/*
 * Copyright (C) 2014 the contributors as stated in the AUTHORS file
 *
 * This file is part of open62541. open62541 is free software: you can
 * redistribute it and/or modify it under the terms of the GNU Lesser General
 * Public License, version 3 (as published by the Free Software Foundation) with
 * a static linking exception as stated in the LICENSE file provided with
 * open62541.
 *
 * open62541 is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
 * A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
 * details.
 */

#ifndef UA_TYPES_H_
#define UA_TYPES_H_

#ifdef __cplusplus
extern "C" {
#endif

#include "ua_config.h"

#include <stdint.h>
#include <stdbool.h>
#ifdef UA_DEBUG
#include <stdio.h>
#endif

/**
 * @defgroup types Datatypes
 *
 * @brief The built-in datatypes. The remaining datatypes are autogenerated from
 * XML descriptions as they are all enums or structures made up of the built-in
 * datatypes.
 *
 * All datatypes have similar functions with a common postfix. DO NOT CALL THESE
 * FUNCTIONS WITH NULL-POINTERS IF IT IS NOT EXPLICITLY PERMITTED.
 *
 * - _new: Allocates the memory for the type and runs _init on the returned
 *   variable. Returns null if no memory could be allocated.
 *
 * - _init: Sets all members to a "safe" standard, usually zero. Arrays (e.g.
 *   for strings) are set to a length of -1.
 *
 * - _copy: Copies a datatype. This performs a deep copy that iterates over the
 *    members. Copying into variants with an external data source is not
 *    permitted. If copying fails, a deleteMembers is performed and an error
 *    code returned.
 *
 * - _delete: Frees the memory where the datatype was stored. This performs an
 *   _deleteMembers internally if required.
 *
 * - _deleteMembers: Frees the memory of dynamically sized members (e.g. a
 *   string) of a datatype. This is useful when the datatype was allocated on
 *   the stack, whereas the dynamically sized members is heap-allocated. To
 *   reuse the variable, the remaining members (not dynamically allocated) need
 *   to be cleaned up with an _init.
 *
 * @{
 */

/** @brief A two-state logical value (true or false). */
typedef bool UA_Boolean;
#define UA_TRUE true
#define UA_FALSE false

/** @brief An integer value between -129 and 127. */
typedef int8_t UA_SByte;
#define UA_SBYTE_MAX 127
#define UA_SBYTE_MIN -128

/** @brief An integer value between 0 and 256. */
typedef uint8_t UA_Byte;
#define UA_BYTE_MAX 256
#define UA_BYTE_MIN 0

/** @brief An integer value between -32 768 and 32 767. */
typedef int16_t UA_Int16;
#define UA_INT16_MAX 32767
#define UA_INT16_MIN -32768

/** @brief An integer value between 0 and 65 535. */
typedef uint16_t UA_UInt16;
#define UA_UINT16_MAX 65535
#define UA_UINT16_MIN 0

/** @brief An integer value between -2 147 483 648 and 2 147 483 647. */
typedef int32_t UA_Int32;
#define UA_INT32_MAX 2147483647
#define UA_INT32_MIN −2147483648

/** @brief An integer value between 0 and 429 4967 295. */
typedef uint32_t UA_UInt32;
#define UA_UINT32_MAX 4294967295
#define UA_UINT32_MIN 0

/** @brief An integer value between -10 223 372 036 854 775 808 and 9 223 372 036 854 775 807 */
typedef int64_t UA_Int64;
#define UA_INT64_MAX 9223372036854775807
#define UA_INT64_MIN −9223372036854775808

/** @brief An integer value between 0 and 18 446 744 073 709 551 615. */
typedef uint64_t UA_UInt64;
#define UA_UINT64_MAX = 18446744073709551615
#define UA_UINT64_MIN = 0

/** @brief An IEEE single precision (32 bit) floating point value. */
typedef float UA_Float;

/** @brief An IEEE double precision (64 bit) floating point value. */
typedef double UA_Double;

/** @brief A sequence of Unicode characters. */
typedef struct {
    UA_Int32 length;
    UA_Byte *data;
} UA_String;

/** @brief An instance in time.
 *
 * A DateTime value is encoded as a 64-bit signed integer which represents the
 * number of 100 nanosecond intervals since January 1, 1601 (UTC).
 */
typedef UA_Int64 UA_DateTime; // 100 nanosecond resolution

