"""
工具函数单元测试

测试颜色转换和格式验证函数
"""

import pytest
from utils import hex_to_rgb


class TestHexToRgb:
    """hex_to_rgb 函数测试类"""

    def test_full_hex_format(self):
        """测试完整的 #RRGGBB 格式"""
        assert hex_to_rgb("#ffffff") == (255, 255, 255)
        assert hex_to_rgb("#000000") == (0, 0, 0)
        assert hex_to_rgb("#4a90e2") == (74, 144, 226)
        assert hex_to_rgb("#FF0000") == (255, 0, 0)
        assert hex_to_rgb("#00FF00") == (0, 255, 0)
        assert hex_to_rgb("#0000FF") == (0, 0, 255)

    def test_short_hex_format(self):
        """测试短格式 #RGB"""
        assert hex_to_rgb("#fff") == (255, 255, 255)
        assert hex_to_rgb("#000") == (0, 0, 0)
        assert hex_to_rgb("#abc") == (170, 187, 204)
        assert hex_to_rgb("#ABC") == (170, 187, 204)

    def test_without_hash_sign(self):
        """测试没有 # 号"""
        assert hex_to_rgb("ffffff") == (255, 255, 255)
        assert hex_to_rgb("4a90e2") == (74, 144, 226)

    def test_invalid_length(self):
        """测试无效长度"""
        with pytest.raises(ValueError, match="无效的颜色格式"):
            hex_to_rgb("#ff")  # 太短
        with pytest.raises(ValueError, match="无效的颜色格式"):
            hex_to_rgb("#fffff")  # 5 位
        with pytest.raises(ValueError, match="无效的颜色格式"):
            hex_to_rgb("#fffffff")  # 7 位

    def test_invalid_characters(self):
        """测试无效字符"""
        with pytest.raises(ValueError):
            hex_to_rgb("#gggggg")
        with pytest.raises(ValueError):
            hex_to_rgb("#xyz")

    def test_mixed_case(self):
        """测试大小写混合"""
        assert hex_to_rgb("#AbCdEf") == (171, 205, 239)
        assert hex_to_rgb("#aBcDeF") == (171, 205, 239)