/*
 * bool_or.c
 *
 *  Created on: 20/11/2017
 *      Author: pedro
 */

#ifndef __OPENCL_VERSION__

#include <stddef.h>
#include <stdio.h>

#include "bool_or.h"

#include "../bitmaps.h"
#include "../config.h"
#include "../variables.h"

#endif

#include "../kernels/cl_aux_functions.h"
#if CL_D_TYPE == CL_BITMAP
#include "../kernels/cl_bitmaps.h"
#elif CL_D_TYPE == CL_INTERVAL
#include  "../kernels/cl_intervals.h"
#endif
#include "../kernels/cl_constraints.h"
#include "../kernels/cl_variables.h"
#include "../kernels/cl_ttl.h"

#ifndef __OPENCL_VERSION__

/*
 * Creates a new constraint of the type bool_or and return the constraint ID
 * (∃ i ∈ 1..n : X[i]) ↔ y
 * X_ids - vector with the ID of the boolean variables that may be assigned with 1 (true)
 * n_vs - maximum number of boolean variables in X vector
 * y - boolean variable whose assignment is the result of the binary OR between X variables
 */
unsigned int c_bool_or(unsigned int* X_ids, unsigned int n_vs, unsigned int y_id) {
	unsigned int i;

	for (i = 0; i < n_vs; i++) {
		if (VS[X_ids[i]].max > 1) {
			v_del_gt(&VS[X_ids[i]], 1);

			if (VS[X_ids[i]].n_vals == 0) {
				fprintf(stderr, "\nError: Constraint BOOL_OR makes model inconsistent at creation:\n");
				exit(-1);
			}
		}
	}

	// set to include in kernel compilation
	USE_CS[BOOL_OR] = 1;
	USE_NON_CS_REIFI[BOOL_OR] = 1;
	REV = 1;

	unsigned int* c_vs = malloc((n_vs + 1) * sizeof(unsigned int));

	for (i = 0; i < n_vs; i++) {
		c_vs[i] = X_ids[i];
	}
	c_vs[i] = y_id;

	// creates a new generic constraint
	unsigned int c_id = c_new(c_vs, n_vs + 1, NULL, 0, -1);

	// pointers to this type of constraint functions
	CS[c_id].kind = BOOL_OR;
	CS[c_id].check_sol_f = &bool_or_check;
	CS[c_id].constant_val = 0;

	free(c_vs);

	return c_id;
}

/*
 * Creates a new reified constraint of the bool_or type
 * (∃ i ∈ 1..n : X[i]) ↔ y
 * X_ids - vector with the ID of the boolean variables that may be assigned with 1 (true)
 * n_vs - maximum number of boolean variables in X vector
 * y - boolean variable whose assignment must be equal to all the X variables
 * reif_v_id - ID of the reification variable
 */
unsigned int c_bool_or_reif(unsigned int* X_ids, unsigned int n_vs, unsigned int y_id, int reif_v_id) {
	unsigned int i;

	if (VS[reif_v_id].max > 1) {
		v_del_gt(&VS[reif_v_id], 1);

		if (VS[reif_v_id].n_vals == 0) {
			fprintf(stderr, "\nError: Constraint BOOL_OR_REIF makes model inconsistent at creation:\n");
			exit(-1);
		}
	}

	for (i = 0; i < n_vs; i++) {
		if (VS[X_ids[i]].max > 1) {
			v_del_gt(&VS[X_ids[i]], 1);

			if (VS[X_ids[i]].n_vals == 0) {
				fprintf(stderr, "\nError: Constraint BOOL_OR_REIF makes model inconsistent at creation:\n");
				exit(-1);
			}
		}
	}

	// set to include in kernel compilation
	USE_CS[BOOL_OR] = 1;
	USE_CS_REIFI[BOOL_OR] = 1;
	REV = 1;

	unsigned int* c_vs = malloc((n_vs + 1) * sizeof(unsigned int));

	for (i = 0; i < n_vs; i++) {
		c_vs[i] = X_ids[i];
	}
	c_vs[i] = y_id;

	// creates a new generic constraint
	unsigned int c_id = c_new(c_vs, n_vs + 1, NULL, 0, reif_v_id);

