"""Tests for Cookie persistence functionality

Tests CookieManager class for saving and loading cookies from ~/.kb_env file.
"""

import stat
import pytest
from pathlib import Path

from kb_workflow.auth.cookie_manager import CookieManager


class TestCookieManager:
    """Test suite for CookieManager class"""

    def test_save_cookie_creates_file(self, tmp_path: Path):
        """Test that saving cookie creates the env file"""
        # Arrange
        env_file = tmp_path / ".kb_env"
        manager = CookieManager(env_path=env_file)
        cookie_str = "z_c0=token123; _zap=zap_value"

        # Act
        manager.save_cookie(cookie_str)

        # Assert
        assert env_file.exists()
        content = env_file.read_text(encoding="utf-8")
        assert 'ZHIHU_COOKIE="z_c0=token123; _zap=zap_value"' in content

    def test_save_cookie_updates_existing(self, tmp_path: Path):
        """Test that saving cookie updates existing ZHIHU_COOKIE line"""
        # Arrange
        env_file = tmp_path / ".kb_env"
        env_file.write_text('ZHIHU_COOKIE="old_cookie"\n', encoding="utf-8")
        manager = CookieManager(env_path=env_file)
        new_cookie = "z_c0=new_token"

        # Act
        manager.save_cookie(new_cookie)

        # Assert
        content = env_file.read_text(encoding="utf-8")
        assert 'ZHIHU_COOKIE="z_c0=new_token"' in content
        assert "old_cookie" not in content

    def test_save_cookie_appends_new(self, tmp_path: Path):
        """Test that saving cookie appends new line when ZHIHU_COOKIE doesn't exist"""
        # Arrange
        env_file = tmp_path / ".kb_env"
        env_file.write_text("OTHER_VAR=value\n", encoding="utf-8")
        manager = CookieManager(env_path=env_file)
        cookie_str = "z_c0=token"

        # Act
        manager.save_cookie(cookie_str)

        # Assert
        content = env_file.read_text(encoding="utf-8")
        assert "OTHER_VAR=value" in content
        assert 'ZHIHU_COOKIE="z_c0=token"' in content

    def test_save_cookie_preserves_other_lines(self, tmp_path: Path):
        """Test that saving cookie preserves other configuration lines"""
        # Arrange
        env_file = tmp_path / ".kb_env"
        env_file.write_text(
            "KB_BASE_PATH=/path/to/kb\nOTHER_VAR=value\n",
            encoding="utf-8"
        )
        manager = CookieManager(env_path=env_file)
        cookie_str = "z_c0=token"

        # Act
        manager.save_cookie(cookie_str)

        # Assert
        content = env_file.read_text(encoding="utf-8")
        assert "KB_BASE_PATH=/path/to/kb" in content
        assert "OTHER_VAR=value" in content
        assert 'ZHIHU_COOKIE="z_c0=token"' in content

    def test_save_cookie_sets_file_permissions(self, tmp_path: Path):
        """Test that saved file has 600 permissions"""
        # Arrange
        env_file = tmp_path / ".kb_env"
        manager = CookieManager(env_path=env_file)
        cookie_str = "z_c0=token"

        # Act
        manager.save_cookie(cookie_str)

        # Assert
        file_stat = env_file.stat()
        file_mode = stat.filemode(file_stat.st_mode)
        # Check owner read/write only (600)
        assert (file_stat.st_mode & 0o777) == 0o600, f"Expected 600, got {oct(file_stat.st_mode & 0o777)}"

    def test_load_cookie_returns_saved(self, tmp_path: Path):
        """Test that loading cookie returns previously saved value"""
        # Arrange
        env_file = tmp_path / ".kb_env"
        manager = CookieManager(env_path=env_file)
        cookie_str = "z_c0=token123; _zap=zap_value"

        # Act
        manager.save_cookie(cookie_str)
        loaded = manager.load_cookie()

        # Assert
        assert loaded == "z_c0=token123; _zap=zap_value"

    def test_load_cookie_empty_if_not_exists(self, tmp_path: Path):
        """Test that loading cookie returns empty string if file doesn't exist"""
        # Arrange
        env_file = tmp_path / ".kb_env"
        manager = CookieManager(env_path=env_file)

        # Act
        loaded = manager.load_cookie()

        # Assert
        assert loaded == ""

    def test_load_cookie_empty_if_key_not_found(self, tmp_path: Path):
        """Test that loading cookie returns empty string if key not in file"""
        # Arrange
        env_file = tmp_path / ".kb_env"
        env_file.write_text("OTHER_VAR=value\n", encoding="utf-8")
        manager = CookieManager(env_path=env_file)

        # Act
        loaded = manager.load_cookie()

        # Assert
        assert loaded == ""