using System;
using System.Threading;
using IvfTl.Hardware.HilTests.Infrastructure;
using IvfTl.Hardware.Impl;
using Xunit;
using Xunit.Abstractions;

namespace IvfTl.Hardware.HilTests
{
    /// <summary>
    /// M-01/02/03 防回归:写命令(排气阀时间/灯光亮度)真下发到下位机,读回随写变化,写后立即恢复原值(非破坏)。
    /// 安全口径:默认 Skip(零写入);仅环境变量 HIL_ALLOW_WRITE=1 才执行。全程仅 EEPROM,无电机。
    /// </summary>
    [Collection("HIL")]
    public class EepromWriteHilTests
    {
        private readonly HardwareRigFixture _rig;
        private readonly ITestOutputHelper _out;
        public EepromWriteHilTests(HardwareRigFixture rig, ITestOutputHelper o) { _rig = rig; _out = o; }

        private static bool WriteAllowed =>
            Environment.GetEnvironmentVariable("HIL_ALLOW_WRITE") == "1";

        [SkippableFact]
        public void WriteVentTime_RoundTrips_AndRestoresOriginal()
        {
            Skip.IfNot(WriteAllowed, "写路径默认关闭;设 HIL_ALLOW_WRITE=1 才跑(写后立即恢复原值)");
            RoundTrip("排气阀时间(M-01写/M-02读)",
                ch => ch.ReadOpenVentTimeWait(), (ch, v) => ch.WriteOpenVentTimeWait(v));
        }

        [SkippableFact]
        public void WriteLightBrightness_RoundTrips_AndRestoresOriginal()
        {
            Skip.IfNot(WriteAllowed, "写路径默认关闭;设 HIL_ALLOW_WRITE=1 才跑(写后立即恢复原值)");
            RoundTrip("灯光亮度(M-03写)",
                ch => ch.ReadLightBrightnessWait(), (ch, v) => ch.WriteLightBrightnessWait(v));
        }

        private void RoundTrip(string label, Func<SerialChannelImpl, int> read, Action<SerialChannelImpl, int> write)
        {
            Skip.If(_rig.FirstChamberWithWells() == null, "无响应真舱:无硬件 / control 正占用串口 / 未连接");

            // 逐舱(排除舱11)找到第一个能读到该项的真舱再验:不同舱配置不同 E方,
            // 单一固定舱可能无此项(如灯光),逐舱试避免漏验该命令(对齐原 harness 取证逻辑)。
            foreach (var chamber in _rig.Chambers)
            {
                if (chamber.HouseSn == 11) continue; // 缓冲瓶/总控,无舱室排气阀/灯光
                SerialChannelImpl ch = null;
                try
                {
                    ch = new SerialChannelImpl(0, chamber.Port);
                    if (!ch.Open()) continue;

                    // 读前丢弃一帧 + 间隔排空(隔离任何尾噪声),拿稳定原值。
                    int ReadStable()
                    {
                        try { read(ch); } catch { }
                        Thread.Sleep(700);
                        int a = read(ch);
                        Thread.Sleep(700);
                        return a;
                    }

                    int v0 = ReadStable();
                    if (v0 < 0) { _out.WriteLine($"[{label}] 舱{chamber.HouseSn} 无此项(读={v0}),试下一舱"); continue; }
                    _out.WriteLine($"[{label}] 舱{chamber.HouseSn} 原值 V0={v0}");

                    int target = v0 + 1;
                    write(ch, target); Thread.Sleep(700);
                    int v1 = ReadStable();
                    _out.WriteLine($"[{label}] 写 {target} 后读回={v1}");

                    write(ch, v0); Thread.Sleep(700);   // 恢复原值
                    int v2 = ReadStable();
                    _out.WriteLine($"[{label}] 写回 {v0} 后读回={v2}");

                    Assert.Equal(target, v1); // 写真下发:读回随写变化
                    Assert.Equal(v0, v2);     // 已恢复原值:非破坏
                    return;                   // 已在该舱取得证据
                }
                finally { try { ch?.Close(); } catch { } }
            }

            Skip.If(true, $"[{label}] 所有真舱均无此项,无法取证(非失败)");
        }
    }
}