"""
Negative and error-path integration tests.

These tests verify that the API:
  1. Rejects malformed or missing inputs with appropriate 4xx status codes
  2. Returns JSON with an 'error' key on failure (never a raw exception traceback)
  3. Returns 404 (or a 200 with a "not found" message) for unknown resource IDs
  4. Does not crash (500) on bad Content-Type or oversized payloads

Endpoints covered:
  - /api/peers        (POST, PUT, DELETE)
  - /api/config       (PUT)
  - /api/dns/records  (DELETE)
  - /api/dhcp/reservations (POST, DELETE)
  - /api/containers/<name>/restart
  - /api/wireguard/keys/peer

Run with:  pytest tests/integration/test_negative_scenarios.py -v
"""
import pytest
import requests
import sys
import os
sys.path.insert(0, os.path.dirname(__file__))
from conftest import API_BASE

# Sentinel peer name that should never exist in the registry
_GHOST_PEER = 'ghost-peer-that-does-not-exist-xyz'
_GHOST_CONTAINER = 'cell-container-does-not-exist-xyz'


def get(path, **kw):
    return requests.get(f"{API_BASE}{path}", **kw)


def post(path, **kw):
    return requests.post(f"{API_BASE}{path}", **kw)


def put(path, **kw):
    return requests.put(f"{API_BASE}{path}", **kw)


def delete(path, **kw):
    return requests.delete(f"{API_BASE}{path}", **kw)


# ---------------------------------------------------------------------------
# Helpers
# ---------------------------------------------------------------------------

def _assert_error_response(r, expected_status):
    """Assert status code and that the body is valid JSON containing 'error'."""
    assert r.status_code == expected_status, (
        f"Expected {expected_status}, got {r.status_code}: {r.text}"
    )
    data = r.json()
    assert 'error' in data, f"Expected 'error' key in response body: {data}"


def _assert_json_error(r):
    """Assert that whatever the status code, the body is JSON and has 'error'."""
    body = r.json()
    assert 'error' in body, f"Expected 'error' key in error response body: {body}"


# ---------------------------------------------------------------------------
# Peer endpoints — missing / invalid fields
# ---------------------------------------------------------------------------

class TestPeerNegative:
    def test_create_peer_missing_name_returns_400(self):
        r = post('/api/peers', json={'public_key': 'somefakekey=='})
        _assert_error_response(r, 400)

    def test_create_peer_missing_public_key_returns_400(self):
        r = post('/api/peers', json={'name': _GHOST_PEER})
        _assert_error_response(r, 400)

    def test_create_peer_empty_body_returns_400(self):
        r = requests.post(
            f"{API_BASE}/api/peers",
            data='',
            headers={'Content-Type': 'application/json'},
        )
        assert r.status_code == 400

    def test_create_peer_invalid_service_access_returns_400(self):
        r = post('/api/peers', json={
            'name': _GHOST_PEER,
            'public_key': 'somefakekey==',
            'service_access': ['not_a_real_service'],
        })
        _assert_error_response(r, 400)

    def test_create_peer_service_access_not_a_list_returns_400(self):
        r = post('/api/peers', json={
            'name': _GHOST_PEER,
            'public_key': 'somefakekey==',
            'service_access': 'calendar',  # string instead of list
        })
        _assert_error_response(r, 400)

    def test_update_nonexistent_peer_returns_404(self):
        r = put(f'/api/peers/{_GHOST_PEER}', json={'service_access': ['calendar']})
        assert r.status_code == 404
        _assert_json_error(r)

    def test_delete_nonexistent_peer_returns_200_with_message(self):
        # app.py returns 200 + a "not found" message (not 404) for idempotent deletes
        r = delete(f'/api/peers/{_GHOST_PEER}')
        assert r.status_code == 200
        data = r.json()
        # Should have 'message', not 'error'
        assert 'message' in data
        assert 'not found' in data['message'].lower() or 'removed' in data['message'].lower()

    def test_create_peer_plain_text_body_returns_400(self):
        """Sending plain text instead of JSON should produce a 400."""
        r = requests.post(
            f"{API_BASE}/api/peers",
            data='name=foo&public_key=bar',
            headers={'Content-Type': 'text/plain'},
        )
        assert r.status_code == 400


