"""Tests for configuration loading and proxy URL parsing."""

import pytest

from s5p.config import (
    ChainHop,
    Config,
    ListenerConfig,
    load_config,
    parse_api_proxies,
    parse_proxy_url,
)


class TestParseProxyUrl:
    """Test proxy URL parsing."""

    def test_socks5_basic(self):
        hop = parse_proxy_url("socks5://127.0.0.1:9050")
        assert hop.proto == "socks5"
        assert hop.host == "127.0.0.1"
        assert hop.port == 9050
        assert hop.username is None
        assert hop.password is None

    def test_socks5_with_auth(self):
        hop = parse_proxy_url("socks5://user:pass@proxy.example.com:1080")
        assert hop.proto == "socks5"
        assert hop.host == "proxy.example.com"
        assert hop.port == 1080
        assert hop.username == "user"
        assert hop.password == "pass"

    def test_socks4(self):
        hop = parse_proxy_url("socks4://10.0.0.1:1080")
        assert hop.proto == "socks4"
        assert hop.host == "10.0.0.1"
        assert hop.port == 1080

    def test_http_connect(self):
        hop = parse_proxy_url("http://proxy:8080")
        assert hop.proto == "http"
        assert hop.host == "proxy"
        assert hop.port == 8080

    def test_default_port_socks5(self):
        hop = parse_proxy_url("socks5://host")
        assert hop.port == 1080

    def test_default_port_http(self):
        hop = parse_proxy_url("http://host")
        assert hop.port == 8080

    def test_unsupported_protocol(self):
        with pytest.raises(ValueError, match="unsupported protocol"):
            parse_proxy_url("ftp://host:21")

    def test_missing_host(self):
        with pytest.raises(ValueError, match="missing host"):
            parse_proxy_url("socks5://")


class TestChainHop:
    """Test ChainHop string representation."""

    def test_str_without_auth(self):
        hop = ChainHop(proto="socks5", host="localhost", port=9050)
        assert str(hop) == "socks5://localhost:9050"

    def test_str_with_auth(self):
        hop = ChainHop(proto="http", host="proxy", port=8080, username="u", password="p")
        assert str(hop) == "http://u@proxy:8080"


class TestParseApiProxies:
    """Test API response proxy parsing."""

    def test_valid_entries(self):
        data = {
            "proxies": [
                {"proto": "socks5", "proxy": "1.2.3.4:1080"},
                {"proto": "http", "proxy": "5.6.7.8:8080"},
            ],
        }
        result = parse_api_proxies(data)
        assert len(result) == 2
        assert result[0] == ChainHop(proto="socks5", host="1.2.3.4", port=1080)
        assert result[1] == ChainHop(proto="http", host="5.6.7.8", port=8080)

    def test_skips_invalid_proto(self):
        data = {"proxies": [{"proto": "ftp", "proxy": "1.2.3.4:21"}]}
        assert parse_api_proxies(data) == []

    def test_skips_missing_proto(self):
        data = {"proxies": [{"proxy": "1.2.3.4:1080"}]}
        assert parse_api_proxies(data) == []

    def test_skips_missing_colon(self):
        data = {"proxies": [{"proto": "socks5", "proxy": "no-port"}]}
        assert parse_api_proxies(data) == []

    def test_skips_bad_port(self):
        data = {"proxies": [{"proto": "socks5", "proxy": "1.2.3.4:abc"}]}
        assert parse_api_proxies(data) == []

    def test_empty_proxies(self):
        assert parse_api_proxies({"proxies": []}) == []

    def test_missing_proxies_key(self):
        assert parse_api_proxies({}) == []

    def test_mixed_valid_invalid(self):
        data = {
            "proxies": [
                {"proto": "socks5", "proxy": "1.2.3.4:1080"},
                {"proto": "ftp", "proxy": "bad:21"},
                {"proto": "socks4", "proxy": "5.6.7.8:1080"},
            ],
        }
        result = parse_api_proxies(data)
        assert len(result) == 2
        assert result[0].proto == "socks5"
        assert result[1].proto == "socks4"


class TestConfig:
    """Test Config defaults."""

