#pragma once

#include <stdint.h>

// This file contains the structures specifying how we store converted metadata.
// These structures have 3 constraints:
// 1. These structures will be stored in an external file, and as such must not contain any pointers.
//    All references to other metadata should occur via an index into a corresponding table.
// 2. These structures are assumed to be const. Either const structures in the binary or mapped as
//    readonly memory from an external file. Do not add any 'calculated' fields which will be written to at runtime.
// 3. These structures should be optimized for size. Other structures are used at runtime which can
//    be larger to store cached information

typedef int32_t TypeIndex;
typedef int32_t TypeDefinitionIndex;
typedef int32_t FieldIndex;
typedef int32_t DefaultValueIndex;
typedef int32_t DefaultValueDataIndex;
typedef int32_t CustomAttributeIndex;
typedef int32_t ParameterIndex;
typedef int32_t MethodIndex;
typedef int32_t GenericMethodIndex;
typedef int32_t PropertyIndex;
typedef int32_t EventIndex;
typedef int32_t GenericContainerIndex;
typedef int32_t GenericParameterIndex;
typedef int16_t GenericParameterConstraintIndex;
typedef int32_t NestedTypeIndex;
typedef int32_t InterfacesIndex;
typedef int32_t VTableIndex;
typedef int32_t InterfaceOffsetIndex;
typedef int32_t RGCTXIndex;
typedef int32_t StringIndex;
typedef int32_t StringLiteralIndex;
typedef int32_t GenericInstIndex;
typedef int32_t ImageIndex;
typedef int32_t AssemblyIndex;
typedef int32_t InteropDataIndex;

const TypeIndex kTypeIndexInvalid = -1;
const TypeDefinitionIndex kTypeDefinitionIndexInvalid = -1;
const DefaultValueDataIndex kDefaultValueIndexNull = -1;
const CustomAttributeIndex kCustomAttributeIndexInvalid = -1;
const EventIndex kEventIndexInvalid = -1;
const FieldIndex kFieldIndexInvalid = -1;
const MethodIndex kMethodIndexInvalid = -1;
const PropertyIndex kPropertyIndexInvalid = -1;
const GenericContainerIndex kGenericContainerIndexInvalid = -1;
const GenericParameterIndex kGenericParameterIndexInvalid = -1;
const RGCTXIndex kRGCTXIndexInvalid = -1;
const StringLiteralIndex kStringLiteralIndexInvalid = -1;
const InteropDataIndex kInteropDataIndexInvalid = -1;

// Encoded index (1 bit)
// MethodDef - 0
// MethodSpec - 1
// We use the top 3 bits to indicate what table to index into
// Type              Binary            Hex
// Il2CppClass          001               0x20000000
// Il2CppType        010               0x40000000
// MethodInfo        011               0x60000000
// FieldInfo         100               0x80000000
// StringLiteral     101               0xA0000000
// MethodRef         110               0xC0000000

typedef uint32_t EncodedMethodIndex;

enum Il2CppMetadataUsage
{
    kIl2CppMetadataUsageInvalid,
    kIl2CppMetadataUsageTypeInfo,
    kIl2CppMetadataUsageIl2CppType,
    kIl2CppMetadataUsageMethodDef,
    kIl2CppMetadataUsageFieldInfo,
    kIl2CppMetadataUsageStringLiteral,
    kIl2CppMetadataUsageMethodRef,
};

#ifdef __cplusplus
static inline Il2CppMetadataUsage GetEncodedIndexType(EncodedMethodIndex index)
{
    return (Il2CppMetadataUsage)((index & 0xE0000000) >> 29);
}

static inline uint32_t GetDecodedMethodIndex(EncodedMethodIndex index)
{
    return index & 0x1FFFFFFFU;
}

#endif

struct Il2CppImage;
struct Il2CppType;
struct Il2CppTypeDefinitionMetadata;

typedef union Il2CppRGCTXDefinitionData
{
    int32_t rgctxDataDummy;
    MethodIndex methodIndex;
    TypeIndex typeIndex;
} Il2CppRGCTXDefinitionData;

typedef enum Il2CppRGCTXDataType
{
    IL2CPP_RGCTX_DATA_INVALID,
    IL2CPP_RGCTX_DATA_TYPE,
    IL2CPP_RGCTX_DATA_CLASS,
    IL2CPP_RGCTX_DATA_METHOD,
    IL2CPP_RGCTX_DATA_ARRAY,
} Il2CppRGCTXDataType;

typedef struct Il2CppRGCTXDefinition
{
    Il2CppRGCTXDataType type;
    Il2CppRGCTXDefinitionData data;
} Il2CppRGCTXDefinition;

typedef struct Il2CppInterfaceOffsetPair
{
    TypeIndex interfaceTypeIndex;
    int32_t offset;
} Il2CppInterfaceOffsetPair;

typedef struct Il2CppTypeDefinition
{
    StringIndex nameIndex;
    StringIndex namespaceIndex;
    TypeIndex byvalTypeIndex;
    TypeIndex byrefTypeIndex;

