"""
Storage类的单元测试
"""

import os
import json
import pytest
from todo.todo import Todo
from todo.storage import Storage


@pytest.fixture
def temp_storage(tmp_path):
    """创建临时存储文件"""
    filepath = tmp_path / "test_todos.json"
    return Storage(str(filepath))


class TestStorage:
    """Storage类测试"""
    
    def test_create_storage(self, temp_storage):
        """测试创建Storage对象"""
        assert temp_storage.filepath.endswith("test_todos.json")
    
    def test_save_and_load(self, temp_storage):
        """测试保存和加载"""
        todo = Todo()
        todo.add("任务1")
        todo.add("任务2")
        todo.complete(1)
        
        # 保存
        assert temp_storage.save(todo) is True
        assert temp_storage.exists() is True
        
        # 加载
        loaded_todo = temp_storage.load()
        assert len(loaded_todo.items) == 2
        assert loaded_todo.items[0].title == "任务1"
        assert loaded_todo.items[0].completed is True
        assert loaded_todo.items[1].title == "任务2"
        assert loaded_todo.next_id == 3
    
    def test_load_nonexistent_file(self, temp_storage):
        """测试加载不存在的文件"""
        todo = temp_storage.load()
        assert len(todo.items) == 0
        assert todo.next_id == 1
    
    def test_load_invalid_json(self, temp_storage):
        """测试加载无效的JSON文件"""
        # 创建无效的JSON文件
        with open(temp_storage.filepath, 'w') as f:
            f.write("invalid json content")
        
        todo = temp_storage.load()
        assert len(todo.items) == 0
        assert todo.next_id == 1
    
    def test_exists(self, temp_storage):
        """测试文件存在性检查"""
        assert temp_storage.exists() is False
        
        todo = Todo()
        temp_storage.save(todo)
        assert temp_storage.exists() is True
    
    def test_delete(self, temp_storage):
        """测试删除存储文件"""
        todo = Todo()
        temp_storage.save(todo)
        assert temp_storage.exists() is True
        
        assert temp_storage.delete() is True
        assert temp_storage.exists() is False
    
    def test_delete_nonexistent_file(self, temp_storage):
        """测试删除不存在的文件"""
        assert temp_storage.delete() is True
    
    def test_save_creates_valid_json(self, temp_storage):
        """测试保存的JSON格式正确"""
        todo = Todo()
        todo.add("任务1")
        temp_storage.save(todo)
        
        with open(temp_storage.filepath, 'r', encoding='utf-8') as f:
            data = json.load(f)
        
        assert "todos" in data
        assert "next_id" in data
        assert isinstance(data["todos"], list)
        assert isinstance(data["next_id"], int)
    
    def test_save_preserves_chinese_characters(self, temp_storage):
        """测试保存中文字符"""
        todo = Todo()
        todo.add("买菜做饭")
        temp_storage.save(todo)
        
        loaded_todo = temp_storage.load()
        assert loaded_todo.items[0].title == "买菜做饭"