using NUnit.Framework;
using ProjectM.Client;
using UnityEngine;

namespace ProjectM.Tests
{
    /// <summary>
    /// Pure-logic tests for the client settings model (no ECS world): JSON round-trip via JsonUtility,
    /// defensive clamping of hand-edited/corrupt values, and the GameVolume bus statics. Engine APIs
    /// (Screen/QualitySettings) resolve in EditMode, so Defaults()/Clamped() are exercisable here.
    /// </summary>
    public class GameSettingsTests
    {
        static GameSettings Sample() => new GameSettings
        {
            Version = GameSettings.CurrentVersion,
            ResWidth = 2560,
            ResHeight = 1440,
            RefreshHz = 144,
            FullScreenMode = (int)FullScreenMode.ExclusiveFullScreen,
            QualityLevel = 0,
            VSync = 2,
            TargetFps = 120,
            Master = 0.8f,
            Music = 0.5f,
            Sfx = 0.3f,
        };

        [Test]
        public void Json_RoundTrip_PreservesAllFields()
        {
            var src = Sample();
            var json = JsonUtility.ToJson(src);
            var dst = JsonUtility.FromJson<GameSettings>(json);

            Assert.AreEqual(src.Version, dst.Version);
            Assert.AreEqual(src.ResWidth, dst.ResWidth);
            Assert.AreEqual(src.ResHeight, dst.ResHeight);
            Assert.AreEqual(src.RefreshHz, dst.RefreshHz);
            Assert.AreEqual(src.FullScreenMode, dst.FullScreenMode);
            Assert.AreEqual(src.QualityLevel, dst.QualityLevel);
            Assert.AreEqual(src.VSync, dst.VSync);
            Assert.AreEqual(src.TargetFps, dst.TargetFps);
            Assert.AreEqual(src.Master, dst.Master, 1e-5f);
            Assert.AreEqual(src.Music, dst.Music, 1e-5f);
            Assert.AreEqual(src.Sfx, dst.Sfx, 1e-5f);
        }

        [Test]
        public void Clamped_BoundsOutOfRangeValues()
        {
            var bad = new GameSettings
            {
                ResWidth = 99999, ResHeight = -5, RefreshHz = -10,
                FullScreenMode = 99, QualityLevel = 9999, VSync = 7,
                TargetFps = 5, Master = 2f, Music = -1f, Sfx = 3f,
            };
            var c = bad.Clamped();

            Assert.LessOrEqual(c.ResWidth, 7680);
            Assert.GreaterOrEqual(c.ResHeight, 480);
            Assert.GreaterOrEqual(c.RefreshHz, 0);
            Assert.That(c.FullScreenMode, Is.InRange(0, 3));
            Assert.That(c.VSync, Is.InRange(0, 2));
            Assert.AreEqual(1f, c.Master, 1e-5f);   // 2f -> 1
            Assert.AreEqual(0f, c.Music, 1e-5f);    // -1 -> 0
            Assert.AreEqual(1f, c.Sfx, 1e-5f);      // 3f -> 1
            Assert.That(c.QualityLevel, Is.GreaterThanOrEqualTo(0)); // clamped to a valid level index
        }

        [Test]
        public void Clamped_NonPositiveTargetFps_BecomesUncapped()
        {
            Assert.AreEqual(-1, new GameSettings { TargetFps = 0 }.Clamped().TargetFps);
            Assert.AreEqual(-1, new GameSettings { TargetFps = -50 }.Clamped().TargetFps);
            Assert.AreEqual(120, new GameSettings { TargetFps = 120, Master = 1f }.Clamped().TargetFps);
        }

        [Test]
        public void Defaults_AreValidAndFullVolume()
        {
            var d = GameSettings.Defaults();
            Assert.AreEqual(GameSettings.CurrentVersion, d.Version);
            Assert.Greater(d.ResWidth, 0);
            Assert.Greater(d.ResHeight, 0);
            Assert.AreEqual(1f, d.Master, 1e-5f);
            Assert.AreEqual(1f, d.Music, 1e-5f);
            Assert.AreEqual(1f, d.Sfx, 1e-5f);
            // Defaults survive a clamp unchanged (they are in-range by construction).
            var c = d.Clamped();
            Assert.AreEqual(d.Master, c.Master, 1e-5f);
            Assert.AreEqual(d.VSync, c.VSync);
        }

        [Test]
        public void GameVolume_BusesAreSettable_DefaultFull()
        {
            float prevMusic = GameVolume.Music, prevSfx = GameVolume.Sfx;
            try
            {
                GameVolume.Music = 0.25f;
                GameVolume.Sfx = 0.6f;
                Assert.AreEqual(0.25f, GameVolume.Music, 1e-5f);
                Assert.AreEqual(0.6f, GameVolume.Sfx, 1e-5f);
            }
            finally
            {
                GameVolume.Music = prevMusic;
                GameVolume.Sfx = prevSfx;
            }
        }
    }
}