	// pointers to this type of constraint functions
	CS[c_id].kind = BOOL_OR;
	CS[c_id].check_sol_f = &bool_or_check;
	CS[c_id].constant_val = 0;

	free(c_vs);

	return c_id;
}

/*
 * Return true if the bool_or constraint is respected or false if not
 * (∃ i ∈ 1..n : X[i]) ↔ y
 * c - constraint to check if is respected
 * explored - if the CSP was already explored, which mean that all the variables must already be singletons
 * */
bool bool_or_check(constr* c, bool explored) {
	var** X = c->c_vs;
	var* y = c->c_vs[c->n_c_vs - 1];
	int ones_ctr = 0;
	int i;

#if CHECK_SOL_N_VALS
	if (y->to_label && y->n_vals != 1) {

		if (explored) {
			fprintf(stderr, "\nError: Constraint BOOL_OR (%d) not respected:\n", c->c_id);

			for (i = 0; i < c->n_c_vs; i++) {
				fprintf(stderr, "Variable ID=%u -> minimum=%u, maximum=%u, number of values=%u\n\n", c->c_vs[i]->v_id, b_get_min_val(&c->c_vs[i]->domain_b),
						b_get_max_val(&c->c_vs[i]->domain_b),
						b_cnt_vals(&c->c_vs[i]->domain_b));
			}
		}
		return false;
	}
#endif

	for (i = 0; i < c->n_c_vs - 1; i++) {

#if CHECK_SOL_N_VALS
		if (X[i]->to_label && X[i]->n_vals != 1) {

			if (explored) {
				fprintf(stderr, "\nError: Constraint BOOL_OR (%d) not respected:\n", c->c_id);

				for (i = 0; i < c->n_c_vs; i++) {
					fprintf(stderr, "Variable ID=%u -> minimum=%u, maximum=%u, number of values=%u\n\n", c->c_vs[i]->v_id, b_get_min_val(&c->c_vs[i]->domain_b),
							b_get_max_val(&c->c_vs[i]->domain_b),
							b_cnt_vals(&c->c_vs[i]->domain_b));
				}
			}
			return false;
		}
#endif

		if (X[i]->min == 1) {
			ones_ctr++;
		}
	}

	if (y->min == 1 && ones_ctr == 0) {

		if (explored) {
			fprintf(stderr, "\nError: Constraint BOOL_OR (%d) not respected:\n", c->c_id);

			for (i = 0; i < c->n_c_vs; i++) {
				fprintf(stderr, "Variable ID=%u -> minimum=%u, maximum=%u, number of values=%u\n\n", c->c_vs[i]->v_id, b_get_min_val(&c->c_vs[i]->domain_b),
						b_get_max_val(&c->c_vs[i]->domain_b),
						b_cnt_vals(&c->c_vs[i]->domain_b));
			}
		}
		return false;
	}
	return true;
}

#endif

#if CS_BOOL_OR == 1
/*
 * Propagate the domain of the variable with the ID prop_v_id through all the other variables on the same c_numb ID bool_or constraint
 * (∃ i ∈ 1..n : X[i]) ↔ y
 * prop_ok will be set to 1 if success or to 0 if any domain became empty
 * vs_per_c_idx - vector with all constrained variables ID per constraint, per constraint ID order
 * vs_prop_ - all CSP variables with current step values
 * prop_v_id - variable ID to propagate
 * current_cs - constraint that should be propagated for the variable with prop_v_id ID
 * vs_id_to_prop_ - circular vector with the ids of the variables to propagate
 */
CUDA_FUNC void bool_or_prop(CL_INTS_MEM int* vs_per_c_idx, CL_MEMORY VARS_PROP* vs_prop_, CL_CS_MEM cl_constr* current_cs, CL_MEMORY unsigned short* vs_id_to_prop_,
		bool* prop_ok CS_IGNORE_FUNC TTL_CTR) {

	int y_id = vs_per_c_idx[current_cs->n_c_vs - 1];
	int x_id;
	bool ones = false;
	bool all_singl = true;
	int not_singl = 0;
	int not_singl_id;
	bool changed;
	int i;

	for (i = 0; i < current_cs->n_c_vs - 1; i++) {
		x_id = vs_per_c_idx[i];

		if (V_N_VALS(vs_prop_[x_id]) == 1 && V_MIN(vs_prop_[x_id]) == 1) {
			ones = true;
			break;

