"""Shared pytest fixtures for SystemMonitor tests."""

import os
import sys
import tempfile
from pathlib import Path
from unittest.mock import patch

import pytest

# ---------------------------------------------------------------------------
# Ensure project root is on sys.path
# ---------------------------------------------------------------------------

PROJECT_ROOT = str(Path(__file__).resolve().parent.parent)
if PROJECT_ROOT not in sys.path:
    sys.path.insert(0, PROJECT_ROOT)


@pytest.fixture
def project_root():
    """Return the project root directory and ensure it is on sys.path."""
    return PROJECT_ROOT


@pytest.fixture
def tmp_dir(tmp_path):
    """Provide a temporary directory for test artifacts."""
    return str(tmp_path)


@pytest.fixture
def mock_config():
    """Return a valid SystemMonitor config dict (no YAML file needed)."""
    return {
        "device": {
            "platform": "generic",
            "hostname": "test-device",
            "install_path": "/tmp/bb-test",
        },
        "network": {
            "primary_interface": "eth0",
            "scope_enforcement": False,
        },
        "connectivity": {
            "primary": "wireguard",
        },
        "security": {
            "encryption": "aes-256-gcm",
            "encryption_key_derive": "argon2id",
            "kill_switch_enabled": True,
        },
        "capture": {
            "interface": "eth0",
            "snap_length": 65535,
            "pcap_rotation_hours": 1,
            "pcap_compression": "zstd",
            "pcap_compression_level": 19,
        },
        "stealth": {
            "mac_profile": "auto",
            "process_disguise": True,
            "log_suppression": True,
        },
        "engagement_phase": {
            "mode": "passive_only",
            "passive_days": 7,
        },
        "bettercap": {
            "binary": "/usr/local/bin/bettercap",
            "api_address": "127.0.0.1",
            "api_port": 8083,
        },
        "storage_path": "/tmp/bb-test/storage",
    }


@pytest.fixture
def mock_bus():
    """Return a started EventBus instance. Stopped after test."""
    from core.bus import EventBus

    bus = EventBus()
    bus.start()
    yield bus
    bus.stop()


@pytest.fixture
def mock_state(tmp_path):
    """Return a StateManager backed by a temp SQLite database. Stopped after test."""
    from core.state import StateManager

    db_path = str(tmp_path / "test_state.db")
    state = StateManager(db_path=db_path)
    state.start()
    yield state
    state.stop()


@pytest.fixture
def hardware_tier_override():
    """Context manager fixture to patch detect_hardware_tier to return a specific tier.

    Usage:
        def test_foo(hardware_tier_override):
            with hardware_tier_override("pi_zero"):
                ...
    """
    from contextlib import contextmanager

    @contextmanager
    def _override(tier: str):
        with patch("core.engine.detect_hardware_tier", return_value=tier):
            yield

    return _override