# ---------------------------------------------------------------------------
# Config endpoint — bad JSON, bad values
# ---------------------------------------------------------------------------

class TestConfigNegative:
    def test_put_config_null_body_returns_400(self):
        r = requests.put(
            f"{API_BASE}/api/config",
            data='null',
            headers={'Content-Type': 'application/json'},
        )
        assert r.status_code == 400

    def test_put_config_completely_invalid_json_returns_400(self):
        r = requests.put(
            f"{API_BASE}/api/config",
            data='{bad json}}}',
            headers={'Content-Type': 'application/json'},
        )
        assert r.status_code == 400

    def test_put_config_ip_range_public_address_returns_400(self):
        r = put('/api/config', json={'ip_range': '203.0.113.0/24'})
        assert r.status_code == 400
        _assert_json_error(r)

    def test_put_config_ip_range_172_boundary_just_below_rejected(self):
        # 172.15.0.0/24 is just below 172.16.0.0/12 — must be rejected
        r = put('/api/config', json={'ip_range': '172.15.0.0/24'})
        assert r.status_code == 400

    def test_put_config_ip_range_172_boundary_just_inside_accepted(self):
        # 172.16.0.0/24 is within 172.16.0.0/12 — must be accepted
        current = get('/api/config').json()
        current_range = current['ip_range']
        try:
            r = put('/api/config', json={'ip_range': '172.16.0.0/24'})
            assert r.status_code == 200, (
                f"172.16.0.0/24 is valid RFC-1918 but was rejected: {r.text}"
            )
        finally:
            put('/api/config', json={'ip_range': current_range})

    def test_put_config_port_string_value_returns_400(self):
        r = put('/api/config', json={'calendar': {'port': 'not-a-number'}})
        assert r.status_code == 400

    def test_put_config_port_boundary_65535_accepted(self):
        # 65535 is the maximum valid port — must not return 400
        # Use a port field that is unlikely to conflict with existing ports
        # We test the validation boundary only; we do not actually apply this
        # port because that would require a container restart.
        # NOTE: this may conflict with another service's port; accept 409 too.
        r = put('/api/config', json={'calendar': {'port': 65535}})
        assert r.status_code in (200, 409), (
            f"Expected 200 or 409 for port=65535, got {r.status_code}: {r.text}"
        )

    def test_put_config_port_boundary_1_accepted(self):
        r = put('/api/config', json={'calendar': {'port': 1}})
        assert r.status_code in (200, 409), (
            f"Expected 200 or 409 for port=1, got {r.status_code}: {r.text}"
        )

    def test_put_config_wireguard_address_bare_ip_returns_400(self):
        r = put('/api/config', json={'wireguard': {'address': '10.0.0.1'}})
        assert r.status_code == 400

    def test_put_config_oversized_cell_name_does_not_crash(self):
        """A very long cell_name should not cause an unhandled 500."""
        long_name = 'a' * 2048
        r = put('/api/config', json={'cell_name': long_name})
        # We don't mandate 400 here (the API may accept it), but it must not 500.
        assert r.status_code != 500, (
            f"Oversized cell_name caused a 500: {r.text}"
        )
        r.json()  # must be valid JSON


# ---------------------------------------------------------------------------
# DNS records — negative
# ---------------------------------------------------------------------------

class TestDnsRecordsNegative:
    def test_delete_dns_record_empty_body_does_not_crash(self):
        """Sending an empty JSON body to DELETE /api/dns/records must not 500."""
        r = requests.delete(
            f"{API_BASE}/api/dns/records",
            json={},
            headers={'Content-Type': 'application/json'},
        )
        # The endpoint calls network_manager.remove_dns_record(**{}) which will
        # raise a TypeError; the API should catch it and return a 500 OR a 400.
        assert r.status_code in (400, 500)
        r.json()  # must still be parseable JSON

    def test_delete_dns_record_no_content_type_does_not_crash(self):
        """Sending DELETE with no body at all must return a parseable response."""
        r = requests.delete(f"{API_BASE}/api/dns/records")
        assert r.status_code in (200, 400, 404, 500)
        r.json()