		} else if (V_N_VALS(vs_prop_[x_id]) > 1) {
			all_singl = false;
			not_singl++;
			not_singl_id = x_id;
		}
	}

	// if any X is already set to 1
	if (ones) {
		cl_v_del_all_except_val_m(&changed, &vs_prop_[y_id], 1 TTL_CTR_V);
		if (changed) {
			if (V_IS_EMPTY(vs_prop_[y_id]) ) {
				*prop_ok = 0;
				return;
			}
			v_add_to_prop(vs_id_to_prop_, vs_prop_, y_id);
		}

#if CL_CS_IGNORE
		cs_ignore[current_cs->c_id] = 1;
#endif

	// if all the X are set to 0
	} else if (all_singl) {
		cl_v_del_all_except_val_m(&changed, &vs_prop_[y_id], 0 TTL_CTR_V);
		if (changed) {
			if (V_IS_EMPTY(vs_prop_[y_id])) {
				*prop_ok = 0;
				return;
			}
			v_add_to_prop(vs_id_to_prop_, vs_prop_, y_id);
		}

#if CL_CS_IGNORE
		cs_ignore[current_cs->c_id] = 1;
#endif

	} else if (V_N_VALS(vs_prop_[y_id]) == 1) {

		// y is 1 and only one x is not singleton and all the others are 0
		if (V_MIN(vs_prop_[y_id]) == 1) {

			if (not_singl == 1) {
				cl_v_bool_del_val_m(&vs_prop_[not_singl_id], 0 TTL_CTR_V);
				v_add_to_prop(vs_id_to_prop_, vs_prop_, not_singl_id);

#if CL_CS_IGNORE
				cs_ignore[current_cs->c_id] = 1;
#endif
			}

			// y is 0, set all x to 0
		} else {
			for (i = 0; i < current_cs->n_c_vs - 1; i++) {
				x_id = vs_per_c_idx[i];

				if (V_N_VALS(vs_prop_[x_id]) > 1) {
					cl_v_bool_del_val_m(&vs_prop_[x_id], 1 TTL_CTR_V);
					v_add_to_prop(vs_id_to_prop_, vs_prop_, x_id);
				}
			}
#if CL_CS_IGNORE
			cs_ignore[current_cs->c_id] = 1;
#endif
		}
	}
}

#if CS_R_BOOL_OR == 1
/*
 * Validate bool_or constraint to be normally propagated, when reified
 * (∃ i ∈ 1..n : X[i]) ↔ y
 * vs_per_c_idx - vector with all constrained variables ID per constraint, per constraint ID order
 * vs_prop_ - all CSP variables with current step values
 * current_cs - constraint that should be propagated for the variable with prop_v_id ID
 * vs_id_to_prop_ - circular vector with the ids of the variables to propagate
 */
CUDA_FUNC void bool_or_reif( CL_INTS_MEM int* vs_per_c_idx, CL_MEMORY VARS_PROP* vs_prop_, CL_CS_MEM cl_constr* current_cs, CL_MEMORY unsigned short* vs_id_to_prop_
		CS_IGNORE_FUNC TTL_CTR) {

	int y_id = vs_per_c_idx[current_cs->n_c_vs - 1];
	int x_id;
	bool ones = false;
	int i;

	// y has 1 value
	if (V_N_VALS(vs_prop_[y_id]) == 1) {

		for (i = 0; i < current_cs->n_c_vs - 1; i++) {
			x_id = vs_per_c_idx[i];

			if (V_N_VALS(vs_prop_[x_id]) == 1 && V_MIN(vs_prop_[x_id]) == 1) {
				ones = true;
			}
		}

		// at least one x is 1
		if (ones) {

			if (V_MIN(vs_prop_[y_id]) == 1) {
				cl_v_bool_del_val_m(&vs_prop_[current_cs->reif_var_id], 0 TTL_CTR_V);
				v_add_to_prop(vs_id_to_prop_, vs_prop_, convert_int(current_cs->reif_var_id));

			} else {
				cl_v_bool_del_val_m(&vs_prop_[current_cs->reif_var_id], 1 TTL_CTR_V);
				v_add_to_prop(vs_id_to_prop_, vs_prop_, convert_int(current_cs->reif_var_id));
			}

