"""
YAML 加载器单元测试

测试 load_yaml_file、validate_presentation_yaml 和 validate_template_yaml 函数
"""

import pytest
from pathlib import Path
from loaders.yaml_loader import (
    load_yaml_file, validate_presentation_yaml,
    validate_template_yaml, YAMLError
)


class TestLoadYamlFile:
    """load_yaml_file 函数测试类"""

    def test_load_valid_yaml(self, sample_yaml):
        """测试加载有效的 YAML 文件"""
        data = load_yaml_file(sample_yaml)
        assert isinstance(data, dict)
        assert "slides" in data

    def test_load_nonexistent_file(self, temp_dir):
        """测试加载不存在的文件"""
        nonexistent = temp_dir / "nonexistent.yaml"
        with pytest.raises(YAMLError, match="文件不存在"):
            load_yaml_file(nonexistent)

    def test_load_directory_raises_error(self, temp_dir):
        """测试加载目录会引发错误"""
        with pytest.raises(YAMLError, match="不是有效的文件"):
            load_yaml_file(temp_dir)

    def test_load_yaml_with_syntax_error(self, temp_dir):
        """测试加载包含语法错误的 YAML"""
        invalid_file = temp_dir / "invalid.yaml"
        invalid_file.write_text("key: [unclosed list")
        with pytest.raises(YAMLError, match="YAML 语法错误"):
            load_yaml_file(invalid_file)

    def test_load_utf8_content(self, temp_dir):
        """测试加载 UTF-8 编码的内容"""
        utf8_file = temp_dir / "utf8.yaml"
        utf8_file.write_text("key: '中文内容'", encoding='utf-8')
        data = load_yaml_file(utf8_file)
        assert data["key"] == "中文内容"


class TestValidatePresentationYaml:
    """validate_presentation_yaml 函数测试类"""

    def test_valid_presentation_structure(self):
        """测试有效的演示文稿结构"""
        data = {
            "metadata": {"size": "16:9"},
            "slides": [{"elements": []}]
        }
        # 不应该引发错误
        validate_presentation_yaml(data)

    def test_missing_slides_field(self):
        """测试缺少 slides 字段"""
        data = {"metadata": {"size": "16:9"}}
        with pytest.raises(YAMLError, match="缺少必需字段 'slides'"):
            validate_presentation_yaml(data)

    def test_slides_not_a_list(self):
        """测试 slides 不是列表"""
        data = {"slides": "not a list"}
        with pytest.raises(YAMLError, match="'slides' 必须是一个列表"):
            validate_presentation_yaml(data)

    def test_not_a_dict(self):
        """测试不是字典"""
        data = "not a dict"
        with pytest.raises(YAMLError, match="必须是一个字典对象"):
            validate_presentation_yaml(data)

    def test_empty_slides_list(self):
        """测试空的 slides 列表"""
        data = {"slides": []}
        # 空列表是有效的
        validate_presentation_yaml(data)

    def test_with_file_path_in_error(self):
        """测试错误消息包含文件路径"""
        data = {"not_slides": []}
        with pytest.raises(YAMLError) as exc_info:
            validate_presentation_yaml(data, "test.yaml")
        assert "test.yaml" in str(exc_info.value)


class TestValidateTemplateYaml:
    """validate_template_yaml 函数测试类"""

    def test_valid_template_structure(self):
        """测试有效的模板结构"""
        data = {
            "vars": [
                {"name": "title", "required": True}
            ],
            "elements": []
        }
        # 不应该引发错误
        validate_template_yaml(data)

    def test_missing_elements_field(self):
        """测试缺少 elements 字段"""
        data = {"vars": []}
        with pytest.raises(YAMLError, match="缺少必需字段 'elements'"):
            validate_template_yaml(data)

    def test_elements_not_a_list(self):
        """测试 elements 不是列表"""
        data = {"elements": "not a list"}
        with pytest.raises(YAMLError, match="'elements' 必须是一个列表"):
            validate_template_yaml(data)

    def test_vars_not_a_list(self):
        """测试 vars 不是列表"""
        data = {
            "vars": "not a list",
            "elements": []
        }
        with pytest.raises(YAMLError, match="'vars' 必须是一个列表"):
            validate_template_yaml(data)

    def test_var_item_not_a_dict(self):
        """测试变量项不是字典"""
        data = {
            "vars": ["not a dict"],
            "elements": []
        }
        with pytest.raises(YAMLError, match="必须是一个字典对象"):
            validate_template_yaml(data)

    def test_var_item_missing_name(self):
        """测试变量项缺少 name 字段"""
        data = {
            "vars": [{"required": True}],
            "elements": []
        }
        with pytest.raises(YAMLError, match="缺少必需字段 'name'"):
            validate_template_yaml(data)

    def test_template_without_vars(self):
        """测试没有 vars 的模板"""
        data = {"elements": []}
        # vars 是可选的
        validate_template_yaml(data)

    def test_not_a_dict(self):
        """测试不是字典"""
        data = "not a dict"
        with pytest.raises(YAMLError, match="必须是一个字典对象"):
            validate_template_yaml(data)


class TestYAMLError:
    """YAMLError 异常测试类"""

    def test_is_an_exception(self):
        """测试 YAMLError 是异常类"""
        error = YAMLError("Test error")
        assert isinstance(error, Exception)

    def test_can_be_raised_and_caught(self):
        """测试可以被引发和捕获"""
        with pytest.raises(YAMLError):
            raise YAMLError("Test")