using System;
using IvfTl.ControlHost.Debug;
using IvfTl.ControlHost.Tests.Fakes;
using Xunit;

namespace IvfTl.ControlHost.Tests
{
    /// <summary>
    /// D2-02 Task3.2a：CalibrationManager 的 sid 校验路径(不触真实硬件标定)。
    /// 真实标定要硬件,这里只断言会话校验/字典管理的纯逻辑分支:
    ///   · 不存在的 sid → StartCalibrate / GetProgress / Recalibrate 返回 SESSION_EXPIRED;
    ///   · Stop 未知 sid 幂等返回 Okay;
    ///   · houseBinOf 委托在 SESSION_EXPIRED 路径上绝不被调用(closure 未进入)。
    /// </summary>
    public class CalibrationManagerTests
    {
        private DateTime _now = new DateTime(2026, 6, 25, 0, 0, 0);

        private (CalibrationManager calib, DebugSessionManager debug, bool[] houseBinTouched) New()
        {
            var serial = new FakeSerial();
            var gate = new FakeGate(7, serial) { CanAcquire = true };
            var debug = new DebugSessionManager(sn => gate, () => _now, ttlMs: 10000, log: _ => { });
            var touched = new bool[1];
            // houseBinOf：SESSION_EXPIRED 路径下绝不应被调用;被调用则置标志,便于断言。
            var calib = new CalibrationManager(debug, sn => { touched[0] = true; return null; }, log: _ => { });
            return (calib, debug, touched);
        }

        [Fact]
        public void StartCalibrate_Unknown_Sid_Returns_SESSION_EXPIRED_Without_Touching_HouseBin()
        {
            var (calib, _, touched) = New();
            var r = calib.StartCalibrate("not-a-session", null);
            Assert.False(r.Ok);
            Assert.Equal("SESSION_EXPIRED", r.Code);
            Assert.False(touched[0]);   // 会话校验先于取 HouseBin,委托不被触发
        }

        [Fact]
        public void GetProgress_Unknown_Sid_Returns_SESSION_EXPIRED()
        {
            var (calib, _, _) = New();
            var r = calib.GetProgress("nope");
            Assert.False(r.Ok);
            Assert.Equal("SESSION_EXPIRED", r.Code);
        }

        [Fact]
        public void Recalibrate_Unknown_Sid_Returns_SESSION_EXPIRED()
        {
            var (calib, _, _) = New();
            var r = calib.Recalibrate("nope", 3);
            Assert.False(r.Ok);
            Assert.Equal("SESSION_EXPIRED", r.Code);
        }

        [Fact]
        public void Stop_Unknown_Sid_Is_Idempotent_Ok()
        {
            var (calib, _, _) = New();
            Assert.True(calib.Stop("nope").Ok);
            Assert.True(calib.Stop(null).Ok);
        }

        // Critical 并发修复:StopAndWait 对未起标定的 sid 是 no-op 且返回 true,
        // 让 DebugSessionManager 的"会话即将关闭"回调即便该会话没在标定也能畅通(不阻塞 Dispose)。
        [Fact]
        public void StopAndWait_Unknown_Sid_Is_NoOp_ReturnsTrue()
        {
            var (calib, _, _) = New();
            Assert.True(calib.StopAndWait("nope", 1000));
            Assert.True(calib.StopAndWait(null, 1000));
        }

        // ── Task3.2b：标定预览帧缓冲的「非标定/无帧」安全分支(推流线程据此决定走 GrabStable) ──

        [Fact]
        public void IsCalibrating_NoSession_Returns_False()
        {
            // 无活跃协作器(未起标定)→ IsCalibrating=false → 推流线程走原 GrabStable 分支(行为零变化)。
            var (calib, _, _) = New();
            Assert.False(calib.IsCalibrating("nope"));
            Assert.False(calib.IsCalibrating(null));
        }

        [Fact]
        public void TryGetLatestFrame_NoFrame_Returns_False_And_Empty_Out()
        {
            // 未标定/无缓冲帧 → TryGetLatestFrame=false 且 out 全空;
            // 推流线程标定中遇此会跳过等下一帧、绝不 GrabStable(不争相机锁)。
            var (calib, _, _) = New();
            Assert.False(calib.TryGetLatestFrame("nope", out var bgr, out var w, out var h));
            Assert.Null(bgr);
            Assert.Equal(0, w);
            Assert.Equal(0, h);
            Assert.False(calib.TryGetLatestFrame(null, out _, out _, out _));
        }
    }
}