<?php
namespace TensorFlow
{
    // extern const char* TF_Version();
    const VERSION;

    // typedef enum { ... } TF_DataType
    const DTYPE_FLOAT = 1;
    const DTYPE_DOUBLE = 2;
    const DTYPE_INT32 = 3;
    const DTYPE_UINT8 = 4;
    const DTYPE_INT16 = 5;
    const DTYPE_INT8 = 6;
    const DTYPE_STRING = 7;
    const DTYPE_COMPLEX64 = 8;
    const DTYPE_COMPLEX = 8;
    const DTYPE_INT64 = 9;
    const DTYPE_BOOL = 10;
    const DTYPE_QINT8 = 11;
    const DTYPE_QUINT8 = 12;
    const DTYPE_QINT32 = 13;
    const DTYPE_BFLOAT16 = 14;
    const DTYPE_QINT16 = 15;
    const DTYPE_QUINT16 = 16;
    const DTYPE_UINT16 = 17;
    const DTYPE_COMPLEX128 = 18;
    const DTYPE_HALF = 19;
    const DTYPE_RESOURCE = 20;

    // typedef struct TF_Status TF_Status;
    class Status
    {
        // typedef enum { ... } TF_Code;
        const CODE_OK = 0;
        const CODE_CANCELLED = 1;
        const CODE_UNKNOWN = 2;
        const CODE_INVALID_ARGUMENT = 3;
        const CODE_DEADLINE_EXCEEDED = 4;
        const CODE_NOT_FOUND = 5;
        const CODE_ALREADY_EXISTS = 6;
        const CODE_PERMISSION_DENIED = 7 ;
        const CODE_RESOURCE_EXHAUSTED = 8;
        const CODE_FAILED_PRECONDITION = 9;
        const CODE_ABORTED = 10;
        const CODE_OUT_OF_RANGE = 11;
        const CODE_UNIMPLEMENTED = 12;
        const CODE_INTERNAL = 13;
        const CODE_UNAVAILABLE = 14;
        const CODE_DATA_LOSS = 15;
        const CODE_UNAUTHENTICATED = 16;

        // extern TF_Status* TF_NewStatus();
        public function __construct();

        // extern void TF_DeleteStatus(TF_Status*);
        public function __destruct();

        // extern void TF_SetStatus(TF_Status* s, TF_Code code, const char* msg);
        public function setCode(int $code, string $message = ""): void;

        // extern TF_Code TF_GetCode(const TF_Status* s);
        public function getCode(): int;

        // extern const char* TF_Message(const TF_Status* s);
        public function getMessage(): string;
    }

    /*
     * typedef struct {
     *   const void* data;
     *   size_t length;
     *   void (*data_deallocator)(void* data, size_t length);
     * } TF_Buffer;
     */
    class Buffer
    {
        // extern TF_Buffer* TF_NewBufferFromString(const void* proto, size_t proto_len);
        // extern TF_Buffer* TF_NewBuffer();
        public function __construct(string $buffer = null);

        // extern void TF_DeleteBuffer(TF_Buffer*);
        public function __destruct();

        // extern TF_Buffer TF_GetBuffer(TF_Buffer* buffer);
        // return TF_GetBuffer( ... ).data
        public function __toString(): string;
    }

    // typedef struct TF_Tensor TF_Tensor;
    class Tensor
    {
        // extern TF_Tensor* TF_AllocateTensor(TF_DataType, const int64_t* dims,
        //                                     int num_dims, size_t len);
        public function __construct(int $dtype, array $dims = null);

        // extern void TF_DeleteTensor(TF_Tensor*);
        public function __destruct();

        // extern TF_DataType TF_TensorType(const TF_Tensor*);
        public function getDtype(): int;
    }

    // typedef struct TF_SessionOptions TF_SessionOptions;
    class SessionOptions
    {
        // extern TF_SessionOptions* TF_NewSessionOptions();
        public function __construct();

        // extern void TF_DeleteSessionOptions(TF_SessionOptions*);
        public function __destruct();

        /**
         * extern void TF_SetTarget(TF_SessionOptions* options, const char* target);
         * @param string $target "local", ip:port or host:port
         */
        public function setTarget(string $target);
    }

    // typedef struct TF_Graph TF_Graph;
    class Graph
    {
        /**
         * extern TF_Graph* TF_NewGraph();
         */
        public function __construct();

        /**
         * extern void TF_DeleteGraph(TF_Graph*);
         */
        public function __destruct();
    }

    // typedef struct TF_OperationDescription TF_OperationDescription;
    class OperationDescription
    {
        /**
         * extern TF_OperationDescription* TF_NewOperation(TF_Graph* graph,
         *                                                 const char* op_type,
         *                                                 const char* oper_name);
         *
         * @param Graph $graph
         * @param string $operationType "Const"
         * @param string $operationName
         */
        public function __construct(Graph $graph, string $operationType, string $operationName);

        /**
         * extern void TF_SetDevice(TF_OperationDescription* desc, const char* device);
         */
        public function setDevice(string $device);

        /**
         * extern void TF_SetAttrInt(TF_OperationDescription* desc, const char* attr_name,
         *                           int64_t value);
         */
        public function setAttrInt(string $name, int $value);

        /**
         * extern void TF_SetAttrIntList(TF_OperationDescription* desc,
         *                               const char* attr_name, const int64_t* values,
         *                               int num_values);
         */
        public function setAttrIntList(string $name, int[] $values);

        /**
         * extern void TF_SetAttrFloat(TF_OperationDescription* desc,
         *                             const char* attr_name, float value);
         */
        public function setAttrFloat(string $name, float $value);

        /**
         * extern void TF_SetAttrFloatList(TF_OperationDescription* desc,
         *                                 const char* attr_name, const float* values,
         *                                 int num_values);
         */
        public function setAttrFloatList(string $name, float[] $values);

        /**
         * extern void TF_SetAttrBool(TF_OperationDescription* desc, const char* attr_name,
         *                            unsigned char value);
         */
        public function setAttrBool(string $name, bool $value);

        /**
         * extern void TF_SetAttrBoolList(TF_OperationDescription* desc,
         *                                const char* attr_name,
         *                                const unsigned char* values, int num_values);
         */
        public function setAttrBoolList(string $name, bool[] $values);

        /**
         * extern void TF_SetAttrType(TF_OperationDescription* desc, const char* attr_name,
         *                            TF_DataType value);
         */
        public function setAttrType(string $name, int $dtype);

        /**
         * extern void TF_SetAttrTypeList(TF_OperationDescription* desc,
         *                                const char* attr_name, const TF_DataType* values,
         *                                int num_values);
         */
        public function setAttrTypeList(string $name, int[] $dtypes);
    }
}