// Copyright 2021 DeepMind Technologies Limited
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#ifndef MUJOCO_SRC_ENGINE_ENGINE_IO_H_
#define MUJOCO_SRC_ENGINE_ENGINE_IO_H_

#include <mujoco/mjdata.h>
#include <mujoco/mjexport.h>
#include <mujoco/mjmodel.h>

#ifdef __cplusplus
#include <cstddef>
extern "C" {
#else
#include <stddef.h>
#endif

// internal hash map size factor (2 corresponds to a load factor of 0.5)
#define mjLOAD_MULTIPLE 2

//------------------------------- initialization ---------------------------------------------------

// Set default options for length range computation.
MJAPI void mj_defaultLROpt(mjLROpt* opt);

// set options to default values
MJAPI void mj_defaultOption(mjOption* opt);

// set visual options to default values
MJAPI void mj_defaultVisual(mjVisual* vis);

// set statistics to default values; compute later in compiler
void mj_defaultStatistic(mjStatistic* stat);


//------------------------------- mjModel ----------------------------------------------------------

// allocate mjModel
void mj_makeModel(mjModel** dest,
    mjtSize nq, mjtSize nv, mjtSize nu, mjtSize na, mjtSize nbody, mjtSize nbvh, mjtSize nbvhstatic,
    mjtSize nbvhdynamic, mjtSize noct, mjtSize njnt, mjtSize ntree, mjtSize nM, mjtSize nB,
    mjtSize nC, mjtSize nD, mjtSize ngeom, mjtSize nsite, mjtSize ncam, mjtSize nlight,
    mjtSize nflex, mjtSize nflexnode, mjtSize nflexvert, mjtSize nflexedge, mjtSize nflexelem,
    mjtSize nflexelemdata, mjtSize nflexstiffness, mjtSize nflexbending, mjtSize nflexelemedge,
    mjtSize nflexshelldata, mjtSize nflexevpair, mjtSize nflextexcoord, mjtSize nJfe, mjtSize nJfv,
    mjtSize nmesh, mjtSize nmeshvert, mjtSize nmeshnormal, mjtSize nmeshtexcoord, mjtSize nmeshface,
    mjtSize nmeshgraph, mjtSize nmeshpoly, mjtSize nmeshpolyvert, mjtSize nmeshpolymap,
    mjtSize nskin, mjtSize nskinvert, mjtSize nskintexvert, mjtSize nskinface, mjtSize nskinbone,
    mjtSize nskinbonevert, mjtSize nhfield, mjtSize nhfielddata, mjtSize ntex, mjtSize ntexdata,
    mjtSize nmat, mjtSize npair, mjtSize nexclude, mjtSize neq, mjtSize ntendon, mjtSize nJten,
    mjtSize nwrap, mjtSize nsensor, mjtSize nnumeric, mjtSize nnumericdata, mjtSize ntext,
    mjtSize ntextdata, mjtSize ntuple, mjtSize ntupledata, mjtSize nkey, mjtSize nmocap,
    mjtSize nplugin, mjtSize npluginattr, mjtSize nuser_body, mjtSize nuser_jnt, mjtSize nuser_geom,
    mjtSize nuser_site, mjtSize nuser_cam, mjtSize nuser_tendon, mjtSize nuser_actuator,
    mjtSize nuser_sensor, mjtSize nnames, mjtSize npaths);

// copy mjModel; allocate new if dest is NULL
MJAPI mjModel* mj_copyModel(mjModel* dest, const mjModel* src);

// copy mjModel, skip large arrays not required for abstract visualization
MJAPI void mjv_copyModel(mjModel* dest, const mjModel* src);

// save model to binary file
MJAPI void mj_saveModel(const mjModel* m, const char* filename, void* buffer, int buffer_sz);

// load model from binary buffer
MJAPI mjModel* mj_loadModelBuffer(const void* buffer, int buffer_sz);

// deallocate model
MJAPI void mj_deleteModel(mjModel* m);

// size of buffer needed to hold model
MJAPI mjtSize mj_sizeModel(const mjModel* m);

// validate reference fields in a model; return null if valid, error message otherwise
MJAPI const char* mj_validateReferences(const mjModel* m);

// construct sparse representation of dof-dof matrix
MJAPI void mj_makeDofDofSparse(int nv, int nC, int nD, int nM,
                               const int* dof_parentid, const int* dof_simplenum,
                               int* rownnz, int* rowadr, int* diag, int* colind,
                               int reduced, int upper, int* remaining);

// construct sparse representation of body-dof matrix
MJAPI void mj_makeBSparse(int nv, int nbody, int nB,
                          const int* body_dofnum, const int* body_parentid, const int* body_dofadr,
                          int* B_rownnz, int* B_rowadr, int* B_colind,
                          int* count);

// construct index mappings between M <-> D, M (legacy) -> M (CSR)
MJAPI void mj_makeDofDofMaps(int nv, int nM, int nC, int nD,
                             const int* dof_Madr, const int* dof_simplenum, const int* dof_parentid,
                             const int* D_rownnz, const int* D_rowadr, const int* D_colind,
                             const int* M_rownnz, const int* M_rowadr, const int* M_colind,
                             int* mapM2D, int* mapD2M, int* mapM2M,
                             int* M, int* scratch);

//------------------------------- mjData -----------------------------------------------------------

// allocate mjData corresponding to given model, initialize plugins, reset the state
// if the model buffer is unallocated the initial configuration will not be set
MJAPI mjData* mj_makeData(const mjModel* m);

// allocate mjData corresponding to given model, used internally
MJAPI void mj_makeRawData(mjData** dest, const mjModel* m);

// Copy mjData.
// m is only required to contain the size fields from MJMODEL_INTS.
MJAPI mjData* mj_copyData(mjData* dest, const mjModel* m, const mjData* src);

// copy mjData, skip large arrays not required for abstract visualization
MJAPI mjData* mjv_copyData(mjData* dest, const mjModel* m, const mjData* src);

// set data to defaults
MJAPI void mj_resetData(const mjModel* m, mjData* d);

// set data to defaults, fill everything else with debug_value
MJAPI void mj_resetDataDebug(const mjModel* m, mjData* d, unsigned char debug_value);

// Reset data. If 0 <= key < nkey, set fields from specified keyframe.
MJAPI void mj_resetDataKeyframe(const mjModel* m, mjData* d, int key);

// init plugins
MJAPI void mj_initPlugin(const mjModel* m, mjData* d);

// deallocate data
MJAPI void mj_deleteData(mjData* d);

#ifdef __cplusplus
}
#endif

#endif  // MUJOCO_SRC_ENGINE_ENGINE_IO_H_