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/*******************************************************************************
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 * This file is part of SWIFT.
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 * Copyright (c) 2012 Pedro Gonnet (pedro.gonnet@durham.ac.uk)
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 *                    Matthieu Schaller (matthieu.schaller@durham.ac.uk)
 *               2015 Peter W. Draper (p.w.draper@durham.ac.uk)
 *                    Angus Lepper (angus.lepper@ed.ac.uk)
 *               2016 John A. Regan (john.a.regan@durham.ac.uk)
 *                    Tom Theuns (tom.theuns@durham.ac.uk)
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 *
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 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Lesser General Public License as published
 * by the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
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 *
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 * This program 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 General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
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 *
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 ******************************************************************************/
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#ifndef SWIFT_ENGINE_H
#define SWIFT_ENGINE_H
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/* Config parameters. */
#include "../config.h"

/* MPI headers. */
#ifdef WITH_MPI
#include <mpi.h>
#endif

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/* Includes. */
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#include "barrier.h"
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#include "chemistry_struct.h"
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#include "clocks.h"
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#include "collectgroup.h"
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#include "cooling_struct.h"
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#include "gravity_properties.h"
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#include "mesh_gravity.h"
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#include "parser.h"
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#include "partition.h"
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#include "potential.h"
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#include "runner.h"
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#include "scheduler.h"
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#include "sourceterms_struct.h"
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#include "space.h"
#include "task.h"
#include "units.h"
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/**
 * @brief The different policies the #engine can follow.
 */
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enum engine_policy {
  engine_policy_none = 0,
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  engine_policy_rand = (1 << 0),
  engine_policy_steal = (1 << 1),
  engine_policy_keep = (1 << 2),
  engine_policy_block = (1 << 3),
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  engine_policy_cputight = (1 << 4),
  engine_policy_mpi = (1 << 5),
  engine_policy_setaffinity = (1 << 6),
  engine_policy_hydro = (1 << 7),
  engine_policy_self_gravity = (1 << 8),
  engine_policy_external_gravity = (1 << 9),
  engine_policy_cosmology = (1 << 10),
  engine_policy_drift_all = (1 << 11),
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  engine_policy_reconstruct_mpoles = (1 << 12),
  engine_policy_cooling = (1 << 13),
  engine_policy_sourceterms = (1 << 14),
  engine_policy_stars = (1 << 15)
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};
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#define engine_maxpolicy 15
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extern const char *engine_policy_names[];
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/**
 * @brief The different unusual events that can take place in a time-step.
 */
enum engine_step_properties {
  engine_step_prop_none = 0,
  engine_step_prop_rebuild = (1 << 0),
  engine_step_prop_redistribute = (1 << 1),
  engine_step_prop_repartition = (1 << 2),
  engine_step_prop_statistics = (1 << 3),
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  engine_step_prop_snapshot = (1 << 4),
  engine_step_prop_restarts = (1 << 5)
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};

/* Some constants */
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#define engine_maxproxies 64
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#define engine_tasksreweight 1
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#define engine_parts_size_grow 1.05
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#define engine_redistribute_alloc_margin 1.2
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#define engine_default_energy_file_name "energy"
#define engine_default_timesteps_file_name "timesteps"
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#define engine_max_parts_per_ghost 1000
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/* MPI task tags. */
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enum engine_task_tags {
  engine_task_tag_xv = 0,
  engine_task_tag_rho,
  engine_task_tag_ti,
  engine_task_tag_grad,
  engine_task_tag_grav,
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  engine_tasks_per_tag
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};
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/**
 * @brief The rank of the engine as a global variable (for messages).
 */
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extern int engine_rank;

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/* Data structure for the engine. */
struct engine {

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  /* Number of threads on which to run. */
  int nr_threads;

  /* The space with which the runner is associated. */
  struct space *s;

  /* The runner's threads. */
  struct runner *runners;

  /* The running policy. */
  int policy;

  /* The task scheduler. */
  struct scheduler sched;

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  /* Common threadpool for all the engine's tasks. */
  struct threadpool threadpool;

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  /* The minimum and maximum allowed dt */
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  double dt_min, dt_max;
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  /* Maximum time-step allowed by the RMS condition in cosmology runs. */
  double dt_max_RMS_displacement;