    TypeIndex declaringTypeIndex;
    TypeIndex parentIndex;
    TypeIndex elementTypeIndex; // we can probably remove this one. Only used for enums

    RGCTXIndex rgctxStartIndex;
    int32_t rgctxCount;

    GenericContainerIndex genericContainerIndex;

    uint32_t flags;

    FieldIndex fieldStart;
    MethodIndex methodStart;
    EventIndex eventStart;
    PropertyIndex propertyStart;
    NestedTypeIndex nestedTypesStart;
    InterfacesIndex interfacesStart;
    VTableIndex vtableStart;
    InterfacesIndex interfaceOffsetsStart;

    uint16_t method_count;
    uint16_t property_count;
    uint16_t field_count;
    uint16_t event_count;
    uint16_t nested_type_count;
    uint16_t vtable_count;
    uint16_t interfaces_count;
    uint16_t interface_offsets_count;

    // bitfield to portably encode boolean values as single bits
    // 01 - valuetype;
    // 02 - enumtype;
    // 03 - has_finalize;
    // 04 - has_cctor;
    // 05 - is_blittable;
    // 06 - is_import_or_windows_runtime;
    // 07-10 - One of nine possible PackingSize values (0, 1, 2, 4, 8, 16, 32, 64, or 128)
    uint32_t bitfield;
    uint32_t token;
} Il2CppTypeDefinition;

typedef struct Il2CppFieldDefinition
{
    StringIndex nameIndex;
    TypeIndex typeIndex;
    uint32_t token;
} Il2CppFieldDefinition;

typedef struct Il2CppFieldDefaultValue
{
    FieldIndex fieldIndex;
    TypeIndex typeIndex;
    DefaultValueDataIndex dataIndex;
} Il2CppFieldDefaultValue;

typedef struct Il2CppFieldMarshaledSize
{
    FieldIndex fieldIndex;
    TypeIndex typeIndex;
    int32_t size;
} Il2CppFieldMarshaledSize;

typedef struct Il2CppFieldRef
{
    TypeIndex typeIndex;
    FieldIndex fieldIndex; // local offset into type fields
} Il2CppFieldRef;

typedef struct Il2CppParameterDefinition
{
    StringIndex nameIndex;
    uint32_t token;
    TypeIndex typeIndex;
} Il2CppParameterDefinition;

typedef struct Il2CppParameterDefaultValue
{
    ParameterIndex parameterIndex;
    TypeIndex typeIndex;
    DefaultValueDataIndex dataIndex;
} Il2CppParameterDefaultValue;

typedef struct Il2CppMethodDefinition
{
    StringIndex nameIndex;
    TypeDefinitionIndex declaringType;
    TypeIndex returnType;
    ParameterIndex parameterStart;
    GenericContainerIndex genericContainerIndex;
    MethodIndex methodIndex;
    MethodIndex invokerIndex;
    MethodIndex reversePInvokeWrapperIndex;
    RGCTXIndex rgctxStartIndex;
    int32_t rgctxCount;
    uint32_t token;
    uint16_t flags;
    uint16_t iflags;
    uint16_t slot;
    uint16_t parameterCount;
} Il2CppMethodDefinition;

typedef struct Il2CppEventDefinition
{
    StringIndex nameIndex;
    TypeIndex typeIndex;
    MethodIndex add;
    MethodIndex remove;
    MethodIndex raise;
    uint32_t token;
} Il2CppEventDefinition;

typedef struct Il2CppPropertyDefinition
{
    StringIndex nameIndex;
    MethodIndex get;
    MethodIndex set;
    uint32_t attrs;
    uint32_t token;
} Il2CppPropertyDefinition;

typedef struct Il2CppMethodSpec
{
    MethodIndex methodDefinitionIndex;
    GenericInstIndex classIndexIndex;
    GenericInstIndex methodIndexIndex;
} Il2CppMethodSpec;

typedef struct Il2CppStringLiteral
{
    uint32_t length;
    StringLiteralIndex dataIndex;
} Il2CppStringLiteral;

typedef struct
{
    MethodIndex methodIndex;
    MethodIndex invokerIndex;
} Il2CppGenericMethodIndices;

typedef struct Il2CppGenericMethodFunctionsDefinitions
{
    GenericMethodIndex genericMethodIndex;
    Il2CppGenericMethodIndices indices;
} Il2CppGenericMethodFunctionsDefinitions;

