import pytest
from pathlib import Path
from openpyxl import Workbook

from src.core.mil_data_excel import read_excel_data, get_data_log, ExcelReaderConfig
from src.core.exceptions import ExcelReadError, ExcelFormatError


def test_read_excel_data_returns_required_keys(sample_excel_path: Path):
    """验证返回结果包含必需键"""
    result = read_excel_data(sample_excel_path)
    assert "wb" in result
    assert "sheet" in result
    assert "source_row" in result


def test_read_excel_data_contains_signals(sample_excel_path: Path):
    """验证能解析出信号数据"""
    result = read_excel_data(sample_excel_path)
    signal_keys = [k for k in result.keys() if k not in ("wb", "sheet", "source_row")]
    assert len(signal_keys) > 0, "应至少包含一个信号"
    for name in signal_keys:
        assert "type" in result[name]
        assert "column" in result[name]
        assert "datalog" in result[name]


def test_read_excel_file_not_found():
    """文件不存在时抛出 ExcelReadError"""
    with pytest.raises(ExcelReadError, match="不存在"):
        read_excel_data("nonexistent.xlsx")


def test_read_excel_missing_sheet(tmp_path: Path):
    """缺少 Scenario1 表时抛出 ExcelFormatError"""
    wb = Workbook()
    wb.create_sheet("WrongSheet")
    invalid_path = tmp_path / "invalid.xlsx"
    wb.save(invalid_path)
    with pytest.raises(ExcelFormatError, match="缺少"):
        read_excel_data(invalid_path)


def test_read_excel_missing_source_header(tmp_path: Path):
    """缺少 Source: Input 标记时抛出 ExcelFormatError"""
    wb = Workbook()
    sheet = wb.active
    sheet.title = ExcelReaderConfig().sheet_name
    sheet.cell(1, 1, "time")
    sheet.cell(1, 2, "signal1")
    invalid_path = tmp_path / "missing_header.xlsx"
    wb.save(invalid_path)
    with pytest.raises(ExcelFormatError, match="缺少"):
        read_excel_data(invalid_path)


def test_datalog_is_list(sample_excel_path: Path):
    """验证 datalog 是 DataLog 对象列表"""
    result = read_excel_data(sample_excel_path)
    signal_keys = [k for k in result.keys() if k not in ("wb", "sheet", "source_row")]
    assert len(signal_keys) > 0
    first_signal = result[signal_keys[0]]
    assert len(first_signal["datalog"]) > 0
    assert hasattr(first_signal["datalog"][0], "time")
    assert hasattr(first_signal["datalog"][0], "value")


def test_get_data_log_empty_sheet():
    """空 sheet 返回空列表"""
    wb = Workbook()
    sheet = wb.active
    datalog = get_data_log(sheet, row=1, column=1)
    assert len(datalog) == 0


def test_read_excel_data_return_object(sample_excel_path: Path):
    """验证 return_object=True 时返回 ExcelDataResult 对象"""
    from src.core.base import ExcelDataResult, SignalData

    result = read_excel_data(sample_excel_path, return_object=True)
    assert isinstance(result, ExcelDataResult)
    assert result.sheet_name == "Scenario1"
    assert result.source_row > 0
    assert len(result.signals) > 0


def test_read_excel_data_signal_data_access(sample_excel_path: Path):
    """验证 ExcelDataResult 的信号访问方法"""
    from src.core.base import SignalData

    result = read_excel_data(sample_excel_path, return_object=True)
    signal_names = result.get_signal_names()
    assert len(signal_names) > 0

    first_signal_name = signal_names[0]
    signal = result.get_signal(first_signal_name)
    assert isinstance(signal, SignalData)
    assert signal.datalog is not None


def test_excel_reader_config_defaults():
    """验证 ExcelReaderConfig 默认值"""
    config = ExcelReaderConfig()
    assert config.sheet_name == "Scenario1"
    assert config.source_header == "Source: Input"
    assert config.time_column == 1
    assert config.header_row == 1
    assert config.type_row == 3
    assert config.data_start_row_offset == 1


def test_excel_reader_config_custom():
    """验证 ExcelReaderConfig 自定义值"""
    config = ExcelReaderConfig(
        sheet_name="CustomSheet",
        source_header="CustomHeader",
        time_column=2,
        header_row=2,
        type_row=4,
        data_start_row_offset=2
    )
    assert config.sheet_name == "CustomSheet"
    assert config.source_header == "CustomHeader"
    assert config.time_column == 2
    assert config.header_row == 2
    assert config.type_row == 4
    assert config.data_start_row_offset == 2


def test_read_excel_with_custom_config(tmp_path: Path):
    """验证使用自定义配置读取 Excel"""
    wb = Workbook()
    sheet = wb.active
    sheet.title = "CustomSheet"

    sheet.cell(1, 1, "time")
    sheet.cell(1, 2, "signal1")
    sheet.cell(2, 1, "CustomHeader")
    sheet.cell(2, 2, "CustomHeader")
    sheet.cell(3, 1, "Type1")
    sheet.cell(4, 1, 0.0)
    sheet.cell(4, 2, "value1")
    sheet.cell(5, 1, 1.0)
    sheet.cell(5, 2, "value2")

    custom_path = tmp_path / "custom.xlsx"
    wb.save(custom_path)

    config = ExcelReaderConfig(
        sheet_name="CustomSheet",
        source_header="CustomHeader"
    )
    result = read_excel_data(custom_path, return_object=True, config=config)
    assert result.sheet_name == "CustomSheet"
    assert "signal1" in result.signals