"""Integration tests for networkd interactions with other subsystems.

Tests TF-8 (DNS upstream sync), TF-9 (DHCP range inference), TF-10 (zone inference).
"""

import json
from pathlib import Path
from unittest.mock import patch

import pytest

from lib import network as _net


@pytest.fixture
def tmp_network(tmp_path):
    orig_config = _net.CONFIG_FILE
    orig_data = _net.DATA_DIR
    _net.CONFIG_FILE = tmp_path / "config" / "network" / "config.json"
    _net.DATA_DIR = tmp_path / "data" / "networkd"
    yield tmp_path
    _net.CONFIG_FILE = orig_config
    _net.DATA_DIR = orig_data


# =================================================================
# TF-13: Integration tests — DNS upstream sync
# =================================================================


class TestDnsUpstreamIntegration:
    """collect_upstream_dns + set_upstreams integration."""

    def test_wan_dns_becomes_dnsmasq_upstream(self, tmp_network):
        """WAN interface with public DNS should produce upstream list."""
        cfg = _net.get_config()
        cfg["interfaces"] = {
            "eth0": {
                "dhcp": "ipv4",
                "dns": ["8.8.8.8", "1.1.1.1"],
            },
            "lan0": {
                "addresses": [{"address": "192.168.1.1/24"}],
                "dns": ["127.0.0.1"],
            },
        }
        _net.save_config(cfg)

        upstreams = _net.collect_upstream_dns(cfg)
        assert "8.8.8.8" in upstreams
        assert "1.1.1.1" in upstreams
        assert "127.0.0.1" not in upstreams

    def test_all_dns_local_yields_empty(self, tmp_network):
        """When all DNS servers are local, no upstreams."""
        cfg = {
            "interfaces": {
                "lan0": {
                    "addresses": [{"address": "192.168.1.1/24"}],
                    "dns": ["127.0.0.1", "192.168.1.1"],
                    "ipv6_dns": ["fe80::1"],
                }
            }
        }
        _net.save_config(cfg)
        upstreams = _net.collect_upstream_dns(cfg)
        assert upstreams == []

    def test_mixed_v4_v6_upstreams(self, tmp_network):
        """Collects both IPv4 and IPv6 public DNS."""
        cfg = {
            "interfaces": {
                "eth0": {
                    "dns": ["8.8.8.8"],
                    "ipv6_dns": ["2001:4860:4860::8888"],
                }
            }
        }
        _net.save_config(cfg)
        upstreams = _net.collect_upstream_dns(cfg)
        assert "8.8.8.8" in upstreams
        assert "2001:4860:4860::8888" in upstreams

    def test_upstream_dns_after_generate_files(self, tmp_network):
        """Full flow: save config -> generate files -> collect upstreams."""
        cfg = {
            "interfaces": {
                "eth0": {
                    "dhcp": "ipv4",
                    "dns": ["8.8.8.8", "192.168.1.1"],
                    "gateway": "10.0.0.254",
                }
            }
        }
        _net.save_config(cfg)
        result = _net.generate_network_files(cfg)

        assert len(result["generated"]) == 1
        upstreams = _net.collect_upstream_dns(cfg)
        assert "8.8.8.8" in upstreams
        assert "192.168.1.1" not in upstreams


# =================================================================
# TF-13: Integration tests — DHCP range inference
# =================================================================


class TestDhcpRangesIntegration:
    """infer_dhcp_ranges for multiple interface scenarios."""

    def test_multi_interface_ranges(self, tmp_network):
        """Each interface with static IP gets its own range."""
        cfg = {
            "interfaces": {
                "lan1": {
                    "addresses": [{"address": "192.168.1.1/24"}],
                },
                "lan2": {
                    "addresses": [{"address": "10.10.0.1/16"}],
                },
                "wan0": {
                    "dhcp": "ipv4",
                },
            }
        }
        _net.save_config(cfg)
        ranges = _net.infer_dhcp_ranges(cfg)

        assert "lan1" in ranges
        assert "lan2" in ranges
        assert "wan0" not in ranges

        assert ranges["lan1"]["start"] == "192.168.1.100"
        assert ranges["lan1"]["end"] == "192.168.1.200"
        assert ranges["lan2"]["start"] == "10.10.0.100"
        assert ranges["lan2"]["end"] == "10.10.0.200"

    def test_generate_then_infer(self, tmp_network):
        """End-to-end: save, generate, infer ranges."""
        cfg = {
            "interfaces": {
                "eth0": {
                    "addresses": [{"address": "172.16.0.1/24"}],
                    "gateway": "172.16.0.254",
                    "dns": ["8.8.8.8"],
                }
            }
        }
        _net.save_config(cfg)
        _net.generate_network_files(cfg)
        ranges = _net.infer_dhcp_ranges(cfg)

        assert "eth0" in ranges
        assert ranges["eth0"]["subnet"] == "172.16.0.0"
        assert ranges["eth0"]["prefix"] == 24

    def test_ranges_cross_reference_with_zones(self, tmp_network):
        """DHCP ranges for LAN interfaces correlate with zone inference."""
        cfg = {
            "interfaces": {
                "lan0": {
                    "addresses": [{"address": "192.168.1.1/24"}],
                },
                "wan0": {
                    "dhcp": "ipv4",
                },
            }
        }
        _net.save_config(cfg)
        ranges = _net.infer_dhcp_ranges(cfg)
        zones = _net.infer_zones(cfg)

        assert "lan0" in ranges
        assert zones["lan0"] == "lan"
        assert "wan0" not in ranges
        assert zones["wan0"] == "wan"