    def test_defaults(self):
        c = Config()
        assert c.listen_host == "127.0.0.1"
        assert c.listen_port == 1080
        assert c.chain == []
        assert c.timeout == 10.0
        assert c.max_connections == 256
        assert c.pool_size == 0
        assert c.pool_max_idle == 30.0

    def test_max_connections_from_yaml(self, tmp_path):
        cfg_file = tmp_path / "test.yaml"
        cfg_file.write_text("max_connections: 512\n")
        c = load_config(cfg_file)
        assert c.max_connections == 512

    def test_pool_size_from_yaml(self, tmp_path):
        cfg_file = tmp_path / "test.yaml"
        cfg_file.write_text("pool_size: 16\npool_max_idle: 45.0\n")
        c = load_config(cfg_file)
        assert c.pool_size == 16
        assert c.pool_max_idle == 45.0

    def test_tor_config_from_yaml(self, tmp_path):
        cfg_file = tmp_path / "test.yaml"
        cfg_file.write_text(
            "tor:\n"
            "  control_host: 10.0.0.1\n"
            "  control_port: 9151\n"
            "  password: secret\n"
            "  cookie_file: /var/run/tor/cookie\n"
            "  newnym_interval: 60\n"
        )
        c = load_config(cfg_file)
        assert c.tor is not None
        assert c.tor.control_host == "10.0.0.1"
        assert c.tor.control_port == 9151
        assert c.tor.password == "secret"
        assert c.tor.cookie_file == "/var/run/tor/cookie"
        assert c.tor.newnym_interval == 60.0

    def test_tor_config_defaults(self, tmp_path):
        cfg_file = tmp_path / "test.yaml"
        cfg_file.write_text("tor:\n  password: test\n")
        c = load_config(cfg_file)
        assert c.tor is not None
        assert c.tor.control_host == "127.0.0.1"
        assert c.tor.control_port == 9051
        assert c.tor.cookie_file == ""
        assert c.tor.newnym_interval == 0.0

    def test_no_tor_config(self, tmp_path):
        cfg_file = tmp_path / "test.yaml"
        cfg_file.write_text("listen: 1080\n")
        c = load_config(cfg_file)
        assert c.tor is None

    def test_proxy_pool_test_targets(self, tmp_path):
        cfg_file = tmp_path / "test.yaml"
        cfg_file.write_text(
            "proxy_pool:\n"
            "  sources: []\n"
            "  test_targets:\n"
            "    - host-a.example.com\n"
            "    - host-b.example.com\n"
        )
        c = load_config(cfg_file)
        assert c.proxy_pool is not None
        assert c.proxy_pool.test_targets == ["host-a.example.com", "host-b.example.com"]
        assert c.proxy_pool.test_url == ""

    def test_proxy_pool_legacy_test_url(self, tmp_path):
        cfg_file = tmp_path / "test.yaml"
        cfg_file.write_text(
            "proxy_pool:\n"
            "  sources: []\n"
            "  test_url: http://httpbin.org/ip\n"
        )
        c = load_config(cfg_file)
        assert c.proxy_pool is not None
        assert c.proxy_pool.test_targets == ["httpbin.org"]

    def test_proxy_pool_defaults(self, tmp_path):
        cfg_file = tmp_path / "test.yaml"
        cfg_file.write_text(
            "proxy_pool:\n"
            "  sources: []\n"
        )
        c = load_config(cfg_file)
        assert c.proxy_pool is not None
        assert c.proxy_pool.test_targets == [
            "www.google.com", "www.cloudflare.com", "www.amazon.com",
        ]


class TestListenerConfig:
    """Test multi-listener config parsing."""

    def test_defaults(self):
        lc = ListenerConfig()
        assert lc.listen_host == "127.0.0.1"
        assert lc.listen_port == 1080
        assert lc.chain == []
        assert lc.pool_hops == 0

    def test_listeners_from_yaml(self, tmp_path):
        cfg_file = tmp_path / "test.yaml"
        cfg_file.write_text(
            "listeners:\n"
            "  - listen: 0.0.0.0:1080\n"
            "    chain:\n"
            "      - socks5://127.0.0.1:9050\n"
            "  - listen: 0.0.0.0:1081\n"
            "    chain:\n"
            "      - socks5://127.0.0.1:9050\n"
            "      - pool\n"
            "  - listen: 0.0.0.0:1082\n"
            "    chain:\n"
            "      - socks5://127.0.0.1:9050\n"
            "      - pool\n"
            "      - pool\n"
        )
        c = load_config(cfg_file)
        assert len(c.listeners) == 3

