    with pytest.raises(HTTPException) as exc_info:
        _build_sir_id_operatii(big_ids)
    assert exc_info.value.status_code == 422
    assert "Prea multe" in exc_info.value.detail