from services.control.exporter_monolith import (
    REG178_PASSIVE,
    _drop_registers_matching_last_verified,
)


def test_drop_registers_skips_reg178_when_mask_matches():
    # last_verified contains extra bits beyond 0x0030; we still want to skip if bits 4–5 match.
    registers = [(178, "grid_peak_shaving_switch", REG178_PASSIVE)]
    last_verified = {178: 12030}  # real-world example from home-01 (bits4-5 still == 0b11)
    out, skipped = _drop_registers_matching_last_verified(registers, last_verified)
    assert out == []
    assert skipped == [178]


def test_drop_registers_keeps_reg178_when_mask_differs():
    registers = [(178, "grid_peak_shaving_switch", REG178_PASSIVE)]
    last_verified = {178: 32}  # SELL mask 0b10
    out, skipped = _drop_registers_matching_last_verified(registers, last_verified)
    assert out == registers
    assert skipped == []


def test_drop_registers_keeps_reg179_when_mask_matches_but_not_clean():
    registers = [(179, "control_board_special_1", 2)]  # want cutoff ON (clean value)
    last_verified = {179: 0x1236}  # bits0–1 still == 2, but not a clean 2/3 value
    out, skipped = _drop_registers_matching_last_verified(registers, last_verified)
    assert out == registers
    assert skipped == []


def test_drop_registers_skips_reg179_when_clean_value_matches():
    registers = [(179, "control_board_special_1", 2)]  # want cutoff ON (clean value)
    last_verified = {179: 2}  # already clean cutoff ON
    out, skipped = _drop_registers_matching_last_verified(registers, last_verified)
    assert out == []
    assert skipped == [179]


def test_drop_registers_keeps_reg179_when_mask_differs():
    registers = [(179, "control_board_special_1", 2)]  # want cutoff ON
    last_verified = {179: 0x1237}  # ...0111b => bits0–1 == 3 (cutoff OFF)
    out, skipped = _drop_registers_matching_last_verified(registers, last_verified)
    assert out == registers
    assert skipped == []