#define PUBLIC_KEY_BYTE_LENGTH 8
const int kPublicKeyByteLength = PUBLIC_KEY_BYTE_LENGTH;

typedef struct Il2CppAssemblyNameDefinition
{
    StringIndex nameIndex;
    StringIndex cultureIndex;
    StringIndex hashValueIndex;
    StringIndex publicKeyIndex;
    uint32_t hash_alg;
    int32_t hash_len;
    uint32_t flags;
    int32_t major;
    int32_t minor;
    int32_t build;
    int32_t revision;
    uint8_t public_key_token[PUBLIC_KEY_BYTE_LENGTH];
} Il2CppAssemblyNameDefinition;

typedef struct Il2CppImageDefinition
{
    StringIndex nameIndex;
    AssemblyIndex assemblyIndex;

    TypeDefinitionIndex typeStart;
    uint32_t typeCount;

    TypeDefinitionIndex exportedTypeStart;
    uint32_t exportedTypeCount;

    MethodIndex entryPointIndex;
    uint32_t token;

    CustomAttributeIndex customAttributeStart;
    uint32_t customAttributeCount;
} Il2CppImageDefinition;

typedef struct Il2CppAssemblyDefinition
{
    ImageIndex imageIndex;
    uint32_t token;
    int32_t referencedAssemblyStart;
    int32_t referencedAssemblyCount;
    Il2CppAssemblyNameDefinition aname;
} Il2CppAssemblyDefinition;

typedef struct Il2CppMetadataUsageList
{
    uint32_t start;
    uint32_t count;
} Il2CppMetadataUsageList;

typedef struct Il2CppMetadataUsagePair
{
    uint32_t destinationIndex;
    uint32_t encodedSourceIndex;
} Il2CppMetadataUsagePair;

typedef struct Il2CppCustomAttributeTypeRange
{
    uint32_t token;
    int32_t start;
    int32_t count;
} Il2CppCustomAttributeTypeRange;

typedef struct Il2CppRange
{
    int32_t start;
    int32_t length;
} Il2CppRange;

typedef struct Il2CppWindowsRuntimeTypeNamePair
{
    StringIndex nameIndex;
    TypeIndex typeIndex;
} Il2CppWindowsRuntimeTypeNamePair;

