"""Shared test fixtures for pyngspice tests."""

import os
import sys
import tempfile

import pytest

# Ensure repo root is on path for editable installs
sys.path.insert(0, os.path.dirname(os.path.dirname(os.path.abspath(__file__))))


@pytest.fixture
def tmp_workdir():
    """Provide a temporary working directory, cleaned up after the test."""
    with tempfile.TemporaryDirectory() as d:
        yield d


@pytest.fixture
def rc_netlist(tmp_workdir):
    """Write a simple RC circuit netlist and return its path."""
    path = os.path.join(tmp_workdir, "rc.cir")
    with open(path, "w") as f:
        f.write("""RC Test Circuit
V1 in 0 DC 1
R1 in out 1k
C1 out 0 1u
.tran 0.1m 10m
.end
""")
    return path


@pytest.fixture
def inductor_rser_netlist(tmp_workdir):
    """Write a netlist with LTspice-style Rser= on inductors."""
    path = os.path.join(tmp_workdir, "inductor_rser.cir")
    with open(path, "w") as f:
        f.write("""Tesla Coil Primary
V1 drive 0 SIN(0 100 250000)
L1 drive tank 8.5u Rser=0.012
C1 tank 0 100n
L2 tank sec 500u Rser=2.5
R_load sec 0 50
.tran 0.1u 100u
.backanno
.end
""")
    return path


@pytest.fixture
def tesla_coil_netlist(tmp_workdir):
    """Write a Tesla coil netlist with .options savecurrents and Rser=."""
    path = os.path.join(tmp_workdir, "tesla_coil.cir")
    with open(path, "w") as f:
        f.write("""Tesla Coil AC Analysis
V1 vin 0 AC 1
C_mmc vin p1 0.03u
L1 p1 0 10.927u Rser=0.001
L2 0 top 15.987m Rser=0.001
C_topload top 0 13.822p
K1 L1 L2 0.3204
.options savecurrents
.ac dec 100 1k 3meg
.end
""")
    return path