# =================================================================
# TF-13: Integration tests — zone inference with networkd config
# =================================================================


class TestZonesIntegration:
    """infer_zones with realistic networkd configurations."""

    def test_typical_router_setup(self, tmp_network):
        """WAN (DHCP), LAN (static), WG (WireGuard) zones."""
        cfg = {
            "interfaces": {
                "eth0": {
                    "dhcp": "ipv4",
                },
                "eth1": {
                    "addresses": [{"address": "192.168.1.1/24"}],
                    "gateway": "192.168.1.254",
                },
                "wg0": {
                    "addresses": [{"address": "10.137.0.1/24"}],
                },
                "br-mgmt": {
                    "addresses": [{"address": "10.0.0.1/24"}],
                    "routes": [
                        {"destination": "0.0.0.0/0", "gateway": "10.0.0.254"},
                    ],
                },
            }
        }
        _net.save_config(cfg)
        zones = _net.infer_zones(cfg)

        assert zones["eth0"] == "wan"
        assert zones["eth1"] == "lan"
        assert zones["wg0"] == "wan"
        assert zones["br-mgmt"] == "management"

    def test_zone_inference_after_generate(self, tmp_network):
        """Zone inference works after generate_network_files."""
        cfg = {
            "interfaces": {
                "wan0": {"dhcp": "ipv4"},
                "lan0": {"addresses": [{"address": "192.168.10.1/24"}]},
            }
        }
        _net.save_config(cfg)
        _net.generate_network_files(cfg)
        zones = _net.infer_zones(cfg)

        assert zones["wan0"] == "wan"
        assert zones["lan0"] == "lan"

    def test_full_pipeline(self, tmp_network):
        """Full pipeline: config -> generate -> DNS -> ranges -> zones."""
        cfg = {
            "interfaces": {
                "eth0": {
                    "dhcp": "ipv4",
                    "dns": ["8.8.8.8", "1.1.1.1", "192.168.1.1"],
                },
                "eth1": {
                    "addresses": [{"address": "192.168.1.1/24"}],
                    "dns": ["127.0.0.1"],
                },
                "wg0": {
                    "addresses": [{"address": "10.137.0.1/24"}],
                },
            }
        }
        _net.save_config(cfg)

        gen_result = _net.generate_network_files(cfg)
        assert len(gen_result["generated"]) == 3

        upstreams = _net.collect_upstream_dns(cfg)
        assert "8.8.8.8" in upstreams
        assert "1.1.1.1" in upstreams
        assert "192.168.1.1" not in upstreams
        assert "127.0.0.1" not in upstreams

        ranges = _net.infer_dhcp_ranges(cfg)
        assert "eth1" in ranges
        assert "eth0" not in ranges
        # wg0 has a static address so it also gets a candidate range
        assert "wg0" in ranges

        zones = _net.infer_zones(cfg)
        assert zones["eth0"] == "wan"
        assert zones["eth1"] == "lan"
        assert zones["wg0"] == "wan"


# =================================================================
# TF-11: state.py parser dedup verification
# =================================================================


class TestStateParserDedup:
    """Verify lib/state.py uses lib.network.parse_networkctl_status()."""

    def test_state_uses_network_parser(self):
        """The networkd collector should import from lib.network."""
        import daemon.collectors.networkd as _collector

        source = Path(_collector.__file__).read_text()
        assert "from lib.network import" in source
        assert "parse_networkctl_status" in source

    def test_networkd_collector_returns_correct_format(self):
        """_collect_networkd should return interfaces dict + timestamp."""
        import daemon.collectors.networkd as _collector

        with patch("daemon.collectors.networkd.run") as mock_run:
            mock_run.return_value = json.dumps(
                {
                    "Interfaces": [
                        {
                            "Name": "eth0",
                            "Type": "ether",
                            "OperationalState": "routable",
                            "Addresses": [
                                {
                                    "Family": 2,
                                    "Address": [10, 0, 0, 1],
                                    "PrefixLength": 24,
                                }
                            ],
                            "DNS": [
                                {"Family": 2, "Address": [8, 8, 8, 8]},
                            ],
                            "Routes": [
                                {
                                    "Family": 2,
                                    "Destination": [0, 0, 0, 0],
                                    "DestinationPrefixLength": 0,
                                    "Gateway": [10, 0, 0, 254],
                                }
                            ],
                        }
                    ]
                }
            )
            result = _collector._collect_networkd()

            assert "interfaces" in result
            assert "timestamp" in result
            assert "eth0" in result["interfaces"]
            assert "10.0.0.1/24" in result["interfaces"]["eth0"]["addresses"]

    def test_networkd_collector_handles_failure(self):
        """_collect_networkd returns empty interfaces on error."""
        import daemon.collectors.networkd as _collector

        with patch(
            "daemon.collectors.networkd.run", side_effect=RuntimeError("no networkctl")
        ):
            result = _collector._collect_networkd()

            assert result["interfaces"] == {}
            assert "timestamp" in result