/** @brief A 16 byte value that can be used as a globally unique identifier. */
typedef struct {
    UA_UInt32 data1;
    UA_UInt16 data2;
    UA_UInt16 data3;
    UA_Byte   data4[8];
} UA_Guid;

/** @brief A sequence of octets. */
typedef UA_String UA_ByteString;

/** @brief An XML element. */
typedef UA_String UA_XmlElement;

/** @brief An identifier for a node in the address space of an OPC UA Server. */
/* The shortened numeric types are introduced during encoding. */
typedef struct {
    UA_UInt16 namespaceIndex;
    enum {
        UA_NODEIDTYPE_NUMERIC    = 2,
        UA_NODEIDTYPE_STRING     = 3,
        UA_NODEIDTYPE_GUID       = 4,
        UA_NODEIDTYPE_BYTESTRING = 5
    } identifierType;
    union {
        UA_UInt32     numeric;
        UA_String     string;
        UA_Guid       guid;
        UA_ByteString byteString;
    } identifier;
} UA_NodeId;

/** @brief A NodeId that allows the namespace URI to be specified instead of an index. */
typedef struct {
    UA_NodeId nodeId;
    UA_String namespaceUri; // not encoded if length=-1
    UA_UInt32 serverIndex;  // not encoded if 0
} UA_ExpandedNodeId;

#include "ua_statuscodes.h"
/** @brief A numeric identifier for a error or condition that is associated with a value or an operation. */
typedef enum UA_StatusCode UA_StatusCode; // StatusCodes aren't an enum(=int) since 32 unsigned bits are needed. See also ua_statuscodes.h */

/** @brief A name qualified by a namespace. */
typedef struct {
    UA_UInt16 namespaceIndex;
    UA_String name;
} UA_QualifiedName;

/** @brief Human readable text with an optional locale identifier. */
typedef struct {
    UA_String locale;
    UA_String text;
} UA_LocalizedText;

/** @brief A structure that contains an application specific data type that may
    not be recognized by the receiver. */
typedef struct {
    UA_NodeId typeId;
    enum {
        UA_EXTENSIONOBJECT_ENCODINGMASK_NOBODYISENCODED  = 0,
        UA_EXTENSIONOBJECT_ENCODINGMASK_BODYISBYTESTRING = 1,
        UA_EXTENSIONOBJECT_ENCODINGMASK_BODYISXML        = 2
    } encoding;
    UA_ByteString body; // contains either the bytestring or a pointer to the memory-object
} UA_ExtensionObject;

struct UA_TypeVTable; // forward declaration
typedef struct UA_TypeVTable UA_TypeVTable;

/** @brief Pointers to data that is stored in memory. The "type" of the data is
    stored in the variant itself. */
typedef struct {
    UA_Int32  arrayLength;        // total number of elements in the data-pointer
    void     *dataPtr;
    UA_Int32  arrayDimensionsLength;
    UA_Int32 *arrayDimensions;
} UA_VariantData;

/** @brief A datasource is the interface to interact with a local data provider.
 *
 *  Implementors of datasources need to provide functions for the callbacks in
 *  this structure. As a rule, datasources are never copied, but only their
 *  content. The only way to write into a datasource is via the write-service. */
typedef struct {
    const void *identifier; /**< whatever id the datasource uses internally. Can be ignored if the datasource functions do not use it. */
    UA_Int32 (*read)(const void *identifier, const UA_VariantData **); /**< Get the current data from the datasource. When it is no longer used, the data has to be relased. */
    void (*release)(const void *identifier, const UA_VariantData *); /**< For concurrent access, the datasource needs to know when the last reader releases replaced/deleted data. Release decreases the reference count. */
    UA_Int32 (*write)(const void **identifier, const UA_VariantData *); /**< Replace the data in the datasource. Also used to replace the identifier pointer for lookups. Do not free the variantdata afterwards! */
    void (*delete)(const void *identifier); /**< Indicates that the node with the datasource was removed from the namespace. */
} UA_VariantDataSource;