#if CL_CS_IGNORE
			cs_ignore[current_cs->c_id] = 1;
#endif
		}
	}
}

/*
 * Propagate the domain of the variable with the ID prop_v_id through all the other variables on the same c_numb ID bool_or opposite constraint
 * (∃ i !∈ 1..n : X[i]) ↔ y
 * vs_per_c_idx - vector with all constrained variables ID per constraint, per constraint ID order
 * vs_prop_ - all CSP variables with current step values
 * prop_v_id - variable ID to propagate
 * current_cs - constraint that should be propagated for the variable with prop_v_id ID
 * vs_id_to_prop_ - circular vector with the ids of the variables to propagate
 */
CUDA_FUNC void bool_or_prop_opposite(CL_INTS_MEM int* vs_per_c_idx, CL_MEMORY VARS_PROP* vs_prop_, CL_CS_MEM cl_constr* current_cs, CL_MEMORY unsigned short* vs_id_to_prop_,
		bool* prop_ok CS_IGNORE_FUNC TTL_CTR) {

	int y_id = vs_per_c_idx[current_cs->n_c_vs - 1];
	int x_id;
	bool ones = false;
	bool all_singl = true;
	bool changed;
	int i;

	for (i = 0; i < current_cs->n_c_vs - 1; i++) {
		x_id = vs_per_c_idx[i];

		if (V_N_VALS(vs_prop_[x_id]) == 1 && V_MIN(vs_prop_[x_id]) == 1) {
			ones = true;
		} else if (V_N_VALS(vs_prop_[x_id]) > 1) {
			all_singl = false;
		}
	}

	// if any X is already set to 1
	if (ones) {
		cl_v_del_val_m(&changed, &vs_prop_[y_id], 1 TTL_CTR_V);
		if (changed) {
			if (V_IS_EMPTY(vs_prop_[y_id]) ) {
				*prop_ok = 0;
				return;
			}
			v_add_to_prop(vs_id_to_prop_, vs_prop_, y_id);
		}

#if CL_CS_IGNORE
		cs_ignore[current_cs->c_id] = 1;
#endif

	// if all the X are set to 0
	} else if (!ones && all_singl) {
		cl_v_del_val_m(&changed, &vs_prop_[y_id], 0 TTL_CTR_V);
		if (changed) {
			if (V_IS_EMPTY(vs_prop_[y_id])) {
				*prop_ok = 0;
				return;
			}
			v_add_to_prop(vs_id_to_prop_, vs_prop_, y_id);
		}

#if CL_CS_IGNORE
		cs_ignore[current_cs->c_id] = 1;
#endif
	}
}

#endif

CUDA_FUNC void bool_or_propagate(CL_INTS_MEM int* vs_per_c_idx, CL_MEMORY VARS_PROP* vs_prop_, CL_CS_MEM cl_constr* current_cs, CL_MEMORY unsigned short* vs_id_to_prop_,
		bool* prop_ok PROPAGATED_FUNC CS_IGNORE_FUNC TTL_CTR) {

#if CS_R_BOOL_OR == 0
	bool_or_prop(vs_per_c_idx, vs_prop_, current_cs, vs_id_to_prop_, prop_ok CS_IGNORE_CALL TTL_CTR_V);
#if CL_STATS == 1
	*propagated = true;
#endif

#elif CS_R_BOOL_OR == 1
	if (current_cs->reified == 1) {
		if (V_N_VALS(vs_prop_[current_cs->reif_var_id]) > 1) {
			bool_or_reif(vs_per_c_idx, vs_prop_, current_cs, vs_id_to_prop_ CS_IGNORE_CALL TTL_CTR_V);

		} else {
			if (V_MIN(vs_prop_[current_cs->reif_var_id]) == 1) {
				bool_or_prop(vs_per_c_idx, vs_prop_, current_cs, vs_id_to_prop_, prop_ok CS_IGNORE_CALL TTL_CTR_V);
			} else {
				bool_or_prop_opposite(vs_per_c_idx, vs_prop_, current_cs, vs_id_to_prop_, prop_ok CS_IGNORE_CALL TTL_CTR_V);
			}
#if CL_STATS == 1
			*propagated = true;
#endif
		}
	} else {
		bool_or_prop(vs_per_c_idx, vs_prop_, current_cs, vs_id_to_prop_, prop_ok CS_IGNORE_CALL TTL_CTR_V);
#if CL_STATS == 1
		*propagated = true;
#endif
	}
#endif
}

#endif