"""
Shared fixtures for live integration tests.

Configure with environment variables:
  PIC_HOST        API host (default: localhost)
  PIC_API_PORT    API port (default: 3000)
  PIC_WEBUI_PORT  WebUI port (default: 80)
  PIC_WG_CONTAINER  WireGuard container name (default: cell-wireguard)
"""
import os
import json
import subprocess
import pytest
import requests

PIC_HOST = os.environ.get('PIC_HOST', 'localhost')
API_PORT = int(os.environ.get('PIC_API_PORT', '3000'))
WEBUI_PORT = int(os.environ.get('PIC_WEBUI_PORT', '80'))
WG_CONTAINER = os.environ.get('PIC_WG_CONTAINER', 'cell-wireguard')

API_BASE = f"http://{PIC_HOST}:{API_PORT}"
WEBUI_BASE = f"http://{PIC_HOST}:{WEBUI_PORT}"

TEST_PEERS = (
    'integration-test-full',
    'integration-test-restricted',
    'integration-test-none',
    'bad-svc-peer',  # guard against validation-test leak
)


@pytest.fixture(scope='session')
def api():
    s = requests.Session()
    s.headers['Content-Type'] = 'application/json'
    return s


@pytest.fixture(scope='session')
def api_base():
    return API_BASE


@pytest.fixture(scope='session')
def webui_base():
    return WEBUI_BASE


@pytest.fixture(scope='session', autouse=True)
def cleanup_test_peers(api):
    """Delete any leftover test peers before and after the entire session."""
    for name in TEST_PEERS:
        api.delete(f"{API_BASE}/api/peers/{name}")
    yield
    for name in TEST_PEERS:
        api.delete(f"{API_BASE}/api/peers/{name}")


def iptables_forward() -> str:
    """Return iptables-save output from the WireGuard container."""
    result = subprocess.run(
        ['docker', 'exec', WG_CONTAINER, 'iptables-save'],
        capture_output=True, text=True, timeout=10,
    )
    return result.stdout


def peer_rules(peer_ip: str) -> list[str]:
    """Return FORWARD rule lines for a specific peer IP."""
    comment = f'pic-peer-{peer_ip.replace(".", "-")}'
    return [line for line in iptables_forward().splitlines() if comment in line]


def get_live_service_vips() -> dict:
    """
    Read virtual IPs from the config API.

    The config API computes service_ips from the current ip_range at request time,
    so it always matches what the running firewall_manager will use when applying
    peer rules.  Using docker exec on the API container is NOT reliable because
    it spawns a fresh Python process that imports firewall_manager with its initial
    hardcoded SERVICE_IPS, ignoring any update_service_ips() calls made at runtime.
    """
    cfg = requests.get(f"{API_BASE}/api/config").json()
    sips = cfg.get('service_ips', {})
    return {
        'calendar': sips.get('vip_calendar', ''),
        'files':    sips.get('vip_files', ''),
        'mail':     sips.get('vip_mail', ''),
        'webdav':   sips.get('vip_webdav', ''),
    }