// vestige.h — clean-room VST2 (AEffect) API header (T10, spec 5.7 / spec III)
//
// QUYẾT ĐỊNH (T10): KHÔNG dùng aeffect.h/aeffectx.h chính thức (Steinberg
// ngừng license VST2 10/2018 — spec III). Viết lại từ kiến thức public của
// giao diện AEffect: struct + opcode enum đủ cho host (load, MIDI, GUI,
// processReplacing). Chỉ giữ phần host cần — không phải bản sao SDK.
//
// Nâng cấp nếu cần: thay bằng bridge có sẵn (Carla/Wine-VST) hoặc gộp JUCE.
#pragma once

#include <cstdint>
#include <stdint.h>

#define VSTCALLBACK __cdecl

#ifdef _WIN32
#define CCONST(a, b, c, d) ((int32)((d) << 24 | (c) << 16 | (b) << 8 | (a)))
#else
#define CCONST(a, b, c, d) ((int32)((a) << 24 | (b) << 16 | (c) << 8 | (d)))
#endif

typedef int32_t int32;
typedef intptr_t VstIntPtr;
typedef float VstParamValue;

//------------------------------------------------------------------------
// AEffect — layout công khai của VST2; KHÔNG đổi thứ tự field.
struct AEffect
{
    int32 magic; // kEffectMagic = CCONST('V', 's', 't', 'P')
    int32 (VSTCALLBACK* dispatcher)(AEffect*, int32 opcode, int32 index, VstIntPtr value, void* ptr, float opt);
    void (VSTCALLBACK* process)(AEffect*, float** inputs, float** outputs, int32 sampleFrames);
    void (VSTCALLBACK* setParameter)(AEffect*, int32 index, float parameter);
    float (VSTCALLBACK* getParameter)(AEffect*, int32 index);
    int32 (VSTCALLBACK* numPrograms)(AEffect*);
    int32 (VSTCALLBACK* numParams)(AEffect*);
    int32 (VSTCALLBACK* numInputs)(AEffect*);
    int32 (VSTCALLBACK* numOutputs)(AEffect*);
    int32 (VSTCALLBACK* flags)(AEffect*);
    int32 resvd1;
    int32 resvd2;
    int32 initialDelay;
    int32 realQualities;
    int32 offQualities;
    float ioRatio;
    void* object;
    void* user;
    int32 uniqueID;
    int32 version;
    void (VSTCALLBACK* processReplacing)(AEffect*, float** inputs, float** outputs, int32 sampleFrames);
    void (VSTCALLBACK* processDoubleReplacing)(AEffect*, double** inputs, double** outputs, int32 sampleFrames);
};

enum VstAEffectFlags
{
    effFlagsHasEditor = 1 << 0,
    effFlagsCanReplacing = 1 << 4,
    effFlagsProgramChunks = 1 << 5,
    effFlagsIsSynth = 1 << 8,
    effFlagsNoSoundInStop = 1 << 9,
    effFlagsCanDoubleReplacing = 1 << 12
};

//------------------------------------------------------------------------
// Dispatcher opcodes (host -> plugin)
enum VstEffectOpcodes
{
    effOpen = 0,
    effClose = 1,
    effSetProgram = 2,
    effGetProgram = 3,
    effSetProgramName = 4,
    effGetProgramName = 5,
    effGetParamLabel = 6,
    effGetParamDisplay = 7,
    effGetParamName = 8,
    effSetSampleRate = 10,
    effSetBlockSize = 11,
    effMainsChanged = 12,
    effEditGetRect = 13,
    effEditOpen = 14,
    effEditClose = 15,
    effEditIdle = 19,
    effEditTop = 20,
    effEditSleep = 21,
    effIdentify = 22,
    effGetChunk = 23,
    effSetChunk = 24,
    effProcessEvents = 25,
    effCanBeAutomated = 26,
    effGetEffectName = 39,
    effGetVendorString = 41,
    effGetProductString = 42,
    effGetVendorVersion = 43,
    effCanDo = 45,
    effIdle = 47,
    effSetViewPosition = 49,
    effGetVstVersion = 52,
    effEditKeyDown = 53,
    effEditKeyUp = 54,
    effStartProcess = 65,
    effStopProcess = 66,
    effSetProcessPrecision = 71
};

enum VstPluginCanDo
{
    canDoSendVstEvents = 0,
    canDoSendVstMidiEvent = 1,
    canDoReceiveVstEvents = 2,
    canDoReceiveVstMidiEvent = 3
};

//------------------------------------------------------------------------
// AudioMasterCallback opcodes (plugin -> host)
enum VstAudioMasterOpcodes
{
    audioMasterAutomate = 0,
    audioMasterVersion = 1,
    audioMasterCurrentId = 2,
    audioMasterIdle = 3,
    audioMasterWantMidi = 6,
    audioMasterGetTime = 7,
    audioMasterProcessEvents = 8,
    audioMasterGetVendorString = 14,
    audioMasterGetProductString = 15,
    audioMasterGetVendorVersion = 16,
    audioMasterCanDo = 19,
    audioMasterGetLanguage = 20,
    audioMasterGetDirectory = 21,
    audioMasterUpdateDisplay = 22,
    audioMasterGetSampleRate = 35,
    audioMasterGetBlockSize = 36,
    audioMasterGetInputLatency = 29,
    audioMasterGetOutputLatency = 30
};

//------------------------------------------------------------------------
// MIDI events qua effProcessEvents (không dùng giao diện MIDI cũ của AEffect)
struct VstEvent
{
    int32 type;
    int32 byteSize;
    int32 flags;
    intptr_t* data; // 4 bytes padding trên Win64 giữ layout
};

struct VstMidiEvent
{
    int32 type;        // kVstMidiType
    int32 byteSize;    // sizeof(VstMidiEvent)
    int32 deltaFrames;
    int32 flags;       // kVstMidiEventIsRealtime
    int32 noteLength;  // 0
    int32 noteOffset;  // 0
    char midiData[4];  // status, data1, data2, pad
    char detune;
    char noteOffVelocity;
    char reserved1;
    char reserved2;
};

struct VstEvents
{
    int32 numEvents;
    intptr_t reserved;
    VstEvent* events[1];
};

enum VstEventTypes
{
    kVstMidiType = 1
};

enum VstMidiEventFlags
{
    kVstMidiEventIsRealtime = 1 << 0
};

//------------------------------------------------------------------------
// Editor rect (effEditGetRect)
struct ERect
{
    short top;
    short left;
    short bottom;
    short right;
};

//------------------------------------------------------------------------
// VST2 entry points (typedef names khác tên export để tránh redefinition)
typedef AEffect* (VSTCALLBACK* VSTPluginMainFn)(void* audioMasterCallback);
typedef AEffect* (VSTCALLBACK* VSTPluginMainOldFn)(void* audioMasterCallback, void* reserved);
typedef VstIntPtr (VSTCALLBACK* audioMasterCallbackFunc)(AEffect* effect, int32 opcode, int32 index, VstIntPtr value, void* ptr, float opt);