/** @brief Variants store (arrays of) any data type. Either they provide a
    pointer to the data in memory, or functions from which the data can be
    accessed. */
typedef struct {
    const UA_TypeVTable *vt; /// The VTable of the datatype in question
    enum {
        UA_VARIANT_DATA, ///< The data is stored in memory and "owned" by this variant
        UA_VARIANT_DATA_NODELETE, ///< The data is stored in memory, but only "borrowed" and shall not be deleted at the end of this variant's lifecycle
        UA_VARIANT_DATASOURCE ///< The data is provided externally. Call the functions in the datasource to get a current version
    } storageType;
    union {
        UA_VariantData       data;
        UA_VariantDataSource datasource;
    } storage;
} UA_Variant;

/** @brief A data value with an associated status code and timestamps. */
typedef struct {
    UA_Byte       encodingMask;
    UA_Variant    value;
    UA_StatusCode status;
    UA_DateTime   sourceTimestamp;
    UA_Int16      sourcePicoseconds;
    UA_DateTime   serverTimestamp;
    UA_Int16      serverPicoseconds;
} UA_DataValue;

enum UA_DATAVALUE_ENCODINGMASKTYPE_enum {
    UA_DATAVALUE_ENCODINGMASK_VARIANT           = 0x01,
    UA_DATAVALUE_ENCODINGMASK_STATUSCODE        = 0x02,
    UA_DATAVALUE_ENCODINGMASK_SOURCETIMESTAMP   = 0x04,
    UA_DATAVALUE_ENCODINGMASK_SERVERTIMESTAMP   = 0x08,
    UA_DATAVALUE_ENCODINGMASK_SOURCEPICOSECONDS = 0x10,
    UA_DATAVALUE_ENCODINGMASK_SERVERPICOSECONDS = 0x20
};

/** @brief A structure that contains detailed error and diagnostic information associated with a StatusCode. */
typedef struct UA_DiagnosticInfo {
    UA_Byte       encodingMask;     // Type of the Enum UA_DIAGNOSTICINFO_ENCODINGMASKTYPE
    UA_Int32      symbolicId;
    UA_Int32      namespaceUri;
    UA_Int32      localizedText;
    UA_Int32      locale;
    UA_String     additionalInfo;
    UA_StatusCode innerStatusCode;
    struct UA_DiagnosticInfo *innerDiagnosticInfo;
} UA_DiagnosticInfo;

enum UA_DIAGNOSTICINFO_ENCODINGMASKTYPE_enum {
    UA_DIAGNOSTICINFO_ENCODINGMASK_SYMBOLICID          = 0x01,
    UA_DIAGNOSTICINFO_ENCODINGMASK_NAMESPACE           = 0x02,
    UA_DIAGNOSTICINFO_ENCODINGMASK_LOCALIZEDTEXT       = 0x04,
    UA_DIAGNOSTICINFO_ENCODINGMASK_LOCALE              = 0x08,
    UA_DIAGNOSTICINFO_ENCODINGMASK_ADDITIONALINFO      = 0x10,
    UA_DIAGNOSTICINFO_ENCODINGMASK_INNERSTATUSCODE     = 0x20,
    UA_DIAGNOSTICINFO_ENCODINGMASK_INNERDIAGNOSTICINFO = 0x40
};

/** @brief Type use internally to denote an invalid datatype. */
typedef void UA_InvalidType;

/*************/
/* Functions */
/*************/

#ifdef UA_DEBUG
#define PRINTTYPE(TYPE) void UA_EXPORT TYPE##_print(const TYPE *p, FILE *stream);
#define PRINTTYPE_NOEXPORT(TYPE) void TYPE##_print(const TYPE *p, FILE *stream);
#else
#define PRINTTYPE(TYPE)
#define PRINTTYPE_NOEXPORT(TYPE)
#endif

#define UA_TYPE_PROTOTYPES(TYPE)                                     \
    TYPE UA_EXPORT * TYPE##_new(void);                               \
    void UA_EXPORT TYPE##_init(TYPE * p);                            \
    void UA_EXPORT TYPE##_delete(TYPE * p);                          \
    void UA_EXPORT TYPE##_deleteMembers(TYPE * p);                   \
    UA_StatusCode UA_EXPORT TYPE##_copy(const TYPE *src, TYPE *dst); \
    PRINTTYPE(TYPE)