# ---------------------------------------------------------------------------
# DHCP reservations — negative
# ---------------------------------------------------------------------------

class TestDhcpReservationsNegative:
    def test_add_reservation_no_body_returns_400(self):
        r = requests.post(
            f"{API_BASE}/api/dhcp/reservations",
            data='',
            headers={'Content-Type': 'application/json'},
        )
        assert r.status_code == 400

    def test_add_reservation_missing_ip_returns_400(self):
        r = post('/api/dhcp/reservations', json={'mac': 'aa:bb:cc:dd:ee:ff'})
        assert r.status_code == 400
        _assert_json_error(r)

    def test_add_reservation_missing_mac_returns_400(self):
        r = post('/api/dhcp/reservations', json={'ip': '10.0.0.250'})
        assert r.status_code == 400
        _assert_json_error(r)

    def test_delete_reservation_no_mac_returns_400(self):
        r = delete('/api/dhcp/reservations', json={'ip': '10.0.0.250'})
        assert r.status_code == 400
        _assert_json_error(r)

    def test_delete_reservation_empty_body_returns_400(self):
        r = requests.delete(
            f"{API_BASE}/api/dhcp/reservations",
            data='',
            headers={'Content-Type': 'application/json'},
        )
        assert r.status_code == 400


# ---------------------------------------------------------------------------
# Container endpoints — negative
# ---------------------------------------------------------------------------

class TestContainersNegative:
    def test_restart_nonexistent_container_returns_error(self):
        r = post(f'/api/containers/{_GHOST_CONTAINER}/restart')
        # 403 = local-only endpoint; 404/500 = not found; 200 with restarted=False = ok
        assert r.status_code in (200, 403, 404, 500)
        if r.status_code == 200:
            assert r.json().get('restarted') is not True
        r.json()  # must be valid JSON

    def test_get_logs_nonexistent_container_returns_error(self):
        r = get(f'/api/containers/{_GHOST_CONTAINER}/logs')
        assert r.status_code in (200, 403, 404, 500)
        if r.status_code == 200:
            data = r.json()
            assert 'error' in data or not data.get('logs')
        r.json()

    def test_get_stats_nonexistent_container_returns_json(self):
        r = get(f'/api/containers/{_GHOST_CONTAINER}/stats')
        assert r.status_code in (200, 403, 404, 500)
        r.json()  # must always be parseable


# ---------------------------------------------------------------------------
# WireGuard key generation — negative
# ---------------------------------------------------------------------------

class TestWireGuardKeyGenNegative:
    def test_generate_keys_empty_body_returns_400(self):
        r = requests.post(
            f"{API_BASE}/api/wireguard/keys/peer",
            json={},
            headers={'Content-Type': 'application/json'},
        )
        assert r.status_code == 400
        _assert_json_error(r)

    def test_generate_keys_missing_name_returns_400(self):
        r = post('/api/wireguard/keys/peer', json={'other_field': 'value'})
        assert r.status_code == 400

    def test_generate_keys_null_name_returns_400(self):
        r = post('/api/wireguard/keys/peer', json={'name': None})
        assert r.status_code == 400


# ---------------------------------------------------------------------------
# Generic: all non-existent URL paths return 404 (Flask default)
# ---------------------------------------------------------------------------

class TestNotFoundRoutes:
    def test_unknown_api_path_returns_404(self):
        r = get('/api/this-route-does-not-exist-at-all')
        assert r.status_code == 404

    def test_peer_detail_nonexistent_returns_404(self):
        # GET is not defined for /api/peers/<peer_name> in app.py —
        # only PUT and DELETE exist.  Flask should return 405 Method Not Allowed.
        r = get(f'/api/peers/{_GHOST_PEER}')
        assert r.status_code in (404, 405)

    def test_update_nonexistent_peer_gives_404_not_500(self):
        r = put(f'/api/peers/{_GHOST_PEER}', json={'description': 'test'})
        assert r.status_code == 404
        r.json()  # must be valid JSON with 'error' key