"""Tests for config.py module."""

from __future__ import annotations

import os
from pathlib import Path

import pytest

from src.config import APIConfig, Config, PublisherConfig, ScraperConfig
from src.exceptions import ConfigurationError


def test_api_config_creation() -> None:
    """Test APIConfig creation."""
    config = APIConfig(
        openai_key="sk-test123", node_api_url="http://localhost:3000", timeout_seconds=30
    )
    assert config.openai_key == "sk-test123"
    assert config.node_api_url == "http://localhost:3000"
    assert config.timeout_seconds == 30


def test_scraper_config_creation() -> None:
    """Test ScraperConfig creation."""
    config = ScraperConfig(
        sources=["https://example.com"], max_articles=10, timeout_seconds=10
    )
    assert config.sources == ["https://example.com"]
    assert config.max_articles == 10
    assert config.timeout_seconds == 10


def test_publisher_config_creation() -> None:
    """Test PublisherConfig creation."""
    config = PublisherConfig(output_dir=Path("./output"))
    assert config.output_dir == Path("./output")


def test_config_from_env_success(monkeypatch: pytest.MonkeyPatch) -> None:
    """Test successful configuration loading from environment."""
    monkeypatch.setenv("OPENAI_API_KEY", "sk-test123")
    monkeypatch.setenv("NODE_API_URL", "http://localhost:3000")
    monkeypatch.setenv("NEWS_SOURCES", "https://example.com,https://test.com")
    monkeypatch.setenv("LOG_LEVEL", "DEBUG")

    config = Config.from_env()

    assert config.api.openai_key == "sk-test123"
    assert config.api.node_api_url == "http://localhost:3000"
    assert config.scraper.sources == ["https://example.com", "https://test.com"]
    assert config.log_level == "DEBUG"


def test_config_from_env_missing_openai_key(monkeypatch: pytest.MonkeyPatch) -> None:
    """Test configuration fails when OPENAI_API_KEY is missing."""
    monkeypatch.delenv("OPENAI_API_KEY", raising=False)
    monkeypatch.setenv("NODE_API_URL", "http://localhost:3000")
    monkeypatch.setenv("NEWS_SOURCES", "https://example.com")

    with pytest.raises(ConfigurationError, match="OPENAI_API_KEY"):
        Config.from_env()


def test_config_from_env_invalid_openai_key(monkeypatch: pytest.MonkeyPatch) -> None:
    """Test configuration fails when OPENAI_API_KEY has invalid format."""
    monkeypatch.setenv("OPENAI_API_KEY", "invalid-key")
    monkeypatch.setenv("NODE_API_URL", "http://localhost:3000")
    monkeypatch.setenv("NEWS_SOURCES", "https://example.com")

    with pytest.raises(ConfigurationError, match="must start with 'sk-'"):
        Config.from_env()


def test_config_from_env_missing_node_api_url(monkeypatch: pytest.MonkeyPatch) -> None:
    """Test configuration fails when NODE_API_URL is missing."""
    monkeypatch.setenv("OPENAI_API_KEY", "sk-test123")
    monkeypatch.delenv("NODE_API_URL", raising=False)
    monkeypatch.setenv("NEWS_SOURCES", "https://example.com")

    with pytest.raises(ConfigurationError, match="NODE_API_URL"):
        Config.from_env()


def test_config_from_env_invalid_node_api_url(monkeypatch: pytest.MonkeyPatch) -> None:
    """Test configuration fails when NODE_API_URL is invalid."""
    monkeypatch.setenv("OPENAI_API_KEY", "sk-test123")
    monkeypatch.setenv("NODE_API_URL", "not-a-url")
    monkeypatch.setenv("NEWS_SOURCES", "https://example.com")

    with pytest.raises(ConfigurationError, match="Invalid NODE_API_URL"):
        Config.from_env()


def test_config_from_env_missing_news_sources(monkeypatch: pytest.MonkeyPatch) -> None:
    """Test configuration fails when NEWS_SOURCES is missing."""
    monkeypatch.setenv("OPENAI_API_KEY", "sk-test123")
    monkeypatch.setenv("NODE_API_URL", "http://localhost:3000")
    monkeypatch.delenv("NEWS_SOURCES", raising=False)

    with pytest.raises(ConfigurationError, match="NEWS_SOURCES"):
        Config.from_env()


def test_config_from_env_invalid_news_source(monkeypatch: pytest.MonkeyPatch) -> None:
    """Test configuration fails when NEWS_SOURCES contains invalid URL."""
    monkeypatch.setenv("OPENAI_API_KEY", "sk-test123")
    monkeypatch.setenv("NODE_API_URL", "http://localhost:3000")
    monkeypatch.setenv("NEWS_SOURCES", "not-a-url")

    with pytest.raises(ConfigurationError, match="Invalid source URL"):
        Config.from_env()


def test_config_from_env_invalid_timeout(monkeypatch: pytest.MonkeyPatch) -> None:
    """Test configuration fails when timeout is not a valid integer."""
    monkeypatch.setenv("OPENAI_API_KEY", "sk-test123")
    monkeypatch.setenv("NODE_API_URL", "http://localhost:3000")
    monkeypatch.setenv("NEWS_SOURCES", "https://example.com")
    monkeypatch.setenv("API_TIMEOUT", "invalid")

    with pytest.raises(ConfigurationError, match="Invalid API_TIMEOUT"):
        Config.from_env()


def test_config_from_env_negative_timeout(monkeypatch: pytest.MonkeyPatch) -> None:
    """Test configuration fails when timeout is negative."""
    monkeypatch.setenv("OPENAI_API_KEY", "sk-test123")
    monkeypatch.setenv("NODE_API_URL", "http://localhost:3000")
    monkeypatch.setenv("NEWS_SOURCES", "https://example.com")
    monkeypatch.setenv("API_TIMEOUT", "-1")

    with pytest.raises(ConfigurationError, match="API_TIMEOUT must be positive"):
        Config.from_env()


def test_config_from_env_invalid_log_level(monkeypatch: pytest.MonkeyPatch) -> None:
    """Test configuration fails when LOG_LEVEL is invalid."""
    monkeypatch.setenv("OPENAI_API_KEY", "sk-test123")
    monkeypatch.setenv("NODE_API_URL", "http://localhost:3000")
    monkeypatch.setenv("NEWS_SOURCES", "https://example.com")
    monkeypatch.setenv("LOG_LEVEL", "INVALID")

    with pytest.raises(ConfigurationError, match="Invalid LOG_LEVEL"):
        Config.from_env()


def test_config_immutability() -> None:
    """Test that config objects are immutable."""
    config = APIConfig(
        openai_key="sk-test123", node_api_url="http://localhost:3000"
    )

    with pytest.raises(Exception):  # dataclass frozen=True raises FrozenInstanceError
        config.openai_key = "sk-changed"  # type: ignore