  /* Dimensionless factor for the RMS time-step condition. */
  double max_RMS_displacement_factor;

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  /* Time of the simulation beginning */
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  double time_begin;
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  /* Time of the simulation end */
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  double time_end;
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  /* The previous system time. */
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  double time_old;
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  integertime_t ti_old;
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  /* The current system time. */
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  double time;
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  integertime_t ti_current;
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  /* The highest active bin at this time */
  timebin_t max_active_bin;

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  /* The lowest active bin at this time */
  timebin_t min_active_bin;

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  /* Time step */
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  double time_step;
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  /* Time base */
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  double time_base;
  double time_base_inv;
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  /* Minimal hydro ti_end for the next time-step */
  integertime_t ti_hydro_end_min;

  /* Maximal hydro ti_end for the next time-step */
  integertime_t ti_hydro_end_max;

  /* Maximal hydro ti_beg for the next time-step */
  integertime_t ti_hydro_beg_max;

  /* Minimal gravity ti_end for the next time-step */
  integertime_t ti_gravity_end_min;

  /* Maximal gravity ti_end for the next time-step */
  integertime_t ti_gravity_end_max;

  /* Maximal gravity ti_beg for the next time-step */
  integertime_t ti_gravity_beg_max;

  /* Minimal overall ti_end for the next time-step */
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  integertime_t ti_end_min;
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  /* Maximal overall ti_end for the next time-step */
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  integertime_t ti_end_max;

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  /* Maximal overall ti_beg for the next time-step */
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  integertime_t ti_beg_max;

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  /* Number of particles updated in the previous step */
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  long long updates, g_updates, s_updates;
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  /* Number of updates since the last rebuild */
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  long long updates_since_rebuild;
  long long g_updates_since_rebuild;
  long long s_updates_since_rebuild;
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  /* Properties of the previous step */
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  int step_props;
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  /* Total numbers of particles in the system. */
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  long long total_nr_parts, total_nr_gparts, total_nr_sparts;
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  /* The internal system of units */
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  const struct unit_system *internal_units;
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  /* Snapshot information */
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  double a_first_snapshot;
  double time_first_snapshot;
  double delta_time_snapshot;

  /* Integer time of the next snapshot */
  integertime_t ti_next_snapshot;

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  char snapshot_base_name[PARSER_MAX_LINE_SIZE];
  int snapshot_compression;
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  int snapshot_label_delta;
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  struct unit_system *snapshot_units;
  int snapshot_output_count;
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  /* Statistics information */
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  double a_first_statistics;
  double time_first_statistics;
  double delta_time_statistics;

  /* Integer time of the next statistics dump */
  integertime_t ti_next_stats;

  /* File handle for the statistics */
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  FILE *file_stats;
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  /* File handle for the timesteps information */
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  FILE *file_timesteps;

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  /* The current step number. */
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  int step;
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  /* Data for the threads' barrier. */
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  swift_barrier_t wait_barrier;
  swift_barrier_t run_barrier;
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  /* ID of the node this engine lives on. */
  int nr_nodes, nodeID;

  /* Proxies for the other nodes in this simulation. */
  struct proxy *proxies;
  int nr_proxies, *proxy_ind;

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#ifdef SWIFT_DEBUG_TASKS
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  /* Tic/toc at the start/end of a step. */
  ticks tic_step, toc_step;
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#endif
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#ifdef WITH_MPI
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  /* CPU time of the last step. */
  double cputime_last_step;
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  /* Step of last repartition. */
  int last_repartition;
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#endif

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  /* Wallclock time of the last time-step */
  float wallclock_time;
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  /* Force the engine to rebuild? */
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  int forcerebuild;
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  /* Force the engine to repartition ? */
  int forcerepart;
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  struct repartition *reparttype;
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  /* Need to dump some statistics ? */
  int save_stats;

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  /* Need to dump a snapshot ? */
  int dump_snapshot;
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  /* How many steps have we done with the same set of tasks? */
  int tasks_age;

  /* Linked list for cell-task association. */
  struct link *links;
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  size_t nr_links, size_links;
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  /* Average number of tasks per cell. Used to estimate the sizes
   * of the various task arrays. */
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  size_t tasks_per_cell;
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  /* Are we talkative ? */
  int verbose;
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  /* Physical constants definition */
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  const struct phys_const *physical_constants;
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  /* The cosmological model */
  struct cosmology *cosmology;

