"""
Todo类的单元测试
"""

import pytest
from todo.todo import Todo, TodoItem


class TestTodoItem:
    """TodoItem类测试"""
    
    def test_create_todo_item(self):
        """测试创建TodoItem"""
        item = TodoItem(id=1, title="测试任务")
        assert item.id == 1
        assert item.title == "测试任务"
        assert item.completed is False
        assert item.created_at is not None
    
    def test_todo_item_to_dict(self):
        """测试TodoItem转字典"""
        item = TodoItem(id=1, title="测试任务", completed=True)
        data = item.to_dict()
        assert data["id"] == 1
        assert data["title"] == "测试任务"
        assert data["completed"] is True
        assert "created_at" in data
    
    def test_todo_item_from_dict(self):
        """测试从字典创建TodoItem"""
        data = {
            "id": 1,
            "title": "测试任务",
            "completed": True,
            "created_at": "2024-02-08 10:00:00"
        }
        item = TodoItem.from_dict(data)
        assert item.id == 1
        assert item.title == "测试任务"
        assert item.completed is True
        assert item.created_at == "2024-02-08 10:00:00"
    
    def test_todo_item_repr(self):
        """测试TodoItem字符串表示"""
        item = TodoItem(id=1, title="测试任务")
        assert "1" in repr(item)
        assert "测试任务" in repr(item)


class TestTodo:
    """Todo类测试"""
    
    def test_create_todo(self):
        """测试创建Todo对象"""
        todo = Todo()
        assert len(todo.items) == 0
        assert todo.next_id == 1
    
    def test_add_todo_item(self):
        """测试添加待办事项"""
        todo = Todo()
        item = todo.add("买菜")
        assert item.id == 1
        assert item.title == "买菜"
        assert len(todo.items) == 1
        assert todo.next_id == 2
    
    def test_add_multiple_items(self):
        """测试添加多个待办事项"""
        todo = Todo()
        todo.add("任务1")
        todo.add("任务2")
        todo.add("任务3")
        assert len(todo.items) == 3
        assert todo.next_id == 4
    
    def test_add_empty_title_raises_error(self):
        """测试添加空标题抛出异常"""
        todo = Todo()
        with pytest.raises(ValueError):
            todo.add("")
        with pytest.raises(ValueError):
            todo.add("   ")
    
    def test_add_strips_whitespace(self):
        """测试添加时去除空白字符"""
        todo = Todo()
        item = todo.add("  买菜  ")
        assert item.title == "买菜"
    
    def test_delete_todo_item(self):
        """测试删除待办事项"""
        todo = Todo()
        todo.add("任务1")
        todo.add("任务2")
        assert todo.delete(1) is True
        assert len(todo.items) == 1
        assert todo.items[0].id == 2
    
    def test_delete_nonexistent_item(self):
        """测试删除不存在的事项"""
        todo = Todo()
        assert todo.delete(999) is False
    
    def test_complete_todo_item(self):
        """测试标记完成"""
        todo = Todo()
        item = todo.add("任务1")
        assert item.completed is False
        assert todo.complete(1) is True
        assert item.completed is True
    
    def test_complete_nonexistent_item(self):
        """测试标记不存在的事项为完成"""
        todo = Todo()
        assert todo.complete(999) is False
    
    def test_uncomplete_todo_item(self):
        """测试标记未完成"""
        todo = Todo()
        item = todo.add("任务1")
        todo.complete(1)
        assert item.completed is True
        assert todo.uncomplete(1) is True
        assert item.completed is False
    
    def test_get_by_id(self):
        """测试根据ID获取事项"""
        todo = Todo()
        todo.add("任务1")
        todo.add("任务2")
        item = todo.get_by_id(2)
        assert item is not None
        assert item.title == "任务2"
        assert todo.get_by_id(999) is None
    
    def test_get_all(self):
        """测试获取所有事项"""
        todo = Todo()
        todo.add("任务1")
        todo.add("任务2")
        items = todo.get_all()
        assert len(items) == 2
        # 确保返回的是副本
        items.clear()
        assert len(todo.items) == 2
    
    def test_get_pending(self):
        """测试获取未完成事项"""
        todo = Todo()
        todo.add("任务1")
        todo.add("任务2")
        todo.add("任务3")
        todo.complete(2)
        pending = todo.get_pending()
        assert len(pending) == 2
        assert all(not item.completed for item in pending)
    
    def test_get_completed(self):
        """测试获取已完成事项"""
        todo = Todo()
        todo.add("任务1")
        todo.add("任务2")
        todo.add("任务3")
        todo.complete(1)
        todo.complete(3)
        completed = todo.get_completed()
        assert len(completed) == 2
        assert all(item.completed for item in completed)
    
    def test_clear_completed(self):
        """测试清除已完成事项"""
        todo = Todo()
        todo.add("任务1")
        todo.add("任务2")
        todo.add("任务3")
        todo.complete(1)
        todo.complete(2)
        count = todo.clear_completed()
        assert count == 2
        assert len(todo.items) == 1
        assert todo.items[0].id == 3
    
    def test_to_dict(self):
        """测试转换为字典"""
        todo = Todo()
        todo.add("任务1")
        todo.add("任务2")
        data = todo.to_dict()
        assert "todos" in data
        assert "next_id" in data
        assert len(data["todos"]) == 2
        assert data["next_id"] == 3
    
    def test_from_dict(self):
        """测试从字典加载"""
        data = {
            "todos": [
                {"id": 1, "title": "任务1", "completed": False, "created_at": "2024-02-08 10:00:00"},
                {"id": 2, "title": "任务2", "completed": True, "created_at": "2024-02-08 11:00:00"}
            ],
            "next_id": 3
        }
        todo = Todo()
        todo.from_dict(data)
        assert len(todo.items) == 2
        assert todo.next_id == 3
        assert todo.items[0].title == "任务1"
        assert todo.items[1].completed is True