"""绿幕抠像引擎单元测试 - 配置解析等纯逻辑."""

from __future__ import annotations

import pytest
from video_processing.chroma_key_engine import (
    CHROMA_KEY_PRESETS,
    ChromaKeyConfig,
)


class TestChromaKeyConfigDefaults:
    """默认配置测试."""

    def test_default_values(self):
        """默认值正确."""
        config = ChromaKeyConfig()
        assert config.enabled is False
        assert config.key_color == "#00FF00"
        assert config.similarity == 0.3
        assert config.blend == 0.1
        assert config.spill_suppress == 0.0


class TestChromaKeyConfigFromDict:
    """from_dict 配置解析测试."""

    def test_none_returns_disabled(self):
        """None 返回禁用配置."""
        config = ChromaKeyConfig.from_dict(None)
        assert config.enabled is False

    def test_empty_dict_returns_disabled(self):
        """空字典返回禁用."""
        config = ChromaKeyConfig.from_dict({})
        assert config.enabled is False

    def test_disabled_returns_disabled(self):
        """enabled=False 返回禁用."""
        config = ChromaKeyConfig.from_dict({"enabled": False})
        assert config.enabled is False

    def test_enabled_default_values(self):
        """启用时使用默认参数."""
        config = ChromaKeyConfig.from_dict({"enabled": True})
        assert config.enabled is True
        assert config.key_color == "#00FF00"
        assert config.similarity == 0.3
        assert config.blend == 0.1
        assert config.spill_suppress == 0.0

    def test_custom_key_color(self):
        """自定义抠像颜色."""
        config = ChromaKeyConfig.from_dict(
            {
                "enabled": True,
                "key_color": "#0000FF",
            }
        )
        assert config.key_color == "#0000FF"

    def test_similarity_parsed(self):
        """相似度解析."""
        config = ChromaKeyConfig.from_dict(
            {
                "enabled": True,
                "similarity": 0.5,
            }
        )
        assert config.similarity == 0.5

    def test_similarity_clamped_min(self):
        """相似度下限钳制."""
        config = ChromaKeyConfig.from_dict(
            {
                "enabled": True,
                "similarity": 0.001,
            }
        )
        assert config.similarity == 0.01

    def test_similarity_clamped_max(self):
        """相似度上限钳制."""
        config = ChromaKeyConfig.from_dict(
            {
                "enabled": True,
                "similarity": 2.0,
            }
        )
        assert config.similarity == 1.0

    def test_blend_clamped_min(self):
        """混合度下限钳制."""
        config = ChromaKeyConfig.from_dict(
            {
                "enabled": True,
                "blend": -0.5,
            }
        )
        assert config.blend == 0.0

    def test_blend_clamped_max(self):
        """混合度上限钳制."""
        config = ChromaKeyConfig.from_dict(
            {
                "enabled": True,
                "blend": 1.5,
            }
        )
        assert config.blend == 1.0

    def test_spill_suppress_clamped(self):
        """溢色抑制钳制."""
        config = ChromaKeyConfig.from_dict(
            {
                "enabled": True,
                "spill_suppress": 2.0,
            }
        )
        assert config.spill_suppress == 1.0

    def test_invalid_similarity_falls_back(self):
        """无效相似度回退到默认."""
        config = ChromaKeyConfig.from_dict(
            {
                "enabled": True,
                "similarity": "not_a_number",
            }
        )
        assert config.similarity == 0.3

    def test_invalid_blend_falls_back(self):
        """无效混合度回退."""
        config = ChromaKeyConfig.from_dict(
            {
                "enabled": True,
                "blend": "high",
            }
        )
        assert config.blend == 0.1

    def test_key_color_stripped(self):
        """颜色值去除首尾空格."""
        config = ChromaKeyConfig.from_dict(
            {
                "enabled": True,
                "key_color": "  #FF0000  ",
            }
        )
        assert config.key_color == "#FF0000"

    def test_all_params_custom(self):
        """所有参数自定义."""
        config = ChromaKeyConfig.from_dict(
            {
                "enabled": True,
                "key_color": "#0000FF",
                "similarity": 0.45,
                "blend": 0.15,
                "spill_suppress": 0.6,
            }
        )
        assert config.enabled is True
        assert config.key_color == "#0000FF"
        assert config.similarity == 0.45
        assert config.blend == 0.15
        assert config.spill_suppress == 0.6


class TestHasEffect:
    """has_effect 方法测试."""

    def test_disabled_no_effect(self):
        """禁用时无效果."""
        config = ChromaKeyConfig(enabled=False)
        assert config.has_effect() is False

    def test_enabled_with_similarity_has_effect(self):
        """启用且有相似度时有效果."""
        config = ChromaKeyConfig(enabled=True, similarity=0.3)
        assert config.has_effect() is True

    def test_zero_similarity_no_effect(self):
        """相似度为0时无效果."""
        config = ChromaKeyConfig(enabled=True, similarity=0.0)
        assert config.has_effect() is False


class TestChromaKeyPresets:
    """预设配置测试."""

    def test_five_presets(self):
        """5个预设."""
        assert len(CHROMA_KEY_PRESETS) == 5

    def test_preset_names(self):
        """预设名称正确."""
        assert "green_screen" in CHROMA_KEY_PRESETS
        assert "blue_screen" in CHROMA_KEY_PRESETS
        assert "red_screen" in CHROMA_KEY_PRESETS
        assert "precise_green" in CHROMA_KEY_PRESETS
        assert "soft_green" in CHROMA_KEY_PRESETS

    def test_presets_have_required_keys(self):
        """每个预设包含必要字段."""
        for name, preset in CHROMA_KEY_PRESETS.items():
            assert "key_color" in preset, f"{name} missing key_color"
            assert "similarity" in preset, f"{name} missing similarity"
            assert "blend" in preset, f"{name} missing blend"
            assert "spill_suppress" in preset, f"{name} missing spill_suppress"