#define UA_TYPE_PROTOTYPES_NOEXPORT(TYPE)                            \
    TYPE * TYPE##_new(void);                                         \
    void TYPE##_init(TYPE * p);                                      \
    void TYPE##_delete(TYPE * p);                                    \
    void TYPE##_deleteMembers(TYPE * p);                             \
    UA_StatusCode TYPE##_copy(const TYPE *src, TYPE *dst);           \
    PRINTTYPE_NOEXPORT(TYPE)

/* Functions for all types */
UA_TYPE_PROTOTYPES(UA_Boolean)
UA_TYPE_PROTOTYPES(UA_SByte)
UA_TYPE_PROTOTYPES(UA_Byte)
UA_TYPE_PROTOTYPES(UA_Int16)
UA_TYPE_PROTOTYPES(UA_UInt16)
UA_TYPE_PROTOTYPES(UA_Int32)
UA_TYPE_PROTOTYPES(UA_UInt32)
UA_TYPE_PROTOTYPES(UA_Int64)
UA_TYPE_PROTOTYPES(UA_UInt64)
UA_TYPE_PROTOTYPES(UA_Float)
UA_TYPE_PROTOTYPES(UA_Double)
UA_TYPE_PROTOTYPES(UA_String)
UA_TYPE_PROTOTYPES(UA_DateTime)
UA_TYPE_PROTOTYPES(UA_Guid)
UA_TYPE_PROTOTYPES(UA_ByteString)
UA_TYPE_PROTOTYPES(UA_XmlElement)
UA_TYPE_PROTOTYPES(UA_NodeId)
UA_TYPE_PROTOTYPES(UA_ExpandedNodeId)
UA_TYPE_PROTOTYPES(UA_StatusCode)
UA_TYPE_PROTOTYPES(UA_QualifiedName)
UA_TYPE_PROTOTYPES(UA_LocalizedText)
UA_TYPE_PROTOTYPES(UA_ExtensionObject)
UA_TYPE_PROTOTYPES(UA_DataValue)
UA_TYPE_PROTOTYPES(UA_Variant)
UA_TYPE_PROTOTYPES(UA_DiagnosticInfo)
UA_TYPE_PROTOTYPES(UA_InvalidType)

/**********************************************/
/* Custom functions for the builtin datatypes */
/**********************************************/

/* String */
#define UA_STRING_NULL (UA_String) {-1, (UA_Byte*)0 }
#define UA_STRING_STATIC(VARIABLE, STRING) do { \
        VARIABLE.length = sizeof(STRING)-1;     \
        VARIABLE.data   = (UA_Byte *)STRING; } while(0)

UA_StatusCode UA_EXPORT UA_String_copycstring(char const *src, UA_String *dst);
UA_StatusCode UA_EXPORT UA_String_copyprintf(char const *fmt, UA_String *dst, ...);
UA_Boolean UA_EXPORT UA_String_equal(const UA_String *string1, const UA_String *string2);
#ifdef UA_DEBUG
void UA_EXPORT UA_String_printf(char const *label, const UA_String *string);
void UA_EXPORT UA_String_printx(char const *label, const UA_String *string);
void UA_EXPORT UA_String_printx_hex(char const *label, const UA_String *string);
#endif

/* DateTime */
UA_DateTime UA_EXPORT UA_DateTime_now(void);
typedef struct UA_DateTimeStruct {
    UA_Int16 nanoSec;
    UA_Int16 microSec;
    UA_Int16 milliSec;
    UA_Int16 sec;
    UA_Int16 min;
    UA_Int16 hour;
    UA_Int16 day;
    UA_Int16 month;
    UA_Int16 year;
} UA_DateTimeStruct;
UA_DateTimeStruct UA_EXPORT UA_DateTime_toStruct(UA_DateTime time);
UA_StatusCode UA_EXPORT UA_DateTime_toString(UA_DateTime time, UA_String *timeString);

/* Guid */
UA_Boolean UA_EXPORT UA_Guid_equal(const UA_Guid *g1, const UA_Guid *g2);
/** Do not use for security-critical entropy! */
UA_Guid UA_EXPORT UA_Guid_random(UA_UInt32 *seed);