        # listener 0: no pool hops
        assert c.listeners[0].listen_host == "0.0.0.0"
        assert c.listeners[0].listen_port == 1080
        assert len(c.listeners[0].chain) == 1
        assert c.listeners[0].pool_hops == 0

        # listener 1: 1 pool hop
        assert c.listeners[1].listen_port == 1081
        assert len(c.listeners[1].chain) == 1
        assert c.listeners[1].pool_hops == 1

        # listener 2: 2 pool hops
        assert c.listeners[2].listen_port == 1082
        assert len(c.listeners[2].chain) == 1
        assert c.listeners[2].pool_hops == 2

    def test_pool_keyword_stripped_from_chain(self, tmp_path):
        cfg_file = tmp_path / "test.yaml"
        cfg_file.write_text(
            "listeners:\n"
            "  - listen: 1080\n"
            "    chain:\n"
            "      - socks5://tor:9050\n"
            "      - pool\n"
            "      - pool\n"
        )
        c = load_config(cfg_file)
        lc = c.listeners[0]
        # only the real hop remains in chain
        assert len(lc.chain) == 1
        assert lc.chain[0].host == "tor"
        assert lc.pool_hops == 2

    def test_pool_keyword_case_insensitive(self, tmp_path):
        cfg_file = tmp_path / "test.yaml"
        cfg_file.write_text(
            "listeners:\n"
            "  - listen: 1080\n"
            "    chain:\n"
            "      - Pool\n"
        )
        c = load_config(cfg_file)
        assert c.listeners[0].pool_hops == 1
        assert c.listeners[0].chain == []


class TestListenerBackwardCompat:
    """Test backward-compatible single listener from old format."""

    def test_old_format_creates_single_listener(self, tmp_path):
        cfg_file = tmp_path / "test.yaml"
        cfg_file.write_text(
            "listen: 0.0.0.0:9999\n"
            "chain:\n"
            "  - socks5://127.0.0.1:9050\n"
        )
        c = load_config(cfg_file)
        assert len(c.listeners) == 1
        lc = c.listeners[0]
        assert lc.listen_host == "0.0.0.0"
        assert lc.listen_port == 9999
        assert len(lc.chain) == 1
        assert lc.pool_hops == 0

    def test_empty_config_creates_single_listener(self, tmp_path):
        cfg_file = tmp_path / "test.yaml"
        cfg_file.write_text("")
        c = load_config(cfg_file)
        assert len(c.listeners) == 1
        lc = c.listeners[0]
        assert lc.listen_host == "127.0.0.1"
        assert lc.listen_port == 1080


class TestListenerPoolCompat:
    """Test that proxy_pool + old format auto-sets pool_hops=1."""

    def test_pool_auto_appends(self, tmp_path):
        cfg_file = tmp_path / "test.yaml"
        cfg_file.write_text(
            "listen: 0.0.0.0:1080\n"
            "chain:\n"
            "  - socks5://127.0.0.1:9050\n"
            "proxy_pool:\n"
            "  sources:\n"
            "    - url: http://api:8081/proxies\n"
        )
        c = load_config(cfg_file)
        assert len(c.listeners) == 1
        lc = c.listeners[0]
        assert lc.pool_hops == 1

    def test_explicit_listeners_no_auto_append(self, tmp_path):
        cfg_file = tmp_path / "test.yaml"
        cfg_file.write_text(
            "listeners:\n"
            "  - listen: 0.0.0.0:1080\n"
            "    chain:\n"
            "      - socks5://127.0.0.1:9050\n"
            "proxy_pool:\n"
            "  sources:\n"
            "    - url: http://api:8081/proxies\n"
        )
        c = load_config(cfg_file)
        assert len(c.listeners) == 1
        lc = c.listeners[0]
        # explicit listeners: no auto pool_hops
        assert lc.pool_hops == 0