using HarmonyLib;
using Monitor;
using System;
using System.Collections.Generic;
using System.Reflection;
using System.Reflection.Emit;

namespace UnlockFrameRate;

[HarmonyPatch(typeof(NoteBase), "GetMaiBugAdjustMSec")]
internal class PatchGetMaiBugAdjustMSec
{
    private const float OriginalFrameRate = 60f;

    private static IEnumerable<CodeInstruction> Transpiler(IEnumerable<CodeInstruction> instructions, MethodBase __originalMethod)
    {
        var i = 0;

        foreach (var instruction in instructions)
        {
            if (instruction.opcode != OpCodes.Ldc_R4 || instruction.operand is not float operand)
            {
                yield return instruction;
                i++;
                continue;
            }

            if (Math.Abs(operand - OriginalFrameRate) < float.Epsilon)
            {
                instruction.operand = (float)FrameRatePlugin.Instance.TargetFrameRate;
                FrameRatePlugin.Logger.LogDebug(
                    "Overrode constant at opcode index {0} in {1}: {2} => {3}",
                    i,
                    __originalMethod.Name,
                    operand,
                    instruction.operand);
            }

            yield return instruction;
            i++;
        }
    }
}