/* ByteString */
UA_Boolean UA_EXPORT UA_ByteString_equal(const UA_ByteString *string1, const UA_ByteString *string2);
UA_StatusCode UA_EXPORT UA_ByteString_newMembers(UA_ByteString *p, UA_Int32 length);
#ifdef UA_DEBUG
void UA_EXPORT UA_ByteString_printf(char *label, const UA_ByteString *string);
void UA_EXPORT UA_ByteString_printx(char *label, const UA_ByteString *string);
void UA_EXPORT UA_ByteString_printx_hex(char *label, const UA_ByteString *string);
#endif

/* NodeId */
UA_Boolean UA_EXPORT UA_NodeId_equal(const UA_NodeId *n1, const UA_NodeId *n2);
UA_Boolean UA_EXPORT UA_NodeId_isNull(const UA_NodeId *p);

/* ExpandedNodeId */
UA_Boolean UA_EXPORT UA_ExpandedNodeId_isNull(const UA_ExpandedNodeId *p);

/* QualifiedName */
#define UA_QUALIFIEDNAME_STATIC(VARIABLE, STRING) do { \
        VARIABLE.namespaceIndex = 0;                   \
        UA_STRING_STATIC(VARIABLE.name, STRING); } while(0)
UA_StatusCode UA_EXPORT UA_QualifiedName_copycstring(char const *src, UA_QualifiedName *dst);
#ifdef UA_DEBUG
void UA_EXPORT UA_QualifiedName_printf(char const *label, const UA_QualifiedName *qn);
#endif

/* LocalizedText */
#define UA_LOCALIZEDTEXT_STATIC(VARIABLE, STRING) do { \
        UA_STRING_STATIC(VARIABLE.locale, "en");       \
        UA_STRING_STATIC(VARIABLE.text, STRING); } while(0)

UA_StatusCode UA_EXPORT UA_LocalizedText_copycstring(char const *src, UA_LocalizedText *dst);

/* Variant */
UA_StatusCode UA_EXPORT UA_Variant_copySetValue(UA_Variant *v, const UA_TypeVTable *vt, const void *value);
UA_StatusCode UA_EXPORT UA_Variant_copySetArray(UA_Variant *v, const UA_TypeVTable *vt, UA_Int32 arrayLength, const void *array);

/* Array operations */
UA_StatusCode UA_EXPORT UA_Array_new(void **p, UA_Int32 noElements, const UA_TypeVTable *vt);
void UA_EXPORT UA_Array_init(void *p, UA_Int32 noElements, const UA_TypeVTable *vt);
void UA_EXPORT UA_Array_delete(void *p, UA_Int32 noElements, const UA_TypeVTable *vt);

/* @brief The destination array is allocated with size noElements. */
UA_StatusCode UA_EXPORT UA_Array_copy(const void *src, UA_Int32 noElements, const UA_TypeVTable *vt, void **dst);
#ifdef UA_DEBUG
void UA_EXPORT UA_Array_print(const void *p, UA_Int32 noElements, const UA_TypeVTable *vt, FILE *stream);
#endif

/**********/
/* VTable */
/**********/

typedef struct UA_Encoding {
    /**  Returns the size of the encoded element.*/
    UA_UInt32 (*calcSize)(const void *p);
    /** Encodes the type into the destination bytestring. */
    UA_StatusCode (*encode)(const void *src, UA_ByteString *dst, UA_UInt32 *offset);
    /** Decodes a ByteString into an UA datatype. */
    UA_StatusCode (*decode)(const UA_ByteString *src, UA_UInt32 *offset, void *dst);
} UA_Encoding;

#define UA_ENCODING_BINARY 0 // Binary encoding is always available

struct UA_TypeVTable {
    UA_NodeId     typeId;
    UA_Byte       *name;
    void *        (*new)(void);
    void          (*init)(void *p);
    UA_StatusCode (*copy)(void const *src, void *dst);
    void          (*delete)(void *p);
    void          (*deleteMembers)(void *p);
#ifdef UA_DEBUG
    void          (*print)(const void *p, FILE *stream);
#endif
    UA_UInt32  memSize;                        // size of the struct
    UA_Boolean dynMembers;                     // does the type contain members that are dynamically on the heap?
    UA_Encoding encodings[UA_ENCODING_AMOUNT]; // binary, xml, ... UA_ENCODING_AMOUNT is set by the build script
};

/** @} */

#ifdef __cplusplus
} // extern "C"
#endif

#endif /* UA_TYPES_H_ */