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  /* Properties of the hydro scheme */
  const struct hydro_props *hydro_properties;

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  /* Properties of the self-gravity scheme */
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  struct gravity_props *gravity_properties;
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  /* The mesh used for long-range gravity forces */
  struct pm_mesh *mesh;

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  /* Properties of external gravitational potential */
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  const struct external_potential *external_potential;
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  /* Properties of the cooling scheme */
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  const struct cooling_function_data *cooling_func;
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  /* Properties of the chemistry model */
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  const struct chemistry_global_data *chemistry;
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  /* Properties of source terms */
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  struct sourceterms *sourceterms;
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  /* The (parsed) parameter file */
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  struct swift_params *parameter_file;
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  /* Temporary struct to hold a group of deferable properties (in MPI mode
   * these are reduced together, but may not be required just yet). */
  struct collectgroup1 collect_group1;
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  /* Whether to dump restart files. */
  int restart_dump;

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  /* Whether to save previous generation of restart files. */
  int restart_save;

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  /* Whether to dump restart files after the last step. */
  int restart_onexit;

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  /* Name of the restart file. */
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  const char *restart_file;
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  /* Ticks between restart dumps. */
  ticks restart_dt;

  /* Time after which next dump will occur. */
  ticks restart_next;
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  /* Maximum number of tasks needed for restarting. */
  int restart_max_tasks;
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};
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/* Function prototypes. */
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void engine_barrier(struct engine *e);
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void engine_compute_next_snapshot_time(struct engine *e);
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void engine_compute_next_statistics_time(struct engine *e);
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void engine_recompute_displacement_constraint(struct engine *e);
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void engine_unskip(struct engine *e);
void engine_drift_all(struct engine *e);
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void engine_drift_top_multipoles(struct engine *e);
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void engine_reconstruct_multipoles(struct engine *e);
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void engine_print_stats(struct engine *e);
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void engine_dump_snapshot(struct engine *e);
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void engine_init(struct engine *e, struct space *s, struct swift_params *params,
                 long long Ngas, long long Ngparts, long long Nstars,
                 int policy, int verbose, struct repartition *reparttype,
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                 const struct unit_system *internal_units,
                 const struct phys_const *physical_constants,
                 struct cosmology *cosmo, const struct hydro_props *hydro,
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                 struct gravity_props *gravity, struct pm_mesh *mesh,
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                 const struct external_potential *potential,
                 const struct cooling_function_data *cooling_func,
                 const struct chemistry_global_data *chemistry,
                 struct sourceterms *sourceterms);
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void engine_config(int restart, struct engine *e, struct swift_params *params,
                   int nr_nodes, int nodeID, int nr_threads, int with_aff,
                   int verbose, const char *restart_file);
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void engine_launch(struct engine *e);
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void engine_prepare(struct engine *e);
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void engine_init_particles(struct engine *e, int flag_entropy_ICs,
                           int clean_h_values);
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void engine_step(struct engine *e);
void engine_maketasks(struct engine *e);
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void engine_split(struct engine *e, struct partition *initial_partition);
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void engine_exchange_strays(struct engine *e, size_t offset_parts,
                            int *ind_part, size_t *Npart, size_t offset_gparts,
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                            int *ind_gpart, size_t *Ngpart,
                            size_t offset_sparts, int *ind_spart,
                            size_t *Nspart);
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void engine_rebuild(struct engine *e, int clean_h_values);
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void engine_repartition(struct engine *e);
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void engine_repartition_trigger(struct engine *e);
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void engine_makeproxies(struct engine *e);
void engine_redistribute(struct engine *e);
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void engine_print_policy(struct engine *e);
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int engine_is_done(struct engine *e);
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void engine_pin(void);
void engine_unpin(void);
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void engine_clean(struct engine *e);
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int engine_estimate_nr_tasks(struct engine *e);
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/* Struct dump/restore support. */
void engine_struct_dump(struct engine *e, FILE *stream);
void engine_struct_restore(struct engine *e, FILE *stream);
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void engine_dump_restarts(struct engine *e, int drifted_all, int final_step);
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#endif /* SWIFT_ENGINE_H */