import pytest
from unittest.mock import patch
from src.classes.action.buy import Buy
from src.classes.region import CityRegion
from src.classes.elixir import ElixirType, ConsumedElixir
from src.classes.cultivation import Realm
from tests.conftest import create_test_weapon # Explicitly import if needed, or rely on conftest being auto-loaded (it is)

def test_buy_item_success(avatar_in_city, mock_item_data):
    """测试购买普通材料成功"""
    elixirs_mock = mock_item_data["elixirs"]
    materials_mock = mock_item_data["materials"]
    test_material = mock_item_data["obj_material"]
    
    # 模拟 CityRegion.is_selling 方法
    # 直接在 avatar_in_city.tile.region 上 mock 或者动态添加属性
    # 由于 avatar_in_city 使用了 mock_region，我们需要确保它有 is_selling
    # 假设 conftest 中 avatar_in_city.tile.region 是一个 CityRegion 实例或者 Mock
    
    # 我们这里动态 patch is_selling
    with patch.object(avatar_in_city.tile.region, 'is_selling', return_value=True) as mock_is_selling:
        with patch("src.utils.resolution.elixirs_by_name", elixirs_mock), \
             patch("src.utils.resolution.materials_by_name", materials_mock):
            
            action = Buy(avatar_in_city, avatar_in_city.world)
            
            # 1. 检查是否可购买
            can_start, reason = action.can_start("铁矿石")
            assert can_start is True
            mock_is_selling.assert_called_with("铁矿石")
            
            # 2. 执行购买
            initial_money = avatar_in_city.magic_stone
            # 练气期材料基础价格 10，倍率 1.5 -> 15
            expected_price = int(10 * 1.5)
            
            action._execute("铁矿石")
            
            # 3. 验证结果
            assert avatar_in_city.magic_stone == initial_money - expected_price
            assert avatar_in_city.get_material_quantity(test_material) == 1

def test_buy_elixir_success(avatar_in_city, mock_item_data):
    """测试购买并服用丹药成功"""
    elixirs_mock = mock_item_data["elixirs"]
    materials_mock = mock_item_data["materials"]
    test_elixir = mock_item_data["obj_elixir"]
    
    with patch.object(avatar_in_city.tile.region, 'is_selling', return_value=True):
        with patch("src.utils.resolution.elixirs_by_name", elixirs_mock), \
             patch("src.utils.resolution.materials_by_name", materials_mock):
            
            action = Buy(avatar_in_city, avatar_in_city.world)
            
            can_start, reason = action.can_start("聚气丹")
            assert can_start is True
            
            initial_money = avatar_in_city.magic_stone
            expected_price = int(test_elixir.price * 1.5)
            
            # 模拟服用丹药的行为
            action._execute("聚气丹")
            
            assert avatar_in_city.magic_stone == initial_money - expected_price
            # 背包里不应该有丹药
            assert len(avatar_in_city.materials) == 0 
            # 已服用列表应该有
            assert len(avatar_in_city.elixirs) == 1
            assert avatar_in_city.elixirs[0].elixir.name == "聚气丹"

def test_buy_fail_item_not_sold(avatar_in_city, mock_item_data):
    """测试商品不在商店售卖列表中"""
    elixirs_mock = mock_item_data["elixirs"]
    materials_mock = mock_item_data["materials"]
    
    # Mock is_selling 返回 False
    with patch.object(avatar_in_city.tile.region, 'is_selling', return_value=False):
        with patch("src.utils.resolution.elixirs_by_name", elixirs_mock), \
             patch("src.utils.resolution.materials_by_name", materials_mock):
             
            action = Buy(avatar_in_city, avatar_in_city.world)
            can_start, reason = action.can_start("铁矿石")
            
            assert can_start is False
            assert "不出售" in reason

def test_buy_fail_not_in_city(dummy_avatar, mock_item_data):
    """测试不在城市无法购买"""
    elixirs_mock = mock_item_data["elixirs"]
    materials_mock = mock_item_data["materials"]
    
    # 确保不在城市 (dummy_avatar 默认在 (0,0) PLAIN)
    assert not isinstance(dummy_avatar.tile.region, CityRegion)
    
    with patch("src.utils.resolution.elixirs_by_name", elixirs_mock), \
         patch("src.utils.resolution.materials_by_name", materials_mock):
        
        action = Buy(dummy_avatar, dummy_avatar.world)
        can_start, reason = action.can_start("铁矿石")
        
        assert can_start is False
        assert "仅能在城市" in reason

def test_buy_fail_no_money(avatar_in_city, mock_item_data):
    """测试没钱无法购买"""
    elixirs_mock = mock_item_data["elixirs"]
    materials_mock = mock_item_data["materials"]
    
