"""TextParser 单元测试"""

import os
import tempfile

import pytest

from exceptions import ParseError
from parsers.text_parser import TextParser


@pytest.fixture
def parser():
    return TextParser()


class TestSupportedExtensions:
    def test_supports_txt(self, parser):
        assert ".txt" in parser.supported_extensions()

    def test_supports_md(self, parser):
        assert ".md" in parser.supported_extensions()

    def test_only_two_extensions(self, parser):
        assert len(parser.supported_extensions()) == 2


class TestParse:
    def test_parse_utf8_txt(self, parser, tmp_path):
        f = tmp_path / "test.txt"
        f.write_text("Hello, world!", encoding="utf-8")
        assert parser.parse(str(f)) == "Hello, world!"

    def test_parse_utf8_md(self, parser, tmp_path):
        f = tmp_path / "readme.md"
        content = "# Title\n\nSome **bold** text."
        f.write_bytes(content.encode("utf-8"))
        assert parser.parse(str(f)) == content

    def test_parse_gbk_encoded_file(self, parser, tmp_path):
        f = tmp_path / "chinese.txt"
        # Use longer text so charset_normalizer can reliably detect GBK
        content = "你好，世界！这是一段中文文本。我们正在测试文件编码的自动检测功能，需要足够长的文本才能让检测器准确识别编码格式。"
        f.write_bytes(content.encode("gbk"))
        result = parser.parse(str(f))
        assert result == content

    def test_parse_utf8_bom(self, parser, tmp_path):
        f = tmp_path / "bom.txt"
        content = "UTF-8 with BOM"
        f.write_bytes(b"\xef\xbb\xbf" + content.encode("utf-8"))
        result = parser.parse(str(f))
        assert "UTF-8 with BOM" in result

    def test_parse_empty_file(self, parser, tmp_path):
        f = tmp_path / "empty.txt"
        f.write_bytes(b"")
        assert parser.parse(str(f)) == ""

    def test_parse_multiline(self, parser, tmp_path):
        f = tmp_path / "multi.md"
        content = "Line 1\nLine 2\nLine 3\n"
        f.write_bytes(content.encode("utf-8"))
        assert parser.parse(str(f)) == content

    def test_parse_nonexistent_file_raises(self, parser):
        with pytest.raises(ParseError) as exc_info:
            parser.parse("/nonexistent/path/file.txt")
        assert "file.txt" in exc_info.value.file_name
        assert exc_info.value.reason != ""

    def test_parse_error_contains_filename(self, parser):
        with pytest.raises(ParseError) as exc_info:
            parser.parse("/no/such/myfile.txt")
        assert exc_info.value.file_name == "myfile.txt"

    def test_parse_latin1_encoded_file(self, parser, tmp_path):
        f = tmp_path / "latin.txt"
        content = "café résumé naïve"
        f.write_bytes(content.encode("latin-1"))
        result = parser.parse(str(f))
        assert "caf" in result
        assert "sum" in result