"""Тесты для console_commands/logs.py."""
import importlib
from pathlib import Path
from unittest.mock import MagicMock


class TestLogsCommand:
    """Тесты консольной команды logs."""

    def _get_module(self):
        """Импортировать модуль logs."""
        return importlib.import_module("console_commands.logs")

    def _get_logs_func(self):
        """Импортировать функцию logs."""
        from console_commands.logs import logs
        return logs

    def test_logs_no_file(self, capfd):
        """Выводит сообщение если файл лога не существует."""
        stop_event = MagicMock()
        stop_event.is_set.return_value = False
        bot = MagicMock()

        mod = self._get_module()
        original = mod.LOG_FILE
        try:
            mod.LOG_FILE = Path("/nonexistent/bot.log")
            self._get_logs_func()(stop_event, bot)
        finally:
            mod.LOG_FILE = original

        captured = capfd.readouterr()
        assert "не найден" in captured.out

    def test_logs_reads_last_lines(self, capfd, tmp_path):
        """Выводит последние N строк лога."""
        log_file = tmp_path / "bot.log"
        lines = [f"Line {i}\n" for i in range(30)]
        log_file.write_text("".join(lines))

        stop_event = MagicMock()
        stop_event.is_set.return_value = False
        bot = MagicMock()

        mod = self._get_module()
        original = mod.LOG_FILE
        try:
            mod.LOG_FILE = log_file
            self._get_logs_func()(stop_event, bot, lines=5)
        finally:
            mod.LOG_FILE = original

        captured = capfd.readouterr()
        assert "Line 25" in captured.out
        assert "Line 29" in captured.out
        assert "Line 1" not in captured.out

    def test_logs_fewer_lines_than_requested(self, capfd, tmp_path):
        """Если строк меньше N, выводит все."""
        log_file = tmp_path / "bot.log"
        log_file.write_text("Line 1\nLine 2\n")

        stop_event = MagicMock()
        stop_event.is_set.return_value = False
        bot = MagicMock()

        mod = self._get_module()
        original = mod.LOG_FILE
        try:
            mod.LOG_FILE = log_file
            self._get_logs_func()(stop_event, bot, lines=10)
        finally:
            mod.LOG_FILE = original

        captured = capfd.readouterr()
        assert "Line 1" in captured.out
        assert "Line 2" in captured.out

    def test_logs_stop_event(self):
        """Не выполняется если stop_event установлен."""
        stop_event = MagicMock()
        stop_event.is_set.return_value = True
        bot = MagicMock()

        result = self._get_logs_func()(stop_event, bot)
        assert result is None