using AxiOmron.PcbCheck.Options;
using AxiOmron.PcbCheck.Services.Implementations;
using IoTClient.Enums;
using Xunit;

namespace AxiOmron.PcbCheck.Tests;

/// <summary>
/// 验证欧姆龙 FINS PLC 服务的通信参数解析行为。
/// </summary>
public sealed class OmronFinsPlcServiceTests
{
    /// <summary>
    /// 默认字节序应使用 BADC，以匹配现场 D 区 Int16 的高低字节顺序。
    /// </summary>
    [Fact]
    public void ResolveEndianFormat_ShouldUseBadc_WhenConfigurationIsDefault()
    {
        var options = new PlcOptions();

        EndianFormat result = OmronFinsPlcService.ResolveEndianFormat(options);

        Assert.Equal(EndianFormat.BADC, result);
    }

    /// <summary>
    /// 非法字节序配置应抛出明确异常，避免使用错误端序静默读写 PLC 寄存器。
    /// </summary>
    [Fact]
    public void ResolveEndianFormat_ShouldThrow_WhenConfigurationIsInvalid()
    {
        var options = new PlcOptions
        {
            EndianFormat = "XYZ"
        };

        var exception = Assert.Throws<InvalidOperationException>(() => OmronFinsPlcService.ResolveEndianFormat(options));

        Assert.Contains("PLC 字节序配置无效", exception.Message);
    }
}