#pragma pack(push, p1,4)
typedef struct Il2CppGlobalMetadataHeader
{
    int32_t sanity;
    int32_t version;
    int32_t stringLiteralOffset; // string data for managed code
    int32_t stringLiteralCount;
    int32_t stringLiteralDataOffset;
    int32_t stringLiteralDataCount;
    int32_t stringOffset; // string data for metadata
    int32_t stringCount;
    int32_t eventsOffset; // Il2CppEventDefinition
    int32_t eventsCount;
    int32_t propertiesOffset; // Il2CppPropertyDefinition
    int32_t propertiesCount;
    int32_t methodsOffset; // Il2CppMethodDefinition
    int32_t methodsCount;
    int32_t parameterDefaultValuesOffset; // Il2CppParameterDefaultValue
    int32_t parameterDefaultValuesCount;
    int32_t fieldDefaultValuesOffset; // Il2CppFieldDefaultValue
    int32_t fieldDefaultValuesCount;
    int32_t fieldAndParameterDefaultValueDataOffset; // uint8_t
    int32_t fieldAndParameterDefaultValueDataCount;
    int32_t fieldMarshaledSizesOffset; // Il2CppFieldMarshaledSize
    int32_t fieldMarshaledSizesCount;
    int32_t parametersOffset; // Il2CppParameterDefinition
    int32_t parametersCount;
    int32_t fieldsOffset; // Il2CppFieldDefinition
    int32_t fieldsCount;
    int32_t genericParametersOffset; // Il2CppGenericParameter
    int32_t genericParametersCount;
    int32_t genericParameterConstraintsOffset; // TypeIndex
    int32_t genericParameterConstraintsCount;
    int32_t genericContainersOffset; // Il2CppGenericContainer
    int32_t genericContainersCount;
    int32_t nestedTypesOffset; // TypeDefinitionIndex
    int32_t nestedTypesCount;
    int32_t interfacesOffset; // TypeIndex
    int32_t interfacesCount;
    int32_t vtableMethodsOffset; // EncodedMethodIndex
    int32_t vtableMethodsCount;
    int32_t interfaceOffsetsOffset; // Il2CppInterfaceOffsetPair
    int32_t interfaceOffsetsCount;
    int32_t typeDefinitionsOffset; // Il2CppTypeDefinition
    int32_t typeDefinitionsCount;
    int32_t rgctxEntriesOffset; // Il2CppRGCTXDefinition
    int32_t rgctxEntriesCount;
    int32_t imagesOffset; // Il2CppImageDefinition
    int32_t imagesCount;
    int32_t assembliesOffset; // Il2CppAssemblyDefinition
    int32_t assembliesCount;
    int32_t metadataUsageListsOffset; // Il2CppMetadataUsageList
    int32_t metadataUsageListsCount;
    int32_t metadataUsagePairsOffset; // Il2CppMetadataUsagePair
    int32_t metadataUsagePairsCount;
    int32_t fieldRefsOffset; // Il2CppFieldRef
    int32_t fieldRefsCount;
    int32_t referencedAssembliesOffset; // int32_t
    int32_t referencedAssembliesCount;
    int32_t attributesInfoOffset; // Il2CppCustomAttributeTypeRange
    int32_t attributesInfoCount;
    int32_t attributeTypesOffset; // TypeIndex
    int32_t attributeTypesCount;
    int32_t unresolvedVirtualCallParameterTypesOffset; // TypeIndex
    int32_t unresolvedVirtualCallParameterTypesCount;
    int32_t unresolvedVirtualCallParameterRangesOffset; // Il2CppRange
    int32_t unresolvedVirtualCallParameterRangesCount;
    int32_t windowsRuntimeTypeNamesOffset; // Il2CppWindowsRuntimeTypeNamePair
    int32_t windowsRuntimeTypeNamesSize;
    int32_t exportedTypeDefinitionsOffset; // TypeDefinitionIndex
    int32_t exportedTypeDefinitionsCount;
} Il2CppGlobalMetadataHeader;
#pragma pack(pop, p1)

#if RUNTIME_MONO

#pragma pack(push, p1,4)
typedef struct Il2CppGlobalMonoMetadataHeader
{
    int32_t sanity;
    int32_t version;
    int32_t stringOffset; // string data for metadata
    int32_t stringCount;
    int32_t methodInfoMappingOffset; // hash -> MonoMethodInfo mapping
    int32_t methodInfoMappingCount;
    int32_t genericMethodInfoMappingOffset; // hash -> generic MonoMethodInfo mapping
    int32_t genericMethodInfoMappingCount;
    int32_t rgctxIndicesOffset; // runtime generic context indices
    int32_t rgctxIndicesCount;
    int32_t rgctxInfoOffset; // runtime generic context info
    int32_t rgctxInfoCount;
    int32_t monoStringOffset; // mono strings
    int32_t monoStringCount;
    int32_t methodMetadataOffset; // method metadata
    int32_t methodMetadataCount;
    int32_t genericArgumentIndicesOffset; // generic argument indices
    int32_t genericArgumentIndicesCount;
    int32_t typeTableOffset; // type table
    int32_t typeTableCount;
    int32_t fieldTableOffset; // field table
    int32_t fieldTableCount;
    int32_t methodIndexTableOffset; // method index table
    int32_t methodIndexTableCount;
    int32_t genericMethodIndexTableOffset; // generic method index table
    int32_t genericMethodIndexTableCount;
    int32_t metaDataUsageListsTableOffset; // meta data usage lists table
    int32_t metaDataUsageListsTableCount;
    int32_t metaDataUsagePairsTableOffset; // meta data usage pairs table
    int32_t metaDataUsagePairsTableCount;
    int32_t assemblyNameTableOffset; // assembly names
    int32_t assemblyNameTableCount;
} Il2CppGlobalMonoMetadataHeader;
#pragma pack(pop, p1)
#endif
