"""XlsParser 单元测试"""

import pytest
import xlwt

from exceptions import ParseError
from parsers.xls_parser import XlsParser


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


def _create_xls(path, sheets=None):
    """
    创建测试用 XLS 文件。

    Args:
        path: 输出文件路径
        sheets: dict，key 为 sheet 名称，value 为二维列表（行×列的数据）
                如果为 None，创建空工作簿
    """
    wb = xlwt.Workbook()

    if sheets:
        for sheet_name, rows in sheets.items():
            ws = wb.add_sheet(sheet_name)
            for row_idx, row in enumerate(rows):
                for col_idx, value in enumerate(row):
                    ws.write(row_idx, col_idx, value)
    else:
        # xlwt 需要至少一个 sheet
        wb.add_sheet("Sheet1")

    wb.save(str(path))


class TestSupportedExtensions:
    def test_supports_xls(self, parser):
        assert ".xls" in parser.supported_extensions()

    def test_only_one_extension(self, parser):
        assert len(parser.supported_extensions()) == 1


class TestParse:
    def test_simple_table(self, parser, tmp_path):
        """基本表格转换为 Markdown"""
        xls_path = tmp_path / "simple.xls"
        _create_xls(xls_path, {
            "Sheet1": [
                ["Name", "Age"],
                ["Alice", 30],
                ["Bob", 25],
            ]
        })
        result = parser.parse(str(xls_path))
        assert "## Sheet1" in result
        assert "| Name | Age |" in result
        assert "| --- | --- |" in result
        assert "Alice" in result
        assert "Bob" in result

    def test_multiple_sheets(self, parser, tmp_path):
        """多个工作表各自生成标题和表格"""
        xls_path = tmp_path / "multi.xls"
        _create_xls(xls_path, {
            "Users": [["Name"], ["Alice"]],
            "Orders": [["ID"], ["001"]],
        })
        result = parser.parse(str(xls_path))
        assert "## Users" in result
        assert "## Orders" in result
        assert "| Name |" in result
        assert "| ID |" in result

    def test_empty_sheet_skipped(self, parser, tmp_path):
        """空工作表应被跳过"""
        xls_path = tmp_path / "empty_sheet.xls"
        wb = xlwt.Workbook()
        wb.add_sheet("Empty")  # no data written
        ws = wb.add_sheet("Data")
        ws.write(0, 0, "Col1")
        ws.write(1, 0, "Val1")
        wb.save(str(xls_path))

        result = parser.parse(str(xls_path))
        assert "## Empty" not in result
        assert "## Data" in result

    def test_pipe_escaped(self, parser, tmp_path):
        """单元格中的 | 应被转义为 |"""
        xls_path = tmp_path / "pipe.xls"
        _create_xls(xls_path, {
            "Sheet1": [["Header"], ["value|with|pipes"]],
        })
        result = parser.parse(str(xls_path))
        assert "|" in result
        assert "value|with|pipes" in result

    def test_newline_escaped(self, parser, tmp_path):
        """单元格中的换行符应被转义为 <br>"""
        xls_path = tmp_path / "newline.xls"
        _create_xls(xls_path, {
            "Sheet1": [["Header"], ["line1\nline2"]],
        })
        result = parser.parse(str(xls_path))
        assert "line1<br>line2" in result

    def test_backtick_escaped(self, parser, tmp_path):
        """单元格中的反引号应被转义为 &#96;"""
        xls_path = tmp_path / "backtick.xls"
        _create_xls(xls_path, {
            "Sheet1": [["Header"], ["code `snippet`"]],
        })
        result = parser.parse(str(xls_path))
        assert "&#96;" in result

    def test_empty_cell_becomes_empty(self, parser, tmp_path):
        """空单元格应显示为空字符串"""
        xls_path = tmp_path / "empty_cell.xls"
        wb = xlwt.Workbook()
        ws = wb.add_sheet("Sheet1")
        ws.write(0, 0, "A")
        ws.write(0, 1, "B")
        ws.write(1, 0, "val")
        # cell (1,1) is not written — will be empty
        wb.save(str(xls_path))

        result = parser.parse(str(xls_path))
        assert "| val |  |" in result

    def test_sheet_name_as_heading(self, parser, tmp_path):
        """工作表名称应作为 ## 标题"""
        xls_path = tmp_path / "named.xls"
        _create_xls(xls_path, {
            "Sales Report": [["Month", "Revenue"], ["Jan", "1000"]],
        })
        result = parser.parse(str(xls_path))
        assert "## Sales Report" in result

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

    def test_corrupted_file_raises(self, parser, tmp_path):
        xls_path = tmp_path / "corrupted.xls"
        xls_path.write_bytes(b"this is not an xls file")
        with pytest.raises(ParseError) as exc_info:
            parser.parse(str(xls_path))
        assert "corrupted.xls" in exc_info.value.file_name

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

    def test_numeric_values(self, parser, tmp_path):
        """数值类型应正确转换为字符串"""
        xls_path = tmp_path / "numeric.xls"
        _create_xls(xls_path, {
            "Sheet1": [["Int", "Float"], [42, 3.14]],
        })
        result = parser.parse(str(xls_path))
        assert "42" in result
        assert "3.14" in result

    def test_crlf_escaped(self, parser, tmp_path):
        """\\r\\n 应被转义为 <br>"""
        xls_path = tmp_path / "crlf.xls"
        _create_xls(xls_path, {
            "Sheet1": [["Header"], ["line1\r\nline2"]],
        })
        result = parser.parse(str(xls_path))
        assert "line1<br>line2" in result