using System.Collections.Generic;
using System.Linq;
using AibisDream.Kit;
using AibisDream.SaveSystem;
using FMOD;
using FMOD.Studio;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using NUnit.Framework;

namespace AibisDream.SystemEditor.Tests
{
    public sealed class AudioSnapshotContractTests
    {
        [Test]
        public void Registry_CapturesFinalValuesOnlyForSuccessfulParameters()
        {
            var api = new FakeFmodGlobalParameterApi();
            api.Reads["stage"] = new ParameterRead(9f, 2.37f, RESULT.OK);
            api.SetResults["missing"] = RESULT.ERR_EVENT_NOTFOUND;
            var registry = new YarnGlobalParameterRegistry(api);

            registry.SetFromYarn("stage", 9f);
            registry.SetFromYarn("STAGE", 10f);
            registry.SetFromYarn("missing", 1f);
            var snapshot = registry.CaptureFinalValues(_ => { });

            Assert.That(registry.TrackedNames, Is.EqualTo(new[] { "stage" }));
            Assert.That(snapshot["stage"], Is.EqualTo(2.37f));
            Assert.That(api.SetCalls.All(call => !call.IgnoreSeekSpeed), Is.True);
        }

        [Test]
        public void Registry_RestoreJumpsImmediatelyThenYarnUsesSeekSpeed()
        {
            var api = new FakeFmodGlobalParameterApi();
            var registry = new YarnGlobalParameterRegistry(api);

            registry.RestoreFinalValues(
                new Dictionary<string, float> { ["stage"] = 2.37f },
                _ => { });
            registry.SetFromYarn("stage", 3f);

            Assert.That(api.SetCalls, Has.Count.EqualTo(2));
            Assert.That(api.SetCalls[0].Value, Is.EqualTo(2.37f));
            Assert.That(api.SetCalls[0].IgnoreSeekSpeed, Is.True);
            Assert.That(api.SetCalls[1].Value, Is.EqualTo(3f));
            Assert.That(api.SetCalls[1].IgnoreSeekSpeed, Is.False);
        }

        [Test]
        public void AudioSnapshot_RoundTripsWithoutChangingSchema()
        {
            var source = new SaveSnapshot();
            source.sections[SnapshotProviderIds.Audio] = new AudioSnapshotDto
            {
                ambState = "Dream",
                yarnGlobalParameters = new Dictionary<string, float>
                {
                    ["reverb"] = 0.42f,
                    ["hs1LogStage"] = 2.37f
                }
            };

            var restored = JsonConvert.DeserializeObject<SaveSnapshot>(
                JsonConvert.SerializeObject(source));
            var audio = ((JObject)restored.sections[SnapshotProviderIds.Audio])
                .ToObject<AudioSnapshotDto>();

            Assert.That(restored.schemaVersion, Is.EqualTo(SaveSnapshotSchema.CurrentVersion));
            Assert.That(audio.yarnGlobalParameters["reverb"], Is.EqualTo(0.42f));
            Assert.That(audio.yarnGlobalParameters["hs1LogStage"], Is.EqualTo(2.37f));
        }

        private readonly struct SetCall
        {
            internal SetCall(float value, bool ignoreSeekSpeed)
            {
                Value = value;
                IgnoreSeekSpeed = ignoreSeekSpeed;
            }

            internal float Value { get; }
            internal bool IgnoreSeekSpeed { get; }
        }

        private readonly struct ParameterRead
        {
            internal ParameterRead(float value, float finalValue, RESULT result)
            {
                Value = value;
                FinalValue = finalValue;
                Result = result;
            }

            internal float Value { get; }
            internal float FinalValue { get; }
            internal RESULT Result { get; }
        }

        private sealed class FakeFmodGlobalParameterApi : IFmodGlobalParameterApi
        {
            internal readonly Dictionary<string, RESULT> SetResults =
                new Dictionary<string, RESULT>(System.StringComparer.OrdinalIgnoreCase);
            internal readonly Dictionary<string, ParameterRead> Reads =
                new Dictionary<string, ParameterRead>(System.StringComparer.OrdinalIgnoreCase);
            internal readonly List<SetCall> SetCalls = new List<SetCall>();

            public RESULT SetParameterByName(
                string name,
                float value,
                bool ignoreSeekSpeed)
            {
                SetCalls.Add(new SetCall(value, ignoreSeekSpeed));
                return SetResults.TryGetValue(name, out var result) ? result : RESULT.OK;
            }

            public RESULT GetParameterByName(
                string name,
                out float value,
                out float finalValue)
            {
                if (Reads.TryGetValue(name, out var read))
                {
                    value = read.Value;
                    finalValue = read.FinalValue;
                    return read.Result;
                }

                value = 0f;
                finalValue = 0f;
                return RESULT.ERR_EVENT_NOTFOUND;
            }

            public RESULT GetParameterDescriptionByName(
                string name,
                out PARAMETER_DESCRIPTION description)
            {
                description = default;
                return RESULT.ERR_EVENT_NOTFOUND;
            }

            public RESULT SetParameterById(
                PARAMETER_ID id,
                float value,
                bool ignoreSeekSpeed)
            {
                return RESULT.OK;
            }
        }
    }
}