    avatar_in_city.magic_stone = 0 # 没钱
    
    with patch.object(avatar_in_city.tile.region, 'is_selling', return_value=True):
        with patch("src.utils.resolution.elixirs_by_name", elixirs_mock), \
             patch("src.utils.resolution.materials_by_name", materials_mock):
            
            action = Buy(avatar_in_city, avatar_in_city.world)
            can_start, reason = action.can_start("铁矿石")
            
            assert can_start is False
            assert "灵石不足" in reason

def test_buy_fail_unknown_item(avatar_in_city, mock_item_data):
    """测试未知物品"""
    elixirs_mock = mock_item_data["elixirs"]
    materials_mock = mock_item_data["materials"]
    
    with patch("src.utils.resolution.elixirs_by_name", elixirs_mock), \
         patch("src.utils.resolution.materials_by_name", materials_mock):
        
        action = Buy(avatar_in_city, avatar_in_city.world)
        can_start, reason = action.can_start("不存在的东西")
        
        assert can_start is False
        assert "未知物品" in reason

def test_buy_elixir_fail_high_level_restricted(avatar_in_city, mock_item_data):
    """测试购买高阶丹药被限制"""
    elixirs_mock = mock_item_data["elixirs"]
    materials_mock = mock_item_data["materials"]
    high_level_elixir = mock_item_data["obj_high_elixir"]
    
    # 给予足够金钱
    avatar_in_city.magic_stone = 10000
    
    # 角色是练气期，尝试买筑基期丹药
    assert avatar_in_city.cultivation_progress.realm == Realm.Qi_Refinement
    assert high_level_elixir.realm == Realm.Foundation_Establishment
    
    with patch.object(avatar_in_city.tile.region, 'is_selling', return_value=True):
        with patch("src.utils.resolution.elixirs_by_name", elixirs_mock), \
             patch("src.utils.resolution.materials_by_name", materials_mock):
            
            action = Buy(avatar_in_city, avatar_in_city.world)
            can_start, reason = action.can_start("筑基丹")
            
            assert can_start is False
            # 错误信息变了，现在是通用的境界限制
            assert "境界不足" in reason

def test_buy_elixir_fail_duplicate_active(avatar_in_city, mock_item_data):
    """测试药效尚存无法重复购买"""
    elixirs_mock = mock_item_data["elixirs"]
    materials_mock = mock_item_data["materials"]
    test_elixir = mock_item_data["obj_elixir"]
    
    # 先服用一个
    consumed = ConsumedElixir(test_elixir, int(avatar_in_city.world.month_stamp))
    
    avatar_in_city.elixirs.append(consumed)
    
    with patch.object(avatar_in_city.tile.region, 'is_selling', return_value=True):
        with patch("src.utils.resolution.elixirs_by_name", elixirs_mock), \
             patch("src.utils.resolution.materials_by_name", materials_mock):
            
            action = Buy(avatar_in_city, avatar_in_city.world)
            can_start, reason = action.can_start("聚气丹")
            
            assert can_start is False
            assert "药效尚存" in reason

def test_buy_weapon_trade_in(avatar_in_city, mock_item_data):
    """测试购买新武器时自动卖出旧武器"""
    # 这里需要构造一个旧武器，mock_item_data里只有一套新武器
    from tests.conftest import create_test_weapon
    from src.classes.weapon import Weapon, WeaponType
    
    elixirs_mock = mock_item_data["elixirs"]
    materials_mock = mock_item_data["materials"]
    new_weapon = mock_item_data["obj_weapon"]
    
    materials_mock["青云剑"] = new_weapon
    
    # 构造旧武器
    old_weapon = create_test_weapon("铁剑", Realm.Qi_Refinement, weapon_id=199)
    old_weapon.effects = {'atk': 1}
    
    # 装备旧武器
    avatar_in_city.change_weapon(old_weapon)
    assert avatar_in_city.weapon == old_weapon
    
    initial_money = avatar_in_city.magic_stone
    
    # 价格计算
    # 练气期 Weapon Base Price = 150 (refer to src/classes/prices.py)
    # 买入: 150 * 1.5 = 225
    buy_cost = 225
    # 卖出: 150 * 1.0 = 150
    sell_refund = 150
    
    expected_money = initial_money - buy_cost + sell_refund
    
    with patch.object(avatar_in_city.tile.region, 'is_selling', return_value=True):
        with patch("src.utils.resolution.elixirs_by_name", elixirs_mock), \
             patch("src.utils.resolution.materials_by_name", materials_mock):
             
            action = Buy(avatar_in_city, avatar_in_city.world)
            
            # 验证 Event 描述
            event = action.start("青云剑")
            assert "青云剑" in event.content
            assert "铁剑" in event.content
            assert "折价售出" in event.content
            
            # 执行购买
            action._execute("青云剑")
            
            assert avatar_in_city.weapon.name == "青云剑"
            assert avatar_in_city.weapon != old_weapon
            assert avatar_in_city.magic_stone == expected_money