"""Unit coverage for SPEC-008 (CFG-01..03)."""

import unittest
from unittest.mock import mock_open, patch

import toml

from fjerkroa_bot import FjerkroaBot
from fjerkroa_bot.ai_responder import AIMessage, AIResponder


class TestConfigLoad(unittest.TestCase):
    def test_load_config_parses_toml(self):
        """CFG-01: load_config parses the TOML file into a plain dict."""
        data = {"system": "prompt", "history-limit": 7, "additional-responders": []}
        with patch("builtins.open", mock_open(read_data=toml.dumps(data))):
            result = FjerkroaBot.load_config("config.toml")
        self.assertEqual(result, data)


class TestPerChannelPrompt(unittest.TestCase):
    def test_channel_override_wins(self):
        """CFG-02: responder bound to a channel uses config[channel] over config['system']."""
        config = {"system": "Default prompt", "kitchen": "Kitchen prompt", "history-limit": 5}
        responder = AIResponder(config, "kitchen")
        system = responder.message(AIMessage("alice", "hei", "kitchen"))[0]["content"]
        self.assertTrue(system.startswith("Kitchen prompt"))

    def test_fallback_to_system(self):
        """CFG-02: without a channel key the shared system prompt is used."""
        config = {"system": "Default prompt", "history-limit": 5}
        responder = AIResponder(config, "kitchen")
        system = responder.message(AIMessage("alice", "hei", "kitchen"))[0]["content"]
        self.assertTrue(system.startswith("Default prompt"))


class TestNewsFileMissing(unittest.TestCase):
    def test_missing_news_file_keeps_placeholder(self):
        """CFG-03: nonexistent news file -> {news} placeholder stays literal, no crash."""
        config = {"system": "N: {news}", "history-limit": 5, "news": "/nonexistent/news.txt"}
        responder = AIResponder(config, "chat")
        system = responder.message(AIMessage("alice", "hei"))[0]["content"]
        self.assertIn("{news}", system)